@fluidframework/driver-utils - npm Package Compare versions

Comparing version 2.100.0 to 2.101.0

CHANGELOG.md

 # @fluidframework/driver-utils
 
+## 2.101.0
+
+Dependency updates only.
+
 ## 2.100.0
@@ -4,0 +8,0 @@

dist/packageVersion.d.ts

@@ -8,3 +8,3 @@ /*!
 export declare const pkgName = "@fluidframework/driver-utils";
-export declare const pkgVersion = "2.100.0";
+export declare const pkgVersion = "2.101.0";
 //# sourceMappingURL=packageVersion.d.ts.map

dist/packageVersion.js

@@ -11,3 +11,3 @@ "use strict";
 exports.pkgName = "@fluidframework/driver-utils";
-exports.pkgVersion = "2.100.0";
+exports.pkgVersion = "2.101.0";
 //# sourceMappingURL=packageVersion.js.map

dist/packageVersion.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"packageVersion.js","sourceRoot":"","sources":["../src/packageVersion.ts"],"names":[],"mappings":";AAAA;;;;;GAKG;;;AAEU,QAAA,OAAO,GAAG,8BAA8B,CAAC;AACzC,QAAA,UAAU,GAAG,SAAS,CAAC","sourcesContent":["/*!\n * Copyright (c) Microsoft Corporation and contributors. All rights reserved.\n * Licensed under the MIT License.\n *\n * THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY\n */\n\nexport const pkgName = \"@fluidframework/driver-utils\";\nexport const pkgVersion = \"2.100.0\";\n"]}
+{"version":3,"file":"packageVersion.js","sourceRoot":"","sources":["../src/packageVersion.ts"],"names":[],"mappings":";AAAA;;;;;GAKG;;;AAEU,QAAA,OAAO,GAAG,8BAA8B,CAAC;AACzC,QAAA,UAAU,GAAG,SAAS,CAAC","sourcesContent":["/*!\n * Copyright (c) Microsoft Corporation and contributors. All rights reserved.\n * Licensed under the MIT License.\n *\n * THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY\n */\n\nexport const pkgName = \"@fluidframework/driver-utils\";\nexport const pkgVersion = \"2.101.0\";\n"]}

dist/parallelRequests.d.ts.map

@@ -1,1 +0,1 @@
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+{"version":3,"file":"parallelRequests.d.ts","sourceRoot":"","sources":["../src/parallelRequests.ts"],"names":[],"mappings":"AAAA;;;GAGG;AAGH,OAAO,KAAK,EAAE,wBAAwB,EAAE,MAAM,iCAAiC,CAAC;AAGhF,OAAO,KAAK,EACX,kBAAkB,EAClB,OAAO,EACP,aAAa,EACb,yBAAyB,EACzB,MAAM,6CAA6C,CAAC;AACrD,OAAO,KAAK,EAAE,kBAAkB,EAAE,MAAM,0CAA0C,CAAC;AAkBnF;;;;;;;;;;;;GAYG;AACH,qBAAa,gBAAgB,CAAC,CAAC;IAmB7B,OAAO,CAAC,EAAE;IACV,OAAO,CAAC,QAAQ,CAAC,WAAW;IAC5B,OAAO,CAAC,QAAQ,CAAC,MAAM;IACvB,OAAO,CAAC,QAAQ,CAAC,eAAe;IAOhC,OAAO,CAAC,QAAQ,CAAC,gBAAgB;IA5BlC,OAAO,CAAC,eAAe,CAAS;IAChC,OAAO,CAAC,aAAa,CAAS;IAC9B,OAAO,CAAC,QAAQ,CAAC,OAAO,CAA0B;IAClD,OAAO,CAAC,YAAY,CAA2B;IAC/C,OAAO,CAAC,gBAAgB,CAAK;IAC7B,OAAO,CAAC,QAAQ,CAAC,QAAQ,CAAwB;IACjD,OAAO,CAAC,QAAQ,CAAK;IACrB,OAAO,CAAC,QAAQ,CAAC,MAAM,CAAU;IAEjC,OAAO,KAAK,OAAO,GAElB;IACD,IAAW,QAAQ,IAAI,OAAO,CAE7B;gBAGA,IAAI,EAAE,MAAM,EACJ,EAAE,EAAE,MAAM,GAAG,SAAS,EACb,WAAW,EAAE,MAAM,EACnB,MAAM,EAAE,kBAAkB,EAC1B,eAAe,EAAE,CACjC,OAAO,EAAE,MAAM,EACf,IAAI,EAAE,MAAM,EACZ,EAAE,EAAE,MAAM,EACV,QAAQ,EAAE,OAAO,EACjB,KAAK,EAAE,wBAAwB,KAC3B,OAAO,CAAC;QAAE,OAAO,EAAE,OAAO,CAAC;QAAC,MAAM,EAAE,OAAO,CAAC;QAAC,OAAO,EAAE,CAAC,EAAE,CAAA;KAAE,CAAC,EAChD,gBAAgB,EAAE,CAAC,OAAO,EAAE,CAAC,EAAE,KAAK,IAAI;IAOnD,MAAM,IAAI,IAAI;IAOR,GAAG,CAAC,WAAW,EAAE,MAAM,GAAG,OAAO,CAAC,IAAI,CAAC;IAapD,OAAO,CAAC,IAAI;IAaZ,OAAO,CAAC,IAAI;IAOZ,OAAO,CAAC,QAAQ;IAqChB,OAAO,CAAC,YAAY;IAuBpB,OAAO,CAAC,UAAU;YAQJ,cAAc;CAuJ5B;AAED;;;;GAIG;AACH,qBAAa,KAAK,CAAC,CAAC,CAAE,YAAW,OAAO,CAAC,CAAC,CAAC;IAC1C,OAAO,CAAC,QAAQ,CAAC,KAAK,CAAmC;IACzD,OAAO,CAAC,QAAQ,CAAyC;IACzD,OAAO,CAAC,IAAI,CAAS;IAEd,SAAS,CAAC,KAAK,EAAE,CAAC,GAAG,IAAI;IAIzB,SAAS,CAAC,KAAK,EAAE,OAAO,GAAG,IAAI;IAM/B,QAAQ,IAAI,IAAI;IAKvB,SAAS,CAAC,QAAQ,CAAC,KAAK,EAAE,OAAO,CAAC,aAAa,CAAC,CAAC,CAAC,CAAC,GAAG,IAAI;IAW7C,IAAI,IAAI,OAAO,CAAC,aAAa,CAAC,CAAC,CAAC,CAAC;CAU9C;AA0ID;;;;;;;;;;;;GAYG;AACH,wBAAgB,UAAU,CACzB,GAAG,EAAE,CACJ,IAAI,EAAE,MAAM,EACZ,EAAE,EAAE,MAAM,EACV,cAAc,EAAE,wBAAwB,KACpC,OAAO,CAAC,kBAAkB,CAAC,EAChC,WAAW,EAAE,MAAM,EACnB,SAAS,EAAE,MAAM,EACjB,OAAO,EAAE,MAAM,GAAG,SAAS,EAC3B,WAAW,EAAE,MAAM,EACnB,MAAM,EAAE,kBAAkB,EAC1B,MAAM,CAAC,EAAE,WAAW,EACpB,YAAY,CAAC,EAAE,MAAM,GACnB,OAAO,CAAC,yBAAyB,EAAE,CAAC,CA8GtC;AAED;;GAEG;AACH,eAAO,MAAM,kBAAkB,EAAE,OAAO,CAAC,yBAAyB,EAAE,CAInE,CAAC;AAEF;;;;GAIG;AACH,wBAAgB,kBAAkB,CACjC,WAAW,EAAE,OAAO,CAAC,yBAAyB,EAAE,CAAC,GAC/C,OAAO,CAAC,yBAAyB,EAAE,CAAC,CAatC;AAED;;;;GAIG;AACH,wBAAgB,cAAc,CAAC,CAAC,EAC/B,MAAM,EAAE,OAAO,CAAC,CAAC,CAAC,EAClB,OAAO,EAAE,CAAC,KAAK,EAAE,aAAa,CAAC,CAAC,CAAC,KAAK,IAAI,GACxC,OAAO,CAAC,CAAC,CAAC,CAQZ"}

dist/parallelRequests.js

@@ -9,2 +9,3 @@ "use strict";
 const client_utils_1 = require("@fluid-internal/client-utils");
+const core_interfaces_1 = require("@fluidframework/core-interfaces");
 const internal_1 = require("@fluidframework/core-utils/internal");
@@ -446,3 +447,5 @@ const internal_2 = require("@fluidframework/telemetry-utils/internal");
         reason: scenarioName,
-    });
+    }, undefined, // markers
+    undefined, // emitLogs
+    core_interfaces_1.LogLevel.info);
     const manager = new ParallelRequests(fromTotal, toTotal, payloadSize, logger, async (request, from, to, strongTo, propsPerRequest) => {
@@ -449,0 +452,0 @@ requests++;

dist/parallelRequests.js.map

@@ -1,1 +0,1 @@
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* Copyright (c) Microsoft Corporation and contributors. All rights reserved.\n * Licensed under the MIT License.\n */\n\nimport { performanceNow } from \"@fluid-internal/client-utils\";\nimport type { ITelemetryBaseProperties } from \"@fluidframework/core-interfaces\";\nimport { assert, Deferred } from \"@fluidframework/core-utils/internal\";\nimport type {\n\tIDeltasFetchResult,\n\tIStream,\n\tIStreamResult,\n\tISequencedDocumentMessage,\n} from \"@fluidframework/driver-definitions/internal\";\nimport type { TelemetryLoggerExt } from \"@fluidframework/telemetry-utils/internal\";\nimport { PerformanceEvent } from \"@fluidframework/telemetry-utils/internal\";\n\nimport {\n\tcanRetryOnError,\n\tcreateGenericNetworkError,\n\tgetRetryDelayFromError,\n} from \"./network.js\";\nimport { logNetworkFailure } from \"./networkUtils.js\";\n// For now, this package is versioned and released in unison with the specific drivers\nimport { pkgVersion as driverVersion } from \"./packageVersion.js\";\nimport { calculateMaxWaitTime } from \"./runWithRetry.js\";\n\n// We double this value in first try in when we calculate time to wait for in \"calculateMaxWaitTime\" function.\nconst MissingFetchDelayInMs = 50;\n\ntype WorkingState = \"working\" | \"done\" | \"canceled\";\n\n/**\n * Helper class to organize parallel fetching of data\n * It can be used to concurrently do many requests, while consuming\n * data in the right order. Take a look at UT for examples.\n * @param concurrency - level of concurrency\n * @param from - starting point of fetching data (inclusive)\n * @param to - ending point of fetching data. exclusive, or undefined if unknown\n * @param payloadSize - batch size\n * @param logger - logger to use\n * @param requestCallback - callback to request batches\n * @returns Queue that can be used to retrieve data\n * @internal\n */\nexport class ParallelRequests<T> {\n\tprivate latestRequested: number;\n\tprivate nextToDeliver: number;\n\tprivate readonly results = new Map<number, T[]>();\n\tprivate workingState: WorkingState = \"working\";\n\tprivate requestsInFlight = 0;\n\tprivate readonly endEvent = new Deferred<void>();\n\tprivate requests = 0;\n\tprivate readonly knewTo: boolean;\n\n\tprivate get working(): boolean {\n\t\treturn this.workingState === \"working\";\n\t}\n\tpublic get canceled(): boolean {\n\t\treturn this.workingState === \"canceled\";\n\t}\n\n\tconstructor(\n\t\tfrom: number,\n\t\tprivate to: number | undefined,\n\t\tprivate readonly payloadSize: number,\n\t\tprivate readonly logger: TelemetryLoggerExt,\n\t\tprivate readonly requestCallback: (\n\t\t\trequest: number,\n\t\t\tfrom: number,\n\t\t\tto: number,\n\t\t\tstrongTo: boolean,\n\t\t\tprops: ITelemetryBaseProperties,\n\t\t) => Promise<{ partial: boolean; cancel: boolean; payload: T[] }>,\n\t\tprivate readonly responseCallback: (payload: T[]) => void,\n\t) {\n\t\tthis.latestRequested = from;\n\t\tthis.nextToDeliver = from;\n\t\tthis.knewTo = to !== undefined;\n\t}\n\n\tpublic cancel(): void {\n\t\tif (this.working) {\n\t\t\tthis.workingState = \"canceled\";\n\t\t\tthis.endEvent.resolve();\n\t\t}\n\t}\n\n\tpublic async run(concurrency: number): Promise<void> {\n\t\tassert(concurrency > 0, 0x102 /* \"invalid level of concurrency\" */);\n\t\tassert(this.working, 0x103 /* \"trying to parallel run while not working\" */);\n\n\t\tlet c = concurrency;\n\t\twhile (c > 0) {\n\t\t\tc--;\n\t\t\tthis.addRequest();\n\t\t}\n\t\tthis.dispatch(); // will recalculate and trigger this.endEvent if needed\n\t\treturn this.endEvent.promise;\n\t}\n\n\tprivate done(): void {\n\t\t// We should satisfy request fully.\n\t\tassert(this.to !== undefined, 0x104 /* \"undefined end point for parallel fetch\" */);\n\t\tassert(\n\t\t\tthis.nextToDeliver >= this.to,\n\t\t\t0x105 /* \"unexpected end point for parallel fetch\" */,\n\t\t);\n\t\tif (this.working) {\n\t\t\tthis.workingState = \"done\";\n\t\t\tthis.endEvent.resolve();\n\t\t}\n\t}\n\n\tprivate fail(error): void {\n\t\tif (this.working) {\n\t\t\tthis.workingState = \"done\";\n\t\t\tthis.endEvent.reject(error);\n\t\t}\n\t}\n\n\tprivate dispatch(): void {\n\t\twhile (this.working) {\n\t\t\tconst value = this.results.get(this.nextToDeliver);\n\t\t\tif (value === undefined) {\n\t\t\t\tbreak;\n\t\t\t}\n\t\t\tthis.results.delete(this.nextToDeliver);\n\t\t\tassert(\n\t\t\t\tvalue.length <= this.payloadSize,\n\t\t\t\t0x1d9 /* \"addRequestCore() should break into smaller chunks\" */,\n\t\t\t);\n\t\t\tthis.nextToDeliver += value.length;\n\t\t\tthis.responseCallback(value);\n\t\t}\n\n\t\t// Account for cancellation - state might be not in consistent state on cancelling operation\n\t\tif (this.working) {\n\t\t\tif (this.requestsInFlight === 0) {\n\t\t\t\t// we should have dispatched everything, no matter whether we knew about the end or not.\n\t\t\t\t// see comment in addRequestCore() around throwing away chunk if it's above this.to\n\t\t\t\tassert(\n\t\t\t\t\tthis.results.size === 0,\n\t\t\t\t\t0x107 /* \"ending dispatch with remaining results to be sent\" */,\n\t\t\t\t);\n\t\t\t\tthis.done();\n\t\t\t} else if (this.to !== undefined && this.nextToDeliver >= this.to) {\n\t\t\t\t// Learned about the end and dispatched all the ops up to it.\n\t\t\t\t// Ignore all the in-flight requests above boundary - unblock caller sooner.\n\t\t\t\tassert(\n\t\t\t\t\t!this.knewTo,\n\t\t\t\t\t0x108 /* \"ending results dispatch but knew in advance about more requests\" */,\n\t\t\t\t);\n\t\t\t\tthis.done();\n\t\t\t}\n\t\t}\n\t}\n\n\tprivate getNextChunk(): { from: number; to: number } | undefined {\n\t\tif (!this.working) {\n\t\t\treturn undefined;\n\t\t}\n\n\t\tconst from = this.latestRequested;\n\t\tif (this.to !== undefined && this.to <= from) {\n\t\t\treturn undefined;\n\t\t}\n\n\t\t// this.latestRequested\n\t\t// inclusive on the right side! Exclusive on the left.\n\t\tthis.latestRequested += this.payloadSize;\n\n\t\tif (this.to !== undefined) {\n\t\t\tthis.latestRequested = Math.min(this.to, this.latestRequested);\n\t\t}\n\n\t\tassert(from < this.latestRequested, 0x109 /* \"unexpected next chunk position\" */);\n\n\t\treturn { from, to: this.latestRequested };\n\t}\n\n\tprivate addRequest(): void {\n\t\tconst chunk = this.getNextChunk();\n\t\tif (chunk === undefined) {\n\t\t\treturn;\n\t\t}\n\t\tthis.addRequestCore(chunk.from, chunk.to).catch(this.fail.bind(this));\n\t}\n\n\tprivate async addRequestCore(fromArg: number, toArg: number): Promise<void> {\n\t\tassert(this.working, 0x10a /* \"cannot add parallel request while not working\" */);\n\n\t\tlet from = fromArg;\n\t\tlet to = toArg;\n\n\t\t// to & from are exclusive\n\t\tthis.requestsInFlight++;\n\t\twhile (this.working) {\n\t\t\tconst requestedLength = to - from;\n\t\t\tassert(requestedLength > 0, 0x10b /* \"invalid parallel request range\" */);\n\n\t\t\t// We should not be wasting time asking for something useless.\n\t\t\tif (this.to !== undefined) {\n\t\t\t\tassert(from < this.to, 0x10c /* \"invalid parallel request start point\" */);\n\t\t\t\tassert(to <= this.to, 0x10d /* \"invalid parallel request end point\" */);\n\t\t\t}\n\n\t\t\tthis.requests++;\n\n\t\t\tconst promise = this.requestCallback(this.requests, from, to, this.to !== undefined, {});\n\n\t\t\t// dispatch any prior received data\n\t\t\tthis.dispatch();\n\n\t\t\tconst { payload, cancel, partial } = await promise;\n\n\t\t\tif (cancel) {\n\t\t\t\tthis.cancel();\n\t\t\t}\n\n\t\t\tif (this.to !== undefined && from >= this.to) {\n\t\t\t\t// while we were waiting for response, we learned on what is the boundary\n\t\t\t\t// We can get here (with actual result!) if situation changed while this request was in\n\t\t\t\t// flight, i.e. the end was extended over what we learn in some other request\n\t\t\t\t// While it's useful not to throw this result, this is very corner cases and makes logic\n\t\t\t\t// (including consistency checks) much harder to write correctly.\n\t\t\t\t// So for now, we are throwing this result out the window.\n\t\t\t\tassert(\n\t\t\t\t\t!this.knewTo,\n\t\t\t\t\t0x10e /* \"should not throw result if we knew about boundary in advance\" */,\n\t\t\t\t);\n\t\t\t\t// Learn how often it happens and if it's too wasteful to throw these chunks.\n\t\t\t\t// If it pops into our view a lot, we would need to reconsider how we approach it.\n\t\t\t\t// Note that this is not visible to user other than potentially not hitting 100% of\n\t\t\t\t// what we can in perf domain.\n\t\t\t\tif (payload.length > 0) {\n\t\t\t\t\tthis.logger.sendErrorEvent({\n\t\t\t\t\t\teventName: \"ParallelRequests_GotExtra\",\n\t\t\t\t\t\tfrom,\n\t\t\t\t\t\tto,\n\t\t\t\t\t\tend: this.to,\n\t\t\t\t\t\tlength: payload.length,\n\t\t\t\t\t});\n\t\t\t\t}\n\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\tif (this.working) {\n\t\t\t\tconst fromOrig = from;\n\t\t\t\tconst length = payload.length;\n\t\t\t\tlet fullChunk = requestedLength <= length; // we can possible get more than we asked.\n\n\t\t\t\tif (length === 0) {\n\t\t\t\t\t// 1. empty (partial) chunks should not be returned by various caching / adapter layers -\n\t\t\t\t\t//    they should fall back to next layer. This might be important invariant to hold to ensure\n\t\t\t\t\t//    that we are less likely have bugs where such layer would keep returning empty partial\n\t\t\t\t\t//    result on each call.\n\t\t\t\t\t// 2. Current invariant is that callback does retries until it gets something,\n\t\t\t\t\t//    with the goal of failing if zero data is retrieved in given amount of time.\n\t\t\t\t\t//    This is very specific property of storage / ops, so this logic is not here, but given only\n\t\t\t\t\t//    one user of this class, we assert that to catch issues earlier.\n\t\t\t\t\t// These invariant can be relaxed if needed.\n\t\t\t\t\tassert(\n\t\t\t\t\t\t!partial,\n\t\t\t\t\t\t0x10f /* \"empty/partial chunks should not be returned by caching\" */,\n\t\t\t\t\t);\n\t\t\t\t\tassert(\n\t\t\t\t\t\t!this.knewTo,\n\t\t\t\t\t\t0x110 /* \"callback should retry until valid fetch before it learns new boundary\" */,\n\t\t\t\t\t);\n\t\t\t\t} else {\n\t\t\t\t\t// We can get more than we asked for!\n\t\t\t\t\t// This can screw up logic in dispatch!\n\t\t\t\t\t// So push only batch size, and keep the rest for later - if conditions are favorable, we\n\t\t\t\t\t// will be able to use it. If not (parallel request overlapping these ops), it's easier to\n\t\t\t\t\t// discard them and wait for another (overlapping) request to come in later.\n\t\t\t\t\tif (requestedLength < length) {\n\t\t\t\t\t\t// This is error in a sense that it's not expected and likely points bug in other layer.\n\t\t\t\t\t\t// This layer copes with this situation just fine.\n\t\t\t\t\t\tthis.logger.sendTelemetryEvent({\n\t\t\t\t\t\t\teventName: \"ParallelRequests_Over\",\n\t\t\t\t\t\t\tfrom,\n\t\t\t\t\t\t\tto,\n\t\t\t\t\t\t\tlength,\n\t\t\t\t\t\t});\n\t\t\t\t\t}\n\t\t\t\t\tconst data = payload.splice(0, requestedLength);\n\t\t\t\t\tthis.results.set(from, data);\n\t\t\t\t\tfrom += data.length;\n\t\t\t\t}\n\n\t\t\t\tif (!partial && !fullChunk) {\n\t\t\t\t\tif (!this.knewTo) {\n\t\t\t\t\t\tif (this.to === undefined || this.to > from) {\n\t\t\t\t\t\t\t// The END\n\t\t\t\t\t\t\tthis.to = from;\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\t\t\t\t\t// We know that there are more items to be retrieved\n\t\t\t\t\t// Can we get partial chunk? Ideally storage indicates that's not a full chunk\n\t\t\t\t\t// Note that it's possible that not all ops hit storage yet.\n\t\t\t\t\t// We will come back to request more, and if we can't get any more ops soon, it's\n\t\t\t\t\t// catastrophic failure (see comment above on responsibility of callback to return something)\n\t\t\t\t\t// This layer will just keep trying until it gets full set.\n\t\t\t\t\tthis.logger.sendPerformanceEvent({\n\t\t\t\t\t\teventName: \"ParallelRequests_Partial\",\n\t\t\t\t\t\tfrom: fromOrig,\n\t\t\t\t\t\tto,\n\t\t\t\t\t\tlength,\n\t\t\t\t\t});\n\t\t\t\t}\n\n\t\t\t\tif (to === this.latestRequested) {\n\t\t\t\t\t// we can go after full chunk at the end if we received partial chunk, or more than asked\n\t\t\t\t\t// Also if we got more than we asked to, we can actually use those ops!\n\t\t\t\t\twhile (payload.length > 0) {\n\t\t\t\t\t\tconst data = payload.splice(0, requestedLength);\n\t\t\t\t\t\tthis.results.set(from, data);\n\t\t\t\t\t\tfrom += data.length;\n\t\t\t\t\t}\n\n\t\t\t\t\tthis.latestRequested = from;\n\t\t\t\t\tfullChunk = true;\n\t\t\t\t}\n\n\t\t\t\tif (fullChunk) {\n\t\t\t\t\tconst chunk = this.getNextChunk();\n\t\t\t\t\tif (chunk === undefined) {\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\t\t\t\t\tfrom = chunk.from;\n\t\t\t\t\tto = chunk.to;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tthis.requestsInFlight--;\n\t\tthis.dispatch();\n\t}\n}\n\n/**\n * Helper queue class to allow async push / pull\n * It's essentially a pipe allowing multiple writers, and single reader\n * @internal\n */\nexport class Queue<T> implements IStream<T> {\n\tprivate readonly queue: Promise<IStreamResult<T>>[] = [];\n\tprivate deferred: Deferred<IStreamResult<T>> | undefined;\n\tprivate done = false;\n\n\tpublic pushValue(value: T): void {\n\t\tthis.pushCore(Promise.resolve({ done: false, value }));\n\t}\n\n\tpublic pushError(error: unknown): void {\n\t\t// eslint-disable-next-line @typescript-eslint/prefer-promise-reject-errors\n\t\tthis.pushCore(Promise.reject(error));\n\t\tthis.done = true;\n\t}\n\n\tpublic pushDone(): void {\n\t\tthis.pushCore(Promise.resolve({ done: true }));\n\t\tthis.done = true;\n\t}\n\n\tprotected pushCore(value: Promise<IStreamResult<T>>): void {\n\t\tassert(!this.done, 0x112 /* \"cannot push onto queue if done\" */);\n\t\tif (this.deferred) {\n\t\t\tassert(this.queue.length === 0, 0x113 /* \"deferred queue should be empty\" */);\n\t\t\tthis.deferred.resolve(value);\n\t\t\tthis.deferred = undefined;\n\t\t} else {\n\t\t\tthis.queue.push(value);\n\t\t}\n\t}\n\n\tpublic async read(): Promise<IStreamResult<T>> {\n\t\tassert(this.deferred === undefined, 0x114 /* \"cannot pop if deferred\" */);\n\t\tconst value = this.queue.shift();\n\t\tif (value !== undefined) {\n\t\t\treturn value;\n\t\t}\n\t\tassert(!this.done, 0x115 /* \"queue should not be done during pop\" */);\n\t\tthis.deferred = new Deferred<IStreamResult<T>>();\n\t\treturn this.deferred.promise;\n\t}\n}\n\nconst waitForOnline = async (): Promise<void> => {\n\t// Only wait if we have a strong signal that we're offline - otherwise assume we're online.\n\tif (globalThis.navigator?.onLine === false && globalThis.addEventListener !== undefined) {\n\t\treturn new Promise<void>((resolve) => {\n\t\t\tconst resolveAndRemoveListener = (): void => {\n\t\t\t\tresolve();\n\t\t\t\tglobalThis.removeEventListener(\"online\", resolveAndRemoveListener);\n\t\t\t};\n\t\t\tglobalThis.addEventListener(\"online\", resolveAndRemoveListener);\n\t\t});\n\t}\n};\n\n/**\n * Retrieve single batch of ops\n * @param request - request index\n * @param from - inclusive boundary\n * @param to - exclusive boundary\n * @param telemetryEvent - telemetry event used to track consecutive batch of requests\n * @param strongTo - tells if ops in range from...to have to be there and have to be retrieved.\n * If false, returning less ops would mean we reached end of file.\n * @param logger - logger object to use to log progress & errors\n * @param signal - cancelation signal\n * @param scenarioName - reason for fetching ops\n * @returns An object with resulting ops and cancellation / partial result flags\n */\nasync function getSingleOpBatch(\n\tget: (telemetryProps: ITelemetryBaseProperties) => Promise<IDeltasFetchResult>,\n\tprops: ITelemetryBaseProperties,\n\tstrongTo: boolean,\n\tlogger: TelemetryLoggerExt,\n\tsignal?: AbortSignal,\n\tscenarioName?: string,\n): Promise<{ partial: boolean; cancel: boolean; payload: ISequencedDocumentMessage[] }> {\n\tlet lastSuccessTime: number | undefined;\n\tlet totalRetryAfterTime = 0;\n\tlet telemetryEvent: PerformanceEvent | undefined;\n\tlet retry: number = 0;\n\tconst nothing = { partial: false, cancel: true, payload: [] };\n\tlet waitStartTime: number = 0;\n\tlet waitTime = MissingFetchDelayInMs;\n\n\twhile (signal?.aborted !== true) {\n\t\tretry++;\n\t\tlet lastError: unknown;\n\t\tconst startTime = performanceNow();\n\n\t\ttry {\n\t\t\t// Issue async request for deltas\n\t\t\tconst { messages, partialResult } = await get({ ...props, retry } /* telemetry props */);\n\n\t\t\t// If we got messages back, return them.  Return regardless of whether we got messages back if we didn't\n\t\t\t// specify a \"to\", since we don't have an expectation of how many to receive.\n\t\t\tif (messages.length > 0 || !strongTo) {\n\t\t\t\t// Report this event if we waited to fetch ops due to being offline or throttling.\n\t\t\t\ttelemetryEvent?.end({\n\t\t\t\t\tduration: totalRetryAfterTime,\n\t\t\t\t\t...props,\n\t\t\t\t\treason: scenarioName,\n\t\t\t\t});\n\t\t\t\treturn { payload: messages, cancel: false, partial: partialResult };\n\t\t\t}\n\n\t\t\t// Otherwise, the storage gave us back an empty set of ops but we were expecting a non-empty set.\n\n\t\t\tif (lastSuccessTime === undefined) {\n\t\t\t\t// Take timestamp of the first time server responded successfully, even though it wasn't with the ops we asked for.\n\t\t\t\t// If we keep getting empty responses we'll eventually fail out below.\n\t\t\t\tlastSuccessTime = performanceNow();\n\t\t\t} else if (performanceNow() - lastSuccessTime > 30000) {\n\t\t\t\t// If we are connected and receiving proper responses from server, but can't get any ops back,\n\t\t\t\t// then give up after some time. This likely indicates the issue with ordering service not flushing\n\t\t\t\t// ops to storage quick enough, and possibly waiting for summaries, while summarizer can't get\n\t\t\t\t// current as it can't get ops.\n\t\t\t\tthrow createGenericNetworkError(\n\t\t\t\t\t// pre-0.58 error message: failedToRetrieveOpsFromStorage:TooManyRetries\n\t\t\t\t\t\"Failed to retrieve ops from storage (Too Many Retries)\",\n\t\t\t\t\t{ canRetry: false },\n\t\t\t\t\t{\n\t\t\t\t\t\tretry,\n\t\t\t\t\t\tdriverVersion,\n\t\t\t\t\t\t...props,\n\t\t\t\t\t},\n\t\t\t\t);\n\t\t\t}\n\t\t} catch (error) {\n\t\t\tlastError = error;\n\t\t\tconst canRetry = canRetryOnError(error);\n\n\t\t\tconst retryAfter = getRetryDelayFromError(error);\n\n\t\t\t// This will log to error table only if the error is non-retryable\n\t\t\tlogNetworkFailure(\n\t\t\t\tlogger,\n\t\t\t\t{\n\t\t\t\t\teventName: \"GetDeltas_Error\",\n\t\t\t\t\t...props,\n\t\t\t\t\tretry,\n\t\t\t\t\tduration: performanceNow() - startTime,\n\t\t\t\t\tretryAfter,\n\t\t\t\t\treason: scenarioName,\n\t\t\t\t},\n\t\t\t\terror,\n\t\t\t);\n\n\t\t\tif (!canRetry) {\n\t\t\t\t// It's game over scenario.\n\t\t\t\tthrow error;\n\t\t\t}\n\t\t}\n\n\t\tif (telemetryEvent === undefined) {\n\t\t\twaitStartTime = performanceNow();\n\t\t\ttelemetryEvent = PerformanceEvent.start(logger, {\n\t\t\t\teventName: \"GetDeltasWaitTime\",\n\t\t\t});\n\t\t}\n\n\t\twaitTime = calculateMaxWaitTime(waitTime, lastError);\n\n\t\t// If we get here something has gone wrong - either got an unexpected empty set of messages back or a real error.\n\t\t// Either way we will wait a little bit before retrying.\n\t\tawait new Promise<void>((resolve) => {\n\t\t\tsetTimeout(resolve, waitTime);\n\t\t});\n\n\t\t// If we believe we're offline, we assume there's no point in trying until we at least think we're online.\n\t\t// NOTE: This isn't strictly true for drivers that don't require network (e.g. local driver).  Really this logic\n\t\t// should probably live in the driver.\n\t\tawait waitForOnline();\n\t\ttotalRetryAfterTime += performanceNow() - waitStartTime;\n\t}\n\n\treturn nothing;\n}\n\n/**\n * Request ops from storage\n * @param get - Getter callback to get individual batches\n * @param concurrency - Number of concurrent requests to make\n * @param fromTotal - starting sequence number to fetch (inclusive)\n * @param toTotal - max (exclusive) sequence number to fetch\n * @param payloadSize - Payload size\n * @param logger - Logger to log progress and errors\n * @param signal - Cancelation signal\n * @param scenarioName - Reason for fetching ops\n * @returns Messages fetched\n * @internal\n */\nexport function requestOps(\n\tget: (\n\t\tfrom: number,\n\t\tto: number,\n\t\ttelemetryProps: ITelemetryBaseProperties,\n\t) => Promise<IDeltasFetchResult>,\n\tconcurrency: number,\n\tfromTotal: number,\n\ttoTotal: number | undefined,\n\tpayloadSize: number,\n\tlogger: TelemetryLoggerExt,\n\tsignal?: AbortSignal,\n\tscenarioName?: string,\n): IStream<ISequencedDocumentMessage[]> {\n\tlet requests = 0;\n\tlet lastFetch: number | undefined;\n\tlet length = 0;\n\tconst queue = new Queue<ISequencedDocumentMessage[]>();\n\n\tconst propsTotal: ITelemetryBaseProperties = {\n\t\tfromTotal,\n\t\ttoTotal,\n\t};\n\n\tconst telemetryEvent = PerformanceEvent.start(logger, {\n\t\teventName: \"GetDeltas\",\n\t\t...propsTotal,\n\t\treason: scenarioName,\n\t});\n\n\tconst manager = new ParallelRequests<ISequencedDocumentMessage>(\n\t\tfromTotal,\n\t\ttoTotal,\n\t\tpayloadSize,\n\t\tlogger,\n\t\tasync (\n\t\t\trequest: number,\n\t\t\tfrom: number,\n\t\t\tto: number,\n\t\t\tstrongTo: boolean,\n\t\t\tpropsPerRequest: ITelemetryBaseProperties,\n\t\t) => {\n\t\t\trequests++;\n\t\t\treturn getSingleOpBatch(\n\t\t\t\tasync (propsAll) => get(from, to, propsAll),\n\t\t\t\t{ request, from, to, ...propsTotal, ...propsPerRequest },\n\t\t\t\tstrongTo,\n\t\t\t\tlogger,\n\t\t\t\tsignal,\n\t\t\t\tscenarioName,\n\t\t\t);\n\t\t},\n\t\t(deltas: ISequencedDocumentMessage[]) => {\n\t\t\t// Assert continuing and right start.\n\t\t\tif (lastFetch === undefined) {\n\t\t\t\tassert(deltas[0].sequenceNumber === fromTotal, 0x26d /* \"wrong start\" */);\n\t\t\t} else {\n\t\t\t\tassert(deltas[0].sequenceNumber === lastFetch + 1, 0x26e /* \"wrong start\" */);\n\t\t\t}\n\t\t\tlastFetch = deltas[deltas.length - 1].sequenceNumber;\n\t\t\tassert(\n\t\t\t\tlastFetch - deltas[0].sequenceNumber + 1 === deltas.length,\n\t\t\t\t0x26f /* \"continuous and no duplicates\" */,\n\t\t\t);\n\t\t\tlength += deltas.length;\n\t\t\tqueue.pushValue(deltas);\n\t\t},\n\t);\n\n\t// Implement faster cancellation. getSingleOpBatch() checks signal, but only in between\n\t// waits (up to 10 seconds) and fetches (can take infinite amount of time).\n\t// While every such case should be improved and take into account signal (and thus cancel immediately),\n\t// it is beneficial to have catch-all\n\tconst listener = (event: Event): void => {\n\t\tmanager.cancel();\n\t};\n\tif (signal !== undefined) {\n\t\tsignal.addEventListener(\"abort\", listener);\n\t}\n\n\tmanager\n\t\t.run(concurrency)\n\t\t.finally(() => {\n\t\t\tif (signal !== undefined) {\n\t\t\t\tsignal.removeEventListener(\"abort\", listener);\n\t\t\t}\n\t\t})\n\t\t.then(() => {\n\t\t\tconst props = {\n\t\t\t\tlastFetch,\n\t\t\t\tlength,\n\t\t\t\trequests,\n\t\t\t};\n\t\t\tif (manager.canceled) {\n\t\t\t\ttelemetryEvent.cancel({ ...props, error: \"ops request cancelled by client\" });\n\t\t\t} else {\n\t\t\t\tassert(\n\t\t\t\t\ttoTotal === undefined || (lastFetch !== undefined && lastFetch >= toTotal - 1),\n\t\t\t\t\t0x270 /* \"All requested ops fetched\" */,\n\t\t\t\t);\n\t\t\t\ttelemetryEvent.end(props);\n\t\t\t}\n\t\t\tqueue.pushDone();\n\t\t})\n\t\t.catch((error) => {\n\t\t\ttelemetryEvent.cancel(\n\t\t\t\t{\n\t\t\t\t\tlastFetch,\n\t\t\t\t\tlength,\n\t\t\t\t\trequests,\n\t\t\t\t},\n\t\t\t\terror,\n\t\t\t);\n\t\t\tqueue.pushError(error);\n\t\t});\n\n\treturn queue;\n}\n\n/**\n * @internal\n */\nexport const emptyMessageStream: IStream<ISequencedDocumentMessage[]> = {\n\tread: async () => {\n\t\treturn { done: true };\n\t},\n};\n\n/**\n * Creates a stream from the provided promise of messages.\n *\n * @internal\n */\nexport function streamFromMessages(\n\tmessagesArg: Promise<ISequencedDocumentMessage[]>,\n): IStream<ISequencedDocumentMessage[]> {\n\tlet messages: Promise<ISequencedDocumentMessage[]> | undefined = messagesArg;\n\treturn {\n\t\tread: async () => {\n\t\t\tif (messages === undefined) {\n\t\t\t\treturn { done: true };\n\t\t\t}\n\t\t\tconst value = await messages;\n\t\t\t// eslint-disable-next-line require-atomic-updates\n\t\t\tmessages = undefined;\n\t\t\treturn value.length === 0 ? 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* Copyright (c) Microsoft Corporation and contributors. All rights reserved.\n * Licensed under the MIT License.\n */\n\nimport { performanceNow } from \"@fluid-internal/client-utils\";\nimport type { ITelemetryBaseProperties } from \"@fluidframework/core-interfaces\";\nimport { LogLevel } from \"@fluidframework/core-interfaces\";\nimport { assert, Deferred } from \"@fluidframework/core-utils/internal\";\nimport type {\n\tIDeltasFetchResult,\n\tIStream,\n\tIStreamResult,\n\tISequencedDocumentMessage,\n} from \"@fluidframework/driver-definitions/internal\";\nimport type { TelemetryLoggerExt } from \"@fluidframework/telemetry-utils/internal\";\nimport { PerformanceEvent } from \"@fluidframework/telemetry-utils/internal\";\n\nimport {\n\tcanRetryOnError,\n\tcreateGenericNetworkError,\n\tgetRetryDelayFromError,\n} from \"./network.js\";\nimport { logNetworkFailure } from \"./networkUtils.js\";\n// For now, this package is versioned and released in unison with the specific drivers\nimport { pkgVersion as driverVersion } from \"./packageVersion.js\";\nimport { calculateMaxWaitTime } from \"./runWithRetry.js\";\n\n// We double this value in first try in when we calculate time to wait for in \"calculateMaxWaitTime\" function.\nconst MissingFetchDelayInMs = 50;\n\ntype WorkingState = \"working\" | \"done\" | \"canceled\";\n\n/**\n * Helper class to organize parallel fetching of data\n * It can be used to concurrently do many requests, while consuming\n * data in the right order. Take a look at UT for examples.\n * @param concurrency - level of concurrency\n * @param from - starting point of fetching data (inclusive)\n * @param to - ending point of fetching data. exclusive, or undefined if unknown\n * @param payloadSize - batch size\n * @param logger - logger to use\n * @param requestCallback - callback to request batches\n * @returns Queue that can be used to retrieve data\n * @internal\n */\nexport class ParallelRequests<T> {\n\tprivate latestRequested: number;\n\tprivate nextToDeliver: number;\n\tprivate readonly results = new Map<number, T[]>();\n\tprivate workingState: WorkingState = \"working\";\n\tprivate requestsInFlight = 0;\n\tprivate readonly endEvent = new Deferred<void>();\n\tprivate requests = 0;\n\tprivate readonly knewTo: boolean;\n\n\tprivate get working(): boolean {\n\t\treturn this.workingState === \"working\";\n\t}\n\tpublic get canceled(): boolean {\n\t\treturn this.workingState === \"canceled\";\n\t}\n\n\tconstructor(\n\t\tfrom: number,\n\t\tprivate to: number | undefined,\n\t\tprivate readonly payloadSize: number,\n\t\tprivate readonly logger: TelemetryLoggerExt,\n\t\tprivate readonly requestCallback: (\n\t\t\trequest: number,\n\t\t\tfrom: number,\n\t\t\tto: number,\n\t\t\tstrongTo: boolean,\n\t\t\tprops: ITelemetryBaseProperties,\n\t\t) => Promise<{ partial: boolean; cancel: boolean; payload: T[] }>,\n\t\tprivate readonly responseCallback: (payload: T[]) => void,\n\t) {\n\t\tthis.latestRequested = from;\n\t\tthis.nextToDeliver = from;\n\t\tthis.knewTo = to !== undefined;\n\t}\n\n\tpublic cancel(): void {\n\t\tif (this.working) {\n\t\t\tthis.workingState = \"canceled\";\n\t\t\tthis.endEvent.resolve();\n\t\t}\n\t}\n\n\tpublic async run(concurrency: number): Promise<void> {\n\t\tassert(concurrency > 0, 0x102 /* \"invalid level of concurrency\" */);\n\t\tassert(this.working, 0x103 /* \"trying to parallel run while not working\" */);\n\n\t\tlet c = concurrency;\n\t\twhile (c > 0) {\n\t\t\tc--;\n\t\t\tthis.addRequest();\n\t\t}\n\t\tthis.dispatch(); // will recalculate and trigger this.endEvent if needed\n\t\treturn this.endEvent.promise;\n\t}\n\n\tprivate done(): void {\n\t\t// We should satisfy request fully.\n\t\tassert(this.to !== undefined, 0x104 /* \"undefined end point for parallel fetch\" */);\n\t\tassert(\n\t\t\tthis.nextToDeliver >= this.to,\n\t\t\t0x105 /* \"unexpected end point for parallel fetch\" */,\n\t\t);\n\t\tif (this.working) {\n\t\t\tthis.workingState = \"done\";\n\t\t\tthis.endEvent.resolve();\n\t\t}\n\t}\n\n\tprivate fail(error): void {\n\t\tif (this.working) {\n\t\t\tthis.workingState = \"done\";\n\t\t\tthis.endEvent.reject(error);\n\t\t}\n\t}\n\n\tprivate dispatch(): void {\n\t\twhile (this.working) {\n\t\t\tconst value = this.results.get(this.nextToDeliver);\n\t\t\tif (value === undefined) {\n\t\t\t\tbreak;\n\t\t\t}\n\t\t\tthis.results.delete(this.nextToDeliver);\n\t\t\tassert(\n\t\t\t\tvalue.length <= this.payloadSize,\n\t\t\t\t0x1d9 /* \"addRequestCore() should break into smaller chunks\" */,\n\t\t\t);\n\t\t\tthis.nextToDeliver += value.length;\n\t\t\tthis.responseCallback(value);\n\t\t}\n\n\t\t// Account for cancellation - state might be not in consistent state on cancelling operation\n\t\tif (this.working) {\n\t\t\tif (this.requestsInFlight === 0) {\n\t\t\t\t// we should have dispatched everything, no matter whether we knew about the end or not.\n\t\t\t\t// see comment in addRequestCore() around throwing away chunk if it's above this.to\n\t\t\t\tassert(\n\t\t\t\t\tthis.results.size === 0,\n\t\t\t\t\t0x107 /* \"ending dispatch with remaining results to be sent\" */,\n\t\t\t\t);\n\t\t\t\tthis.done();\n\t\t\t} else if (this.to !== undefined && this.nextToDeliver >= this.to) {\n\t\t\t\t// Learned about the end and dispatched all the ops up to it.\n\t\t\t\t// Ignore all the in-flight requests above boundary - unblock caller sooner.\n\t\t\t\tassert(\n\t\t\t\t\t!this.knewTo,\n\t\t\t\t\t0x108 /* \"ending results dispatch but knew in advance about more requests\" */,\n\t\t\t\t);\n\t\t\t\tthis.done();\n\t\t\t}\n\t\t}\n\t}\n\n\tprivate getNextChunk(): { from: number; to: number } | undefined {\n\t\tif (!this.working) {\n\t\t\treturn undefined;\n\t\t}\n\n\t\tconst from = this.latestRequested;\n\t\tif (this.to !== undefined && this.to <= from) {\n\t\t\treturn undefined;\n\t\t}\n\n\t\t// this.latestRequested\n\t\t// inclusive on the right side! Exclusive on the left.\n\t\tthis.latestRequested += this.payloadSize;\n\n\t\tif (this.to !== undefined) {\n\t\t\tthis.latestRequested = Math.min(this.to, this.latestRequested);\n\t\t}\n\n\t\tassert(from < this.latestRequested, 0x109 /* \"unexpected next chunk position\" */);\n\n\t\treturn { from, to: this.latestRequested };\n\t}\n\n\tprivate addRequest(): void {\n\t\tconst chunk = this.getNextChunk();\n\t\tif (chunk === undefined) {\n\t\t\treturn;\n\t\t}\n\t\tthis.addRequestCore(chunk.from, chunk.to).catch(this.fail.bind(this));\n\t}\n\n\tprivate async addRequestCore(fromArg: number, toArg: number): Promise<void> {\n\t\tassert(this.working, 0x10a /* \"cannot add parallel request while not working\" */);\n\n\t\tlet from = fromArg;\n\t\tlet to = toArg;\n\n\t\t// to & from are exclusive\n\t\tthis.requestsInFlight++;\n\t\twhile (this.working) {\n\t\t\tconst requestedLength = to - from;\n\t\t\tassert(requestedLength > 0, 0x10b /* \"invalid parallel request range\" */);\n\n\t\t\t// We should not be wasting time asking for something useless.\n\t\t\tif (this.to !== undefined) {\n\t\t\t\tassert(from < this.to, 0x10c /* \"invalid parallel request start point\" */);\n\t\t\t\tassert(to <= this.to, 0x10d /* \"invalid parallel request end point\" */);\n\t\t\t}\n\n\t\t\tthis.requests++;\n\n\t\t\tconst promise = this.requestCallback(this.requests, from, to, this.to !== undefined, {});\n\n\t\t\t// dispatch any prior received data\n\t\t\tthis.dispatch();\n\n\t\t\tconst { payload, cancel, partial } = await promise;\n\n\t\t\tif (cancel) {\n\t\t\t\tthis.cancel();\n\t\t\t}\n\n\t\t\tif (this.to !== undefined && from >= this.to) {\n\t\t\t\t// while we were waiting for response, we learned on what is the boundary\n\t\t\t\t// We can get here (with actual result!) if situation changed while this request was in\n\t\t\t\t// flight, i.e. the end was extended over what we learn in some other request\n\t\t\t\t// While it's useful not to throw this result, this is very corner cases and makes logic\n\t\t\t\t// (including consistency checks) much harder to write correctly.\n\t\t\t\t// So for now, we are throwing this result out the window.\n\t\t\t\tassert(\n\t\t\t\t\t!this.knewTo,\n\t\t\t\t\t0x10e /* \"should not throw result if we knew about boundary in advance\" */,\n\t\t\t\t);\n\t\t\t\t// Learn how often it happens and if it's too wasteful to throw these chunks.\n\t\t\t\t// If it pops into our view a lot, we would need to reconsider how we approach it.\n\t\t\t\t// Note that this is not visible to user other than potentially not hitting 100% of\n\t\t\t\t// what we can in perf domain.\n\t\t\t\tif (payload.length > 0) {\n\t\t\t\t\tthis.logger.sendErrorEvent({\n\t\t\t\t\t\teventName: \"ParallelRequests_GotExtra\",\n\t\t\t\t\t\tfrom,\n\t\t\t\t\t\tto,\n\t\t\t\t\t\tend: this.to,\n\t\t\t\t\t\tlength: payload.length,\n\t\t\t\t\t});\n\t\t\t\t}\n\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\tif (this.working) {\n\t\t\t\tconst fromOrig = from;\n\t\t\t\tconst length = payload.length;\n\t\t\t\tlet fullChunk = requestedLength <= length; // we can possible get more than we asked.\n\n\t\t\t\tif (length === 0) {\n\t\t\t\t\t// 1. empty (partial) chunks should not be returned by various caching / adapter layers -\n\t\t\t\t\t//    they should fall back to next layer. This might be important invariant to hold to ensure\n\t\t\t\t\t//    that we are less likely have bugs where such layer would keep returning empty partial\n\t\t\t\t\t//    result on each call.\n\t\t\t\t\t// 2. Current invariant is that callback does retries until it gets something,\n\t\t\t\t\t//    with the goal of failing if zero data is retrieved in given amount of time.\n\t\t\t\t\t//    This is very specific property of storage / ops, so this logic is not here, but given only\n\t\t\t\t\t//    one user of this class, we assert that to catch issues earlier.\n\t\t\t\t\t// These invariant can be relaxed if needed.\n\t\t\t\t\tassert(\n\t\t\t\t\t\t!partial,\n\t\t\t\t\t\t0x10f /* \"empty/partial chunks should not be returned by caching\" */,\n\t\t\t\t\t);\n\t\t\t\t\tassert(\n\t\t\t\t\t\t!this.knewTo,\n\t\t\t\t\t\t0x110 /* \"callback should retry until valid fetch before it learns new boundary\" */,\n\t\t\t\t\t);\n\t\t\t\t} else {\n\t\t\t\t\t// We can get more than we asked for!\n\t\t\t\t\t// This can screw up logic in dispatch!\n\t\t\t\t\t// So push only batch size, and keep the rest for later - if conditions are favorable, we\n\t\t\t\t\t// will be able to use it. If not (parallel request overlapping these ops), it's easier to\n\t\t\t\t\t// discard them and wait for another (overlapping) request to come in later.\n\t\t\t\t\tif (requestedLength < length) {\n\t\t\t\t\t\t// This is error in a sense that it's not expected and likely points bug in other layer.\n\t\t\t\t\t\t// This layer copes with this situation just fine.\n\t\t\t\t\t\tthis.logger.sendTelemetryEvent({\n\t\t\t\t\t\t\teventName: \"ParallelRequests_Over\",\n\t\t\t\t\t\t\tfrom,\n\t\t\t\t\t\t\tto,\n\t\t\t\t\t\t\tlength,\n\t\t\t\t\t\t});\n\t\t\t\t\t}\n\t\t\t\t\tconst data = payload.splice(0, requestedLength);\n\t\t\t\t\tthis.results.set(from, data);\n\t\t\t\t\tfrom += data.length;\n\t\t\t\t}\n\n\t\t\t\tif (!partial && !fullChunk) {\n\t\t\t\t\tif (!this.knewTo) {\n\t\t\t\t\t\tif (this.to === undefined || this.to > from) {\n\t\t\t\t\t\t\t// The END\n\t\t\t\t\t\t\tthis.to = from;\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\t\t\t\t\t// We know that there are more items to be retrieved\n\t\t\t\t\t// Can we get partial chunk? Ideally storage indicates that's not a full chunk\n\t\t\t\t\t// Note that it's possible that not all ops hit storage yet.\n\t\t\t\t\t// We will come back to request more, and if we can't get any more ops soon, it's\n\t\t\t\t\t// catastrophic failure (see comment above on responsibility of callback to return something)\n\t\t\t\t\t// This layer will just keep trying until it gets full set.\n\t\t\t\t\tthis.logger.sendPerformanceEvent({\n\t\t\t\t\t\teventName: \"ParallelRequests_Partial\",\n\t\t\t\t\t\tfrom: fromOrig,\n\t\t\t\t\t\tto,\n\t\t\t\t\t\tlength,\n\t\t\t\t\t});\n\t\t\t\t}\n\n\t\t\t\tif (to === this.latestRequested) {\n\t\t\t\t\t// we can go after full chunk at the end if we received partial chunk, or more than asked\n\t\t\t\t\t// Also if we got more than we asked to, we can actually use those ops!\n\t\t\t\t\twhile (payload.length > 0) {\n\t\t\t\t\t\tconst data = payload.splice(0, requestedLength);\n\t\t\t\t\t\tthis.results.set(from, data);\n\t\t\t\t\t\tfrom += data.length;\n\t\t\t\t\t}\n\n\t\t\t\t\tthis.latestRequested = from;\n\t\t\t\t\tfullChunk = true;\n\t\t\t\t}\n\n\t\t\t\tif (fullChunk) {\n\t\t\t\t\tconst chunk = this.getNextChunk();\n\t\t\t\t\tif (chunk === undefined) {\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\t\t\t\t\tfrom = chunk.from;\n\t\t\t\t\tto = chunk.to;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tthis.requestsInFlight--;\n\t\tthis.dispatch();\n\t}\n}\n\n/**\n * Helper queue class to allow async push / pull\n * It's essentially a pipe allowing multiple writers, and single reader\n * @internal\n */\nexport class Queue<T> implements IStream<T> {\n\tprivate readonly queue: Promise<IStreamResult<T>>[] = [];\n\tprivate deferred: Deferred<IStreamResult<T>> | undefined;\n\tprivate done = false;\n\n\tpublic pushValue(value: T): void {\n\t\tthis.pushCore(Promise.resolve({ done: false, value }));\n\t}\n\n\tpublic pushError(error: unknown): void {\n\t\t// eslint-disable-next-line @typescript-eslint/prefer-promise-reject-errors\n\t\tthis.pushCore(Promise.reject(error));\n\t\tthis.done = true;\n\t}\n\n\tpublic pushDone(): void {\n\t\tthis.pushCore(Promise.resolve({ done: true }));\n\t\tthis.done = true;\n\t}\n\n\tprotected pushCore(value: Promise<IStreamResult<T>>): void {\n\t\tassert(!this.done, 0x112 /* \"cannot push onto queue if done\" */);\n\t\tif (this.deferred) {\n\t\t\tassert(this.queue.length === 0, 0x113 /* \"deferred queue should be empty\" */);\n\t\t\tthis.deferred.resolve(value);\n\t\t\tthis.deferred = undefined;\n\t\t} else {\n\t\t\tthis.queue.push(value);\n\t\t}\n\t}\n\n\tpublic async read(): Promise<IStreamResult<T>> {\n\t\tassert(this.deferred === undefined, 0x114 /* \"cannot pop if deferred\" */);\n\t\tconst value = this.queue.shift();\n\t\tif (value !== undefined) {\n\t\t\treturn value;\n\t\t}\n\t\tassert(!this.done, 0x115 /* \"queue should not be done during pop\" */);\n\t\tthis.deferred = new Deferred<IStreamResult<T>>();\n\t\treturn this.deferred.promise;\n\t}\n}\n\nconst waitForOnline = async (): Promise<void> => {\n\t// Only wait if we have a strong signal that we're offline - otherwise assume we're online.\n\tif (globalThis.navigator?.onLine === false && globalThis.addEventListener !== undefined) {\n\t\treturn new Promise<void>((resolve) => {\n\t\t\tconst resolveAndRemoveListener = (): void => {\n\t\t\t\tresolve();\n\t\t\t\tglobalThis.removeEventListener(\"online\", resolveAndRemoveListener);\n\t\t\t};\n\t\t\tglobalThis.addEventListener(\"online\", resolveAndRemoveListener);\n\t\t});\n\t}\n};\n\n/**\n * Retrieve single batch of ops\n * @param request - request index\n * @param from - inclusive boundary\n * @param to - exclusive boundary\n * @param telemetryEvent - telemetry event used to track consecutive batch of requests\n * @param strongTo - tells if ops in range from...to have to be there and have to be retrieved.\n * If false, returning less ops would mean we reached end of file.\n * @param logger - logger object to use to log progress & errors\n * @param signal - cancelation signal\n * @param scenarioName - reason for fetching ops\n * @returns An object with resulting ops and cancellation / partial result flags\n */\nasync function getSingleOpBatch(\n\tget: (telemetryProps: ITelemetryBaseProperties) => Promise<IDeltasFetchResult>,\n\tprops: ITelemetryBaseProperties,\n\tstrongTo: boolean,\n\tlogger: TelemetryLoggerExt,\n\tsignal?: AbortSignal,\n\tscenarioName?: string,\n): Promise<{ partial: boolean; cancel: boolean; payload: ISequencedDocumentMessage[] }> {\n\tlet lastSuccessTime: number | undefined;\n\tlet totalRetryAfterTime = 0;\n\tlet telemetryEvent: PerformanceEvent | undefined;\n\tlet retry: number = 0;\n\tconst nothing = { partial: false, cancel: true, payload: [] };\n\tlet waitStartTime: number = 0;\n\tlet waitTime = MissingFetchDelayInMs;\n\n\twhile (signal?.aborted !== true) {\n\t\tretry++;\n\t\tlet lastError: unknown;\n\t\tconst startTime = performanceNow();\n\n\t\ttry {\n\t\t\t// Issue async request for deltas\n\t\t\tconst { messages, partialResult } = await get({ ...props, retry } /* telemetry props */);\n\n\t\t\t// If we got messages back, return them.  Return regardless of whether we got messages back if we didn't\n\t\t\t// specify a \"to\", since we don't have an expectation of how many to receive.\n\t\t\tif (messages.length > 0 || !strongTo) {\n\t\t\t\t// Report this event if we waited to fetch ops due to being offline or throttling.\n\t\t\t\ttelemetryEvent?.end({\n\t\t\t\t\tduration: totalRetryAfterTime,\n\t\t\t\t\t...props,\n\t\t\t\t\treason: scenarioName,\n\t\t\t\t});\n\t\t\t\treturn { payload: messages, cancel: false, partial: partialResult };\n\t\t\t}\n\n\t\t\t// Otherwise, the storage gave us back an empty set of ops but we were expecting a non-empty set.\n\n\t\t\tif (lastSuccessTime === undefined) {\n\t\t\t\t// Take timestamp of the first time server responded successfully, even though it wasn't with the ops we asked for.\n\t\t\t\t// If we keep getting empty responses we'll eventually fail out below.\n\t\t\t\tlastSuccessTime = performanceNow();\n\t\t\t} else if (performanceNow() - lastSuccessTime > 30000) {\n\t\t\t\t// If we are connected and receiving proper responses from server, but can't get any ops back,\n\t\t\t\t// then give up after some time. This likely indicates the issue with ordering service not flushing\n\t\t\t\t// ops to storage quick enough, and possibly waiting for summaries, while summarizer can't get\n\t\t\t\t// current as it can't get ops.\n\t\t\t\tthrow createGenericNetworkError(\n\t\t\t\t\t// pre-0.58 error message: failedToRetrieveOpsFromStorage:TooManyRetries\n\t\t\t\t\t\"Failed to retrieve ops from storage (Too Many Retries)\",\n\t\t\t\t\t{ canRetry: false },\n\t\t\t\t\t{\n\t\t\t\t\t\tretry,\n\t\t\t\t\t\tdriverVersion,\n\t\t\t\t\t\t...props,\n\t\t\t\t\t},\n\t\t\t\t);\n\t\t\t}\n\t\t} catch (error) {\n\t\t\tlastError = error;\n\t\t\tconst canRetry = canRetryOnError(error);\n\n\t\t\tconst retryAfter = getRetryDelayFromError(error);\n\n\t\t\t// This will log to error table only if the error is non-retryable\n\t\t\tlogNetworkFailure(\n\t\t\t\tlogger,\n\t\t\t\t{\n\t\t\t\t\teventName: \"GetDeltas_Error\",\n\t\t\t\t\t...props,\n\t\t\t\t\tretry,\n\t\t\t\t\tduration: performanceNow() - startTime,\n\t\t\t\t\tretryAfter,\n\t\t\t\t\treason: scenarioName,\n\t\t\t\t},\n\t\t\t\terror,\n\t\t\t);\n\n\t\t\tif (!canRetry) {\n\t\t\t\t// It's game over scenario.\n\t\t\t\tthrow error;\n\t\t\t}\n\t\t}\n\n\t\tif (telemetryEvent === undefined) {\n\t\t\twaitStartTime = performanceNow();\n\t\t\ttelemetryEvent = PerformanceEvent.start(logger, {\n\t\t\t\teventName: \"GetDeltasWaitTime\",\n\t\t\t});\n\t\t}\n\n\t\twaitTime = calculateMaxWaitTime(waitTime, lastError);\n\n\t\t// If we get here something has gone wrong - either got an unexpected empty set of messages back or a real error.\n\t\t// Either way we will wait a little bit before retrying.\n\t\tawait new Promise<void>((resolve) => {\n\t\t\tsetTimeout(resolve, waitTime);\n\t\t});\n\n\t\t// If we believe we're offline, we assume there's no point in trying until we at least think we're online.\n\t\t// NOTE: This isn't strictly true for drivers that don't require network (e.g. local driver).  Really this logic\n\t\t// should probably live in the driver.\n\t\tawait waitForOnline();\n\t\ttotalRetryAfterTime += performanceNow() - waitStartTime;\n\t}\n\n\treturn nothing;\n}\n\n/**\n * Request ops from storage\n * @param get - Getter callback to get individual batches\n * @param concurrency - Number of concurrent requests to make\n * @param fromTotal - starting sequence number to fetch (inclusive)\n * @param toTotal - max (exclusive) sequence number to fetch\n * @param payloadSize - Payload size\n * @param logger - Logger to log progress and errors\n * @param signal - Cancelation signal\n * @param scenarioName - Reason for fetching ops\n * @returns Messages fetched\n * @internal\n */\nexport function requestOps(\n\tget: (\n\t\tfrom: number,\n\t\tto: number,\n\t\ttelemetryProps: ITelemetryBaseProperties,\n\t) => Promise<IDeltasFetchResult>,\n\tconcurrency: number,\n\tfromTotal: number,\n\ttoTotal: number | undefined,\n\tpayloadSize: number,\n\tlogger: TelemetryLoggerExt,\n\tsignal?: AbortSignal,\n\tscenarioName?: string,\n): IStream<ISequencedDocumentMessage[]> {\n\tlet requests = 0;\n\tlet lastFetch: number | undefined;\n\tlet length = 0;\n\tconst queue = new Queue<ISequencedDocumentMessage[]>();\n\n\tconst propsTotal: ITelemetryBaseProperties = {\n\t\tfromTotal,\n\t\ttoTotal,\n\t};\n\n\tconst telemetryEvent = PerformanceEvent.start(\n\t\tlogger,\n\t\t{\n\t\t\teventName: \"GetDeltas\",\n\t\t\t...propsTotal,\n\t\t\treason: scenarioName,\n\t\t},\n\t\tundefined, // markers\n\t\tundefined, // emitLogs\n\t\tLogLevel.info,\n\t);\n\n\tconst manager = new ParallelRequests<ISequencedDocumentMessage>(\n\t\tfromTotal,\n\t\ttoTotal,\n\t\tpayloadSize,\n\t\tlogger,\n\t\tasync (\n\t\t\trequest: number,\n\t\t\tfrom: number,\n\t\t\tto: number,\n\t\t\tstrongTo: boolean,\n\t\t\tpropsPerRequest: ITelemetryBaseProperties,\n\t\t) => {\n\t\t\trequests++;\n\t\t\treturn getSingleOpBatch(\n\t\t\t\tasync (propsAll) => get(from, to, propsAll),\n\t\t\t\t{ request, from, to, ...propsTotal, ...propsPerRequest },\n\t\t\t\tstrongTo,\n\t\t\t\tlogger,\n\t\t\t\tsignal,\n\t\t\t\tscenarioName,\n\t\t\t);\n\t\t},\n\t\t(deltas: ISequencedDocumentMessage[]) => {\n\t\t\t// Assert continuing and right start.\n\t\t\tif (lastFetch === undefined) {\n\t\t\t\tassert(deltas[0].sequenceNumber === fromTotal, 0x26d /* \"wrong start\" */);\n\t\t\t} else {\n\t\t\t\tassert(deltas[0].sequenceNumber === lastFetch + 1, 0x26e /* \"wrong start\" */);\n\t\t\t}\n\t\t\tlastFetch = deltas[deltas.length - 1].sequenceNumber;\n\t\t\tassert(\n\t\t\t\tlastFetch - deltas[0].sequenceNumber + 1 === deltas.length,\n\t\t\t\t0x26f /* \"continuous and no duplicates\" */,\n\t\t\t);\n\t\t\tlength += deltas.length;\n\t\t\tqueue.pushValue(deltas);\n\t\t},\n\t);\n\n\t// Implement faster cancellation. getSingleOpBatch() checks signal, but only in between\n\t// waits (up to 10 seconds) and fetches (can take infinite amount of time).\n\t// While every such case should be improved and take into account signal (and thus cancel immediately),\n\t// it is beneficial to have catch-all\n\tconst listener = (event: Event): void => {\n\t\tmanager.cancel();\n\t};\n\tif (signal !== undefined) {\n\t\tsignal.addEventListener(\"abort\", listener);\n\t}\n\n\tmanager\n\t\t.run(concurrency)\n\t\t.finally(() => {\n\t\t\tif (signal !== undefined) {\n\t\t\t\tsignal.removeEventListener(\"abort\", listener);\n\t\t\t}\n\t\t})\n\t\t.then(() => {\n\t\t\tconst props = {\n\t\t\t\tlastFetch,\n\t\t\t\tlength,\n\t\t\t\trequests,\n\t\t\t};\n\t\t\tif (manager.canceled) {\n\t\t\t\ttelemetryEvent.cancel({ ...props, error: \"ops request cancelled by client\" });\n\t\t\t} else {\n\t\t\t\tassert(\n\t\t\t\t\ttoTotal === undefined || (lastFetch !== undefined && lastFetch >= toTotal - 1),\n\t\t\t\t\t0x270 /* \"All requested ops fetched\" */,\n\t\t\t\t);\n\t\t\t\ttelemetryEvent.end(props);\n\t\t\t}\n\t\t\tqueue.pushDone();\n\t\t})\n\t\t.catch((error) => {\n\t\t\ttelemetryEvent.cancel(\n\t\t\t\t{\n\t\t\t\t\tlastFetch,\n\t\t\t\t\tlength,\n\t\t\t\t\trequests,\n\t\t\t\t},\n\t\t\t\terror,\n\t\t\t);\n\t\t\tqueue.pushError(error);\n\t\t});\n\n\treturn queue;\n}\n\n/**\n * @internal\n */\nexport const emptyMessageStream: IStream<ISequencedDocumentMessage[]> = {\n\tread: async () => {\n\t\treturn { done: true };\n\t},\n};\n\n/**\n * Creates a stream from the provided promise of messages.\n *\n * @internal\n */\nexport function streamFromMessages(\n\tmessagesArg: Promise<ISequencedDocumentMessage[]>,\n): IStream<ISequencedDocumentMessage[]> {\n\tlet messages: Promise<ISequencedDocumentMessage[]> | undefined = messagesArg;\n\treturn {\n\t\tread: async () => {\n\t\t\tif (messages === undefined) {\n\t\t\t\treturn { done: true };\n\t\t\t}\n\t\t\tconst value = await messages;\n\t\t\t// eslint-disable-next-line require-atomic-updates\n\t\t\tmessages = undefined;\n\t\t\treturn value.length === 0 ? { done: true } : { done: false, value };\n\t\t},\n\t};\n}\n\n/**\n * Wraps the provided stream to observe values as they are read.\n *\n * @internal\n */\nexport function streamObserver<T>(\n\tstream: IStream<T>,\n\thandler: (value: IStreamResult<T>) => void,\n): IStream<T> {\n\treturn {\n\t\tread: async () => {\n\t\t\tconst value = await stream.read();\n\t\t\thandler(value);\n\t\t\treturn value;\n\t\t},\n\t};\n}\n"]}

lib/packageVersion.d.ts

@@ -8,3 +8,3 @@ /*!
 export declare const pkgName = "@fluidframework/driver-utils";
-export declare const pkgVersion = "2.100.0";
+export declare const pkgVersion = "2.101.0";
 //# sourceMappingURL=packageVersion.d.ts.map

lib/packageVersion.js

@@ -8,3 +8,3 @@ /*!
 export const pkgName = "@fluidframework/driver-utils";
-export const pkgVersion = "2.100.0";
+export const pkgVersion = "2.101.0";
 //# sourceMappingURL=packageVersion.js.map

lib/packageVersion.js.map

@@ -1,1 +0,1 @@
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+{"version":3,"file":"packageVersion.js","sourceRoot":"","sources":["../src/packageVersion.ts"],"names":[],"mappings":"AAAA;;;;;GAKG;AAEH,MAAM,CAAC,MAAM,OAAO,GAAG,8BAA8B,CAAC;AACtD,MAAM,CAAC,MAAM,UAAU,GAAG,SAAS,CAAC","sourcesContent":["/*!\n * Copyright (c) Microsoft Corporation and contributors. All rights reserved.\n * Licensed under the MIT License.\n *\n * THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY\n */\n\nexport const pkgName = \"@fluidframework/driver-utils\";\nexport const pkgVersion = \"2.101.0\";\n"]}

lib/parallelRequests.d.ts.map

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lib/parallelRequests.js

@@ -6,2 +6,3 @@ /*!
 import { performanceNow } from "@fluid-internal/client-utils";
+import { LogLevel } from "@fluidframework/core-interfaces";
 import { assert, Deferred } from "@fluidframework/core-utils/internal";
@@ -441,3 +442,5 @@ import { PerformanceEvent } from "@fluidframework/telemetry-utils/internal";
         reason: scenarioName,
-    });
+    }, undefined, // markers
+    undefined, // emitLogs
+    LogLevel.info);
     const manager = new ParallelRequests(fromTotal, toTotal, payloadSize, logger, async (request, from, to, strongTo, propsPerRequest) => {
@@ -444,0 +447,0 @@ requests++;

lib/parallelRequests.js.map

@@ -1,1 +0,1 @@
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* Copyright (c) Microsoft Corporation and contributors. All rights reserved.\n * Licensed under the MIT License.\n */\n\nimport { performanceNow } from \"@fluid-internal/client-utils\";\nimport type { ITelemetryBaseProperties } from \"@fluidframework/core-interfaces\";\nimport { assert, Deferred } from \"@fluidframework/core-utils/internal\";\nimport type {\n\tIDeltasFetchResult,\n\tIStream,\n\tIStreamResult,\n\tISequencedDocumentMessage,\n} from \"@fluidframework/driver-definitions/internal\";\nimport type { TelemetryLoggerExt } from \"@fluidframework/telemetry-utils/internal\";\nimport { PerformanceEvent } from \"@fluidframework/telemetry-utils/internal\";\n\nimport {\n\tcanRetryOnError,\n\tcreateGenericNetworkError,\n\tgetRetryDelayFromError,\n} from \"./network.js\";\nimport { logNetworkFailure } from \"./networkUtils.js\";\n// For now, this package is versioned and released in unison with the specific drivers\nimport { pkgVersion as driverVersion } from \"./packageVersion.js\";\nimport { calculateMaxWaitTime } from \"./runWithRetry.js\";\n\n// We double this value in first try in when we calculate time to wait for in \"calculateMaxWaitTime\" function.\nconst MissingFetchDelayInMs = 50;\n\ntype WorkingState = \"working\" | \"done\" | \"canceled\";\n\n/**\n * Helper class to organize parallel fetching of data\n * It can be used to concurrently do many requests, while consuming\n * data in the right order. Take a look at UT for examples.\n * @param concurrency - level of concurrency\n * @param from - starting point of fetching data (inclusive)\n * @param to - ending point of fetching data. exclusive, or undefined if unknown\n * @param payloadSize - batch size\n * @param logger - logger to use\n * @param requestCallback - callback to request batches\n * @returns Queue that can be used to retrieve data\n * @internal\n */\nexport class ParallelRequests<T> {\n\tprivate latestRequested: number;\n\tprivate nextToDeliver: number;\n\tprivate readonly results = new Map<number, T[]>();\n\tprivate workingState: WorkingState = \"working\";\n\tprivate requestsInFlight = 0;\n\tprivate readonly endEvent = new Deferred<void>();\n\tprivate requests = 0;\n\tprivate readonly knewTo: boolean;\n\n\tprivate get working(): boolean {\n\t\treturn this.workingState === \"working\";\n\t}\n\tpublic get canceled(): boolean {\n\t\treturn this.workingState === \"canceled\";\n\t}\n\n\tconstructor(\n\t\tfrom: number,\n\t\tprivate to: number | undefined,\n\t\tprivate readonly payloadSize: number,\n\t\tprivate readonly logger: TelemetryLoggerExt,\n\t\tprivate readonly requestCallback: (\n\t\t\trequest: number,\n\t\t\tfrom: number,\n\t\t\tto: number,\n\t\t\tstrongTo: boolean,\n\t\t\tprops: ITelemetryBaseProperties,\n\t\t) => Promise<{ partial: boolean; cancel: boolean; payload: T[] }>,\n\t\tprivate readonly responseCallback: (payload: T[]) => void,\n\t) {\n\t\tthis.latestRequested = from;\n\t\tthis.nextToDeliver = from;\n\t\tthis.knewTo = to !== undefined;\n\t}\n\n\tpublic cancel(): void {\n\t\tif (this.working) {\n\t\t\tthis.workingState = \"canceled\";\n\t\t\tthis.endEvent.resolve();\n\t\t}\n\t}\n\n\tpublic async run(concurrency: number): Promise<void> {\n\t\tassert(concurrency > 0, 0x102 /* \"invalid level of concurrency\" */);\n\t\tassert(this.working, 0x103 /* \"trying to parallel run while not working\" */);\n\n\t\tlet c = concurrency;\n\t\twhile (c > 0) {\n\t\t\tc--;\n\t\t\tthis.addRequest();\n\t\t}\n\t\tthis.dispatch(); // will recalculate and trigger this.endEvent if needed\n\t\treturn this.endEvent.promise;\n\t}\n\n\tprivate done(): void {\n\t\t// We should satisfy request fully.\n\t\tassert(this.to !== undefined, 0x104 /* \"undefined end point for parallel fetch\" */);\n\t\tassert(\n\t\t\tthis.nextToDeliver >= this.to,\n\t\t\t0x105 /* \"unexpected end point for parallel fetch\" */,\n\t\t);\n\t\tif (this.working) {\n\t\t\tthis.workingState = \"done\";\n\t\t\tthis.endEvent.resolve();\n\t\t}\n\t}\n\n\tprivate fail(error): void {\n\t\tif (this.working) {\n\t\t\tthis.workingState = \"done\";\n\t\t\tthis.endEvent.reject(error);\n\t\t}\n\t}\n\n\tprivate dispatch(): void {\n\t\twhile (this.working) {\n\t\t\tconst value = this.results.get(this.nextToDeliver);\n\t\t\tif (value === undefined) {\n\t\t\t\tbreak;\n\t\t\t}\n\t\t\tthis.results.delete(this.nextToDeliver);\n\t\t\tassert(\n\t\t\t\tvalue.length <= this.payloadSize,\n\t\t\t\t0x1d9 /* \"addRequestCore() should break into smaller chunks\" */,\n\t\t\t);\n\t\t\tthis.nextToDeliver += value.length;\n\t\t\tthis.responseCallback(value);\n\t\t}\n\n\t\t// Account for cancellation - state might be not in consistent state on cancelling operation\n\t\tif (this.working) {\n\t\t\tif (this.requestsInFlight === 0) {\n\t\t\t\t// we should have dispatched everything, no matter whether we knew about the end or not.\n\t\t\t\t// see comment in addRequestCore() around throwing away chunk if it's above this.to\n\t\t\t\tassert(\n\t\t\t\t\tthis.results.size === 0,\n\t\t\t\t\t0x107 /* \"ending dispatch with remaining results to be sent\" */,\n\t\t\t\t);\n\t\t\t\tthis.done();\n\t\t\t} else if (this.to !== undefined && this.nextToDeliver >= this.to) {\n\t\t\t\t// Learned about the end and dispatched all the ops up to it.\n\t\t\t\t// Ignore all the in-flight requests above boundary - unblock caller sooner.\n\t\t\t\tassert(\n\t\t\t\t\t!this.knewTo,\n\t\t\t\t\t0x108 /* \"ending results dispatch but knew in advance about more requests\" */,\n\t\t\t\t);\n\t\t\t\tthis.done();\n\t\t\t}\n\t\t}\n\t}\n\n\tprivate getNextChunk(): { from: number; to: number } | undefined {\n\t\tif (!this.working) {\n\t\t\treturn undefined;\n\t\t}\n\n\t\tconst from = this.latestRequested;\n\t\tif (this.to !== undefined && this.to <= from) {\n\t\t\treturn undefined;\n\t\t}\n\n\t\t// this.latestRequested\n\t\t// inclusive on the right side! Exclusive on the left.\n\t\tthis.latestRequested += this.payloadSize;\n\n\t\tif (this.to !== undefined) {\n\t\t\tthis.latestRequested = Math.min(this.to, this.latestRequested);\n\t\t}\n\n\t\tassert(from < this.latestRequested, 0x109 /* \"unexpected next chunk position\" */);\n\n\t\treturn { from, to: this.latestRequested };\n\t}\n\n\tprivate addRequest(): void {\n\t\tconst chunk = this.getNextChunk();\n\t\tif (chunk === undefined) {\n\t\t\treturn;\n\t\t}\n\t\tthis.addRequestCore(chunk.from, chunk.to).catch(this.fail.bind(this));\n\t}\n\n\tprivate async addRequestCore(fromArg: number, toArg: number): Promise<void> {\n\t\tassert(this.working, 0x10a /* \"cannot add parallel request while not working\" */);\n\n\t\tlet from = fromArg;\n\t\tlet to = toArg;\n\n\t\t// to & from are exclusive\n\t\tthis.requestsInFlight++;\n\t\twhile (this.working) {\n\t\t\tconst requestedLength = to - from;\n\t\t\tassert(requestedLength > 0, 0x10b /* \"invalid parallel request range\" */);\n\n\t\t\t// We should not be wasting time asking for something useless.\n\t\t\tif (this.to !== undefined) {\n\t\t\t\tassert(from < this.to, 0x10c /* \"invalid parallel request start point\" */);\n\t\t\t\tassert(to <= this.to, 0x10d /* \"invalid parallel request end point\" */);\n\t\t\t}\n\n\t\t\tthis.requests++;\n\n\t\t\tconst promise = this.requestCallback(this.requests, from, to, this.to !== undefined, {});\n\n\t\t\t// dispatch any prior received data\n\t\t\tthis.dispatch();\n\n\t\t\tconst { payload, cancel, partial } = await promise;\n\n\t\t\tif (cancel) {\n\t\t\t\tthis.cancel();\n\t\t\t}\n\n\t\t\tif (this.to !== undefined && from >= this.to) {\n\t\t\t\t// while we were waiting for response, we learned on what is the boundary\n\t\t\t\t// We can get here (with actual result!) if situation changed while this request was in\n\t\t\t\t// flight, i.e. the end was extended over what we learn in some other request\n\t\t\t\t// While it's useful not to throw this result, this is very corner cases and makes logic\n\t\t\t\t// (including consistency checks) much harder to write correctly.\n\t\t\t\t// So for now, we are throwing this result out the window.\n\t\t\t\tassert(\n\t\t\t\t\t!this.knewTo,\n\t\t\t\t\t0x10e /* \"should not throw result if we knew about boundary in advance\" */,\n\t\t\t\t);\n\t\t\t\t// Learn how often it happens and if it's too wasteful to throw these chunks.\n\t\t\t\t// If it pops into our view a lot, we would need to reconsider how we approach it.\n\t\t\t\t// Note that this is not visible to user other than potentially not hitting 100% of\n\t\t\t\t// what we can in perf domain.\n\t\t\t\tif (payload.length > 0) {\n\t\t\t\t\tthis.logger.sendErrorEvent({\n\t\t\t\t\t\teventName: \"ParallelRequests_GotExtra\",\n\t\t\t\t\t\tfrom,\n\t\t\t\t\t\tto,\n\t\t\t\t\t\tend: this.to,\n\t\t\t\t\t\tlength: payload.length,\n\t\t\t\t\t});\n\t\t\t\t}\n\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\tif (this.working) {\n\t\t\t\tconst fromOrig = from;\n\t\t\t\tconst length = payload.length;\n\t\t\t\tlet fullChunk = requestedLength <= length; // we can possible get more than we asked.\n\n\t\t\t\tif (length === 0) {\n\t\t\t\t\t// 1. empty (partial) chunks should not be returned by various caching / adapter layers -\n\t\t\t\t\t//    they should fall back to next layer. This might be important invariant to hold to ensure\n\t\t\t\t\t//    that we are less likely have bugs where such layer would keep returning empty partial\n\t\t\t\t\t//    result on each call.\n\t\t\t\t\t// 2. Current invariant is that callback does retries until it gets something,\n\t\t\t\t\t//    with the goal of failing if zero data is retrieved in given amount of time.\n\t\t\t\t\t//    This is very specific property of storage / ops, so this logic is not here, but given only\n\t\t\t\t\t//    one user of this class, we assert that to catch issues earlier.\n\t\t\t\t\t// These invariant can be relaxed if needed.\n\t\t\t\t\tassert(\n\t\t\t\t\t\t!partial,\n\t\t\t\t\t\t0x10f /* \"empty/partial chunks should not be returned by caching\" */,\n\t\t\t\t\t);\n\t\t\t\t\tassert(\n\t\t\t\t\t\t!this.knewTo,\n\t\t\t\t\t\t0x110 /* \"callback should retry until valid fetch before it learns new boundary\" */,\n\t\t\t\t\t);\n\t\t\t\t} else {\n\t\t\t\t\t// We can get more than we asked for!\n\t\t\t\t\t// This can screw up logic in dispatch!\n\t\t\t\t\t// So push only batch size, and keep the rest for later - if conditions are favorable, we\n\t\t\t\t\t// will be able to use it. If not (parallel request overlapping these ops), it's easier to\n\t\t\t\t\t// discard them and wait for another (overlapping) request to come in later.\n\t\t\t\t\tif (requestedLength < length) {\n\t\t\t\t\t\t// This is error in a sense that it's not expected and likely points bug in other layer.\n\t\t\t\t\t\t// This layer copes with this situation just fine.\n\t\t\t\t\t\tthis.logger.sendTelemetryEvent({\n\t\t\t\t\t\t\teventName: \"ParallelRequests_Over\",\n\t\t\t\t\t\t\tfrom,\n\t\t\t\t\t\t\tto,\n\t\t\t\t\t\t\tlength,\n\t\t\t\t\t\t});\n\t\t\t\t\t}\n\t\t\t\t\tconst data = payload.splice(0, requestedLength);\n\t\t\t\t\tthis.results.set(from, data);\n\t\t\t\t\tfrom += data.length;\n\t\t\t\t}\n\n\t\t\t\tif (!partial && !fullChunk) {\n\t\t\t\t\tif (!this.knewTo) {\n\t\t\t\t\t\tif (this.to === undefined || this.to > from) {\n\t\t\t\t\t\t\t// The END\n\t\t\t\t\t\t\tthis.to = from;\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\t\t\t\t\t// We know that there are more items to be retrieved\n\t\t\t\t\t// Can we get partial chunk? Ideally storage indicates that's not a full chunk\n\t\t\t\t\t// Note that it's possible that not all ops hit storage yet.\n\t\t\t\t\t// We will come back to request more, and if we can't get any more ops soon, it's\n\t\t\t\t\t// catastrophic failure (see comment above on responsibility of callback to return something)\n\t\t\t\t\t// This layer will just keep trying until it gets full set.\n\t\t\t\t\tthis.logger.sendPerformanceEvent({\n\t\t\t\t\t\teventName: \"ParallelRequests_Partial\",\n\t\t\t\t\t\tfrom: fromOrig,\n\t\t\t\t\t\tto,\n\t\t\t\t\t\tlength,\n\t\t\t\t\t});\n\t\t\t\t}\n\n\t\t\t\tif (to === this.latestRequested) {\n\t\t\t\t\t// we can go after full chunk at the end if we received partial chunk, or more than asked\n\t\t\t\t\t// Also if we got more than we asked to, we can actually use those ops!\n\t\t\t\t\twhile (payload.length > 0) {\n\t\t\t\t\t\tconst data = payload.splice(0, requestedLength);\n\t\t\t\t\t\tthis.results.set(from, data);\n\t\t\t\t\t\tfrom += data.length;\n\t\t\t\t\t}\n\n\t\t\t\t\tthis.latestRequested = from;\n\t\t\t\t\tfullChunk = true;\n\t\t\t\t}\n\n\t\t\t\tif (fullChunk) {\n\t\t\t\t\tconst chunk = this.getNextChunk();\n\t\t\t\t\tif (chunk === undefined) {\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\t\t\t\t\tfrom = chunk.from;\n\t\t\t\t\tto = chunk.to;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tthis.requestsInFlight--;\n\t\tthis.dispatch();\n\t}\n}\n\n/**\n * Helper queue class to allow async push / pull\n * It's essentially a pipe allowing multiple writers, and single reader\n * @internal\n */\nexport class Queue<T> implements IStream<T> {\n\tprivate readonly queue: Promise<IStreamResult<T>>[] = [];\n\tprivate deferred: Deferred<IStreamResult<T>> | undefined;\n\tprivate done = false;\n\n\tpublic pushValue(value: T): void {\n\t\tthis.pushCore(Promise.resolve({ done: false, value }));\n\t}\n\n\tpublic pushError(error: unknown): void {\n\t\t// eslint-disable-next-line @typescript-eslint/prefer-promise-reject-errors\n\t\tthis.pushCore(Promise.reject(error));\n\t\tthis.done = true;\n\t}\n\n\tpublic pushDone(): void {\n\t\tthis.pushCore(Promise.resolve({ done: true }));\n\t\tthis.done = true;\n\t}\n\n\tprotected pushCore(value: Promise<IStreamResult<T>>): void {\n\t\tassert(!this.done, 0x112 /* \"cannot push onto queue if done\" */);\n\t\tif (this.deferred) {\n\t\t\tassert(this.queue.length === 0, 0x113 /* \"deferred queue should be empty\" */);\n\t\t\tthis.deferred.resolve(value);\n\t\t\tthis.deferred = undefined;\n\t\t} else {\n\t\t\tthis.queue.push(value);\n\t\t}\n\t}\n\n\tpublic async read(): Promise<IStreamResult<T>> {\n\t\tassert(this.deferred === undefined, 0x114 /* \"cannot pop if deferred\" */);\n\t\tconst value = this.queue.shift();\n\t\tif (value !== undefined) {\n\t\t\treturn value;\n\t\t}\n\t\tassert(!this.done, 0x115 /* \"queue should not be done during pop\" */);\n\t\tthis.deferred = new Deferred<IStreamResult<T>>();\n\t\treturn this.deferred.promise;\n\t}\n}\n\nconst waitForOnline = async (): Promise<void> => {\n\t// Only wait if we have a strong signal that we're offline - otherwise assume we're online.\n\tif (globalThis.navigator?.onLine === false && globalThis.addEventListener !== undefined) {\n\t\treturn new Promise<void>((resolve) => {\n\t\t\tconst resolveAndRemoveListener = (): void => {\n\t\t\t\tresolve();\n\t\t\t\tglobalThis.removeEventListener(\"online\", resolveAndRemoveListener);\n\t\t\t};\n\t\t\tglobalThis.addEventListener(\"online\", resolveAndRemoveListener);\n\t\t});\n\t}\n};\n\n/**\n * Retrieve single batch of ops\n * @param request - request index\n * @param from - inclusive boundary\n * @param to - exclusive boundary\n * @param telemetryEvent - telemetry event used to track consecutive batch of requests\n * @param strongTo - tells if ops in range from...to have to be there and have to be retrieved.\n * If false, returning less ops would mean we reached end of file.\n * @param logger - logger object to use to log progress & errors\n * @param signal - cancelation signal\n * @param scenarioName - reason for fetching ops\n * @returns An object with resulting ops and cancellation / partial result flags\n */\nasync function getSingleOpBatch(\n\tget: (telemetryProps: ITelemetryBaseProperties) => Promise<IDeltasFetchResult>,\n\tprops: ITelemetryBaseProperties,\n\tstrongTo: boolean,\n\tlogger: TelemetryLoggerExt,\n\tsignal?: AbortSignal,\n\tscenarioName?: string,\n): Promise<{ partial: boolean; cancel: boolean; payload: ISequencedDocumentMessage[] }> {\n\tlet lastSuccessTime: number | undefined;\n\tlet totalRetryAfterTime = 0;\n\tlet telemetryEvent: PerformanceEvent | undefined;\n\tlet retry: number = 0;\n\tconst nothing = { partial: false, cancel: true, payload: [] };\n\tlet waitStartTime: number = 0;\n\tlet waitTime = MissingFetchDelayInMs;\n\n\twhile (signal?.aborted !== true) {\n\t\tretry++;\n\t\tlet lastError: unknown;\n\t\tconst startTime = performanceNow();\n\n\t\ttry {\n\t\t\t// Issue async request for deltas\n\t\t\tconst { messages, partialResult } = await get({ ...props, retry } /* telemetry props */);\n\n\t\t\t// If we got messages back, return them.  Return regardless of whether we got messages back if we didn't\n\t\t\t// specify a \"to\", since we don't have an expectation of how many to receive.\n\t\t\tif (messages.length > 0 || !strongTo) {\n\t\t\t\t// Report this event if we waited to fetch ops due to being offline or throttling.\n\t\t\t\ttelemetryEvent?.end({\n\t\t\t\t\tduration: totalRetryAfterTime,\n\t\t\t\t\t...props,\n\t\t\t\t\treason: scenarioName,\n\t\t\t\t});\n\t\t\t\treturn { payload: messages, cancel: false, partial: partialResult };\n\t\t\t}\n\n\t\t\t// Otherwise, the storage gave us back an empty set of ops but we were expecting a non-empty set.\n\n\t\t\tif (lastSuccessTime === undefined) {\n\t\t\t\t// Take timestamp of the first time server responded successfully, even though it wasn't with the ops we asked for.\n\t\t\t\t// If we keep getting empty responses we'll eventually fail out below.\n\t\t\t\tlastSuccessTime = performanceNow();\n\t\t\t} else if (performanceNow() - lastSuccessTime > 30000) {\n\t\t\t\t// If we are connected and receiving proper responses from server, but can't get any ops back,\n\t\t\t\t// then give up after some time. This likely indicates the issue with ordering service not flushing\n\t\t\t\t// ops to storage quick enough, and possibly waiting for summaries, while summarizer can't get\n\t\t\t\t// current as it can't get ops.\n\t\t\t\tthrow createGenericNetworkError(\n\t\t\t\t\t// pre-0.58 error message: failedToRetrieveOpsFromStorage:TooManyRetries\n\t\t\t\t\t\"Failed to retrieve ops from storage (Too Many Retries)\",\n\t\t\t\t\t{ canRetry: false },\n\t\t\t\t\t{\n\t\t\t\t\t\tretry,\n\t\t\t\t\t\tdriverVersion,\n\t\t\t\t\t\t...props,\n\t\t\t\t\t},\n\t\t\t\t);\n\t\t\t}\n\t\t} catch (error) {\n\t\t\tlastError = error;\n\t\t\tconst canRetry = canRetryOnError(error);\n\n\t\t\tconst retryAfter = getRetryDelayFromError(error);\n\n\t\t\t// This will log to error table only if the error is non-retryable\n\t\t\tlogNetworkFailure(\n\t\t\t\tlogger,\n\t\t\t\t{\n\t\t\t\t\teventName: \"GetDeltas_Error\",\n\t\t\t\t\t...props,\n\t\t\t\t\tretry,\n\t\t\t\t\tduration: performanceNow() - startTime,\n\t\t\t\t\tretryAfter,\n\t\t\t\t\treason: scenarioName,\n\t\t\t\t},\n\t\t\t\terror,\n\t\t\t);\n\n\t\t\tif (!canRetry) {\n\t\t\t\t// It's game over scenario.\n\t\t\t\tthrow error;\n\t\t\t}\n\t\t}\n\n\t\tif (telemetryEvent === undefined) {\n\t\t\twaitStartTime = performanceNow();\n\t\t\ttelemetryEvent = PerformanceEvent.start(logger, {\n\t\t\t\teventName: \"GetDeltasWaitTime\",\n\t\t\t});\n\t\t}\n\n\t\twaitTime = calculateMaxWaitTime(waitTime, lastError);\n\n\t\t// If we get here something has gone wrong - either got an unexpected empty set of messages back or a real error.\n\t\t// Either way we will wait a little bit before retrying.\n\t\tawait new Promise<void>((resolve) => {\n\t\t\tsetTimeout(resolve, waitTime);\n\t\t});\n\n\t\t// If we believe we're offline, we assume there's no point in trying until we at least think we're online.\n\t\t// NOTE: This isn't strictly true for drivers that don't require network (e.g. local driver).  Really this logic\n\t\t// should probably live in the driver.\n\t\tawait waitForOnline();\n\t\ttotalRetryAfterTime += performanceNow() - waitStartTime;\n\t}\n\n\treturn nothing;\n}\n\n/**\n * Request ops from storage\n * @param get - Getter callback to get individual batches\n * @param concurrency - Number of concurrent requests to make\n * @param fromTotal - starting sequence number to fetch (inclusive)\n * @param toTotal - max (exclusive) sequence number to fetch\n * @param payloadSize - Payload size\n * @param logger - Logger to log progress and errors\n * @param signal - Cancelation signal\n * @param scenarioName - Reason for fetching ops\n * @returns Messages fetched\n * @internal\n */\nexport function requestOps(\n\tget: (\n\t\tfrom: number,\n\t\tto: number,\n\t\ttelemetryProps: ITelemetryBaseProperties,\n\t) => Promise<IDeltasFetchResult>,\n\tconcurrency: number,\n\tfromTotal: number,\n\ttoTotal: number | undefined,\n\tpayloadSize: number,\n\tlogger: TelemetryLoggerExt,\n\tsignal?: AbortSignal,\n\tscenarioName?: string,\n): IStream<ISequencedDocumentMessage[]> {\n\tlet requests = 0;\n\tlet lastFetch: number | undefined;\n\tlet length = 0;\n\tconst queue = new Queue<ISequencedDocumentMessage[]>();\n\n\tconst propsTotal: ITelemetryBaseProperties = {\n\t\tfromTotal,\n\t\ttoTotal,\n\t};\n\n\tconst telemetryEvent = PerformanceEvent.start(logger, {\n\t\teventName: \"GetDeltas\",\n\t\t...propsTotal,\n\t\treason: scenarioName,\n\t});\n\n\tconst manager = new ParallelRequests<ISequencedDocumentMessage>(\n\t\tfromTotal,\n\t\ttoTotal,\n\t\tpayloadSize,\n\t\tlogger,\n\t\tasync (\n\t\t\trequest: number,\n\t\t\tfrom: number,\n\t\t\tto: number,\n\t\t\tstrongTo: boolean,\n\t\t\tpropsPerRequest: ITelemetryBaseProperties,\n\t\t) => {\n\t\t\trequests++;\n\t\t\treturn getSingleOpBatch(\n\t\t\t\tasync (propsAll) => get(from, to, propsAll),\n\t\t\t\t{ request, from, to, ...propsTotal, ...propsPerRequest },\n\t\t\t\tstrongTo,\n\t\t\t\tlogger,\n\t\t\t\tsignal,\n\t\t\t\tscenarioName,\n\t\t\t);\n\t\t},\n\t\t(deltas: ISequencedDocumentMessage[]) => {\n\t\t\t// Assert continuing and right start.\n\t\t\tif (lastFetch === undefined) {\n\t\t\t\tassert(deltas[0].sequenceNumber === fromTotal, 0x26d /* \"wrong start\" */);\n\t\t\t} else {\n\t\t\t\tassert(deltas[0].sequenceNumber === lastFetch + 1, 0x26e /* \"wrong start\" */);\n\t\t\t}\n\t\t\tlastFetch = deltas[deltas.length - 1].sequenceNumber;\n\t\t\tassert(\n\t\t\t\tlastFetch - deltas[0].sequenceNumber + 1 === deltas.length,\n\t\t\t\t0x26f /* \"continuous and no duplicates\" */,\n\t\t\t);\n\t\t\tlength += deltas.length;\n\t\t\tqueue.pushValue(deltas);\n\t\t},\n\t);\n\n\t// Implement faster cancellation. getSingleOpBatch() checks signal, but only in between\n\t// waits (up to 10 seconds) and fetches (can take infinite amount of time).\n\t// While every such case should be improved and take into account signal (and thus cancel immediately),\n\t// it is beneficial to have catch-all\n\tconst listener = (event: Event): void => {\n\t\tmanager.cancel();\n\t};\n\tif (signal !== undefined) {\n\t\tsignal.addEventListener(\"abort\", listener);\n\t}\n\n\tmanager\n\t\t.run(concurrency)\n\t\t.finally(() => {\n\t\t\tif (signal !== undefined) {\n\t\t\t\tsignal.removeEventListener(\"abort\", listener);\n\t\t\t}\n\t\t})\n\t\t.then(() => {\n\t\t\tconst props = {\n\t\t\t\tlastFetch,\n\t\t\t\tlength,\n\t\t\t\trequests,\n\t\t\t};\n\t\t\tif (manager.canceled) {\n\t\t\t\ttelemetryEvent.cancel({ ...props, error: \"ops request cancelled by client\" });\n\t\t\t} else {\n\t\t\t\tassert(\n\t\t\t\t\ttoTotal === undefined || (lastFetch !== undefined && lastFetch >= toTotal - 1),\n\t\t\t\t\t0x270 /* \"All requested ops fetched\" */,\n\t\t\t\t);\n\t\t\t\ttelemetryEvent.end(props);\n\t\t\t}\n\t\t\tqueue.pushDone();\n\t\t})\n\t\t.catch((error) => {\n\t\t\ttelemetryEvent.cancel(\n\t\t\t\t{\n\t\t\t\t\tlastFetch,\n\t\t\t\t\tlength,\n\t\t\t\t\trequests,\n\t\t\t\t},\n\t\t\t\terror,\n\t\t\t);\n\t\t\tqueue.pushError(error);\n\t\t});\n\n\treturn queue;\n}\n\n/**\n * @internal\n */\nexport const emptyMessageStream: IStream<ISequencedDocumentMessage[]> = {\n\tread: async () => {\n\t\treturn { done: true };\n\t},\n};\n\n/**\n * Creates a stream from the provided promise of messages.\n *\n * @internal\n */\nexport function streamFromMessages(\n\tmessagesArg: Promise<ISequencedDocumentMessage[]>,\n): IStream<ISequencedDocumentMessage[]> {\n\tlet messages: Promise<ISequencedDocumentMessage[]> | undefined = messagesArg;\n\treturn {\n\t\tread: async () => {\n\t\t\tif (messages === undefined) {\n\t\t\t\treturn { done: true };\n\t\t\t}\n\t\t\tconst value = await messages;\n\t\t\t// eslint-disable-next-line require-atomic-updates\n\t\t\tmessages = undefined;\n\t\t\treturn value.length === 0 ? 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* Copyright (c) Microsoft Corporation and contributors. All rights reserved.\n * Licensed under the MIT License.\n */\n\nimport { performanceNow } from \"@fluid-internal/client-utils\";\nimport type { ITelemetryBaseProperties } from \"@fluidframework/core-interfaces\";\nimport { LogLevel } from \"@fluidframework/core-interfaces\";\nimport { assert, Deferred } from \"@fluidframework/core-utils/internal\";\nimport type {\n\tIDeltasFetchResult,\n\tIStream,\n\tIStreamResult,\n\tISequencedDocumentMessage,\n} from \"@fluidframework/driver-definitions/internal\";\nimport type { TelemetryLoggerExt } from \"@fluidframework/telemetry-utils/internal\";\nimport { PerformanceEvent } from \"@fluidframework/telemetry-utils/internal\";\n\nimport {\n\tcanRetryOnError,\n\tcreateGenericNetworkError,\n\tgetRetryDelayFromError,\n} from \"./network.js\";\nimport { logNetworkFailure } from \"./networkUtils.js\";\n// For now, this package is versioned and released in unison with the specific drivers\nimport { pkgVersion as driverVersion } from \"./packageVersion.js\";\nimport { calculateMaxWaitTime } from \"./runWithRetry.js\";\n\n// We double this value in first try in when we calculate time to wait for in \"calculateMaxWaitTime\" function.\nconst MissingFetchDelayInMs = 50;\n\ntype WorkingState = \"working\" | \"done\" | \"canceled\";\n\n/**\n * Helper class to organize parallel fetching of data\n * It can be used to concurrently do many requests, while consuming\n * data in the right order. Take a look at UT for examples.\n * @param concurrency - level of concurrency\n * @param from - starting point of fetching data (inclusive)\n * @param to - ending point of fetching data. exclusive, or undefined if unknown\n * @param payloadSize - batch size\n * @param logger - logger to use\n * @param requestCallback - callback to request batches\n * @returns Queue that can be used to retrieve data\n * @internal\n */\nexport class ParallelRequests<T> {\n\tprivate latestRequested: number;\n\tprivate nextToDeliver: number;\n\tprivate readonly results = new Map<number, T[]>();\n\tprivate workingState: WorkingState = \"working\";\n\tprivate requestsInFlight = 0;\n\tprivate readonly endEvent = new Deferred<void>();\n\tprivate requests = 0;\n\tprivate readonly knewTo: boolean;\n\n\tprivate get working(): boolean {\n\t\treturn this.workingState === \"working\";\n\t}\n\tpublic get canceled(): boolean {\n\t\treturn this.workingState === \"canceled\";\n\t}\n\n\tconstructor(\n\t\tfrom: number,\n\t\tprivate to: number | undefined,\n\t\tprivate readonly payloadSize: number,\n\t\tprivate readonly logger: TelemetryLoggerExt,\n\t\tprivate readonly requestCallback: (\n\t\t\trequest: number,\n\t\t\tfrom: number,\n\t\t\tto: number,\n\t\t\tstrongTo: boolean,\n\t\t\tprops: ITelemetryBaseProperties,\n\t\t) => Promise<{ partial: boolean; cancel: boolean; payload: T[] }>,\n\t\tprivate readonly responseCallback: (payload: T[]) => void,\n\t) {\n\t\tthis.latestRequested = from;\n\t\tthis.nextToDeliver = from;\n\t\tthis.knewTo = to !== undefined;\n\t}\n\n\tpublic cancel(): void {\n\t\tif (this.working) {\n\t\t\tthis.workingState = \"canceled\";\n\t\t\tthis.endEvent.resolve();\n\t\t}\n\t}\n\n\tpublic async run(concurrency: number): Promise<void> {\n\t\tassert(concurrency > 0, 0x102 /* \"invalid level of concurrency\" */);\n\t\tassert(this.working, 0x103 /* \"trying to parallel run while not working\" */);\n\n\t\tlet c = concurrency;\n\t\twhile (c > 0) {\n\t\t\tc--;\n\t\t\tthis.addRequest();\n\t\t}\n\t\tthis.dispatch(); // will recalculate and trigger this.endEvent if needed\n\t\treturn this.endEvent.promise;\n\t}\n\n\tprivate done(): void {\n\t\t// We should satisfy request fully.\n\t\tassert(this.to !== undefined, 0x104 /* \"undefined end point for parallel fetch\" */);\n\t\tassert(\n\t\t\tthis.nextToDeliver >= this.to,\n\t\t\t0x105 /* \"unexpected end point for parallel fetch\" */,\n\t\t);\n\t\tif (this.working) {\n\t\t\tthis.workingState = \"done\";\n\t\t\tthis.endEvent.resolve();\n\t\t}\n\t}\n\n\tprivate fail(error): void {\n\t\tif (this.working) {\n\t\t\tthis.workingState = \"done\";\n\t\t\tthis.endEvent.reject(error);\n\t\t}\n\t}\n\n\tprivate dispatch(): void {\n\t\twhile (this.working) {\n\t\t\tconst value = this.results.get(this.nextToDeliver);\n\t\t\tif (value === undefined) {\n\t\t\t\tbreak;\n\t\t\t}\n\t\t\tthis.results.delete(this.nextToDeliver);\n\t\t\tassert(\n\t\t\t\tvalue.length <= this.payloadSize,\n\t\t\t\t0x1d9 /* \"addRequestCore() should break into smaller chunks\" */,\n\t\t\t);\n\t\t\tthis.nextToDeliver += value.length;\n\t\t\tthis.responseCallback(value);\n\t\t}\n\n\t\t// Account for cancellation - state might be not in consistent state on cancelling operation\n\t\tif (this.working) {\n\t\t\tif (this.requestsInFlight === 0) {\n\t\t\t\t// we should have dispatched everything, no matter whether we knew about the end or not.\n\t\t\t\t// see comment in addRequestCore() around throwing away chunk if it's above this.to\n\t\t\t\tassert(\n\t\t\t\t\tthis.results.size === 0,\n\t\t\t\t\t0x107 /* \"ending dispatch with remaining results to be sent\" */,\n\t\t\t\t);\n\t\t\t\tthis.done();\n\t\t\t} else if (this.to !== undefined && this.nextToDeliver >= this.to) {\n\t\t\t\t// Learned about the end and dispatched all the ops up to it.\n\t\t\t\t// Ignore all the in-flight requests above boundary - unblock caller sooner.\n\t\t\t\tassert(\n\t\t\t\t\t!this.knewTo,\n\t\t\t\t\t0x108 /* \"ending results dispatch but knew in advance about more requests\" */,\n\t\t\t\t);\n\t\t\t\tthis.done();\n\t\t\t}\n\t\t}\n\t}\n\n\tprivate getNextChunk(): { from: number; to: number } | undefined {\n\t\tif (!this.working) {\n\t\t\treturn undefined;\n\t\t}\n\n\t\tconst from = this.latestRequested;\n\t\tif (this.to !== undefined && this.to <= from) {\n\t\t\treturn undefined;\n\t\t}\n\n\t\t// this.latestRequested\n\t\t// inclusive on the right side! Exclusive on the left.\n\t\tthis.latestRequested += this.payloadSize;\n\n\t\tif (this.to !== undefined) {\n\t\t\tthis.latestRequested = Math.min(this.to, this.latestRequested);\n\t\t}\n\n\t\tassert(from < this.latestRequested, 0x109 /* \"unexpected next chunk position\" */);\n\n\t\treturn { from, to: this.latestRequested };\n\t}\n\n\tprivate addRequest(): void {\n\t\tconst chunk = this.getNextChunk();\n\t\tif (chunk === undefined) {\n\t\t\treturn;\n\t\t}\n\t\tthis.addRequestCore(chunk.from, chunk.to).catch(this.fail.bind(this));\n\t}\n\n\tprivate async addRequestCore(fromArg: number, toArg: number): Promise<void> {\n\t\tassert(this.working, 0x10a /* \"cannot add parallel request while not working\" */);\n\n\t\tlet from = fromArg;\n\t\tlet to = toArg;\n\n\t\t// to & from are exclusive\n\t\tthis.requestsInFlight++;\n\t\twhile (this.working) {\n\t\t\tconst requestedLength = to - from;\n\t\t\tassert(requestedLength > 0, 0x10b /* \"invalid parallel request range\" */);\n\n\t\t\t// We should not be wasting time asking for something useless.\n\t\t\tif (this.to !== undefined) {\n\t\t\t\tassert(from < this.to, 0x10c /* \"invalid parallel request start point\" */);\n\t\t\t\tassert(to <= this.to, 0x10d /* \"invalid parallel request end point\" */);\n\t\t\t}\n\n\t\t\tthis.requests++;\n\n\t\t\tconst promise = this.requestCallback(this.requests, from, to, this.to !== undefined, {});\n\n\t\t\t// dispatch any prior received data\n\t\t\tthis.dispatch();\n\n\t\t\tconst { payload, cancel, partial } = await promise;\n\n\t\t\tif (cancel) {\n\t\t\t\tthis.cancel();\n\t\t\t}\n\n\t\t\tif (this.to !== undefined && from >= this.to) {\n\t\t\t\t// while we were waiting for response, we learned on what is the boundary\n\t\t\t\t// We can get here (with actual result!) if situation changed while this request was in\n\t\t\t\t// flight, i.e. the end was extended over what we learn in some other request\n\t\t\t\t// While it's useful not to throw this result, this is very corner cases and makes logic\n\t\t\t\t// (including consistency checks) much harder to write correctly.\n\t\t\t\t// So for now, we are throwing this result out the window.\n\t\t\t\tassert(\n\t\t\t\t\t!this.knewTo,\n\t\t\t\t\t0x10e /* \"should not throw result if we knew about boundary in advance\" */,\n\t\t\t\t);\n\t\t\t\t// Learn how often it happens and if it's too wasteful to throw these chunks.\n\t\t\t\t// If it pops into our view a lot, we would need to reconsider how we approach it.\n\t\t\t\t// Note that this is not visible to user other than potentially not hitting 100% of\n\t\t\t\t// what we can in perf domain.\n\t\t\t\tif (payload.length > 0) {\n\t\t\t\t\tthis.logger.sendErrorEvent({\n\t\t\t\t\t\teventName: \"ParallelRequests_GotExtra\",\n\t\t\t\t\t\tfrom,\n\t\t\t\t\t\tto,\n\t\t\t\t\t\tend: this.to,\n\t\t\t\t\t\tlength: payload.length,\n\t\t\t\t\t});\n\t\t\t\t}\n\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\tif (this.working) {\n\t\t\t\tconst fromOrig = from;\n\t\t\t\tconst length = payload.length;\n\t\t\t\tlet fullChunk = requestedLength <= length; // we can possible get more than we asked.\n\n\t\t\t\tif (length === 0) {\n\t\t\t\t\t// 1. empty (partial) chunks should not be returned by various caching / adapter layers -\n\t\t\t\t\t//    they should fall back to next layer. This might be important invariant to hold to ensure\n\t\t\t\t\t//    that we are less likely have bugs where such layer would keep returning empty partial\n\t\t\t\t\t//    result on each call.\n\t\t\t\t\t// 2. Current invariant is that callback does retries until it gets something,\n\t\t\t\t\t//    with the goal of failing if zero data is retrieved in given amount of time.\n\t\t\t\t\t//    This is very specific property of storage / ops, so this logic is not here, but given only\n\t\t\t\t\t//    one user of this class, we assert that to catch issues earlier.\n\t\t\t\t\t// These invariant can be relaxed if needed.\n\t\t\t\t\tassert(\n\t\t\t\t\t\t!partial,\n\t\t\t\t\t\t0x10f /* \"empty/partial chunks should not be returned by caching\" */,\n\t\t\t\t\t);\n\t\t\t\t\tassert(\n\t\t\t\t\t\t!this.knewTo,\n\t\t\t\t\t\t0x110 /* \"callback should retry until valid fetch before it learns new boundary\" */,\n\t\t\t\t\t);\n\t\t\t\t} else {\n\t\t\t\t\t// We can get more than we asked for!\n\t\t\t\t\t// This can screw up logic in dispatch!\n\t\t\t\t\t// So push only batch size, and keep the rest for later - if conditions are favorable, we\n\t\t\t\t\t// will be able to use it. If not (parallel request overlapping these ops), it's easier to\n\t\t\t\t\t// discard them and wait for another (overlapping) request to come in later.\n\t\t\t\t\tif (requestedLength < length) {\n\t\t\t\t\t\t// This is error in a sense that it's not expected and likely points bug in other layer.\n\t\t\t\t\t\t// This layer copes with this situation just fine.\n\t\t\t\t\t\tthis.logger.sendTelemetryEvent({\n\t\t\t\t\t\t\teventName: \"ParallelRequests_Over\",\n\t\t\t\t\t\t\tfrom,\n\t\t\t\t\t\t\tto,\n\t\t\t\t\t\t\tlength,\n\t\t\t\t\t\t});\n\t\t\t\t\t}\n\t\t\t\t\tconst data = payload.splice(0, requestedLength);\n\t\t\t\t\tthis.results.set(from, data);\n\t\t\t\t\tfrom += data.length;\n\t\t\t\t}\n\n\t\t\t\tif (!partial && !fullChunk) {\n\t\t\t\t\tif (!this.knewTo) {\n\t\t\t\t\t\tif (this.to === undefined || this.to > from) {\n\t\t\t\t\t\t\t// The END\n\t\t\t\t\t\t\tthis.to = from;\n\t\t\t\t\t\t}\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\t\t\t\t\t// We know that there are more items to be retrieved\n\t\t\t\t\t// Can we get partial chunk? Ideally storage indicates that's not a full chunk\n\t\t\t\t\t// Note that it's possible that not all ops hit storage yet.\n\t\t\t\t\t// We will come back to request more, and if we can't get any more ops soon, it's\n\t\t\t\t\t// catastrophic failure (see comment above on responsibility of callback to return something)\n\t\t\t\t\t// This layer will just keep trying until it gets full set.\n\t\t\t\t\tthis.logger.sendPerformanceEvent({\n\t\t\t\t\t\teventName: \"ParallelRequests_Partial\",\n\t\t\t\t\t\tfrom: fromOrig,\n\t\t\t\t\t\tto,\n\t\t\t\t\t\tlength,\n\t\t\t\t\t});\n\t\t\t\t}\n\n\t\t\t\tif (to === this.latestRequested) {\n\t\t\t\t\t// we can go after full chunk at the end if we received partial chunk, or more than asked\n\t\t\t\t\t// Also if we got more than we asked to, we can actually use those ops!\n\t\t\t\t\twhile (payload.length > 0) {\n\t\t\t\t\t\tconst data = payload.splice(0, requestedLength);\n\t\t\t\t\t\tthis.results.set(from, data);\n\t\t\t\t\t\tfrom += data.length;\n\t\t\t\t\t}\n\n\t\t\t\t\tthis.latestRequested = from;\n\t\t\t\t\tfullChunk = true;\n\t\t\t\t}\n\n\t\t\t\tif (fullChunk) {\n\t\t\t\t\tconst chunk = this.getNextChunk();\n\t\t\t\t\tif (chunk === undefined) {\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\t\t\t\t\tfrom = chunk.from;\n\t\t\t\t\tto = chunk.to;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tthis.requestsInFlight--;\n\t\tthis.dispatch();\n\t}\n}\n\n/**\n * Helper queue class to allow async push / pull\n * It's essentially a pipe allowing multiple writers, and single reader\n * @internal\n */\nexport class Queue<T> implements IStream<T> {\n\tprivate readonly queue: Promise<IStreamResult<T>>[] = [];\n\tprivate deferred: Deferred<IStreamResult<T>> | undefined;\n\tprivate done = false;\n\n\tpublic pushValue(value: T): void {\n\t\tthis.pushCore(Promise.resolve({ done: false, value }));\n\t}\n\n\tpublic pushError(error: unknown): void {\n\t\t// eslint-disable-next-line @typescript-eslint/prefer-promise-reject-errors\n\t\tthis.pushCore(Promise.reject(error));\n\t\tthis.done = true;\n\t}\n\n\tpublic pushDone(): void {\n\t\tthis.pushCore(Promise.resolve({ done: true }));\n\t\tthis.done = true;\n\t}\n\n\tprotected pushCore(value: Promise<IStreamResult<T>>): void {\n\t\tassert(!this.done, 0x112 /* \"cannot push onto queue if done\" */);\n\t\tif (this.deferred) {\n\t\t\tassert(this.queue.length === 0, 0x113 /* \"deferred queue should be empty\" */);\n\t\t\tthis.deferred.resolve(value);\n\t\t\tthis.deferred = undefined;\n\t\t} else {\n\t\t\tthis.queue.push(value);\n\t\t}\n\t}\n\n\tpublic async read(): Promise<IStreamResult<T>> {\n\t\tassert(this.deferred === undefined, 0x114 /* \"cannot pop if deferred\" */);\n\t\tconst value = this.queue.shift();\n\t\tif (value !== undefined) {\n\t\t\treturn value;\n\t\t}\n\t\tassert(!this.done, 0x115 /* \"queue should not be done during pop\" */);\n\t\tthis.deferred = new Deferred<IStreamResult<T>>();\n\t\treturn this.deferred.promise;\n\t}\n}\n\nconst waitForOnline = async (): Promise<void> => {\n\t// Only wait if we have a strong signal that we're offline - otherwise assume we're online.\n\tif (globalThis.navigator?.onLine === false && globalThis.addEventListener !== undefined) {\n\t\treturn new Promise<void>((resolve) => {\n\t\t\tconst resolveAndRemoveListener = (): void => {\n\t\t\t\tresolve();\n\t\t\t\tglobalThis.removeEventListener(\"online\", resolveAndRemoveListener);\n\t\t\t};\n\t\t\tglobalThis.addEventListener(\"online\", resolveAndRemoveListener);\n\t\t});\n\t}\n};\n\n/**\n * Retrieve single batch of ops\n * @param request - request index\n * @param from - inclusive boundary\n * @param to - exclusive boundary\n * @param telemetryEvent - telemetry event used to track consecutive batch of requests\n * @param strongTo - tells if ops in range from...to have to be there and have to be retrieved.\n * If false, returning less ops would mean we reached end of file.\n * @param logger - logger object to use to log progress & errors\n * @param signal - cancelation signal\n * @param scenarioName - reason for fetching ops\n * @returns An object with resulting ops and cancellation / partial result flags\n */\nasync function getSingleOpBatch(\n\tget: (telemetryProps: ITelemetryBaseProperties) => Promise<IDeltasFetchResult>,\n\tprops: ITelemetryBaseProperties,\n\tstrongTo: boolean,\n\tlogger: TelemetryLoggerExt,\n\tsignal?: AbortSignal,\n\tscenarioName?: string,\n): Promise<{ partial: boolean; cancel: boolean; payload: ISequencedDocumentMessage[] }> {\n\tlet lastSuccessTime: number | undefined;\n\tlet totalRetryAfterTime = 0;\n\tlet telemetryEvent: PerformanceEvent | undefined;\n\tlet retry: number = 0;\n\tconst nothing = { partial: false, cancel: true, payload: [] };\n\tlet waitStartTime: number = 0;\n\tlet waitTime = MissingFetchDelayInMs;\n\n\twhile (signal?.aborted !== true) {\n\t\tretry++;\n\t\tlet lastError: unknown;\n\t\tconst startTime = performanceNow();\n\n\t\ttry {\n\t\t\t// Issue async request for deltas\n\t\t\tconst { messages, partialResult } = await get({ ...props, retry } /* telemetry props */);\n\n\t\t\t// If we got messages back, return them.  Return regardless of whether we got messages back if we didn't\n\t\t\t// specify a \"to\", since we don't have an expectation of how many to receive.\n\t\t\tif (messages.length > 0 || !strongTo) {\n\t\t\t\t// Report this event if we waited to fetch ops due to being offline or throttling.\n\t\t\t\ttelemetryEvent?.end({\n\t\t\t\t\tduration: totalRetryAfterTime,\n\t\t\t\t\t...props,\n\t\t\t\t\treason: scenarioName,\n\t\t\t\t});\n\t\t\t\treturn { payload: messages, cancel: false, partial: partialResult };\n\t\t\t}\n\n\t\t\t// Otherwise, the storage gave us back an empty set of ops but we were expecting a non-empty set.\n\n\t\t\tif (lastSuccessTime === undefined) {\n\t\t\t\t// Take timestamp of the first time server responded successfully, even though it wasn't with the ops we asked for.\n\t\t\t\t// If we keep getting empty responses we'll eventually fail out below.\n\t\t\t\tlastSuccessTime = performanceNow();\n\t\t\t} else if (performanceNow() - lastSuccessTime > 30000) {\n\t\t\t\t// If we are connected and receiving proper responses from server, but can't get any ops back,\n\t\t\t\t// then give up after some time. This likely indicates the issue with ordering service not flushing\n\t\t\t\t// ops to storage quick enough, and possibly waiting for summaries, while summarizer can't get\n\t\t\t\t// current as it can't get ops.\n\t\t\t\tthrow createGenericNetworkError(\n\t\t\t\t\t// pre-0.58 error message: failedToRetrieveOpsFromStorage:TooManyRetries\n\t\t\t\t\t\"Failed to retrieve ops from storage (Too Many Retries)\",\n\t\t\t\t\t{ canRetry: false },\n\t\t\t\t\t{\n\t\t\t\t\t\tretry,\n\t\t\t\t\t\tdriverVersion,\n\t\t\t\t\t\t...props,\n\t\t\t\t\t},\n\t\t\t\t);\n\t\t\t}\n\t\t} catch (error) {\n\t\t\tlastError = error;\n\t\t\tconst canRetry = canRetryOnError(error);\n\n\t\t\tconst retryAfter = getRetryDelayFromError(error);\n\n\t\t\t// This will log to error table only if the error is non-retryable\n\t\t\tlogNetworkFailure(\n\t\t\t\tlogger,\n\t\t\t\t{\n\t\t\t\t\teventName: \"GetDeltas_Error\",\n\t\t\t\t\t...props,\n\t\t\t\t\tretry,\n\t\t\t\t\tduration: performanceNow() - startTime,\n\t\t\t\t\tretryAfter,\n\t\t\t\t\treason: scenarioName,\n\t\t\t\t},\n\t\t\t\terror,\n\t\t\t);\n\n\t\t\tif (!canRetry) {\n\t\t\t\t// It's game over scenario.\n\t\t\t\tthrow error;\n\t\t\t}\n\t\t}\n\n\t\tif (telemetryEvent === undefined) {\n\t\t\twaitStartTime = performanceNow();\n\t\t\ttelemetryEvent = PerformanceEvent.start(logger, {\n\t\t\t\teventName: \"GetDeltasWaitTime\",\n\t\t\t});\n\t\t}\n\n\t\twaitTime = calculateMaxWaitTime(waitTime, lastError);\n\n\t\t// If we get here something has gone wrong - either got an unexpected empty set of messages back or a real error.\n\t\t// Either way we will wait a little bit before retrying.\n\t\tawait new Promise<void>((resolve) => {\n\t\t\tsetTimeout(resolve, waitTime);\n\t\t});\n\n\t\t// If we believe we're offline, we assume there's no point in trying until we at least think we're online.\n\t\t// NOTE: This isn't strictly true for drivers that don't require network (e.g. local driver).  Really this logic\n\t\t// should probably live in the driver.\n\t\tawait waitForOnline();\n\t\ttotalRetryAfterTime += performanceNow() - waitStartTime;\n\t}\n\n\treturn nothing;\n}\n\n/**\n * Request ops from storage\n * @param get - Getter callback to get individual batches\n * @param concurrency - Number of concurrent requests to make\n * @param fromTotal - starting sequence number to fetch (inclusive)\n * @param toTotal - max (exclusive) sequence number to fetch\n * @param payloadSize - Payload size\n * @param logger - Logger to log progress and errors\n * @param signal - Cancelation signal\n * @param scenarioName - Reason for fetching ops\n * @returns Messages fetched\n * @internal\n */\nexport function requestOps(\n\tget: (\n\t\tfrom: number,\n\t\tto: number,\n\t\ttelemetryProps: ITelemetryBaseProperties,\n\t) => Promise<IDeltasFetchResult>,\n\tconcurrency: number,\n\tfromTotal: number,\n\ttoTotal: number | undefined,\n\tpayloadSize: number,\n\tlogger: TelemetryLoggerExt,\n\tsignal?: AbortSignal,\n\tscenarioName?: string,\n): IStream<ISequencedDocumentMessage[]> {\n\tlet requests = 0;\n\tlet lastFetch: number | undefined;\n\tlet length = 0;\n\tconst queue = new Queue<ISequencedDocumentMessage[]>();\n\n\tconst propsTotal: ITelemetryBaseProperties = {\n\t\tfromTotal,\n\t\ttoTotal,\n\t};\n\n\tconst telemetryEvent = PerformanceEvent.start(\n\t\tlogger,\n\t\t{\n\t\t\teventName: \"GetDeltas\",\n\t\t\t...propsTotal,\n\t\t\treason: scenarioName,\n\t\t},\n\t\tundefined, // markers\n\t\tundefined, // emitLogs\n\t\tLogLevel.info,\n\t);\n\n\tconst manager = new ParallelRequests<ISequencedDocumentMessage>(\n\t\tfromTotal,\n\t\ttoTotal,\n\t\tpayloadSize,\n\t\tlogger,\n\t\tasync (\n\t\t\trequest: number,\n\t\t\tfrom: number,\n\t\t\tto: number,\n\t\t\tstrongTo: boolean,\n\t\t\tpropsPerRequest: ITelemetryBaseProperties,\n\t\t) => {\n\t\t\trequests++;\n\t\t\treturn getSingleOpBatch(\n\t\t\t\tasync (propsAll) => get(from, to, propsAll),\n\t\t\t\t{ request, from, to, ...propsTotal, ...propsPerRequest },\n\t\t\t\tstrongTo,\n\t\t\t\tlogger,\n\t\t\t\tsignal,\n\t\t\t\tscenarioName,\n\t\t\t);\n\t\t},\n\t\t(deltas: ISequencedDocumentMessage[]) => {\n\t\t\t// Assert continuing and right start.\n\t\t\tif (lastFetch === undefined) {\n\t\t\t\tassert(deltas[0].sequenceNumber === fromTotal, 0x26d /* \"wrong start\" */);\n\t\t\t} else {\n\t\t\t\tassert(deltas[0].sequenceNumber === lastFetch + 1, 0x26e /* \"wrong start\" */);\n\t\t\t}\n\t\t\tlastFetch = deltas[deltas.length - 1].sequenceNumber;\n\t\t\tassert(\n\t\t\t\tlastFetch - deltas[0].sequenceNumber + 1 === deltas.length,\n\t\t\t\t0x26f /* \"continuous and no duplicates\" */,\n\t\t\t);\n\t\t\tlength += deltas.length;\n\t\t\tqueue.pushValue(deltas);\n\t\t},\n\t);\n\n\t// Implement faster cancellation. getSingleOpBatch() checks signal, but only in between\n\t// waits (up to 10 seconds) and fetches (can take infinite amount of time).\n\t// While every such case should be improved and take into account signal (and thus cancel immediately),\n\t// it is beneficial to have catch-all\n\tconst listener = (event: Event): void => {\n\t\tmanager.cancel();\n\t};\n\tif (signal !== undefined) {\n\t\tsignal.addEventListener(\"abort\", listener);\n\t}\n\n\tmanager\n\t\t.run(concurrency)\n\t\t.finally(() => {\n\t\t\tif (signal !== undefined) {\n\t\t\t\tsignal.removeEventListener(\"abort\", listener);\n\t\t\t}\n\t\t})\n\t\t.then(() => {\n\t\t\tconst props = {\n\t\t\t\tlastFetch,\n\t\t\t\tlength,\n\t\t\t\trequests,\n\t\t\t};\n\t\t\tif (manager.canceled) {\n\t\t\t\ttelemetryEvent.cancel({ ...props, error: \"ops request cancelled by client\" });\n\t\t\t} else {\n\t\t\t\tassert(\n\t\t\t\t\ttoTotal === undefined || (lastFetch !== undefined && lastFetch >= toTotal - 1),\n\t\t\t\t\t0x270 /* \"All requested ops fetched\" */,\n\t\t\t\t);\n\t\t\t\ttelemetryEvent.end(props);\n\t\t\t}\n\t\t\tqueue.pushDone();\n\t\t})\n\t\t.catch((error) => {\n\t\t\ttelemetryEvent.cancel(\n\t\t\t\t{\n\t\t\t\t\tlastFetch,\n\t\t\t\t\tlength,\n\t\t\t\t\trequests,\n\t\t\t\t},\n\t\t\t\terror,\n\t\t\t);\n\t\t\tqueue.pushError(error);\n\t\t});\n\n\treturn queue;\n}\n\n/**\n * @internal\n */\nexport const emptyMessageStream: IStream<ISequencedDocumentMessage[]> = {\n\tread: async () => {\n\t\treturn { done: true };\n\t},\n};\n\n/**\n * Creates a stream from the provided promise of messages.\n *\n * @internal\n */\nexport function streamFromMessages(\n\tmessagesArg: Promise<ISequencedDocumentMessage[]>,\n): IStream<ISequencedDocumentMessage[]> {\n\tlet messages: Promise<ISequencedDocumentMessage[]> | undefined = messagesArg;\n\treturn {\n\t\tread: async () => {\n\t\t\tif (messages === undefined) {\n\t\t\t\treturn { done: true };\n\t\t\t}\n\t\t\tconst value = await messages;\n\t\t\t// eslint-disable-next-line require-atomic-updates\n\t\t\tmessages = undefined;\n\t\t\treturn value.length === 0 ? { done: true } : { done: false, value };\n\t\t},\n\t};\n}\n\n/**\n * Wraps the provided stream to observe values as they are read.\n *\n * @internal\n */\nexport function streamObserver<T>(\n\tstream: IStream<T>,\n\thandler: (value: IStreamResult<T>) => void,\n): IStream<T> {\n\treturn {\n\t\tread: async () => {\n\t\t\tconst value = await stream.read();\n\t\t\thandler(value);\n\t\t\treturn value;\n\t\t},\n\t};\n}\n"]}

package.json

 {
   "name": "@fluidframework/driver-utils",
-  "version": "2.100.0",
+  "version": "2.101.0",
   "description": "Collection of utility functions for Fluid drivers",
@@ -72,7 +72,7 @@ "homepage": "https://fluidframework.com",
   "dependencies": {
-    "@fluid-internal/client-utils": "~2.100.0",
-    "@fluidframework/core-interfaces": "~2.100.0",
-    "@fluidframework/core-utils": "~2.100.0",
-    "@fluidframework/driver-definitions": "~2.100.0",
-    "@fluidframework/telemetry-utils": "~2.100.0",
+    "@fluid-internal/client-utils": "~2.101.0",
+    "@fluidframework/core-interfaces": "~2.101.0",
+    "@fluidframework/core-utils": "~2.101.0",
+    "@fluidframework/driver-definitions": "~2.101.0",
+    "@fluidframework/telemetry-utils": "~2.101.0",
     "lz4js": "^0.2.0",
@@ -84,3 +84,3 @@ "uuid": "^11.1.0"
     "@biomejs/biome": "~2.4.5",
-    "@fluid-internal/mocha-test-setup": "~2.100.0",
+    "@fluid-internal/mocha-test-setup": "~2.101.0",
     "@fluid-tools/build-cli": "^0.65.0",
@@ -87,0 +87,0 @@ "@fluidframework/build-common": "^2.0.3",

src/packageVersion.ts

@@ -9,2 +9,2 @@ /*!
 export const pkgName = "@fluidframework/driver-utils";
-export const pkgVersion = "2.100.0";
+export const pkgVersion = "2.101.0";

src/parallelRequests.ts

@@ -8,2 +8,3 @@ /*!
 import type { ITelemetryBaseProperties } from "@fluidframework/core-interfaces";
+import { LogLevel } from "@fluidframework/core-interfaces";
 import { assert, Deferred } from "@fluidframework/core-utils/internal";
@@ -565,7 +566,13 @@ import type {
 
-	const telemetryEvent = PerformanceEvent.start(logger, {
-		eventName: "GetDeltas",
-		...propsTotal,
-		reason: scenarioName,
-	});
+	const telemetryEvent = PerformanceEvent.start(
+		logger,
+		{
+			eventName: "GetDeltas",
+			...propsTotal,
+			reason: scenarioName,
+		},
+		undefined, // markers
+		undefined, // emitLogs
+		LogLevel.info,
+	);
 
@@ -572,0 +579,0 @@ const manager = new ParallelRequests<ISequencedDocumentMessage>(

New alerts

Network access

Supply chain risk

This module accesses the network.

Found 1 instance in 1 package

Long strings

Supply chain risk

Contains long string literals, which may be a sign of obfuscated or packed code.

Found 1 instance in 1 package

Fixed alerts

Network access

Supply chain risk

This module accesses the network.

Found 1 instance in 1 package

Long strings

Supply chain risk

Contains long string literals, which may be a sign of obfuscated or packed code.

Found 1 instance in 1 package

Improved metrics

Total package byte prevSize

812588

0.12%

Lines of code

9620

0.14%

Dependency changes

• + Added

  @fluid-internal/client-utils@2.101.1
  (transitive)

• + Added

  @fluidframework/core-interfaces@2.101.1
  (transitive)

• + Added

  @fluidframework/core-utils@2.101.1
  (transitive)

• + Added

  @fluidframework/driver-definitions@2.101.1
  (transitive)

• + Added

  @fluidframework/telemetry-utils@2.101.1
  (transitive)

• - Removed

  @fluid-internal/client-utils@2.100.1
  (transitive)

• - Removed

  @fluidframework/core-interfaces@2.100.1
  (transitive)

• - Removed

  @fluidframework/core-utils@2.100.1
  (transitive)

• - Removed

  @fluidframework/driver-definitions@2.100.1
  (transitive)

• - Removed

  @fluidframework/telemetry-utils@2.100.1
  (transitive)

• Updated

  @fluid-internal/client-utils@~2.101.0

• Updated

  @fluidframework/core-interfaces@~2.101.0

• Updated

  @fluidframework/core-utils@~2.101.0

• Updated

  @fluidframework/driver-definitions@~2.101.0

• Updated

  @fluidframework/telemetry-utils@~2.101.0