@bytecodealliance/preview2-shim - npm Package Compare versions

Comparing version 0.17.7 to 0.17.8

lib/browser/clocks.js

@@ -0,1 +1,4 @@
+import { poll } from './io.js';
+const { Pollable } = poll;
+
 export const monotonicClock = {
@@ -13,11 +16,12 @@ resolution() {
         instant = BigInt(instant);
-        const now = this.now();
+        const now = monotonicClock.now();
         if (instant <= now) {
-            return this.subscribeDuration(0);
+            return new Pollable(new Promise(resolve => setTimeout(resolve, 0)));
         }
-        return this.subscribeDuration(instant - now);
+        return monotonicClock.subscribeDuration(instant - now);
     },
-    subscribeDuration(_duration) {
-        _duration = BigInt(_duration);
-        console.log(`[monotonic-clock] subscribe`);
+    subscribeDuration(duration) {
+        duration = BigInt(duration);
+        const ms = duration <= 0n ? 0 : Number(duration / 1_000_000n);
+        return new Pollable(new Promise(resolve => setTimeout(resolve, ms)));
     },
@@ -24,0 +28,0 @@ };

lib/browser/http.js

@@ -1,45 +0,676 @@
-/**
- * @param {import("../../types/interfaces/wasi-http-types").Request} req
- * @returns {string}
- */
-export function send(req) {
-    console.log(`[http] Send (browser) ${req.uri}`);
-    try {
-        const xhr = new XMLHttpRequest();
-        xhr.open(req.method.toString(), req.uri, false);
-        const requestHeaders = new Headers(req.headers);
-        for (let [name, value] of requestHeaders.entries()) {
-            if (name !== 'user-agent' && name !== 'host') {
-                xhr.setRequestHeader(name, value);
+import { streams, poll } from './io.js';
+
+const { InputStream, OutputStream } = streams;
+const { Pollable } = poll;
+
+const symbolDispose = Symbol.dispose || Symbol.for('dispose');
+const utf8Decoder = new TextDecoder();
+const forbiddenHeaders = new Set(['connection', 'keep-alive', 'host']);
+const DEFAULT_HTTP_TIMEOUT_NS = 600_000_000_000n;
+
+// RFC 9110 compliant header validation
+const TOKEN_RE = /^[!#$%&'*+\-.^_`|~0-9A-Za-z]+$/;
+const FIELD_VALUE_RE = /^[\t\x20-\x7E\x80-\xFF]*$/;
+
+function validateHeaderName(name) {
+    if (!TOKEN_RE.test(name)) {
+        throw { tag: 'invalid-syntax' };
+    }
+}
+
+function validateHeaderValue(value) {
+    const str = typeof value === 'string' ? value : utf8Decoder.decode(value);
+    if (!FIELD_VALUE_RE.test(str)) {
+        throw { tag: 'invalid-syntax' };
+    }
+}
+
+class Fields {
+    #immutable = false;
+    /** @type {[string, Uint8Array][]} */ #entries = [];
+    /** @type {Map<string, [string, Uint8Array][]>} */ #table = new Map();
+
+    static fromList(entries) {
+        const fields = new Fields();
+        for (const [key, value] of entries) {
+            fields.append(key, value);
+        }
+        return fields;
+    }
+
+    get(name) {
+        const tableEntries = this.#table.get(name.toLowerCase());
+        if (!tableEntries) {
+            return [];
+        }
+        return tableEntries.map(([, v]) => v);
+    }
+
+    set(name, values) {
+        if (this.#immutable) {
+            throw { tag: 'immutable' };
+        }
+        validateHeaderName(name);
+        for (const value of values) {
+            validateHeaderValue(value);
+        }
+        const lowercased = name.toLowerCase();
+        if (forbiddenHeaders.has(lowercased)) {
+            throw { tag: 'forbidden' };
+        }
+        const tableEntries = this.#table.get(lowercased);
+        if (tableEntries) {
+            this.#entries = this.#entries.filter(
+                (entry) => !tableEntries.includes(entry)
+            );
+            tableEntries.splice(0, tableEntries.length);
+        } else {
+            this.#table.set(lowercased, []);
+        }
+        const newTableEntries = this.#table.get(lowercased);
+        for (const value of values) {
+            const entry = [name, value];
+            this.#entries.push(entry);
+            newTableEntries.push(entry);
+        }
+    }
+
+    has(name) {
+        return this.#table.has(name.toLowerCase());
+    }
+
+    delete(name) {
+        if (this.#immutable) {
+            throw { tag: 'immutable' };
+        }
+        const lowercased = name.toLowerCase();
+        const tableEntries = this.#table.get(lowercased);
+        if (tableEntries) {
+            this.#entries = this.#entries.filter(
+                (entry) => !tableEntries.includes(entry)
+            );
+            this.#table.delete(lowercased);
+        }
+    }
+
+    append(name, value) {
+        if (this.#immutable) {
+            throw { tag: 'immutable' };
+        }
+        validateHeaderName(name);
+        validateHeaderValue(value);
+        const lowercased = name.toLowerCase();
+        if (forbiddenHeaders.has(lowercased)) {
+            throw { tag: 'forbidden' };
+        }
+        const entry = [name, value];
+        this.#entries.push(entry);
+        const tableEntries = this.#table.get(lowercased);
+        if (tableEntries) {
+            tableEntries.push(entry);
+        } else {
+            this.#table.set(lowercased, [entry]);
+        }
+    }
+
+    entries() {
+        return this.#entries;
+    }
+
+    clone() {
+        return fieldsFromEntriesChecked(this.#entries);
+    }
+
+    static _lock(fields) {
+        fields.#immutable = true;
+        return fields;
+    }
+
+    static _fromEntriesChecked(entries) {
+        const fields = new Fields();
+        fields.#entries = entries;
+        for (const entry of entries) {
+            const lowercase = entry[0].toLowerCase();
+            const existing = fields.#table.get(lowercase);
+            if (existing) {
+                existing.push(entry);
+            } else {
+                fields.#table.set(lowercase, [entry]);
             }
         }
-        xhr.send(req.body && req.body.length > 0 ? req.body : null);
-        const body = xhr.response
-            ? new TextEncoder().encode(xhr.response)
-            : undefined;
-        const headers = [];
-        xhr.getAllResponseHeaders()
-            .trim()
-            .split(/[\r\n]+/)
-            .forEach((line) => {
-                var parts = line.split(': ');
-                var key = parts.shift();
-                var value = parts.join(': ');
-                headers.push([key, value]);
-            });
+        return fields;
+    }
+}
+const fieldsLock = Fields._lock;
+delete Fields._lock;
+const fieldsFromEntriesChecked = Fields._fromEntriesChecked;
+delete Fields._fromEntriesChecked;
+
+class RequestOptions {
+    #connectTimeout = DEFAULT_HTTP_TIMEOUT_NS;
+    #firstByteTimeout = DEFAULT_HTTP_TIMEOUT_NS;
+    #betweenBytesTimeout = DEFAULT_HTTP_TIMEOUT_NS;
+    connectTimeout() {
+        return this.#connectTimeout;
+    }
+    setConnectTimeout(duration) {
+        if (duration < 0n) {
+            throw new Error('duration must not be negative');
+        }
+        this.#connectTimeout = duration;
+    }
+    firstByteTimeout() {
+        return this.#firstByteTimeout;
+    }
+    setFirstByteTimeout(duration) {
+        if (duration < 0n) {
+            throw new Error('duration must not be negative');
+        }
+        this.#firstByteTimeout = duration;
+    }
+    betweenBytesTimeout() {
+        return this.#betweenBytesTimeout;
+    }
+    setBetweenBytesTimeout(duration) {
+        if (duration < 0n) {
+            throw new Error('duration must not be negative');
+        }
+        this.#betweenBytesTimeout = duration;
+    }
+}
+
+class OutgoingBody {
+    #outputStream = null;
+    #chunks = [];
+    #finished = false;
+
+    write() {
+        const outputStream = this.#outputStream;
+        if (outputStream === null) {
+            throw undefined;
+        }
+        this.#outputStream = null;
+        return outputStream;
+    }
+
+    static finish(body, trailers) {
+        if (trailers) {
+            throw { tag: 'internal-error', val: 'trailers unsupported' };
+        }
+        if (body.#finished) {
+            throw { tag: 'internal-error', val: 'body already finished' };
+        }
+        body.#finished = true;
+    }
+
+    static _bodyData(outgoingBody) {
+        if (outgoingBody.#chunks.length === 0) {
+            return null;
+        }
+        let totalLen = 0;
+        for (const chunk of outgoingBody.#chunks) {
+            totalLen += chunk.byteLength;
+        }
+        const result = new Uint8Array(totalLen);
+        let offset = 0;
+        for (const chunk of outgoingBody.#chunks) {
+            result.set(chunk, offset);
+            offset += chunk.byteLength;
+        }
+        return result;
+    }
+
+    static _create() {
+        const outgoingBody = new OutgoingBody();
+        const chunks = outgoingBody.#chunks;
+        outgoingBody.#outputStream = new OutputStream({
+            write(buf) {
+                chunks.push(new Uint8Array(buf));
+            },
+            flush() {},
+            blockingFlush() {},
+            subscribe() {
+                return new Pollable();
+            },
+        });
+        return outgoingBody;
+    }
+
+    [symbolDispose]() {}
+}
+const outgoingBodyCreate = OutgoingBody._create;
+delete OutgoingBody._create;
+const outgoingBodyData = OutgoingBody._bodyData;
+delete OutgoingBody._bodyData;
+
+class OutgoingRequest {
+    /** @type {{ tag: string, val?: string }} */ #method = { tag: 'get' };
+    /** @type {{ tag: string, val?: string } | undefined} */ #scheme = undefined;
+    /** @type {string | undefined} */ #pathWithQuery = undefined;
+    /** @type {string | undefined} */ #authority = undefined;
+    /** @type {Fields} */ #headers;
+    /** @type {OutgoingBody} */ #body;
+    #bodyRequested = false;
+
+    constructor(headers) {
+        fieldsLock(headers);
+        this.#headers = headers;
+        this.#body = outgoingBodyCreate();
+    }
+
+    body() {
+        if (this.#bodyRequested) {
+            throw new Error('Body already requested');
+        }
+        this.#bodyRequested = true;
+        return this.#body;
+    }
+
+    method() {
+        return this.#method;
+    }
+
+    setMethod(method) {
+        if (method.tag === 'other' && !method.val.match(/^[a-zA-Z-]+$/)) {
+            throw undefined;
+        }
+        this.#method = method;
+    }
+
+    pathWithQuery() {
+        return this.#pathWithQuery;
+    }
+
+    setPathWithQuery(pathWithQuery) {
+        if (
+            pathWithQuery &&
+            !pathWithQuery.match(/^[a-zA-Z0-9.\-_~!$&'()*+,;=:@%?/]+$/)
+        ) {
+            throw undefined;
+        }
+        this.#pathWithQuery = pathWithQuery;
+    }
+
+    scheme() {
+        return this.#scheme;
+    }
+
+    setScheme(scheme) {
+        if (scheme?.tag === 'other' && !scheme.val.match(/^[a-zA-Z]+$/)) {
+            throw undefined;
+        }
+        this.#scheme = scheme;
+    }
+
+    authority() {
+        return this.#authority;
+    }
+
+    setAuthority(authority) {
+        if (authority) {
+            const [host, port, ...extra] = authority.split(':');
+            const portNum = Number(port);
+            if (
+                extra.length ||
+                (port !== undefined &&
+                    (portNum.toString() !== port || portNum > 65535)) ||
+                !host.match(/^[a-zA-Z0-9-.]+$/)
+            ) {
+                throw undefined;
+            }
+        }
+        this.#authority = authority;
+    }
+
+    headers() {
+        return this.#headers;
+    }
+
+    [symbolDispose]() {}
+
+    static _handle(request, options) {
+        const scheme = schemeString(request.#scheme);
+        const method = request.#method.val || request.#method.tag;
+
+        if (!request.#pathWithQuery) {
+            throw { tag: 'HTTP-request-URI-invalid' };
+        }
+
+        const url = `${scheme}//${request.#authority || ''}${request.#pathWithQuery}`;
+
+        const headers = new Headers();
+        for (const [key, value] of request.#headers.entries()) {
+            const lowerKey = key.toLowerCase();
+            if (!forbiddenHeaders.has(lowerKey)) {
+                headers.set(key, utf8Decoder.decode(value));
+            }
+        }
+
+        const bodyData = outgoingBodyData(request.#body);
+
+        let timeoutMs = Number(DEFAULT_HTTP_TIMEOUT_NS / 1_000_000n);
+        if (options) {
+            const ct = options.connectTimeout?.() ?? DEFAULT_HTTP_TIMEOUT_NS;
+            const fbt = options.firstByteTimeout?.() ?? DEFAULT_HTTP_TIMEOUT_NS;
+            const minTimeout = ct < fbt ? ct : fbt;
+            timeoutMs = Number(minTimeout / 1_000_000n);
+        }
+
+        return futureIncomingResponseCreate(
+            url, method.toUpperCase(), headers, bodyData, timeoutMs
+        );
+    }
+}
+const outgoingRequestHandle = OutgoingRequest._handle;
+delete OutgoingRequest._handle;
+
+class IncomingBody {
+    #finished = false;
+    #stream = undefined;
+
+    stream() {
+        if (!this.#stream) {
+            throw undefined;
+        }
+        const stream = this.#stream;
+        this.#stream = null;
+        return stream;
+    }
+
+    static finish(incomingBody) {
+        if (incomingBody.#finished) {
+            throw new Error('incoming body already finished');
+        }
+        incomingBody.#finished = true;
+        return futureTrailersCreate();
+    }
+
+    [symbolDispose]() {}
+
+    static _create(fetchResponse) {
+        const incomingBody = new IncomingBody();
+        let buffer = null;
+        let bufferOffset = 0;
+        let done = false;
+        let reader = null;
+        let readPromise = null;
+
+        function ensureReader() {
+            if (!reader && fetchResponse.body) {
+                reader = fetchResponse.body.getReader();
+            }
+        }
+
+        function startRead() {
+            if (readPromise || done) { return; }
+            ensureReader();
+            if (!reader) {
+                done = true;
+                return;
+            }
+            readPromise = reader.read().then(
+                (result) => {
+                    readPromise = null;
+                    if (result.done) {
+                        done = true;
+                    } else {
+                        buffer = result.value;
+                        bufferOffset = 0;
+                    }
+                },
+                () => {
+                    readPromise = null;
+                    done = true;
+                }
+            );
+        }
+
+        incomingBody.#stream = new InputStream({
+            read(len) {
+                if (done && (buffer === null || bufferOffset >= buffer.byteLength)) {
+                    throw { tag: 'closed' };
+                }
+                if (buffer !== null && bufferOffset < buffer.byteLength) {
+                    const available = buffer.byteLength - bufferOffset;
+                    const toRead = Math.min(Number(len), available);
+                    const slice = buffer.slice(bufferOffset, bufferOffset + toRead);
+                    bufferOffset += toRead;
+                    if (bufferOffset >= buffer.byteLength) {
+                        buffer = null;
+                        bufferOffset = 0;
+                        if (!done) { startRead(); }
+                    }
+                    return slice;
+                }
+                throw { tag: 'would-block' };
+            },
+            blockingRead(len) {
+                if (done && (buffer === null || bufferOffset >= buffer.byteLength)) {
+                    throw { tag: 'closed' };
+                }
+                if (buffer !== null && bufferOffset < buffer.byteLength) {
+                    const available = buffer.byteLength - bufferOffset;
+                    const toRead = Math.min(Number(len), available);
+                    const slice = buffer.slice(bufferOffset, bufferOffset + toRead);
+                    bufferOffset += toRead;
+                    if (bufferOffset >= buffer.byteLength) {
+                        buffer = null;
+                        bufferOffset = 0;
+                        if (!done) { startRead(); }
+                    }
+                    return slice;
+                }
+                startRead();
+                const waitFor = readPromise || Promise.resolve();
+                return waitFor.then(() => {
+                    if (done && (buffer === null || bufferOffset >= buffer.byteLength)) {
+                        throw { tag: 'closed' };
+                    }
+                    if (buffer !== null && bufferOffset < buffer.byteLength) {
+                        const available = buffer.byteLength - bufferOffset;
+                        const toRead = Math.min(Number(len), available);
+                        const slice = buffer.slice(bufferOffset, bufferOffset + toRead);
+                        bufferOffset += toRead;
+                        if (bufferOffset >= buffer.byteLength) {
+                            buffer = null;
+                            bufferOffset = 0;
+                            if (!done) { startRead(); }
+                        }
+                        return slice;
+                    }
+                    throw { tag: 'closed' };
+                });
+            },
+            subscribe() {
+                if (done || (buffer !== null && bufferOffset < buffer.byteLength)) {
+                    return new Pollable();
+                }
+                startRead();
+                if (readPromise) {
+                    return new Pollable(readPromise);
+                }
+                return new Pollable();
+            },
+        });
+
+        startRead();
+        return incomingBody;
+    }
+}
+const incomingBodyCreate = IncomingBody._create;
+delete IncomingBody._create;
+
+class IncomingResponse {
+    /** @type {Fields} */ #headers = undefined;
+    #status = 0;
+    /** @type {IncomingBody} */ #body;
+
+    status() {
+        return this.#status;
+    }
+
+    headers() {
+        return this.#headers;
+    }
+
+    consume() {
+        if (this.#body === undefined) {
+            throw undefined;
+        }
+        const body = this.#body;
+        this.#body = undefined;
+        return body;
+    }
+
+    [symbolDispose]() {}
+
+    static _create(fetchResponse) {
+        const res = new IncomingResponse();
+        res.#status = fetchResponse.status;
+
+        const headerEntries = [];
+        const encoder = new TextEncoder();
+        fetchResponse.headers.forEach((value, key) => {
+            headerEntries.push([key, encoder.encode(value)]);
+        });
+        res.#headers = fieldsLock(fieldsFromEntriesChecked(headerEntries));
+        res.#body = incomingBodyCreate(fetchResponse);
+        return res;
+    }
+}
+const incomingResponseCreate = IncomingResponse._create;
+delete IncomingResponse._create;
+
+class FutureTrailers {
+    #requested = false;
+    subscribe() {
+        return new Pollable();
+    }
+    get() {
+        if (this.#requested) {
+            return { tag: 'err' };
+        }
+        this.#requested = true;
         return {
-            status: xhr.status,
+            tag: 'ok',
+            val: {
+                tag: 'ok',
+                val: undefined,
+            },
+        };
+    }
+    static _create() {
+        return new FutureTrailers();
+    }
+}
+const futureTrailersCreate = FutureTrailers._create;
+delete FutureTrailers._create;
+
+function mapFetchError(err) {
+    if (err.name === 'AbortError') {
+        return { tag: 'connection-timeout' };
+    }
+    if (err.name === 'TypeError') {
+        return { tag: 'connection-refused' };
+    }
+    return { tag: 'internal-error', val: err.message };
+}
+
+class FutureIncomingResponse {
+    #result = undefined;
+    #promise = null;
+
+    subscribe() {
+        return new Pollable(this.#promise);
+    }
+
+    get() {
+        if (this.#result === undefined) {
+            return undefined;
+        }
+        const result = this.#result;
+        this.#result = { tag: 'err' };
+        return result;
+    }
+
+    [symbolDispose]() {
+        this.#promise = null;
+    }
+
+    static _create(url, method, headers, bodyData, timeoutMs) {
+        const future = new FutureIncomingResponse();
+
+        const controller = new AbortController();
+        let timer;
+        if (timeoutMs < Infinity) {
+            timer = setTimeout(() => controller.abort(), timeoutMs);
+        }
+
+        const init = {
+            method,
             headers,
-            body,
+            signal: controller.signal,
         };
-    } catch (err) {
-        throw new Error(err.message);
+        if (bodyData && method !== 'GET' && method !== 'HEAD') {
+            init.body = bodyData;
+        }
+
+        future.#promise = fetch(url, init).then(
+            (response) => {
+                if (timer) { clearTimeout(timer); }
+                future.#result = {
+                    tag: 'ok',
+                    val: {
+                        tag: 'ok',
+                        val: incomingResponseCreate(response),
+                    },
+                };
+            },
+            (err) => {
+                if (timer) { clearTimeout(timer); }
+                future.#result = {
+                    tag: 'ok',
+                    val: {
+                        tag: 'err',
+                        val: mapFetchError(err),
+                    },
+                };
+            }
+        );
+
+        return future;
     }
 }
+const futureIncomingResponseCreate = FutureIncomingResponse._create;
+delete FutureIncomingResponse._create;
 
-export const incomingHandler = {
-    handle() {},
+function schemeString(scheme) {
+    if (!scheme) {
+        return 'https:';
+    }
+    switch (scheme.tag) {
+    case 'HTTP':
+        return 'http:';
+    case 'HTTPS':
+        return 'https:';
+    case 'other':
+        return scheme.val.toLowerCase() + ':';
+    }
+}
+
+function httpErrorCode(err) {
+    if (err.payload) {
+        return err.payload;
+    }
+    return {
+        tag: 'internal-error',
+        val: err.message,
+    };
+}
+
+export const outgoingHandler = {
+    handle: outgoingRequestHandle,
 };
 
-export const outgoingHandler = {
+export const incomingHandler = {
     handle() {},
@@ -49,108 +680,14 @@ };
 export const types = {
-    dropFields(_fields) {
-        console.log('[types] Drop fields');
-    },
-    newFields(_entries) {
-        console.log('[types] New fields');
-    },
-    fieldsGet(_fields, _name) {
-        console.log('[types] Fields get');
-    },
-    fieldsSet(_fields, _name, _value) {
-        console.log('[types] Fields set');
-    },
-    fieldsDelete(_fields, _name) {
-        console.log('[types] Fields delete');
-    },
-    fieldsAppend(_fields, _name, _value) {
-        console.log('[types] Fields append');
-    },
-    fieldsEntries(_fields) {
-        console.log('[types] Fields entries');
-    },
-    fieldsClone(_fields) {
-        console.log('[types] Fields clone');
-    },
-    finishIncomingStream(s) {
-        console.log(`[types] Finish incoming stream ${s}`);
-    },
-    finishOutgoingStream(s, _trailers) {
-        console.log(`[types] Finish outgoing stream ${s}`);
-    },
-    dropIncomingRequest(_req) {
-        console.log('[types] Drop incoming request');
-    },
-    dropOutgoingRequest(_req) {
-        console.log('[types] Drop outgoing request');
-    },
-    incomingRequestMethod(_req) {
-        console.log('[types] Incoming request method');
-    },
-    incomingRequestPathWithQuery(_req) {
-        console.log('[types] Incoming request path with query');
-    },
-    incomingRequestScheme(_req) {
-        console.log('[types] Incoming request scheme');
-    },
-    incomingRequestAuthority(_req) {
-        console.log('[types] Incoming request authority');
-    },
-    incomingRequestHeaders(_req) {
-        console.log('[types] Incoming request headers');
-    },
-    incomingRequestConsume(_req) {
-        console.log('[types] Incoming request consume');
-    },
-    newOutgoingRequest(_method, _pathWithQuery, _scheme, _authority, _headers) {
-        console.log('[types] New outgoing request');
-    },
-    outgoingRequestWrite(_req) {
-        console.log('[types] Outgoing request write');
-    },
-    dropResponseOutparam(_res) {
-        console.log('[types] Drop response outparam');
-    },
-    setResponseOutparam(_response) {
-        console.log('[types] Drop fields');
-    },
-    dropIncomingResponse(_res) {
-        console.log('[types] Drop incoming response');
-    },
-    dropOutgoingResponse(_res) {
-        console.log('[types] Drop outgoing response');
-    },
-    incomingResponseStatus(_res) {
-        console.log('[types] Incoming response status');
-    },
-    incomingResponseHeaders(_res) {
-        console.log('[types] Incoming response headers');
-    },
-    incomingResponseConsume(_res) {
-        console.log('[types] Incoming response consume');
-    },
-    newOutgoingResponse(_statusCode, _headers) {
-        console.log('[types] New outgoing response');
-    },
-    outgoingResponseWrite(_res) {
-        console.log('[types] Outgoing response write');
-    },
-    dropFutureIncomingResponse(_f) {
-        console.log('[types] Drop future incoming response');
-    },
-    futureIncomingResponseGet(_f) {
-        console.log('[types] Future incoming response get');
-    },
-    listenToFutureIncomingResponse(_f) {
-        console.log('[types] Listen to future incoming response');
-    },
-    Fields: class Fields {},
-    FutureIncomingResponse: new class FutureIncomingResponse {},
-    IncomingBody: new class IncomingBody {},
-    IncomingRequest: new class IncomingRequest {},
-    IncomingResponse: new class IncomingResponse {},
-    OutgoingBody: new class OutgoingBody {},
-    OutgoingRequest: new class OutgoingRequest {},
-    OutgoingResponse: new class OutgoingResponse {},
-    RequestOptions: new class RequestOptions {},
-    ResponseOutparam: new class ResponseOutparam {},
+    Fields,
+    FutureIncomingResponse,
+    FutureTrailers,
+    IncomingBody,
+    IncomingRequest: class IncomingRequest {},
+    IncomingResponse,
+    OutgoingBody,
+    OutgoingRequest,
+    OutgoingResponse: class OutgoingResponse {},
+    ResponseOutparam: class ResponseOutparam {},
+    RequestOptions,
+    httpErrorCode,
 };

lib/browser/io.js

@@ -80,3 +80,5 @@ let id = 0;
     subscribe() {
-        console.log(`[streams] Subscribe to input stream ${this.id}`);
+        if (this.handler.subscribe) {
+            return this.handler.subscribe();
+        }
         return new Pollable();
@@ -172,3 +174,5 @@ }
     subscribe() {
-        console.log(`[streams] Subscribe to output stream ${this.id}`);
+        if (this.handler.subscribe) {
+            return this.handler.subscribe();
+        }
         return new Pollable();
@@ -183,12 +187,68 @@ }
 
-class Pollable {}
+class Pollable {
+    #ready = false;
+    #promise = null;
 
-function pollList(_list) {
-    // TODO
+    constructor(promise) {
+        if (!promise) {
+            this.#ready = true;
+        } else {
+            this.#promise = promise.then(
+                () => { this.#ready = true; },
+                () => { this.#ready = true; }
+            );
+        }
+    }
+
+    ready() {
+        return this.#ready;
+    }
+
+    block() {
+        if (this.#ready) {
+            return Promise.resolve();
+        }
+        return this.#promise;
+    }
+
+    [symbolDispose]() {
+        this.#promise = null;
+    }
 }
 
-function pollOne(_poll) {
-    // TODO
+function pollList(list) {
+    if (list.length === 0) {
+        throw new Error('poll list must not be empty');
+    }
+    if (list.length > 0xFFFFFFFF) {
+        throw new Error('poll list length exceeds u32 index range');
+    }
+    const ready = [];
+    for (let i = 0; i < list.length; i++) {
+        if (list[i].ready()) {
+            ready.push(i);
+        }
+    }
+    if (ready.length > 0) {
+        return new Uint32Array(ready);
+    }
+    // None ready synchronously. Wait for the first to resolve via Promise.race,
+    // then sweep for any others that became ready concurrently.
+    return Promise.race(
+        list.map((p, i) => p.block().then(() => {
+            const result = [i];
+            for (let j = 0; j < list.length; j++) {
+                if (j !== i && list[j].ready()) {
+                    result.push(j);
+                }
+            }
+            return new Uint32Array(result);
+        }))
+    );
 }
 
+function pollOne(poll) {
+    return poll.block();
+}
+
 export const poll = {
@@ -198,3 +258,3 @@ Pollable,
     pollOne,
-    poll: pollOne,
+    poll: pollList,
 };

package.json

 {
   "name": "@bytecodealliance/preview2-shim",
-  "version": "0.17.7",
+  "version": "0.17.8",
   "description": "WASI Preview2 shim for JS environments",
@@ -5,0 +5,0 @@ "author": "Guy Bedford, Eduardo Rodrigues<[e-mail]>",

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

URL strings

Supply chain risk

Package contains fragments of external URLs or IP addresses, which the package may be accessing at runtime.

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

URL strings

Supply chain risk

Package contains fragments of external URLs or IP addresses, which the package may be accessing at runtime.

Found 1 instance in 1 package

Improved metrics

Total package byte prevSize

378673

4.53%

Lines of code

10745

5.13%

Worsened metrics

Number of low supply chain risk alerts

33

10%

Number of medium supply chain risk alerts

3

50%

No dependency changes