@solana/rpc-transport-http - npm Package Compare versions

Comparing version 2.0.0-experimental.a2fc5a3 to 2.0.0-experimental.a64df70

package.json

 {
   "name": "@solana/rpc-transport-http",
-  "version": "2.0.0-experimental.a2fc5a3",
+  "version": "2.0.0-experimental.a64df70",
   "description": "An RPC transport that uses HTTP requests",
@@ -50,3 +50,3 @@ "exports": {
     "undici": "^6.6.2",
-    "@solana/rpc-spec": "2.0.0-experimental.a2fc5a3"
+    "@solana/rpc-spec": "2.0.0-experimental.a64df70"
   },
@@ -53,0 +53,0 @@ "bundlewatch": {

README.md

@@ -17,2 +17,229 @@ [![npm][npm-image]][npm-url]
 
-TODO
+This package allows developers to create custom RPC transports. With this library, one can implement highly specialized functionality for leveraging multiple transports, attempting/handling retries, and more.
+
+## Functions
+
+### `createHttpTransport()`
+
+Call this to create a function that conforms to the `RpcTransport` interface (see `@solana/rpc-spec`). You can use that function in your programs to make `POST` requests with headers suitable for sending JSON data to a server.
+
+```ts
+import { createHttpTransport } from '@solana/rpc-transport-http';
+
+const transport = createHttpTransport({ url: 'https://api.mainnet-beta.solana.com' });
+const response = await transport({
+    payload: { id: 1, jsonrpc: '2.0', method: 'getSlot' },
+});
+```
+
+#### Config
+
+##### `dispatcher_NODE_ONLY`
+
+In Node environments you can tune how requests are dispatched to the network. Use this config parameter to install a [`undici.Dispatcher`](https://undici.nodejs.org/#/docs/api/Agent) in your transport.
+
+```ts
+import { createHttpTransport } from '@solana/rpc-transport-http';
+import { Agent, BalancedPool } from 'undici';
+
+// Create a dispatcher that, when called with a special URL, creates a round-robin pool of RPCs.
+const dispatcher = new Agent({
+    factory(origin, opts) {
+        if (origin === 'https://mypool') {
+            const upstreams = [
+                'https://api.mainnet-beta.solana.com',
+                'https://mainnet.helius-rpc.com',
+                'https://several-neat-iguana.quiknode.pro',
+            ];
+            return new BalancedPool(upstreams, {
+                ...opts,
+                bodyTimeout: 60e3,
+                headersTimeout: 5e3,
+                keepAliveTimeout: 19e3,
+            });
+        } else {
+            return new Pool(origin, opts);
+        }
+    },
+});
+const transport = createHttpTransport({
+    dispatcher_NODE_ONLY: dispatcher,
+    url: 'https://mypool',
+});
+let id = 0;
+const balances = await Promise.allSettled(
+    accounts.map(account =>
+        transport({
+            payload: {
+                id: ++id,
+                jsonrpc: '2.0',
+                method: 'getBalance',
+                params: [account],
+            },
+        }),
+    ),
+);
+```
+
+##### `headers`
+
+An object of headers to set on the request. Avoid [forbidden headers](https://developer.mozilla.org/en-US/docs/Glossary/Forbidden_header_name). Additionally, the headers `Accept`, `Content-Length`, and `Content-Type` are disallowed.
+
+```ts
+import { createHttpTransport } from '@solana/rpc-transport-http';
+
+const transport = createHttpTransport({
+    headers: {
+        // Authorize with the RPC using a bearer token
+        Authorization: `Bearer ${process.env.RPC_AUTH_TOKEN}`,
+    },
+    url: 'https://several-neat-iguana.quiknode.pro',
+});
+```
+
+##### `url`
+
+A string representing the target endpoint. In Node, it must be an absolute URL using the `http` or `https` protocol.
+
+## Augmenting Transports
+
+Using this core transport, you can implement specialized functionality for leveraging multiple transports, attempting/handling retries, and more.
+
+### Round Robin
+
+Here’s an example of how someone might implement a “round robin” approach to distribute requests to multiple transports:
+
+```ts
+import { RpcTransport } from '@solana/rpc-spec';
+import { createHttpTransport } from '@solana/rpc-transport-http';
+
+// Create a transport for each RPC server
+const transports = [
+    createHttpTransport({ url: 'https://mainnet-beta.my-server-1.com' }),
+    createHttpTransport({ url: 'https://mainnet-beta.my-server-2.com' }),
+    createHttpTransport({ url: 'https://mainnet-beta.my-server-3.com' }),
+];
+
+// Create a wrapper transport that distributes requests to them
+let nextTransport = 0;
+async function roundRobinTransport<TResponse>(...args: Parameters<RpcTransport>): Promise<TResponse> {
+    const transport = transports[nextTransport];
+    nextTransport = (nextTransport + 1) % transports.length;
+    return await transport(...args);
+}
+```
+
+### Sharding
+
+Another example of a possible customization for a transport is to shard requests deterministically among a set of servers. Here’s an example:
+
+Perhaps your application needs to make a large number of requests, or needs to fan request for different methods out to different servers. Here’s an example of an implementation that does the latter:
+
+```ts
+import { RpcTransport } from '@solana/rpc-spec';
+import { createHttpTransport } from '@solana/rpc-transport-http';
+
+// Create multiple transports
+const transportA = createHttpTransport({ url: 'https://mainnet-beta.my-server-1.com' });
+const transportB = createHttpTransport({ url: 'https://mainnet-beta.my-server-2.com' });
+const transportC = createHttpTransport({ url: 'https://mainnet-beta.my-server-3.com' });
+const transportD = createHttpTransport({ url: 'https://mainnet-beta.my-server-4.com' });
+
+// Function to determine which shard to use based on the request method
+function selectShard(method: string): RpcTransport {
+    switch (method) {
+        case 'getAccountInfo':
+        case 'getBalance':
+            return transportA;
+        case 'getTransaction':
+        case 'getRecentBlockhash':
+            return transportB;
+        case 'sendTransaction':
+            return transportC;
+        default:
+            return transportD;
+    }
+}
+
+async function shardingTransport<TResponse>(...args: Parameters<RpcTransport>): Promise<TResponse> {
+    const payload = args[0].payload as { method: string };
+    const selectedTransport = selectShard(payload.method);
+    return await selectedTransport(...args);
+}
+```
+
+### Retry Logic
+
+The transport library can also be used to implement custom retry logic on any request:
+
+```ts
+import { RpcTransport } from '@solana/rpc-spec';
+import { createHttpTransport } from '@solana/rpc-transport-http';
+
+// Set the maximum number of attempts to retry a request
+const MAX_ATTEMPTS = 4;
+
+// Create the default transport
+const defaultTransport = createHttpTransport({ url: 'https://mainnet-beta.my-server-1.com' });
+
+// Sleep function to wait for a given number of milliseconds
+function sleep(ms: number): Promise<void> {
+    return new Promise(resolve => setTimeout(resolve, ms));
+}
+
+// Calculate the delay for a given attempt
+function calculateRetryDelay(attempt: number): number {
+    // Exponential backoff with a maximum of 1.5 seconds
+    return Math.min(100 * Math.pow(2, attempt), 1500);
+}
+
+// A retrying transport that will retry up to `MAX_ATTEMPTS` times before failing
+async function retryingTransport<TResponse>(...args: Parameters<RpcTransport>): Promise<TResponse> {
+    let requestError;
+    for (let attempts = 0; attempts < MAX_ATTEMPTS; attempts++) {
+        try {
+            return await defaultTransport(...args);
+        } catch (err) {
+            requestError = err;
+            // Only sleep if we have more attempts remaining
+            if (attempts < MAX_ATTEMPTS - 1) {
+                const retryDelay = calculateRetryDelay(attempts);
+                await sleep(retryDelay);
+            }
+        }
+    }
+    throw requestError;
+}
+```
+
+### Failover
+
+Here’s an example of some failover logic integrated into a transport:
+
+```ts
+import { RpcTransport } from '@solana/rpc-spec';
+import { createHttpTransport } from '@solana/rpc-transport-http';
+
+// Create a transport for each RPC server
+const transports = [
+    createHttpTransport({ url: 'https://mainnet-beta.my-server-1.com' }),
+    createHttpTransport({ url: 'https://mainnet-beta.my-server-2.com' }),
+    createHttpTransport({ url: 'https://mainnet-beta.my-server-2.com' }),
+];
+
+// A failover transport that will try each transport in order until one succeeds before failing
+async function failoverTransport<TResponse>(...args: Parameters<RpcTransport>): Promise<TResponse> {
+    let requestError;
+
+    for (const transport of transports) {
+        try {
+            return await transport(...args);
+        } catch (err) {
+            requestError = err;
+            console.error(err);
+        }
+    }
+    throw requestError;
+}
+
+```

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Number of lines in readme file

245

increased by1261.11%

Dependency changes

• + Added@solana/rpc-spec@2.0.0-experimental.a64df70(transitive)

• + Added@solana/rpc-spec-types@2.0.0-experimental.a64df70(transitive)

• - Removed@solana/rpc-spec@2.0.0-experimental.a2fc5a3(transitive)

• - Removed@solana/rpc-spec-types@2.0.0-experimental.a2fc5a3(transitive)

• Updated@solana/rpc-spec@2.0.0-experimental.a64df70