Initial

resources/app/node_modules/@smithy/node-http-handler/dist-es/node-http2-connection-manager.js

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+import http2 from "http2";
+import { NodeHttp2ConnectionPool } from "./node-http2-connection-pool";
+export class NodeHttp2ConnectionManager {
+    constructor(config) {
+        this.sessionCache = new Map();
+        this.config = config;
+        if (this.config.maxConcurrency && this.config.maxConcurrency <= 0) {
+            throw new RangeError("maxConcurrency must be greater than zero.");
+        }
+    }
+    lease(requestContext, connectionConfiguration) {
+        const url = this.getUrlString(requestContext);
+        const existingPool = this.sessionCache.get(url);
+        if (existingPool) {
+            const existingSession = existingPool.poll();
+            if (existingSession && !this.config.disableConcurrency) {
+                return existingSession;
+            }
+        }
+        const session = http2.connect(url);
+        if (this.config.maxConcurrency) {
+            session.settings({ maxConcurrentStreams: this.config.maxConcurrency }, (err) => {
+                if (err) {
+                    throw new Error("Fail to set maxConcurrentStreams to " +
+                        this.config.maxConcurrency +
+                        "when creating new session for " +
+                        requestContext.destination.toString());
+                }
+            });
+        }
+        session.unref();
+        const destroySessionCb = () => {
+            session.destroy();
+            this.deleteSession(url, session);
+        };
+        session.on("goaway", destroySessionCb);
+        session.on("error", destroySessionCb);
+        session.on("frameError", destroySessionCb);
+        session.on("close", () => this.deleteSession(url, session));
+        if (connectionConfiguration.requestTimeout) {
+            session.setTimeout(connectionConfiguration.requestTimeout, destroySessionCb);
+        }
+        const connectionPool = this.sessionCache.get(url) || new NodeHttp2ConnectionPool();
+        connectionPool.offerLast(session);
+        this.sessionCache.set(url, connectionPool);
+        return session;
+    }
+    deleteSession(authority, session) {
+        const existingConnectionPool = this.sessionCache.get(authority);
+        if (!existingConnectionPool) {
+            return;
+        }
+        if (!existingConnectionPool.contains(session)) {
+            return;
+        }
+        existingConnectionPool.remove(session);
+        this.sessionCache.set(authority, existingConnectionPool);
+    }
+    release(requestContext, session) {
+        const cacheKey = this.getUrlString(requestContext);
+        this.sessionCache.get(cacheKey)?.offerLast(session);
+    }
+    destroy() {
+        for (const [key, connectionPool] of this.sessionCache) {
+            for (const session of connectionPool) {
+                if (!session.destroyed) {
+                    session.destroy();
+                }
+                connectionPool.remove(session);
+            }
+            this.sessionCache.delete(key);
+        }
+    }
+    setMaxConcurrentStreams(maxConcurrentStreams) {
+        if (this.config.maxConcurrency && this.config.maxConcurrency <= 0) {
+            throw new RangeError("maxConcurrentStreams must be greater than zero.");
+        }
+        this.config.maxConcurrency = maxConcurrentStreams;
+    }
+    setDisableConcurrentStreams(disableConcurrentStreams) {
+        this.config.disableConcurrency = disableConcurrentStreams;
+    }
+    getUrlString(request) {
+        return request.destination.toString();
+    }
+}