feat: add requestHandler ctor pass through type

.changeset/sixty-fireants-pay.md

@@ -0,0 +1,7 @@
+---
+"@smithy/fetch-http-handler": minor
+"@smithy/node-http-handler": minor
+"@smithy/types": minor
+---
+
+move default fetch and http handler ctor types to the types package

packages/fetch-http-handler/src/fetch-http-handler.ts

@@ -1,32 +1,13 @@
 import { HttpHandler, HttpRequest, HttpResponse } from "@smithy/protocol-http";
 import { buildQueryString } from "@smithy/querystring-builder";
+import type { FetchHttpHandlerOptions } from "@smithy/types";
 import { HeaderBag, HttpHandlerOptions, Provider } from "@smithy/types";
 
 import { requestTimeout } from "./request-timeout";
 
 declare let AbortController: any;
 
-/**
- * Represents the http options that can be passed to a browser http client.
- */
-export interface FetchHttpHandlerOptions {
-  /**
-   * The number of milliseconds a request can take before being automatically
-   * terminated.
-   */
-  requestTimeout?: number;
-
-  /**
-   * Whether to allow the request to outlive the page. Default value is false.
-   *
-   * There may be limitations to the payload size, number of concurrent requests,
-   * request duration etc. when using keepalive in browsers.
-   *
-   * These may change over time, so look for up to date information about
-   * these limitations before enabling keepalive.
-   */
-  keepAlive?: boolean;
-}
+export { FetchHttpHandlerOptions };
 
 type FetchHttpHandlerConfig = FetchHttpHandlerOptions;
 
@@ -47,6 +28,19 @@ export class FetchHttpHandler implements HttpHandler<FetchHttpHandlerConfig> {
   private config?: FetchHttpHandlerConfig;
   private configProvider: Promise<FetchHttpHandlerConfig>;
 
+  /**
+   * @returns the input if it is an HttpHandler of any class,
+   * or instantiates a new instance of this handler.
+   */
+  public static create(instanceOrOptions?: HttpHandler<any> | FetchHttpHandlerConfig) {
+    if (typeof (instanceOrOptions as any)?.handle === "function") {
+      // is already an instance of HttpHandler.
+      return instanceOrOptions as HttpHandler<any>;
+    }
+    // input is ctor options or undefined.
+    return new FetchHttpHandler(instanceOrOptions as FetchHttpHandlerConfig);
+  }
+
   constructor(options?: FetchHttpHandlerOptions | Provider<FetchHttpHandlerOptions | undefined>) {
     if (typeof options === "function") {
       this.configProvider = options().then((opts) => opts || {});

packages/node-http-handler/src/node-http-handler.ts

@@ -1,5 +1,6 @@
 import { HttpHandler, HttpRequest, HttpResponse } from "@smithy/protocol-http";
 import { buildQueryString } from "@smithy/querystring-builder";
+import type { NodeHttpHandlerOptions } from "@smithy/types";
 import { HttpHandlerOptions, Provider } from "@smithy/types";
 import { Agent as hAgent, request as hRequest } from "http";
 import { Agent as hsAgent, request as hsRequest, RequestOptions } from "https";
@@ -11,35 +12,7 @@ import { setSocketKeepAlive } from "./set-socket-keep-alive";
 import { setSocketTimeout } from "./set-socket-timeout";
 import { writeRequestBody } from "./write-request-body";
 
-/**
- * Represents the http options that can be passed to a node http client.
- */
-export interface NodeHttpHandlerOptions {
-  /**
-   * The maximum time in milliseconds that the connection phase of a request
-   * may take before the connection attempt is abandoned.
-   *
-   * Defaults to 0, which disables the timeout.
-   */
-  connectionTimeout?: number;
-
-  /**
-   * The number of milliseconds a request can take before automatically being terminated.
-   * Defaults to 0, which disables the timeout.
-   */
-  requestTimeout?: number;
-
-  /**
-   * @deprecated Use {@link requestTimeout}
-   *
-   * The maximum time in milliseconds that a socket may remain idle before it
-   * is closed.
-   */
-  socketTimeout?: number;
-
-  httpAgent?: hAgent;
-  httpsAgent?: hsAgent;
-}
+export { NodeHttpHandlerOptions };
 
 interface ResolvedNodeHttpHandlerConfig {
   requestTimeout?: number;
@@ -57,6 +30,19 @@ export class NodeHttpHandler implements HttpHandler<NodeHttpHandlerOptions> {
   // Node http handler is hard-coded to http/1.1: https://github.com/nodejs/node/blob/ff5664b83b89c55e4ab5d5f60068fb457f1f5872/lib/_http_server.js#L286
   public readonly metadata = { handlerProtocol: "http/1.1" };
 
+  /**
+   * @returns the input if it is an HttpHandler of any class,
+   * or instantiates a new instance of this handler.
+   */
+  public static create(instanceOrOptions?: HttpHandler<any> | NodeHttpHandlerOptions) {
+    if (typeof (instanceOrOptions as any)?.handle === "function") {
+      // is already an instance of HttpHandler.
+      return instanceOrOptions as HttpHandler<any>;
+    }
+    // input is ctor options or undefined.
+    return new NodeHttpHandler(instanceOrOptions as NodeHttpHandlerOptions);
+  }
+
   constructor(options?: NodeHttpHandlerOptions | Provider<NodeHttpHandlerOptions | void>) {
     this.configProvider = new Promise((resolve, reject) => {
       if (typeof options === "function") {

packages/node-http-handler/src/node-http2-handler.ts

@@ -49,6 +49,19 @@ export class NodeHttp2Handler implements HttpHandler<NodeHttp2HandlerOptions> {
 
   private readonly connectionManager: NodeHttp2ConnectionManager = new NodeHttp2ConnectionManager({});
 
+  /**
+   * @returns the input if it is an HttpHandler of any class,
+   * or instantiates a new instance of this handler.
+   */
+  public static create(instanceOrOptions?: HttpHandler<any> | NodeHttp2HandlerOptions) {
+    if (typeof (instanceOrOptions as any)?.handle === "function") {
+      // is already an instance of HttpHandler.
+      return instanceOrOptions as HttpHandler<any>;
+    }
+    // input is ctor options or undefined.
+    return new NodeHttp2Handler(instanceOrOptions as NodeHttp2HandlerOptions);
+  }
+
   constructor(options?: NodeHttp2HandlerOptions | Provider<NodeHttp2HandlerOptions | void>) {
     this.configProvider = new Promise((resolve, reject) => {
       if (typeof options === "function") {

packages/types/src/http/httpHandlerInitialization.ts

@@ -0,0 +1,70 @@
+import type { Agent as hAgent } from "http";
+import type { Agent as hsAgent } from "https";
+
+/**
+ *
+ * This type represents an alternate client constructor option for the entry
+ * "requestHandler". Instead of providing an instance of a requestHandler, the user
+ * may provide the requestHandler's constructor options for either the
+ * NodeHttpHandler or FetchHttpHandler.
+ *
+ * For other RequestHandlers like HTTP2 or WebSocket,
+ * constructor parameter passthrough is not currently available.
+ *
+ * @public
+ */
+export type RequestHandlerParams = NodeHttpHandlerOptions | FetchHttpHandlerOptions;
+
+/**
+ * Represents the http options that can be passed to a node http client.
+ * @public
+ */
+export interface NodeHttpHandlerOptions {
+  /**
+   * The maximum time in milliseconds that the connection phase of a request
+   * may take before the connection attempt is abandoned.
+   *
+   * Defaults to 0, which disables the timeout.
+   */
+  connectionTimeout?: number;
+
+  /**
+   * The number of milliseconds a request can take before automatically being terminated.
+   * Defaults to 0, which disables the timeout.
+   */
+  requestTimeout?: number;
+
+  /**
+   * @deprecated Use {@link requestTimeout}
+   *
+   * The maximum time in milliseconds that a socket may remain idle before it
+   * is closed.
+   */
+  socketTimeout?: number;
+
+  httpAgent?: hAgent;
+  httpsAgent?: hsAgent;
+}
+
+/**
+ * Represents the http options that can be passed to a browser http client.
+ * @public
+ */
+export interface FetchHttpHandlerOptions {
+  /**
+   * The number of milliseconds a request can take before being automatically
+   * terminated.
+   */
+  requestTimeout?: number;
+
+  /**
+   * Whether to allow the request to outlive the page. Default value is false.
+   *
+   * There may be limitations to the payload size, number of concurrent requests,
+   * request duration etc. when using keepalive in browsers.
+   *
+   * These may change over time, so look for up to date information about
+   * these limitations before enabling keepalive.
+   */
+  keepAlive?: boolean;
+}

packages/types/src/index.ts

@@ -12,6 +12,7 @@ export * from "./endpoints";
 export * from "./eventStream";
 export * from "./extensions";
 export * from "./http";
+export * from "./http/httpHandlerInitialization";
 export * from "./identity";
 export * from "./logger";
 export * from "./middleware";