feat(util-create-request): create request package

packages/service-types-generator/src/internalImports.ts

@@ -424,6 +424,10 @@ export const IMPORTS: { [key: string]: Import } = {
     package: "@aws-sdk/util-buffer-from",
     version: "^0.1.0-preview.1"
   },
+  "util-create-request": {
+    package: "@aws-sdk/util-create-request",
+    version: "^0.1.0-preview.1"
+  },
   "util-error-constructor": {
     package: "@aws-sdk/util-error-constructor",
     version: "^0.1.0-preview.3"

packages/types/src/command.ts

@@ -37,6 +37,7 @@ export interface Command<
 > {
   readonly input: InputType;
   readonly model: OperationModel;
+  readonly middlewareStack: MiddlewareStack<InputType, OutputType, StreamType>;
   resolveMiddleware(
     stack: MiddlewareStack<ClientInput, ClientOutput, StreamType>,
     configuration: ResolvedConfiguration

packages/types/src/middleware.ts

@@ -269,6 +269,14 @@ export interface MiddlewareStack<
    */
   clone(): MiddlewareStack<Input, Output, Stream>;
 
+  /**
+   * same to clone, but only filter in middlewares when evaluation callback
+   * function returns true.
+   */
+  filter(
+    callbackfn: (middlewareStats: HandlerOptions) => boolean
+  ): MiddlewareStack<Input, Output, Stream>;
+
   /**
    * Create a list containing the middlewares in this list as well as the
    * middlewares in the `from` list. Neither source is modified, and step

packages/util-create-request/.gitignore

@@ -0,0 +1,7 @@
+/node_modules/
+/build/
+/coverage/
+/docs/
+*.tgz
+*.log
+package-lock.json

packages/util-create-request/.npmignore

@@ -0,0 +1,12 @@
+/src/
+/coverage/
+/docs/
+tsconfig.test.json
+
+*.spec.js
+*.spec.d.ts
+*.spec.js.map
+
+*.fixture.js
+*.fixture.d.ts
+*.fixture.js.map

packages/util-create-request/LICENSE

@@ -0,0 +1,201 @@
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packages/util-create-request/README.md

@@ -0,0 +1,81 @@
+# @aws-sdk/util-create-request
+
+This package provides function to create request object from given client and command.
+You can supply either Node client or browser client. A common use case for it can be
+generating request object and then supply to presigners to create presigned url.
+
+When calling the `createRequest()`, the `initialize` and `serialize` middlewares
+from both client and command are extracted and resolved into a handler. This handler
+will return a promise of `HttpRequest` object. So any modifications happen in `build`
+and `finalize` middleware won't be reflected to generated `httpRequest` object. For
+example, the `Content-Length` header won't be included in the result.
+
+Import:
+
+```javascript
+//JavaScript:
+const createRequest = require("@aws-sdk/util-create-request").createRequest;
+//TypeScript:
+import { createRequest } from "@aws-sdk/util-create-request";
+```
+
+JavaScript usage examples:
+
+```javascript
+const S3Client = require("@aws-sdk/client-s3-node/S3Client").S3Client;
+const GetObject = require("@aws-sdk/client-s3-node/commands/GetObjectCommand")
+  .GetObjectCommand;
+
+const request = await createRequest(
+  new S3Client({}),
+  new GetObject({
+    Bucket: "bucket",
+    Key: "key"
+  })
+);
+/**
+{ 
+  protocol: 'https:',
+  path: '/js-sdk-test-bucket/key',
+  hostname: 's3.us-east-2.amazonaws.com',
+  body: null,
+  headers: {},
+  method: 'GET',
+  query: {} 
+}
+*/
+```
+
+TypeScript usage example:
+
+```typescript
+import { S3Client } from "@aws-sdk/client-s3-node/S3Client";
+import { GetObjectCommand } from "@aws-sdk/client-s3-node/commands/GetObjectCommand";
+import { InputTypesUnion, GetObjectInput } from "@aws-sdk/client-s3-node/types";
+import { Readable } from "stream";
+
+const request = await createRequest<InputTypesUnion, GetObjectInput, Readable>(
+  new S3Client({}),
+  new GetObjectCommand({
+    Bucket: "bucket",
+    Key: "key"
+  })
+);
+```
+
+You can omit the generics in this function and rely on the type inference. In this
+way you will lose the type safety for insuring client and command comes from the same
+service.
+
+```typescript
+import { DynamoDBClient } from "@aws-sdk/client-dynamodb-node/DynamoDBClient";
+import { GetObjectCommand } from "@aws-sdk/client-s3-node/commands/GetObjectCommand";
+/*THIS IS WRONG, but TypeScript won't tell you*/
+const request = await createRequest(
+  new DynamoDBClient({}),
+  new GetObjectCommand({
+    Bucket: "bucket",
+    Key: "key"
+  })
+);
+```

packages/util-create-request/package.json

@@ -0,0 +1,28 @@
+{
+  "name": "@aws-sdk/util-create-request",
+  "version": "0.1.0-preview.1",
+  "scripts": {
+    "prepublishOnly": "tsc",
+    "pretest": "tsc -p tsconfig.test.json",
+    "test": "jest"
+  },
+  "main": "./build/index.js",
+  "types": "./build/index.d.ts",
+  "author": {
+    "name": "AWS SDK for JavaScript Team",
+    "email": "aws-sdk-js@amazon.com",
+    "url": "https://aws.amazon.com/javascript/"
+  },
+  "license": "Apache-2.0",
+  "dependencies": {
+    "tslib": "^1.8.0",
+    "@aws-sdk/types": "^0.1.0-preview.3"
+  },
+  "devDependencies": {
+    "@types/node": "^10.0.3",
+    "@types/jest": "^20.0.2",
+    "@aws-sdk/middleware-stack": "^0.1.0-preview.4",
+    "jest": "^20.0.4",
+    "typescript": "^3.4.5"
+  }
+}