193 lines
7.7 KiB
JavaScript
193 lines
7.7 KiB
JavaScript
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"use strict";
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/* --------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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* ------------------------------------------------------------------------------------------ */
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.ReadableStreamMessageReader = exports.AbstractMessageReader = exports.MessageReader = void 0;
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const ral_1 = require("./ral");
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const Is = require("./is");
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const events_1 = require("./events");
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const semaphore_1 = require("./semaphore");
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var MessageReader;
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(function (MessageReader) {
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function is(value) {
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let candidate = value;
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return candidate && Is.func(candidate.listen) && Is.func(candidate.dispose) &&
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Is.func(candidate.onError) && Is.func(candidate.onClose) && Is.func(candidate.onPartialMessage);
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}
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MessageReader.is = is;
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})(MessageReader = exports.MessageReader || (exports.MessageReader = {}));
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class AbstractMessageReader {
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constructor() {
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this.errorEmitter = new events_1.Emitter();
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this.closeEmitter = new events_1.Emitter();
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this.partialMessageEmitter = new events_1.Emitter();
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}
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dispose() {
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this.errorEmitter.dispose();
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this.closeEmitter.dispose();
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}
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get onError() {
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return this.errorEmitter.event;
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}
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fireError(error) {
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this.errorEmitter.fire(this.asError(error));
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}
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get onClose() {
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return this.closeEmitter.event;
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}
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fireClose() {
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this.closeEmitter.fire(undefined);
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}
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get onPartialMessage() {
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return this.partialMessageEmitter.event;
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}
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firePartialMessage(info) {
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this.partialMessageEmitter.fire(info);
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}
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asError(error) {
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if (error instanceof Error) {
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return error;
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}
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else {
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return new Error(`Reader received error. Reason: ${Is.string(error.message) ? error.message : 'unknown'}`);
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}
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}
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}
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exports.AbstractMessageReader = AbstractMessageReader;
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var ResolvedMessageReaderOptions;
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(function (ResolvedMessageReaderOptions) {
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function fromOptions(options) {
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let charset;
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let result;
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let contentDecoder;
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const contentDecoders = new Map();
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let contentTypeDecoder;
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const contentTypeDecoders = new Map();
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if (options === undefined || typeof options === 'string') {
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charset = options ?? 'utf-8';
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}
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else {
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charset = options.charset ?? 'utf-8';
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if (options.contentDecoder !== undefined) {
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contentDecoder = options.contentDecoder;
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contentDecoders.set(contentDecoder.name, contentDecoder);
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}
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if (options.contentDecoders !== undefined) {
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for (const decoder of options.contentDecoders) {
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contentDecoders.set(decoder.name, decoder);
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}
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}
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if (options.contentTypeDecoder !== undefined) {
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contentTypeDecoder = options.contentTypeDecoder;
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contentTypeDecoders.set(contentTypeDecoder.name, contentTypeDecoder);
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}
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if (options.contentTypeDecoders !== undefined) {
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for (const decoder of options.contentTypeDecoders) {
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contentTypeDecoders.set(decoder.name, decoder);
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}
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}
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}
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if (contentTypeDecoder === undefined) {
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contentTypeDecoder = (0, ral_1.default)().applicationJson.decoder;
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contentTypeDecoders.set(contentTypeDecoder.name, contentTypeDecoder);
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}
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return { charset, contentDecoder, contentDecoders, contentTypeDecoder, contentTypeDecoders };
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}
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ResolvedMessageReaderOptions.fromOptions = fromOptions;
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})(ResolvedMessageReaderOptions || (ResolvedMessageReaderOptions = {}));
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class ReadableStreamMessageReader extends AbstractMessageReader {
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constructor(readable, options) {
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super();
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this.readable = readable;
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this.options = ResolvedMessageReaderOptions.fromOptions(options);
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this.buffer = (0, ral_1.default)().messageBuffer.create(this.options.charset);
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this._partialMessageTimeout = 10000;
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this.nextMessageLength = -1;
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this.messageToken = 0;
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this.readSemaphore = new semaphore_1.Semaphore(1);
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}
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set partialMessageTimeout(timeout) {
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this._partialMessageTimeout = timeout;
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}
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get partialMessageTimeout() {
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return this._partialMessageTimeout;
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}
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listen(callback) {
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this.nextMessageLength = -1;
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this.messageToken = 0;
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this.partialMessageTimer = undefined;
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this.callback = callback;
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const result = this.readable.onData((data) => {
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this.onData(data);
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});
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this.readable.onError((error) => this.fireError(error));
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this.readable.onClose(() => this.fireClose());
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return result;
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}
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onData(data) {
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this.buffer.append(data);
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while (true) {
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if (this.nextMessageLength === -1) {
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const headers = this.buffer.tryReadHeaders(true);
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if (!headers) {
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return;
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}
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const contentLength = headers.get('content-length');
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if (!contentLength) {
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this.fireError(new Error('Header must provide a Content-Length property.'));
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return;
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}
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const length = parseInt(contentLength);
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if (isNaN(length)) {
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this.fireError(new Error('Content-Length value must be a number.'));
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return;
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}
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this.nextMessageLength = length;
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}
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const body = this.buffer.tryReadBody(this.nextMessageLength);
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if (body === undefined) {
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/** We haven't received the full message yet. */
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this.setPartialMessageTimer();
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return;
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}
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this.clearPartialMessageTimer();
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this.nextMessageLength = -1;
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// Make sure that we convert one received message after the
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// other. Otherwise it could happen that a decoding of a second
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// smaller message finished before the decoding of a first larger
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// message and then we would deliver the second message first.
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this.readSemaphore.lock(async () => {
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const bytes = this.options.contentDecoder !== undefined
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? await this.options.contentDecoder.decode(body)
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: body;
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const message = await this.options.contentTypeDecoder.decode(bytes, this.options);
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this.callback(message);
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}).catch((error) => {
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this.fireError(error);
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});
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}
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}
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clearPartialMessageTimer() {
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if (this.partialMessageTimer) {
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this.partialMessageTimer.dispose();
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this.partialMessageTimer = undefined;
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}
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}
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setPartialMessageTimer() {
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this.clearPartialMessageTimer();
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if (this._partialMessageTimeout <= 0) {
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return;
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}
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this.partialMessageTimer = (0, ral_1.default)().timer.setTimeout((token, timeout) => {
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this.partialMessageTimer = undefined;
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if (token === this.messageToken) {
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this.firePartialMessage({ messageToken: token, waitingTime: timeout });
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this.setPartialMessageTimer();
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}
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}, this._partialMessageTimeout, this.messageToken, this._partialMessageTimeout);
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}
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}
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exports.ReadableStreamMessageReader = ReadableStreamMessageReader;
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