--- /dev/null
+"use strict";
+/**
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+const warnings_1 = require("./warnings");
+const duplexify = require('duplexify');
+const retryRequest = require('retry-request');
+/**
+ * The type of gRPC streaming.
+ * @enum {number}
+ */
+var StreamType;
+(function (StreamType) {
+ /** Client sends a single request, server streams responses. */
+ StreamType[StreamType["SERVER_STREAMING"] = 1] = "SERVER_STREAMING";
+ /** Client streams requests, server returns a single response. */
+ StreamType[StreamType["CLIENT_STREAMING"] = 2] = "CLIENT_STREAMING";
+ /** Both client and server stream objects. */
+ StreamType[StreamType["BIDI_STREAMING"] = 3] = "BIDI_STREAMING";
+})(StreamType = exports.StreamType || (exports.StreamType = {}));
+class StreamProxy extends duplexify {
+ /**
+ * StreamProxy is a proxy to gRPC-streaming method.
+ *
+ * @private
+ * @constructor
+ * @param {StreamType} type - the type of gRPC stream.
+ * @param {ApiCallback} callback - the callback for further API call.
+ */
+ constructor(type, callback) {
+ super(undefined, undefined, {
+ objectMode: true,
+ readable: type !== StreamType.CLIENT_STREAMING,
+ writable: type !== StreamType.SERVER_STREAMING,
+ });
+ this.type = type;
+ this._callback = callback;
+ this._isCancelCalled = false;
+ }
+ cancel() {
+ if (this.stream) {
+ this.stream.cancel();
+ }
+ else {
+ this._isCancelCalled = true;
+ }
+ }
+ /**
+ * Forward events from an API request stream to the user's stream.
+ * @param {Stream} stream - The API request stream.
+ */
+ forwardEvents(stream) {
+ const eventsToForward = ['metadata', 'response', 'status'];
+ eventsToForward.forEach(event => {
+ stream.on(event, this.emit.bind(this, event));
+ });
+ // We also want to supply the status data as 'response' event to support
+ // the behavior of google-cloud-node expects.
+ // see:
+ // https://github.com/GoogleCloudPlatform/google-cloud-node/pull/1775#issuecomment-259141029
+ // https://github.com/GoogleCloudPlatform/google-cloud-node/blob/116436fa789d8b0f7fc5100b19b424e3ec63e6bf/packages/common/src/grpc-service.js#L355
+ stream.on('metadata', metadata => {
+ // Create a response object with succeeds.
+ // TODO: unify this logic with the decoration of gRPC response when it's
+ // added. see: https://github.com/googleapis/gax-nodejs/issues/65
+ stream.emit('response', {
+ code: 200,
+ details: '',
+ message: 'OK',
+ metadata,
+ });
+ });
+ }
+ /**
+ * Specifies the target stream.
+ * @param {ApiCall} apiCall - the API function to be called.
+ * @param {Object} argument - the argument to be passed to the apiCall.
+ */
+ setStream(apiCall, argument) {
+ if (this.type === StreamType.SERVER_STREAMING) {
+ const retryStream = retryRequest(null, {
+ objectMode: true,
+ request: () => {
+ if (this._isCancelCalled) {
+ if (this.stream) {
+ this.stream.cancel();
+ }
+ return;
+ }
+ const stream = apiCall(argument, this._callback);
+ this.stream = stream;
+ this.forwardEvents(stream);
+ return stream;
+ },
+ });
+ this.setReadable(retryStream);
+ return;
+ }
+ const stream = apiCall(argument, this._callback);
+ this.stream = stream;
+ this.forwardEvents(stream);
+ if (this.type === StreamType.CLIENT_STREAMING) {
+ this.setWritable(stream);
+ }
+ if (this.type === StreamType.BIDI_STREAMING) {
+ this.setReadable(stream);
+ this.setWritable(stream);
+ }
+ if (this._isCancelCalled && this.stream) {
+ this.stream.cancel();
+ }
+ }
+}
+exports.StreamProxy = StreamProxy;
+class GrpcStreamable {
+ /**
+ * An API caller for methods of gRPC streaming.
+ * @private
+ * @constructor
+ * @param {StreamDescriptor} descriptor - the descriptor of the method structure.
+ */
+ constructor(descriptor) {
+ this.descriptor = descriptor;
+ }
+ init(settings, callback) {
+ return new StreamProxy(this.descriptor.type, callback);
+ }
+ wrap(func) {
+ switch (this.descriptor.type) {
+ case StreamType.SERVER_STREAMING:
+ return (argument, metadata, options) => {
+ return func(argument, metadata, options);
+ };
+ case StreamType.CLIENT_STREAMING:
+ return (argument, metadata, options, callback) => {
+ return func(metadata, options, callback);
+ };
+ case StreamType.BIDI_STREAMING:
+ return (argument, metadata, options) => {
+ return func(metadata, options);
+ };
+ default:
+ warnings_1.warn('streaming_wrap_unknown_stream_type', `Unknown stream type: ${this.descriptor.type}`);
+ }
+ return func;
+ }
+ call(apiCall, argument, settings, stream) {
+ stream.setStream(apiCall, argument);
+ }
+ fail(stream, err) {
+ stream.emit('error', err);
+ }
+ result(stream) {
+ return stream;
+ }
+}
+exports.GrpcStreamable = GrpcStreamable;
+class StreamDescriptor {
+ /**
+ * Describes the structure of gRPC streaming call.
+ * @constructor
+ * @param {StreamType} streamType - the type of streaming.
+ */
+ constructor(streamType) {
+ this.type = streamType;
+ }
+ apiCaller(settings) {
+ // Right now retrying does not work with gRPC-streaming, because retryable
+ // assumes an API call returns an event emitter while gRPC-streaming methods
+ // return Stream.
+ // TODO: support retrying.
+ settings.retry = null;
+ return new GrpcStreamable(this);
+ }
+}
+exports.StreamDescriptor = StreamDescriptor;
+//# sourceMappingURL=streaming.js.map
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git://repos.xcallymotion.com / motion2.git / blobdiff