/var/www/greso.tech/server/nsm/node_modules/google-gax/build/src/streamingCalls
Edit: /var/www/greso.tech/server/nsm/node_modules/google-gax/build/src/streamingCalls/streaming.js (6378B)
"use strict";
/**
* Copyright 2020 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.StreamProxy = exports.StreamType = void 0;
const googleError_1 = require("../googleError");
// eslint-disable-next-line @typescript-eslint/no-var-requires
const duplexify = require('duplexify');
// eslint-disable-next-line @typescript-eslint/no-var-requires
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, rest) {
super(undefined, undefined, {
objectMode: true,
readable: type !== StreamType.CLIENT_STREAMING,
writable: type !== StreamType.SERVER_STREAMING,
});
this.type = type;
this._callback = callback;
this._isCancelCalled = false;
this._responseHasSent = false;
this.rest = rest;
}
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));
});
// gRPC is guaranteed emit the 'status' event but not 'metadata', and 'status' is the last event to emit.
// Emit the 'response' event if stream has no 'metadata' event.
// This avoids the stream swallowing the other events, such as 'end'.
stream.on('status', () => {
if (!this._responseHasSent) {
stream.emit('response', {
code: 200,
details: '',
message: 'OK',
});
}
});
// 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,
});
this._responseHasSent = true;
});
stream.on('error', error => {
googleError_1.GoogleError.parseGRPCStatusDetails(error);
});
}
/**
* 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, retryRequestOptions = {}) {
if (this.type === StreamType.SERVER_STREAMING) {
if (this.rest) {
const stream = apiCall(argument, this._callback);
this.stream = stream;
this.setReadable(stream);
}
else {
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;
},
retries: retryRequestOptions.retries,
currentRetryAttempt: retryRequestOptions.currentRetryAttempt,
noResponseRetries: retryRequestOptions.noResponseRetries,
shouldRetryFn: retryRequestOptions.shouldRetryFn,
});
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;
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