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musix-oss/node_modules/google-gax/build/src/longRunningCalls/longrunning.js
MatteZ02 30022c7634 Modules
2020-03-03 22:30:50 +02:00

272 lines
10 KiB
JavaScript

"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 });
const events_1 = require("events");
const status_1 = require("../status");
const googleError_1 = require("../googleError");
class Operation extends events_1.EventEmitter {
/**
* Wrapper for a google.longrunnung.Operation.
*
* @constructor
*
* @param {google.longrunning.Operation} grpcOp - The operation to be wrapped.
* @param {LongRunningDescriptor} longrunningDescriptor - This defines the
* operations service client and unpacking mechanisms for the operation.
* @param {BackoffSettings} backoffSettings - The backoff settings used in
* in polling the operation.
* @param {CallOptions} callOptions - CallOptions used in making get operation
* requests.
*/
constructor(grpcOp, longrunningDescriptor, backoffSettings, callOptions) {
super();
this.completeListeners = 0;
this.hasActiveListeners = false;
this.latestResponse = grpcOp;
this.name = this.latestResponse.name;
this.done = this.latestResponse.done;
this.error = this.latestResponse.error;
this.longrunningDescriptor = longrunningDescriptor;
this.result = null;
this.metadata = null;
this.backoffSettings = backoffSettings;
this._unpackResponse(grpcOp);
this._listenForEvents();
this._callOptions = callOptions;
}
/**
* Begin listening for events on the operation. This method keeps track of how
* many "complete" listeners are registered and removed, making sure polling
* is handled automatically.
*
* As long as there is one active "complete" listener, the connection is open.
* When there are no more listeners, the polling stops.
*
* @private
*/
_listenForEvents() {
this.on('newListener', event => {
if (event === 'complete') {
this.completeListeners++;
if (!this.hasActiveListeners) {
this.hasActiveListeners = true;
this.startPolling_();
}
}
});
this.on('removeListener', event => {
if (event === 'complete' && --this.completeListeners === 0) {
this.hasActiveListeners = false;
}
});
}
/**
* Cancels current polling api call and cancels the operation.
*
* @return {Promise} the promise of the OperationsClient#cancelOperation api
* request.
*/
cancel() {
if (this.currentCallPromise_) {
this.currentCallPromise_.cancel();
}
const operationsClient = this.longrunningDescriptor.operationsClient;
return operationsClient.cancelOperation({
name: this.latestResponse.name,
});
}
getOperation(callback) {
const self = this;
const operationsClient = this.longrunningDescriptor.operationsClient;
function promisifyResponse() {
if (!callback) {
// tslint:disable-next-line variable-name
const PromiseCtor = self._callOptions.promise;
return new PromiseCtor((resolve, reject) => {
if (self.latestResponse.error) {
const error = new googleError_1.GoogleError(self.latestResponse.error.message);
error.code = self.latestResponse.error.code;
reject(error);
}
else {
resolve([self.result, self.metadata, self.latestResponse]);
}
});
}
return;
}
if (this.latestResponse.done) {
this._unpackResponse(this.latestResponse, callback);
return promisifyResponse();
}
this.currentCallPromise_ = operationsClient.getOperation({ name: this.latestResponse.name }, this._callOptions);
const noCallbackPromise = this.currentCallPromise_.then(responses => {
self.latestResponse = responses[0];
self._unpackResponse(responses[0], callback);
return promisifyResponse();
});
if (!callback) {
return noCallbackPromise;
}
}
_unpackResponse(op, callback) {
const responseDecoder = this.longrunningDescriptor.responseDecoder;
const metadataDecoder = this.longrunningDescriptor.metadataDecoder;
let response;
let metadata;
if (op.done) {
if (op.result === 'error') {
const error = new googleError_1.GoogleError(op.error.message);
error.code = op.error.code;
this.error = error;
if (callback) {
callback(error);
}
return;
}
if (responseDecoder && op.response) {
this.response = op.response;
response = responseDecoder(op.response.value);
this.result = response;
this.done = true;
}
}
if (metadataDecoder && op.metadata) {
metadata = metadataDecoder(op.metadata.value);
this.metadata = metadata;
}
if (callback) {
callback(null, response, metadata, op);
}
}
/**
* Poll `getOperation` to check the operation's status. This runs a loop to
* ping using the backoff strategy specified at initialization.
*
* Note: This method is automatically called once a "complete" event handler
* is registered on the operation.
*
* @private
*/
startPolling_() {
const self = this;
let now = new Date();
const delayMult = this.backoffSettings.retryDelayMultiplier;
const maxDelay = this.backoffSettings.maxRetryDelayMillis;
let delay = this.backoffSettings.initialRetryDelayMillis;
let deadline = Infinity;
if (this.backoffSettings.totalTimeoutMillis) {
deadline = now.getTime() + this.backoffSettings.totalTimeoutMillis;
}
let previousMetadataBytes;
if (this.latestResponse.metadata) {
previousMetadataBytes = this.latestResponse.metadata.value;
}
// tslint:disable-next-line no-any
function emit(event, ...args) {
self.emit(event, ...args);
}
// Helper function to replace nodejs buffer's equals()
function arrayEquals(a, b) {
if (a.byteLength !== b.byteLength) {
return false;
}
for (let i = 0; i < a.byteLength; ++i) {
if (a[i] !== b[i])
return false;
}
return true;
}
function retry() {
if (!self.hasActiveListeners) {
return;
}
if (now.getTime() >= deadline) {
const error = new googleError_1.GoogleError('Total timeout exceeded before any response was received');
error.code = status_1.Status.DEADLINE_EXCEEDED;
setImmediate(emit, 'error', error);
return;
}
self.getOperation((err, result, metadata, rawResponse) => {
if (err) {
setImmediate(emit, 'error', err);
return;
}
if (!result) {
if (rawResponse.metadata &&
(!previousMetadataBytes ||
(rawResponse &&
!arrayEquals(rawResponse.metadata.value, previousMetadataBytes)))) {
setImmediate(emit, 'progress', metadata, rawResponse);
previousMetadataBytes = rawResponse.metadata.value;
}
// special case: some APIs fail to set either result or error
// but set done = true (e.g. speech with silent file).
// Don't hang forever in this case.
if (rawResponse.done) {
const error = new googleError_1.GoogleError('Long running operation has finished but there was no result');
error.code = status_1.Status.UNKNOWN;
setImmediate(emit, 'error', error);
return;
}
setTimeout(() => {
now = new Date();
delay = Math.min(delay * delayMult, maxDelay);
retry();
}, delay);
return;
}
setImmediate(emit, 'complete', result, metadata, rawResponse);
});
}
retry();
}
/**
* Wraps the `complete` and `error` events in a Promise.
*
* @return {promise} - Promise that resolves on operation completion and rejects
* on operation error.
*/
promise() {
// tslint:disable-next-line variable-name
const PromiseCtor = this._callOptions.promise;
return new PromiseCtor((resolve, reject) => {
this.on('error', reject).on('complete', (result, metadata, rawResponse) => {
resolve([result, metadata, rawResponse]);
});
});
}
}
exports.Operation = Operation;
/**
* Method used to create Operation objects.
*
* @constructor
*
* @param {google.longrunning.Operation} op - The operation to be wrapped.
* @param {LongRunningDescriptor} longrunningDescriptor - This defines the
* operations service client and unpacking mechanisms for the operation.
* @param {BackoffSettings} backoffSettings - The backoff settings used in
* in polling the operation.
* @param {CallOptions=} callOptions - CallOptions used in making get operation
* requests.
*/
function operation(op, longrunningDescriptor, backoffSettings, callOptions) {
return new Operation(op, longrunningDescriptor, backoffSettings, callOptions);
}
exports.operation = operation;
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