| 1 | ;
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| 2 | Object.defineProperty(exports, "__esModule", { value: true });
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| 3 | exports.PullRetry = exports.RETRY_CODES = void 0;
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| 4 | /*!
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| 5 | * Copyright 2019 Google Inc. All Rights Reserved.
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| 6 | *
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| 7 | * Licensed under the Apache License, Version 2.0 (the "License");
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| 8 | * you may not use this file except in compliance with the License.
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| 9 | * You may obtain a copy of the License at
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| 10 | *
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| 11 | * http://www.apache.org/licenses/LICENSE-2.0
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| 12 | *
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| 13 | * Unless required by applicable law or agreed to in writing, software
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| 14 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 16 | * See the License for the specific language governing permissions and
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| 17 | * limitations under the License.
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| 18 | */
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| 19 | const google_gax_1 = require("google-gax");
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| 20 | /*!
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| 21 | * retryable grpc.status codes
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| 22 | */
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| 23 | exports.RETRY_CODES = [
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| 24 | google_gax_1.grpc.status.DEADLINE_EXCEEDED,
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| 25 | google_gax_1.grpc.status.RESOURCE_EXHAUSTED,
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| 26 | google_gax_1.grpc.status.ABORTED,
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| 27 | google_gax_1.grpc.status.INTERNAL,
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| 28 | google_gax_1.grpc.status.UNAVAILABLE,
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| 29 | google_gax_1.grpc.status.CANCELLED,
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| 30 | ];
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| 31 | /**
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| 32 | * Used to track pull requests and determine if additional requests should be
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| 33 | * made, etc.
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| 34 | *
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| 35 | * @class
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| 36 | * @private
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| 37 | */
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| 38 | class PullRetry {
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| 39 | constructor() {
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| 40 | this.failures = 0;
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| 41 | }
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| 42 | /**
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| 43 | * Generates a timeout that can be used for applying a backoff based on the
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| 44 | * current number of failed requests.
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| 45 | *
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| 46 | * @see {@link https://cloud.google.com/iot/docs/how-tos/exponential-backoff}
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| 47 | * @private
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| 48 | * @returns {number}
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| 49 | */
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| 50 | createTimeout() {
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| 51 | if (this.failures === 0) {
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| 52 | return 0;
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| 53 | }
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| 54 | return Math.pow(2, this.failures) * 1000 + Math.floor(Math.random() * 1000);
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| 55 | }
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| 56 | /**
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| 57 | * Determines if a request grpc.status should be retried.
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| 58 | *
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| 59 | * Deadlines behave kind of unexpectedly on streams, rather than using it as
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| 60 | * an indicator of when to give up trying to connect, it actually dictates
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| 61 | * how long the stream should stay open. Because of this, it is virtually
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| 62 | * impossible to determine whether or not a deadline error is the result of
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| 63 | * the server closing the stream or if we timed out waiting for a connection.
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| 64 | *
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| 65 | * @private
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| 66 | * @param {object} grpc.status The request grpc.status.
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| 67 | * @returns {boolean}
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| 68 | */
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| 69 | retry(err) {
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| 70 | if (err.code === google_gax_1.grpc.status.OK ||
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| 71 | err.code === google_gax_1.grpc.status.DEADLINE_EXCEEDED) {
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| 72 | this.failures = 0;
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| 73 | }
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| 74 | else {
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| 75 | this.failures += 1;
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| 76 | }
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| 77 | if (err.code === google_gax_1.grpc.status.UNAVAILABLE &&
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| 78 | err.details &&
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| 79 | err.details.match(/Server shutdownNow invoked/)) {
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| 80 | return true;
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| 81 | }
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| 82 | return exports.RETRY_CODES.includes(err.code);
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| 83 | }
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| 84 | }
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| 85 | exports.PullRetry = PullRetry;
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| 86 | //# sourceMappingURL=pull-retry.js.map |
| \ | No newline at end of file |