Initial commit

2021-12-29 01:57:42 -08:00
commit ce39a60b42
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+"use strict";
+/*
+ * Copyright 2019 gRPC authors.
+ *
+ * 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.BackoffTimeout = void 0;
+const INITIAL_BACKOFF_MS = 1000;
+const BACKOFF_MULTIPLIER = 1.6;
+const MAX_BACKOFF_MS = 120000;
+const BACKOFF_JITTER = 0.2;
+/**
+ * Get a number uniformly at random in the range [min, max)
+ * @param min
+ * @param max
+ */
+function uniformRandom(min, max) {
+    return Math.random() * (max - min) + min;
+}
+class BackoffTimeout {
+    constructor(callback, options) {
+        this.callback = callback;
+        this.initialDelay = INITIAL_BACKOFF_MS;
+        this.multiplier = BACKOFF_MULTIPLIER;
+        this.maxDelay = MAX_BACKOFF_MS;
+        this.jitter = BACKOFF_JITTER;
+        this.running = false;
+        this.hasRef = true;
+        if (options) {
+            if (options.initialDelay) {
+                this.initialDelay = options.initialDelay;
+            }
+            if (options.multiplier) {
+                this.multiplier = options.multiplier;
+            }
+            if (options.jitter) {
+                this.jitter = options.jitter;
+            }
+            if (options.maxDelay) {
+                this.maxDelay = options.maxDelay;
+            }
+        }
+        this.nextDelay = this.initialDelay;
+        this.timerId = setTimeout(() => { }, 0);
+        clearTimeout(this.timerId);
+    }
+    /**
+     * Call the callback after the current amount of delay time
+     */
+    runOnce() {
+        var _a, _b;
+        this.running = true;
+        this.timerId = setTimeout(() => {
+            this.callback();
+            this.running = false;
+        }, this.nextDelay);
+        if (!this.hasRef) {
+            (_b = (_a = this.timerId).unref) === null || _b === void 0 ? void 0 : _b.call(_a);
+        }
+        const nextBackoff = Math.min(this.nextDelay * this.multiplier, this.maxDelay);
+        const jitterMagnitude = nextBackoff * this.jitter;
+        this.nextDelay =
+            nextBackoff + uniformRandom(-jitterMagnitude, jitterMagnitude);
+    }
+    /**
+     * Stop the timer. The callback will not be called until `runOnce` is called
+     * again.
+     */
+    stop() {
+        clearTimeout(this.timerId);
+        this.running = false;
+    }
+    /**
+     * Reset the delay time to its initial value.
+     */
+    reset() {
+        this.nextDelay = this.initialDelay;
+    }
+    isRunning() {
+        return this.running;
+    }
+    ref() {
+        var _a, _b;
+        this.hasRef = true;
+        (_b = (_a = this.timerId).ref) === null || _b === void 0 ? void 0 : _b.call(_a);
+    }
+    unref() {
+        var _a, _b;
+        this.hasRef = false;
+        (_b = (_a = this.timerId).unref) === null || _b === void 0 ? void 0 : _b.call(_a);
+    }
+}
+exports.BackoffTimeout = BackoffTimeout;
+//# sourceMappingURL=backoff-timeout.js.map