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.QueuePicker = exports.UnavailablePicker = exports.PickResultType = void 0;
+const metadata_1 = require("./metadata");
+const constants_1 = require("./constants");
+var PickResultType;
+(function (PickResultType) {
+    PickResultType[PickResultType["COMPLETE"] = 0] = "COMPLETE";
+    PickResultType[PickResultType["QUEUE"] = 1] = "QUEUE";
+    PickResultType[PickResultType["TRANSIENT_FAILURE"] = 2] = "TRANSIENT_FAILURE";
+    PickResultType[PickResultType["DROP"] = 3] = "DROP";
+})(PickResultType = exports.PickResultType || (exports.PickResultType = {}));
+/**
+ * A standard picker representing a load balancer in the TRANSIENT_FAILURE
+ * state. Always responds to every pick request with an UNAVAILABLE status.
+ */
+class UnavailablePicker {
+    constructor(status) {
+        if (status !== undefined) {
+            this.status = status;
+        }
+        else {
+            this.status = {
+                code: constants_1.Status.UNAVAILABLE,
+                details: 'No connection established',
+                metadata: new metadata_1.Metadata(),
+            };
+        }
+    }
+    pick(pickArgs) {
+        return {
+            pickResultType: PickResultType.TRANSIENT_FAILURE,
+            subchannel: null,
+            status: this.status,
+            extraFilterFactories: [],
+            onCallStarted: null,
+        };
+    }
+}
+exports.UnavailablePicker = UnavailablePicker;
+/**
+ * A standard picker representing a load balancer in the IDLE or CONNECTING
+ * state. Always responds to every pick request with a QUEUE pick result
+ * indicating that the pick should be tried again with the next `Picker`. Also
+ * reports back to the load balancer that a connection should be established
+ * once any pick is attempted.
+ */
+class QueuePicker {
+    // Constructed with a load balancer. Calls exitIdle on it the first time pick is called
+    constructor(loadBalancer) {
+        this.loadBalancer = loadBalancer;
+        this.calledExitIdle = false;
+    }
+    pick(pickArgs) {
+        if (!this.calledExitIdle) {
+            process.nextTick(() => {
+                this.loadBalancer.exitIdle();
+            });
+            this.calledExitIdle = true;
+        }
+        return {
+            pickResultType: PickResultType.QUEUE,
+            subchannel: null,
+            status: null,
+            extraFilterFactories: [],
+            onCallStarted: null,
+        };
+    }
+}
+exports.QueuePicker = QueuePicker;
+//# sourceMappingURL=picker.js.map