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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 = 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) {
this.status = Object.assign({ code: constants_1.Status.UNAVAILABLE, details: 'No connection established', metadata: new metadata_1.Metadata() }, status);
}
pick(pickArgs) {
return {
pickResultType: PickResultType.TRANSIENT_FAILURE,
subchannel: null,
status: this.status,
onCallStarted: null,
onCallEnded: 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.
* If the childPicker is provided, delegate to it instead of returning the
* hardcoded QUEUE pick result, but still calls exitIdle.
*/
class QueuePicker {
// Constructed with a load balancer. Calls exitIdle on it the first time pick is called
constructor(loadBalancer, childPicker) {
this.loadBalancer = loadBalancer;
this.childPicker = childPicker;
this.calledExitIdle = false;
}
pick(pickArgs) {
if (!this.calledExitIdle) {
process.nextTick(() => {
this.loadBalancer.exitIdle();
});
this.calledExitIdle = true;
}
if (this.childPicker) {
return this.childPicker.pick(pickArgs);
}
else {
return {
pickResultType: PickResultType.QUEUE,
subchannel: null,
status: null,
onCallStarted: null,
onCallEnded: null,
};
}
}
}
exports.QueuePicker = QueuePicker;
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