load-balancer-child-handler.js
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"use strict";
/*
* Copyright 2020 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.ChildLoadBalancerHandler = void 0;
const load_balancer_1 = require("./load-balancer");
const channel_1 = require("./channel");
const TYPE_NAME = 'child_load_balancer_helper';
class ChildLoadBalancerHandler {
constructor(channelControlHelper) {
this.channelControlHelper = channelControlHelper;
this.currentChild = null;
this.pendingChild = null;
this.ChildPolicyHelper = class {
constructor(parent) {
this.parent = parent;
this.child = null;
}
createSubchannel(subchannelAddress, subchannelArgs) {
return this.parent.channelControlHelper.createSubchannel(subchannelAddress, subchannelArgs);
}
updateState(connectivityState, picker) {
var _a;
if (this.calledByPendingChild()) {
if (connectivityState !== channel_1.ConnectivityState.READY) {
return;
}
(_a = this.parent.currentChild) === null || _a === void 0 ? void 0 : _a.destroy();
this.parent.currentChild = this.parent.pendingChild;
this.parent.pendingChild = null;
}
else if (!this.calledByCurrentChild()) {
return;
}
this.parent.channelControlHelper.updateState(connectivityState, picker);
}
requestReresolution() {
var _a;
const latestChild = (_a = this.parent.pendingChild) !== null && _a !== void 0 ? _a : this.parent.currentChild;
if (this.child === latestChild) {
this.parent.channelControlHelper.requestReresolution();
}
}
setChild(newChild) {
this.child = newChild;
}
calledByPendingChild() {
return this.child === this.parent.pendingChild;
}
calledByCurrentChild() {
return this.child === this.parent.currentChild;
}
};
}
/**
* Prerequisites: lbConfig !== null and lbConfig.name is registered
* @param addressList
* @param lbConfig
* @param attributes
*/
updateAddressList(addressList, lbConfig, attributes) {
let childToUpdate;
if (this.currentChild === null ||
this.currentChild.getTypeName() !== lbConfig.getLoadBalancerName()) {
const newHelper = new this.ChildPolicyHelper(this);
const newChild = load_balancer_1.createLoadBalancer(lbConfig, newHelper);
newHelper.setChild(newChild);
if (this.currentChild === null) {
this.currentChild = newChild;
childToUpdate = this.currentChild;
}
else {
if (this.pendingChild) {
this.pendingChild.destroy();
}
this.pendingChild = newChild;
childToUpdate = this.pendingChild;
}
}
else {
if (this.pendingChild === null) {
childToUpdate = this.currentChild;
}
else {
childToUpdate = this.pendingChild;
}
}
childToUpdate.updateAddressList(addressList, lbConfig, attributes);
}
exitIdle() {
if (this.currentChild) {
this.currentChild.resetBackoff();
if (this.pendingChild) {
this.pendingChild.resetBackoff();
}
}
}
resetBackoff() {
if (this.currentChild) {
this.currentChild.resetBackoff();
if (this.pendingChild) {
this.pendingChild.resetBackoff();
}
}
}
destroy() {
if (this.currentChild) {
this.currentChild.destroy();
this.currentChild = null;
}
if (this.pendingChild) {
this.pendingChild.destroy();
this.pendingChild = null;
}
}
getTypeName() {
return TYPE_NAME;
}
}
exports.ChildLoadBalancerHandler = ChildLoadBalancerHandler;
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