load-balancer.js
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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.registerAll = exports.validateLoadBalancingConfig = exports.getFirstUsableConfig = exports.isLoadBalancerNameRegistered = exports.createLoadBalancer = exports.registerLoadBalancerType = void 0;
const load_balancer_pick_first = require("./load-balancer-pick-first");
const load_balancer_round_robin = require("./load-balancer-round-robin");
const registeredLoadBalancerTypes = {};
function registerLoadBalancerType(typeName, loadBalancerType, loadBalancingConfigType) {
registeredLoadBalancerTypes[typeName] = {
LoadBalancer: loadBalancerType,
LoadBalancingConfig: loadBalancingConfigType
};
}
exports.registerLoadBalancerType = registerLoadBalancerType;
function createLoadBalancer(config, channelControlHelper) {
const typeName = config.getLoadBalancerName();
if (typeName in registeredLoadBalancerTypes) {
return new registeredLoadBalancerTypes[typeName].LoadBalancer(channelControlHelper);
}
else {
return null;
}
}
exports.createLoadBalancer = createLoadBalancer;
function isLoadBalancerNameRegistered(typeName) {
return typeName in registeredLoadBalancerTypes;
}
exports.isLoadBalancerNameRegistered = isLoadBalancerNameRegistered;
function getFirstUsableConfig(configs, defaultPickFirst = false) {
for (const config of configs) {
if (config.getLoadBalancerName() in registeredLoadBalancerTypes) {
return config;
}
}
if (defaultPickFirst) {
return new load_balancer_pick_first.PickFirstLoadBalancingConfig();
}
else {
return null;
}
}
exports.getFirstUsableConfig = getFirstUsableConfig;
function validateLoadBalancingConfig(obj) {
if (!(obj !== null && (typeof obj === 'object'))) {
throw new Error('Load balancing config must be an object');
}
const keys = Object.keys(obj);
if (keys.length !== 1) {
throw new Error('Provided load balancing config has multiple conflicting entries');
}
const typeName = keys[0];
if (typeName in registeredLoadBalancerTypes) {
return registeredLoadBalancerTypes[typeName].LoadBalancingConfig.createFromJson(obj[typeName]);
}
else {
throw new Error(`Unrecognized load balancing config name ${typeName}`);
}
}
exports.validateLoadBalancingConfig = validateLoadBalancingConfig;
function registerAll() {
load_balancer_pick_first.setup();
load_balancer_round_robin.setup();
}
exports.registerAll = registerAll;
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