@grpc/grpc-js
Version:
gRPC Library for Node - pure JS implementation
103 lines • 4.85 kB
JavaScript
;
/*
* 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.validateLoadBalancingConfig = exports.getFirstUsableConfig = exports.isLoadBalancerNameRegistered = exports.createLoadBalancer = exports.registerDefaultLoadBalancerType = exports.registerLoadBalancerType = exports.createChildChannelControlHelper = void 0;
/**
* Create a child ChannelControlHelper that overrides some methods of the
* parent while letting others pass through to the parent unmodified. This
* allows other code to create these children without needing to know about
* all of the methods to be passed through.
* @param parent
* @param overrides
*/
function createChildChannelControlHelper(parent, overrides) {
var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k;
return {
createSubchannel: (_b = (_a = overrides.createSubchannel) === null || _a === void 0 ? void 0 : _a.bind(overrides)) !== null && _b !== void 0 ? _b : parent.createSubchannel.bind(parent),
updateState: (_d = (_c = overrides.updateState) === null || _c === void 0 ? void 0 : _c.bind(overrides)) !== null && _d !== void 0 ? _d : parent.updateState.bind(parent),
requestReresolution: (_f = (_e = overrides.requestReresolution) === null || _e === void 0 ? void 0 : _e.bind(overrides)) !== null && _f !== void 0 ? _f : parent.requestReresolution.bind(parent),
addChannelzChild: (_h = (_g = overrides.addChannelzChild) === null || _g === void 0 ? void 0 : _g.bind(overrides)) !== null && _h !== void 0 ? _h : parent.addChannelzChild.bind(parent),
removeChannelzChild: (_k = (_j = overrides.removeChannelzChild) === null || _j === void 0 ? void 0 : _j.bind(overrides)) !== null && _k !== void 0 ? _k : parent.removeChannelzChild.bind(parent),
};
}
exports.createChildChannelControlHelper = createChildChannelControlHelper;
const registeredLoadBalancerTypes = {};
let defaultLoadBalancerType = null;
function registerLoadBalancerType(typeName, loadBalancerType, loadBalancingConfigType) {
registeredLoadBalancerTypes[typeName] = {
LoadBalancer: loadBalancerType,
LoadBalancingConfig: loadBalancingConfigType,
};
}
exports.registerLoadBalancerType = registerLoadBalancerType;
function registerDefaultLoadBalancerType(typeName) {
defaultLoadBalancerType = typeName;
}
exports.registerDefaultLoadBalancerType = registerDefaultLoadBalancerType;
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, fallbackTodefault = false) {
for (const config of configs) {
if (config.getLoadBalancerName() in registeredLoadBalancerTypes) {
return config;
}
}
if (fallbackTodefault) {
if (defaultLoadBalancerType) {
return new registeredLoadBalancerTypes[defaultLoadBalancerType].LoadBalancingConfig();
}
else {
return null;
}
}
else {
return null;
}
}
exports.getFirstUsableConfig = getFirstUsableConfig;
// eslint-disable-next-line @typescript-eslint/no-explicit-any
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;
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