/
zookeeper.ts
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/
zookeeper.ts
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
import debug from 'debug';
import ip from 'ip';
import zookeeper from 'node-zookeeper-client';
import qs from 'querystring';
import Context from './context';
import DubboUrl from './dubbo-url';
import { ZookeeperDisconnectedError, ZookeeperTimeoutError } from './err';
import { to } from './to';
import { IObservable, IZkClientProps, IZookeeperSubscriber } from './types';
import { isDevEnv, msg, noop, traceErr, traceInfo } from './util';
const log = debug('dubbo:zookeeper');
const ipAddress = ip.address();
export type TAgentAddr = string;
export type TDubboInterface = string;
export class ZkClient implements IObservable<IZookeeperSubscriber> {
constructor(props: IZkClientProps) {
log(`new:|> %O`, props);
this._props = props;
//默认dubbo
this._props.zkRoot = this._props.zkRoot || 'dubbo';
//保存dubbo接口和服务url之间的映射关系
this._dubboServiceUrlMap = new Map();
//初始化订阅者
this._subscriber = {
onData: noop,
onError: noop,
};
//初始化zookeeper的client
this._init().then(() => log('init providerMap and agentSet'));
}
private _client: zookeeper.Client;
private _subscriber: IZookeeperSubscriber;
private readonly _props: IZkClientProps;
private readonly _dubboServiceUrlMap: Map<TDubboInterface, Array<DubboUrl>>;
//===========================public method=============================
static from(props: IZkClientProps) {
return new ZkClient(props);
}
/**
* 根据dubbo调用上下文interface, group, version等,获取负载列表
* @param ctx dubbo调用上下文
*/
getAgentAddrList(ctx: Context) {
const {dubboInterface, version, group} = ctx;
return (this._dubboServiceUrlMap.get(dubboInterface) || [])
.filter(serviceProp => {
const isSameVersion = serviceProp.version === version;
//如果Group为null,就默认匹配, 不检查group
//如果Group不为null,确保group和接口的group一致
const isSameGroup = !group || group === serviceProp.group;
return isSameGroup && isSameVersion;
})
.map(({host, port}) => `${host}:${port}`);
}
/**
* 根据dubbo调用上下文获取服务提供者的信息
* @param ctx
*/
getDubboServiceProp(ctx: Context) {
let {dubboInterface, version, group, invokeHost, invokePort} = ctx;
const dubboServicePropList = this._dubboServiceUrlMap.get(dubboInterface);
for (let prop of dubboServicePropList) {
const isSameHost = prop.host === invokeHost;
const isSamePort = prop.port === invokePort;
const isSameVersion = prop.version === version;
//如果Group为null,就默认匹配, 不检查group
//如果Group不为null,确保group和接口的group一致
const isSameGroup = !group || group === prop.group;
if (isSameHost && isSamePort && isSameVersion && isSameGroup) {
log('getProviderProps:|> %s', prop);
return prop;
}
}
}
/**
* 订阅者
* @param subscriber
*/
subscribe(subscriber: IZookeeperSubscriber) {
this._subscriber = subscriber;
return this;
}
//========================private method==========================
private async _init(): Promise<null> {
const {
zkRoot,
application: {name},
interfaces,
} = this._props;
//等待连接zookeeper
const {err} = await to(this._connect());
if (err) {
log(`connect zk error ${err}`);
this._subscriber.onError(err);
return;
}
//获取所有provider
for (let inf of interfaces) {
//当前接口在zookeeper中的路径
const dubboServicePath = `/${zkRoot}/${inf}/providers`;
//当前接口路径下的dubbo url
const dubboServiceUrls = await this._getDubboServiceUrls(
dubboServicePath,
inf,
);
//init
this._dubboServiceUrlMap.set(inf, []);
for (let serviceUrl of dubboServiceUrls) {
const url = DubboUrl.from(serviceUrl);
const {host, port, dubboVersion, version} = url;
this._dubboServiceUrlMap.get(inf).push(url);
//写入consume信息
this._createConsumer({
host: host,
port: port,
name: name,
dubboInterface: inf,
dubboVersion: dubboVersion,
version: version,
}).then(() => log('create Consumer finish'));
}
}
if (isDevEnv) {
log('agentAddrSet: %O', this._allAgentAddrSet);
log('dubboServiceUrl:|> %O', this._dubboServiceUrlMap);
}
this._subscriber.onData(this._allAgentAddrSet);
}
/**
* 获取所有的负载列表,通过agentAddrMap聚合出来
* 这样有点Reactive的感觉,不需要考虑当中增加删除的动作
*/
private get _allAgentAddrSet() {
const agentSet = new Set();
for (let urlList of this._dubboServiceUrlMap.values()) {
for (let url of urlList) {
agentSet.add(url.host + ':' + url.port);
}
}
return agentSet;
}
/**
* 获取所有的provider列表
* @param {string} dubboServicePath
* @param dubboInterface
* @returns {Promise<Array<string>>}
* @private
*/
private async _getDubboServiceUrls(
dubboServicePath: string,
dubboInterface: string,
): Promise<Array<string>> {
const {res, err} = await to(
this._getChildren(
dubboServicePath,
this._watch(dubboServicePath, dubboInterface),
),
);
if (err) {
log(`getChildren ${dubboServicePath} error ${err}`);
return [];
}
return (res.children || [])
.map(child => decodeURIComponent(child))
.filter(child => child.startsWith('dubbo://'));
}
//========================zookeeper helper=========================
/**
* connect zookeeper
* @returns {Promise<Error>}
*/
private _connect(): Promise<Error | null> {
return new Promise((resolve, reject) => {
const {register} = this._props;
//debug log
log(`connecting zkserver ${register}`);
//connect
this._client = zookeeper.createClient(register, {
retries: 3,
sessionTimeout: 10 * 1000,
});
//超时检测
//node-zookeeper-client,有个bug,当连不上zk时会无限重连
//手动做一个超时检测
const {retries, sessionTimeout} = (this._client as any).options;
const timeId = setTimeout(() => {
log(`Could not connect zk ${register}, time out`);
this._client.close();
const err = new ZookeeperTimeoutError(
`ZooKeeper was connected ${register} time out. `,
);
reject(err);
traceErr(err);
}, retries * sessionTimeout);
//connected
this._client.once('connected', () => {
log(`connected to zkserver ${register}`);
clearTimeout(timeId);
resolve(null);
msg.emit('sys:ready');
traceInfo(`connected to zkserver ${register}`);
});
//the connection between client and server is dropped.
this._client.once('disconnected', () => {
log(`zk ${register} had disconnected`);
const err = new ZookeeperDisconnectedError(
'ZooKeeper was disconnected.',
);
clearTimeout(timeId);
this._subscriber.onError(err);
traceErr(err);
});
//connect
this._client.connect();
});
}
private _watch(dubboServicePath: string, dubboInterface: string) {
//@ts-ignore
return async (e: zookeeper.Event) => {
log(`trigger watch ${dubboServicePath}, type: ${e.getName()}`);
traceInfo(`trigger watch ${dubboServicePath}, type: ${e.getName()}`);
const dubboServiceUrls = await this._getDubboServiceUrls(
dubboServicePath,
dubboInterface,
);
//clear current dubbo interface
this._dubboServiceUrlMap.set(dubboInterface, []);
for (let serviceUrl of dubboServiceUrls) {
const url = DubboUrl.from(serviceUrl);
const {host, port, dubboVersion, version} = url;
this._dubboServiceUrlMap.get(dubboInterface).push(url);
this._createConsumer({
host: host,
port: port,
name: this._props.application.name,
dubboInterface: dubboInterface,
dubboVersion: dubboVersion,
version: version,
}).then(() => log('create consumer finish'));
}
if (isDevEnv) {
log('agentSet:|> %O', this._allAgentAddrSet);
log(
'update dubboInterface %s providerList %O',
dubboInterface,
this._dubboServiceUrlMap.get(dubboInterface),
);
}
this._subscriber.onData(this._allAgentAddrSet);
};
}
private _getChildren = (
path: string,
watch?: (e: zookeeper.Event) => void,
): Promise<{children: Array<string>; stat: zookeeper.Stat}> => {
if (!watch) {
watch = () => {};
}
return new Promise((resolve, reject) => {
this._client.getChildren(path, watch, (err, children, stat) => {
if (err) {
reject(err);
return;
}
resolve({
children,
stat,
});
});
});
};
/**
* com.alibaba.dubbo.registry.zookeeper.ZookeeperRegistry
*/
private async _createConsumer(params: {
host: string;
port: number;
name: string;
dubboInterface: string;
dubboVersion: string;
version: string;
}) {
let {host, port, name, dubboInterface, dubboVersion, version} = params;
const queryParams = {
host,
port,
interface: dubboInterface,
application: name,
category: 'consumers',
dubbo: dubboVersion,
method: '',
revision: '',
version: version,
side: 'consumer',
check: 'false',
timestamp: Date.now(),
};
const consumerRoot = `/dubbo/${dubboInterface}/consumers`;
const err = await this._createRootConsumer(consumerRoot);
if (err) {
log('create root consumer %o', err);
return;
}
const consumerUrl =
consumerRoot +
'/' +
encodeURIComponent(
`consumer://${ipAddress}/${dubboInterface}?${qs.stringify(
queryParams,
)}`,
);
const exist = await to(this._exists(consumerUrl));
if (exist.err || exist.res) {
log(`check consumer url: ${consumerUrl}失败或者consumer已经存在`);
return;
}
const create = await to(
this._create(consumerUrl, zookeeper.CreateMode.EPHEMERAL),
);
if (create.err) {
log(
`check consumer url: ${decodeURIComponent(
consumerUrl,
)}创建consumer失败 %o`,
create.err,
);
return;
}
log(`create successfully consumer url: ${decodeURIComponent(consumerUrl)}`);
}
private async _createRootConsumer(consumer: string) {
const {res, err} = await to(this._exists(consumer));
if (err) {
log(`consumer exisit ${consumer} %o`, err);
return err;
}
//如果没有
if (!res) {
const {err} = await to(
this._create(consumer, zookeeper.CreateMode.PERSISTENT),
);
if (err) {
log(`create consumer#${consumer} successfully`);
return err;
}
}
}
private _create = (path: string, mode: number): Promise<string> => {
return new Promise((resolve, rejec) => {
this._client.create(path, mode, (err, path) => {
if (err) {
rejec(err);
return;
}
resolve(path);
});
});
};
private _exists = (path: string): Promise<zookeeper.Stat> => {
return new Promise((resolve, reject) => {
this._client.exists(path, (err, stat) => {
if (err) {
reject(err);
return;
}
resolve(stat);
});
});
};
}