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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, {State} from 'node-zookeeper-client';
import qs from 'querystring';
import DubboUrl from '../dubbo-url';
import {
ZookeeperDisconnectedError,
ZookeeperExpiredError,
ZookeeperTimeoutError,
} from '../err';
import {go} from '../go';
import {
ICreateConsumerParam,
IDubboRegistryProps,
IZkClientProps,
} from '../types';
import {eqSet, isDevEnv, msg, traceErr} from '../util';
import Registry from './registry';
const log = debug('dubbo:zookeeper');
const ipAddress = ip.address();
const CHECK_TIME = 30 * 1000;
export class ZkRegistry extends Registry<IZkClientProps & IDubboRegistryProps> {
constructor(props: IZkClientProps & IDubboRegistryProps) {
super(props);
log(`new:|> %O`, props);
//默认dubbo
this._props.zkRoot = this._props.zkRoot || 'dubbo';
//初始化agentAddrSet
this._agentAddrSet = new Set();
//初始化zookeeper的client
this._connect(this._init);
}
private _checkTimer: NodeJS.Timer;
private _client: zookeeper.Client;
private _agentAddrSet: Set<string>;
//========================private method==========================
private _init = async (err: Error) => {
//zookeeper occur error
if (err) {
log(err);
traceErr(err);
this._subscriber.onError(err);
return;
}
//zookeeper connected(may be occur many times)
const {
zkRoot,
application: {name},
interfaces,
} = this._props;
//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 {res: dubboServiceUrls, err} = await go(
this._getDubboServiceUrls(dubboServicePath, inf),
);
if (err) {
log(`getChildren ${dubboServicePath} error ${err}`);
traceErr(err);
}
//init
this._dubboServiceUrlMap.set(inf, []);
for (let serviceUrl of dubboServiceUrls) {
const url = DubboUrl.from(serviceUrl);
this._dubboServiceUrlMap.get(inf).push(url);
}
//写入consumer信息
this._createConsumer({
name: name,
dubboInterface: inf,
}).then(() => log('create Consumer finish'));
}
if (isDevEnv) {
log('agentAddrSet: %O', this._allAgentAddrSet);
log('dubboServiceUrl:|> %O', this._dubboServiceUrlMap);
}
this._agentAddrSet = this._allAgentAddrSet;
this._subscriber.onData(this._allAgentAddrSet);
};
/**
* 重连
*/
private _reconnect() {
if (this._client) {
this._client.close();
}
this._connect(this._init);
}
/**
* 由于zk自己的监测机制不明确, 改为自主检测
*/
private _monitor() {
clearInterval(this._checkTimer);
this._checkTimer = setInterval(() => {
const state = this._client.getState();
switch (state) {
case State.EXPIRED:
case State.DISCONNECTED:
log(`checker is error, state is ${state}, need reconnect`);
this._reconnect();
break;
default:
log(`checker is ok, state is ${state}`);
}
}, CHECK_TIME);
}
/**
* 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() as Set<string>;
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>> {
return this._getChildren(
dubboServicePath,
this._watchWrap(dubboServicePath, dubboInterface),
).then(res => {
return (res.children || [])
.map(child => decodeURIComponent(child))
.filter(child => child.startsWith('dubbo://'));
});
}
//========================zookeeper helper=========================
/**
* connect zookeeper
*/
private _connect = (callback: (err: Error) => void) => {
const {url: register} = this._props;
//debug log
log(`connecting zkserver ${register}`);
//connect
this._client = zookeeper.createClient(register, {
retries: 10,
});
//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 timeId = setTimeout(() => {
log(`Could not connect zk ${register}, time out`);
this._client.close();
callback(
new ZookeeperTimeoutError(
`ZooKeeper was connected ${register} time out. `,
),
);
}, 30 * 1000);
this._client.once('connected', () => {
log(`connected to zkserver ${register}`);
clearTimeout(timeId);
callback(null);
msg.emit('sys:ready');
this._monitor();
});
//the connection between client and server is dropped.
this._client.on('disconnected', () => {
log(`zk ${register} had disconnected`);
clearTimeout(timeId);
callback(
new ZookeeperDisconnectedError(
`ZooKeeper was disconnected. current state is ${this._client.getState()} `,
),
);
});
this._client.on('expired', () => {
log(`zk ${register} had session expired`);
callback(
new ZookeeperExpiredError(
`Zookeeper was session Expired Error current state ${this._client.getState()}`,
),
);
});
//connect
this._client.connect();
};
private _watchWrap(dubboServicePath: string, dubboInterface: string) {
return async (e: zookeeper.Event) => {
log(`trigger watch ${e}`);
//会有概率性的查询节点为空,可以延时一些时间
// await delay(2000);
const {res: dubboServiceUrls, err} = await go(
this._getDubboServiceUrls(dubboServicePath, dubboInterface),
);
// when getChildren had occur error
if (err) {
log(`getChildren ${dubboServicePath} error ${err}`);
traceErr(err);
return;
}
//clear current dubbo interface
const agentAddrList = [];
const urls = [];
for (let serviceUrl of dubboServiceUrls) {
const url = DubboUrl.from(serviceUrl);
const {host, port} = url;
agentAddrList.push(`${host}:${port}`);
urls.push(url);
}
this._createConsumer({
name: this._props.application.name,
dubboInterface: dubboInterface,
}).then(() => log('create consumer finish'));
this._dubboServiceUrlMap.set(dubboInterface, urls);
if (agentAddrList.length === 0) {
traceErr(new Error(`trigger watch ${e} agentList is empty`));
}
if (isDevEnv) {
log('agentSet:|> %O', this._allAgentAddrSet);
log(
'update dubboInterface %s providerList %O',
dubboInterface,
this._dubboServiceUrlMap.get(dubboInterface),
);
}
if (!eqSet(this._agentAddrSet, this._allAgentAddrSet)) {
this._agentAddrSet = this._allAgentAddrSet;
this._subscriber.onData(this._allAgentAddrSet);
} else {
log('no agent change');
}
};
}
private _getChildren = (
path: string,
watch: (e: zookeeper.Event) => void,
): Promise<{children: Array<string>; stat: zookeeper.Stat}> => {
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: ICreateConsumerParam) {
let {name, dubboInterface} = params;
const dubboSetting = this._props.dubboSetting.getDubboSetting(
dubboInterface,
);
if (!dubboSetting) {
throw new Error(
`Could not find group, version for ${dubboInterface} please check your dubbo setting`,
);
}
const queryParams = {
interface: dubboInterface,
application: name,
category: 'consumers',
method: '',
revision: '',
version: dubboSetting.version,
group: dubboSetting.group,
side: 'consumer',
check: 'false',
};
//create root comsumer
const consumerRoot = `/${this._props.zkRoot}/${dubboInterface}/consumers`;
const err = await this._createRootConsumer(consumerRoot);
if (err) {
log('create root consumer: error %o', err);
return;
}
//create comsumer
const consumerUrl =
consumerRoot +
'/' +
encodeURIComponent(
`consumer://${ipAddress}/${dubboInterface}?${qs.stringify(
queryParams,
)}`,
);
const exist = await go(this._exists(consumerUrl));
if (exist.err) {
log(`check consumer url: ${decodeURIComponent(consumerUrl)} failed`);
return;
}
if (exist.res) {
log(
`check consumer url: ${decodeURIComponent(consumerUrl)} was existed.`,
);
return;
}
const create = await go(
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) {
let {res, err} = await go(this._exists(consumer));
//check error
if (err) {
return err;
}
// current consumer root path was existed.
if (res) {
return null;
}
//create current consumer path
({err} = await go(this._create(consumer, zookeeper.CreateMode.PERSISTENT)));
if (err) {
return err;
}
log('create root comsumer %s successfull', consumer);
}
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);
});
});
};
}
export default function Zk(props: IZkClientProps) {
return (dubboProps: IDubboRegistryProps) =>
new ZkRegistry({
...props,
...dubboProps,
});
}