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1.安装
进入angular工程中， 执行
npm install --save elasticsearch
2.封装api
import { Injectable } from '@angular/core';
import { Client, SearchResponse } from 'elasticsearch';
import { Observable } from 'rxjs/rx';
@Injectable()
export class ElasticSearchService {
private _client: Client;
constructor() {
if (!this._client) {
this.connect();
}
}
private connect(): void {
this._client = new Client({
host: 'http://localhost:9200',
log: 'trace'
});
}
isAvailableAsync(): Observable<SearchResponse<{}>> {
return Observable.fromPromise(<Promise<SearchResponse<{}>>> this._client.ping({
requestTimeout: Infinity
}));
}
searchAsync(value: any): Observable<SearchResponse<{}>> {
if (value) {
console.log(value);
return Observable.fromPromise(<Promise<SearchResponse<{}>>>
this._client.search({index: '.kibana', method: 'get', body: null}));
}
}
isAvailable(): any {
return this._client.ping({
requestTimeout: Infinity
});
}
search(value: any): any {
if (value) {
console.log(value);
return this._client.search({index: '.kibana', method: 'get'});
}
}
}
3.遇到的报错：
a. Error: Request error, retrying POST
http://localhost:9200/.kibana/_search
=> Request failed to complete
上面原因是POST方法，应该改为GET
Elasticsearch ERROR:
Error: Request error, retrying -- connect ECONNREFUSED 127.0.0.1:9200
at Log.error (/usr/src/project/node_modules/elasticsearch/src/lib/log.js:225:56)
Elasticsearch WARNING:
Unable to revive connection:
http://localhost:9200/
Elasticsearch WARNING:
No living connections
Error: No Living connections
at sendReqWithConnection (../node_modules/elasticsearch/src/lib/transport.js:210:15)
at next (../node_modules/elasticsearch/src/lib/connection_pool.js:213:7)
上面原因是跨域问题，
把elasticsearch服务停掉，取es的安装目录里的elasticsearch.yml配置文件中添加如下配置， 然后重新启动es的服务
解决跨域的配置项
http.cors.enabled : true
http.cors.allow-origin : "*"
http.cors.allow-methods : OPTIONS, HEAD, GET, POST, PUT, DELETE
http.cors.allow-headers : X-Requested-With,X-Auth-Token,Content-Type, Content-Length
注意事项：
a,可以把默认的promise封装为Observable接口， 具体实现方式是Async结尾的2个函数， 通过
Observable.fromPromise 做了转换
b.默认的es提供的search的http请求访问为post， 我们根据情况是否指定为GET
c.需要注意跨域访问问题，不然会报错，此时要结合浏览器和es client的trace log综合分析
参考：