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import { Injectable } from '@angular/core';
import { Http, Headers, RequestOptionsArgs, Response } from '@angular/http';
import { Location } from '@angular/common';
import { Observable } from 'rxjs/Observable';
import { Subject } from 'rxjs/Subject';
import { BehaviorSubject } from 'rxjs/BehaviorSubject';
import * as io from 'socket.io-client';
import { AlertService } from './alert.service';
// Import RxJs required methods
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/catch';
import 'rxjs/add/observable/throw';
export interface IXDSVersion {
version: string;
apiVersion: string;
gitTag: string;
}
export interface IAgentStatus {
baseURL: string;
connected: boolean;
WS_connected: boolean;
connectionRetry: number;
version: string;
}
// Default settings
const DEFAULT_PORT = 8010;
const DEFAULT_API_KEY = "1234abcezam";
const API_VERSION = "v1";
@Injectable()
export class XDSAgentService {
public Status$: Observable<IAgentStatus>;
private baseRestUrl: string;
private wsUrl: string;
private connectionMaxRetry: number;
private apikey: string;
private _status: IAgentStatus = {
baseURL: "",
connected: false,
WS_connected: false,
connectionRetry: 0,
version: "",
};
private statusSubject = <BehaviorSubject<IAgentStatus>>new BehaviorSubject(this._status);
private socket: SocketIOClient.Socket;
constructor(private http: Http, private _window: Window, private alert: AlertService) {
this.Status$ = this.statusSubject.asObservable();
this.apikey = DEFAULT_API_KEY; // FIXME Add dynamic allocated key
this._status.baseURL = 'http://localhost:' + DEFAULT_PORT;
this.baseRestUrl = this._status.baseURL + '/api/' + API_VERSION;
let re = this._window.location.origin.match(/http[s]?:\/\/([^\/]*)[\/]?/);
if (re === null || re.length < 2) {
console.error('ERROR: cannot determine Websocket url');
} else {
this.wsUrl = 'ws://' + re[1];
}
}
connect(retry: number, url?: string): Observable<IAgentStatus> {
if (url) {
this._status.baseURL = url;
this.baseRestUrl = this._status.baseURL + '/api/' + API_VERSION;
}
//FIXME [XDS-Agent]: not implemented yet, set always as connected
//this._status.connected = false;
this._status.connected = true;
this._status.connectionRetry = 0;
this.connectionMaxRetry = retry || 3600; // 1 hour
// Init IO Socket connection
this._handleIoSocket();
// Get Version in order to check connection via a REST request
return this.getVersion()
.map((v) => {
this._status.version = v.version;
this.statusSubject.next(Object.assign({}, this._status));
return this._status;
});
}
public getVersion(): Observable<IXDSVersion> {
/*FIXME [XDS-Agent]: Not implemented for now
return this._get('/version');
*/
return Observable.of({
version: "NOT_IMPLEMENTED",
apiVersion: "NOT_IMPLEMENTED",
gitTag: "NOT_IMPLEMENTED"
});
}
private _WSState(sts: boolean) {
this._status.WS_connected = sts;
this.statusSubject.next(Object.assign({}, this._status));
}
private _handleIoSocket() {
this.socket = io(this.wsUrl, { transports: ['websocket'] });
this.socket.on('connect_error', (res) => {
this._WSState(false);
console.error('WS Connect_error ', res);
});
this.socket.on('connect', (res) => {
this._WSState(true);
});
this.socket.on('disconnection', (res) => {
this._WSState(false);
this.alert.error('WS disconnection: ' + res);
});
this.socket.on('error', (err) => {
console.error('WS error:', err);
});
}
private _attachAuthHeaders(options?: any) {
options = options || {};
let headers = options.headers || new Headers();
// headers.append('Authorization', 'Basic ' + btoa('username:password'));
headers.append('Access-Control-Allow-Origin', '*');
headers.append('Accept', 'application/json');
headers.append('Content-Type', 'application/json');
if (this.apikey !== "") {
headers.append('X-API-Key', this.apikey);
}
options.headers = headers;
return options;
}
private _checkAlive(): Observable<boolean> {
if (this._status.connected) {
return Observable.of(true);
}
return this.http.get(this._status.baseURL, this._attachAuthHeaders())
.map((r) => this._status.connected = true)
.retryWhen((attempts) => {
this._status.connectionRetry = 0;
return attempts.flatMap(error => {
this._status.connected = false;
if (++this._status.connectionRetry >= this.connectionMaxRetry) {
return Observable.throw("XDS local Agent not responding (url=" + this._status.baseURL + ")");
} else {
return Observable.timer(1000);
}
});
});
}
private _get(url: string): Observable<any> {
return this._checkAlive()
.flatMap(() => this.http.get(this.baseRestUrl + url, this._attachAuthHeaders()))
.map((res: Response) => res.json())
.catch(this._decodeError);
}
private _post(url: string, body: any): Observable<any> {
return this._checkAlive()
.flatMap(() => this.http.post(this.baseRestUrl + url, JSON.stringify(body), this._attachAuthHeaders()))
.map((res: Response) => res.json())
.catch((error) => {
return this._decodeError(error);
});
}
private _delete(url: string): Observable<any> {
return this._checkAlive()
.flatMap(() => this.http.delete(this.baseRestUrl + url, this._attachAuthHeaders()))
.map((res: Response) => res.json())
.catch(this._decodeError);
}
private _decodeError(err: Response | any) {
let e: string;
if (this._status) {
this._status.connected = false;
}
if (typeof err === "object") {
if (err.statusText) {
e = err.statusText;
} else if (err.error) {
e = String(err.error);
} else {
e = JSON.stringify(err);
}
} else if (err instanceof Response) {
const body = err.json() || 'Server error';
const error = body.error || JSON.stringify(body);
e = `${err.status} - ${err.statusText || ''} ${error}`;
} else {
e = err.message ? err.message : err.toString();
}
return Observable.throw(e);
}
}
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