initial commit: working version

ui/src/app/downloads.service.ts

@@ -0,0 +1,79 @@
+import { Injectable } from '@angular/core';
+import { HttpClient, HttpErrorResponse } from '@angular/common/http';
+import { of, Subject } from 'rxjs';
+import { catchError } from 'rxjs/operators';
+import { Socket } from 'ngx-socket-io';
+
+export interface Status {
+  status: string;
+  msg?: string;
+}
+
+interface Download {
+  id: string;
+  title: string;
+  url: string,
+  status: string;
+  percent: number;
+  speed: number;
+  eta: number;
+  checked?: boolean;
+  deleting?: boolean;
+}
+
+@Injectable({
+  providedIn: 'root'
+})
+export class DownloadsService {
+  loading = true;
+  downloads = new Map<string, Download>();
+  dlChanges = new Subject();
+
+  constructor(private http: HttpClient, private socket: Socket) {
+    socket.fromEvent('queue').subscribe((strdata: string) => {
+      this.loading = false;
+      this.downloads.clear();
+      let data: [[string, Download]] = JSON.parse(strdata);
+      data.forEach(entry => this.downloads.set(...entry));
+      this.dlChanges.next();
+    });
+    socket.fromEvent('added').subscribe((strdata: string) => {
+      let data: Download = JSON.parse(strdata);
+      this.downloads.set(data.id, data);
+      this.dlChanges.next();
+    });
+    socket.fromEvent('updated').subscribe((strdata: string) => {
+      let data: Download = JSON.parse(strdata);
+      let dl: Download = this.downloads.get(data.id);
+      data.checked = dl.checked;
+      data.deleting = dl.deleting;
+      this.downloads.set(data.id, data);
+      this.dlChanges.next();
+    });
+    socket.fromEvent('deleted').subscribe((strdata: string) => {
+      let data: string = JSON.parse(strdata);
+      this.downloads.delete(data);
+      this.dlChanges.next();
+    });
+  }
+
+  empty() {
+    return this.downloads.size == 0;
+  }
+
+  handleHTTPError(error: HttpErrorResponse) {
+    var msg = error.error instanceof ErrorEvent ? error.error.message : error.error;
+    return of({status: 'error', msg: msg})
+  }
+
+  public add(url: string) {
+    return this.http.post<Status>('add', {url: url}).pipe(
+      catchError(this.handleHTTPError)
+    );
+  }
+
+  public del(ids: string[]) {
+    ids.forEach(id => this.downloads.get(id).deleting = true);
+    return this.http.post('delete', {ids: ids});
+  }
+}