[enh] #1326 Spread connection error message

app/modules/crawler/lib/sync.ts

@@ -58,6 +58,7 @@ export class Synchroniser extends stream.Duplex {
     this.watcher.onEvent('wantToLoad',            (data) => this.push({ p2pData: { name: 'wantToLoad', data }}))
     this.watcher.onEvent('beforeReadyNodes',      (data) => this.push({ p2pData: { name: 'beforeReadyNodes', data }}))
     this.watcher.onEvent('syncFailNoNodeFound',   (data) => this.push({ p2pData: { name: 'syncFailNoNodeFound', data }}))
+    this.watcher.onEvent('syncFailCannotConnectToRemote', (data) => this.push({ p2pData: { name: 'syncFailCannotConnectToRemote', data }}))
 
     this.syncStrategy.setWatcher(this.watcher)
 

app/modules/crawler/lib/sync/RemoteSynchronizer.ts

@@ -101,6 +101,7 @@ export class RemoteSynchronizer extends AbstractSynchronizer {
   async init(): Promise<void> {
     const syncApi = await RemoteSynchronizer.getSyncAPI([{ host: this.host, port: this.port }], this.server.conf.pair)
     if (!syncApi.api) {
+      this.watcher.syncFailCannotConnectToRemote()
       throw Error(DataErrors[DataErrors.CANNOT_CONNECT_TO_REMOTE_FOR_SYNC])
     }
     this.currency = syncApi.currency

app/modules/crawler/lib/sync/Watcher.ts

@@ -32,6 +32,8 @@ export interface Watcher {
   beforeReadyNodes(p2pCandidates: P2pCandidate[]): void
 
   syncFailNoNodeFound(): void
+
+  syncFailCannotConnectToRemote(): void
 }
 
 export type EventName = 'downloadChange'|'storageChange'|'appliedChange'|'sbxChange'|'peersChange'
@@ -45,6 +47,7 @@ export type EventName = 'downloadChange'|'storageChange'|'appliedChange'|'sbxCha
   | 'wantToLoad'
   | 'beforeReadyNodes'
   | 'syncFailNoNodeFound'
+  | 'syncFailCannotConnectToRemote'
 
 export class EventWatcher extends events.EventEmitter implements Watcher {
 
@@ -142,6 +145,10 @@ export class EventWatcher extends events.EventEmitter implements Watcher {
   syncFailNoNodeFound(): void {
     this.emit('syncFailNoNodeFound', {})
   }
+
+  syncFailCannotConnectToRemote(): void {
+    this.emit('syncFailCannotConnectToRemote', {})
+  }
 }
 
 export class MultimeterWatcher implements Watcher {
@@ -282,6 +289,9 @@ export class MultimeterWatcher implements Watcher {
   syncFailNoNodeFound(): void {
   }
 
+  syncFailCannotConnectToRemote(): void {
+  }
+
 }
 
 export class LoggerWatcher implements Watcher {
@@ -377,4 +387,7 @@ export class LoggerWatcher implements Watcher {
   syncFailNoNodeFound(): void {
   }
 
+  syncFailCannotConnectToRemote(): void {
+  }
+
 }