fixed #6263, fixed #7460 - ssh: handle MaxSessions

tabby-ssh/src/components/sshTab.component.ts

@@ -84,9 +84,9 @@ export class SSHTabComponent extends BaseTerminalTabComponent {
         super.ngOnInit()
     }
 
-    async setupOneSession (injector: Injector, profile: SSHProfile): Promise<SSHSession> {
+    async setupOneSession (injector: Injector, profile: SSHProfile, multiplex = true): Promise<SSHSession> {
         let session = await this.sshMultiplexer.getSession(profile)
-        if (!session || !profile.options.reuseSession) {
+        if (!multiplex || !session || !profile.options.reuseSession) {
             session = new SSHSession(injector, profile)
 
             if (profile.options.jumpHost) {
@@ -146,11 +146,8 @@ export class SSHTabComponent extends BaseTerminalTabComponent {
 
             try {
                 await session.start()
+            } finally {
                 this.stopSpinner()
-            } catch (e) {
-                this.stopSpinner()
-                this.write(colors.black.bgRed(' X ') + ' ' + colors.red(e.message) + '\r\n')
-                return session
             }
 
             this.sshMultiplexer.addSession(session)
@@ -186,21 +183,14 @@ export class SSHTabComponent extends BaseTerminalTabComponent {
         super.attachSessionHandlers()
     }
 
-    async initializeSession (): Promise<void> {
-        this.reconnectOffered = false
+    private async initializeSessionMaybeMultiplex (multiplex = true): Promise<void> {
         if (!this.profile) {
-            this.logger.error('No SSH connection info supplied')
-            return
-        }
-
-        try {
-            this.sshSession = await this.setupOneSession(this.injector, this.profile)
-        } catch (e) {
-            this.write(colors.black.bgRed(' X ') + ' ' + colors.red(e.message) + '\r\n')
-            return
+            throw new Error('No SSH connection info supplied')
         }
 
+        this.sshSession = await this.setupOneSession(this.injector, this.profile, multiplex)
         const session = new SSHShellSession(this.injector, this.sshSession, this.profile)
+
         this.setSession(session)
         this.attachSessionHandler(session.serviceMessage$, msg => {
             msg = msg.replace(/\n/g, '\r\n      ')
@@ -212,6 +202,20 @@ export class SSHTabComponent extends BaseTerminalTabComponent {
         this.session?.resize(this.size.columns, this.size.rows)
     }
 
+    async initializeSession (): Promise<void> {
+        this.reconnectOffered = false
+        try {
+            await this.initializeSessionMaybeMultiplex(true)
+        } catch {
+            try {
+                await this.initializeSessionMaybeMultiplex(false)
+            } catch (e) {
+                this.write(colors.black.bgRed(' X ') + ' ' + colors.red(e.message) + '\r\n')
+                return
+            }
+        }
+    }
+
     async getRecoveryToken (options?: GetRecoveryTokenOptions): Promise<RecoveryToken> {
         return {
             type: 'app:ssh-tab',

tabby-ssh/src/services/sshMultiplexer.service.ts

@@ -15,7 +15,9 @@ export class SSHMultiplexerService {
         const key = await this.getMultiplexerKey(session.profile)
         this.sessions.set(key, session)
         session.willDestroy$.subscribe(() => {
-            this.sessions.delete(key)
+            if (this.sessions.get(key) === session) {
+                this.sessions.delete(key)
+            }
         })
     }
 

tabby-ssh/src/session/shell.ts

@@ -1,5 +1,4 @@
 import { Observable, Subject } from 'rxjs'
-import colors from 'ansi-colors'
 import stripAnsi from 'strip-ansi'
 import { ClientChannel } from 'ssh2'
 import { Injector } from '@angular/core'
@@ -41,11 +40,10 @@ export class SSHShellSession extends BaseSession {
         try {
             this.shell = await this.ssh.openShellChannel({ x11: this.profile.options.x11 ?? false })
         } catch (err) {
-            this.emitServiceMessage(colors.bgRed.black(' X ') + ` Remote rejected opening a shell channel: ${err}`)
             if (err.toString().includes('Unable to request X11')) {
                 this.emitServiceMessage('    Make sure `xauth` is installed on the remote side')
             }
-            return
+            throw new Error(`Remote rejected opening a shell channel: ${err}`)
         }
 
         this.open = true