Merge pull request #944 from MyGO-Mujica/fix/foreground-fallback-channel-outage

fix(foreground-fallback): trigger fallback for unavailable relay channels (#943)

src/hooks/foreground-fallback/index.test.ts

@@ -194,6 +194,27 @@ describe('isFailoverError', () => {
   test('returns true for "forbidden" (lowercase) in message', () => {
     expect(isRetryableError({ message: 'forbidden' })).toBe(true);
   });
+
+  test('returns true for NewAPI "no available channel" error shapes', () => {
+    const message =
+      'No available channel for model gpt-5.6-luna under group Codex专用 (distributor) (request id: abc123)';
+
+    expect(isRetryableError(message)).toBe(true);
+    expect(isRetryableError({ message })).toBe(true);
+    expect(
+      isRetryableError({
+        data: { statusCode: 400, responseBody: message },
+      }),
+    ).toBe(true);
+  });
+
+  test('returns false for permanent channel-not-found errors', () => {
+    expect(
+      isRetryableError({
+        message: 'channel not found for model gpt-5.6-luna',
+      }),
+    ).toBe(false);
+  });
 });
 
 // ---------------------------------------------------------------------------
@@ -269,6 +290,42 @@ describe('ForegroundFallbackManager session.error', () => {
     expect(call[0].model.modelID).toBe('gpt-4o');
   });
 
+  test('triggers fallback on unavailable provider channel session.error', async () => {
+    await mgr.handleEvent({
+      type: 'message.updated',
+      properties: {
+        info: {
+          sessionID: 'sess-1',
+          providerID: 'anthropic',
+          modelID: 'claude-opus-4-5',
+          role: 'assistant',
+        },
+      },
+    });
+
+    await mgr.handleEvent({
+      type: 'session.error',
+      properties: {
+        sessionID: 'sess-1',
+        error: {
+          message:
+            'No available channel for model gpt-5.6-luna under group Codex专用 (distributor)',
+        },
+      },
+    });
+
+    expect(mocks.abort).not.toHaveBeenCalled();
+    expect(mocks.promptAsync).toHaveBeenCalledTimes(1);
+
+    const call = mocks.promptAsync.mock.calls[0] as [
+      {
+        body: { model: { providerID: string; modelID: string } };
+      },
+    ];
+    expect(call[0].body.model.providerID).toBe('openai');
+    expect(call[0].body.model.modelID).toBe('gpt-4o');
+  });
+
   test('marks the replayed user prompt as an internal initiator', async () => {
     await mgr.handleEvent({
       type: 'message.updated',

src/hooks/foreground-fallback/index.ts

@@ -81,6 +81,7 @@ const PROVIDER_OUTAGE_PATTERNS = [
   /\bupstream outage\b/i,
   /\bprovider outage\b/i,
   /\bprovider unavailable\b/i,
+  /\bno available channel/i,
   /\bmodel\b.*\bnot available\b/i,
   /\bmodel is not available\b/i,
   /\bunsupported model\b/i,