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codex/codex-rs/app-server/src
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Owen Lin 8d97b5c246 fix(app-server): surface more helpful errors for json-rpc (#11638)
Propagate client JSON-RPC errors for app-server request callbacks.
Previously a number of possible errors were collapsed to `channel
closed`. Now we should be able to see the underlying client error.

### Summary
This change stops masking client JSON-RPC error responses as generic
callback cancellation in app-server server->client request flows.

Previously, when the client responded with a JSON-RPC error, we removed
the callback entry but did not send anything to the waiting oneshot
receiver. Waiters then observed channel closure (for example, auth
refresh request canceled: channel closed), which hid the actual client
error.

Now, client JSON-RPC errors are forwarded through the callback channel
and handled explicitly by request consumers.

### User-visible behavior
- External auth refresh now surfaces real client JSON-RPC errors when
provided.
- True transport/callback-drop cases still report
canceled/channel-closed semantics.

### Example: client JSON-RPC error is now propagated (not masked as
"canceled")

When app-server asks the client to refresh ChatGPT auth tokens, it sends
a server->client JSON-RPC request like:

```json
{
  "id": 42,
  "method": "account/chatgptAuthTokens/refresh",
  "params": {
    "reason": "unauthorized",
    "previousAccountId": "org-abc"
  }
}
```

If the client cannot refresh and responds with a JSON-RPC error:
```
{
  "id": 42,
  "error": {
    "code": -32000,
    "message": "refresh failed",
    "data": null
  }
}
```

app-server now forwards that error through the callback path and
surfaces:
`auth refresh request failed: code=-32000 message=refresh failed`

Previously, this same case could be reported as:
`auth refresh request canceled: channel closed`
8d97b5c246 ยท 2026-02-13 00:14:55 +00:00
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