Fixing race condition in server and partial stream handling in frontend. #2391
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This PR fixes two problems:
The race condition was caused by unique_lock scope loss when processing streaming completion. My fix was to handle unlocking of the mutex manually in that case. This bug caused segfaults when handling multiple streaming requests on the completion endpoint.
Partial stream results happen regularly on slower connections, or when the server is generating messages very quickly. The fix was to handle leftover data in the llama generator function. This bug caused completion messages to be garbled in several cases.