feat: sse log on specific pipeline

pipeline/routers/logs.py

@@ -1,8 +1,8 @@
-# routers/logs.py
 import asyncio
 from fastapi import APIRouter, Request, Depends
 from sse_starlette.sse import EventSourceResponse
 from loguru import logger
+from uuid import UUID
 
 from dependencies import get_sse_log_queue
 
@@ -12,42 +12,71 @@ router = APIRouter(
 )
 
 
-async def log_stream_generator(request: Request, queue: asyncio.Queue):
+async def pipeline_log_stream_generator(
+    request: Request, queue: asyncio.Queue, target_pipeline_id: str
+):
     """Generates SSE messages from the log queue."""
-    logger.info("SSE client connected for log streaming.")
+    logger.info(
+        f"SSE client connected for log streaming for pipeline_id: {target_pipeline_id}"
+    )
+    yield {
+        "event": "info",
+        "data": f"Streaming logs for pipeline {target_pipeline_id}...",
+    }
+
     while True:
         try:
             if await request.is_disconnected():
-                logger.info("SSE client disconnected.")
+                logger.info(
+                    f"SSE client disconnected for pipeline_id: {target_pipeline_id}"
+                )
                 break
 
-            log_message = await queue.get()
-            yield {"event": "log", "data": log_message}
+            raw_message = await queue.get()
+
+            try:
+                yield {"event": "log", "data": raw_message}
+            except Exception as parse_err:
+                logger.error(f"Error processing log message: {parse_err}")
+                yield {"event": "error", "data": f"Error processing log: {parse_err}"}
 
             queue.task_done()
 
         except asyncio.CancelledError:
-            logger.info("Log stream task cancelled (client likely disconnected).")
+            logger.info(
+                f"Log stream task cancelled for pipeline_id: {target_pipeline_id}"
+            )
             break
         except Exception as e:
-            logger.error(f"Error in SSE log generator: {e}", exc_info=True)
+            logger.error(
+                f"Error in SSE log generator for pipeline {target_pipeline_id}: {e}",
+                exc_info=True,
+            )
             try:
                 yield {"event": "error", "data": f"Log streaming error: {e}"}
-            except Exception:  # Ignore if yield fails (client might be gone)
-                pass
-            await asyncio.sleep(1)  # Avoid tight loop on persistent error
+            except Exception as e:
+                logger.error(f"Error sending error event: {e}")
+            await asyncio.sleep(1)
 
 
-@router.get("/stream", summary="Stream application logs via SSE")
-async def stream_logs(
-    request: Request, queue: asyncio.Queue = Depends(get_sse_log_queue)
+@router.get("/stream/{pipeline_id}", summary="Stream specific pipeline logs via SSE")
+async def stream_pipeline_logs(
+    pipeline_id: UUID,
+    request: Request,
+    queue: asyncio.Queue = Depends(get_sse_log_queue),
 ):
     """
-    Establishes a Server-Sent Events (SSE) connection to stream application logs.
+    Establishes an SSE connection to stream logs for a *specific pipeline run*.
+
+    Connect to this endpoint while a pipeline is running (or shortly after)
+    to see its logs.
 
     Events:
-    - **event: log**: Contains a single log entry as string data.
-    - **event: error**: Sent if an error occurs during streaming.
+    - **event: info**: Connection established message.
+    - **event: log**: Contains a single log entry string for the specified pipeline.
+    - **event: error**: Sent if an error occurs.
     """
-    event_generator = log_stream_generator(request, queue)
+    pipeline_id_str = str(pipeline_id)
+
+    event_generator = pipeline_log_stream_generator(request, queue, pipeline_id_str)
     return EventSourceResponse(event_generator)