Add /logs/raw and /logs/subscribe for getting logs on frontend

Hijacks stderr/stdout to send all output data to the client on flush

api_server/routes/internal/internal_routes.py

@@ -2,6 +2,7 @@ from aiohttp import web
 from typing import Optional
 from folder_paths import models_dir, user_directory, output_directory, folder_names_and_paths
 from api_server.services.file_service import FileService
+from api_server.services.terminal_service import TerminalService
 import app.logger
 
 class InternalRoutes:
@@ -11,7 +12,8 @@ class InternalRoutes:
     Check README.md for more information.
     
     '''
-    def __init__(self):
+
+    def __init__(self, prompt_server):
         self.routes: web.RouteTableDef = web.RouteTableDef()
         self._app: Optional[web.Application] = None
         self.file_service = FileService({
@@ -19,6 +21,8 @@ class InternalRoutes:
             "user": user_directory,
             "output": output_directory
         })
+        self.prompt_server = prompt_server
+        self.terminal_service = TerminalService(prompt_server)
 
     def setup_routes(self):
         @self.routes.get('/files')
@@ -34,7 +38,28 @@ class InternalRoutes:
 
         @self.routes.get('/logs')
         async def get_logs(request):
-            return web.json_response(app.logger.get_logs())
+            return web.json_response([(l["t"] + " - " + l["m"]) for l in app.logger.get_logs()])
+
+        @self.routes.get('/logs/raw')
+        async def get_logs(request):
+            self.terminal_service.update_size()
+            return web.json_response({
+                "entries": list(app.logger.get_logs()),
+                "size": {"cols": self.terminal_service.cols, "rows": self.terminal_service.rows}
+            })
+
+        @self.routes.patch('/logs/subscribe')
+        async def subscribe_logs(request):
+            json_data = await request.json()
+            client_id = json_data["clientId"]
+            enabled = json_data["enabled"]
+            if enabled:
+                self.terminal_service.subscribe(client_id)
+            else:
+                self.terminal_service.unsubscribe(client_id)
+
+            return web.Response(status=200)
+
 
         @self.routes.get('/folder_paths')
         async def get_folder_paths(request):

api_server/services/terminal_service.py

@@ -0,0 +1,63 @@
+import asyncio
+from app.logger import on_flush
+import os
+
+
+class TerminalService:
+    def __init__(self, server):
+        self.server = server
+        self.cols = None
+        self.rows = None
+        self.subscriptions = set()
+        on_flush(self.send_messages_sync)
+
+    def update_size(self):
+        sz = os.get_terminal_size()
+        changed = False
+        if sz.columns != self.cols:
+            self.cols = sz.columns
+            changed = True 
+
+        if sz.lines != self.rows:
+            self.rows = sz.lines
+            changed = True
+
+        if changed:
+            return {"cols": self.cols, "rows": self.rows}
+
+        return None
+
+    def subscribe(self, client_id):
+        self.subscriptions.add(client_id)
+
+    def unsubscribe(self, client_id):
+        self.subscriptions.discard(client_id)
+
+    def send_messages_sync(self, entries):
+        if not len(entries) or not len(self.subscriptions):
+            return
+        
+        try:
+            loop = asyncio.get_running_loop()
+        except RuntimeError: 
+            loop = None
+
+        if loop and loop.is_running():
+            loop.create_task(self.send_messages(entries))
+        else:
+            asyncio.run(self.send_messages(entries))
+
+    async def send_messages(self, entries):
+        if not len(entries):
+            return
+
+        new_size = self.update_size()
+
+        for client_id in self.subscriptions:
+            if client_id not in self.server.sockets:
+                # Automatically unsub if the socket has disconnected
+                self.unsubscribe(client_id)
+                continue
+
+            await self.server.send_json(
+                "logs", {"entries": entries, "size": new_size}, client_id)

app/logger.py

@@ -1,20 +1,67 @@
-import logging
-from logging.handlers import MemoryHandler
 from collections import deque
+from datetime import datetime
+import io
+import logging
+import sys
+import threading
 
 logs = None
-formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
+stdout_interceptor = None
+stderr_interceptor = None
+
+
+class LogInterceptor(io.TextIOWrapper):
+    def __init__(self, stream,  *args, **kwargs):
+        buffer = stream.buffer
+        encoding = stream.encoding
+        super().__init__(buffer, *args, **kwargs, encoding=encoding)
+        self._lock = threading.Lock()
+        self._flush_callbacks = []
+        self._logs_since_flush = []
+
+    def write(self, data):
+        entry = {"t": datetime.now().isoformat(), "m": data}
+        with self._lock:
+            self._logs_since_flush.append(entry)
+
+            # Simple handling for cr to overwrite the last output if it isnt a full line
+            # else logs just get full of progress messages
+            if isinstance(data, str) and data.startswith("\r") and not logs[-1]["m"].endswith("\n"):
+                logs.pop()
+            logs.append(entry)
+        super().write(data)
+
+    def flush(self):
+        super().flush()
+        for cb in self._flush_callbacks:
+            cb(self._logs_since_flush)
+            self._logs_since_flush = []
+
+    def on_flush(self, callback):
+        self._flush_callbacks.append(callback)
 
 
 def get_logs():
-    return "\n".join([formatter.format(x) for x in logs])
+    return logs
 
 
+def on_flush(callback):
+    stdout_interceptor.on_flush(callback)
+    stderr_interceptor.on_flush(callback)
+
 def setup_logger(log_level: str = 'INFO', capacity: int = 300):
     global logs
     if logs:
         return
 
+    # Override output streams and log to buffer
+    logs = deque(maxlen=capacity)
+
+    global stdout_interceptor
+    global stderr_interceptor
+    stdout_interceptor = sys.stdout = LogInterceptor(sys.stdout)
+    stderr_interceptor = sys.stderr = LogInterceptor(sys.stderr)
+
     # Setup default global logger
     logger = logging.getLogger()
     logger.setLevel(log_level)
@@ -22,10 +69,3 @@ def setup_logger(log_level: str = 'INFO', capacity: int = 300):
     stream_handler = logging.StreamHandler()
     stream_handler.setFormatter(logging.Formatter("%(message)s"))
     logger.addHandler(stream_handler)
-
-    # Create a memory handler with a deque as its buffer
-    logs = deque(maxlen=capacity)
-    memory_handler = MemoryHandler(capacity, flushLevel=logging.INFO)
-    memory_handler.buffer = logs
-    memory_handler.setFormatter(formatter)
-    logger.addHandler(memory_handler)

server.py

@@ -152,7 +152,7 @@ class PromptServer():
         mimetypes.types_map['.js'] = 'application/javascript; charset=utf-8'
 
         self.user_manager = UserManager()
-        self.internal_routes = InternalRoutes()
+        self.internal_routes = InternalRoutes(self)
         self.supports = ["custom_nodes_from_web"]
         self.prompt_queue = None
         self.loop = loop