LoggerMiddleware not outputting anything

[drnextgis]

When I run titiler with debug enabled:

$ TITILER_API_DEBUG=1 uvicorn titiler.main:app --reload

I expect to see something printed in stdout but there is nothing.

[vincentsarago]

can you try with --log-level debug ?

[drnextgis]

same thing:

$ TITILER_API_DEBUG=1 uvicorn titiler.main:app --reload --log-level debug
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [24825] using watchgod
INFO:     Started server process [24827]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
INFO:     127.0.0.1:44610 - "GET /cog/info?url=https%3A%2F%2Fgithub.com%2Fmapbox%2Frasterio%2Fblob%2Fmaster%2Ftests%2Fdata%2FRGB2.byte.tif%3Fraw%3Dtrue HTTP/1.1" 200 OK
INFO:     127.0.0.1:44984 - "GET /healthz HTTP/1.1" 200 OK

[drnextgis]

@vincentsarago what do you think about this fix?

diff --git a/titiler/middleware.py b/titiler/middleware.py
index d3c5841..9b90c41 100644
--- a/titiler/middleware.py
+++ b/titiler/middleware.py
@@ -58,6 +58,7 @@ class LoggerMiddleware(BaseHTTPMiddleware):
         super().__init__(app)
         self.logger = logger
         logger.setLevel(logging.DEBUG)
+        logger.addHandler(logging.StreamHandler())
 
         self.querystrings = querystrings
         self.headers = headers

[vincentsarago]

@drnextgis I think this is a Uvicorn bug.
ref: fastapi/fastapi#2019

The current implementation works fine when not using uvicorn (e.g. in AWS Lambda)

I've been able to print the logs by using a config file

version: 1
  
disable_existing_loggers: False

formatters:
  console:
    format: "%(levelname)s\t%(name)s\t%(message)s"

handlers:
  console:
    class: logging.StreamHandler
    formatter: console
    stream: ext://sys.stderr
    level: 0

root:
  handlers: [ console ]
  level: 0

TITILER_API_DEBUG=TRUE uvicorn titiler.main:app --reload --log-config log-config.yaml

ref: encode/uvicorn#944

I'm going to close this issue because I believe this is not related to TiTiler itself.