Add application file

.gitignore

@@ -0,0 +1 @@
+token.txt

main.py

@@ -1,3 +1,4 @@
+import logging
 import os
 import tempfile
 
@@ -7,6 +8,12 @@ from fastapi.responses import FileResponse
 from model import extract_contact
 from vcf import generate_vcf, VCF_DIR
 
+logging.basicConfig(
+    level=logging.INFO,
+    format="%(asctime)s %(levelname)s: %(message)s",
+)
+log = logging.getLogger("cardextractor")
+
 app = FastAPI(title="Business Card Extractor", version="1.0")
 
 
@@ -21,12 +28,17 @@ async def extract(file: UploadFile = File(...)):
     try:
         suffix = os.path.splitext(file.filename)[1]
         with tempfile.NamedTemporaryFile(delete=False, suffix=suffix) as temp:
-            temp.write(await file.read())
+            body = await file.read()
+            temp.write(body)
             image_path = temp.name
+        log.info("received %s (%d bytes) -> %s", file.filename, len(body), image_path)
 
         data = extract_contact(image_path)
+        log.info("extracted: %s", data)
+
         vcf_path = generate_vcf(data)
         filename = os.path.basename(vcf_path)
+        log.info("wrote vcf: %s", filename)
 
         return {
             "success": True,
@@ -35,7 +47,9 @@ async def extract(file: UploadFile = File(...)):
             "download": f"/download/{filename}",
         }
     except Exception as e:
-        raise HTTPException(500, str(e))
+        # ponytail: exc_info dumps the full traceback to the container logs
+        log.exception("extract failed for %s", file.filename)
+        raise HTTPException(500, f"{type(e).__name__}: {e}")
     finally:
         if image_path and os.path.exists(image_path):
             os.remove(image_path)