Add gunicorn

Makefile

@@ -41,8 +41,13 @@ check:
 clean: check
 	- rm *.txt
 
-run:
+## run.dev: run Flask debug server
+run.dev:
 	flask --app 'calibre_rest:create_app("dev")' run --debug
 
+## run gunicorn server
+run:
+	gunicorn 'calibre_rest:create_app("prod")' -c gunicorn.py
+
 test:
 	pytest -v

calibre_rest/calibre.py

@@ -242,7 +242,6 @@ def add_empty(self, **kwargs: Any) -> list[int]:
         else:
             return []
 
-    # TODO handle when passing multiple of the same flag
     def _handle_add_flags(self, cmd: str, kwargs: Any):
         for flag in self.ADD_FLAGS:
             value = kwargs.get(flag)

gunicorn.py

@@ -0,0 +1,28 @@
+from multiprocessing import cpu_count
+
+bind = "0.0.0.0:5000"
+
+# Maximum number of backlog requests to hold onto before users get error messages.
+backlog = 100
+# workers = cpu_count() * 2 + 1
+workers = 2
+
+# Do not support persistent connections. Close after each request.
+worker_class = "sync"
+
+timeout = 30
+keepalive = 2
+spew = False
+daemon = False
+raw_env = []
+
+pidfile = "/tmp/gunicorn_vm_api.pid"
+
+umask = 755
+user = 1000
+group = 1000
+tmp_upload_directory = None
+
+# Log errors received to stdout with `-`
+error_log = "-"
+access_log = "-"

requirements.in

@@ -1,2 +1,3 @@
 flask
 jsonschema
+gunicorn

requirements.txt

@@ -20,6 +20,10 @@ flask==2.3.2 \
     --hash=sha256:77fd4e1249d8c9923de34907236b747ced06e5467ecac1a7bb7115ae0e9670b0 \
     --hash=sha256:8c2f9abd47a9e8df7f0c3f091ce9497d011dc3b31effcf4c85a6e2b50f4114ef
     # via -r requirements.in
+gunicorn==20.1.0 \
+    --hash=sha256:9dcc4547dbb1cb284accfb15ab5667a0e5d1881cc443e0677b4882a4067a807e \
+    --hash=sha256:e0a968b5ba15f8a328fdfd7ab1fcb5af4470c28aaf7e55df02a99bc13138e6e8
+    # via -r requirements.in
 itsdangerous==2.1.2 \
     --hash=sha256:2c2349112351b88699d8d4b6b075022c0808887cb7ad10069318a8b0bc88db44 \
     --hash=sha256:5dbbc68b317e5e42f327f9021763545dc3fc3bfe22e6deb96aaf1fc38874156a
@@ -119,3 +123,7 @@ werkzeug==2.3.6 \
     --hash=sha256:935539fa1413afbb9195b24880778422ed620c0fc09670945185cce4d91a8890 \
     --hash=sha256:98c774df2f91b05550078891dee5f0eb0cb797a522c757a2452b9cee5b202330
     # via flask
+
+# WARNING: The following packages were not pinned, but pip requires them to be
+# pinned when the requirements file includes hashes. Consider using the --allow-unsafe flag.
+# setuptools