From e0476d51603432f60b6412b65486166deabe9e08 Mon Sep 17 00:00:00 2001
From: Pjotr Prins
Date: Sat, 7 Aug 2021 12:06:49 +0200
Subject: Add gunicorn support for production

---
 README.md          | 23 ++++++++++++++++++++++-
 gn3/api/general.py |  3 +++
 guix.scm           |  3 ++-
 main.py            |  6 ++++--
 wsgi.py            | 11 +++++++++++
 5 files changed, 42 insertions(+), 4 deletions(-)
 create mode 100644 wsgi.py

diff --git a/README.md b/README.md
index 108dcdb..c3a9848 100644
--- a/README.md
+++ b/README.md
@@ -61,12 +61,33 @@ mypy .
 
 #### Running the flask app
 
-To spin up the server:
+To spin up the server on its own (for development):
 
 ```bash
 env FLASK_DEBUG=1 FLASK_APP="main.py" flask run --port=8080
 ```
 
+And test with
+
+```
+curl localhost:8080/api/version
+"1.0"
+```
+
+To run with gunicorn
+
+```
+gunicorn --bind 0.0.0.0:8080 wsgi:app
+```
+
+consider the following options for development `--bind 0.0.0.0:$SERVER_PORT --workers=1 --timeout 180 --reload wsgi`.
+
+And for the scalable production version run
+
+```
+gunicorn --bind 0.0.0.0:8080 --workers 8 --keep-alive 6000 --max-requests 10 --max-requests-jitter 5 --timeout 1200 wsgi:app
+```
+
 ##### Using python-pip
 
 IMPORTANT NOTE: we do not recommend using pip tools, use Guix instead
diff --git a/gn3/api/general.py b/gn3/api/general.py
index cebb2e3..86fb7b7 100644
--- a/gn3/api/general.py
+++ b/gn3/api/general.py
@@ -11,6 +11,9 @@ from gn3.commands import run_cmd
 
 general = Blueprint("general", __name__)
 
+@general.route("/version")
+def version():
+  return jsonify("1.0")
 
 @general.route("/metadata/upload/", methods=["POST"],
                strict_slashes=False)
diff --git a/guix.scm b/guix.scm
index c18f329..f94fe1a 100644
--- a/guix.scm
+++ b/guix.scm
@@ -82,8 +82,9 @@
                       #:recursive? #t
                       #:select? git-file?))
   (propagated-inputs `(("coreutils" ,coreutils)
-                       ("gemma-wrapper" ,gemma-wrapper)
                        ("csvdiff" ,go-github-com-aswinkarthik-csvdiff)
+                       ("gemma-wrapper" ,gemma-wrapper)
+                       ("gunicorn" ,gunicorn)
                        ("python" ,python-wrapper)
                        ("python-bcrypt" ,python-bcrypt)
                        ("python-flask" ,python-flask)
diff --git a/main.py b/main.py
index e3ca41a..a587697 100644
--- a/main.py
+++ b/main.py
@@ -2,6 +2,8 @@
 
 from gn3.app import create_app
 
-
 app = create_app()
-app.run(host="0.0.0.0")
+
+if __name__ == '__main__':
+    print("Starting app...")
+    app.run()
diff --git a/wsgi.py b/wsgi.py
new file mode 100644
index 0000000..d30bc49
--- /dev/null
+++ b/wsgi.py
@@ -0,0 +1,11 @@
+# import main
+
+print("STARTING WSGI APP")
+
+from gn3.app import create_app
+
+app = create_app()
+
+if __name__ == "__main__":
+    print("Starting wsgi app...")
+    app.run()
-- 
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