flake: add python project dependencies

2 files changed, 30 insertions, 6 deletions

diff --git a/.gitignore b/.gitignore
index 177ecee..aa78700 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+__pycache__
 development_database
 *~
 *.swp
diff --git a/flake.nix b/flake.nix
index 578bb9b..b49951e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -17,11 +17,18 @@
 
     python = python39;
 
-    develPackagesAndScripts = with python.pkgs; [
-      postgresql_13  # PostgreSQL server with the standard admin tools.
-      ipython        # Interactive Python REPL for experimenting.
-      psycopg2       # PostgreSQL driver for Python
-      embrace        # bridges raw SQL queries to Python functions
+    pythonWithDependencies = python.withPackages (ps: with ps; [
+      uvicorn           # server for the web app
+      fastapi           # simple Python framework to build web apps
+      python-multipart  # to let fastapi handle form submissions
+      passlib           # for account password hashing
+      psycopg2          # PostgreSQL driver for Python
+      embrace           # bridges raw SQL queries to Python functions
+    ]);
+
+    develPackagesAndScripts = [
+      postgresql_13        # PostgreSQL server with the standard admin tools.
+      python.pkgs.ipython  # Interactive Python REPL for experimenting.
 
       # More pleasant alternative to psql, with colours and auto-completion.
       # Custom configuration to suppress irrelevant warnings and messages.
@@ -54,6 +61,20 @@
           -d 2 \
           "$@"
       '')
+
+      # Script for starting the Uvicorn local development server.
+      # `--reload-dir` arguments necessary to prevent the database directory
+      # from triggering automatic application reload.
+      # See: https://github.com/encode/uvicorn/issues/984
+      (writeShellScriptBin "dev-serve" ''
+        uvicorn \
+          --reload-dir app \
+          --reload-dir templates \
+          --reload \
+          --app-dir app \
+          app:main \
+          "$@"
+      '')
     ];
 
     exportEnvVar = k: v: ''export ${k}="${v}"; echo ${k}=\"${v}\"'';
@@ -63,12 +84,14 @@
       PGHOST = "$PWD/development_database";
       PGPORT = "5432";
       PGDATABASE = "app";
+      DATABASE_URL = "postgresql:///${PGDATABASE}?host=${PGHOST}";
+      COOKIE_SECRET_KEY = "insecure for development";
     };
 
   in {
 
     devShell = mkShell rec {
-      buildInputs = develPackagesAndScripts;
+      buildInputs = [ pythonWithDependencies ] ++ develPackagesAndScripts;
 
       shellHook = ''
         echo -e "\nDEVSHELL ENVIRONMENT VARIABLES:"