add uwsgi startup script with watcher for development

Author: haarg

Diff for: Dockerfile

@@ -17,7 +17,8 @@ RUN \
       'libcap-dev (>= 1:2.66)' \
       'libpcre3-dev (>= 2:8.39)' \
       'uwsgi-core (>= 2.0.21)' \
-      'uwsgi-src (>= 2.0.21)'
+      'uwsgi-src (>= 2.0.21)' \
+      'inotify-tools (>= 3.22.6.0)'
 
     /usr/bin/uwsgi --build-plugin "/usr/src/uwsgi/plugins/psgi"
 EOT
@@ -56,4 +57,5 @@ EOT
 COPY --from=build-uwsgi /psgi_plugin.so /usr/lib/uwsgi/plugins/psgi_plugin.so
 COPY --from=build-perl /usr/local/lib/perl5 /usr/local/lib/perl5
 COPY --from=build-perl /usr/local/bin /usr/local/bin
-COPY wait-for-it.sh /
+COPY watcher.sh uwsgi.sh wait-for-it.sh /
+COPY uwsgi.ini /etc/uwsgi.ini

Diff for: uwsgi.ini

@@ -0,0 +1,6 @@
+[uwsgi]
+master = true
+workers = 20
+early-psgi = true
+perl-no-die-catch = true
+disable-logging = true

Diff for: uwsgi.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+script_dir="$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+pid="$$"
+uwsgi_ini="/etc/uwsgi.ini"
+
+if [[ "$PLACK_ENV" == "development" ]]; then
+    if [[ -e '/etc/uwsgi-development.ini' ]]; then
+        uwsgi_ini="/etc/uwsgi-development.ini"
+    fi
+    (
+        set -m
+        "$script_dir/watcher.sh" "$pid" lib *.conf &
+    )
+fi
+
+exec /usr/bin/uwsgi \
+    --plugins psgi \
+    --http-socket-modifier1 5 \
+    --ini /etc/uwsgi.ini \
+    "$@" \
+    --psgi app.psgi

Diff for: watcher.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -euo pipefail
+
+pid="$1"
+shift
+
+inotifywait --event create --event delete --event modify --event move \
+    -m --format '%w%f' -r "$@" | \
+while read modify; do
+    printf '%s\n' "Detected change to $modify, reloading uWSGI..."
+    kill -HUP "$pid"
+done