Factor out code to write uwsgi config files

Instead of this code all existing in keystone inline, factor out into
a dedicated set of functions, and make keystone use this. This drops
uwsgi supporting https directly, but that's not going to be a
supported model going forward once we get to proxy only anyway.

Change-Id: I1d89be1f1b36f26eaf543b99bde6fdc5701474fe

lib/apache

@@ -181,6 +181,59 @@ function reload_apache_server {
     reload_service $APACHE_NAME
 }
 
+function write_uwsgi_config {
+    local file=$1
+    local wsgi=$2
+    local url=$3
+    local http=$4
+    local name=""
+    name=$(basename $wsgi)
+    local socket="/tmp/${name}.socket"
+
+    # always cleanup given that we are using iniset here
+    rm -rf $file
+    iniset "$file" uwsgi wsgi-file "$wsgi"
+    iniset "$file" uwsgi socket "$socket"
+    iniset "$file" uwsgi processes $API_WORKERS
+    # This is running standalone
+    iniset "$file" uwsgi master true
+    # Set die-on-term & exit-on-reload so that uwsgi shuts down
+    iniset "$file" uwsgi die-on-term true
+    iniset "$file" uwsgi exit-on-reload true
+    iniset "$file" uwsgi enable-threads true
+    iniset "$file" uwsgi plugins python
+    # uwsgi recommends this to prevent thundering herd on accept.
+    iniset "$file" uwsgi thunder-lock true
+    # Override the default size for headers from the 4k default.
+    iniset "$file" uwsgi buffer-size 65535
+    # Make sure the client doesn't try to re-use the connection.
+    iniset "$file" uwsgi add-header "Connection: close"
+    # This ensures that file descriptors aren't shared between processes.
+    iniset "$file" uwsgi lazy-apps true
+    iniset "$file" uwsgi chmod-socket 666
+
+    # If we said bind directly to http, then do that and don't start the apache proxy
+    if [[ -n "$http" ]]; then
+        iniset "$file" uwsgi http $http
+    else
+        local apache_conf=""
+        apache_conf=$(apache_site_config_for $name)
+        echo "ProxyPass \"${url}\" \"unix:${socket}|uwsgi://uwsgi-uds-${name}/\"" | sudo tee $apache_conf
+        enable_apache_site $name
+        reload_apache_server
+    fi
+}
+
+function remove_uwsgi_config {
+    local file=$1
+    local wsgi=$2
+    local name=""
+    name=$(basename $wsgi)
+
+    rm -rf $file
+    disable_apache_site $name
+}
+
 # Restore xtrace
 $_XTRACE_LIB_APACHE