[common.py,daemon.py,initscript] Ecriture du daemon crans_ticket

common.py

@@ -0,0 +1,6 @@
+#!/usr/bin/env python
+#-*- coding: utf-8 -*-
+PIDFILE = '/var/run/daemon.pid'
+USER='crans_ticket'
+GROUP='adm'
+

daemon.py

@@ -1,18 +1,56 @@
 #!/usr/bin/env python
+# -*- coding: utf-8 -*-
 
+from __future__ import print_function
+import sys,os,pwd,grp
+import common
 import pika
 import json
 import dump
 import config
 
-conn = pika.BlockingConnection(config.PARAMS)
-ch = conn.channel()
-ch.queue_declare(queue='CransTicket')
-def callback(ch, method, properties, body):
-    print " [x] Received %r" % (body,)
-    dump.print_liste(json.loads(body))
+def run():
+	conn = pika.BlockingConnection(config.PARAMS)
+	ch = conn.channel()
+	ch.queue_declare(queue='CransTicket')
+	def callback(ch, method, properties, body):
+    		print (" [x] Received %r" % (body,))
+    		dump.print_liste(json.loads(body))
     
-    
-ch.basic_consume(callback, queue='CransTicket', no_ack=True)
-ch.start_consuming()
-conn.close()
+	ch.basic_consume(callback, queue='CransTicket', no_ack=True)
+	ch.start_consuming()
+	conn.close()
+# fork en arrière plan + pidfile
+
+if __name__ == "__main__":
+    # do the UNIX double-fork magic, see Stevens' "Advanced
+    # Programming in the UNIX Environment" for details (ISBN 0201563177)
+    try:
+        pid = os.fork()
+        if pid > 0:
+            # exit first parent
+            sys.exit(0)
+    except OSError, e:
+        print("fork #1 failed: %d (%s)" % (e.errno, e.strerror),file=sys.stderr)
+        sys.exit(1)
+
+    # decouple from parent environment
+    os.chdir("/")   #don't prevent unmounting....
+    os.setsid()
+    os.umask(0)
+
+    # do second fork
+    try:
+        pid = os.fork()
+        if pid > 0:
+            # exit from second parent, print eventual PID before
+            #print "Daemon PID %d" % pid
+            open(common.PIDFILE, 'w').write("%d" % pid)
+            sys.exit(0)
+    except OSError, e:
+        print("fork #2 failed: %d (%s)" % (e.errno, e.strerror),file=sys.stderr)
+        sys.exit(1)
+
+    # start the daemon main loop
+    run()
+

initscript

@@ -0,0 +1,53 @@
+#! /bin/sh
+### BEGIN INIT INFO
+# Provides:          crans_ticket
+# Required-Start:    $remote_fs
+# Required-Stop:     $remote_fs
+# Default-Start:     2 3 4 5
+# Default-Stop:      0 1 6
+# Short-Description: crans_ticket
+# Description:       Impression thermique
+### END INIT INFO
+
+NAME=crans_ticket
+PIDF=/var/run/$NAME.pid
+BIN_PATH=/usr/local/cransticket
+#ARGS=root@crans.org
+PATH=/sbin:/bin:/usr/sbin:/usr/bin
+BIN="$BIN_PATH/daemon.py"
+DESCR="Script premettant l'impression sur oie"
+
+. /lib/lsb/init-functions
+
+set -e
+
+case "$1" in
+  start)
+	echo -n "Démarrage de $NAME"
+	/sbin/start-stop-daemon --start --quiet --pidfile $PIDF --exec $BIN 
+#$ARGS
+    echo "."
+	;;
+  stop)
+        echo -n "Arrêt de $NAME"
+	/sbin/start-stop-daemon --stop --quiet --oknodo --retry 30 --pidfile $PIDF
+        echo "."
+	;;
+
+  restart)
+        echo -n "Redémarrage (arrêt) de $NAME"
+	/sbin/start-stop-daemon --stop --quiet --oknodo --retry 30 --pidfile $PIDF
+        /bin/sleep 1
+	echo -n "Redémarrage (démarrage) de $NAME"
+	/sbin/start-stop-daemon --start --quiet --pidfile $PIDF --exec $BIN 
+#$ARGS
+        echo "."
+	;;
+
+  *)
+	echo "Usage: /etc/init.d/$NAME {start|stop|restart}"
+	exit 1
+esac
+ 
+exit 0
+