JIRA: BOTTLENECKS-41 define the documents of vstf in B release

[bottlenecks.git] / vstf / vstf / common / daemon.py

diff --git a/vstf/vstf/common/daemon.py b/vstf/vstf/common/daemon.py
index 1085d36..35933da 100755 (executable)
--- a/vstf/vstf/common/daemon.py
+++ b/vstf/vstf/common/daemon.py
@@ -20,45 +20,46 @@ class Daemon(object):
     
     Usage: subclass the Daemon class and override the run() method
     """
+
     def __init__(self, pidfile, stdin='/dev/null', stdout='/dev/null', stderr='/dev/null'):
         super(Daemon, self).__init__()
         self.stdin = stdin
         self.stdout = stdout
         self.stderr = stderr
         self.pidfile = pidfile
-    
+
     def daemonize(self):
         """
         do the UNIX double-fork magic, see Stevens' "Advanced 
         Programming in the UNIX Environment" for details (ISBN 0201563177)
         http://www.erlenstar.demon.co.uk/unix/faq_2.html#SEC16
         """
-        try: 
-            pid = os.fork() 
+        try:
+            pid = os.fork()
             if pid > 0:
-                sys.exit(0) 
-        except OSError, e: 
+                sys.exit(0)
+        except OSError, e:
             LOG.error("fork #1 failed: %(errno)s, %(strerror)s",
-                      {'errno':e.errno, 'strerror': e.strerror})
+                      {'errno': e.errno, 'strerror': e.strerror})
             sys.exit(1)
-    
+
         # decouple from parent environment
-        os.chdir("/") 
-        os.setsid() 
-        os.umask(0) 
-    
+        os.chdir("/")
+        os.setsid()
+        os.umask(0)
+
         # do second fork
-        try: 
-            pid = os.fork() 
+        try:
+            pid = os.fork()
             if pid > 0:
                 # exit from second parent
-                sys.exit(0) 
-        except OSError, e: 
+                sys.exit(0)
+        except OSError, e:
             LOG.error("fork #1 failed: %(errno)s, %(strerror)s",
-                      {'errno':e.errno, 'strerror': e.strerror})
-            sys.exit(1) 
-    
-        # redirect standard file descriptors
+                      {'errno': e.errno, 'strerror': e.strerror})
+            sys.exit(1)
+
+            # redirect standard file descriptors
         sys.stdout.flush()
         sys.stderr.flush()
         si = file(self.stdin, 'r')
@@ -67,12 +68,12 @@ class Daemon(object):
         os.dup2(si.fileno(), sys.stdin.fileno())
         os.dup2(so.fileno(), sys.stdout.fileno())
         os.dup2(se.fileno(), sys.stderr.fileno())
-    
+
         # write pidfile
         atexit.register(self.delpid)
         pid = str(os.getpid())
-        file(self.pidfile,'w+').write("%s\n" % pid)
-    
+        file(self.pidfile, 'w+').write("%s\n" % pid)
+
     def delpid(self):
         os.remove(self.pidfile)
 
@@ -80,15 +81,15 @@ class Daemon(object):
         """
         Start the daemon
         """
-        
+
         # Check for a pidfile to see if the daemon already runs
         try:
-            pf = file(self.pidfile,'r')
+            pf = file(self.pidfile, 'r')
             pid = int(pf.read().strip())
             pf.close()
         except IOError:
             pid = None
-    
+
         if pid:
             message = "pidfile %s already exist. Daemon already running?\n"
             sys.stderr.write(message % self.pidfile)
@@ -104,16 +105,16 @@ class Daemon(object):
         """
         # Get the pid from the pidfile
         try:
-            pf = file(self.pidfile,'r')
+            pf = file(self.pidfile, 'r')
             pid = int(pf.read().strip())
             pf.close()
         except IOError:
             pid = None
-    
+
         if not pid:
             message = "pidfile %s does not exist. Daemon not running?\n"
             sys.stderr.write(message % self.pidfile)
-            return # not an error in a restart
+            return  # not an error in a restart
 
         # Try killing the daemon process    
         try:
@@ -144,10 +145,10 @@ class Daemon(object):
         
         """
         pass
-        
+
     def daemon_die(self):
-        """You should this method when you shutdown daemon
+        """You should override this method when you shutdown daemon
         this func will be call by stop() before kill the process
         
         """
-        pass
\ No newline at end of file
+        pass