Rename procman.ProcessManager.call to once.

[software/pymin.git] / pymin / procman.py

diff --git a/pymin/procman.py b/pymin/procman.py
index 359b3c03be686b049fbdf8507360c927badea21d..2955863e9762a8e22d33347748324ce0f306ba0a 100644 (file)
--- a/pymin/procman.py
+++ b/pymin/procman.py
@@ -6,8 +6,8 @@ import signal
 import subprocess
 import logging ; log = logging.getLogger('pymin.procman')
 
-__all__ = ('ProcessManager', 'manager', 'register', 'unregister', 'call',
-           'start', 'stop', 'kill', 'get', 'has', 'sigchild_handler')
+__all__ = ('ProcessManager', 'manager', 'register', 'unregister', 'once',
+           'start', 'stop', 'restart', 'kill', 'get', 'has', 'sigchild_handler')
 
 class ProcessInfo:
     def __init__(self, name, command, callback=None, persist=False,
@@ -27,7 +27,6 @@ class ProcessInfo:
         self.signal = None
         self.process = None
         self.error_count = 0
-        self.running = False
     def start(self):
         assert self.process is None
         self.restart()
@@ -35,7 +34,6 @@ class ProcessInfo:
         self.clear()
         log.debug(u'ProcessInfo.restart(): executing %s', self.command)
         self.process = subprocess.Popen(self.command, *self.args, **self.kwargs)
-        self.running = True
     def stop(self):
         assert self.process is not None
         self.dont_run = True
@@ -51,6 +49,9 @@ class ProcessInfo:
         assert self.process is not None
         os.kill(self.process.pid, signum)
         self.signal = signum
+    @property
+    def running(self):
+        return self.process is not None and self.process.poll() is None
     def __repr__(self):
         pid = None
         if self.process is not None:
@@ -71,6 +72,7 @@ class ProcessManager:
                 max_errors=3, *args, **kwargs):
         log.debug(u'ProcessManager.register(%s, %s, %s, %s, %s, %s, %s)',
                   name, command, callback, persist, max_errors, args, kwargs)
+        assert not self.has(name)
         self.services[name] = ProcessInfo(name, command, callback, persist,
                                           max_errors, args, kwargs)
 
@@ -82,10 +84,11 @@ class ProcessManager:
         pi.start()
         self.namemap[pi.name] = self.pidmap[pi.process.pid] = pi
 
-    def call(self, name, command, callback=None, persist=False,
+    def once(self, name, command, callback=None, persist=False,
                 max_errors=3, *args, **kwargs):
-        log.debug(u'ProcessManager.call(%s, %s, %s, %s, %s, %s, %s)',
+        log.debug(u'ProcessManager.once(%s, %s, %s, %s, %s, %s, %s)',
                   name, command, callback, persist, max_errors, args, kwargs)
+        assert not self.has(name)
         pi = ProcessInfo(name, command, callback, persist, max_errors,
                          args, kwargs)
         self._call(pi)
@@ -102,12 +105,15 @@ class ProcessManager:
 
     def restart(self, name):
         log.debug(u'ProcessManager.restart(%s)', name)
+        # we have to check first in namemap in case is an unregistered
+        # process (added with once())
         if name in self.namemap:
-            self.namemap[name].stop()
-            self.namemap[name].wait()
-            self.namemap[name].restart()
+            pi = self.namemap[name]
+            pi.stop()
+            pi.process.wait()
+            pi.restart()
         else:
-            self.namemap[name].start()
+            self.services[name].start()
 
     def kill(self, name, signum):
         log.debug(u'ProcessManager.kill(%s, %s)', name, signum)
@@ -203,9 +209,10 @@ if __name__ == '__main__':
 manager = ProcessManager()
 register = manager.register
 unregister = manager.unregister
-call = manager.call
+once = manager.once
 start = manager.start
 stop = manager.stop
+restart = manager.restart
 kill = manager.kill
 get = manager.get
 has = manager.has
@@ -236,24 +243,29 @@ if __name__ == '__main__':
                 assert 'test-service-2' not in manager.namemap
                 pm.start('test-service-2')
                 assert 'test-service-2' in manager.namemap
+                assert get('test-service-2').running
         print 'died:', pi.name, pi.command
 
     register('test-service', ('sleep', '2'), notify, True)
     assert 'test-service' in manager.services
     assert 'test-service' not in manager.namemap
+    assert not get('test-service').running
 
     register('test-service-2', ('sleep', '3'), notify, False)
     assert 'test-service-2' in manager.services
     assert 'test-service-2' not in manager.namemap
+    assert not get('test-service-2').running
 
     signal.signal(signal.SIGCHLD, SIGCHLD_handler)
 
-    call('test-once', ('sleep', '5'), notify)
+    once('test-once', ('sleep', '5'), notify)
     assert 'test-once' not in manager.services
     assert 'test-once' in manager.namemap
+    assert get('test-once').running
 
     start('test-service')
     assert 'test-service' in manager.namemap
+    assert get('test-service').running
 
     print "Known processes:", manager.services.keys()
     print "Waiting...", manager.namemap.keys()
@@ -271,3 +283,10 @@ if __name__ == '__main__':
     assert 'test-once' not in manager.services
     assert 'test-once' not in manager.namemap
 
+    once('test-wait', ('sleep', '2'))
+    print 'test-wait returned?', get('test-wait').process.poll()
+    assert get('test-wait').running
+    print 'Waiting test-wait to return...'
+    ret = get('test-wait').process.wait()
+    print 'Done! returned:', ret
+