another attempt...

sau/services.py

@@ -74,7 +74,7 @@ def restart_services():
 
     # perform a second check to remove potential false positives
     service_procs = set()
-    retest_procs = {}
+    retest_procs = set()
     for proc in check_procs:
         files = _get_deleted_open_files(proc)
         if not files:
@@ -82,63 +82,32 @@ def restart_services():
             continue
         try:
             exe = proc.exe()
-            parents = proc.parents()
         except (psutil.NoSuchProcess, psutil.ZombieProcess, psutil.AccessDenied):
             # either of the above exceptions means the process has quit
             continue
+        parent = _get_top_parent(proc)
         
-        log.debug('will attempt to restart parent of {}'.format(proc))
-        if len(parents) < 2:
-            log.debug('{} is its own top parent'.format(proc))
-            parent = proc
-        else:
-            log.debug('{} has top parent {}'.format(proc, parents[-2]))
-            parent = parents[-2]
         service_procs.add(parent)
-        retest_procs[proc] = parent
+        retest_procs.add(proc)
 
     processes = {}
     services = {}
     for proc in service_procs:
         try:
             service_exe = proc.exe()
-            proc_name = proc.name()
         except (psutil.NoSuchProcess, psutil.ZombieProcess, psutil.AccessDenied):
             log.debug('{} died before it could be restarted'.format(proc))
             continue
-
+        service_name = _get_service_from_proc(proc)
-        if proc_name in services:
-            processes[services[proc_name]].append(proc)
-            # we have already checked a process with this name
-            continue
-
-        service_name = conf.get('processes', proc_name, fallback=None)
-        if service_name == '':
-            log.debug('Ignoring process {}'.format(proc))
-            del retest_procs[proc]
-            continue
 
         if not service_name:
-            # if the exe file has been deleted since started, service_exe will be empty
+            log.debug('no service for process {}'.format(proc))
-            # and we'll have to guess
-            if not service_exe:
-                log.debug('Could not get full path to executable for process {}, will attempt to guess'.format(proc))
-                service_exe = get_exe_file(service_name)
-            if not service_exe:
-                log.error('Failed to find executable for process {}'.format(proc))
-                continue
-
-            try: 
-                service_name = platform.identify_service_from_bin(service_exe)
-            except sau.errors.UnknownServiceError:
-                log.warning('Could not find service for process {}'.format(proc))
             continue
 
         services[proc_name] = service_name
         processes[service_name] = [proc]
 
-    for service_all in [x for x in services.values() if x]:
+    for service in set([x for x in services.values() if x]):
-        for service in service_all.split():
         policy = _get_service_restart_policy(service)
         if policy == 'ignore':
             log.info('Service "{}" ignored by configuration'.format(service))
@@ -152,20 +121,32 @@ def restart_services():
         platform.restart_service(service)
 
     recommend_restart = False
-    for proc, parent in retest_procs.items():
+    tested_parents = set()
+    for proc in retest_procs:
         try:
             name = proc.name()
         except (psutil.NoSuchProcess, psutil.ZombieProcess, psutil.AccessDenied):
             log.debug('{} was successfully killed'.format(proc))
             continue
+        parent = _get_top_parent(proc)
+        if parent in tested_parents:
+            log.debug('{} belongs to already tested parent {}'.format(proc, parent))
+            continue
 
         if _get_deleted_open_files(proc):
-            if name in services and not services[name]:
+            tested_parents.add(parent)
+            service = _get_service_from_proc(parent)
+            if not service:
+                log.warning('could not re-check process {} - failed to identify service'.format(proc))
+                recommend_restart = True
+                continue
+
+            if service in services and not services[service]:
                 log.warning('{} (parent {}) does not belong to a service and could not be restarted'.format(proc, parent))
                 recommend_restart = True
                 continue
-            elif name in services:
+            elif service in services:
-                policy = _get_service_restart_policy(services[parent.name()])
+                policy = _get_service_restart_policy(service)
                 if policy in ('ignore', 'warn'):
                     continue
             log.warning('{} (parent {}) still has deleted files open'.format(proc, parent))
@@ -186,3 +167,54 @@ def _get_service_restart_policy(service):
         return default_policy.lower()
     log.warning('default service policy {} is invalid'.format(default_policy))
     return 'warn'
+
+def _get_service_from_proc(proc):
+    conf = sau.config
+    platform = sau.platforms.get_platform()
+    proc = _get_top_parent(proc)
+    log = logging.getLogger(sau.LOGNAME)
+    try:
+        proc_name = proc.name()
+        service_exe = proc.exe()
+    except (psutil.NoSuchProcess, psutil.ZombieProcess, psutil.AccessDenied):
+        log.debug('{} died'.format(proc))
+        return None
+
+    service_name = conf.get('processes', proc_name, fallback=None)
+    if service_name == '':
+        log.debug('Ignoring process {}'.format(proc))
+        return None
+
+    if not service_name:
+        # if the exe file has been deleted since started, service_exe will be empty
+        # and we'll have to guess
+        if not service_exe:
+            log.debug('Could not get full path to executable for process {}, will attempt to guess'.format(proc))
+            service_exe = get_exe_file(service_name)
+        if not service_exe:
+            log.error('Failed to find executable for process {}'.format(proc))
+            return None
+
+        try: 
+            service_name = platform.identify_service_from_bin(service_exe)
+        except sau.errors.UnknownServiceError:
+            log.warning('Could not find service for process {}'.format(proc))
+            return None
+    return service_name
+
+def _get_top_parent(proc):
+    log = logging.getLogger(sau.LOGNAME)
+    try:
+        parents = proc.parents()
+    except (psutil.NoSuchProcess, psutil.ZombieProcess, psutil.AccessDenied):
+        # either of the above exceptions means the process has quit
+        return None
+    
+    if len(parents) < 2:
+        log.debug('{} is its own top parent'.format(proc))
+        parent = proc
+    else:
+        log.debug('{} has top parent {}'.format(proc, parents[-2]))
+        parent = parents[-2]
+    
+    return parent