From 2aaf83ee88b49e3a10543f8415f73652be606ecc Mon Sep 17 00:00:00 2001
From: Yaroslav Brustinov <ybrustin@cisco.com>
Date: Sun, 5 Jun 2016 17:35:12 +0300
Subject: singleton_daemon:verify RPC connectivity, shutdown the socket for
 immediate close

---
 .../trex_control_plane/server/singleton_daemon.py  | 40 +++++++++++++++++-----
 1 file changed, 31 insertions(+), 9 deletions(-)

(limited to 'scripts/automation/trex_control_plane/server')

diff --git a/scripts/automation/trex_control_plane/server/singleton_daemon.py b/scripts/automation/trex_control_plane/server/singleton_daemon.py
index 7cfbc3bc..81b384c5 100755
--- a/scripts/automation/trex_control_plane/server/singleton_daemon.py
+++ b/scripts/automation/trex_control_plane/server/singleton_daemon.py
@@ -6,6 +6,8 @@ import tempfile
 import types
 from subprocess import Popen
 from time import sleep
+import outer_packages
+import jsonrpclib
 
 # uses Unix sockets for determine running process.
 # (assumes used daemons will register proper socket)
@@ -28,14 +30,14 @@ class SingletonDaemon(object):
 
     # returns True if daemon is running
     def is_running(self):
-        lock_socket = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
         try:
-            lock_socket.bind('\0' + self.tag) # the check is ~200000 faster and more reliable than checking via 'netstat' or 'ps' etc.
+            lock_socket = register_socket(self.tag) # the check is ~200000 faster and more reliable than checking via 'netstat' or 'ps' etc.
+            lock_socket.shutdown(socket.SHUT_RDWR)
             lock_socket.close()
         except socket.error: # Unix socket in use
             return True
         # Unix socket is not used, but maybe it's old version of daemon not using socket
-        return bool(self.get_pid())
+        return bool(self.get_pid_by_listening_port())
 
 
     # get pid of running daemon by registered Unix socket (most robust way)
@@ -73,7 +75,7 @@ class SingletonDaemon(object):
 
 
     # kill daemon
-    def kill(self, timeout = 5):
+    def kill(self, timeout = 10):
         pid = self.get_pid()
         if not pid:
             return False
@@ -88,17 +90,32 @@ class SingletonDaemon(object):
         ret_code, stdout, stderr = run_command('kill -9 %s' % pid) # unconditional kill
         if ret_code:
             raise Exception('Failed to run kill -9 command for %s: %s' % (self.name, [ret_code, stdout, stderr]))
-        poll_rate = 0.1
-        for i in range(inr(timeout / poll_rate)):
+        for i in range(int(timeout / poll_rate)):
             if not self.is_running():
                 return True
             sleep(poll_rate)
         raise Exception('Could not kill %s, even with -9' % self.name)
 
+    # try connection as RPC client, return True upon success, False if fail
+    def check_connectivity(self, timeout = 5):
+        daemon = jsonrpclib.Server('http://127.0.0.1:%s/' % self.port)
+        poll_rate = 0.1
+        for i in range(int(timeout/poll_rate)):
+            try:
+                daemon.not_existing_function_asdfasd()
+            except socket.error: # daemon is not up yet
+                sleep(poll_rate)
+            except Exception as e: # expect error of not supported function
+                if type(e.args) is tuple and\
+                            type(e.args[0]) is tuple and\
+                                e.args[0][0] == -32601: # error code is written hardcoded in JsonRPC Server
+                    return True
+                raise
+        return False
 
     # start daemon
     # returns True if success, False if already running
-    def start(self, timeout = 5):
+    def start(self, timeout = 20):
         if self.is_running():
             raise Exception('%s is already running' % self.name)
         if not self.run_cmd:
@@ -112,6 +129,8 @@ class SingletonDaemon(object):
             if timeout > 0:
                 poll_rate = 0.1
                 for i in range(int(timeout/poll_rate)):
+                    if self.is_running():
+                        break
                     sleep(poll_rate)
                     if bool(proc.poll()): # process ended with error
                         stdout_file.seek(0)
@@ -120,7 +139,9 @@ class SingletonDaemon(object):
                     elif proc.poll() == 0: # process runs other process, and ended
                         break
             if self.is_running():
-                return True
+                if self.check_connectivity():
+                    return True
+                raise Exception('Daemon process is running, but no connectivity')
             raise Exception('%s failed to run.' % self.name)
 
     # restart the daemon
@@ -136,8 +157,9 @@ def register_socket(tag):
     lock_socket = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
     try:
         lock_socket.bind('\0%s' % tag)
+        return lock_socket
     except socket.error:
-        raise Exception('Error: process with tag %s is already running.' % tag)
+        raise socket.error('Error: process with tag %s is already running.' % tag)
 
 # runs command
 def run_command(command, timeout = 15, cwd = None):
-- 
cgit 1.2.3-korg