[gnome-applets] [invest-applet] handles exception when gconfd is not available, fixes bug #615662

[Enrico Minack <eminack src gnome org>]

commit 6121f5b9a6438bfde3e0da3a9920827d3a75344b
Author: Enrico Minack <enrico-minack gmx de>
Date:   Tue Jul 6 13:54:14 2010 +0200

    [invest-applet] handles exception when gconfd is not available, fixes bug #615662
    
    GConfd might not yet be available when Gnome starts. Until now, this caused
    the invest applet to crash. This fix makes the applet wait some seconds
    and retry, in case GConfd will be available soon.

 invest-applet/invest/__init__.py |   65 ++++++++++++++++++++++++++-----------
 1 files changed, 45 insertions(+), 20 deletions(-)
---
diff --git a/invest-applet/invest/__init__.py b/invest-applet/invest/__init__.py
index 63cc9dd..c642bbd 100644
--- a/invest-applet/invest/__init__.py
+++ b/invest-applet/invest/__init__.py
@@ -120,34 +120,59 @@ except Exception, msg:
 #	},
 #}
 
-client = gconf.client_get_default()
+# set default proxy config
+PROXY = None
 
 # borrowed from Ross Burton
 # http://burtonini.com/blog/computers/postr
+# extended by exception handling and retry scheduling
 def get_gnome_proxy(client):
-	if client.get_bool("/system/http_proxy/use_http_proxy"):
-		host = client.get_string("/system/http_proxy/host")
-		port = client.get_int("/system/http_proxy/port")
-		if host is None or host == "" or port == 0:
-			# gnome proxy is not valid, use enviroment if available
-			return None
-
-		if client.get_bool("/system/http_proxy/use_authentication"):
-			user = client.get_string("/system/http_proxy/authentication_user")
-			password = client.get_string("/system/http_proxy/authentication_password")
-			if user and user != "":
-				url = "http://%s:%s %s:%d" % (user, password, host, port)
+	sleep = 10	# sleep between attempts for 10 seconds
+	attempts = 3	# try to get configuration from gconf at most three times
+	get_gnome_proxy_retry(client, attempts, sleep)
+
+def get_gnome_proxy_retry(client, attempts, sleep):
+	# decrease attempts counter
+	attempts -= 1
+
+	# sanity check if we still need to look for proxy configuration
+	global PROXY
+	if PROXY != None:
+		return
+
+	# try to get config from gconfd
+	try:
+		if client.get_bool("/system/http_proxy/use_http_proxy"):
+			host = client.get_string("/system/http_proxy/host")
+			port = client.get_int("/system/http_proxy/port")
+			if host is None or host == "" or port == 0:
+				# gnome proxy is not valid, stop here
+				return
+
+			if client.get_bool("/system/http_proxy/use_authentication"):
+				user = client.get_string("/system/http_proxy/authentication_user")
+				password = client.get_string("/system/http_proxy/authentication_password")
+				if user and user != "":
+					url = "http://%s:%s %s:%d" % (user, password, host, port)
+				else:
+					url = "http://%s:%d"; % (host, port)
 			else:
 				url = "http://%s:%d"; % (host, port)
-		else:
-			url = "http://%s:%d"; % (host, port)
 
-		return {'http': url}
-	else:
-		# gnome proxy is not set, use enviroment if available
-		return None
+			# proxy config found, memorize
+			PROXY = {'http': url}
+
+	except Exception, msg:
+		error("Failed to get proxy configuration from GConfd:\n%s" % msg)
+		# we did not succeed, schedule retry
+		if attempts > 0:
+			error("Retrying to contact GConfd in %d seconds" % sleep)
+			gobject.timeout_add(sleep * 1000, get_gnome_proxy_retry, client, attempts, sleep)
+
+# use gconf to get proxy config
+client = gconf.client_get_default()
+get_gnome_proxy(client)
 
-PROXY = get_gnome_proxy(client)
 
 # connect to Network Manager to identify current network connectivity
 nm = networkmanager.NetworkManager()