From aa71d354b22f50c1f6d4d8fa9353c277fd2374ce Mon Sep 17 00:00:00 2001
From: Marco Pesenti Gritti <marco@localhost.localdomain>
Date: Mon, 25 Sep 2006 17:15:44 +0000
Subject: Merge branch 'master' of git+ssh://dev.laptop.org/git/sugar

---
diff --git a/services/presence/Buddy.py b/services/presence/Buddy.py
index 618902e..2c5d9b6 100644
--- a/services/presence/Buddy.py
+++ b/services/presence/Buddy.py
@@ -104,7 +104,7 @@ class Buddy(object):
 	"""Represents another person on the network and keeps track of the
 	activities and resources they make available for sharing."""
 
-	def __init__(self, bus_name, object_id, service):
+	def __init__(self, bus_name, object_id, service, icon_cache):
 		if not bus_name:
 			raise ValueError("DBus bus name must be valid")
 		if not object_id or type(object_id) != type(1):
@@ -137,6 +137,8 @@ class Buddy(object):
 		if service is not None:
 			self.add_service(service)
 
+		self._icon_cache = icon_cache
+
 	def object_path(self):
 		return dbus.ObjectPath(self._object_path)
 
@@ -148,25 +150,37 @@ class Buddy(object):
 		if result_status == network.RESULT_SUCCESS:
 			if icon and len(icon):
 				icon = base64.b64decode(icon)
-				logging.debug("Buddy icon for '%s' is size %d" % (self._nick_name, len(icon)))
 				self._set_icon(icon)
+				self._icon_cache.add_icon(icon)
 
 		if (result_status == network.RESULT_FAILED or not icon) and self._icon_tries < 3:
 			self._icon_tries = self._icon_tries + 1
 			logging.debug("Failed to retrieve buddy icon for '%s' on try %d of %d" % (self._nick_name, \
 					self._icon_tries, 3))
-			gobject.timeout_add(1000, self._request_buddy_icon, service)
+			gobject.timeout_add(1000, self._get_buddy_icon, service)
 		return False
 
-	def _request_buddy_icon(self, service):
-		"""Contact the buddy to retrieve the buddy icon."""
+	def _get_buddy_icon(self, service, retry=False):
+		"""Get the buddy's icon.  Check the cache first, if its
+		not there get the icon from the buddy over the network."""
+		if retry != True:
+			# Only hit the cache once
+			icon_hash = service.get_one_property('icon-hash')
+			if icon_hash is not None:
+				icon = self._icon_cache.get_icon(icon_hash)
+				if icon:
+					logging.debug("%s: icon cache hit for %s." % (self._nick_name, icon_hash))
+					self._set_icon(icon)
+					return False
+
+		logging.debug("%s: icon cache miss, adding icon to cache." % self._nick_name)
 		from sugar.p2p import Stream
 		buddy_stream = Stream.Stream.new_from_service(service, start_reader=False)
 		writer = buddy_stream.new_writer(service)
 		success = writer.custom_request("get_buddy_icon", self._request_buddy_icon_cb, service)
 		if not success:
 			del writer, buddy_stream
-			gobject.timeout_add(1000, self._request_buddy_icon, service)
+			gobject.timeout_add(1000, self._get_buddy_icon, service, True)
 		return False
 
 	def _get_service_key(self, service):
@@ -210,8 +224,7 @@ class Buddy(object):
 			# A buddy isn't valid until its official presence
 			# service has been found and resolved
 			self._valid = True
-			logging.debug('Requesting buddy icon %s' % self._nick_name)
-			self._request_buddy_icon(service)
+			self._get_buddy_icon(service)
 			self._color = service.get_one_property(_BUDDY_KEY_COLOR)
 			if self._color:
 				self._dbus_helper.PropertyChanged([_BUDDY_KEY_COLOR])
@@ -343,8 +356,8 @@ class Buddy(object):
 class Owner(Buddy):
 	"""Class representing the owner of the machine.  This is the client
 	portion of the Owner, paired with the server portion in Owner.py."""
-	def __init__(self, ps, bus_name, object_id):
-		Buddy.__init__(self, bus_name, object_id, None)
+	def __init__(self, ps, bus_name, object_id, icon_cache):
+		Buddy.__init__(self, bus_name, object_id, None, icon_cache)
 		self._nick_name = env.get_nick_name()
 		self._color = env.get_color()
 		self._ps = ps
diff --git a/services/presence/BuddyIconCache.py b/services/presence/BuddyIconCache.py
new file mode 100644
index 0000000..59d5e88
--- /dev/null
+++ b/services/presence/BuddyIconCache.py
@@ -0,0 +1,61 @@
+import os, time, md5
+from sugar import env
+from sugar import util
+
+class BuddyIconCache(object):
+	"""Caches icons on disk and finds them based on md5 hash."""
+	def __init__(self):
+		ppath = env.get_profile_path()
+		self._cachepath = os.path.join(ppath, "cache", "buddy-icons")
+		if not os.path.exists(self._cachepath):
+			os.makedirs(self._cachepath)
+
+		self._cache = {}
+
+		# Read all cached icons and their sums
+		for fname in os.listdir(self._cachepath):
+			m = md5.new()
+			data = self._get_icon_data(fname)
+			if len(data) == 0:
+				continue
+			m.update(data)
+			printable_hash = util.printable_hash(m.digest())
+			self._cache[printable_hash] = fname
+			del m
+
+	def _get_icon_data(self, fname):
+		fd = open(os.path.join(self._cachepath, fname), "r")
+		data = fd.read()
+		fd.close()
+		del fd
+		return data
+
+	def get_icon(self, printable_hash):
+		if type(printable_hash) != type(u""):
+			raise RuntimeError("printable_hash must be a unicode string.")
+		try:
+			fname = self._cache[printable_hash]
+			return self._get_icon_data(fname)
+		except KeyError:
+			pass
+		return None
+
+	def add_icon(self, icon_data):
+		if len(icon_data) == 0:
+			return
+
+		m = md5.new()
+		m.update(icon_data)
+		printable_hash = util.printable_hash(m.digest())
+		if self._cache.has_key(printable_hash):
+			del m
+			return
+
+		# Write the icon to disk and add an entry to our cache for it
+		m.update(time.asctime())
+		fname = util.printable_hash(m.digest())
+		fd = open(os.path.join(self._cachepath, fname), "w")
+		fd.write(icon_data)
+		fd.close()
+		self._cache[printable_hash] = fname
+		del m
diff --git a/services/presence/Makefile.am b/services/presence/Makefile.am
index c095cb6..f64bc02 100644
--- a/services/presence/Makefile.am
+++ b/services/presence/Makefile.am
@@ -6,11 +6,12 @@ $(service_DATA): $(service_in_files) Makefile
 	@sed -e "s|\@bindir\@|$(bindir)|" $< > $@
 
 sugardir = $(pkgdatadir)/services/presence
-sugar_PYTHON =				\
+sugar_PYTHON =			\
 	__init__.py			\
 	Activity.py			\
 	Buddy.py			\
-	PresenceService.py		\
+	BuddyIconCache.py	\
+	PresenceService.py	\
 	Service.py
 
 bin_SCRIPTS = sugar-presence-service
diff --git a/services/presence/PresenceService.py b/services/presence/PresenceService.py
index 73c2efa..77c67ee 100644
--- a/services/presence/PresenceService.py
+++ b/services/presence/PresenceService.py
@@ -5,6 +5,7 @@ import Activity
 import random
 import logging
 from sugar import util
+import BuddyIconCache
 
 
 _SA_UNRESOLVED = 0
@@ -302,9 +303,11 @@ class PresenceService(object):
 		self._bus_name = dbus.service.BusName(_PRESENCE_SERVICE, bus=self._session_bus)		
 		self._dbus_helper = PresenceServiceDBusHelper(self, self._bus_name)
 
+		self._icon_cache = BuddyIconCache.BuddyIconCache()
+
 		# Our owner object
 		objid = self._get_next_object_id()
-		self._owner = Buddy.Owner(self, self._bus_name, objid)
+		self._owner = Buddy.Owner(self, self._bus_name, objid, self._icon_cache)
 		self._buddies[self._owner.get_name()] = self._owner
 
 		self._started = False
@@ -423,7 +426,7 @@ class PresenceService(object):
 		except KeyError:
 			source_addr = service.get_source_address()
 			objid = self._get_next_object_id()
-			buddy = Buddy.Buddy(self._bus_name, objid, service)
+			buddy = Buddy.Buddy(self._bus_name, objid, service, self._icon_cache)
 			self._buddies[name] = buddy
 			self._dbus_helper.ServiceAppeared(service.object_path())
 		if not buddy_was_valid and buddy.is_valid():
diff --git a/shell/model/Owner.py b/shell/model/Owner.py
index 097d9c2..3bf3a55 100644
--- a/shell/model/Owner.py
+++ b/shell/model/Owner.py
@@ -8,6 +8,7 @@ from sugar import env
 import logging
 from sugar.p2p import Stream
 from sugar.presence import PresenceService
+from sugar import util
 from model.Invites import Invites
 import dbus
 
@@ -24,11 +25,17 @@ class ShellOwner(object):
 		user_dir = profile.get_path()
 
 		self._icon = None
+		self._icon_hash = ""
 		for fname in os.listdir(user_dir):
 			if not fname.startswith("buddy-icon."):
 				continue
 			fd = open(os.path.join(user_dir, fname), "r")
 			self._icon = fd.read()
+			if self._icon:
+				# Get the icon's hash
+				import md5, binascii
+				digest = md5.new(self._icon).digest()
+				self._icon_hash = util.printable_hash(digest)
 			fd.close()
 			break
 
@@ -49,7 +56,7 @@ class ShellOwner(object):
 	def announce(self):
 		# Create and announce our presence
 		color = conf.get_profile().get_color()
-		props = {'color':color.to_string()}
+		props = {'color': color.to_string(), 'icon-hash': self._icon_hash}
 		self._service = self._pservice.register_service(self._nick,
 				PRESENCE_SERVICE_TYPE, properties=props)
 		logging.debug("Owner '%s' using port %d" % (self._nick, self._service.get_port()))
--
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