From b8b6e14e6923809efc61c71dd94b1e66026aad9b Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Fri, 1 Nov 2013 12:22:30 +0100
Subject: [PATCH] update the SpaceAPI at least once every 10 minutes (so the
 server could check for this heartbeat)

---
 spaceapi.py | 45 +++++++++++++++++++--------------------------
 1 file changed, 19 insertions(+), 26 deletions(-)

diff --git a/spaceapi.py b/spaceapi.py
index dd722b9..eea73f6 100644
--- a/spaceapi.py
+++ b/spaceapi.py
@@ -1,17 +1,20 @@
 from threading import Lock
 from libtuer import ThreadFunction, logger
-import urllib.request
+import urllib.request, time
 
 from config import spaceApiKey
 
+RETRY_TIME = 30
+HEARTBEAT_TIME = 10*60
+
 class SpaceApi:
 	def __init__ (self, waker):
-		self._state_to_set = None
-		self._state_last_set = None
+		self._local_state = None
+		self._remote_state = None
+		self._last_set_at = 0
 		self._running = True
 		self.set_state = ThreadFunction(self._set_state, "Space API")
-		self._set_state_lock = Lock()
-		waker.register(self.set_state, 10.0) # re-try setting the state every 10 seconds
+		waker.register(self.set_state, RETRY_TIME)
 	
 	def stop (self):
 		self.set_state.stop()
@@ -34,24 +37,14 @@ class SpaceApi:
 	def _set_state (self, state = None):
 		'''Sets the state, if None: leave state unchanged and re-try if previous attempts failed'''
 		if state is not None:
-			self._state_to_set = state
-		else:
-			# always have a local variable because of parallelism
-			state = self._state_to_set
-		
-		if not self._set_state_lock.acquire(False):
-			# we don't want many threads to wait here
-			# the next status update will fix everything anyways
-			pass
-		else:
-			# got the lock
-			try:
-				# check if there's something we need to do
-				if self._state_last_set == state: return
-				# take action!
-				success = self._do_request(state)
-				# TODO error too often -> log critical to send mails
-				if success:
-					self._state_last_set = state
-			finally:
-				self._set_state_lock.release()
+			self._local_state = state
+		# check if there's something we need to do: There's a valid state, and either the state has changed or
+		# we need to refresh our heartbeta)
+		now = time.time()
+		if self._local_state is not None and (self._local_state != self._remote_state or now > self._last_set_at+HEARTBEAT_TIME):
+			# take action!
+			success = self._do_request(self._local_state)
+			# TODO error too often -> log critical to send mails
+			if success:
+				self._remote_state = self._local_state
+				self._last_set_at = now
-- 
2.30.2