From a78cca8863b3c84569ba2776433ffdee471ff2ef Mon Sep 17 00:00:00 2001
From: David Lamparter <equinox@diac24.net>
Date: Mon, 10 Oct 2016 23:32:26 +0000
Subject: envmon: simplify after onewire problem is fixed

onewire had a kernel bug in managing bus power...
---
 envmon/onewire-sysfs.py    | 21 ++++-----------------
 envmon/onewire2graphite.py | 32 ++++++++++++++++----------------
 2 files changed, 20 insertions(+), 33 deletions(-)

diff --git a/envmon/onewire-sysfs.py b/envmon/onewire-sysfs.py
index d889768..f42afee 100644
--- a/envmon/onewire-sysfs.py
+++ b/envmon/onewire-sysfs.py
@@ -32,8 +32,6 @@ class SensorFacade(object):
 	def __init__(self, addr, name):
 		self._addr = addr
 		self._name = name
-		self._cached = None
-		self._cachets = None
 		self._backoff = None
 
 	def _path(self):
@@ -62,33 +60,22 @@ class SensorFacade(object):
 
 	@property
 	def temperature(self):
-		if self._cachets > time.time() - 50:
-			return self._cached
 		if self._backoff > time.time():
-			if self._cachets > time.time() - 250:
-				return self._cached
 			return None
 
 		try:
 			rv = self.get_temperature()
 			if rv > 65 or rv < -25:
 				raise OutOfRange, (self._path(), rv)
-			self._cached = rv
-			self._cachets = time.time()
-			self._backoff = None
-			print '\033[32m', self._name, 'read', self._cached, '\033[m'
-			return self._cached
+			# print '\033[32m', self._name, 'read', rv, '\033[m'
+			return rv
 		except SensorNotPresent:
 			self._backoff = time.time() + 2 + random.expovariate(1./3.) * 2
-			print '\033[31m', self._name, 'SensorNotPresent back-off', self._backoff - time.time(), '\033[m'
-			if self._cachets > time.time() - 250:
-				return self._cached
+			# print '\033[31m', self._name, 'SensorNotPresent back-off', self._backoff - time.time(), '\033[m'
 			raise
 		except OutOfRange:
 			self._backoff = time.time() + 15 + random.expovariate(1./4.) * 10
-			print '\033[33m', self._name, 'OutOfRange back-off', self._backoff - time.time(), '\033[m'
-			if self._cachets > time.time() - 250:
-				return self._cached
+			# print '\033[33m', self._name, 'OutOfRange back-off', self._backoff - time.time(), '\033[m'
 			raise
 
 def sensor(name):
diff --git a/envmon/onewire2graphite.py b/envmon/onewire2graphite.py
index 4b7743e..81c6b50 100755
--- a/envmon/onewire2graphite.py
+++ b/envmon/onewire2graphite.py
@@ -22,22 +22,22 @@ while True:
     nextslot = time.time() + 65
     nextslot = nextslot - (nextslot % 60)
 
-    while nextslot - time.time() > 5.0:
-        for sensor in sensors:
-            try:
-                vals.setdefault(sensor, None)
-                vals[sensor] = sensobj[sensor].temperature
-            except onewire.SensorNotPresent, e:
-                print >>sys.stderr, sensor, 'SensorNotPresent:', str(e)
-            except onewire.OutOfRange, e:
-                # print >>sys.stderr, sensor, 'OutOfRange:', str(e)
-                pass
-            except Exception:
-                print >>sys.stderr, "On %s: Could not retrieve temperature for '%s':" % (
-                    time.strftime('%a, %d %b %Y %T %z'), sensor)
-                sys.excepthook(*sys.exc_info())
-                print >>sys.stderr, '========================================'
-        time.sleep(0.5)
+    time.sleep(max(nextslot - len(sensors) * 0.8 - time.time(), 0))
+
+    for sensor in sensors:
+        try:
+            vals.setdefault(sensor, None)
+            vals[sensor] = sensobj[sensor].temperature
+        except onewire.SensorNotPresent, e:
+            print >>sys.stderr, sensor, 'SensorNotPresent:', str(e)
+        except onewire.OutOfRange, e:
+            # print >>sys.stderr, sensor, 'OutOfRange:', str(e)
+            pass
+        except Exception:
+            print >>sys.stderr, "On %s: Could not retrieve temperature for '%s':" % (
+                time.strftime('%a, %d %b %Y %T %z'), sensor)
+            sys.excepthook(*sys.exc_info())
+            print >>sys.stderr, '========================================'
 
     time.sleep(max(nextslot - time.time(), 0))
     goodvals = [sensor for sensor in sensors if vals.get(sensor, None) is not None]
-- 
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