Better logging of exceptions

Add workaround for Collectd which limits log size to 1023B.
Add stack trace to exception handling for better logs/debugging.

Closes-Bug #1570397

Change-Id: Ie9f1911e0fb367d5ce3637afd0909ab42a5efc61

collectd_ceilometer/logger.py

@@ -42,7 +42,10 @@ class CollectdLogHandler(logging.Handler):
 
             if self.cfg.VERBOSE and logging.DEBUG == record.levelno:
                 logger = collectd.info
-            logger(msg)
+
+            # collectd limits log size to 1023B, this is workaround
+            for i in range(0, len(msg), 1023):
+                logger(msg[i:i + 1023])
 
         except Exception as e:
             collectd.info("Exception in logger %s" % e)

collectd_ceilometer_plugin.py

@@ -63,7 +63,7 @@ class Plugin(object):
             self._writer.write(vl, data)
         except Exception as exc:
             if collectd is not None:
-                collectd.error('Exception during write: %s' % exc)
+                LOGGER.exception('Exception during write: %s', exc)
 
     def shutdown(self):
         """Shutdown callback"""
@@ -73,7 +73,7 @@ class Plugin(object):
             self._writer.flush()
         except Exception as exc:
             if collectd is not None:
-                collectd.error('Exception during shutdown: %s' % exc)
+                LOGGER.exception('Exception during shutdown: %s', exc)
 
 
 # The collectd plugin instance

devstack/libs/collectd

@@ -50,6 +50,9 @@ cat << EOF | sudo tee $COLLECTD_CONF_DIR/collectd-ceilometer-plugin.conf
 
     <Module collectd_ceilometer_plugin>
 
+        # Verbosity 1|0
+        #VERBOSE 0
+
         # Batch size
         BATCH_SIZE 3