Added MetricLogster parser

Author: jblaine

parsers/MetricLogster.py

@@ -0,0 +1,53 @@
+import time
+import re
+
+from logster_helper import MetricObject, LogsterParser
+from logster_helper import LogsterParsingException
+
+# For help with what this is all about, see one of the sample
+# Logster parsers which have more detailed comments about
+# the structure of the class and each method's function.
+
+# Collect arbitrary metric lines and spit out aggregated
+# metric values (MetricObjects) based on the metric names
+# found in the lines. Any conforming metric, one parser. Sweet.
+
+class MetricLogster(LogsterParser):
+
+    def __init__(self, option_string=None):
+        self.metrics = {}
+        # Examples:
+        #
+        # Mar 30 20:35:03 mail1 whatever[1323]: metric=mail1.my.metric value=9
+        # Mar 31 03:44:28 fs9 blah[9403]: metric=foo.bar value=4484884
+        #
+        self.reg = re.compile('.+ metric=(?P<metricname>[-_a-zA-Z0-9.]+) value=(?P<value>[0-9.]+))')
+
+    def parse_line(self, line):
+        try:
+            regMatch = self.reg.match(line)
+
+            if regMatch:
+                linebits = regMatch.groupdict()
+                metric = str(linebits['metricname'])
+                value = int(linebits['value'])
+                if self.metrics.has_key(metric):
+                    self.metrics[metric] = self.metrics[metric] + int(value)
+                else:
+                    self.metrics[metric] = int(value)
+            else:
+                raise LogsterParsingException, "regmatch failed to match"
+
+        except Exception, e:
+            raise LogsterParsingException, "regmatch or contents failed with %s" % e
+
+
+    def get_state(self, duration):
+        self.duration = duration
+
+        outlines = []
+
+        for k in self.metrics.keys():
+            outlines.append(MetricObject(k, (self.metrics[k] / self.duration), "per sec"))
+
+        return outlines