Better foreground logging (printing).

When run in the foreground, you'll see printed messages.  For non-errors
receiving metrics, you'll still see one line printed per metric received,
but it will include the metric value parts as well.

If there's an error on metric receipt, you'll see that as well (without having
to enable "debug" in the config file.  This is in the spirit of seeing some
output printed regardless of the "debug" value in the config.  Plus, this way
you won't miss StatsD packet decoding errors (which should be rare) if you
ran the daemon with "-f" but didn't have debugging enabled.

statsdpy/statsd.py

@@ -14,7 +14,6 @@
 
 
 class StatsdServer(object):
-
     def __init__(self, conf):
         TRUE_VALUES = set(('true', '1', 'yes', 'on', 't', 'y'))
         self.logger = logging.getLogger('statsdpy')
@@ -44,6 +43,11 @@ def __init__(self, conf):
         self.timers = {}
         self.gauges = {}
         self.stats_seen = 0
+        self.processors = {
+            'g': self.process_gauge,
+            'c': self.process_counter,
+            'ms': self.process_timer,
+        }
 
     def _get_batches(self, items):
         """given a list yield list at most self.max_batch_size in size"""
@@ -266,26 +270,20 @@ def decode_recvd(self, data):
         bits = data.split(':')
         if len(bits) == 2:
             key = self.keycheck.sub('_', bits[0])
-            print "got key: %s" % key
             fields = bits[1].split("|")
             field_count = len(fields)
             if field_count >= 2:
-                if fields[1] == "ms":
-                    self.process_timer(key, fields)
-                elif fields[1] == "c":
-                    self.process_counter(key, fields)
-                elif fields[1] == "g":
-                    self.process_gauge(key, fields)
+                processor = self.processors.get(fields[1])
+                if processor:
+                    print "got key: %s %r" % (key, fields)
+                    processor(key, fields)
                 else:
-                    if self.debug:
-                        print "error: unsupported stats type"
-                        print "key -> %s\nfields ->%s" % (key, fields)
+                    print "error: unsupported stats type"
+                    print "key -> %s\nfields ->%s" % (key, fields)
             else:
-                if self.debug:
-                    print "error: not enough fields received"
+                print "error (%s): not enough fields received" % key
         else:
-            if self.debug:
-                print "error: invalid request"
+            print "error (%s): invalid request" % key
 
     def run(self):
         eventlet.spawn_n(self.stats_flush)
@@ -337,7 +335,10 @@ def run_server():
         print "Running in foreground."
         conf = readconf(options.conf)
         statsd = StatsdServer(conf['main'])
-        statsd.run()
+        try:
+            statsd.run()
+        except KeyboardInterrupt:
+            print ''  # in testing, you'll see "^C<prompt>" w/o this
         sys.exit(0)
 
     if len(sys.argv) >= 2: