statistics: Move stats handling to new "extras" module

Move the generation of statistics to its own module.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/extras/statistics.py

@@ -0,0 +1,29 @@
+# Support for logging periodic statistics
+#
+# Copyright (C) 2018  Kevin O'Connor <kevin@koconnor.net>
+#
+# This file may be distributed under the terms of the GNU GPLv3 license.
+import logging
+
+class PrinterStats:
+    def __init__(self, config):
+        self.printer = config.get_printer()
+        reactor = self.printer.get_reactor()
+        self.stats_timer = reactor.register_timer(self.generate_stats)
+        self.stats_cb = []
+    def printer_state(self, state):
+        if state == 'ready':
+            self.stats_cb = [o.stats for n, o in self.printer.lookup_objects()
+                             if hasattr(o, 'stats')]
+            if self.printer.get_start_args().get('debugoutput') is None:
+                reactor = self.printer.get_reactor()
+                reactor.update_timer(self.stats_timer, reactor.NOW)
+    def generate_stats(self, eventtime):
+        stats = [cb(eventtime) for cb in self.stats_cb]
+        if max([s[0] for s in stats]):
+            logging.info("Stats %.1f: %s", eventtime,
+                         ' '.join([s[1] for s in stats]))
+        return eventtime + 1.
+
+def load_config(config):
+    return PrinterStats(config)