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https://github.com/scylladb/scylladb.git
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26c0d86401
NOTE: scyllatop now requires the urwid library previously, if there were more metrics that lines in the terminal window, the user could not see some of the metrics. Now the user can scroll. As an added bonus, the program will not crash when the window size changes. Signed-off-by: Yoav Kleinberger <yoav@scylladb.com> Message-Id: <1464098832-5755-1-git-send-email-yoav@scylladb.com>
65 lines
2.0 KiB
Python
65 lines
2.0 KiB
Python
import logging
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import parseexception
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import fnmatch
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import time
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import metric
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import defaults
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class LiveData(object):
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def __init__(self, metricPatterns, interval, collectd):
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logging.info('will query collectd every {0} seconds'.format(interval))
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self._startedAt = time.time()
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self._measurements = []
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self._interval = interval
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self._collectd = collectd
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self._initializeMetrics(metricPatterns)
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self._views = []
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self._stop = False
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def addView(self, view):
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self._views.append(view)
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@property
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def measurements(self):
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return self._measurements
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def _initializeMetrics(self, metricPatterns):
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if len(metricPatterns) > 0:
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self._setupUserSpecifiedMetrics(metricPatterns)
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else:
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self._setupUserSpecifiedMetrics(defaults.DEFAULT_METRIC_PATTERNS)
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def _setupUserSpecifiedMetrics(self, metricPatterns):
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availableSymbols = [m.symbol for m in metric.Metric.discover(self._collectd)]
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symbols = [symbol for symbol in availableSymbols if self._matches(symbol, metricPatterns)]
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for symbol in symbols:
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logging.info('adding {0}'.format(symbol))
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self._measurements.append(metric.Metric(symbol, self._collectd))
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def _matches(self, symbol, metricPatterns):
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for pattern in metricPatterns:
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match = fnmatch.fnmatch(symbol, pattern)
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if match:
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return True
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return False
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def go(self, mainLoop):
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while not self._stop:
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for metric in self._measurements:
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self._update(metric)
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for view in self._views:
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view.update(self)
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time.sleep(self._interval)
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mainLoop.draw_screen()
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def _update(self, metric):
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try:
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metric.update()
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except parseexception.ParseException:
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logging.exception('exception while updating metric {0}'.format(metric))
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def stop(self):
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self._stop = True
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