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1 | #!/usr/bin/python | |
2 | ############################################################################### | |
3 | # # | |
4 | # collecty - A system statistics collection daemon for IPFire # | |
5 | # Copyright (C) 2012 IPFire development team # | |
6 | # # | |
7 | # This program is free software: you can redistribute it and/or modify # | |
8 | # it under the terms of the GNU General Public License as published by # | |
9 | # the Free Software Foundation, either version 3 of the License, or # | |
10 | # (at your option) any later version. # | |
11 | # # | |
12 | # This program is distributed in the hope that it will be useful, # | |
13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of # | |
14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # | |
15 | # GNU General Public License for more details. # | |
16 | # # | |
17 | # You should have received a copy of the GNU General Public License # | |
18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. # | |
19 | # # | |
20 | ############################################################################### | |
21 | ||
22 | from __future__ import division | |
23 | ||
24 | import datetime | |
25 | import logging | |
26 | import math | |
27 | import os | |
28 | import rrdtool | |
29 | import tempfile | |
30 | import threading | |
31 | import time | |
32 | ||
33 | from ..constants import * | |
34 | from ..i18n import _ | |
35 | ||
36 | _plugins = {} | |
37 | ||
38 | def get(): | |
39 | """ | |
40 | Returns a list with all automatically registered plugins. | |
41 | """ | |
42 | return _plugins.values() | |
43 | ||
44 | class Timer(object): | |
45 | def __init__(self, timeout, heartbeat=1): | |
46 | self.timeout = timeout | |
47 | self.heartbeat = heartbeat | |
48 | ||
49 | self.delay = 0 | |
50 | ||
51 | self.reset() | |
52 | ||
53 | def reset(self, delay=0): | |
54 | # Save start time. | |
55 | self.start = time.time() | |
56 | ||
57 | self.delay = delay | |
58 | ||
59 | # Has this timer been killed? | |
60 | self.killed = False | |
61 | ||
62 | @property | |
63 | def elapsed(self): | |
64 | return time.time() - self.start - self.delay | |
65 | ||
66 | def cancel(self): | |
67 | self.killed = True | |
68 | ||
69 | def wait(self): | |
70 | while self.elapsed < self.timeout and not self.killed: | |
71 | time.sleep(self.heartbeat) | |
72 | ||
73 | return self.elapsed > self.timeout | |
74 | ||
75 | ||
76 | class Plugin(threading.Thread): | |
77 | # The name of this plugin. | |
78 | name = None | |
79 | ||
80 | # A description for this plugin. | |
81 | description = None | |
82 | ||
83 | # Templates which can be used to generate a graph out of | |
84 | # the data from this data source. | |
85 | templates = [] | |
86 | ||
87 | # The default interval for all plugins | |
88 | interval = 60 | |
89 | ||
90 | # Automatically register all providers. | |
91 | class __metaclass__(type): | |
92 | def __init__(plugin, name, bases, dict): | |
93 | type.__init__(plugin, name, bases, dict) | |
94 | ||
95 | # The main class from which is inherited is not registered | |
96 | # as a plugin. | |
97 | if name == "Plugin": | |
98 | return | |
99 | ||
100 | if not all((plugin.name, plugin.description)): | |
101 | raise RuntimeError(_("Plugin is not properly configured: %s") \ | |
102 | % plugin) | |
103 | ||
104 | _plugins[plugin.name] = plugin | |
105 | ||
106 | def __init__(self, collecty, **kwargs): | |
107 | threading.Thread.__init__(self, name=self.description) | |
108 | self.daemon = True | |
109 | ||
110 | self.collecty = collecty | |
111 | ||
112 | # Check if this plugin was configured correctly. | |
113 | assert self.name, "Name of the plugin is not set: %s" % self.name | |
114 | assert self.description, "Description of the plugin is not set: %s" % self.description | |
115 | ||
116 | # Initialize the logger. | |
117 | self.log = logging.getLogger("collecty.plugins.%s" % self.name) | |
118 | self.log.propagate = 1 | |
119 | ||
120 | self.data = [] | |
121 | ||
122 | # Run some custom initialization. | |
123 | self.init(**kwargs) | |
124 | ||
125 | # Keepalive options | |
126 | self.running = True | |
127 | self.timer = Timer(self.interval) | |
128 | ||
129 | self.log.debug(_("Successfully initialized %s") % self.__class__.__name__) | |
130 | ||
131 | @property | |
132 | def path(self): | |
133 | """ | |
134 | Returns the name of the sub directory in which all RRD files | |
135 | for this plugin should be stored in. | |
136 | """ | |
137 | return self.name | |
138 | ||
139 | ### Basic methods | |
140 | ||
141 | def init(self, **kwargs): | |
142 | """ | |
143 | Do some custom initialization stuff here. | |
144 | """ | |
145 | pass | |
146 | ||
147 | def collect(self): | |
148 | """ | |
149 | Gathers the statistical data, this plugin collects. | |
150 | """ | |
151 | time_start = time.time() | |
152 | ||
153 | # Run through all objects of this plugin and call the collect method. | |
154 | for o in self.objects: | |
155 | now = datetime.datetime.utcnow() | |
156 | try: | |
157 | result = o.collect() | |
158 | except: | |
159 | self.log.warning(_("Unhandled exception in %s.collect()") % o, exc_info=True) | |
160 | continue | |
161 | ||
162 | if not result: | |
163 | self.log.warning(_("Received empty result: %s") % o) | |
164 | continue | |
165 | ||
166 | self.log.debug(_("Collected %s: %s") % (o, result)) | |
167 | ||
168 | # Add the object to the write queue so that the data is written | |
169 | # to the databases later. | |
170 | self.collecty.write_queue.add(o, now, result) | |
171 | ||
172 | # Returns the time this function took to complete. | |
173 | return (time.time() - time_start) | |
174 | ||
175 | def run(self): | |
176 | self.log.debug(_("%s plugin has started") % self.name) | |
177 | ||
178 | # Initially collect everything | |
179 | self.collect() | |
180 | ||
181 | while self.running: | |
182 | # Reset the timer. | |
183 | self.timer.reset() | |
184 | ||
185 | # Wait until the timer has successfully elapsed. | |
186 | if self.timer.wait(): | |
187 | delay = self.collect() | |
188 | self.timer.reset(delay) | |
189 | ||
190 | self.log.debug(_("%s plugin has stopped") % self.name) | |
191 | ||
192 | def shutdown(self): | |
193 | self.log.debug(_("Received shutdown signal.")) | |
194 | self.running = False | |
195 | ||
196 | # Kill any running timers. | |
197 | if self.timer: | |
198 | self.timer.cancel() | |
199 | ||
200 | def get_object(self, id): | |
201 | for object in self.objects: | |
202 | if not object.id == id: | |
203 | continue | |
204 | ||
205 | return object | |
206 | ||
207 | def get_template(self, template_name): | |
208 | for template in self.templates: | |
209 | if not template.name == template_name: | |
210 | continue | |
211 | ||
212 | return template(self) | |
213 | ||
214 | def generate_graph(self, template_name, object_id="default", **kwargs): | |
215 | template = self.get_template(template_name) | |
216 | if not template: | |
217 | raise RuntimeError("Could not find template %s" % template_name) | |
218 | ||
219 | time_start = time.time() | |
220 | ||
221 | graph = template.generate_graph(object_id=object_id, **kwargs) | |
222 | ||
223 | duration = time.time() - time_start | |
224 | self.log.debug(_("Generated graph %s in %.1fms") \ | |
225 | % (template, duration * 1000)) | |
226 | ||
227 | return graph | |
228 | ||
229 | ||
230 | class Object(object): | |
231 | # The schema of the RRD database. | |
232 | rrd_schema = None | |
233 | ||
234 | # RRA properties. | |
235 | rra_types = ["AVERAGE", "MIN", "MAX"] | |
236 | rra_timespans = [3600, 86400, 604800, 2678400, 31622400] | |
237 | rra_rows = 2880 | |
238 | ||
239 | def __init__(self, plugin, *args, **kwargs): | |
240 | self.plugin = plugin | |
241 | ||
242 | # Indicates if this object has collected its data | |
243 | self.collected = False | |
244 | ||
245 | # Initialise this object | |
246 | self.init(*args, **kwargs) | |
247 | ||
248 | # Create the database file. | |
249 | self.create() | |
250 | ||
251 | def __repr__(self): | |
252 | return "<%s>" % self.__class__.__name__ | |
253 | ||
254 | @property | |
255 | def collecty(self): | |
256 | return self.plugin.collecty | |
257 | ||
258 | @property | |
259 | def log(self): | |
260 | return self.plugin.log | |
261 | ||
262 | @property | |
263 | def id(self): | |
264 | """ | |
265 | Returns a UNIQUE identifier for this object. As this is incorporated | |
266 | into the path of RRD file, it must only contain ASCII characters. | |
267 | """ | |
268 | raise NotImplementedError | |
269 | ||
270 | @property | |
271 | def file(self): | |
272 | """ | |
273 | The absolute path to the RRD file of this plugin. | |
274 | """ | |
275 | return os.path.join(DATABASE_DIR, self.plugin.path, "%s.rrd" % self.id) | |
276 | ||
277 | ### Basic methods | |
278 | ||
279 | def init(self, *args, **kwargs): | |
280 | """ | |
281 | Do some custom initialization stuff here. | |
282 | """ | |
283 | pass | |
284 | ||
285 | def create(self): | |
286 | """ | |
287 | Creates an empty RRD file with the desired data structures. | |
288 | """ | |
289 | # Skip if the file does already exist. | |
290 | if os.path.exists(self.file): | |
291 | return | |
292 | ||
293 | dirname = os.path.dirname(self.file) | |
294 | if not os.path.exists(dirname): | |
295 | os.makedirs(dirname) | |
296 | ||
297 | # Create argument list. | |
298 | args = self.get_rrd_schema() | |
299 | ||
300 | rrdtool.create(self.file, *args) | |
301 | ||
302 | self.log.debug(_("Created RRD file %s.") % self.file) | |
303 | for arg in args: | |
304 | self.log.debug(" %s" % arg) | |
305 | ||
306 | def info(self): | |
307 | return rrdtool.info(self.file) | |
308 | ||
309 | @property | |
310 | def stepsize(self): | |
311 | return self.plugin.interval | |
312 | ||
313 | @property | |
314 | def heartbeat(self): | |
315 | return self.stepsize * 2 | |
316 | ||
317 | def get_rrd_schema(self): | |
318 | schema = [ | |
319 | "--step", "%s" % self.stepsize, | |
320 | ] | |
321 | for line in self.rrd_schema: | |
322 | if line.startswith("DS:"): | |
323 | try: | |
324 | (prefix, name, type, lower_limit, upper_limit) = line.split(":") | |
325 | ||
326 | line = ":".join(( | |
327 | prefix, | |
328 | name, | |
329 | type, | |
330 | "%s" % self.heartbeat, | |
331 | lower_limit, | |
332 | upper_limit | |
333 | )) | |
334 | except ValueError: | |
335 | pass | |
336 | ||
337 | schema.append(line) | |
338 | ||
339 | xff = 0.1 | |
340 | ||
341 | cdp_length = 0 | |
342 | for rra_timespan in self.rra_timespans: | |
343 | if (rra_timespan / self.stepsize) < self.rra_rows: | |
344 | rra_timespan = self.stepsize * self.rra_rows | |
345 | ||
346 | if cdp_length == 0: | |
347 | cdp_length = 1 | |
348 | else: | |
349 | cdp_length = rra_timespan // (self.rra_rows * self.stepsize) | |
350 | ||
351 | cdp_number = math.ceil(rra_timespan / (cdp_length * self.stepsize)) | |
352 | ||
353 | for rra_type in self.rra_types: | |
354 | schema.append("RRA:%s:%.10f:%d:%d" % \ | |
355 | (rra_type, xff, cdp_length, cdp_number)) | |
356 | ||
357 | return schema | |
358 | ||
359 | def execute(self): | |
360 | if self.collected: | |
361 | raise RuntimeError("This object has already collected its data") | |
362 | ||
363 | self.collected = True | |
364 | self.now = datetime.datetime.utcnow() | |
365 | ||
366 | # Call the collect | |
367 | result = self.collect() | |
368 | ||
369 | def commit(self): | |
370 | """ | |
371 | Will commit the collected data to the database. | |
372 | """ | |
373 | # Make sure that the RRD database has been created | |
374 | self.create() | |
375 | ||
376 | ||
377 | class GraphTemplate(object): | |
378 | # A unique name to identify this graph template. | |
379 | name = None | |
380 | ||
381 | # Headline of the graph image | |
382 | graph_title = None | |
383 | ||
384 | # Vertical label of the graph | |
385 | graph_vertical_label = None | |
386 | ||
387 | # Limits | |
388 | lower_limit = None | |
389 | upper_limit = None | |
390 | ||
391 | # Instructions how to create the graph. | |
392 | rrd_graph = None | |
393 | ||
394 | # Extra arguments passed to rrdgraph. | |
395 | rrd_graph_args = [] | |
396 | ||
397 | intervals = { | |
398 | None : "-3h", | |
399 | "hour" : "-1h", | |
400 | "day" : "-25h", | |
401 | "week" : "-360h", | |
402 | "year" : "-365d", | |
403 | } | |
404 | ||
405 | # Default dimensions for this graph | |
406 | height = GRAPH_DEFAULT_HEIGHT | |
407 | width = GRAPH_DEFAULT_WIDTH | |
408 | ||
409 | def __init__(self, plugin): | |
410 | self.plugin = plugin | |
411 | ||
412 | def __repr__(self): | |
413 | return "<%s>" % self.__class__.__name__ | |
414 | ||
415 | @property | |
416 | def collecty(self): | |
417 | return self.plugin.collecty | |
418 | ||
419 | @property | |
420 | def log(self): | |
421 | return self.plugin.log | |
422 | ||
423 | def _make_command_line(self, interval, format=DEFAULT_IMAGE_FORMAT, | |
424 | width=None, height=None): | |
425 | args = [] | |
426 | ||
427 | args += GRAPH_DEFAULT_ARGUMENTS | |
428 | ||
429 | args += [ | |
430 | "--imgformat", format, | |
431 | "--height", "%s" % (height or self.height), | |
432 | "--width", "%s" % (width or self.width), | |
433 | ] | |
434 | ||
435 | args += self.rrd_graph_args | |
436 | ||
437 | # Graph title | |
438 | if self.graph_title: | |
439 | args += ["--title", self.graph_title] | |
440 | ||
441 | # Vertical label | |
442 | if self.graph_vertical_label: | |
443 | args += ["--vertical-label", self.graph_vertical_label] | |
444 | ||
445 | if self.lower_limit is not None or self.upper_limit is not None: | |
446 | # Force to honour the set limits | |
447 | args.append("--rigid") | |
448 | ||
449 | if self.lower_limit is not None: | |
450 | args += ["--lower-limit", self.lower_limit] | |
451 | ||
452 | if self.upper_limit is not None: | |
453 | args += ["--upper-limit", self.upper_limit] | |
454 | ||
455 | # Add interval | |
456 | args.append("--start") | |
457 | ||
458 | try: | |
459 | args.append(self.intervals[interval]) | |
460 | except KeyError: | |
461 | args.append(str(interval)) | |
462 | ||
463 | return args | |
464 | ||
465 | def get_object_table(self, object_id): | |
466 | return { | |
467 | "file" : self.plugin.get_object(object_id), | |
468 | } | |
469 | ||
470 | def get_object_files(self, object_id): | |
471 | files = {} | |
472 | ||
473 | for id, obj in self.get_object_table(object_id).items(): | |
474 | files[id] = obj.file | |
475 | ||
476 | return files | |
477 | ||
478 | def generate_graph(self, object_id, interval=None, **kwargs): | |
479 | args = self._make_command_line(interval, **kwargs) | |
480 | ||
481 | self.log.info(_("Generating graph %s") % self) | |
482 | self.log.debug(" args: %s" % args) | |
483 | ||
484 | object_files = self.get_object_files(object_id) | |
485 | ||
486 | for item in self.rrd_graph: | |
487 | try: | |
488 | args.append(item % object_files) | |
489 | except TypeError: | |
490 | args.append(item) | |
491 | ||
492 | return self.write_graph(*args) | |
493 | ||
494 | def write_graph(self, *args): | |
495 | # Convert all arguments to string | |
496 | args = [str(e) for e in args] | |
497 | ||
498 | with tempfile.NamedTemporaryFile() as f: | |
499 | rrdtool.graph(f.name, *args) | |
500 | ||
501 | # Get back to the beginning of the file | |
502 | f.seek(0) | |
503 | ||
504 | # Return all the content | |
505 | return f.read() |