Mercurial > feed-push
annotate feed-push @ 32:5348758c622d draft
don't keep file descriptors open
Signed-off-by: Changaco <changaco ατ changaco δοτ net>
| author | Changaco <changaco ατ changaco δοτ net> |
|---|---|
| date | Sun, 05 Aug 2012 14:47:19 +0200 |
| parents | f5c5e6f4edc8 |
| children | adde3e451237 |
| rev | line source |
|---|---|
| 1 | 1 #!/usr/bin/env python2 |
| 2 # -*- coding: utf-8 -*- | |
| 3 | |
| 4 # This program is free software: you can redistribute it and/or modify | |
| 5 # it under the terms of the GNU General Public License as published by | |
| 6 # the Free Software Foundation, either version 3 of the License, or | |
| 7 # (at your option) any later version. | |
| 8 # | |
| 9 # This program is distributed in the hope that it will be useful, | |
| 10 # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 # GNU General Public License for more details. | |
| 13 # | |
| 14 # You should have received a copy of the GNU General Public License | |
| 15 # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 16 | |
| 17 import argparse | |
| 18 import calendar | |
| 19 from functools import partial, reduce | |
| 20 from glob import glob | |
| 21 import json | |
| 22 import os | |
| 7 | 23 from os.path import abspath, dirname, isdir |
| 1 | 24 import shlex |
| 25 from subprocess import Popen, PIPE, STDOUT | |
| 26 import sys | |
| 27 from syslog import * | |
| 28 import time | |
|
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29 import traceback |
| 1 | 30 |
| 31 import feedparser | |
| 32 | |
| 33 | |
| 34 # Constants | |
| 35 | |
| 36 log_levels = ['DEBUG', 'INFO', 'NOTICE', 'WARNING', 'ERR', 'CRIT', 'ALERT', 'EMERG'] | |
| 37 | |
| 38 gamin_events = { | |
| 39 1:'GAMChanged', 2:'GAMDeleted', 3:'GAMStartExecuting', 4:'GAMStopExecuting', | |
| 40 5:'GAMCreated', 6:'GAMMoved', 7:'GAMAcknowledge', 8:'GAMExists', 9:'GAMEndExist' | |
| 41 } | |
| 42 | |
| 43 | |
| 44 # Generic utils | |
| 45 | |
| 46 concat = lambda l: reduce(list.__add__, l, []) | |
| 47 | |
| 48 def dict_append(d, k, v): | |
| 49 d.setdefault(k, []) | |
| 50 d[k].append(v) | |
| 51 | |
| 52 | |
| 53 # Logging | |
| 54 | |
| 55 def log(*args): | |
| 56 if len(args) == 1: | |
| 57 priority, msg = LOG_INFO, args[0] | |
| 58 elif len(args) == 2: | |
| 59 priority, msg = args | |
| 60 else: | |
| 61 return | |
| 62 priority = 7 - priority | |
| 63 if priority < global_args.log_level: | |
| 64 return | |
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65 if isinstance(msg, unicode): |
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66 msg = msg.encode('utf8') |
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67 try: |
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68 if global_args.fork: |
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69 syslog(priority, msg) |
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70 else: |
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71 sys.stderr.write(log_levels[priority]+': '+msg+'\n') |
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72 except: |
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73 exit(1) |
| 1 | 74 |
| 75 def ignore_event(path, event): | |
| 76 log(LOG_DEBUG, 'ignoring event '+gamin_events.get(event, str(event))+' on '+path) | |
| 77 | |
| 78 | |
| 79 # Config parsing | |
| 80 | |
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81 def parse_config_file(config_path): |
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82 try: |
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83 config_fd = open(config_path) |
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84 except IOError as e: |
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85 return log('failed to open "'+line+'": '+str(e)) |
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86 feeds_paths = config_to_feed_paths_to_commands[config_path] = {} |
| 11 | 87 cmd = [] |
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88 log('parsing config file '+config_path) |
| 1 | 89 config_fd.seek(0) |
| 90 for i, line in enumerate(config_fd): | |
| 91 line = line.strip() | |
| 92 if len(line) == 0 or line[0] == '#': | |
| 93 continue | |
| 94 if line[0] == '%': | |
| 11 | 95 if isinstance(cmd, str): |
| 96 cmd = [] | |
| 97 cmd.append(line[1:].rstrip(';')) | |
| 98 elif not cmd: | |
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99 log(LOG_ERR, 'missing command in file '+config_path+' before line '+str(i)) |
| 1 | 100 return |
| 101 else: | |
| 11 | 102 cmd = '; '.join(cmd) |
| 1 | 103 for feed_path in glob(line): |
| 104 feed_path = abspath(feed_path) | |
| 105 dict_append(feeds_paths, feed_path, cmd) | |
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106 if not feed_path in watched_feeds: |
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107 monitor.watch_file(feed_path, handler(handle_feed_change)) |
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108 watched_feeds.add(feed_path) |
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109 log('now watching '+feed_path) |
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110 config_fd.close() |
| 1 | 111 |
| 112 | |
| 113 # Gamin callbacks | |
| 114 | |
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115 def handler(f): |
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116 def g(path, event): |
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117 try: |
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118 f(path, event) |
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119 except: |
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120 log(LOG_CRIT, traceback.format_exc()) |
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121 return g |
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122 |
| 1 | 123 def handle_config_change(path, event): |
| 124 path = abspath(path) | |
| 125 if os.path.isdir(path): | |
| 126 ignore_event(path, event) | |
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127 elif not path in config_to_feed_paths_to_commands: |
| 1 | 128 open_config(path, event) |
| 129 elif event in [gamin.GAMChanged, gamin.GAMDeleted]: | |
| 130 update_config(path, event) | |
| 131 else: | |
| 132 ignore_event(path, event) | |
| 133 | |
| 134 def open_config(path, event): | |
| 135 if event in [gamin.GAMCreated, gamin.GAMExists]: | |
| 136 if (not path.endswith('.conf') or path[0] == '.') and not hasattr(global_args.config, 'read'): | |
| 137 return log('ignoring '+path+' (not a valid config file name)') | |
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138 parse_config_file(path) |
| 1 | 139 else: |
| 140 ignore_event(path, event) | |
| 141 | |
| 142 def update_config(path, event): | |
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143 feeds_paths = set(concat(d.keys() for d in config_to_feed_paths_to_commands.values())) |
| 1 | 144 if event == gamin.GAMChanged: |
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145 parse_config_file(path) |
| 1 | 146 elif event == gamin.GAMDeleted: |
| 25 | 147 log('removing actions from deleted config file '+path) |
| 1 | 148 config_to_feed_paths_to_commands.pop(path) |
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149 new_feeds_paths = set(concat(d.keys() for d in config_to_feed_paths_to_commands.values())) |
| 1 | 150 for feed_path in feeds_paths.difference(new_feeds_paths): |
| 151 monitor.stop_watch(feed_path) | |
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152 watched_feeds.discard(feed_path) |
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153 log('stopped watching '+feed_path) |
| 1 | 154 |
| 155 def handle_feed_change(path, event): | |
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156 if event in [gamin.GAMCreated, gamin.GAMExists, gamin.GAMChanged]: |
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157 try: |
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158 feed_fd = open(path) |
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159 except IOError as e: |
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160 return log('failed to open "'+path+'": '+str(e)) |
| 1 | 161 feed = feedparser.parse(feed_fd.read()) |
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162 feed_fd.close() |
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163 i = 0 |
| 1 | 164 for entry in reversed(feed.entries): |
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165 if entry.id in state['id_cache'].get(path, []) or \ |
| 1 | 166 not global_args.flood and calendar.timegm(entry.published_parsed) < time.time() - 86400: |
| 167 continue | |
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168 i += 1 |
| 1 | 169 for feed_path_to_commands in config_to_feed_paths_to_commands.values(): |
| 170 for cmd in feed_path_to_commands.get(path, []): | |
| 171 run_command(format_cmd(cmd, feed=feed.feed, entry=entry), entry.content[0].value) | |
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172 state['id_cache'][path] = [entry.id for entry in feed.entries] |
| 1 | 173 save_state() |
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174 if i == 0: |
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175 log('no new entry in %s' % path) |
| 1 | 176 else: |
| 177 ignore_event(path, event) | |
| 178 | |
| 179 def save_state(): | |
| 180 global_args.state_file.truncate(0) | |
| 181 json.dump(state, global_args.state_file) | |
| 182 global_args.state_file.flush() | |
| 183 | |
| 184 | |
| 185 # Commands utils | |
| 186 | |
| 187 def format_cmd(cmd, **kwargs): | |
| 188 """The safe equivalent of str.format() for shell commands, meaning interpolated variables can't do shell injections (I hope).""" | |
| 189 r = u'' | |
| 190 for arg in shlex.split(cmd.encode('utf8')): | |
| 191 a = arg.decode('utf8') | |
| 192 b = a.format(**kwargs) | |
| 193 if a != b: | |
| 194 r += u" '" + b.replace(u"'", u'\'"\'"\'') + u"'" | |
| 195 else: | |
| 196 r += u' ' + arg | |
| 197 return r.lstrip() | |
| 198 | |
| 199 def run_command(cmd, input): | |
| 200 p = Popen(cmd, stdin=PIPE, stdout=PIPE, stderr=STDOUT, shell=True) | |
| 201 output = p.communicate(input.encode('utf8'))[0].decode('utf8') | |
| 202 if p.returncode != 0: | |
| 203 log(LOG_ERR, 'command failed: '+cmd+'\n'+output) | |
| 204 else: | |
| 205 log(LOG_INFO, 'successfully executed '+cmd) | |
| 206 log(LOG_DEBUG, '===== output:\n'+output) | |
| 207 | |
| 208 | |
| 209 # Argparse utils | |
| 210 | |
| 211 def AbsPath(next_type=None): | |
| 212 def f(s): | |
| 213 p = abspath(s) | |
| 214 if next_type is not None: | |
| 215 return next_type(p) | |
| 216 else: | |
| 217 return p | |
| 218 return f | |
| 219 | |
| 220 class Apply(argparse.Action): | |
| 221 def __init__(self, f, *args, **kwargs): | |
| 222 super(self.__class__, self).__init__(**kwargs) | |
| 223 self.f = f | |
| 224 def __call__(self, parser, namespace, values, option_string=None): | |
| 225 setattr(namespace, self.dest, self.f(values[0])) | |
| 226 | |
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227 def MakeDirs(next_type=None): |
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228 def f(s): |
| 7 | 229 d = dirname(s) |
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230 if d and not isdir(d): |
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231 try: |
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232 os.makedirs(d) |
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233 except OSError as e: |
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234 raise argparse.ArgumentTypeError(str(e)) |
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235 if next_type is not None: |
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236 return next_type(s) |
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237 else: |
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238 return s |
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239 return f |
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240 |
| 1 | 241 def Directory(s): |
| 242 try: | |
| 243 os.listdir(s) | |
| 244 return s | |
| 245 except OSError as e: | |
| 246 raise argparse.ArgumentTypeError(str(e)) | |
| 247 | |
| 248 def File(flags): | |
| 249 def f(s): | |
| 250 try: | |
| 251 return os.fdopen(os.open(s, flags), 'w') | |
| 252 except OSError as e: | |
| 253 raise argparse.ArgumentTypeError(str(e)) | |
| 254 return f | |
| 255 | |
| 256 class First(argparse.Action): | |
| 257 def __call__(self, parser, namespace, values, option_string=None): | |
| 258 setattr(namespace, self.dest, values[0]) | |
| 259 | |
| 260 def FirstOf(*types, **kwargs): | |
| 261 kwargs.setdefault('error', 'argument "{}" is not valid') | |
| 262 def f(s): | |
| 263 for t in types: | |
| 264 try: | |
| 265 return t(s) | |
| 266 except: | |
| 267 pass | |
| 268 raise argparse.ArgumentTypeError(error.format(s)) | |
| 269 return f | |
| 270 | |
| 271 | |
| 272 # Main | |
| 273 | |
| 274 if __name__ == '__main__': | |
| 275 | |
| 276 p = argparse.ArgumentParser() | |
| 277 p.add_argument('config', type=FirstOf(AbsPath(argparse.FileType('r')), AbsPath(Directory), error='"{}" is neither a file nor a directory'), help='either a file or a directory') | |
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278 p.add_argument('state_file', type=MakeDirs(argparse.FileType('a+')), help='e.g. /var/lib/feed-push/state') |
| 1 | 279 p.add_argument('--flood', default=False, action='store_true', help='push all articles on startup instead of ignoring the ones older than 24h (useful for debugging)') |
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280 p.add_argument('--fork', metavar='pid-file', nargs=1, type=File(os.O_WRONLY|os.O_CREAT|os.O_EXCL), action=First, help='daemonize and log to syslog') |
| 1 | 281 p.add_argument('--log-level', nargs=1, default=1, choices=log_levels, action=partial(Apply, log_levels.index), help='default is INFO') |
| 282 global_args = p.parse_args() | |
| 283 | |
| 284 if global_args.fork: | |
| 285 pid = os.fork() | |
| 286 if pid != 0: | |
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287 exit(0) |
| 19 | 288 os.setsid() |
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289 pid = os.fork() |
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290 if pid != 0: |
| 1 | 291 global_args.fork.write(str(pid)) |
| 292 exit(0) | |
| 293 openlog(facility=LOG_DAEMON) | |
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294 null = open('/dev/null', 'r+') |
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295 for f in [sys.stdin, sys.stdout, sys.stderr]: |
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296 f.flush() |
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297 os.dup2(null.fileno(), f.fileno()) |
| 1 | 298 |
| 299 state = {'id_cache': {}} | |
| 300 saved_state = global_args.state_file.read().strip() | |
| 301 if len(saved_state) > 0: | |
| 302 state.update(json.loads(saved_state)) | |
| 303 del saved_state | |
| 304 | |
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305 import gamin |
| 1 | 306 monitor = gamin.WatchMonitor() |
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307 watched_feeds = set() |
| 1 | 308 config_to_feed_paths_to_commands = {} |
| 309 if hasattr(global_args.config, 'read'): | |
| 310 os.chdir(os.path.dirname(global_args.config.name)) | |
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311 monitor.watch_file(global_args.config.name, handler(handle_config_change)) |
| 1 | 312 else: |
| 313 os.chdir(global_args.config) | |
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314 monitor.watch_directory(global_args.config, handler(handle_config_change)) |
| 1 | 315 |
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316 if global_args.fork: |
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317 while True: |
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318 monitor.handle_one_event() |
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319 else: |
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320 try: |
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321 while True: |
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322 monitor.handle_events() |
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323 time.sleep(1) |
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324 except KeyboardInterrupt: |
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325 exit(0) |