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annotate foodtruck/views/baking.py @ 587:d4a01a023998

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admin: Add "FoodTruck" admin panel from the side experiment project.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 16 Jan 2016 14:24:35 -0800
parents
children 79a31a3c947b
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587
d4a01a023998 admin: Add "FoodTruck" admin panel from the side experiment project.
Ludovic Chabant <ludovic@chabant.com>
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1 import os
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2 import os.path
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3 import time
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4 import signal
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5 import logging
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6 from werkzeug.wrappers import Response
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7 from flask import g, redirect
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8 from flask.ext.login import login_required
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9 from ..web import app
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10
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11
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12 logger = logging.getLogger(__name__)
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13
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14 server_shutdown = False
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15
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16
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17 def _shutdown_server_and_raise_sigint():
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18 if not app.debug or os.environ.get('WERKZEUG_RUN_MAIN') == 'true':
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19 # This is needed when hitting CTRL+C to shutdown the Werkzeug server,
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20 # otherwise SSE generators will keep it alive.
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21 logger.debug("Shutting down SSE generators...")
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22 global server_shutdown
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23 server_shutdown = True
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24 raise KeyboardInterrupt()
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25
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26
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27 # Make sure CTRL+C works correctly.
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28 signal.signal(signal.SIGINT,
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29 lambda *args: _shutdown_server_and_raise_sigint())
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30
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31
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32 class _BakeLogReader(object):
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33 _bake_max_time = 10 * 60 # Don't bother about bakes older than 10mins.
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34 _poll_interval = 2 # Check the PID file every 2 seconds.
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35 _ping_interval = 30 # Send a ping message every 30 seconds.
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36
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37 def __init__(self, pid_path, log_path):
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38 self.pid_path = pid_path
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39 self.log_path = log_path
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40 self._bake_pid_mtime = 0
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41 self._last_seek = 0
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42 self._last_ping_time = 0
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43
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44 def run(self):
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45 logger.debug("Opening bake log...")
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46
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47 try:
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48 while not server_shutdown:
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49 # PING!
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50 interval = time.time() - self._last_ping_time
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51 if interval > self._ping_interval:
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52 logger.debug("Sending ping...")
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53 self._last_ping_time = time.time()
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54 yield bytes("event: ping\ndata: 1\n\n", 'utf8')
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55
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56 # Check pid file.
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57 prev_mtime = self._bake_pid_mtime
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58 try:
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59 self._bake_pid_mtime = os.path.getmtime(self.pid_path)
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60 if time.time() - self._bake_pid_mtime > \
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61 self._bake_max_time:
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62 self._bake_pid_mtime = 0
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63 except OSError:
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64 self._bake_pid_mtime = 0
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65
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66 # Send data.
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67 new_data = None
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68 if self._bake_pid_mtime > 0 or prev_mtime > 0:
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69 if self._last_seek == 0:
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70 outstr = 'event: message\ndata: Bake started.\n\n'
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71 yield bytes(outstr, 'utf8')
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72
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73 try:
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74 with open(self.log_path, 'r', encoding='utf8') as fp:
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75 fp.seek(self._last_seek)
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76 new_data = fp.read()
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77 self._last_seek = fp.tell()
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78 except OSError:
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79 pass
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80 if self._bake_pid_mtime == 0:
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81 self._last_seek = 0
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82
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83 if new_data:
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84 logger.debug("SSE: %s" % outstr)
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85 for line in new_data.split('\n'):
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86 outstr = 'event: message\ndata: %s\n\n' % line
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87 yield bytes(outstr, 'utf8')
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88
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89 time.sleep(self._poll_interval)
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90
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91 except GeneratorExit:
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92 pass
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93
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94 logger.debug("Closing bake log...")
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95
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96
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97 @app.route('/bake', methods=['POST'])
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98 @login_required
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99 def bake_site():
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100 site = g.sites.get()
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101 site.bake()
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102 return redirect('/')
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103
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104
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105 @app.route('/bakelog')
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106 @login_required
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107 def stream_bake_log():
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108 site = g.sites.get()
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109 pid_path = os.path.join(site.root_dir, 'foodtruck_bake.pid')
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110 log_path = os.path.join(site.root_dir, 'foodtruck_bake.log')
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111 rdr = _BakeLogReader(pid_path, log_path)
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112
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113 response = Response(rdr.run(), mimetype='text/event-stream')
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114 response.headers['Cache-Control'] = 'no-cache'
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115 return response
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116