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annotate foodtruck/pubutil.py @ 615:cbb170d9c894

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admin: Improve publish logs showing as alerts in the admin panel. * Don't show stuff that happened before the page was opened. * Skinning tweaks.
author Ludovic Chabant <ludovic@chabant.com>
date Thu, 04 Feb 2016 21:50:18 -0800
parents e2e955a3bb25
children 65706804e1de
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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c6bc0ef03f82 admin: Better UI for publishing websites.
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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 errno
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5 import signal
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6 import logging
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7 from .web import app
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8
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9
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10 logger = logging.getLogger(__name__)
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11
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12 server_shutdown = False
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13
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14
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15 def _shutdown_server_and_raise_sigint():
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16 if not app.debug or os.environ.get('WERKZEUG_RUN_MAIN') == 'true':
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17 # This is needed when hitting CTRL+C to shutdown the Werkzeug server,
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18 # otherwise SSE generators will keep it alive.
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19 logger.debug("Shutting down SSE generators...")
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20 global server_shutdown
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21 server_shutdown = True
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22 raise KeyboardInterrupt()
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23
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24
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25 if app.config['FOODTRUCK_CMDLINE_MODE']:
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26 # Make sure CTRL+C works correctly.
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27 signal.signal(signal.SIGINT,
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28 lambda *args: _shutdown_server_and_raise_sigint())
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29
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30
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31 def _read_pid_file(pid_file):
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32 logger.debug("Reading PID file: %s" % pid_file)
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33 try:
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34 with open(pid_file, 'r') as fp:
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35 pid_str = fp.read()
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36
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37 return int(pid_str.strip())
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38 except Exception:
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39 logger.error("Error reading PID file.")
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40 raise
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41
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42
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43 def _pid_exists(pid):
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44 logger.debug("Checking if process ID %d is running" % pid)
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45 try:
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46 os.kill(pid, 0)
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47 except OSError as ex:
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48 if ex.errno == errno.ESRCH:
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49 # No such process.
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50 return False
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51 elif ex.errno == errno.EPERM:
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52 # No permission, so process exists.
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53 return True
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54 else:
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55 raise
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56 else:
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57 return True
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58
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59
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60 class PublishLogReader(object):
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61 _poll_interval = 1 # Check the process every 1 seconds.
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62 _ping_interval = 30 # Send a ping message every 30 seconds.
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63
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64 def __init__(self, pid_path, log_path):
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65 self.pid_path = pid_path
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66 self.log_path = log_path
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67
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68 def run(self):
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69 logger.debug("Opening publish log...")
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70 pid = None
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71 pid_mtime = 0
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72 is_running = False
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73 last_seek = -1
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74 last_ping_time = 0
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75 try:
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76 while not server_shutdown:
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77 # PING!
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78 interval = time.time() - last_ping_time
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79 if interval > self._ping_interval:
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80 logger.debug("Sending ping...")
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81 last_ping_time = time.time()
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82 yield bytes("event: ping\ndata: 1\n\n", 'utf8')
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83
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84 # Check the PID file timestamp.
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85 try:
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86 new_mtime = os.path.getmtime(self.pid_path)
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87 except OSError:
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88 new_mtime = 0
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89
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90 # If there's a valid PID file and we either just started
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91 # streaming (pid_mtime == 0) or we remember an older version
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92 # of that PID file (pid_mtime != new_mtime), let's read the
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93 # PID from the file.
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94 is_pid_file_prehistoric = False
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95 if new_mtime > 0 and new_mtime != pid_mtime:
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96 is_pid_file_prehistoric = (pid_mtime == 0)
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97 pid_mtime = new_mtime
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98 pid = _read_pid_file(self.pid_path)
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99
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100 if is_pid_file_prehistoric:
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101 logger.debug("PID file is pre-historic, we will skip the "
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102 "first parts of the log.")
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103
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104 # If we have a valid PID, let's check if the process is
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105 # currently running.
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106 was_running = is_running
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107 if pid:
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108 is_running = _pid_exists(pid)
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109 logger.debug(
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110 "Process %d is %s" %
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111 (pid, 'running' if is_running else 'not running'))
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112 if not is_running:
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113 # Let's forget this PID file until it changes.
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114 pid = None
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115 else:
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116 is_running = False
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117
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118 # Read new data from the log file.
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119 new_data = None
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120 if is_running or was_running:
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121 if last_seek < 0:
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122 # Only send the "publish started" message if we
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123 # actually caught the process as it was starting, not
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124 # if we started streaming after it started.
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125 # This means we saw the PID file get changed.
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126 if not is_pid_file_prehistoric:
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127 outstr = (
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128 'event: message\n'
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129 'data: Publish started.\n\n')
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130 yield bytes(outstr, 'utf8')
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131 last_seek = 0
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132
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133 try:
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134 with open(self.log_path, 'r', encoding='utf8') as fp:
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135 fp.seek(last_seek)
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136 new_data = fp.read()
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parents: 613
diff changeset
137 last_seek = fp.tell()
602
c6bc0ef03f82 admin: Better UI for publishing websites.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
138 except OSError:
c6bc0ef03f82 admin: Better UI for publishing websites.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
139 pass
613
e2e955a3bb25 publish: Add publish command.
Ludovic Chabant <ludovic@chabant.com>
parents: 609
diff changeset
140 if not is_running:
615
cbb170d9c894 admin: Improve publish logs showing as alerts in the admin panel.
Ludovic Chabant <ludovic@chabant.com>
parents: 613
diff changeset
141 # Process is not running anymore, let's reset our seek
cbb170d9c894 admin: Improve publish logs showing as alerts in the admin panel.
Ludovic Chabant <ludovic@chabant.com>
parents: 613
diff changeset
142 # marker back to the beginning.
cbb170d9c894 admin: Improve publish logs showing as alerts in the admin panel.
Ludovic Chabant <ludovic@chabant.com>
parents: 613
diff changeset
143 last_seek = -1
602
c6bc0ef03f82 admin: Better UI for publishing websites.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
144
615
cbb170d9c894 admin: Improve publish logs showing as alerts in the admin panel.
Ludovic Chabant <ludovic@chabant.com>
parents: 613
diff changeset
145 # Stream the new data to the client, but don't send old stuff
cbb170d9c894 admin: Improve publish logs showing as alerts in the admin panel.
Ludovic Chabant <ludovic@chabant.com>
parents: 613
diff changeset
146 # that happened before we started this stream.
cbb170d9c894 admin: Improve publish logs showing as alerts in the admin panel.
Ludovic Chabant <ludovic@chabant.com>
parents: 613
diff changeset
147 if new_data and not is_pid_file_prehistoric:
613
e2e955a3bb25 publish: Add publish command.
Ludovic Chabant <ludovic@chabant.com>
parents: 609
diff changeset
148 logger.debug("SSE: %s" % new_data)
602
c6bc0ef03f82 admin: Better UI for publishing websites.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
149 for line in new_data.split('\n'):
c6bc0ef03f82 admin: Better UI for publishing websites.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
150 outstr = 'event: message\ndata: %s\n\n' % line
c6bc0ef03f82 admin: Better UI for publishing websites.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
151 yield bytes(outstr, 'utf8')
c6bc0ef03f82 admin: Better UI for publishing websites.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
152
c6bc0ef03f82 admin: Better UI for publishing websites.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
153 time.sleep(self._poll_interval)
c6bc0ef03f82 admin: Better UI for publishing websites.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
154
c6bc0ef03f82 admin: Better UI for publishing websites.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
155 except GeneratorExit:
c6bc0ef03f82 admin: Better UI for publishing websites.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
156 pass
c6bc0ef03f82 admin: Better UI for publishing websites.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
157
c6bc0ef03f82 admin: Better UI for publishing websites.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
158 logger.debug("Closing publish log...")
c6bc0ef03f82 admin: Better UI for publishing websites.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
159