--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/foodtruck/pubutil.py	Wed Jan 27 18:02:25 2016 -0800
@@ -0,0 +1,93 @@
+import os
+import os.path
+import time
+import signal
+import logging
+from .web import app
+
+
+logger = logging.getLogger(__name__)
+
+server_shutdown = False
+
+
+def _shutdown_server_and_raise_sigint():
+    if not app.debug or os.environ.get('WERKZEUG_RUN_MAIN') == 'true':
+        # This is needed when hitting CTRL+C to shutdown the Werkzeug server,
+        # otherwise SSE generators will keep it alive.
+        logger.debug("Shutting down SSE generators...")
+        global server_shutdown
+        server_shutdown = True
+    raise KeyboardInterrupt()
+
+
+if app.config['FOODTRUCK_CMDLINE_MODE']:
+    # Make sure CTRL+C works correctly.
+    signal.signal(signal.SIGINT,
+                  lambda *args: _shutdown_server_and_raise_sigint())
+
+
+class PublishLogReader(object):
+    _pub_max_time = 10 * 60   # Don't bother about pubs older than 10mins.
+    _poll_interval = 2        # Check the PID file every 2 seconds.
+    _ping_interval = 30       # Send a ping message every 30 seconds.
+
+    def __init__(self, pid_path, log_path):
+        self.pid_path = pid_path
+        self.log_path = log_path
+        self._pub_pid_mtime = 0
+        self._last_seek = 0
+        self._last_ping_time = 0
+
+    def run(self):
+        logger.debug("Opening publish log...")
+
+        try:
+            while not server_shutdown:
+                # PING!
+                interval = time.time() - self._last_ping_time
+                if interval > self._ping_interval:
+                    logger.debug("Sending ping...")
+                    self._last_ping_time = time.time()
+                    yield bytes("event: ping\ndata: 1\n\n", 'utf8')
+
+                # Check pid file.
+                prev_mtime = self._pub_pid_mtime
+                try:
+                    self._pub_pid_mtime = os.path.getmtime(self.pid_path)
+                    if time.time() - self._pub_pid_mtime > \
+                            self._pub_max_time:
+                        self._pub_pid_mtime = 0
+                except OSError:
+                    self._pub_pid_mtime = 0
+
+                # Send data.
+                new_data = None
+                if self._pub_pid_mtime > 0 or prev_mtime > 0:
+                    if self._last_seek == 0:
+                        outstr = 'event: message\ndata: Publish started.\n\n'
+                        yield bytes(outstr, 'utf8')
+
+                    try:
+                        with open(self.log_path, 'r', encoding='utf8') as fp:
+                            fp.seek(self._last_seek)
+                            new_data = fp.read()
+                            self._last_seek = fp.tell()
+                    except OSError:
+                        pass
+                if self._pub_pid_mtime == 0:
+                    self._last_seek = 0
+
+                if new_data:
+                    logger.debug("SSE: %s" % outstr)
+                    for line in new_data.split('\n'):
+                        outstr = 'event: message\ndata: %s\n\n' % line
+                        yield bytes(outstr, 'utf8')
+
+                time.sleep(self._poll_interval)
+
+        except GeneratorExit:
+            pass
+
+        logger.debug("Closing publish log...")
+