/usr/lib/python2.7/dist-packages/livereload/handlers.py is in python-livereload 2.2.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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"""
livereload.handlers
~~~~~~~~~~~~~~~~~~~
HTTP and WebSocket handlers for livereload.
:copyright: (c) 2013 by Hsiaoming Yang
"""
import os
import time
import hashlib
import logging
import mimetypes
from tornado import ioloop
from tornado import escape
from tornado.websocket import WebSocketHandler
from tornado.web import RequestHandler
from tornado.util import ObjectDict
from ._compat import to_bytes
class LiveReloadHandler(WebSocketHandler):
waiters = set()
watcher = None
_last_reload_time = None
def allow_draft76(self):
return True
def check_origin(self, origin):
return True
def on_close(self):
if self in LiveReloadHandler.waiters:
LiveReloadHandler.waiters.remove(self)
def send_message(self, message):
if isinstance(message, dict):
message = escape.json_encode(message)
try:
self.write_message(message)
except:
logging.error('Error sending message', exc_info=True)
def poll_tasks(self):
filepath = self.watcher.examine()
if not filepath:
return
logging.info('File %s changed', filepath)
self.watch_tasks()
def watch_tasks(self):
if time.time() - self._last_reload_time < 3:
# if you changed lot of files in one time
# it will refresh too many times
logging.info('ignore this reload action')
return
logging.info('Reload %s waiters', len(self.waiters))
msg = {
'command': 'reload',
'path': self.watcher.filepath or '*',
'liveCSS': True
}
self._last_reload_time = time.time()
for waiter in LiveReloadHandler.waiters:
try:
waiter.write_message(msg)
except:
logging.error('Error sending message', exc_info=True)
LiveReloadHandler.waiters.remove(waiter)
def on_message(self, message):
"""Handshake with livereload.js
1. client send 'hello'
2. server reply 'hello'
3. client send 'info'
http://feedback.livereload.com/knowledgebase/articles/86174-livereload-protocol
"""
message = ObjectDict(escape.json_decode(message))
if message.command == 'hello':
handshake = {}
handshake['command'] = 'hello'
handshake['protocols'] = [
'http://livereload.com/protocols/official-7',
'http://livereload.com/protocols/official-8',
'http://livereload.com/protocols/official-9',
'http://livereload.com/protocols/2.x-origin-version-negotiation',
'http://livereload.com/protocols/2.x-remote-control'
]
handshake['serverName'] = 'livereload-tornado'
self.send_message(handshake)
if message.command == 'info' and 'url' in message:
logging.info('Browser Connected: %s' % message.url)
LiveReloadHandler.waiters.add(self)
if not LiveReloadHandler._last_reload_time:
if not self.watcher._tasks:
logging.info('Watch current working directory')
self.watcher.watch(os.getcwd())
LiveReloadHandler._last_reload_time = time.time()
logging.info('Start watching changes')
if not self.watcher.start(self.poll_tasks):
ioloop.PeriodicCallback(self.poll_tasks, 800).start()
class LiveReloadJSHandler(RequestHandler):
def initialize(self, port):
self._port = port
def get(self):
js = os.path.join(
os.path.abspath(os.path.dirname(__file__)), 'livereload.js',
)
self.set_header('Content-Type', 'application/javascript')
with open(js, 'r') as f:
content = f.read()
content = content.replace('{{port}}', str(self._port))
self.write(content)
class ForceReloadHandler(RequestHandler):
def get(self):
msg = {
'command': 'reload',
'path': self.get_argument('path', default=None) or '*',
'liveCSS': True,
'liveImg': True
}
for waiter in LiveReloadHandler.waiters:
try:
waiter.write_message(msg)
except:
logging.error('Error sending message', exc_info=True)
LiveReloadHandler.waiters.remove(waiter)
self.write('ok')
class StaticHandler(RequestHandler):
def initialize(self, root, fallback=None):
self._root = os.path.abspath(root)
self._fallback = fallback
def filepath(self, url):
url = url.lstrip('/')
url = os.path.join(self._root, url)
if url.endswith('/'):
url += 'index.html'
elif not os.path.exists(url) and not url.endswith('.html'):
url += '.html'
if not os.path.isfile(url):
return None
return url
def get(self, path='/'):
filepath = self.filepath(path)
if not filepath and path.endswith('/'):
rootdir = os.path.join(self._root, path.lstrip('/'))
return self.create_index(rootdir)
if not filepath:
if self._fallback:
self._fallback(self.request)
self._finished = True
return
return self.send_error(404)
mime_type, encoding = mimetypes.guess_type(filepath)
if not mime_type:
mime_type = 'text/html'
self.mime_type = mime_type
self.set_header('Content-Type', mime_type)
if mime_type.startswith('text'):
with open(filepath, 'r') as f:
data = f.read()
else:
with open(filepath, 'rb') as f:
data = f.read()
hasher = hashlib.sha1()
hasher.update(to_bytes(data))
self.set_header('Etag', '"%s"' % hasher.hexdigest())
ua = self.request.headers.get('User-Agent', 'bot').lower()
if mime_type == 'text/html' and 'msie' not in ua:
data = data.replace(
'</head>',
'<script src="/livereload.js"></script></head>'
)
self.write(data)
def create_index(self, root):
files = os.listdir(root)
self.write('<ul>')
for f in files:
path = os.path.join(root, f)
self.write('<li>')
if os.path.isdir(path):
self.write('<a href="%s/">%s</a>' % (f, f))
else:
self.write('<a href="%s">%s</a>' % (f, f))
self.write('</li>')
self.write('</ul>')
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