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http_tail.py
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http_tail.py
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#!/bin/python
'''
Copyright (C) 2011 by Paolo Victor
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
'''
import BaseHTTPServer
import commands
import os
import re
import sys
from urlparse import urlparse, parse_qs
HTTP_TAIL_GET_FILE_SIZE_CMD = 'wc -l %s | cut -d \' \' -f1'
HTTP_TAIL_TAIL_CMD = 'tail -%d %s'
HTTP_TAIL_VIEW_TEMPLATE = 'view.html'
HTTP_TAIL_MAX_RESPONSE_SIZE = 20000
class HTTPTailRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
def do_GET(self):
tokens = self.path.split('/')[1:] # Ignoring first, empty element
request = urlparse(self.path)
query = parse_qs(request.query)
try:
if request.path == '/view':
if self.server.template_data is None or True:
self.server.template_data = ''
template_path = os.path.join(os.path.dirname(__file__), HTTP_TAIL_VIEW_TEMPLATE)
for line in open(template_path):
line = line.replace('HOST_ADDRESS', '%s:%d' % self.server.server_address)
line = line.replace('FILE_NAME', '%s' % self.server.watched_file)
self.server.template_data += line
self.do_HEAD(200, "text/html")
self.wfile.write(self.server.template_data)
elif request.path == '/tail':
filename = query['file'][0]
start = int(query['start_line'][0])
file_len = int(commands.getoutput(HTTP_TAIL_GET_FILE_SIZE_CMD % filename))
tail_len = file_len - start
self.do_HEAD(200, "text/plain")
if filename == self.server.watched_file:
#data = commands.getoutput('tail -%d %s | head -%d' % \
# (tail_len, self.server.watched_file, HTTP_TAIL_MAX_RESPONSE_SIZE))
data = commands.getoutput('tail -%d %s' % \
(tail_len, self.server.watched_file))
self.wfile.write(data)
except ValueError:
self.do_HEAD(400)
raise
def do_HEAD(self, code = 200, ctype = None):
self.send_response(code)
if ctype:
self.send_header("Content-type", ctype)
self.end_headers()
if __name__ == '__main__':
filename = sys.argv[1]
ip = sys.argv[2]
port = int(sys.argv[3])
if not os.path.exists(filename):
print "File not found: %s" % filename
exit(1)
server_address = (ip, port)
httpd = BaseHTTPServer.HTTPServer(server_address, HTTPTailRequestHandler)
httpd.watched_file = filename
httpd.template_data = None
httpd.serve_forever()