1 # Copyright 2012 The Chromium Authors. All rights reserved.
2 # Use of this source code is governed by a BSD-style license that can be
3 # found in the LICENSE file.
9 import SimpleHTTPServer
14 from collections import namedtuple
16 from telemetry.core import local_server
18 ByteRange = namedtuple('ByteRange', ['from_byte', 'to_byte'])
19 ResourceAndRange = namedtuple('ResourceAndRange', ['resource', 'byte_range'])
22 class MemoryCacheHTTPRequestHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
24 protocol_version = 'HTTP/1.1' # override BaseHTTPServer setting
25 wbufsize = -1 # override StreamRequestHandler (a base class) setting
28 """Serve a GET request."""
29 resource_range = self.SendHead()
31 if not resource_range or not resource_range.resource:
33 response = resource_range.resource['response']
35 if not resource_range.byte_range:
36 self.wfile.write(response)
39 start_index = resource_range.byte_range.from_byte
40 end_index = resource_range.byte_range.to_byte
41 self.wfile.write(response[start_index:end_index + 1])
44 """Serve a HEAD request."""
47 def log_error(self, fmt, *args):
50 def log_request(self, code='-', size='-'):
51 # Dont spam the console unless it is important.
55 path = os.path.realpath(self.translate_path(self.path))
56 if path not in self.server.resource_map:
57 self.send_error(404, 'File not found')
60 resource = self.server.resource_map[path]
61 total_num_of_bytes = resource['content-length']
62 byte_range = self.GetByteRange(total_num_of_bytes)
64 # request specified a range, so set response code to 206.
65 self.send_response(206)
66 self.send_header('Content-Range',
67 'bytes %d-%d/%d' % (byte_range.from_byte,
70 total_num_of_bytes = byte_range.to_byte - byte_range.from_byte + 1
72 self.send_response(200)
74 self.send_header('Content-Length', str(total_num_of_bytes))
75 self.send_header('Content-Type', resource['content-type'])
76 self.send_header('Last-Modified',
77 self.date_time_string(resource['last-modified']))
78 if resource['zipped']:
79 self.send_header('Content-Encoding', 'gzip')
81 return ResourceAndRange(resource, byte_range)
83 def GetByteRange(self, total_num_of_bytes):
84 """Parse the header and get the range values specified.
87 total_num_of_bytes: Total # of bytes in requested resource,
88 used to calculate upper range limit.
90 A ByteRange namedtuple object with the requested byte-range values.
91 If no Range is explicitly requested or there is a failure parsing,
93 If range specified is in the format "N-", return N-END. Refer to
94 http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html for details.
95 If upper range limit is greater than total # of bytes, return upper index.
98 range_header = self.headers.getheader('Range')
99 if range_header is None:
101 if not range_header.startswith('bytes='):
104 # The range header is expected to be a string in this format:
106 # Get the upper and lower limits of the specified byte-range.
107 # We've already confirmed that range_header starts with 'bytes='.
108 byte_range_values = range_header[len('bytes='):].split('-')
112 if len(byte_range_values) == 2:
113 # If to_range is not defined return all bytes starting from from_byte.
114 to_byte = (int(byte_range_values[1]) if byte_range_values[1]
115 else total_num_of_bytes - 1)
116 # If from_range is not defined return last 'to_byte' bytes.
117 from_byte = (int(byte_range_values[0]) if byte_range_values[0]
118 else total_num_of_bytes - to_byte)
122 # Do some validation.
126 # Make to_byte the end byte by default in edge cases.
127 if to_byte < from_byte or to_byte >= total_num_of_bytes:
128 to_byte = total_num_of_bytes - 1
130 return ByteRange(from_byte, to_byte)
133 class _MemoryCacheHTTPServerImpl(SocketServer.ThreadingMixIn,
134 BaseHTTPServer.HTTPServer):
135 # Increase the request queue size. The default value, 5, is set in
136 # SocketServer.TCPServer (the parent of BaseHTTPServer.HTTPServer).
137 # Since we're intercepting many domains through this single server,
138 # it is quite possible to get more than 5 concurrent requests.
139 request_queue_size = 128
141 # Don't prevent python from exiting when there is thread activity.
142 daemon_threads = True
144 def __init__(self, host_port, handler, paths):
145 BaseHTTPServer.HTTPServer.__init__(self, host_port, handler)
146 self.resource_map = {}
148 if os.path.isdir(path):
149 self.AddDirectoryToResourceMap(path)
151 self.AddFileToResourceMap(path)
153 def AddDirectoryToResourceMap(self, directory_path):
154 """Loads all files in directory_path into the in-memory resource map."""
155 for root, dirs, files in os.walk(directory_path):
156 # Skip hidden files and folders (like .svn and .git).
157 files = [f for f in files if f[0] != '.']
158 dirs[:] = [d for d in dirs if d[0] != '.']
161 file_path = os.path.join(root, f)
162 if not os.path.exists(file_path): # Allow for '.#' files
164 self.AddFileToResourceMap(file_path)
166 def AddFileToResourceMap(self, file_path):
167 """Loads file_path into the in-memory resource map."""
168 file_path = os.path.realpath(file_path)
169 if file_path in self.resource_map:
172 with open(file_path, 'rb') as fd:
174 fs = os.fstat(fd.fileno())
175 content_type = mimetypes.guess_type(file_path)[0]
177 if content_type in ['text/html', 'text/css', 'application/javascript']:
179 sio = StringIO.StringIO()
180 gzf = gzip.GzipFile(fileobj=sio, compresslevel=9, mode='wb')
183 response = sio.getvalue()
185 self.resource_map[file_path] = {
186 'content-type': content_type,
187 'content-length': len(response),
188 'last-modified': fs.st_mtime,
189 'response': response,
194 if os.path.basename(file_path) == index:
195 dir_path = os.path.dirname(file_path)
196 self.resource_map[dir_path] = self.resource_map[file_path]
199 class MemoryCacheHTTPServerBackend(local_server.LocalServerBackend):
201 super(MemoryCacheHTTPServerBackend, self).__init__()
204 def StartAndGetNamedPorts(self, args):
205 base_dir = args['base_dir']
208 paths = args['paths']
210 if not os.path.realpath(path).startswith(os.path.realpath(os.getcwd())):
211 print >> sys.stderr, '"%s" is not under the cwd.' % path
214 server_address = (args['host'], args['port'])
215 MemoryCacheHTTPRequestHandler.protocol_version = 'HTTP/1.1'
216 self._httpd = _MemoryCacheHTTPServerImpl(
217 server_address, MemoryCacheHTTPRequestHandler, paths)
218 return [local_server.NamedPort('http', self._httpd.server_address[1])]
220 def ServeForever(self):
221 return self._httpd.serve_forever()
224 class MemoryCacheHTTPServer(local_server.LocalServer):
225 def __init__(self, paths):
226 super(MemoryCacheHTTPServer, self).__init__(
227 MemoryCacheHTTPServerBackend)
228 self._base_dir = None
231 assert os.path.exists(path), '%s does not exist.' % path
236 self._paths_as_set = set(map(os.path.realpath, paths))
238 common_prefix = os.path.commonprefix(paths)
239 if os.path.isdir(common_prefix):
240 self._base_dir = common_prefix
242 self._base_dir = os.path.dirname(common_prefix)
244 def GetBackendStartupArgs(self):
245 return {'base_dir': self._base_dir,
246 'paths': self._paths,
247 'host': self.host_ip,
252 return self._paths_as_set
256 return self.forwarder.url
258 def UrlOf(self, path):
259 relative_path = os.path.relpath(path, self._base_dir)
260 # Preserve trailing slash or backslash.
261 # It doesn't matter in a file path, but it does matter in a URL.
262 if path.endswith(os.sep) or (os.altsep and path.endswith(os.altsep)):
264 return urlparse.urljoin(self.url, relative_path.replace(os.sep, '/'))