'response_body': 0,
# before returning from handler (thus setting response EOF)
'response_close': 0,
+ # after writing over 1s worth of data at self.bandwidth
+ 'mid_write': 0,
+ # after reading over 1s worth of data at self.bandwidth
+ 'mid_read': 0,
}
+ self.bandwidth = None
super(Server, self).__init__(*args, **kwargs)
def setdelays(self, **kwargs):
self.delays.get(k) # NameError if unknown key
self.delays[k] = v
+ def setbandwidth(self, bandwidth):
+ """For future requests, set the maximum bandwidth (number of bytes per
+ second) to operate at. If setbandwidth is never called, function at
+ maximum bandwidth possible"""
+ self.bandwidth = float(bandwidth)
+
def _sleep_at_least(self, seconds):
"""Sleep for given time, even if signals are received."""
wake = time.time() + seconds
class Handler(BaseHTTPServer.BaseHTTPRequestHandler, object):
+ def wfile_bandwidth_write(self, data_to_write):
+ if self.server.bandwidth == None and self.server.delays['mid_write'] == 0:
+ self.wfile.write(data_to_write)
+ else:
+ BYTES_PER_WRITE = int(self.server.bandwidth/4.0) or 32768
+ outage_happened = False
+ num_bytes = len(data_to_write)
+ num_sent_bytes = 0
+ target_time = time.time()
+ while num_sent_bytes < num_bytes:
+ if num_sent_bytes > self.server.bandwidth and not outage_happened:
+ self.server._do_delay('mid_write')
+ target_time += self.delays['mid_write']
+ outage_happened = True
+ num_write_bytes = min(BYTES_PER_WRITE,
+ num_bytes - num_sent_bytes)
+ self.wfile.write(data_to_write[
+ num_sent_bytes:num_sent_bytes+num_write_bytes])
+ num_sent_bytes += num_write_bytes
+ if self.server.bandwidth is not None:
+ target_time += num_write_bytes / self.server.bandwidth
+ self.server._sleep_at_least(target_time - time.time())
+ return None
+
+ def rfile_bandwidth_read(self, bytes_to_read):
+ if self.server.bandwidth == None and self.server.delays['mid_read'] == 0:
+ return self.rfile.read(bytes_to_read)
+ else:
+ BYTES_PER_READ = int(self.server.bandwidth/4.0) or 32768
+ data = ''
+ outage_happened = False
+ bytes_read = 0
+ target_time = time.time()
+ while bytes_to_read > bytes_read:
+ if bytes_read > self.server.bandwidth and not outage_happened:
+ self.server._do_delay('mid_read')
+ target_time += self.delays['mid_read']
+ outage_happened = True
+ next_bytes_to_read = min(BYTES_PER_READ,
+ bytes_to_read - bytes_read)
+ data += self.rfile.read(next_bytes_to_read)
+ bytes_read += next_bytes_to_read
+ if self.server.bandwidth is not None:
+ target_time += next_bytes_to_read / self.server.bandwidth
+ self.server._sleep_at_least(target_time - time.time())
+ return data
+
def handle(self, *args, **kwargs):
self.server._do_delay('request')
return super(Handler, self).handle(*args, **kwargs)
self.send_header('Content-type', 'application/octet-stream')
self.end_headers()
self.server._do_delay('response_body')
- self.wfile.write(self.server.store[datahash])
+ self.wfile_bandwidth_write(self.server.store[datahash])
+ self.server._do_delay('response_close')
+
+ def do_HEAD(self):
+ self.server._do_delay('response')
+ r = re.search(r'[0-9a-f]{32}', self.path)
+ if not r:
+ return self.send_response(422)
+ datahash = r.group(0)
+ if datahash not in self.server.store:
+ return self.send_response(404)
+ self.send_response(200)
+ self.send_header('Content-type', 'application/octet-stream')
+ self.send_header('Content-length', str(len(self.server.store[datahash])))
+ self.end_headers()
self.server._do_delay('response_close')
def do_PUT(self):
self.server._do_delay('request_body')
-
# The comments at https://bugs.python.org/issue1491 implies that Python
# 2.7 BaseHTTPRequestHandler was patched to support 100 Continue, but
# reading the actual code that ships in Debian it clearly is not, so we
# need to send the response on the socket directly.
-
- self.wfile.write("%s %d %s\r\n\r\n" %
+ self.wfile_bandwidth_write("%s %d %s\r\n\r\n" %
(self.protocol_version, 100, "Continue"))
-
- data = self.rfile.read(int(self.headers.getheader('content-length')))
+ data = self.rfile_bandwidth_read(int(self.headers.getheader('content-length')))
datahash = hashlib.md5(data).hexdigest()
self.server.store[datahash] = data
self.server._do_delay('response')
self.send_header('Content-type', 'text/plain')
self.end_headers()
self.server._do_delay('response_body')
- self.wfile.write(datahash + '+' + str(len(data)))
+ self.wfile_bandwidth_write(datahash + '+' + str(len(data)))
self.server._do_delay('response_close')
def log_request(self, *args, **kwargs):
projects / arvados.git / blobdiff