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send_task.py
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send_task.py
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#!/usr/bin/env python
# --encoding: utf-8 --
import gevent
from gevent import socket
from collections import deque
class IOStream(object):
def __init__(self, sock, address=None):
self.sock = sock
self.fileobj = sock.makefile()
self.address = address
self.read_buf = deque()
self.read_buf_size = 0
self.closed = False
def read_to_buffer(self):
# readline()是调用patch之后标准库中的socket模块的_fileobj类的readline
# 原理是每一次recv(1),并检测行结束符
# sock.recv()是调用C的socket模块 是syscall
#data = self.fileobj.readline()
if not self.closed:
data = self.sock.recv(4096)
if not data:
self.close()
return
self.read_buf.append(data)
data_length = len(data)
self.read_buf_size += data_length
return data_length
def write(self, data):
return self.sock.send(data)
def close(self):
self.sock.close()
self.closed = True
self.clear()
def clear(self):
self.read_buf.clear()
self.read_buf_size = 0
def buffer_get_size(self, size):
while True:
if self.read_buf and self.read_buf_size >= size:
return self._consume(size)
if not self.read_to_buffer():
break
return False
def buffer_get_delimiter(self, delimiter):
while True:
if self.read_buf:
loc = self.read_buf[0].find(delimiter)
if loc != -1:
delimiter_len = len(delimiter)
return self._consume(loc + delimiter_len)
if self.buffer_len() == 1:
break
_double_prefix(self.read_buf)
if not self.read_to_buffer():
break
return False
def buffer_len(self):
return len(self.read_buf)
def _consume(self, loc):
if loc == 0:
return ""
_merge_prefix(self.read_buf, loc)
self.read_buf_size -= loc
return self.read_buf.popleft()
class SendTaskClient(object):
def __init__(self, host=None, port=9001):
self.host = host
self.port = port
self.connect_timeout = 30
sock = self.connect(self.host, self.port)
self.stream = IOStream(sock)
def connect(self, host, port):
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.sock.settimeout(self.connect_timeout)
self.sock.connect((self.host, self.port))
return self.sock
def send_task(self, body):
body_length = len(body)
headers = {}
headers.setdefault("type", "request")
headers.setdefault("content-length", body_length)
headers = self.make_headers(headers)
self.stream.write(headers)
self.stream.write(body)
def recv_response(self):
response = self.stream.buffer_get_delimiter("\r\n\r\n")
response_headers = self.parse_headers(response)
content_length = response_headers.get("content-length", 0)
try:
content_length = int(content_length)
except ValueError:
raise RuntimeError("Invalid content-length.")
if content_length:
response_body = self.stream.buffer_get_size(content_length)
if response_body:
return response_body
def make_headers(self, dicts):
if not isinstance(dicts, dict):
raise RuntimeError("Invalid headers.")
f = lambda d: [str(k) + ": " + str(d[k]) + "\r\n" for k in d]
return "".join(f(dicts)) + "\r\n"
def parse_headers(self, data):
try:
lines = data.splitlines()[:-1]
headers = {}
for line in lines:
key, value = line.split(":")
headers[key.strip()] = value.strip()
except ValueError:
raise RuntimeError("Malformed request line")
self.headers = headers
return headers
def _merge_prefix(deque, size):
if len(deque) == 1 and len(deque[0]) <= size:
return
prefix = []
remaining = size
while deque and remaining > 0:
chunk = deque.popleft()
if len(chunk) > remaining:
deque.appendleft(chunk[remaining:])
chunk = chunk[:remaining]
prefix.append(chunk)
remaining -= len(chunk)
if prefix:
deque.appendleft(type(prefix[0])().join(prefix))
if not deque:
deque.appendleft(b"")
def _double_prefix(deque):
new_len = max(len(deque[0]) * 2,
(len(deque[0]) + len(deque[1])))
_merge_prefix(deque, new_len)
def run_test():
client = SendTaskClient(host="127.0.0.1")
client.send_task("test content here")
body = client.recv_response()
print body
if __name__ == '__main__':
workers = [gevent.spawn(run_test) for i in range(1000)]
gevent.joinall(workers)