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direct_handler.py
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220 lines (185 loc) · 8.71 KB
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#!/usr/bin/env python
# coding:utf-8
import errno
import time
import re
import socket
import ssl
import http.client
import OpenSSL
NetWorkIOError = (socket.error, ssl.SSLError, OpenSSL.SSL.Error, OSError)
from .connect_manager import https_manager
from .gae_handler import return_fail_message
from .google_ip import google_ip
from .config import config
from xlog import getLogger
xlog = getLogger("gae_proxy")
#"GAE", "Google Frontend", "GSE", "GFE/2.0",
google_server_types = ["ClientMapServer"]
def send_header(wfile, keyword, value):
keyword = keyword.title()
if keyword == 'Set-Cookie':
for cookie in re.split(r', (?=[^ =]+(?:=|$))', value):
wfile.write(("%s: %s\r\n" % (keyword, cookie)).encode())
#logging.debug("Head1 %s: %s", keyword, cookie)
elif keyword == 'Content-Disposition' and '"' not in value:
value = re.sub(r'filename=([^"\']+)', 'filename="\\1"', value)
wfile.write(("%s: %s\r\n" % (keyword, value)).encode())
#logging.debug("Head1 %s: %s", keyword, value)
elif keyword == "Alternate-Protocol":
return
else:
#logging.debug("Head1 %s: %s", keyword, value)
wfile.write(("%s: %s\r\n" % (keyword, value)).encode())
def fetch(method, host, path, headers, payload, bufsize=8192):
request_data = '%s %s HTTP/1.1\r\n' % (method, path)
request_data += ''.join('%s: %s\r\n' % (k, v) for k, v in headers.items())
request_data += '\r\n'
ssl_sock = https_manager.get_ssl_connection(host)
if not ssl_sock:
return
try:
ssl_sock.send(request_data.encode())
payload_len = len(payload)
start = 0
while start < payload_len:
send_size = min(payload_len - start, 65535)
sended = ssl_sock.send(payload[start:start+send_size])
start += sended
response = http.client.HTTPResponse(ssl_sock)
response.ssl_sock = ssl_sock
orig_timeout = ssl_sock.gettimeout()
ssl_sock.settimeout(90)
response.begin()
ssl_sock.settimeout(orig_timeout)
except http.client.BadStatusLine as e:
xlog.warn("direct_handler.fetch bad status line:%r", e)
google_ip.report_connect_closed(ssl_sock.ip, "request_fail")
response = None
except Exception as e:
xlog.warn("direct_handler.fetch:%r", e)
google_ip.report_connect_closed(ssl_sock.ip, "request_fail")
response = None
return response
def handler(method, host, url, headers, body, wfile):
time_request = time.time()
if "Connection" in headers and headers["Connection"] == "close":
del headers["Connection"]
errors = []
response = None
while True:
if time.time() - time_request > 30:
return return_fail_message(wfile)
try:
response = fetch(method, host, url, headers, body)
if response:
if response.status > 400:
server_type = response.getheader('Server', "")
if "G" not in server_type and "g" not in server_type and server_type not in google_server_types:
xlog.warn("IP:%s host:%s not support GAE, server type:%s status:%d", response.ssl_sock.ip, host, server_type, response.status)
google_ip.report_connect_fail(response.ssl_sock.ip)
response.close()
continue
break
except OpenSSL.SSL.SysCallError as e:
errors.append(e)
xlog.warn("direct_handler.handler err:%r %s/%s", e, host, url)
except Exception as e:
errors.append(e)
xlog.exception('direct_handler.handler %r %s %s , retry...', e, host, url)
try:
send_to_browser = True
try:
response_headers = dict((k.title(), v) for k, v in response.getheaders())
wfile.write(("HTTP/1.1 %d %s\r\n" % (response.status, response.reason)).encode())
for key, value in response.getheaders():
send_header(wfile, key, value)
wfile.write(b"\r\n")
except Exception as e:
send_to_browser = False
wait_time = time.time()-time_request
xlog.warn("direct_handler.handler send response fail. t:%d e:%r %s%s", wait_time, e, host, url)
if method == 'HEAD' or response.status in (204, 304):
xlog.info("DIRECT t:%d %d %s %s", (time.time()-time_request)*1000, response.status, host, url)
https_manager.save_ssl_connection_for_reuse(response.ssl_sock, host)
response.close()
return
if 'Transfer-Encoding' in response_headers:
length = 0
while True:
try:
data = response.read(8192)
except http.client.IncompleteRead as e:
data = e.partial
except Exception as e:
google_ip.report_connect_closed(response.ssl_sock.ip, "receive fail")
xlog.warn("direct_handler.handler send Transfer-Encoding t:%d e:%r %s/%s", time.time()-time_request, e, host, url)
response.close()
return
if send_to_browser:
try:
if not data:
wfile.write(b'0\r\n\r\n')
break
length += len(data)
wfile.write(('%x\r\n' % len(data)).encode())
wfile.write(data)
wfile.write(b'\r\n')
except Exception as e:
send_to_browser = False
xlog.warn("direct_handler.handler send Transfer-Encoding t:%d e:%r %s/%s", time.time()-time_request, e, host, url)
else:
if not data:
break
https_manager.save_ssl_connection_for_reuse(response.ssl_sock, host)
response.close()
xlog.info("DIRECT chucked t:%d s:%d %d %s %s", (time.time()-time_request)*1000, length, response.status, host, url)
return
content_length = int(response.getheader('Content-Length', 0))
content_range = response.getheader('Content-Range', '')
if content_range:
start, end, length = tuple(int(x) for x in re.search(r'bytes (\d+)-(\d+)/(\d+)', content_range).group(1, 2, 3))
else:
start, end, length = 0, content_length-1, content_length
time_last_read = time.time()
while True:
if start > end:
https_manager.save_ssl_connection_for_reuse(response.ssl_sock, host, call_time=time_request)
xlog.info("DIRECT t:%d s:%d %d %s %s", (time.time()-time_request)*1000, length, response.status, host, url)
return
data = response.read(config.AUTORANGE_BUFSIZE)
if not data:
if time.time() - time_last_read > 20:
google_ip.report_connect_closed(response.ssl_sock.ip, "receive fail")
response.close()
xlog.warn("read timeout t:%d len:%d left:%d %s %s", (time.time()-time_request)*1000, length, (end-start), host, url)
return
else:
time.sleep(0.1)
continue
time_last_read = time.time()
data_len = len(data)
start += data_len
if send_to_browser:
try:
ret = wfile.write(data)
if ret == ssl.SSL_ERROR_WANT_WRITE or ret == ssl.SSL_ERROR_WANT_READ:
xlog.debug("send to browser wfile.write ret:%d", ret)
ret = wfile.write(data)
except Exception as e_b:
if e_b[0] in (errno.ECONNABORTED, errno.EPIPE, errno.ECONNRESET) or 'bad write retry' in repr(e_b):
xlog.warn('direct_handler send to browser return %r %s %r', e_b, host, url)
else:
xlog.warn('direct_handler send to browser return %r %s %r', e_b, host, url)
send_to_browser = False
except NetWorkIOError as e:
google_ip.report_connect_closed(response.ssl_sock.ip, "receive fail")
time_except = time.time()
time_cost = time_except - time_request
if e[0] in (errno.ECONNABORTED, errno.EPIPE) or 'bad write retry' in repr(e):
xlog.exception("direct_handler err:%r %s %s time:%d", e, host, url, time_cost)
else:
xlog.exception("direct_handler except:%r %s %s", e, host, url)
except Exception as e:
google_ip.report_connect_closed(response.ssl_sock.ip, "receive fail")
xlog.exception("direct_handler except:%r %s %s", e, host, url)