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FastCGIClient.py
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#!/usr/bin/python
import socket
import random
class FastCGIClient:
"""A Fast-CGI Client for Python"""
# private
__FCGI_VERSION = 1
__FCGI_ROLE_RESPONDER = 1
__FCGI_ROLE_AUTHORIZER = 2
__FCGI_ROLE_FILTER = 3
__FCGI_TYPE_BEGIN = 1
__FCGI_TYPE_ABORT = 2
__FCGI_TYPE_END = 3
__FCGI_TYPE_PARAMS = 4
__FCGI_TYPE_STDIN = 5
__FCGI_TYPE_STDOUT = 6
__FCGI_TYPE_STDERR = 7
__FCGI_TYPE_DATA = 8
__FCGI_TYPE_GETVALUES = 9
__FCGI_TYPE_GETVALUES_RESULT = 10
__FCGI_TYPE_UNKOWNTYPE = 11
__FCGI_HEADER_SIZE = 8
# request state
FCGI_STATE_SEND = 1
FCGI_STATE_ERROR = 2
FCGI_STATE_SUCCESS = 3
def __init__(self, host, port, timeout, keepalive):
self.host = host
self.port = port
self.timeout = timeout
if keepalive:
self.keepalive = 1
else:
self.keepalive = 0
self.sock = None
self.requests = dict()
def __connect(self):
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.sock.settimeout(self.timeout)
self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
# if self.keepalive:
# self.sock.setsockopt(socket.SOL_SOCKET, socket.SOL_KEEPALIVE, 1)
# else:
# self.sock.setsockopt(socket.SOL_SOCKET, socket.SOL_KEEPALIVE, 0)
try:
self.sock.connect((self.host, int(self.port)))
except socket.error as msg:
self.sock.close()
self.sock = None
print(repr(msg))
return False
return True
def __encodeFastCGIRecord(self, fcgi_type, content, requestid):
length = len(content)
return chr(FastCGIClient.__FCGI_VERSION) \
+ chr(fcgi_type) \
+ chr((requestid >> 8) & 0xFF) \
+ chr(requestid & 0xFF) \
+ chr((length >> 8) & 0xFF) \
+ chr(length & 0xFF) \
+ chr(0) \
+ chr(0) \
+ content
def __encodeNameValueParams(self, name, value):
nLen = len(str(name))
vLen = len(str(value))
record = ''
if nLen < 128:
record += chr(nLen)
else:
record += chr((nLen >> 24) | 0x80) \
+ chr((nLen >> 16) & 0xFF) \
+ chr((nLen >> 8) & 0xFF) \
+ chr(nLen & 0xFF)
if vLen < 128:
record += chr(vLen)
else:
record += chr((vLen >> 24) | 0x80) \
+ chr((vLen >> 16) & 0xFF) \
+ chr((vLen >> 8) & 0xFF) \
+ chr(vLen & 0xFF)
return record + str(name) + str(value)
def __decodeFastCGIHeader(self, stream):
header = dict()
header['version'] = ord(stream[0])
header['type'] = ord(stream[1])
header['requestId'] = (ord(stream[2]) << 8) + ord(stream[3])
header['contentLength'] = (ord(stream[4]) << 8) + ord(stream[5])
header['paddingLength'] = ord(stream[6])
header['reserved'] = ord(stream[7])
return header
def __decodeFastCGIRecord(self):
header = self.sock.recv(int(FastCGIClient.__FCGI_HEADER_SIZE))
if not header:
return False
else:
record = self.__decodeFastCGIHeader(header)
record['content'] = ''
if 'contentLength' in record.keys():
contentLength = int(record['contentLength'])
buffer = self.sock.recv(contentLength)
while contentLength and buffer:
contentLength -= len(buffer)
record['content'] += buffer
if 'paddingLength' in record.keys():
skiped = self.sock.recv(int(record['paddingLength']))
return record
def request(self, nameValuePairs={}, post=''):
if not self.__connect():
print('connect failure! please check your fasctcgi-server !!')
return
requestId = random.randint(1, (1 << 16) - 1)
self.requests[requestId] = dict()
request = ""
beginFCGIRecordContent = chr(0) \
+ chr(FastCGIClient.__FCGI_ROLE_RESPONDER) \
+ chr(self.keepalive) \
+ chr(0) * 5
request += self.__encodeFastCGIRecord(FastCGIClient.__FCGI_TYPE_BEGIN,
beginFCGIRecordContent, requestId)
paramsRecord = ''
if nameValuePairs:
for (name, value) in nameValuePairs.iteritems():
# paramsRecord = self.__encodeNameValueParams(name, value)
# request += self.__encodeFastCGIRecord(FastCGIClient.__FCGI_TYPE_PARAMS, paramsRecord, requestId)
paramsRecord += self.__encodeNameValueParams(name, value)
if paramsRecord:
request += self.__encodeFastCGIRecord(FastCGIClient.__FCGI_TYPE_PARAMS, paramsRecord, requestId)
request += self.__encodeFastCGIRecord(FastCGIClient.__FCGI_TYPE_PARAMS, '', requestId)
if post:
request += self.__encodeFastCGIRecord(FastCGIClient.__FCGI_TYPE_STDIN, post, requestId)
request += self.__encodeFastCGIRecord(FastCGIClient.__FCGI_TYPE_STDIN, '', requestId)
self.sock.send(request)
self.requests[requestId]['state'] = FastCGIClient.FCGI_STATE_SEND
self.requests[requestId]['response'] = ''
return self.__waitForResponse(requestId)
def __waitForResponse(self, requestId):
while True:
response = self.__decodeFastCGIRecord()
if not response:
break
if response['type'] == FastCGIClient.__FCGI_TYPE_STDOUT \
or response['type'] == FastCGIClient.__FCGI_TYPE_STDERR:
if response['type'] == FastCGIClient.__FCGI_TYPE_STDERR:
self.requests['state'] = FastCGIClient.FCGI_STATE_ERROR
if requestId == int(response['requestId']):
self.requests[requestId]['response'] += response['content']
if response['type'] == FastCGIClient.FCGI_STATE_SUCCESS:
self.requests[requestId]
return self.requests[requestId]['response']
def __repr__(self):
return "fastcgi connect host:{} port:{}".format(self.host, self.port)