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|
"""
This module provides more sophisticated flow tracking. These match requests
with their responses, and provide filtering and interception facilities.
"""
import proxy, threading
class ReplayConnection:
pass
class ReplayThread(threading.Thread):
def __init__(self, flow, masterq):
self.flow, self.masterq = flow, masterq
threading.Thread.__init__(self)
def run(self):
try:
server = proxy.ServerConnection(self.flow.request)
response = server.read_response()
response.send(self.masterq)
except proxy.ProxyError, v:
err = proxy.Error(self.flow.connection, v.msg)
err.send(self.masterq)
class Flow:
def __init__(self, connection):
self.connection = connection
self.request, self.response, self.error = None, None, None
self.waiting = True
self.intercepting = False
self._backup = None
def backup(self):
if not self._backup:
self._backup = [
self.connection.copy() if self.connection else None,
self.request.copy() if self.request else None,
self.response.copy() if self.response else None,
self.error.copy() if self.error else None,
]
def revert(self):
if self._backup:
self.waiting = False
restore = [i.copy() if i else None for i in self._backup]
self.connection, self.request, self.response, self.error = restore
def match(self, pattern):
if pattern:
if self.response:
return pattern(self.response)
elif self.request:
return pattern(self.request)
return False
def is_replay(self):
return isinstance(self.connection, ReplayConnection)
def kill(self):
if self.intercepting:
if not self.request.acked:
self.request.kill = True
self.request.ack()
elif self.response and not self.response.acked:
self.response.kill = True
self.response.ack()
self.intercepting = False
def intercept(self):
self.intercepting = True
def accept_intercept(self):
if self.request:
if not self.request.acked:
self.request.ack()
elif self.response and not self.response.acked:
self.response.ack()
self.intercepting = False
class State:
def __init__(self):
self.flow_map = {}
self.flow_list = []
# These are compiled filt expressions:
self.limit = None
self.intercept = None
def add_browserconnect(self, f):
"""
Start a browser connection.
"""
self.flow_list.insert(0, f)
self.flow_map[f.connection] = f
def add_request(self, req):
"""
Add a request to the state. Returns the matching flow.
"""
f = self.flow_map.get(req.connection)
if not f:
return False
f.request = req
return f
def add_response(self, resp):
"""
Add a response to the state. Returns the matching flow.
"""
f = self.flow_map.get(resp.request.connection)
if not f:
return False
f.response = resp
f.waiting = False
f.backup()
return f
def add_error(self, err):
"""
Add an error response to the state. Returns the matching flow, or
None if there isn't one.
"""
f = self.flow_map.get(err.connection)
if not f:
return None
f.error = err
f.waiting = False
f.backup()
return f
def set_limit(self, limit):
"""
Limit is a compiled filter expression, or None.
"""
self.limit = limit
def get_connection(self, itm):
if isinstance(itm, (proxy.BrowserConnection, ReplayConnection)):
return itm
elif hasattr(itm, "connection"):
return itm.connection
elif hasattr(itm, "request"):
return itm.request.connection
def lookup(self, itm):
"""
Checks for matching connection, using a Flow, Replay Connection,
BrowserConnection, Request, Response or Error object. Returns None
if not found.
"""
connection = self.get_connection(itm)
return self.flow_map.get(connection)
def delete_flow(self, f):
if not f.intercepting:
c = self.get_connection(f)
del self.flow_map[c]
self.flow_list.remove(f)
return True
return False
def clear(self):
for i in self.flow_list[:]:
self.delete_flow(i)
def accept_all(self):
for i in self.flow_list[:]:
i.accept_intercept()
def kill_flow(self, f):
f.kill()
self.delete_flow(f)
def revert(self, f):
"""
Replaces the matching connection object with a ReplayConnection object.
"""
conn = self.get_connection(f)
del self.flow_map[conn]
f.revert()
self.flow_map[f.connection] = f
def replay(self, f, masterq):
"""
Replaces the matching connection object with a ReplayConnection object.
Returns None if successful, or error message if not.
"""
#begin nocover
if f.intercepting:
return "Can't replay while intercepting..."
if f.request:
f.backup()
conn = self.get_connection(f)
del self.flow_map[conn]
rp = ReplayConnection()
f.connection = rp
f.request.connection = rp
if f.request.content:
f.request.headers["content-length"] = [str(len(f.request.content))]
f.response = None
f.error = None
self.flow_map[rp] = f
rt = ReplayThread(f, masterq)
rt.start()
#end nocover
|
