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#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
#
import errno
import logging
import os
import socket
import sys
from .TTransport import TTransportBase, TTransportException, TServerTransportBase
logger = logging.getLogger(__name__)
class TSocketBase(TTransportBase):
def _resolveAddr(self):
if self._unix_socket is not None:
return [(socket.AF_UNIX, socket.SOCK_STREAM, None, None,
self._unix_socket)]
else:
return socket.getaddrinfo(self.host,
self.port,
self._socket_family,
socket.SOCK_STREAM,
0,
socket.AI_PASSIVE)
def close(self):
if self.handle:
self.handle.close()
self.handle = None
class TSocket(TSocketBase):
"""Socket implementation of TTransport base."""
def __init__(self, host='localhost', port=9090, unix_socket=None,
socket_family=socket.AF_UNSPEC,
socket_keepalive=False):
"""Initialize a TSocket
@param host(str) The host to connect to.
@param port(int) The (TCP) port to connect to.
@param unix_socket(str) The filename of a unix socket to connect to.
(host and port will be ignored.)
@param socket_family(int) The socket family to use with this socket.
@param socket_keepalive(bool) enable TCP keepalive, default off.
"""
self.host = host
self.port = port
self.handle = None
self._unix_socket = unix_socket
self._timeout = None
self._socket_family = socket_family
self._socket_keepalive = socket_keepalive
def setHandle(self, h):
self.handle = h
def isOpen(self):
if self.handle is None:
return False
# this lets us cheaply see if the other end of the socket is still
# connected. if disconnected, we'll get EOF back (expressed as zero
# bytes of data) otherwise we'll get one byte or an error indicating
# we'd have to block for data.
#
# note that we're not doing this with socket.MSG_DONTWAIT because 1)
# it's linux-specific and 2) gevent-patched sockets hide EAGAIN from us
# when timeout is non-zero.
original_timeout = self.handle.gettimeout()
try:
self.handle.settimeout(0)
try:
peeked_bytes = self.handle.recv(1, socket.MSG_PEEK)
except (socket.error, OSError) as exc: # on modern python this is just BlockingIOError
if exc.errno in (errno.EWOULDBLOCK, errno.EAGAIN):
return True
return False
except ValueError:
# SSLSocket fails on recv with non-zero flags; fallback to the old behavior
return True
finally:
self.handle.settimeout(original_timeout)
# the length will be zero if we got EOF (indicating connection closed)
return len(peeked_bytes) == 1
def setTimeout(self, ms):
if ms is None:
self._timeout = None
else:
self._timeout = ms / 1000.0
if self.handle is not None:
self.handle.settimeout(self._timeout)
def _do_open(self, family, socktype):
return socket.socket(family, socktype)
@property
def _address(self):
return self._unix_socket if self._unix_socket else '%s:%d' % (self.host, self.port)
def open(self):
if self.handle:
raise TTransportException(type=TTransportException.ALREADY_OPEN, message="already open")
try:
addrs = self._resolveAddr()
except socket.gaierror as gai:
msg = 'failed to resolve sockaddr for ' + str(self._address)
logger.exception(msg)
raise TTransportException(type=TTransportException.NOT_OPEN, message=msg, inner=gai)
for family, socktype, _, _, sockaddr in addrs:
handle = self._do_open(family, socktype)
# TCP keep-alive
if self._socket_keepalive:
handle.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
handle.settimeout(self._timeout)
try:
handle.connect(sockaddr)
self.handle = handle
return
except socket.error:
handle.close()
logger.info('Could not connect to %s', sockaddr, exc_info=True)
msg = 'Could not connect to any of %s' % list(map(lambda a: a[4],
addrs))
logger.error(msg)
raise TTransportException(type=TTransportException.NOT_OPEN, message=msg)
def read(self, sz):
try:
buff = self.handle.recv(sz)
except socket.error as e:
if (e.args[0] == errno.ECONNRESET and
(sys.platform == 'darwin' or sys.platform.startswith('freebsd'))):
# freebsd and Mach don't follow POSIX semantic of recv
# and fail with ECONNRESET if peer performed shutdown.
# See corresponding comment and code in TSocket::read()
# in lib/cpp/src/transport/TSocket.cpp.
self.close()
# Trigger the check to raise the END_OF_FILE exception below.
buff = ''
elif e.args[0] == errno.ETIMEDOUT:
raise TTransportException(type=TTransportException.TIMED_OUT, message="read timeout", inner=e)
else:
raise TTransportException(message="unexpected exception", inner=e)
if len(buff) == 0:
raise TTransportException(type=TTransportException.END_OF_FILE,
message='TSocket read 0 bytes')
return buff
def write(self, buff):
if not self.handle:
raise TTransportException(type=TTransportException.NOT_OPEN,
message='Transport not open')
sent = 0
have = len(buff)
while sent < have:
try:
plus = self.handle.send(buff)
if plus == 0:
raise TTransportException(type=TTransportException.END_OF_FILE,
message='TSocket sent 0 bytes')
sent += plus
buff = buff[plus:]
except socket.error as e:
raise TTransportException(message="unexpected exception", inner=e)
def flush(self):
pass
class TServerSocket(TSocketBase, TServerTransportBase):
"""Socket implementation of TServerTransport base."""
def __init__(self, host=None, port=9090, unix_socket=None, socket_family=socket.AF_UNSPEC):
self.host = host
self.port = port
self._unix_socket = unix_socket
self._socket_family = socket_family
self.handle = None
self._backlog = 128
def setBacklog(self, backlog=None):
if not self.handle:
self._backlog = backlog
else:
# We cann't update backlog when it is already listening, since the
# handle has been created.
logger.warn('You have to set backlog before listen.')
def listen(self):
res0 = self._resolveAddr()
socket_family = self._socket_family == socket.AF_UNSPEC and socket.AF_INET6 or self._socket_family
for res in res0:
if res[0] is socket_family or res is res0[-1]:
break
# We need remove the old unix socket if the file exists and
# nobody is listening on it.
if self._unix_socket:
tmp = socket.socket(res[0], res[1])
try:
tmp.connect(res[4])
except socket.error as err:
eno, message = err.args
if eno == errno.ECONNREFUSED:
os.unlink(res[4])
self.handle = s = socket.socket(res[0], res[1])
if s.family is socket.AF_INET6:
s.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 0)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
if hasattr(s, 'settimeout'):
s.settimeout(None)
s.bind(res[4])
s.listen(self._backlog)
def accept(self):
client, addr = self.handle.accept()
result = TSocket()
result.setHandle(client)
return result
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