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"""
meli - python3 api plugin
Copyright 2019 Manos Pitsidianakis
This file is part of meli.
meli is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
meli is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with meli. If not, see <http://www.gnu.org/licenses/>.
"""
from collections import deque
import errno
import json
import msgpack
import socket
import struct
import sys
import time
class IPCError(Exception):
pass
class UnknownMessageClass(IPCError):
pass
class InvalidSerialization(IPCError):
pass
class ConnectionClosed(IPCError):
pass
def _read_objects(sock):
unpacker = msgpack.Unpacker()
ret = []
#reader = socket.socket.makefile(sock, 'rb')
while True:
try:
buf = sock.recv(1024**2)
if not buf:
break
unpacker.feed(buf)
for o in unpacker:
ret.append(o)
except:
break
return ret
#try:
# for unpack in unpacker:
# return unpack
#except Exception as e:
# print("[libmeliapi]: ", "_read_objects error ", e, file=sys.stderr,)
# return None
#finally:
# reader.flush()
def _write_objects(sock, objects):
sys.stderr.flush()
print("[libmeliapi]: ", "_write_objects ", objects, flush=True, file=sys.stderr, )
data = msgpack.packb(objects)
#print("[libmeliapi]: ", "_write_objects data ", data, flush=True, file=sys.stderr, )
sent = 0
while sent < len(data):
try:
_len = min(len(data[sent:]), 2048)
sent += sock.send(data[sent:sent+_len])
except IOError as e:
print("[libmeliapi]: IOError: ", e, e.errno, flush=True, file=sys.stderr, )
sys.stderr.flush()
if e.errno == errno.EWOULDBLOCK:
break
elif e.errno == errno.EAGAIN:
time.sleep(0.001)
continue
else:
raise
class Client(object):
def __init__(self, server_address):
self.buffer = deque()
self.addr = server_address
address_family = socket.AF_UNIX
self.sock = socket.socket(address_family, socket.SOCK_STREAM)
self.sock.setblocking(0)
def connect(self):
try:
self.sock.connect(self.addr)
print("[libmeliapi]: ", "self.send({ \"version\": \"dev\" }) = ",self.send({ "version": "dev" }), flush=True, file=sys.stderr)
self.expect_ack()
self._session = self.read()
self.ack()
print("[libmeliapi]: ", "self.buffer =", self.buffer, flush=True, file=sys.stderr, )
print("[libmeliapi]: ", "connected, session id is", self._session, flush=True, file=sys.stderr)
except socket.error as msg:
print("[libmeliapi]: ", msg, flush=True, file=sys.stderr, )
sys.stderr.flush()
sys.exit(1)
def close(self):
self.sock.close()
def setblocking(self, new_val):
self.sock.setblocking(new_val)
def __enter__(self):
self.connect()
return self
def __exit__(self, exc_type, exc_value, traceback):
self.close()
def send(self, objects):
sys.stderr.flush()
#print("[libmeliapi]: ", "stuck in send ", self.buffer, flush=True, file=sys.stderr, )
_write_objects(self.sock, objects)
#print("[libmeliapi]: ", "unstuck wrote objs", flush=True, file=sys.stderr, )
#print("[libmeliapi]: ", "wrote object ", objects, file=sys.stderr)
time.sleep(0.001)
def ack(self):
sys.stderr.flush()
_write_objects(self.sock, 0x06)
time.sleep(0.001)
def expect_ack(self):
#print("[libmeliapi]: expect_ack, ", self.buffer, flush=True, file=sys.stderr, )
while True:
time.sleep(0.1)
read_list = _read_objects(self.sock)
self.buffer.extend(read_list)
try:
self.buffer.remove(0x6)
#print("[libmeliapi]: got_ack, ", self.buffer, flush=True, file=sys.stderr, )
return
except ValueError:
pass
def read(self):
sys.stderr.flush()
#print("[libmeliapi]: ", "stuck in read ", self.buffer, flush=True, file=sys.stderr, )
read_list = _read_objects(self.sock)
time.sleep(0.01)
self.buffer.extend(read_list)
#print("[libmeliapi]: ", "unstuck read self.buffer =", self.buffer, flush=True, file=sys.stderr, )
if len(self.buffer) > 0:
return self.buffer.popleft()
else:
return None
@property
def backend_fn_type(self):
return 0
@property
def backend_op_fn_type(self):
return 1
def ok_send(self, objects):
self.send({"t": "ok", "c": objects })
self.expect_ack()
def err_send(self, objects):
self.send({"t": "err", "c": objects })
self.expect_ack()