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#
# Copyright (C) 2020 Soleta Networks <info@soleta.eu>
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the
# Free Software Foundation, version 3.
#
import errno
import select
import socket
import time
import email
import platform
from io import StringIO
from src.restRequest import *
from src.ogRest import *
from enum import Enum
class State(Enum):
CONNECTING = 0
RECEIVING = 1
FORCE_DISCONNECTED = 2
class ogClient:
def __init__(self, config):
self.CONFIG = config
self.mode = self.CONFIG['opengnsys']['mode']
if self.mode not in {'virtual', 'linux'}:
raise ValueError('Mode not supported.')
if self.mode == 'linux' and platform.system() != 'Linux':
raise ValueError('Linux mode not supported on '
'non-Linux platform.')
if self.CONFIG['samba']['activate']:
assert('user' in self.CONFIG['samba'])
assert('pass' in self.CONFIG['samba'])
self.ip = self.CONFIG['opengnsys']['ip']
self.port = self.CONFIG['opengnsys']['port']
self.ogrest = ogRest(self.CONFIG)
def get_socket(self):
return self.sock
def get_state(self):
return self.state
def connect(self):
print('connecting...')
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.sock.setblocking(0)
self.state = State.CONNECTING
self.data = ""
self.trailer = False
self.content_len = 0
try:
self.sock.connect((self.ip, self.port))
except socket.error as err:
if err.errno == errno.EINPROGRESS:
return
elif err.errno == errno.ECONNREFUSED:
return
def send(self, msg):
self.sock.send(bytes(msg, 'utf-8'))
return len(msg)
def connect2(self):
try:
self.sock.connect((self.ip, self.port))
except socket.error as err:
if err.errno == errno.EISCONN:
print('connected')
self.state = State.RECEIVING
else:
time.sleep(1)
print('connection refused, retrying...')
self.state = State.CONNECTING
self.sock.close()
self.connect()
def receive(self):
try:
data = self.sock.recv(1024).decode('utf-8')
except socket.error as err:
data = ''
print('failed to received ' + str(err))
if len(data) == 0:
self.state = State.CONNECTING
self.sock.close()
self.connect()
self.data = self.data + data
request = restRequest()
if not self.trailer:
if self.data.find("\r\n") > 0:
# https://stackoverflow.com/questions/4685217/parse-raw-http-headers
request_line, headers_alone = self.data.split('\n', 1)
headers = email.message_from_file(StringIO(headers_alone))
if 'content-length' in headers.keys():
self.content_len = int(headers['content-length'])
self.trailer = True
if self.trailer and len(self.data) >= self.content_len:
request.parser(self.data)
self.ogrest.process_request(request, self)
# Cleanup state information from request
self.data = ""
self.content_len = 0
self.trailer = False
def disconnect(self):
self.state = State.FORCE_DISCONNECTED
self.sock.close()
def run(self):
while 1:
sock = self.get_socket()
state = self.get_state()
if state == State.CONNECTING:
readset = [ sock ]
writeset = [ sock ]
elif state == State.FORCE_DISCONNECTED:
return 0
else:
readset = [ sock ]
writeset = [ ]
readable, writable, exception = select.select(readset, writeset, [ ])
if state == State.CONNECTING and sock in writable:
self.connect2()
elif state == State.RECEIVING and sock in readable:
self.receive()
else:
print('wrong state, not ever happen!' + str(state))
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