| 1 | # |
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| 2 | # Copyright (C) 2020 Soleta Networks <info@soleta.eu> |
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| 3 | # |
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| 4 | # This program is free software: you can redistribute it and/or modify it under |
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| 5 | # the terms of the GNU Affero General Public License as published by the |
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| 6 | # Free Software Foundation, version 3. |
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| 7 | # |
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| 8 | |
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| 9 | import errno |
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| 10 | import select |
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| 11 | import socket |
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| 12 | import time |
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| 13 | import email |
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| 14 | import platform |
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| 15 | from io import StringIO |
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| 16 | |
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| 17 | from src.restRequest import * |
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| 18 | from src.ogRest import * |
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| 19 | from enum import Enum |
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| 20 | |
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| 21 | class State(Enum): |
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| 22 | CONNECTING = 0 |
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| 23 | RECEIVING = 1 |
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| 24 | FORCE_DISCONNECTED = 2 |
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| 25 | |
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| 26 | class ogClient: |
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| 27 | OG_PATH = '/opt/opengnsys/' |
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| 28 | |
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| 29 | def __init__(self, config): |
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| 30 | self.CONFIG = config |
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| 31 | |
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| 32 | self.mode = self.CONFIG['opengnsys']['mode'] |
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| 33 | if self.mode not in {'virtual', 'live'}: |
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| 34 | raise ValueError('Mode not supported.') |
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| 35 | |
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| 36 | if self.CONFIG['samba']['activate']: |
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| 37 | assert('user' in self.CONFIG['samba']) |
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| 38 | assert('pass' in self.CONFIG['samba']) |
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| 39 | |
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| 40 | self.ip = self.CONFIG['opengnsys']['ip'] |
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| 41 | self.port = self.CONFIG['opengnsys']['port'] |
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| 42 | self.ogrest = ogRest(self.CONFIG) |
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| 43 | |
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| 44 | def get_socket(self): |
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| 45 | return self.sock |
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| 46 | |
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| 47 | def get_state(self): |
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| 48 | return self.state |
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| 49 | |
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| 50 | def connect(self): |
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| 51 | print('connecting...') |
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| 52 | self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
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| 53 | self.sock.setblocking(0) |
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| 54 | self.state = State.CONNECTING |
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| 55 | self.data = "" |
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| 56 | self.trailer = False |
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| 57 | self.content_len = 0 |
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| 58 | |
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| 59 | try: |
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| 60 | self.sock.connect((self.ip, self.port)) |
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| 61 | except socket.error as err: |
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| 62 | if err.errno == errno.EINPROGRESS: |
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| 63 | return |
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| 64 | elif err.errno == errno.ECONNREFUSED: |
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| 65 | return |
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| 66 | |
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| 67 | def send(self, msg): |
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| 68 | self.sock.send(bytes(msg, 'utf-8')) |
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| 69 | return len(msg) |
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| 70 | |
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| 71 | def connect2(self): |
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| 72 | try: |
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| 73 | self.sock.connect((self.ip, self.port)) |
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| 74 | except socket.error as err: |
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| 75 | if err.errno == errno.EISCONN: |
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| 76 | print('connected') |
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| 77 | self.state = State.RECEIVING |
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| 78 | else: |
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| 79 | time.sleep(1) |
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| 80 | print('connection refused, retrying...') |
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| 81 | self.state = State.CONNECTING |
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| 82 | self.sock.close() |
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| 83 | self.connect() |
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| 84 | |
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| 85 | def receive(self): |
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| 86 | try: |
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| 87 | data = self.sock.recv(1024).decode('utf-8') |
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| 88 | except socket.error as err: |
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| 89 | data = '' |
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| 90 | print('failed to received ' + str(err)) |
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| 91 | |
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| 92 | if len(data) == 0: |
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| 93 | self.state = State.CONNECTING |
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| 94 | self.sock.close() |
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| 95 | self.connect() |
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| 96 | |
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| 97 | self.data = self.data + data |
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| 98 | request = restRequest() |
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| 99 | |
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| 100 | if not self.trailer: |
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| 101 | if self.data.find("\r\n") > 0: |
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| 102 | # https://stackoverflow.com/questions/4685217/parse-raw-http-headers |
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| 103 | request_line, headers_alone = self.data.split('\n', 1) |
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| 104 | headers = email.message_from_file(StringIO(headers_alone)) |
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| 105 | |
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| 106 | if 'content-length' in headers.keys(): |
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| 107 | self.content_len = int(headers['content-length']) |
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| 108 | |
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| 109 | self.trailer = True |
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| 110 | |
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| 111 | if self.trailer and len(self.data) >= self.content_len: |
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| 112 | request.parser(self.data) |
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| 113 | self.ogrest.process_request(request, self) |
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| 114 | |
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| 115 | # Cleanup state information from request |
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| 116 | self.data = "" |
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| 117 | self.content_len = 0 |
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| 118 | self.trailer = False |
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| 119 | |
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| 120 | def disconnect(self): |
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| 121 | self.state = State.FORCE_DISCONNECTED |
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| 122 | self.sock.shutdown(socket.SHUT_RDWR) |
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| 123 | self.sock.close() |
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| 124 | |
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| 125 | def run(self): |
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| 126 | while 1: |
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| 127 | sock = self.get_socket() |
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| 128 | state = self.get_state() |
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| 129 | |
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| 130 | if state == State.CONNECTING: |
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| 131 | readset = [ sock ] |
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| 132 | writeset = [ sock ] |
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| 133 | elif state == State.FORCE_DISCONNECTED: |
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| 134 | return 0 |
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| 135 | else: |
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| 136 | readset = [ sock ] |
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| 137 | writeset = [ ] |
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| 138 | |
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| 139 | readable, writable, exception = select.select(readset, writeset, [ ]) |
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| 140 | if state == State.CONNECTING and sock in writable: |
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| 141 | self.connect2() |
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| 142 | elif state == State.RECEIVING and sock in readable: |
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| 143 | self.receive() |
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| 144 | else: |
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| 145 | print('wrong state, not ever happen!' + str(state)) |
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