# -*- coding: utf-8 -*- # Copyright (C) 2016 Alex Yatskov # Author: Alex Yatskov # # This program 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. # # This program 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 this program. If not, see . import json import select import socket class AjaxRequest: def __init__(self, headers, body): self.headers = headers self.body = body class AjaxClient: def __init__(self, sock, handler): self.sock = sock self.handler = handler self.readBuff = '' self.writeBuff = '' def advance(self, recvSize=1024): if self.sock is None: return False rlist, wlist = select.select([self.sock], [self.sock], [], 0)[:2] if rlist: msg = self.sock.recv(recvSize) if not msg: self.close() return False self.readBuff += msg req, length = self.parseRequest(self.readBuff) if req is not None: self.readBuff = self.readBuff[length:] self.writeBuff += self.handler(req) if wlist and self.writeBuff: length = self.sock.send(self.writeBuff) self.writeBuff = self.writeBuff[length:] if not self.writeBuff: self.close() return False return True def close(self): if self.sock is not None: self.sock.close() self.sock = None self.readBuff = '' self.writeBuff = '' def parseRequest(self, data): parts = data.split('\r\n\r\n', 1) if len(parts) == 1: return None, 0 headers = {} for line in parts[0].split('\r\n'): pair = line.split(': ') headers[pair[0]] = pair[1] if len(pair) > 1 else None headerLength = len(parts[0]) + 4 bodyLength = int(headers['Content-Length']) totalLength = headerLength + bodyLength if totalLength > len(data): return None, 0 body = data[headerLength : totalLength] return AjaxRequest(headers, body), totalLength class AjaxServer: def __init__(self, handler): self.handler = handler self.clients = [] self.sock = None def advance(self): if self.sock is not None: self.acceptClients() self.advanceClients() def acceptClients(self): rlist = select.select([self.sock], [], [], 0)[0] if not rlist: return clientSock = self.sock.accept()[0] if clientSock is not None: clientSock.setblocking(False) self.clients.append(AjaxClient(clientSock, self.handlerWrapper)) def advanceClients(self): self.clients = filter(lambda c: c.advance(), self.clients) def listen(self, address='127.0.0.1', port=8888, backlog=5): self.close() self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) self.sock.setblocking(False) self.sock.bind((address, port)) self.sock.listen(backlog) def handlerWrapper(self, req): body = json.dumps(self.handler(json.loads(req.body))) resp = '' headers = { 'HTTP/1.1 200 OK': None, 'Content-Type': 'application/json', 'Content-Length': str(len(body)), 'Access-Control-Allow-Origin': '*' } for key, value in headers.items(): if value is None: resp += '{}\r\n'.format(key) else: resp += '{}: {}\r\n'.format(key, value) resp += '\r\n' resp += body return resp def close(self): if self.sock is not None: self.sock.close() self.sock = None for client in self.clients: client.close() self.clients = []