CERL: PHP或Python调用C++实现的服务器

kaywang

　　周末2天，一天写了个php_cerl模块，完成cerl的php client，一天写了个pycerl模块，完成cerl的python client。呵呵，C++的server可以用php或者python来调用了。
　　对于我们之前用CERL写的HashServer这个服务器（一个很简单的样例，代码参阅：Erlang vs. CERL - CERL简介），其PHP写的Client样例如下：
　　<?phpdefine('HashSever_put', 1);define('HashSever_get', 2);if (!extension_loaded('php_cerl')) {if (!dl('php_cerl.' . PHP_SHLIB_SUFFIX))die("ERROR: Cannot load php_cerl library!\n");}cerl_thread_init();$server = cerl_connect('localhost:8889', 'HashServer');if (!$server)die("ERROR: Connect HashSever failed!\n");printf("+-----------------------------------------------------------\n" ."| put <key> <value> - Put (key, value)\n" ."| get <key> - Get value of a key\n" ."| q - Quit\n" ."+-----------------------------------------------------------\n");for (;;){echo "\n> ";list($cmd, $key, $value) = fscanf(STDIN, '%s%d%d');if ($cmd == 'get' || $cmd == 'g'){$ret = $server->call(HashSever_get, $key);if ($ret[0] == code_ok)echo "result: $ret[1]\n";elseecho "error: $ret[0]\n";}else if ($cmd == 'put' || $cmd == 'p'){$ret = $server->call(HashSever_put, $key, $value);if ($ret[0] == code_ok)echo "ok!\n";elseecho "error: $ret[0]\n";}else if ($cmd == 'q'){break;}else{echo "unknown command!\n";}}cerl_thread_term();?>
　　而Python写的Client样例如下：
　　HashSever_put = 1HashSever_get = 2import sys, pycerlpycerl.thread_init()server = pycerl.connect("localhost:8889", "HashServer")if not server:print "ERROR: Connect HashSever failed!"else:print "+-----------------------------------------------------------"print "| put <key> <value> - Put (key, value)"print "| get <key> - Get value of a key"print "| q - Quit"print "+-----------------------------------------------------------"while True:sys.stdout.write("\n> ")input = sys.stdin.readline().split()cmd = input[0]if cmd == "get" or cmd == "g":if len(input) < 2:continuekey = int(input[1], 10)ret = server.call(HashSever_get, key)if ret[0] == pycerl.code_ok:print "result:", ret[1]else:print "error:", ret[0]elif cmd == "put" or cmd == "p":if len(input) < 3:continuekey = int(input[1], 10)value = int(input[2], 10)ret = server.call(HashSever_put, key, value)if ret[0] == pycerl.code_ok:print "ok!"else:print "error:", ret[0]elif cmd == "q":breakelse:print "unknown command!"pycerl.thread_term()
　　值得注意的是，这里我们没有像C/C++一样，用一个编译器为SDL翻译生成PHP/Python的Proxy代码。这是动态语言的优势，哪怕没有Proxy，其代码仍然看起来相当优雅（不过话又说回来，其实C++也可以做到的，但是略损失些性能）。