acl/lib_acl_cpp/samples/aio/aio_connect/main.cpp

#include <iostream>
#include <assert.h>
#include "lib_acl.h"
#include "acl_cpp/acl_cpp_init.hpp"
#include "acl_cpp/stdlib/string.hpp"
#include "acl_cpp/stdlib/util.hpp"
#include "acl_cpp/stream/aio_handle.hpp"
#include "acl_cpp/stream/aio_socket_stream.hpp"

#ifdef WIN32
# ifndef snprintf
#  define snprintf _snprintf
# endif
#endif

typedef struct
{
	acl::aio_handle* handle;
	char  addr[64];
	int   connect_timeout;
	int   read_timeout;
	int   nopen_limit;
	int   nopen_total;
	int   nwrite_limit;
	int   nwrite_total;
	int   nread_total;
	int   id_begin;
} IO_CTX;

static bool connect_server(IO_CTX* ctx, int id);

/**
 * 客户端异步连接流回调函数类
 */
class client_io_callback : public acl::aio_open_callback
{
public:
	/**
	 * 构造函数
	 * @param ctx {IO_CTX*}
	 * @param client {aio_socket_stream*} 异步连接流
	 * @param id {int} 本流的ID号
	 */
	client_io_callback(IO_CTX* ctx, acl::aio_socket_stream* client, int id)
	: client_(client)
	, ctx_(ctx)
	, nwrite_(0)
	, id_(id) {}

	~client_io_callback(void)
	{
		std::cout << ">>>ID: " << id_
			<< ", io_callback deleted now!" << std::endl;
	}

	/**
	 * 基类虚函数, 当异步流读到所要求的数据时调用此回调函数
	 * @param data {char*} 读到的数据地址
	 * @param len {int｝ 读到的数据长度
	 * @return {bool} 返回给调用者 true 表示继续，否则表示需要关闭异步流
	 */
	bool read_callback(char* data, int)
	{
		if (strncasecmp(data, "+OK", 3) != 0) {
			std::cout << "gets error: " << data << std::endl;
			return false;
		} else {
			std::cout << "OK: " << data << std::endl;
		}
		return true;
	}

	/**
	 * 基类虚函数, 当异步流写成功时调用此回调函数
	 * @return {bool} 返回给调用者 true 表示继续，否则表示需要关闭异步流
	 */
	bool write_callback(void)
	{
		return true;
	}

	/**
	 * 基类虚函数, 当该异步流关闭时调用此回调函数
	 */
	void close_callback(void)
	{
		if (!client_->is_opened()) {
			std::cout << "Id: " << id_ << " connect "
				<< ctx_->addr << " error: "
				<< acl::last_serror();

			// 如果是第一次连接就失败，则退出
			if (ctx_->nopen_total == 0) {
				std::cout << ", first connect error, quit";
				/* 获得异步引擎句柄，并设置为退出状态 */
				client_->get_handle().stop();
			}
			std::cout << std::endl;
			delete this;
			return;
		}

		std::cout << "close now, nleft: " << ctx_->nopen_total
			<< std::endl;

		/* 获得异步引擎中受监控的异步流个数 */
		int nleft = client_->get_handle().length();
		if (ctx_->nopen_total == ctx_->nopen_limit && nleft == 1) {
			std::cout << "Id: " << id_ << " stop now! nstream: "
				<< nleft << std::endl;
			/* 获得异步引擎句柄，并设置为退出状态 */
			client_->get_handle().stop();
		}

		// 必须在此处删除该动态分配的回调类对象以防止内存泄露
		delete this;
	}

	/**
	 * 基类虚函数，当异步流超时时调用此函数
	 * @return {bool} 返回给调用者 true 表示继续，否则表示需要关闭异步流
	 */
	bool timeout_callback(void)
	{
		std::cout << "Connect " << ctx_->addr
			<< " Timeout ..." << std::endl;
		client_->close();
		return false;
	}

	/**
	 * 基类虚函数, 当异步连接成功后调用此函数
	 * @return {bool} 返回给调用者 true 表示继续，否则表示需要关闭异步流
	 */
	bool open_callback(void)
	{
		// 连接成功，设置IO读写回调函数
		client_->add_read_callback(this);
		client_->add_write_callback(this);
		ctx_->nopen_total++;

		std::cout << "opend ok, nopen: " << ctx_->nopen_total
			<< std::endl;

		acl::assert_(id_ > 0);
		if (ctx_->nopen_total < ctx_->nopen_limit) {
			// 开始进行下一个连接过程
			if (!connect_server(ctx_, id_ + 1)) {
				std::cout << "connect error!"
					<< acl::last_serror() << std::endl;
			}
		}

		// 异步从服务器读取一行数据
		client_->gets(ctx_->read_timeout, false);

		// 表示继续异步过程
		return true;
	}

private:
	acl::aio_socket_stream* client_;
	IO_CTX* ctx_;
	int     nwrite_;
	int     id_;
};

static bool connect_server(IO_CTX* ctx, int id)
{
	// 开始异步连接远程服务器
	acl::aio_socket_stream* stream = acl::aio_socket_stream::open
		(ctx->handle, ctx->addr, ctx->connect_timeout);
	if (stream == NULL) {
		std::cout << "connect " << ctx->addr << " error!" << std::endl;
		std::cout << "stoping ..." << std::endl;
		if (id == 0) {
			ctx->handle->stop();
		}
		return false;
	}

	ACL_VSTREAM *fp = stream->get_vstream();
	acl_tcp_so_linger(ACL_VSTREAM_SOCK(fp), 1, 0);

	// 创建连接后的回调函数类
	client_io_callback* callback = new client_io_callback(ctx, stream, id);

	// 添加连接成功的回调函数类
	stream->add_open_callback(callback);

	// 添加连接失败后回调函数类
	stream->add_close_callback(callback);

	// 添加连接超时的回调函数类
	stream->add_timeout_callback(callback);
	return true;
}

static void usage(const char* procname)
{
	printf("usage: %s -h[help] -l server_addr -c nconnect"
		" -n io_max -k[use kernel event: epoll/kqueue/devpoll"
		" -t connect_timeout\n", procname);
}

int main(int argc, char* argv[])
{
	bool use_kernel = false;
	int   ch;
	IO_CTX ctx;

	memset(&ctx, 0, sizeof(ctx));
	ctx.connect_timeout = 5;
	ctx.nopen_limit     = 10;
	ctx.id_begin        = 1;
	ctx.nwrite_limit    = 10;
	snprintf(ctx.addr, sizeof(ctx.addr), "127.0.0.1:9001");

	while ((ch = getopt(argc, argv, "hc:n:kl:t:")) > 0) {
		switch (ch) {
		case 'c':
			ctx.nopen_limit = atoi(optarg);
			if (ctx.nopen_limit <= 0) {
				ctx.nopen_limit = 10;
			}
			break;
		case 'n':
			ctx.nwrite_limit = atoi(optarg);
			if (ctx.nwrite_limit <= 0)
				ctx.nwrite_limit = 10;
			break;
		case 'h':
			usage(argv[0]);
			return 0;
		case 'k':
			use_kernel = true;
			break;
		case 'l':
			snprintf(ctx.addr, sizeof(ctx.addr), "%s", optarg);
			break;
		case 't':
			ctx.connect_timeout = atoi(optarg);
			break;
		default:
			break;
		}
	}

	acl::meter_time(__FUNCTION__, __LINE__, "-----BEGIN-----");
	acl::acl_cpp_init();

	acl::aio_handle handle(use_kernel ? acl::ENGINE_KERNEL : acl::ENGINE_SELECT);
	ctx.handle = &handle;

	if (!connect_server(&ctx, ctx.id_begin)) {
		std::cout << "enter any key to exit." << std::endl;
		getchar();
		return 1;
	}

	std::cout << "Connect " << ctx.addr << " ..." << std::endl;

	while (true) {
		// 如果返回 false 则表示不再继续，需要退出
		if (!handle.check()) {
			break;
		}
	}

	acl::string buf;

	buf << "total open: " << ctx.nopen_total
		<< ", total write: " << ctx.nwrite_total
		<< ", total read: " << ctx.nread_total;

	acl::meter_time(__FUNCTION__, __LINE__, buf.c_str());

	return 0;
}