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server.c
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server.c
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#include "server.h"
#include "buffer.h"
#include "protocol.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
client_t *alloc_client()
{
client_t * client = zmalloc(sizeof(client_t));
if (client == NULL) {
goto err;
}
client->loop = NULL;
client->fd = -1;
client->read_buffer = alloc_buffer();
client->write_buffer = alloc_buffer();
if (client->read_buffer == NULL || client->write_buffer == NULL) {
goto err;
}
return client;
err:
if (client) {
zfree(client->read_buffer);
zfree(client->write_buffer);
zfree(client);
}
return NULL;
}
void free_client(client_t *client)
{
if (client) {
if (client->fd > 0) {
aeDeleteFileEvent(client->loop, client->fd, AE_READABLE);
aeDeleteFileEvent(client->loop, client->fd, AE_WRITABLE);
close(client->fd);
}
zfree(client->read_buffer);
zfree(client->write_buffer);
zfree(client);
}
}
static int serverCron(struct aeEventLoop *loop, long long id, void *data)
{
static int count = 1;
printf("timeout, No.%d\n", count);
if (++count > 3) {
printf("exit now...");
aeStop(loop);
}
return 1000;
}
static void writeEventHandler(aeEventLoop *loop, int fd, void *data, int mask)
{
client_t *client = (client_t *)data;
buffer_t *wbuffer = client->write_buffer;
int data_size = (int)get_readable_size(wbuffer);
if (data_size == 0) {
aeDeleteFileEvent(client->loop, client->fd, AE_WRITABLE);
return;
}
int writen = anetWrite(client->fd, (char *)wbuffer->buff + wbuffer->read_idx, data_size);
if (writen > 0) {
wbuffer->read_idx += writen;
}
if (get_readable_size(wbuffer) == 0) {
aeDeleteFileEvent(client->loop, client->fd, AE_WRITABLE);
}
}
static void readEventHandler(aeEventLoop *loop, int fd, void *data, int mask)
{
client_t *client = (client_t *)data;
buffer_t *rbuffer = client->read_buffer;
check_buffer_size(rbuffer, DEFAULT_BUFF_SIZE / 2);
size_t avlid_size = rbuffer->size - rbuffer->write_idx;
ssize_t readn = read(fd, rbuffer->buff + rbuffer->write_idx, avlid_size);
if (readn > 0) {
rbuffer->write_idx += readn;
package_t *req_package = NULL;
while (1) {
int decode_ret = packet_decode(rbuffer, &req_package);
if (decode_ret == 0) {
package_t *resp_package = NULL;
do_package(req_package, &resp_package);
if (resp_package) {
buffer_t *wbuffer = client->write_buffer;
check_buffer_size(wbuffer, sizeof(package_head_t) + resp_package->head.length);
package_encode(wbuffer, resp_package);
int writen = anetWrite(client->fd, (char *)wbuffer->buff + wbuffer->read_idx,
(int)get_readable_size(wbuffer));
if (writen > 0) {
wbuffer->read_idx += writen;
}
if (get_readable_size(wbuffer) != 0) {
if (aeCreateFileEvent(client->loop, client->fd,
AE_WRITABLE, writeEventHandler, client) == AE_ERR) {
printf("create socket writeable event error, close it.");
free_client(client);
}
}
}
zfree(req_package);
zfree(resp_package);
} else if (decode_ret == -1) {
// not enough data
break;
} else if (decode_ret == -2) {
char ip_info[64];
anetFormatPeer(client->fd, ip_info, sizeof(ip_info));
printf("decode error, %s disconnect.\n", ip_info);
// recv wrong data, disconnect
free_client(client);
}
}
} else if (readn == 0) {
printf("client disconnect, close it.\n");
free_client(client);
}
}
static void acceptTcpHandler(aeEventLoop *loop, int fd, void *data, int mask)
{
char cip[64];
int cport;
server_t *server = (server_t *)data;
int cfd = anetTcpAccept(NULL, fd, cip, sizeof(cip), &cport);
if (cfd != -1) {
printf("accepted ip %s:%d\n", cip, cport);
anetNonBlock(NULL, cfd);
anetEnableTcpNoDelay(NULL, cfd);
client_t *client = alloc_client();
if (!client) {
printf("alloc client error...close socket\n");
close(fd);
return;
}
client->loop = loop;
client->fd = cfd;
if (aeCreateFileEvent(loop, cfd, AE_READABLE, readEventHandler, client) == AE_ERR) {
if (errno == ERANGE) {
// or use aeResizeSetSize(server->loop, cfd) modify this limit
printf("so many client, close new.");
} else {
printf("create socket readable event error, close it.");
}
free_client(client);
}
}
}
void init_server(server_t *server)
{
server->loop = aeCreateEventLoop(server->max_client_count);
//aeCreateTimeEvent(loop, 1000, serverCron, NULL, NULL);
server->listen_fd = anetTcpServer(server->err_info, server->port, NULL, server->backlog);
if (server->listen_fd != ANET_ERR) {
anetNonBlock(server->err_info, server->listen_fd);
}
if (aeCreateFileEvent(server->loop, server->listen_fd, AE_READABLE, acceptTcpHandler, server) != AE_ERR) {
char conn_info[64];
anetFormatSock(server->listen_fd, conn_info, sizeof(conn_info));
printf("listen on: %s\n", conn_info);
}
}
void wait_server(server_t *server)
{
aeMain(server->loop);
aeDeleteEventLoop(server->loop);
}
int main()
{
// TODO, use sigaction or signalfd
signal(SIGPIPE, SIG_IGN);
server_t server;
bzero(&server, sizeof(server));
server.backlog = DEFAULT_LISTEN_BACKLOG;
server.max_client_count = DEFAULT_MAX_CLIENT_COUNT;
server.port = DEFAULT_LISTEN_PORT;
init_server(&server);
wait_server(&server);
return 0;
}