mirror of
https://gitee.com/acl-dev/acl.git
synced 2024-12-16 01:40:52 +08:00
290 lines
8.1 KiB
C
290 lines
8.1 KiB
C
#include "lib_acl.h"
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#include "conn_cache.h"
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#include "sys_patch.h"
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#include "service.h"
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#ifdef ACL_BCB_COMPILER
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#pragma hdrstop
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#endif
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static int connect_close_callback(ACL_ASTREAM *astream, void *context);
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static int connect_timeout_callback(ACL_ASTREAM *astream, void *context);
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static int connect_callback(ACL_ASTREAM *server, void *context);
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void forward_complete(CLIENT_ENTRY *entry)
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{
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if (entry->server) {
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acl_aio_iocp_close(entry->server);
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}
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if (entry->client) {
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acl_aio_iocp_close(entry->client);
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}
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}
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/* 尝试从连接池中获得一个连接流 */
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static ACL_ASTREAM *peek_server_conn(CLIENT_ENTRY *entry)
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{
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ACL_ASTREAM *stream;
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char addr[64];
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int i;
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if (entry->service->conn_cache == NULL)
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return (NULL);
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for (i = entry->ip_idx; i < entry->dns_ctx.ip_cnt; i++) {
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snprintf(addr, sizeof(addr), "%s:%d", entry->dns_ctx.ip[i],
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entry->dns_ctx.port[i] > 0
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? entry->dns_ctx.port[i] : entry->server_port);
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stream = conn_cache_get_stream(entry->service->conn_cache, addr, NULL);
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if (stream != NULL)
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return (stream);
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}
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return (NULL);
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}
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/* 取得某域名的下一个服务器 IP:PORT 地址 */
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static const char *next_server_addr(CLIENT_ENTRY *entry, char *buf, size_t size)
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{
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const char *myname = "next_server_addr";
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SERVICE *service = entry->service;
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int i;
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/* 试着多连一次 */
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if (entry->ip_ntry++ > entry->dns_ctx.ip_cnt) {
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acl_msg_error("%s(%d): domain(%s), ip_ntry(%d) >= ip_cnt(%d)",
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myname, __LINE__, entry->domain_key,
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entry->ip_ntry, entry->dns_ctx.ip_cnt);
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return (NULL);
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}
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if (entry->ip_idx == entry->dns_ctx.ip_cnt)
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entry->ip_idx = 0;
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for (i = entry->ip_idx; i < entry->dns_ctx.ip_cnt; i++) {
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if (service->bind_ip_list) {
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snprintf(buf, size, "%s@%s:%d",
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service->bind_ip_list[service->bind_ip_index++],
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entry->dns_ctx.ip[i],
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entry->dns_ctx.port[i] > 0
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? entry->dns_ctx.port[i] : entry->server_port);
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if (service->bind_ip_list[service->bind_ip_index] == NULL)
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service->bind_ip_index = 0;
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} else {
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snprintf(buf, size, "%s:%d", entry->dns_ctx.ip[i],
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entry->dns_ctx.port[i] > 0
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? entry->dns_ctx.port[i] : entry->server_port);
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}
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entry->ip_idx++;
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acl_debug(23, 2) ("%s(%d): domain(%s), addr(%s)",
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myname, __LINE__, entry->domain_key, buf);
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return (buf);
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}
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return (NULL);
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}
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static ACL_ASTREAM *forward_connect_next(CLIENT_ENTRY *entry)
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{
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const char* myname = "forward_connect_next";
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SERVICE *service = entry->service;
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ACL_ASTREAM* server;
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int i = 0;
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while (1) {
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if (next_server_addr(entry, entry->domain_addr,
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sizeof(entry->domain_addr)) == NULL)
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break;
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server = acl_aio_connect(entry->client->aio,
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entry->domain_addr, service->conn_timeout);
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if (server != NULL)
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return (server);
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acl_msg_error("%s: connect server addr(%s), domain(%s), i=%d",
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myname, entry->domain_addr, entry->domain_key, i);
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i++;
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}
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return (NULL);
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}
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static int connect_close_callback(ACL_ASTREAM *astream, void *context)
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{
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const char* myname = "connect_close_callback";
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CLIENT_ENTRY *entry = (CLIENT_ENTRY *) context;
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/* 卸载回调函数，防止被重复调用 */
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acl_aio_ctl(astream,
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ACL_AIO_CTL_TIMEO_HOOK_DEL, connect_timeout_callback, entry,
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ACL_AIO_CTL_END);
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if (entry->flag_has_replied == 1)
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return (-1);
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if (entry->ip_idx < entry->dns_ctx.ip_cnt) {
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ACL_ASTREAM* server;
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acl_debug(23, 1) ("%s(%d): begin to connect next ip(%s:%d)",
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myname, __LINE__, entry->dns_ctx.ip[entry->ip_idx],
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entry->server_port);
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/* 断开与服务端的连接，但保持与浏览器端的连接
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* XXX: 因为该函数将清除一些关闭回调函数，不知是否会造成某些内存泄漏？
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* 注，此处并不关闭服务端连接，需要调用者自己来关闭
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*/
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if (entry->server && client_entry_detach(entry, acl_aio_vstream(entry->server))) {
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acl_debug(23, 1) ("%s(%d): entry's freed", myname, __LINE__);
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return (-1);
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}
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server = forward_connect_next(entry);
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if (server == NULL)
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goto CONNECT_ERROR;
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client_entry_set_server(entry, server);
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acl_aio_ctl(server,
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ACL_AIO_CTL_CONNECT_HOOK_ADD, connect_callback,
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ACL_AIO_CTL_CLOSE_HOOK_ADD, connect_close_callback, entry,
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ACL_AIO_CTL_TIMEO_HOOK_ADD, connect_timeout_callback, entry,
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ACL_AIO_CTL_CTX, entry,
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ACL_AIO_CTL_END);
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/* 通过返回-1，使异步流框架关闭服务端连接 */
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return (-1);
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}
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CONNECT_ERROR:
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entry->tm.connect = time(NULL) - entry->tm.stamp;
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if (entry->ip_idx <= 0)
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acl_debug(23, 0) ("%s(%d): internal error, ip_idx=%d, domain(%s:%d)",
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myname, __LINE__, entry->ip_idx,
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entry->domain_key, entry->server_port);
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else
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acl_debug(23, 0) ("%s(%d): connect error, addr(%s:%d), domain(%s)",
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myname, __LINE__,
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entry->dns_ctx.ip[entry->ip_idx - 1],
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entry->server_port,
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entry->domain_key);
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entry->flag_has_replied = 1;
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if (entry->connect_error_fn)
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entry->connect_error_fn(entry);
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return (-1);
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}
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static int connect_timeout_callback(ACL_ASTREAM *astream, void *context)
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{
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const char* myname = "connect_timeout_callback";
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CLIENT_ENTRY *entry = (CLIENT_ENTRY *) context;
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/* 卸载回调函数，防止被重复调用 */
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acl_aio_ctl(astream,
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ACL_AIO_CTL_TIMEO_HOOK_DEL, connect_timeout_callback, entry,
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ACL_AIO_CTL_END);
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if (entry->flag_has_replied == 1)
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return (-1);
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if (entry->ip_idx < entry->dns_ctx.ip_cnt) {
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ACL_ASTREAM *server;
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acl_debug(23, 1) ("%s(%d): begin to connect next ip(%s:%d)",
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myname, __LINE__, entry->dns_ctx.ip[entry->ip_idx],
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entry->server_port);
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/* 断开与服务端的连接，但保持与浏览器端的连接
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* XXX: 因为该函数将清除一些关闭回调函数，不知是否会造成某些内存泄漏？
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* 注，此处并不关闭服务端连接，需要调用者自己来关闭
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*/
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if (client_entry_detach(entry, acl_aio_vstream(entry->server)) == 1) {
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acl_debug(3, 1) ("%s(%d): entry is freed", myname, __LINE__);
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return (-1);
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}
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server = forward_connect_next(entry);
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if (server == NULL)
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goto CONNECT_ERROR;
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client_entry_set_server(entry, server);
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acl_aio_ctl(server,
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ACL_AIO_CTL_CONNECT_HOOK_ADD, connect_callback,
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ACL_AIO_CTL_CLOSE_HOOK_ADD, connect_close_callback, entry,
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ACL_AIO_CTL_TIMEO_HOOK_ADD, connect_timeout_callback, entry,
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ACL_AIO_CTL_CTX, entry,
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ACL_AIO_CTL_END);
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/* 通过返回-1，使异步流框架关闭服务端连接 */
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return (-1);
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}
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CONNECT_ERROR:
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entry->tm.connect = time(NULL) - entry->tm.stamp;
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if (entry->ip_idx <= 0)
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acl_debug(23, 0) ("%s(%d): internal error, ip_idx=0, domain(%s:%d)",
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myname, __LINE__, entry->domain_key, entry->server_port);
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else
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acl_debug(23, 0) ("%s(%d): connect timeout, addr(%s:%d)",
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myname, __LINE__,
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entry->dns_ctx.ip[entry->ip_idx - 1],
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entry->server_port);
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entry->flag_has_replied = 1;
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if (entry->connect_timeout_fn)
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entry->connect_timeout_fn(entry);
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return (-1);
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}
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static int connect_callback(ACL_ASTREAM *server, void *context)
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{
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CLIENT_ENTRY *entry = (CLIENT_ENTRY*) context;
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entry->tm.connect = time(NULL) - entry->tm.stamp;
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return (entry->connect_notify_fn(entry));
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}
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void forward_start(CLIENT_ENTRY *entry)
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{
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const char *myname = "forward_start";
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ACL_ASTREAM *server;
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/* 先从连接池中尝试一个连接流 */
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server = peek_server_conn(entry);
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if (server == NULL) {
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/* 如果连接池中没有可利用的连接流，则开始连接服务端 */
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server = forward_connect_next(entry);
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if (server == NULL) {
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acl_msg_error("%s: connect server_addr(%s:%d) error(%s)",
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myname, entry->domain_key, entry->server_port,
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acl_last_serror());
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#if 1
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if (entry->connect_error_fn)
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entry->connect_error_fn(entry);
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#else
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forward_complete(entry);
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#endif
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return;
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}
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entry->flag_conn_reuse = 0;
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client_entry_set_server(entry, server);
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acl_aio_ctl(server,
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ACL_AIO_CTL_CONNECT_HOOK_ADD, connect_callback,
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ACL_AIO_CTL_CTX, entry,
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ACL_AIO_CTL_CLOSE_HOOK_ADD, connect_close_callback, entry,
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ACL_AIO_CTL_TIMEO_HOOK_ADD, connect_timeout_callback, entry,
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ACL_AIO_CTL_END);
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} else {
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/* 复用连接池中的连接 */
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entry->flag_conn_reuse = 1;
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client_entry_set_server(entry, server);
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acl_aio_ctl(server, ACL_AIO_CTL_CTX, entry, ACL_AIO_CTL_END);
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connect_callback(server, entry);
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}
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}
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