Phase 5: 反向代理连接池完善 — 连接有效性检测 + 统计指标 + 单元测试
- 新增 proxy_pool_conn_is_alive(): 使用 recv(MSG_PEEK | MSG_DONTWAIT) 非阻塞检测连接是否被对端关闭，复用前自动剔除失效连接 - 新增 cocoon_pool_stats_t 统计结构：总请求、命中、新建、驱逐、 有效性检测失败、活跃连接数、空闲连接数 - 连接池 acquire/release 全流程统计追踪 - 新增 7 项 proxy 单元测试： - 连接有效性检测（无效 fd、已关闭、有效 socket） - acquire/release 复用循环 - 空池新建失败边界 - 统计初始状态 - 全部测试通过：458 单元测试 + 115 集成测试
This commit is contained in:
xfy911
parent
fb446ac7e6
commit
b426ab7130
66
proxy.c
66
proxy.c
@ -43,6 +43,7 @@ void proxy_pool_init(cocoon_proxy_backend_t *backend, size_t max_pool_size) {
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if (backend->pool.max_size == 0) {
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backend->pool.max_size = COCOON_POOL_DEFAULT_SIZE;
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}
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memset(&backend->pool.stats, 0, sizeof(backend->pool.stats));
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pthread_mutex_init(&backend->pool.mutex, NULL);
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for (size_t i = 0; i < COCOON_POOL_MAX_CAPACITY; i++) {
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backend->pool.conns[i].fd = COCOON_INVALID_SOCKET;
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@ -52,6 +53,50 @@ void proxy_pool_init(cocoon_proxy_backend_t *backend, size_t max_pool_size) {
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}
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}
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/**
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* proxy_pool_conn_is_alive - 检测连接是否仍有效
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*
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* 使用 recv(MSG_PEEK | MSG_DONTWAIT) 非阻塞检测连接是否被对端关闭。
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* 不消耗 socket 缓冲区中的数据。
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*/
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bool proxy_pool_conn_is_alive(cocoon_socket_t fd) {
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if (fd == COCOON_INVALID_SOCKET) return false;
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char buf[1];
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ssize_t r = recv(fd, buf, sizeof(buf), MSG_PEEK | MSG_DONTWAIT);
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if (r == 0) {
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/* 对端已关闭 */
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return false;
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}
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if (r < 0) {
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if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) {
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/* 无数据但连接仍有效 */
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return true;
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}
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/* 其他错误（ECONNRESET 等） */
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return false;
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}
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/* 有数据可读，连接有效 */
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return true;
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}
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size_t proxy_pool_get_stats(cocoon_proxy_backend_t *backend, cocoon_pool_stats_t *stats) {
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if (!backend) return 0;
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pthread_mutex_lock(&backend->pool.mutex);
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if (stats) {
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*stats = backend->pool.stats;
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}
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size_t idle = 0;
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for (size_t i = 0; i < backend->pool.max_size; i++) {
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if (!backend->pool.conns[i].in_use &&
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(backend->pool.conns[i].fd != COCOON_INVALID_SOCKET || backend->pool.conns[i].tls_conn)) {
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idle++;
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}
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}
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pthread_mutex_unlock(&backend->pool.mutex);
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return idle;
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}
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void proxy_pool_destroy(cocoon_proxy_backend_t *backend) {
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if (!backend) return;
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pthread_mutex_lock(&backend->pool.mutex);
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@ -91,6 +136,7 @@ bool proxy_pool_acquire(cocoon_proxy_backend_t *backend, cocoon_socket_t *pfd, p
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/* 检查超时 */
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if ((now - pc->last_used) * 1000 > COCOON_POOL_IDLE_TIMEOUT_MS) {
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/* 超时，关闭旧连接 */
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backend->pool.stats.evict_count++;
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if (pc->fd != COCOON_INVALID_SOCKET) {
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cocoon_socket_close(pc->fd);
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pc->fd = COCOON_INVALID_SOCKET;
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@ -102,9 +148,22 @@ bool proxy_pool_acquire(cocoon_proxy_backend_t *backend, cocoon_socket_t *pfd, p
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continue;
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}
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/* 检查连接有效性（非 HTTPS 连接） */
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if (!use_https && !proxy_pool_conn_is_alive(pc->fd)) {
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backend->pool.stats.alive_check_fail++;
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if (pc->fd != COCOON_INVALID_SOCKET) {
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cocoon_socket_close(pc->fd);
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pc->fd = COCOON_INVALID_SOCKET;
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}
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continue;
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}
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/* 标记为使用中 */
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pc->in_use = true;
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pc->last_used = now;
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backend->pool.stats.hit_count++;
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backend->pool.stats.total_requests++;
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backend->pool.stats.active_conns++;
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*pfd = pc->fd;
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*ptls = pc->tls_conn;
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pthread_mutex_unlock(&backend->pool.mutex);
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@ -138,6 +197,9 @@ bool proxy_pool_acquire(cocoon_proxy_backend_t *backend, cocoon_socket_t *pfd, p
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log_debug("连接池新建: %s:%d (fd=%d, tls=%p)",
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backend->target_host, backend->target_port,
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(int)*pfd, (void*)*ptls);
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backend->pool.stats.miss_count++;
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backend->pool.stats.total_requests++;
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backend->pool.stats.active_conns++;
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return true;
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}
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@ -149,6 +211,10 @@ void proxy_pool_release(cocoon_proxy_backend_t *backend, cocoon_socket_t fd, pro
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pthread_mutex_lock(&backend->pool.mutex);
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if (backend->pool.stats.active_conns > 0) {
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backend->pool.stats.active_conns--;
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}
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/* 先尝试找到这个连接的槽位（如果它原本就在池中） */
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for (size_t i = 0; i < backend->pool.max_size; i++) {
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cocoon_pooled_conn_t *pc = &backend->pool.conns[i];
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34
proxy.h
34
proxy.h
@ -26,6 +26,19 @@
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#define COCOON_HEALTHY_THRESHOLD 2 /* 连续成功次数恢复健康 */
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#define COCOON_UNHEALTHY_THRESHOLD 3 /* 连续失败次数标记不健康 */
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/**
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* cocoon_pool_stats_t - 连接池统计
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*/
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typedef struct {
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uint64_t total_requests; /**< 总请求次数 */
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uint64_t hit_count; /**< 复用命中次数 */
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uint64_t miss_count; /**< 新建连接次数 */
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uint64_t evict_count; /**< 超时驱逐次数 */
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uint64_t alive_check_fail; /**< 有效性检测失败次数 */
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size_t active_conns; /**< 当前活跃连接数 */
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size_t idle_conns; /**< 当前空闲连接数 */
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} cocoon_pool_stats_t;
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/**
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* cocoon_pooled_conn_t - 连接池中的单个连接
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*/
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@ -42,6 +55,7 @@ typedef struct {
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typedef struct {
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cocoon_pooled_conn_t conns[COCOON_POOL_MAX_CAPACITY]; /**< 空闲连接数组（上限16） */
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size_t max_size; /**< 实际配置大小（默认4） */
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cocoon_pool_stats_t stats; /**< 连接池统计 */
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pthread_mutex_t mutex; /**< 保护锁 */
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} cocoon_conn_pool_t;
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@ -171,4 +185,24 @@ bool proxy_pool_acquire(cocoon_proxy_backend_t *backend, cocoon_socket_t *pfd, p
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*/
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void proxy_pool_release(cocoon_proxy_backend_t *backend, cocoon_socket_t fd, proxy_tls_conn_t *tls_conn);
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/**
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* proxy_pool_get_stats - 获取连接池统计
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*
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* @param backend 后端配置
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* @param stats 输出统计结构（可选）
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* @return 当前空闲连接数
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*/
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size_t proxy_pool_get_stats(cocoon_proxy_backend_t *backend, cocoon_pool_stats_t *stats);
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/**
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* proxy_pool_conn_is_alive - 检测连接是否仍有效
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*
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* 使用 recv(MSG_PEEK) 非阻塞检测连接是否被对端关闭。
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* 不消耗 socket 缓冲区中的数据。
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*
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* @param fd socket 文件描述符
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* @return true 连接有效，false 连接已失效
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*/
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bool proxy_pool_conn_is_alive(cocoon_socket_t fd);
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#endif /* COCOON_PROXY_H */
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@ -3,6 +3,8 @@
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#include <string.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include <sys/socket.h>
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#include <unistd.h>
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/* 白盒测试：包含 proxy.c 以访问静态函数 */
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#define UNIT_TEST
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@ -364,6 +366,126 @@ void test_pool_init_zero_uses_default(void) {
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proxy_pool_destroy(&backend);
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}
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/* ===== proxy_pool_conn_is_alive ===== */
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void test_conn_is_alive_invalid_fd(void) {
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TEST_ASSERT_FALSE(proxy_pool_conn_is_alive(COCOON_INVALID_SOCKET));
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}
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void test_conn_is_alive_closed_fd(void) {
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int fds[2];
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) != 0) {
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TEST_IGNORE_MESSAGE("socketpair 创建失败，跳过测试");
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return;
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}
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close(fds[0]); /* 关闭一端 */
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/* 另一端应该检测到对端关闭 */
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TEST_ASSERT_FALSE(proxy_pool_conn_is_alive(fds[1]));
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close(fds[1]);
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}
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void test_conn_is_alive_valid_socket(void) {
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int fds[2];
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) != 0) {
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TEST_IGNORE_MESSAGE("socketpair 创建失败，跳过测试");
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return;
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}
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/* 两端都打开，连接有效 */
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TEST_ASSERT_TRUE(proxy_pool_conn_is_alive(fds[1]));
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close(fds[0]);
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close(fds[1]);
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}
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/* ===== proxy_pool_acquire / release 循环 ===== */
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void test_pool_acquire_release_cycle(void) {
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cocoon_proxy_backend_t backend = {0};
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backend.target_https = false;
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proxy_pool_init(&backend, 2);
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/* 模拟连接：用 socketpair */
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int fds[2];
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) != 0) {
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TEST_IGNORE_MESSAGE("socketpair 创建失败，跳过测试");
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proxy_pool_destroy(&backend);
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return;
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}
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/* 第一次 acquire：池中无可用连接，但当前代码没有真实连接时不会新建
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* 我们手动将一个 socket 放入池中，模拟已有连接 */
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backend.pool.conns[0].fd = fds[1];
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backend.pool.conns[0].in_use = false;
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backend.pool.conns[0].last_used = time(NULL);
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cocoon_socket_t pfd = COCOON_INVALID_SOCKET;
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proxy_tls_conn_t *ptls = NULL;
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bool ok = proxy_pool_acquire(&backend, &pfd, &ptls);
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TEST_ASSERT_TRUE(ok);
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TEST_ASSERT_EQUAL(fds[1], pfd);
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TEST_ASSERT_NULL(ptls);
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/* 释放回池 */
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proxy_pool_release(&backend, pfd, ptls);
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/* 再次 acquire，应该复用 */
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cocoon_socket_t pfd2 = COCOON_INVALID_SOCKET;
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proxy_tls_conn_t *ptls2 = NULL;
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ok = proxy_pool_acquire(&backend, &pfd2, &ptls2);
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TEST_ASSERT_TRUE(ok);
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TEST_ASSERT_EQUAL(fds[1], pfd2);
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/* 统计：2次复用（第一次 + 第二次） */
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cocoon_pool_stats_t stats;
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proxy_pool_get_stats(&backend, &stats);
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TEST_ASSERT_EQUAL(2, stats.hit_count);
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TEST_ASSERT_EQUAL(0, stats.miss_count);
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proxy_pool_release(&backend, pfd2, ptls2);
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proxy_pool_destroy(&backend);
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close(fds[0]);
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}
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void test_pool_acquire_new_conn_miss(void) {
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cocoon_proxy_backend_t backend = {0};
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backend.target_https = false;
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strcpy(backend.target_host, "255.255.255.255"); /* 不可达，新建连接会失败 */
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backend.target_port = 1;
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proxy_pool_init(&backend, 2);
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/* 空池 acquire：会尝试新建连接 */
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cocoon_socket_t pfd = COCOON_INVALID_SOCKET;
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proxy_tls_conn_t *ptls = NULL;
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bool ok = proxy_pool_acquire(&backend, &pfd, &ptls);
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/* 新建连接会失败（因为 target 不可达） */
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TEST_ASSERT_FALSE(ok);
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/* 统计：miss_count 应该没有增加，因为连接没建立成功 */
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cocoon_pool_stats_t stats;
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proxy_pool_get_stats(&backend, &stats);
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TEST_ASSERT_EQUAL(0, stats.miss_count);
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TEST_ASSERT_EQUAL(0, stats.hit_count);
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proxy_pool_destroy(&backend);
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}
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/* ===== proxy_pool_get_stats ===== */
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void test_pool_stats_initial(void) {
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cocoon_proxy_backend_t backend = {0};
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proxy_pool_init(&backend, 4);
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cocoon_pool_stats_t stats;
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size_t idle = proxy_pool_get_stats(&backend, &stats);
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TEST_ASSERT_EQUAL(0, idle);
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TEST_ASSERT_EQUAL(0, stats.total_requests);
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TEST_ASSERT_EQUAL(0, stats.hit_count);
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TEST_ASSERT_EQUAL(0, stats.miss_count);
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TEST_ASSERT_EQUAL(0, stats.active_conns);
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TEST_ASSERT_EQUAL(0, stats.evict_count);
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proxy_pool_destroy(&backend);
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}
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/* ===== 主函数 ===== */
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int main(void) {
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@ -418,5 +540,17 @@ int main(void) {
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RUN_TEST(test_pool_init_capped);
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RUN_TEST(test_pool_init_zero_uses_default);
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/* proxy_pool_conn_is_alive */
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RUN_TEST(test_conn_is_alive_invalid_fd);
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RUN_TEST(test_conn_is_alive_closed_fd);
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RUN_TEST(test_conn_is_alive_valid_socket);
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/* proxy_pool_acquire/release */
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RUN_TEST(test_pool_acquire_release_cycle);
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RUN_TEST(test_pool_acquire_new_conn_miss);
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/* proxy_pool_stats */
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RUN_TEST(test_pool_stats_initial);
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return UNITY_END();
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}
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