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第六部分：构建与测试

6.1 单元测试（Unity框架）

// tests/unit/test_sds.c #include "unity.h" #include "sds.h" void setUp(void) {} void tearDown(void) {} void test_sds_new(void) { sds str = sdsnew("Hello"); TEST_ASSERT_NOT_NULL(str); TEST_ASSERT_EQUAL_STRING("Hello", str); TEST_ASSERT_EQUAL(5, sdslen(str)); sdsfree(str); } void test_sds_cat(void) { sds str = sdsnew("Hello"); str = sdscat(str, " World"); TEST_ASSERT_EQUAL_STRING("Hello World", str); TEST_ASSERT_EQUAL(11, sdslen(str)); sdsfree(str); } void test_sds_cpy(void) { sds str = sdsnew("Hello"); str = sdscpy(str, "Hi"); TEST_ASSERT_EQUAL_STRING("Hi", str); TEST_ASSERT_EQUAL(2, sdslen(str)); sdsfree(str); } int main(void) { UNITY_BEGIN(); RUN_TEST(test_sds_new); RUN_TEST(test_sds_cat); RUN_TEST(test_sds_cpy); return UNITY_END(); }

6.2 压力测试

// tests/benchmark/bench_cache.c #include #include #include #include #include #include #include #define THREADS 4 #define REQUESTS_PER_THREAD 1000000 #define HOST "127.0.0.1" #define PORT 6379 typedef struct { int thread_id; long long requests; long long successes; long long total_time_us; } bench_result; void *bench_thread(void *arg) { bench_result *result = (bench_result *)arg; redisContext *c = redisConnect(HOST, PORT); if (!c || c->err) { printf("连接失败: %s\n", c ? c->errstr : "未知错误"); return NULL; } struct timeval start, end; gettimeofday(&start, NULL); for (int i = 0; i < REQUESTS_PER_THREAD; i++) { // SET命令 char key[32], value[64]; snprintf(key, sizeof(key), "key:%d:%d", result->thread_id, i); snprintf(value, sizeof(value), "value:%d:%d", result->thread_id, i); redisReply *reply = redisCommand(c, "SET %s %s", key, value); if (reply && reply->type == REDIS_REPLY_STATUS && strcmp(reply->str, "OK") == 0) { result->successes++; } freeReplyObject(reply); // GET命令 reply = redisCommand(c, "GET %s", key); if (reply && reply->type == REDIS_REPLY_STRING) { result->successes++; } freeReplyObject(reply); result->requests += 2; } gettimeofday(&end, NULL); result->total_time_us = (end.tv_sec - start.tv_sec) * 1000000 + (end.tv_usec - start.tv_usec); redisFree(c); return NULL; } int main() { pthread_t threads[THREADS]; bench_result results[THREADS]; for (int i = 0; i < THREADS; i++) { results[i].thread_id = i; results[i].requests = 0; results[i].successes = 0; results[i].total_time_us = 0; pthread_create(&threads[i], NULL, bench_thread, &results[i]); } long long total_requests = 0; long long total_successes = 0; long long max_time_us = 0; for (int i = 0; i < THREADS; i++) { pthread_join(threads[i], NULL); total_requests += results[i].requests; total_successes += results[i].successes; if (results[i].total_time_us > max_time_us) { max_time_us = results[i].total_time_us; } } double qps = (double)total_requests / (max_time_us / 1000000.0); double success_rate = (double)total_successes / total_requests * 100; printf("========== 压测结果 ==========\n"); printf("总请求数: %lld\n", total_requests); printf("成功数: %lld\n", total_successes); printf("成功率: %.2f%%\n", success_rate); printf("QPS: %.0f\n", qps); printf("平均延迟: %.2f us\n", max_time_us / (double)total_requests); return 0; }

第七部分：部署与运维

7.1 Systemd服务配置

# /etc/systemd/system/ccache.service [Unit] Description=C-Cache High Performance Memory Cache After=network.target Documentation=https://github.com/ccache/ccache [Service] Type=simple User=ccache Group=ccache ExecStart=/usr/local/bin/ccache /etc/ccache/ccache.conf ExecReload=/bin/kill -HUP $MAINPID ExecStop=/bin/kill -TERM $MAINPID Restart=on-failure RestartSec=5s LimitNOFILE=65536 LimitMEMLOCK=infinity # 安全加固 NoNewPrivileges=yes PrivateTmp=yes ProtectSystem=full ProtectHome=yes ReadWritePaths=/var/lib/ccache /var/log/ccache [Install] WantedBy=multi-user.target

7.2 Docker镜像构建

# Dockerfile FROM alpine:3.18 AS builder RUN apk add --no-cache gcc make musl-dev linux-headers COPY . /src WORKDIR /src RUN make && make install FROM alpine:3.18 RUN apk add --no-cache libgcc COPY --from=builder /usr/local/bin/ccache /usr/local/bin/ccache COPY --from=builder /etc/ccache/ccache.conf /etc/ccache/ccache.conf RUN adduser -D -h /var/lib/ccache ccache USER ccache EXPOSE 6379 ENTRYPOINT ["/usr/local/bin/ccache"] CMD ["/etc/ccache/ccache.conf"]

7.3 监控指标暴露

// src/monitor/metrics.c #include #include "dict.h" #include "atomic.h" /* 性能计数器 */ static atomic64_t total_commands_processed; static atomic64_t total_net_input_bytes; static atomic64_t total_net_output_bytes; static atomic64_t total_expired_keys; static atomic64_t total_evicted_keys; /* 获取统计信息 */ sds getInfo(sds info) { info = sdscatprintf(info, "# Server\r\n" "redis_version:%s\r\n" "os:%s\r\n" "arch_bits:%d\r\n" "process_id:%d\r\n" "\r\n" "# Clients\r\n" "connected_clients:%d\r\n" "\r\n" "# Memory\r\n" "used_memory:%zu\r\n" "used_memory_human:%s\r\n" "\r\n" "# Stats\r\n" "total_commands_processed:%lld\r\n" "instantaneous_ops_per_sec:%lld\r\n" "total_net_input_bytes:%lld\r\n" "total_net_output_bytes:%lld\r\n" "expired_keys:%lld\r\n" "evicted_keys:%lld\r\n" "\r\n", CCACHE_VERSION, getOS(), sizeof(void*) * 8, getpid(), server.clients_count, zmalloc_used_memory(), bytesToHuman(mem_str, zmalloc_used_memory()), atomic64_read(&total_commands_processed), getInstantaneousOpsPerSec(), atomic64_read(&total_net_input_bytes), atomic64_read(&total_net_output_bytes), atomic64_read(&total_expired_keys), atomic64_read(&total_evicted_keys) ); return info; }

C语言企业级开发的关键不在于写出多么精巧的代码，而在于构建一套可持续维护、可扩展、高性能的工程体系。希望本文能够帮助你跨越"会写C语言"到"能开发企业级系统"之间的鸿沟。