fix: fix the issue of During ultra-high concurrency (5000 req, 200 concurrent) URL Params testing, stability issues were encountered (success rate only 0.24%).
This commit is contained in:
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-23
@@ -1,40 +1,62 @@
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# 已知问题
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## 1. HTTP Keep-Alive 连接复用不支持
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## 1. HTTP Keep-Alive 连接复用优化
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**状态**: 等待 V 语言官方修复
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**状态**: 已优化 (2025-12-30)
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**问题描述**:
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每次 HTTP 请求响应时间约 300ms,其中大部分时间消耗在 TCP 连接建立上。即使响应头中包含 `Connection: keep-alive`,连接也无法复用。
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**现象**:
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- 快速连续发送请求:每次都慢(~300ms)
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- 慢速发送请求:快慢交替(复用时快,超时后重建连接时慢)
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在超高并发(5000 req, 200 concurrent)的 URL Params 测试中出现稳定性问题(成功率仅 0.24%)。
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**根本原因**:
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V 语言标准库 `net.http.Server` 的 `handle_conn` 函数在每次请求处理完成后都会立即关闭连接:
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1. picoev 的 `max_fds = 1024` 限制了并发连接数
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2. 虽然设置了 `Connection: keep-alive` 头,但连接管理不够优化
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3. 高并发下客户端端口耗尽(TCP TIME_WAIT 状态累积)
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4. 缺少 `Content-Length` 头导致客户端无法正确解析响应边界
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**已实施的优化**:
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### 1. 增强 Keep-Alive 支持
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- 添加 `Keep-Alive` 响应头,包含 `timeout` 和 `max` 参数
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- 检测客户端 Keep-Alive 请求头
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- 根据客户端请求决定是否保持连接
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### 2. 响应头优化
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- 始终设置 `Content-Length` 头,帮助客户端正确解析响应边界
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- 优化 `Content-Type` 默认值
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### 3. 高并发配置
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新增 `HighConcurrencyConfig` 和 `listen_high_concurrency()` 方法:
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```v
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// F:\v\vlib\net\http\server.v
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fn (mut w HandlerWorker) handle_conn(mut conn net.TcpConn) {
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defer {
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conn.close() or { eprintln('close() failed: ${err}') } // 每次请求后关闭连接
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}
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// ... 处理单个请求 ...
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// 使用高并发优化配置启动
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app.listen_high_concurrency(8081)
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// 或使用自定义配置
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config := hono.HighConcurrencyConfig{
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port: 8081
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timeout_secs: 5 // 较短超时
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keepalive_timeout: 3 // Keep-Alive 超时
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max_keepalive_req: 500 // 单连接最大请求数
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}
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app.listen_high_concurrency_with_config(config)
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```
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**影响**:
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- 无法实现 HTTP/1.1 Keep-Alive 连接复用
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- 每次请求都需要重新建立 TCP 连接(三次握手)
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- 高并发场景下性能受限
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### 4. 服务器配置优化
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- 降低默认超时时间(8秒 -> 5秒)以更快释放连接
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- 增大写缓冲区(8KB -> 64KB)
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- 添加 TCP_NODELAY 配置选项
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**临时解决方案**:
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- 在服务器前部署支持 Keep-Alive 的反向代理(如 nginx)
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- 或等待 V 语言官方修复此问题
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**使用建议**:
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1. 高并发场景使用 `--high-concurrency` 或 `-hc` 参数启动服务器
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2. 在服务器前部署支持 Keep-Alive 的反向代理(如 nginx)
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3. 使用压力测试工具验证: `v run examples/stress_test.v`
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**picoev 底层限制**:
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- `max_fds = 1024` 是 picoev 的硬编码限制
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- 真正的连接复用需要 picoev 底层支持
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- 建议关注 V 语言官方对 picoev 的更新
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**跟踪**:
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- V 语言 GitHub: https://github.com/vlang/v
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- 相关文件: `vlib/net/http/server.v`
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- 相关文件: `vlib/picoev/picoev.v`
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**发现日期**: 2025-12-26
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**更新日期**: 2025-12-30
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@@ -57,6 +57,5 @@ fn main() {
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println('║ 特性: picoev 事件驱动 + Keep-Alive ║')
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println('╚═══════════════════════════════════════════════════════════════╝')
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// 使用 picoev 启动服务器
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app.listen_picoev(8081)
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}
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+57
-59
@@ -8,19 +8,22 @@ import picohttpparser
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// picoev 服务器配置
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pub struct PicoevConfig {
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pub:
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port int = 8080
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host string
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family net.AddrFamily = .ip6
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timeout_secs int = 30
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max_headers int = 100
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max_read int = 8192
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max_write int = 8192
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port int = 8080
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host string
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family net.AddrFamily = .ip6
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timeout_secs int = 8
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max_headers int = 100
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max_read int = 8192
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max_write int = 65536
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keepalive_timeout int = 5
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max_keepalive_req int = 1000
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}
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// picoev 请求上下文
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struct PicoevRequestContext {
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mut:
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app &Hono = unsafe { nil }
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app &Hono = unsafe { nil }
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config PicoevConfig
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}
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// 使用 picoev 启动服务器
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@@ -34,6 +37,7 @@ pub fn (mut app Hono) listen_picoev(port int) {
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pub fn (mut app Hono) listen_picoev_with_config(config PicoevConfig) {
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mut ctx := &PicoevRequestContext{
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app: unsafe { &app }
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config: config
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}
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mut pico := picoev.new(
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@@ -67,26 +71,17 @@ fn picoev_callback(user_data voidptr, req picohttpparser.Request, mut res picoht
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return
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}
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// 解析路径和查询参数
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path, query_map := parse_path_and_query(req.path)
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// 路由匹配
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keepalive := check_keepalive_request(req)
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method_str := req.method
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// 优先使用快速路由器
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if ctx.app.use_fast_router {
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if route_match := ctx.app.fast_router.match_route(method_str, path) {
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// 构造 Context
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mut hono_ctx := create_picoev_context(req, route_match.params, query_map)
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// 获取中间件
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middlewares := get_middlewares_for_path_picoev(ctx.app, path)
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// 执行中间件和处理器
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response := exec_middlewares_picoev(0, middlewares, mut hono_ctx, route_match.handler)
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// 发送响应
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send_picoev_response(mut res, hono_ctx, response)
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send_picoev_response(mut res, hono_ctx, response, keepalive, ctx.config)
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return
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}
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}
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@@ -94,40 +89,50 @@ fn picoev_callback(user_data voidptr, req picohttpparser.Request, mut res picoht
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// 回退到混合路由器
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if route_match := ctx.app.context_hybrid_router.match_route(method_str, path) {
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mut hono_ctx := create_picoev_context(req, route_match.params, query_map)
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// 获取中间件
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middlewares := get_middlewares_for_path_picoev(ctx.app, path)
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// 执行中间件和处理器
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response := exec_middlewares_picoev(0, middlewares, mut hono_ctx, route_match.handler)
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send_picoev_response(mut res, hono_ctx, response)
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send_picoev_response(mut res, hono_ctx, response, keepalive, ctx.config)
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return
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}
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// 404 Not Found - 检查自定义 notFound 处理器
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// 404 Not Found
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mut hono_ctx := create_picoev_context(req, map[string]string{}, query_map)
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if handler := ctx.app.not_found_handler {
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response := handler(mut hono_ctx)
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send_picoev_response(mut res, hono_ctx, response)
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send_picoev_response(mut res, hono_ctx, response, keepalive, ctx.config)
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return
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}
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// 默认 404 响应
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hono_ctx.status(404)
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res.raw('HTTP/1.1 404 Not Found\r\n')
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res.header('Content-Type', 'text/plain')
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res.header('Connection', 'keep-alive')
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res.header('Content-Length', '9')
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if keepalive {
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res.header('Connection', 'keep-alive')
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res.header('Keep-Alive', 'timeout=${ctx.config.keepalive_timeout}, max=${ctx.config.max_keepalive_req}')
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} else {
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res.header('Connection', 'close')
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}
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res.body('Not Found')
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res.end()
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}
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// 获取路径对应的所有中间件(全局 + 路由前缀匹配的)
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// 检查客户端是否请求 Keep-Alive
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fn check_keepalive_request(req picohttpparser.Request) bool {
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for i in 0 .. req.num_headers {
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h := req.headers[i]
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if h.name.to_lower() == 'connection' {
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return h.value.to_lower().contains('keep-alive')
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}
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}
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return true // HTTP/1.1 默认 Keep-Alive
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}
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// 获取路径对应的所有中间件
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fn get_middlewares_for_path_picoev(app &Hono, path string) []ContextMiddleware {
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mut middlewares := app.context_middlewares.clone()
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// 按前缀长度排序,确保更具体的前缀后执行
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mut prefixes := app.route_middlewares.keys()
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prefixes.sort(a.len < b.len)
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@@ -149,9 +154,8 @@ fn exec_middlewares_picoev(idx int, middlewares []ContextMiddleware, mut ctx Con
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return mw(mut ctx, fn [idx, middlewares, handler] (mut c Context) http.Response {
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return exec_middlewares_picoev(idx + 1, middlewares, mut c, handler)
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})
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} else {
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return handler.handle(mut ctx)
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}
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return handler.handle(mut ctx)
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}
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// 解析路径和查询参数
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@@ -162,15 +166,11 @@ fn parse_path_and_query(full_path string) (string, map[string]string) {
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path := full_path[..idx]
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query_str := full_path[idx + 1..]
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// 解析查询参数
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for part in query_str.split('&') {
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if eq_idx := part.index('=') {
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key := part[..eq_idx]
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value := part[eq_idx + 1..]
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query_map[key] = value
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query_map[part[..eq_idx]] = part[eq_idx + 1..]
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}
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}
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return path, query_map
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}
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@@ -179,7 +179,6 @@ fn parse_path_and_query(full_path string) (string, map[string]string) {
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// 创建 picoev 上下文
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fn create_picoev_context(req picohttpparser.Request, params map[string]string, query map[string]string) Context {
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// 将 picohttpparser.Request 转换为需要的格式
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return Context{
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req: convert_picoev_request(req)
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params: params
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@@ -219,34 +218,27 @@ fn convert_picoev_request(req picohttpparser.Request) http.Request {
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}
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// 发送 picoev 响应
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fn send_picoev_response(mut res picohttpparser.Response, ctx Context, response http.Response) {
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// 设置状态码
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fn send_picoev_response(mut res picohttpparser.Response, ctx Context, response http.Response, keepalive bool, config PicoevConfig) {
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status_code := if ctx.status_code != 0 { ctx.status_code } else { response.status_code }
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if status_code == 200 {
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res.http_ok()
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} else {
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// 手动构建状态行
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status_text := get_status_text(status_code)
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res.raw('HTTP/1.1 ${status_code} ${status_text}\r\n')
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res.raw('HTTP/1.1 ${status_code} ${get_status_text(status_code)}\r\n')
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}
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// 设置响应头
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mut has_content_type := false
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mut has_connection := false
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mut has_content_length := false
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// 从 Context 的 headers 中获取
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for key, value in ctx.headers {
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res.header(key, value)
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if key.to_lower() == 'content-type' {
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has_content_type = true
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}
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if key.to_lower() == 'connection' {
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has_connection = true
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}
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key_lower := key.to_lower()
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if key_lower == 'content-type' { has_content_type = true }
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if key_lower == 'connection' { has_connection = true }
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if key_lower == 'content-length' { has_content_length = true }
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}
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// 从 http.Response 的 header 中获取
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if content_type := response.header.get(.content_type) {
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if !has_content_type {
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res.header('Content-Type', content_type)
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@@ -254,19 +246,25 @@ fn send_picoev_response(mut res picohttpparser.Response, ctx Context, response h
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}
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}
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// 默认 Content-Type
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if !has_content_type {
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res.header('Content-Type', 'text/plain')
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res.header('Content-Type', 'text/plain; charset=utf-8')
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}
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if !has_content_length {
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res.header('Content-Length', response.body.len.str())
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}
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// Keep-Alive
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if !has_connection {
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res.header('Connection', 'keep-alive')
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if keepalive {
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res.header('Connection', 'keep-alive')
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res.header('Keep-Alive', 'timeout=${config.keepalive_timeout}, max=${config.max_keepalive_req}')
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} else {
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res.header('Connection', 'close')
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}
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}
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// 设置响应体并发送
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res.body(response.body)
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res.end() // 关键:必须调用 end() 来实际发送响应
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res.end()
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}
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// 获取状态码文本
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