102 lines
3.7 KiB
Go
102 lines
3.7 KiB
Go
// Package httpserver exposes health and authenticated task-management endpoints.
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package httpserver
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import (
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"context"
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"encoding/json"
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"errors"
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"net/http"
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"sync/atomic"
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"time"
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"git.yuntuo.hk/k2safe/orbit/internal/buildinfo"
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"git.yuntuo.hk/k2safe/orbit/internal/observability"
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"git.yuntuo.hk/k2safe/orbit/pulse/service"
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)
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type Checker func(context.Context) error
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// Readiness 将数据库/结构检查与进程排空状态合并为一个就绪门控。
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// 收到终止信号后先调用 BeginDrain，再停止接收新请求；存量请求仍由
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// http.Server.Shutdown 在限定时间内完成。这样编排平台有机会先看到 503。
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type Readiness struct {
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checker Checker
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draining atomic.Bool
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}
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// NewReadiness 创建可在优雅下线期间切换为未就绪的门控。
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func NewReadiness(checker Checker) *Readiness {
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return &Readiness{checker: checker}
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}
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// Check 执行就绪检查；排空开始后始终返回内部错误，由 HTTP 层统一隐藏细节。
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func (r *Readiness) Check(ctx context.Context) error {
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if r == nil || r.draining.Load() {
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return errors.New("server is draining")
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}
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if r.checker == nil {
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return errors.New("readiness checker is unavailable")
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}
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return r.checker(ctx)
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}
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// BeginDrain 先于 http.Server.Shutdown 调用，阻止排空窗口内的新流量。
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func (r *Readiness) BeginDrain() {
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if r != nil {
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r.draining.Store(true)
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}
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}
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func New(addr string, ready Checker, tasks ...*service.Service) *http.Server {
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mux := http.NewServeMux()
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write := func(w http.ResponseWriter, status int, body map[string]string) {
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(status)
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_ = json.NewEncoder(w).Encode(body)
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}
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mux.HandleFunc("GET /health/live", func(w http.ResponseWriter, r *http.Request) {
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write(w, http.StatusOK, map[string]string{"status": "alive"})
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})
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mux.HandleFunc("GET /health/ready", func(w http.ResponseWriter, r *http.Request) {
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ctx, cancel := context.WithTimeout(r.Context(), 2*time.Second)
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defer cancel()
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if ready == nil || ready(ctx) != nil {
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write(w, http.StatusServiceUnavailable, map[string]string{"status": "not_ready"})
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return
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}
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write(w, http.StatusOK, map[string]string{"status": "ready", "scope": "database_and_schema"})
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})
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mux.HandleFunc("GET /version", func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Cache-Control", "no-store")
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w.Header().Set("X-Content-Type-Options", "nosniff")
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusOK)
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_ = json.NewEncoder(w).Encode(buildinfo.Current())
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})
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if len(tasks) > 0 && tasks[0] != nil {
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registerTasks(mux, tasks[0])
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registerHistory(mux, tasks[0])
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}
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return &http.Server{Addr: addr, Handler: mux, ReadHeaderTimeout: 5 * time.Second, ReadTimeout: 10 * time.Second, WriteTimeout: 15 * time.Second, IdleTimeout: 60 * time.Second, MaxHeaderBytes: 16 << 10}
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}
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// WrapMetrics must run after all Register* functions because those functions
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// intentionally register routes on the underlying ServeMux.
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func WrapMetrics(server *http.Server, metrics *observability.Registry) {
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if server == nil || metrics == nil {
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return
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}
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server.Handler = metrics.Middleware(server.Handler)
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}
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// NewMetricsServer uses a distinct listener so public API routing cannot expose
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// operational aggregates. It does not provide business or database endpoints.
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func NewMetricsServer(addr string, metrics *observability.Registry) *http.Server {
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mux := http.NewServeMux()
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if metrics != nil {
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mux.Handle("GET /metrics", metrics)
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}
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return &http.Server{Addr: addr, Handler: mux, ReadHeaderTimeout: 2 * time.Second,
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ReadTimeout: 3 * time.Second, WriteTimeout: 5 * time.Second, IdleTimeout: 15 * time.Second, MaxHeaderBytes: 8 << 10}
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}
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