NotAShelf
3a80551898
Signed-off-by: NotAShelf <raf@notashelf.dev> Change-Id: Ibcafdb7084453ee4f8a8b76b1ee222466a6a6964
127 lines
3.3 KiB
Go
127 lines
3.3 KiB
Go
package server
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import (
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"fmt"
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"io"
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"log/slog"
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"net/http"
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"strings"
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"time"
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"notashelf.dev/ncro/internal/config"
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"notashelf.dev/ncro/internal/prober"
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"notashelf.dev/ncro/internal/router"
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)
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// HTTP handler implementing the Nix binary cache protocol.
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type Server struct {
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router *router.Router
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prober *prober.Prober
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upstreams []config.UpstreamConfig
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client *http.Client
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}
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// Creates a Server.
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func New(r *router.Router, p *prober.Prober, upstreams []config.UpstreamConfig) *Server {
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return &Server{
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router: r,
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prober: p,
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upstreams: upstreams,
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client: &http.Client{Timeout: 60 * time.Second},
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}
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}
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func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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path := r.URL.Path
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switch {
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case path == "/nix-cache-info":
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s.handleCacheInfo(w, r)
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case path == "/health":
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s.handleHealth(w, r)
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case strings.HasSuffix(path, ".narinfo"):
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s.handleNarinfo(w, r)
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case strings.HasPrefix(path, "/nar/"):
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s.handleNAR(w, r)
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default:
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http.NotFound(w, r)
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}
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}
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func (s *Server) handleCacheInfo(w http.ResponseWriter, _ *http.Request) {
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w.Header().Set("Content-Type", "text/plain")
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fmt.Fprintln(w, "StoreDir: /nix/store")
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fmt.Fprintln(w, "WantMassQuery: 1")
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fmt.Fprintln(w, "Priority: 30")
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}
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func (s *Server) handleHealth(w http.ResponseWriter, _ *http.Request) {
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w.Header().Set("Content-Type", "application/json")
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fmt.Fprintln(w, `{"status":"ok"}`)
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}
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func (s *Server) handleNarinfo(w http.ResponseWriter, r *http.Request) {
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hash := strings.TrimSuffix(strings.TrimPrefix(r.URL.Path, "/"), ".narinfo")
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result, err := s.router.Resolve(hash, s.upstreamURLs())
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if err != nil {
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slog.Warn("narinfo not found", "hash", hash, "error", err)
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http.NotFound(w, r)
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return
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}
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slog.Info("narinfo routed", "hash", hash, "upstream", result.URL, "cache_hit", result.CacheHit)
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s.proxyRequest(w, r, result.URL+r.URL.Path)
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}
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func (s *Server) handleNAR(w http.ResponseWriter, r *http.Request) {
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sorted := s.prober.SortedByLatency()
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if len(sorted) == 0 {
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http.Error(w, "no upstreams available", http.StatusServiceUnavailable)
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return
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}
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slog.Debug("proxying NAR", "path", r.URL.Path, "upstream", sorted[0].URL)
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s.proxyRequest(w, r, sorted[0].URL+r.URL.Path)
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}
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// Forwards r to targetURL and streams the response zero-copy.
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func (s *Server) proxyRequest(w http.ResponseWriter, r *http.Request, targetURL string) {
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req, err := http.NewRequestWithContext(r.Context(), r.Method, targetURL, r.Body)
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if err != nil {
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http.Error(w, "internal error", http.StatusInternalServerError)
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return
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}
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for _, h := range []string{"Accept", "Accept-Encoding", "Range"} {
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if v := r.Header.Get(h); v != "" {
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req.Header.Set(h, v)
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}
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}
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resp, err := s.client.Do(req)
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if err != nil {
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slog.Error("upstream request failed", "url", targetURL, "error", err)
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http.Error(w, "upstream error", http.StatusBadGateway)
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return
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}
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defer resp.Body.Close()
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for _, h := range []string{
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"Content-Type", "Content-Length", "Content-Encoding",
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"X-Nix-Signature", "Cache-Control", "Last-Modified",
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} {
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if v := resp.Header.Get(h); v != "" {
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w.Header().Set(h, v)
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}
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}
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w.WriteHeader(resp.StatusCode)
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if _, err := io.Copy(w, resp.Body); err != nil {
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slog.Warn("stream interrupted", "url", targetURL, "error", err)
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}
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}
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func (s *Server) upstreamURLs() []string {
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urls := make([]string, len(s.upstreams))
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for i, u := range s.upstreams {
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urls[i] = u.URL
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}
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return urls
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}
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