internal/server/server.go (view raw)
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import (
"context"
"fmt"
"net"
"net/http"
"net/url"
"slices"
"time"
cfg "website/internal/config"
"website/internal/log"
"website/internal/website"
"github.com/pkg/errors"
"golang.org/x/net/http2"
"golang.org/x/net/http2/h2c"
)
var (
CommitSHA = "local"
ShortSHA = "local"
serverHeader = fmt.Sprintf("website (%s)", ShortSHA)
)
type Config struct {
Production bool `conf:"default:false"`
InDevServer bool `conf:"default:false"`
Root string `conf:"default:website"`
ListenAddress string `conf:"default:localhost"`
Port string `conf:"default:3000,short:p"`
}
type Server struct {
*http.Server
}
func applyDevModeOverrides(config *cfg.Config, listenAddress string) {
config.CSP.ScriptSrc = slices.Insert(config.CSP.ScriptSrc, 0, "'unsafe-inline'")
config.CSP.ConnectSrc = slices.Insert(config.CSP.ConnectSrc, 0, "'self'")
config.BaseURL = cfg.URL{
URL: &url.URL{
Scheme: "http",
Host: listenAddress,
},
}
}
func serverHeaderHandler(wrappedHandler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.ProtoMajor >= 2 && r.Header.Get("Host") != "" {
// net/http does this for HTTP/1.1, but not h2c
// TODO: check with HTTP/2.0 (i.e. with TLS)
r.Host = r.Header.Get("Host")
r.Header.Del("Host")
}
w.Header().Set("Server", serverHeader)
wrappedHandler.ServeHTTP(w, r)
})
}
func New(runtimeConfig *Config) (*Server, error) {
var err error
config, err := cfg.GetConfig()
if err != nil {
return nil, errors.WithMessage(err, "error parsing configuration file")
}
listenAddress := net.JoinHostPort(runtimeConfig.ListenAddress, runtimeConfig.Port)
if !runtimeConfig.Production {
applyDevModeOverrides(config, listenAddress)
}
top := http.NewServeMux()
mux, err := website.NewMux(config, runtimeConfig.Root)
if err != nil {
return nil, errors.Wrap(err, "could not create website mux")
}
log.Debug("binding main handler to", "host", listenAddress)
hostname := config.BaseURL.Hostname()
top.Handle(hostname+"/", mux)
top.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
newURL := config.BaseURL.JoinPath(r.URL.String())
http.Redirect(w, r, newURL.String(), 301)
})
top.HandleFunc("/health", func(w http.ResponseWriter, _ *http.Request) {
w.WriteHeader(http.StatusNoContent)
})
return &Server{
&http.Server{
Addr: listenAddress,
ReadHeaderTimeout: 1 * time.Minute,
Handler: http.MaxBytesHandler(h2c.NewHandler(
serverHeaderHandler(
wrapHandlerWithLogging(top),
),
&http2.Server{
IdleTimeout: 15 * time.Minute,
},
), 0),
},
}, nil
}
func (s *Server) Start() error {
if err := s.ListenAndServe(); err != http.ErrServerClosed {
return errors.Wrap(err, "error creating/closing server")
}
return nil
}
func (s *Server) Stop() chan struct{} {
log.Debug("stop called")
idleConnsClosed := make(chan struct{})
go func() {
log.Debug("shutting down server")
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
err := s.Server.Shutdown(ctx)
log.Debug("server shut down")
if err != nil {
// Error from closing listeners, or context timeout:
log.Warn("HTTP server Shutdown", "error", err)
}
close(idleConnsClosed)
}()
return idleConnsClosed
}
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