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package main
import (
"compress/gzip"
"context"
"flag"
"fmt"
"log/slog"
"net/http"
"nonsense-time/api"
"os"
"time"
)
var logger *slog.Logger
// Middleware to timeout requests after a given duration
func timeoutMiddleware(next http.Handler, duration time.Duration) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx, cancel := context.WithTimeout(r.Context(), duration)
defer cancel()
next.ServeHTTP(w, r.WithContext(ctx))
})
}
type gzipResponseWriter struct {
gzw gzip.Writer
hrw http.ResponseWriter
}
func (gzrw gzipResponseWriter) Header() http.Header {
headers := gzrw.hrw.Header()
// TODO: add gzip header
return headers
}
func (gzrw gzipResponseWriter) Write(p []byte) (int, error) {
// TODO: write data using gzrw.gzw.Write
return gzrw.hrw.Write(p)
}
func (gzrw gzipResponseWriter) WriteHeader(statuscode int) {
gzrw.hrw.WriteHeader(statuscode)
}
// Middleware to conditionally gzip a response
func gzipMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// TODO: check for support gzip header
gzrw := gzipResponseWriter{hrw: w}
next.ServeHTTP(gzrw, r)
})
}
func main() {
port := flag.Int("p", 8080, "the port to listen on")
bindAddr := flag.String("b", "", "the adress to bind to (leave empty for all interfaces)")
waitTime := flag.Duration("w", 2*time.Second, "the maximum time for a request, unit defaults to ns")
logLevel := flag.String("l", "info", "log level (debug, info, warn, error)")
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage: %s [options]\n", os.Args[0])
fmt.Fprintln(os.Stderr, "Options:")
flag.PrintDefaults()
}
flag.Parse()
mux := http.NewServeMux()
loggerOpts := new(slog.HandlerOptions)
switch *logLevel {
case "debug":
loggerOpts.Level = slog.LevelDebug
loggerOpts.AddSource = true
case "info":
loggerOpts.Level = slog.LevelInfo
case "warn":
loggerOpts.Level = slog.LevelDebug
case "error":
loggerOpts.Level = slog.LevelError
default:
panic(fmt.Sprintf("Unkown log level %s", *logLevel))
}
addr := fmt.Sprintf("%s:%d", *bindAddr, *port)
logger = slog.New(slog.NewTextHandler(os.Stdout, loggerOpts))
api.Logger = logger
vtt := timeoutMiddleware(http.HandlerFunc(api.VttOnline), *waitTime)
mux.Handle("GET /vtt/status", vtt)
mux.HandleFunc("GET /vtt", api.VttRedirect)
mux.HandleFunc("GET /vtt/logs", api.VttLogs)
logger.Info(fmt.Sprint("Listening on ", addr))
logger.Info(http.ListenAndServe(addr, mux).Error())
}
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