54 lines
1.2 KiB
Go
54 lines
1.2 KiB
Go
package main
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import (
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"context"
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"embed"
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"flag"
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"html/template"
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"log"
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"net/http"
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"os"
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"os/signal"
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"syscall"
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)
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//go:embed templates
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var templatesFS embed.FS
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func main() {
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listen := flag.String("listen", ":8080", "HTTP listen address")
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target := flag.String("target", "localhost:9091", "default gRPC endpoint (aggregator or collector)")
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n := flag.Int("n", 25, "default number of table rows")
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refresh := flag.Int("refresh", 30, "meta-refresh interval in seconds (0 = disabled)")
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flag.Parse()
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funcMap := template.FuncMap{"fmtCount": fmtCount}
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tmpl := template.Must(
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template.New("").Funcs(funcMap).ParseFS(templatesFS, "templates/*.html"),
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)
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h := &Handler{
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defaultTarget: *target,
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defaultN: *n,
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refreshSecs: *refresh,
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tmpl: tmpl,
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}
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srv := &http.Server{Addr: *listen, Handler: h}
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ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
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defer stop()
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go func() {
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log.Printf("frontend: listening on %s (default target %s)", *listen, *target)
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if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
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log.Printf("frontend: %v", err)
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os.Exit(1)
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}
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}()
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<-ctx.Done()
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log.Printf("frontend: shutting down")
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srv.Shutdown(context.Background())
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}
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