refactor(tvix/nar-bridge): simplify CLI interface r/6613

Only keep the `serve` subcommand, and make it appear at the root.
Introduce a --log-level argument, and be a bit less noisy in normal
operation.

Change-Id: I86b8abde1869a5c0c947508bcc29f845222aac09
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9360
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: Connor Brewster <cbrewster@hey.com>
Tested-by: BuildkiteCI

1 files changed, 49 insertions, 11 deletions

diff --git a/tvix/nar-bridge/cmd/nar_bridge/main.go b/tvix/nar-bridge/cmd/nar_bridge/main.go
index 78ed3e272d69..482012f39b5f 100644
--- a/tvix/nar-bridge/cmd/nar_bridge/main.go
+++ b/tvix/nar-bridge/cmd/nar_bridge/main.go
@@ -2,29 +2,67 @@ package main
 
 import (
 	"os"
+	"os/signal"
 
 	"github.com/alecthomas/kong"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+
+	"code.tvl.fyi/tvix/nar-bridge/pkg/server"
+	storev1pb "code.tvl.fyi/tvix/store/protos"
+	"github.com/sirupsen/logrus"
+	log "github.com/sirupsen/logrus"
 )
 
-//nolint:gochecknoglobals
+// `help:"Expose a tvix-store gRPC Interface as HTTP NAR/NARinfo"`
 var cli struct {
-	// TODO: make log level configurable
-	Import ImportCmd `kong:"cmd,name='import',help='Import a local NAR file into a tvix-store'"`
-	Serve  ServeCmd  `kong:"cmd,name='serve',help='Expose a tvix-store RPC interface as NAR/NARInfo'"`
+	LogLevel        string `enum:"trace,debug,info,warn,error,fatal,panic" help:"The log level to log with" default:"info"`
+	ListenAddr      string `name:"listen-addr" help:"The address this service listens on" type:"string" default:"[::]:9000"` //nolint:lll
+	EnableAccessLog bool   `name:"access-log" help:"Enable access logging" type:"bool" default:"true" negatable:""`          //nolint:lll
+	StoreAddr       string `name:"store-addr" help:"The address to the tvix-store RPC interface this will connect to"`
 }
 
 func main() {
-	parser, err := kong.New(&cli)
+	_ = kong.Parse(&cli)
+
+	logLevel, err := logrus.ParseLevel(cli.LogLevel)
 	if err != nil {
-		panic(err)
+		log.Panic("invalid log level")
+		return
 	}
+	logrus.SetLevel(logLevel)
+
+	c := make(chan os.Signal, 1)
+	signal.Notify(c, os.Interrupt)
 
-	ctx, err := parser.Parse(os.Args[1:])
+	go func() {
+		for range c {
+			log.Info("Received Signal, shutting down…")
+			os.Exit(1)
+		}
+	}()
+
+	// connect to tvix-store
+	log.Debugf("Dialing to %v", cli.StoreAddr)
+	conn, err := grpc.Dial(cli.StoreAddr, grpc.WithTransportCredentials(insecure.NewCredentials()))
 	if err != nil {
-		panic(err)
+		log.Fatalf("did not connect: %v", err)
 	}
-	// Call the Run() method of the selected parsed command.
-	err = ctx.Run()
+	defer conn.Close()
+
+	log.Printf("Starting nar-bridge at %v", cli.ListenAddr)
+	s := server.New(
+		storev1pb.NewDirectoryServiceClient(conn),
+		storev1pb.NewBlobServiceClient(conn),
+		storev1pb.NewPathInfoServiceClient(conn),
+		cli.EnableAccessLog,
+		30,
+	)
 
-	ctx.FatalIfErrorf(err)
+	err = s.ListenAndServe(cli.ListenAddr)
+	if err != nil {
+		log.Error("Server failed: %w", err)
+		os.Exit(1)
+	}
 }