Move ACME logger setup to cmd/tlstunnel

This will allow us to customize the logger options depending on CLI
flags.

cmd/tlstunnel/main.go

@@ -7,6 +7,7 @@ import (
 	"git.sr.ht/~emersion/go-scfg"
 	"git.sr.ht/~emersion/tlstunnel"
 	"github.com/caddyserver/certmagic"
+	"go.uber.org/zap"
 )
 
 var (
@@ -25,6 +26,22 @@ func main() {
 
 	srv := tlstunnel.NewServer()
 
+	loggerCfg := zap.Config{
+		Level:             zap.NewAtomicLevelAt(zap.InfoLevel),
+		Encoding:          "console",
+		EncoderConfig:     zap.NewDevelopmentEncoderConfig(),
+		OutputPaths:       []string{"stderr"},
+		ErrorOutputPaths:  []string{"stderr"},
+		DisableStacktrace: true,
+		DisableCaller:     true,
+	}
+	logger, err := loggerCfg.Build()
+	if err != nil {
+		log.Fatalf("failed to initialize zap logger: %v", err)
+	}
+	srv.ACMEConfig.Logger = logger
+	srv.ACMEManager.Logger = logger
+
 	if certDataPath != "" {
 		srv.ACMEConfig.Storage = &certmagic.FileStorage{Path: certDataPath}
 	}

server.go

@@ -13,7 +13,6 @@ import (
 	"github.com/caddyserver/certmagic"
 	"github.com/pires/go-proxyproto"
 	"github.com/pires/go-proxyproto/tlvparse"
-	"go.uber.org/zap"
 )
 
 type Server struct {
@@ -37,22 +36,6 @@ func NewServer() *Server {
 	cfg.Issuer = mgr
 	cfg.Revoker = mgr
 
-	loggerCfg := zap.Config{
-		Level:             zap.NewAtomicLevelAt(zap.InfoLevel),
-		Encoding:          "console",
-		EncoderConfig:     zap.NewDevelopmentEncoderConfig(),
-		OutputPaths:       []string{"stderr"},
-		ErrorOutputPaths:  []string{"stderr"},
-		DisableStacktrace: true,
-		DisableCaller:     true,
-	}
-	logger, err := loggerCfg.Build()
-	if err != nil {
-		log.Fatalf("failed to initialize zap logger: %v", err)
-	}
-	cfg.Logger = logger
-	mgr.Logger = logger
-
 	return &Server{
 		Listeners:   make(map[string]*Listener),
 		ACMEManager: mgr,