Upgrade to golang 1.20 (#633)

* Upgrade to golang 1.20

* Fix golangci-lint issues. Pins the grpc reflection client to v1alpha1. Probably a future issue to upgrade that

* go mod tidy

---------

Co-authored-by: ktr0731 <ktr@syfm.me>

.github/workflows/main.yml

@@ -7,7 +7,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macOS-latest]
-        go: ['1.17']
+        go: ['1.20']
     steps:
     - name: Set up Go ${{ matrix.go }}
       uses: actions/setup-go@v3

Dockerfile

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1.2
 
 # Image page: <https://hub.docker.com/_/golang>
-FROM golang:1.18-alpine as builder
+FROM golang:1.20-alpine as builder
 
 WORKDIR /src
 

README.md

@@ -97,7 +97,7 @@ $ docker run --rm -v "$(pwd):/mount:ro" \
 
 ### **[Not-recommended]** go install
 
-Go v1.16 or later is required.  
+Go v1.20 or later is required.  
 
 ``` sh
 go install github.com/ktr0731/evans@latest

go.mod

@@ -1,6 +1,6 @@
 module github.com/ktr0731/evans
 
-go 1.17
+go 1.20
 
 require (
 	github.com/Songmu/gocredits v0.3.0

grpc/grpc.go

@@ -19,6 +19,7 @@ import (
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/credentials/insecure"
 	"google.golang.org/grpc/metadata"
 )
 
@@ -117,7 +118,7 @@ type client struct {
 func NewClient(addr, serverName string, useReflection, useTLS bool, cacert, cert, certKey string, headers map[string][]string) (Client, error) {
 	var opts []grpc.DialOption
 	if !useTLS {
-		opts = append(opts, grpc.WithInsecure())
+		opts = append(opts, grpc.WithTransportCredentials(insecure.NewCredentials()))
 	} else { // Enable TLS authentication
 		var tlsCfg tls.Config
 		if cacert != "" {
@@ -143,12 +144,11 @@ func NewClient(addr, serverName string, useReflection, useTLS bool, cacert, cert
 		}
 
 		creds := credentials.NewTLS(&tlsCfg)
+		opts = append(opts, grpc.WithTransportCredentials(creds))
+
 		if serverName != "" {
-			if err := creds.OverrideServerName(serverName); err != nil {
-				return nil, errors.Wrapf(err, "failed to override the server name by '%s'", serverName)
-			}
+			opts = append(opts, grpc.WithAuthority(serverName))
 		}
-		opts = append(opts, grpc.WithTransportCredentials(creds))
 	}
 	ctx, cancel := context.WithTimeout(context.Background(), 7*time.Second)
 	defer cancel()

grpc/grpcreflection/reflection.go

@@ -47,14 +47,14 @@ func getCtx(headers map[string][]string) context.Context {
 // NewClient returns an instance of gRPC reflection client for gRPC protocol.
 func NewClient(conn grpc.ClientConnInterface, headers map[string][]string) Client {
 	return &client{
-		client: gr.NewClient(getCtx(headers), grpc_reflection_v1alpha.NewServerReflectionClient(conn)),
+		client: gr.NewClientV1Alpha(getCtx(headers), grpc_reflection_v1alpha.NewServerReflectionClient(conn)),
 	}
 }
 
 // NewWebClient returns an instance of gRPC reflection client for gRPC-Web protocol.
 func NewWebClient(conn *grpcweb.ClientConn, headers map[string][]string) Client {
 	return &client{
-		client: gr.NewClient(getCtx(headers), grpcweb_reflection_v1alpha.NewServerReflectionClient(conn)),
+		client: gr.NewClientV1Alpha(getCtx(headers), grpcweb_reflection_v1alpha.NewServerReflectionClient(conn)),
 	}
 }