Update mailgun library to v4 (#5)

README.md

@@ -18,10 +18,10 @@ Go's client.
 
 ```shell
 docker run -it \
+  -e MG_API_KEY="<MAILGUN_API_KEY> \
+  -e MG_DOMAIN="<domain>" \
+  -e MG_URL="<url>" \
   -e RELAY_ADDR=:25 \
-  -e RELAY_DOMAIN="<domain>" \
-  -e RELAY_MAILGUN_PRIVATE_KEY="<mailgun private key>" \
-  -e RELAY_MAILGUN_PUBLIC_KEY="<mailgun public key>" \
   -e RELAY_MAX_IDLE_SECONDS=300 \
   -e RELAY_MAX_MESSAGE_BYTES=1048576 \
   -e RELAY_MAX_RECIPIENTS=50 \

backend/mailgun/mailgun.go

@@ -1,16 +1,15 @@
 package mailgun
 
 import (
-	"fmt"
+	"context"
 	"io"
-	"io/ioutil"
 	"log"
 	"net/http"
 
 	smtp "github.com/emersion/go-smtp"
+	mg "github.com/mailgun/mailgun-go/v4"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
-	mg "gopkg.in/mailgun/mailgun-go.v1"
 )
 
 var (
@@ -20,28 +19,21 @@ var (
 
 // Backend type
 type Backend struct {
-	Domain                 string
-	privateKey             string
-	publicKey              string
+	mgClient               mg.Mailgun
 	metricsMailgunMessages *prometheus.CounterVec
 }
 
 // User type
 type User struct {
-	mailgunClient          mg.Mailgun
+	mgClient               mg.Mailgun
 	metricsMailgunMessages *prometheus.CounterVec
 }
 
 // NewBackend returns new instance of backend
-func NewBackend(domain, privateKey, publicKey string) (smtp.Backend, error) {
-	if domain == "" || privateKey == "" || publicKey == "" {
-		return nil, fmt.Errorf("domain, privateKey, publicKey must not be empty")
-	}
-
+func NewBackend(cli mg.Mailgun) (smtp.Backend, error) {
 	b := &Backend{
-		Domain:     domain,
-		privateKey: privateKey,
-		publicKey:  publicKey,
+		mgClient: cli,
+
 		metricsMailgunMessages: prometheus.NewCounterVec(
 			prometheus.CounterOpts{
 				Name: "mailgun_messages",
@@ -60,15 +52,15 @@ func NewBackend(domain, privateKey, publicKey string) (smtp.Backend, error) {
 // In relay there's no need for that at the moment
 func (b *Backend) Login(username, password string) (smtp.User, error) {
 	return &User{
-		mailgunClient:          mg.NewMailgun(b.Domain, b.privateKey, b.publicKey),
+		mgClient:               b.mgClient,
 		metricsMailgunMessages: b.metricsMailgunMessages,
 	}, nil
 }
 
 // AnonymousLogin returns anonymouse user object
 func (b *Backend) AnonymousLogin() (smtp.User, error) {
 	return &User{
-		mailgunClient:          mg.NewMailgun(b.Domain, b.privateKey, b.publicKey),
+		mgClient:               b.mgClient,
 		metricsMailgunMessages: b.metricsMailgunMessages,
 	}, nil
 }
@@ -84,8 +76,8 @@ func (b *Backend) ListenAndServeMetrics(addr string) error {
 // Send will send email synchronously via Mailgun service
 func (u *User) Send(from string, to []string, r io.Reader) error {
 	for _, recipient := range to {
-		message := mg.NewMIMEMessage(ioutil.NopCloser(r), recipient)
-		resp, id, err := u.mailgunClient.Send(message)
+		message := u.mgClient.NewMIMEMessage(io.NopCloser(r), recipient)
+		resp, id, err := u.mgClient.Send(context.Background(), message)
 		if err != nil {
 			u.metricsMailgunMessages.WithLabelValues("fail").Inc()
 			return err

cmd/relay/main.go

@@ -5,6 +5,7 @@ import (
 
 	smtp "github.com/emersion/go-smtp"
 	"github.com/kelseyhightower/envconfig"
+	mg "github.com/mailgun/mailgun-go/v4"
 
 	"github.com/teran/relay/backend/mailgun"
 )
@@ -29,11 +30,11 @@ func main() {
 		log.Fatal(err)
 	}
 
-	be, err := mailgun.NewBackend(
-		cfg.Domain,
-		cfg.MailgunPrivateKey,
-		cfg.MailgunPublicKey,
-	)
+	mgDriver, err := mg.NewMailgunFromEnv()
+	if err != nil {
+		panic(err)
+	}
+	be, err := mailgun.NewBackend(mgDriver)
 	if err != nil {
 		log.Fatal(err)
 	}

go.mod

@@ -5,23 +5,25 @@ go 1.22.4
 require (
 	github.com/emersion/go-smtp v0.0.0-20180503081130-592cbda523fa
 	github.com/kelseyhightower/envconfig v1.4.0
+	github.com/mailgun/mailgun-go/v4 v4.12.0
 	github.com/prometheus/client_golang v1.19.1
-	gopkg.in/mailgun/mailgun-go.v1 v1.1.1
 )
 
 require (
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/emersion/go-sasl v0.0.0-20200509203442-7bfe0ed36a21 // indirect
 	github.com/facebookgo/ensure v0.0.0-20200202191622-63f1cf65ac4c // indirect
-	github.com/facebookgo/stack v0.0.0-20160209184415-751773369052 // indirect
 	github.com/facebookgo/subset v0.0.0-20200203212716-c811ad88dec4 // indirect
-	github.com/onsi/ginkgo v1.16.5 // indirect
-	github.com/onsi/gomega v1.33.1 // indirect
+	github.com/go-chi/chi/v5 v5.0.8 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/prometheus/client_model v0.5.0 // indirect
 	github.com/prometheus/common v0.48.0 // indirect
 	github.com/prometheus/procfs v0.12.0 // indirect
+	github.com/stretchr/testify v1.5.1 // indirect
 	golang.org/x/sys v0.19.0 // indirect
 	google.golang.org/protobuf v1.33.0 // indirect
 )

go.sum

@@ -9,44 +9,36 @@ github.com/emersion/go-sasl v0.0.0-20200509203442-7bfe0ed36a21 h1:OJyUGMJTzHTd1X
 github.com/emersion/go-sasl v0.0.0-20200509203442-7bfe0ed36a21/go.mod h1:iL2twTeMvZnrg54ZoPDNfJaJaqy0xIQFuBdrLsmspwQ=
 github.com/emersion/go-smtp v0.0.0-20180503081130-592cbda523fa h1:PrdqhTPR+t5QXXTb3zk0ziVbVnufcI/BRtezVyVaRdA=
 github.com/emersion/go-smtp v0.0.0-20180503081130-592cbda523fa/go.mod h1:pWTu8vaUWw7VstSr/kt92tqtcF46ynjh5BUvQRRjHvI=
+github.com/facebookgo/ensure v0.0.0-20160127193407-b4ab57deab51/go.mod h1:Yg+htXGokKKdzcwhuNDwVvN+uBxDGXJ7G/VN1d8fa64=
 github.com/facebookgo/ensure v0.0.0-20200202191622-63f1cf65ac4c h1:8ISkoahWXwZR41ois5lSJBSVw4D0OV19Ht/JSTzvSv0=
 github.com/facebookgo/ensure v0.0.0-20200202191622-63f1cf65ac4c/go.mod h1:Yg+htXGokKKdzcwhuNDwVvN+uBxDGXJ7G/VN1d8fa64=
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 github.com/facebookgo/subset v0.0.0-20200203212716-c811ad88dec4/go.mod h1:5tD+neXqOorC30/tWg0LCSkrqj/AR6gu8yY8/fpw1q0=
-github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
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+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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@@ -57,60 +49,14 @@ github.com/prometheus/common v0.48.0/go.mod h1:0/KsvlIEfPQCQ5I2iNSAWKPZziNCvRs5E
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