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https://github.com/wneessen/go-mail.git
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Implement debug logging in SMTP client
Resolves #101. Since we now have full control over the SMTP client we can also access the message input and output. This PR introduces a new debug logging feature. Via the `Client.WithDebugLog` the user can enable this feature. It will then make use of the new `smtp/Client.SetDebugLog` method. Once the flag is set to true, the SMTP client will start logging incoming and outgoing messages to os.Stderr. Log directions will be output accordingly
This commit is contained in:
parent
813020f02d
commit
34b432a985
4 changed files with 107 additions and 1 deletions
20
client.go
20
client.go
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@ -130,6 +130,9 @@ type Client struct {
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// user is the SMTP AUTH username
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user string
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// dl enables the debug logging on the SMTP client
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dl bool
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}
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// Option returns a function that can be used for grouping Client options
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@ -240,6 +243,15 @@ func WithSSL() Option {
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}
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}
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// WithDebugLog tells the client to log incoming and outgoing messages of the SMTP client
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// to StdErr
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func WithDebugLog() Option {
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return func(c *Client) error {
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c.dl = true
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return nil
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}
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}
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// WithHELO tells the client to use the provided string as HELO/EHLO greeting host
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func WithHELO(h string) Option {
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return func(c *Client) error {
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@ -397,6 +409,11 @@ func (c *Client) SetSSL(s bool) {
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c.ssl = s
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}
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// SetDebugLog tells the Client whether debug logging is enabled or not
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func (c *Client) SetDebugLog(s bool) {
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c.dl = s
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}
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// SetTLSConfig overrides the current *tls.Config with the given *tls.Config value
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func (c *Client) SetTLSConfig(co *tls.Config) error {
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if co == nil {
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@ -461,6 +478,9 @@ func (c *Client) DialWithContext(pc context.Context) error {
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if err != nil {
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return err
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}
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if c.dl {
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c.sc.SetDebugLog()
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}
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if err := c.sc.Hello(c.helo); err != nil {
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return err
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}
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@ -105,6 +105,7 @@ func TestNewClientWithOptions(t *testing.T) {
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{"WithDSNRcptNotifyType()", WithDSNRcptNotifyType(DSNRcptNotifySuccess), false},
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{"WithDSNRcptNotifyType() wrong option", WithDSNRcptNotifyType("FAIL"), true},
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{"WithoutNoop()", WithoutNoop(), false},
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{"WithDebugLog()", WithDebugLog(), false},
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{
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"WithDSNRcptNotifyType() NEVER combination",
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@ -542,6 +543,30 @@ func TestClient_DialWithContext(t *testing.T) {
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}
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}
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// TestClient_DialWithContext_Debug tests the DialWithContext method for the Client object with debug
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// logging enabled on the SMTP client
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func TestClient_DialWithContext_Debug(t *testing.T) {
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c, err := getTestConnection(true)
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if err != nil {
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t.Skipf("failed to create test client: %s. Skipping tests", err)
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}
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c.SetDebugLog(true)
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ctx := context.Background()
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if err := c.DialWithContext(ctx); err != nil {
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t.Errorf("failed to dial with context: %s", err)
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return
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}
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if c.co == nil {
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t.Errorf("DialWithContext didn't fail but no connection found.")
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}
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if c.sc == nil {
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t.Errorf("DialWithContext didn't fail but no SMTP client found.")
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}
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if err := c.Close(); err != nil {
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t.Errorf("failed to close connection: %s", err)
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}
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}
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// TestClient_DialWithContextInvalidHost tests the DialWithContext method with intentional breaking
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// for the Client object
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func TestClient_DialWithContextInvalidHost(t *testing.T) {
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@ -1087,7 +1112,6 @@ func getTestConnection(auth bool) (*Client, error) {
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if th == "" {
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return nil, fmt.Errorf("no TEST_HOST set")
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}
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fmt.Printf("XXX: TEST_HOST: %s\n", th)
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tp := 25
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if tps := os.Getenv("TEST_PORT"); tps != "" {
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tpi, err := strconv.Atoi(tps)
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34
smtp/smtp.go
34
smtp/smtp.go
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@ -32,8 +32,10 @@ import (
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"errors"
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"fmt"
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"io"
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"log"
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"net"
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"net/textproto"
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"os"
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"strings"
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)
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@ -55,8 +57,19 @@ type Client struct {
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localName string // the name to use in HELO/EHLO
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didHello bool // whether we've said HELO/EHLO
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helloError error // the error from the hello
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debug bool // debug logging is enabled
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logger *log.Logger // logger will be used for debug logging
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}
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// logDirection is a type wrapper for the direction a debug log message goes
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type logDirection int
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const (
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logIn logDirection = iota // Incoming log message
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logOut // Outgoing log message
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)
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// Dial returns a new Client connected to an SMTP server at addr.
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// The addr must include a port, as in "mail.example.com:smtp".
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func Dial(addr string) (*Client, error) {
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@ -81,6 +94,7 @@ func NewClient(conn net.Conn, host string) (*Client, error) {
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}
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c := &Client{Text: text, conn: conn, serverName: host, localName: "localhost"}
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_, c.tls = conn.(*tls.Conn)
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return c, nil
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}
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@ -119,6 +133,7 @@ func (c *Client) Hello(localName string) error {
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// cmd is a convenience function that sends a command and returns the response
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func (c *Client) cmd(expectCode int, format string, args ...interface{}) (int, string, error) {
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c.debugLog(logOut, format, args...)
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id, err := c.Text.Cmd(format, args...)
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if err != nil {
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return 0, "", err
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@ -126,6 +141,7 @@ func (c *Client) cmd(expectCode int, format string, args ...interface{}) (int, s
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c.Text.StartResponse(id)
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defer c.Text.EndResponse(id)
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code, msg, err := c.Text.ReadResponse(expectCode)
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c.debugLog(logIn, "%d %s", code, msg)
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return code, msg, err
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}
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@ -415,6 +431,24 @@ func (c *Client) Quit() error {
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return c.Text.Close()
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}
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// SetDebugLog enables the debug logging for incoming and outgoing SMTP messages
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func (c *Client) SetDebugLog() {
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c.debug = true
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c.logger = log.New(os.Stderr, "[DEBUG] ", log.LstdFlags|log.Lmsgprefix)
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}
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// debugLog checks if the debug flag is set and if so logs the provided message to StdErr
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func (c *Client) debugLog(d logDirection, f string, a ...interface{}) {
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if c.debug {
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p := "S <-- C:"
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if d == logOut {
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p = "C --> S:"
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}
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fs := fmt.Sprintf("%s %s", p, f)
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c.logger.Printf(fs, a...)
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}
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}
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// validateLine checks to see if a line has CR or LF as per RFC 5321.
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func validateLine(line string) error {
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if strings.ContainsAny(line, "\n\r") {
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@ -633,6 +633,34 @@ func TestNewClient(t *testing.T) {
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}
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}
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// TestClient_SetDebugLog tests the Client method with the Client.SetDebugLog method
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// to enable debug logging
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func TestClient_SetDebugLog(t *testing.T) {
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server := strings.Join(strings.Split(newClientServer, "\n"), "\r\n")
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var cmdbuf strings.Builder
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bcmdbuf := bufio.NewWriter(&cmdbuf)
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out := func() string {
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if err := bcmdbuf.Flush(); err != nil {
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t.Errorf("failed to flush: %s", err)
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}
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return cmdbuf.String()
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}
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var fake faker
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fake.ReadWriter = bufio.NewReadWriter(bufio.NewReader(strings.NewReader(server)), bcmdbuf)
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c, err := NewClient(fake, "fake.host")
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if err != nil {
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t.Fatalf("NewClient: %v\n(after %v)", err, out())
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}
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defer func() {
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_ = c.Close()
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}()
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c.SetDebugLog()
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if !c.debug {
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t.Errorf("Expected DebugLog flag to be true but received false")
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}
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}
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var newClientServer = `220 hello world
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250-mx.google.com at your service
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250-SIZE 35651584
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