mirror of
https://github.com/wneessen/go-mail.git
synced 2024-11-08 23:12:54 +01:00
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
|
@ -130,6 +130,9 @@ type Client struct {
|
|||
|
||||
// user is the SMTP AUTH username
|
||||
user string
|
||||
|
||||
// dl enables the debug logging on the SMTP client
|
||||
dl bool
|
||||
}
|
||||
|
||||
// Option returns a function that can be used for grouping Client options
|
||||
|
@ -240,6 +243,15 @@ func WithSSL() Option {
|
|||
}
|
||||
}
|
||||
|
||||
// WithDebugLog tells the client to log incoming and outgoing messages of the SMTP client
|
||||
// to StdErr
|
||||
func WithDebugLog() Option {
|
||||
return func(c *Client) error {
|
||||
c.dl = true
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
// WithHELO tells the client to use the provided string as HELO/EHLO greeting host
|
||||
func WithHELO(h string) Option {
|
||||
return func(c *Client) error {
|
||||
|
@ -397,6 +409,11 @@ func (c *Client) SetSSL(s bool) {
|
|||
c.ssl = s
|
||||
}
|
||||
|
||||
// SetDebugLog tells the Client whether debug logging is enabled or not
|
||||
func (c *Client) SetDebugLog(s bool) {
|
||||
c.dl = s
|
||||
}
|
||||
|
||||
// SetTLSConfig overrides the current *tls.Config with the given *tls.Config value
|
||||
func (c *Client) SetTLSConfig(co *tls.Config) error {
|
||||
if co == nil {
|
||||
|
@ -461,6 +478,9 @@ func (c *Client) DialWithContext(pc context.Context) error {
|
|||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if c.dl {
|
||||
c.sc.SetDebugLog()
|
||||
}
|
||||
if err := c.sc.Hello(c.helo); err != nil {
|
||||
return err
|
||||
}
|
||||
|
|
|
@ -105,6 +105,7 @@ func TestNewClientWithOptions(t *testing.T) {
|
|||
{"WithDSNRcptNotifyType()", WithDSNRcptNotifyType(DSNRcptNotifySuccess), false},
|
||||
{"WithDSNRcptNotifyType() wrong option", WithDSNRcptNotifyType("FAIL"), true},
|
||||
{"WithoutNoop()", WithoutNoop(), false},
|
||||
{"WithDebugLog()", WithDebugLog(), false},
|
||||
|
||||
{
|
||||
"WithDSNRcptNotifyType() NEVER combination",
|
||||
|
@ -542,6 +543,30 @@ func TestClient_DialWithContext(t *testing.T) {
|
|||
}
|
||||
}
|
||||
|
||||
// TestClient_DialWithContext_Debug tests the DialWithContext method for the Client object with debug
|
||||
// logging enabled on the SMTP client
|
||||
func TestClient_DialWithContext_Debug(t *testing.T) {
|
||||
c, err := getTestConnection(true)
|
||||
if err != nil {
|
||||
t.Skipf("failed to create test client: %s. Skipping tests", err)
|
||||
}
|
||||
c.SetDebugLog(true)
|
||||
ctx := context.Background()
|
||||
if err := c.DialWithContext(ctx); err != nil {
|
||||
t.Errorf("failed to dial with context: %s", err)
|
||||
return
|
||||
}
|
||||
if c.co == nil {
|
||||
t.Errorf("DialWithContext didn't fail but no connection found.")
|
||||
}
|
||||
if c.sc == nil {
|
||||
t.Errorf("DialWithContext didn't fail but no SMTP client found.")
|
||||
}
|
||||
if err := c.Close(); err != nil {
|
||||
t.Errorf("failed to close connection: %s", err)
|
||||
}
|
||||
}
|
||||
|
||||
// TestClient_DialWithContextInvalidHost tests the DialWithContext method with intentional breaking
|
||||
// for the Client object
|
||||
func TestClient_DialWithContextInvalidHost(t *testing.T) {
|
||||
|
@ -1087,7 +1112,6 @@ func getTestConnection(auth bool) (*Client, error) {
|
|||
if th == "" {
|
||||
return nil, fmt.Errorf("no TEST_HOST set")
|
||||
}
|
||||
fmt.Printf("XXX: TEST_HOST: %s\n", th)
|
||||
tp := 25
|
||||
if tps := os.Getenv("TEST_PORT"); tps != "" {
|
||||
tpi, err := strconv.Atoi(tps)
|
||||
|
|
34
smtp/smtp.go
34
smtp/smtp.go
|
@ -32,8 +32,10 @@ import (
|
|||
"errors"
|
||||
"fmt"
|
||||
"io"
|
||||
"log"
|
||||
"net"
|
||||
"net/textproto"
|
||||
"os"
|
||||
"strings"
|
||||
)
|
||||
|
||||
|
@ -55,8 +57,19 @@ type Client struct {
|
|||
localName string // the name to use in HELO/EHLO
|
||||
didHello bool // whether we've said HELO/EHLO
|
||||
helloError error // the error from the hello
|
||||
|
||||
debug bool // debug logging is enabled
|
||||
logger *log.Logger // logger will be used for debug logging
|
||||
}
|
||||
|
||||
// logDirection is a type wrapper for the direction a debug log message goes
|
||||
type logDirection int
|
||||
|
||||
const (
|
||||
logIn logDirection = iota // Incoming log message
|
||||
logOut // Outgoing log message
|
||||
)
|
||||
|
||||
// Dial returns a new Client connected to an SMTP server at addr.
|
||||
// The addr must include a port, as in "mail.example.com:smtp".
|
||||
func Dial(addr string) (*Client, error) {
|
||||
|
@ -81,6 +94,7 @@ func NewClient(conn net.Conn, host string) (*Client, error) {
|
|||
}
|
||||
c := &Client{Text: text, conn: conn, serverName: host, localName: "localhost"}
|
||||
_, c.tls = conn.(*tls.Conn)
|
||||
|
||||
return c, nil
|
||||
}
|
||||
|
||||
|
@ -119,6 +133,7 @@ func (c *Client) Hello(localName string) error {
|
|||
|
||||
// cmd is a convenience function that sends a command and returns the response
|
||||
func (c *Client) cmd(expectCode int, format string, args ...interface{}) (int, string, error) {
|
||||
c.debugLog(logOut, format, args...)
|
||||
id, err := c.Text.Cmd(format, args...)
|
||||
if err != nil {
|
||||
return 0, "", err
|
||||
|
@ -126,6 +141,7 @@ func (c *Client) cmd(expectCode int, format string, args ...interface{}) (int, s
|
|||
c.Text.StartResponse(id)
|
||||
defer c.Text.EndResponse(id)
|
||||
code, msg, err := c.Text.ReadResponse(expectCode)
|
||||
c.debugLog(logIn, "%d %s", code, msg)
|
||||
return code, msg, err
|
||||
}
|
||||
|
||||
|
@ -415,6 +431,24 @@ func (c *Client) Quit() error {
|
|||
return c.Text.Close()
|
||||
}
|
||||
|
||||
// SetDebugLog enables the debug logging for incoming and outgoing SMTP messages
|
||||
func (c *Client) SetDebugLog() {
|
||||
c.debug = true
|
||||
c.logger = log.New(os.Stderr, "[DEBUG] ", log.LstdFlags|log.Lmsgprefix)
|
||||
}
|
||||
|
||||
// debugLog checks if the debug flag is set and if so logs the provided message to StdErr
|
||||
func (c *Client) debugLog(d logDirection, f string, a ...interface{}) {
|
||||
if c.debug {
|
||||
p := "S <-- C:"
|
||||
if d == logOut {
|
||||
p = "C --> S:"
|
||||
}
|
||||
fs := fmt.Sprintf("%s %s", p, f)
|
||||
c.logger.Printf(fs, a...)
|
||||
}
|
||||
}
|
||||
|
||||
// validateLine checks to see if a line has CR or LF as per RFC 5321.
|
||||
func validateLine(line string) error {
|
||||
if strings.ContainsAny(line, "\n\r") {
|
||||
|
|
|
@ -633,6 +633,34 @@ func TestNewClient(t *testing.T) {
|
|||
}
|
||||
}
|
||||
|
||||
// TestClient_SetDebugLog tests the Client method with the Client.SetDebugLog method
|
||||
// to enable debug logging
|
||||
func TestClient_SetDebugLog(t *testing.T) {
|
||||
server := strings.Join(strings.Split(newClientServer, "\n"), "\r\n")
|
||||
|
||||
var cmdbuf strings.Builder
|
||||
bcmdbuf := bufio.NewWriter(&cmdbuf)
|
||||
out := func() string {
|
||||
if err := bcmdbuf.Flush(); err != nil {
|
||||
t.Errorf("failed to flush: %s", err)
|
||||
}
|
||||
return cmdbuf.String()
|
||||
}
|
||||
var fake faker
|
||||
fake.ReadWriter = bufio.NewReadWriter(bufio.NewReader(strings.NewReader(server)), bcmdbuf)
|
||||
c, err := NewClient(fake, "fake.host")
|
||||
if err != nil {
|
||||
t.Fatalf("NewClient: %v\n(after %v)", err, out())
|
||||
}
|
||||
defer func() {
|
||||
_ = c.Close()
|
||||
}()
|
||||
c.SetDebugLog()
|
||||
if !c.debug {
|
||||
t.Errorf("Expected DebugLog flag to be true but received false")
|
||||
}
|
||||
}
|
||||
|
||||
var newClientServer = `220 hello world
|
||||
250-mx.google.com at your service
|
||||
250-SIZE 35651584
|
||||
|
|
Loading…
Reference in a new issue