/
ses.go
168 lines (138 loc) · 3.25 KB
/
ses.go
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package logrus_ses
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"net/mail"
"net/smtp"
"os"
"strconv"
log "github.com/Sirupsen/logrus"
)
const (
SESServer = "email-smtp.us-east-1.amazonaws.com"
SESPort = 587
)
var (
SESServerAddr = SESServer + ":" + strconv.Itoa(SESPort)
JSONFormatter = &log.JSONFormatter{}
getUsername = func() string {
return os.Getenv("SES_ACCESS_KEY_ID")
}
getPassword = func() string {
return os.Getenv("SES_SECRET_ACCESS_KEY")
}
getHostname = func() string {
return os.Getenv("EXTERNAL_DOMAIN")
}
getIP = func() string {
return os.Getenv("EXTERNAL_IP")
}
getFrom = func() string {
return os.Getenv("SES_LOG_NOTIFICATION_FROM")
}
getTo = func() string {
return os.Getenv("SES_LOG_NOTIFICATION_TO")
}
)
// SESHook to sends logs by email with AWS SES.
type SESHook struct {
log.Hook
// AppName is the application name of the log
AppName string
// From and to of the envelope
From *mail.Address
To *mail.Address
// SES authentication
Auth smtp.Auth
// Level above this (including this level) message will trigger
// the hook.
Level log.Level
}
// NewSESHook creates a hook to be added to an instance of logger.
func NewSESHook(appName string, level log.Level) (*SESHook, error) {
// Validate sender and recipient
sender, err := mail.ParseAddress(getFrom())
if err != nil {
return nil, err
}
receiver, err := mail.ParseAddress(getTo())
if err != nil {
return nil, err
}
// Get SES specific username and password
username := getUsername()
if len(username) == 0 {
return nil, errors.New("SES_ACCESS_KEY_ID not set.")
}
password := getPassword()
if len(password) == 0 {
return nil, errors.New("SES_SECRET_ACCESS_KEY not set.")
}
return &SESHook{
AppName: appName,
From: sender,
To: receiver,
Auth: smtp.PlainAuth("", username, password, SESServer),
Level: level,
}, nil
}
// Fire is called when a log event is fired.
func (hook *SESHook) Fire(entry *log.Entry) error {
message := hook.createMessage(entry)
// Connect to the server, authenticate, set the sender and recipient,
// and send the email all in one step.
err := smtp.SendMail(
SESServerAddr,
hook.Auth,
hook.From.Address,
[]string{hook.To.Address},
message,
)
if err != nil {
return err
}
return nil
}
// Levels returns the available logging levels.
func (hook *SESHook) Levels() (levels []log.Level) {
for _, l := range []log.Level{
log.PanicLevel,
log.FatalLevel,
log.ErrorLevel,
log.WarnLevel,
log.InfoLevel,
log.DebugLevel,
} {
// PanicLevel is 0 and it goes up.
if l <= hook.Level {
levels = append(levels, l)
}
}
return
}
const template = `Subject: [%s][%s] %s on %s ( %s )
Log entry:
%s
--
From %s with love.
`
func getEntry(entry *log.Entry) []byte {
buf := new(bytes.Buffer)
logBuf, err := JSONFormatter.Format(entry)
if err != nil {
fmt.Fprintf(buf, "Failed to format log entry correctly.\n"+
" Please check the log file on server.")
} else {
json.Indent(buf, logBuf, "", "\t")
}
return buf.Bytes()
}
func (hook *SESHook) createMessage(entry *log.Entry) []byte {
message := new(bytes.Buffer)
fmt.Fprintf(message, template, entry.Time, entry.Level.String(),
hook.AppName, getHostname(), getIP(), getEntry(entry),
hook.AppName)
return message.Bytes()
}