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main.go
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main.go
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package main
import (
glog "birnenlabs.com/go/lib/alog"
"birnenlabs.com/go/lib/conf"
"birnenlabs.com/go/lib/mailgun"
"flag"
"fmt"
"strings"
"time"
)
const appName = "mail_error_check"
const oneMonth = 30 * 24 * 3600
type State struct {
LastRun int64
}
var dryRun = flag.Bool("dryrun", false, "Dry run")
var minutes = flag.Int("minutes", 0, "Overwrite default time range with [now-minutes, now].")
func main() {
flag.Parse()
flag.Set("alsologtostderr", "true")
defer glog.Flush()
glog.UseFormattedPayload(appName)
glog.Infof("Dry run mode: %v", *dryRun)
glog.Infof("Creating new mailgun instance")
m, err := mailgun.New()
if err != nil {
glog.Exit("Could not create mailgun instance:", err)
}
// Load configuration
var state State
err = conf.LoadConfigFromFile(appName, &state)
if err != nil {
// Not exiting here, let's just read all messages
glog.Warningf("Last run time not found (%s). Listing all messages.", err)
}
// Load rules
var config Config
err = conf.LoadConfigFromJson(appName, &config)
if err != nil {
// Not exiting here, let's just read all messages
glog.Warningf("Could not load config: %v.", err)
}
now := time.Now().Unix()
from := max(state.LastRun, now-oneMonth)
if *minutes > 0 {
from = now - (int64)((*minutes)*60)
}
err = processEvents(m, config.Rules, from, now)
if err != nil {
glog.Exit("Could not process our emails", err)
}
state.LastRun = now
if *dryRun {
glog.Infof("DRY RUN: would save state: %+v", state)
} else {
err = conf.SaveConfigToFile(appName, &state)
if err != nil {
glog.Errorf("Could not save last run time to file: %s", err)
}
}
// now/60 == minutes from epoch
// 24 *60 == minutes in day
if (now/60)%(24*60) < 10 {
// Send cloud message only between 0:00 and 0:09
glog.InfoSend("Done")
}
}
func processEvents(m *mailgun.Mailgun, rules []Rule, begin, end int64) error {
glog.Infof("Processing emails between %d and %d", begin, end)
items, err := m.ListAllEvents(begin, end)
if err != nil {
return err
}
for _, item := range items {
matched := false
for _, rule := range rules {
if matches(item, rule.Match) {
glog.Infof("Match %s->%s: %v -> %v", item.From(), item.To(), rule.Match, rule.Action)
matched = true
if rule.Action.NotifyPostmaster {
email := mailgun.Email{
From: m.MailerDaemon(),
To: m.CreateAddress("postmaster"),
Text: generateBounceEmailText(item),
Subject: "Re: " + item.Message.Headers.Subject,
References: "<" + item.Message.Headers.MessageId + ">",
InReplyTo: "<" + item.Message.Headers.MessageId + ">",
}
if *dryRun {
glog.Infof("DRY RUN: would send email")
glog.V(3).Infof("%+v", email)
} else {
err = m.SendBounceEmail(email, item.To() /*failedRecipient*/)
if err != nil {
return err
}
}
}
if rule.Action.Bounce {
email := mailgun.Email{
From: m.MailerDaemon(),
To: item.From(),
Text: generateBounceEmailText(item),
Subject: "Re: " + item.Message.Headers.Subject,
References: "<" + item.Message.Headers.MessageId + ">",
InReplyTo: "<" + item.Message.Headers.MessageId + ">",
}
if *dryRun {
glog.Infof("DRY RUN: would send email")
glog.V(3).Infof("%+v", email)
} else {
err = m.SendBounceEmail(email, item.To() /*failedRecipient*/)
if err != nil {
return err
}
}
}
if len(rule.Action.ForwardTo) > 0 {
if *dryRun {
glog.Infof("DRY RUN: would forward email.")
glog.V(3).Infof("%+v", item)
} else {
err = m.Forward(item.Storage.Key, rule.Action.ForwardTo)
if err != nil {
glog.Errorf("Could not forward email: %v", err)
}
}
}
if rule.Action.StopProcessing {
break
}
}
}
if !matched {
glog.V(1).Infof("Not matched %s->%s", item.From(), item.To())
}
}
return nil
}
func generateBounceEmailText(item mailgun.Item) string {
result := fmt.Sprintf("Mail Status: %s %s\n\nThis is an automatically generated Delivery Status Notification.\n\n", strings.Title(item.Event), strings.Title(item.Severity))
switch item.Event {
case "delivered":
result = result + fmt.Sprintf("The following message was delivered after %d attempts:\n\n", item.DeliveryStatus.AttemptNo)
case "failed":
if item.Severity == "temporary" {
result = result + "THIS IS A WARNING MESSAGE ONLY.\nYOU DO NOT NEED TO RESEND YOUR MESSAGE.\nSERVER WILL RETRY FOR THE NEXT 12 HOURS.\n\n"
result = result + fmt.Sprintf("Delivery of the following message has been delayed:\n\n")
} else {
result = result + fmt.Sprintf("Delivery of the following message failed permanently after %d attempts:\n\n", item.DeliveryStatus.AttemptNo)
}
default:
result = result + fmt.Sprintf("The following message has status: %s:\n\n", item.Event)
}
result = result + fmt.Sprintf("\tFrom: %s\n\tTo: %s\n\n", item.From(), item.To())
result = result + fmt.Sprintf("Technical details:\n-- \nTimestamp: %s\nSeverity: %s\nSMTP code: %d\nReason: %s\n\n", time.Unix(int64(item.Timestamp), 0).UTC(), item.Severity, item.DeliveryStatus.Code, item.Reason)
if len(item.DeliveryStatus.Message) > 0 {
result = result + item.DeliveryStatus.Message + "\n\n"
}
if len(item.DeliveryStatus.Description) > 0 && item.DeliveryStatus.Message != item.DeliveryStatus.Description {
result = result + item.DeliveryStatus.Description + "\n\n"
}
return result
}
func max(x, y int64) int64 {
if x > y {
return x
}
return y
}