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/
main.go
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/
main.go
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package main
import (
"bufio"
"bytes"
"context"
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"net/http"
"strings"
"time"
"golang.org/x/crypto/ssh"
"github.com/go-ini/ini"
"github.com/nlopes/slack"
lumberjack "gopkg.in/natefinch/lumberjack.v2"
"github.com/levenlabs/gerrit-slack/events"
"github.com/levenlabs/gerrit-slack/gerritssh"
"github.com/levenlabs/gerrit-slack/project"
"github.com/andygrunwald/go-gerrit"
"github.com/levenlabs/go-llog"
)
var sshRetryDelay = 3 * time.Second
type config struct {
HTTPAddress string `ini:"http-address"`
SSHAddress string `ini:"ssh-address"`
Username string `ini:"username"`
Password string `ini:"password"`
PrivateKeyPath string `ini:"private-key-path"`
HostKey string `ini:"host-key"`
DebugEvents string `ini:"debug-events"`
SlackToken string `ini:"slack-token"`
}
func main() {
cp := flag.String("config", "./slack.config", "path to ini-formatted config file")
ll := flag.String("log-level", "info", "the log level to set on llog")
flag.Parse()
err := llog.SetLevelFromString(*ll)
if err != nil {
llog.Fatal("invalid log-level", llog.ErrKV(err))
}
var cfg config
f, err := ini.Load(*cp)
if err != nil {
llog.Fatal("error reading config file", llog.ErrKV(err), llog.KV{"path": *cp})
}
if err := f.Section("gerrit").MapTo(&cfg); err != nil {
llog.Fatal("error parsing config", llog.ErrKV(err), llog.KV{"path": *cp})
}
client, err := gerrit.NewClient(cfg.HTTPAddress, nil)
if err != nil {
llog.Fatal("error creating gerrit client", llog.ErrKV(err))
}
client.Authentication.SetBasicAuth(cfg.Username, cfg.Password)
// make sure that the client works
if _, _, err := client.Accounts.GetAccount("self"); err != nil {
llog.Fatal("error validating gerrit client", llog.ErrKV(err))
}
llog.Info("connected to rest api")
pk, err := ioutil.ReadFile(cfg.PrivateKeyPath)
if err != nil {
llog.Fatal("unable to read private key", llog.ErrKV(err))
}
sshc, err := gerritssh.NewClient(cfg.SSHAddress, cfg.Username, pk, []byte(cfg.HostKey))
if err != nil {
llog.Fatal("error creating ssh client", llog.ErrKV(err))
}
if cfg.DebugEvents != "" {
llog.Info("debugging events")
go debugEvents(cfg.DebugEvents, sshc)
}
// add a buffer so we don't overflow the ssh buffer trying to handle/submit
sch := make(chan webhookSubmit, 10)
go webhookSubmitter(sch)
ech := make(chan gerritssh.Event, 10)
go listenForEvents(client, ech, sch, cfg.SlackToken)
llog.Info("streaming events")
for {
if err := sshc.StreamEvents(context.Background(), ech); err != nil {
llog.Error("error streaming events", llog.ErrKV(err))
}
time.Sleep(sshRetryDelay)
}
}
// SlackState holds various slack metadata that can be used to improve messages
type slackState struct {
emailToID map[string]string
refreshed time.Time
sapi *slack.Client
}
func (s *slackState) refresh() error {
if s.sapi == nil {
return nil
}
us, err := s.sapi.GetUsers()
if err != nil {
return err
}
emailToID := map[string]string{}
for _, u := range us {
if u.Profile.Email != "" {
emailToID[strings.ToLower(u.Profile.Email)] = u.ID
}
}
llog.Debug("loaded users from slack", llog.KV{"numUsers": len(emailToID)})
s.emailToID = emailToID
s.refreshed = time.Now()
return nil
}
func (s *slackState) refreshIfNecessary() error {
if s.sapi == nil {
return nil
}
if time.Since(s.refreshed) > time.Hour {
return s.refresh()
}
return nil
}
// MentionUser either returns just their name or it @ mentions them
// MentionUser implements the events.MessageEnricher interface
func (s *slackState) MentionUser(email string, name string) string {
llog.Debug("lloking up user", llog.KV{"email": email})
id, ok := s.emailToID[strings.ToLower(email)]
if ok {
return fmt.Sprintf("<@%s>", id)
}
return name
}
func listenForEvents(client *gerrit.Client, ech <-chan gerritssh.Event, sch chan webhookSubmit, token string) {
var state slackState
if token != "" {
state.sapi = slack.New(token)
}
if err := state.refresh(); err != nil {
llog.Fatal("failed to load slack metadata", llog.ErrKV(err))
}
for e := range ech {
go func(e gerritssh.Event) {
var pcfg project.Config
if e.Change.Project != "" {
var err error
pcfg, err = project.LoadConfig(client, e.Change.Project)
if err != nil {
llog.Error("error loading config", llog.ErrKV(err), e.KV())
return
}
}
h, ok := events.Handler(e, pcfg)
if !ok {
llog.Info("no handlers for event", e.KV())
return
}
ignore, err := h.Ignore(e, pcfg)
if err != nil {
llog.Error("error handling event", llog.ErrKV(err), e.KV(), llog.KV{"handler": h.Type()})
return
}
if ignore {
return
}
if err := state.refreshIfNecessary(); err != nil {
llog.Error("error refreshing slack metadata", llog.ErrKV(err))
}
msg, err := h.Message(e, pcfg, client, &state)
if err != nil {
llog.Error("error generating message for event", llog.ErrKV(err), e.KV(), llog.KV{"handler": h.Type()})
return
}
sch <- webhookSubmit{
Message: msg,
WebhookURL: pcfg.WebhookURL,
SourceType: e.Type,
}
}(e)
}
}
type webhookSubmit struct {
events.Message
WebhookURL string
SourceType string
}
func webhookSubmitter(sch <-chan webhookSubmit) {
var pendingMessages []webhookSubmit
publish := func(s webhookSubmit) bool {
if s.WebhookURL == "" {
return true
}
b, err := json.Marshal(s.Message)
if err != nil {
llog.Error("error marshalling message", llog.ErrKV(err))
// pretend it worked because we can't magically marshal it later
return true
}
resp, err := http.Post(s.WebhookURL, "application/json", bytes.NewBuffer(b))
if err != nil {
llog.Error("error posting to slack webhook", llog.ErrKV(err), llog.KV{"url": s.WebhookURL})
return false
}
defer resp.Body.Close()
kv := llog.KV{
"channel": s.Channel,
"url": s.WebhookURL,
"source": s.SourceType,
}
switch resp.StatusCode {
case http.StatusOK:
llog.Info("posted to slack channel", kv)
case http.StatusNotFound:
llog.Error("slack channel does not exist", kv)
case http.StatusGone:
llog.Error("slack channel is archived", kv)
default:
var sbody string
body, err := ioutil.ReadAll(resp.Body)
if err == nil {
sbody = string(body)
if len(sbody) > 250 {
sbody = sbody[:250]
}
}
llog.Error("unknown error posting to slack", kv, llog.KV{
"status": resp.StatusCode,
"body": sbody,
})
return false
}
return true
}
// retry pending messages every minute
tick := time.NewTicker(time.Minute)
defer tick.Stop()
for {
select {
case <-tick.C:
if len(pendingMessages) > 0 {
var newPend []webhookSubmit
for _, s := range pendingMessages {
if !publish(s) {
newPend = append(newPend, s)
}
}
pendingMessages = newPend
}
case s := <-sch:
if !publish(s) {
pendingMessages = append(pendingMessages, s)
}
}
}
}
// todo: this is very similar to gerritssh.Client.StreamEvents
func debugEvents(p string, sshc *gerritssh.Client) {
log := &lumberjack.Logger{
Filename: p,
MaxSize: 100, // in MB
MaxBackups: 3, // keep at most 3 files
}
innerDebug := func() error {
sess, err := sshc.Dial()
if err != nil {
llog.Error("error connecting to gerrit over ssh", llog.ErrKV(err))
return err
}
sout, err := sess.StdoutPipe()
if err != nil {
llog.Error("error getting debug ssh stdout", llog.ErrKV(err))
return err
}
sos := bufio.NewScanner(sout)
runCh := make(chan error, 1)
go func() {
runCh <- sess.Run("gerrit stream-events")
}()
readCh := make(chan error, 1)
go func() {
for sos.Scan() {
_, err := fmt.Fprintf(log, "%s: %s\n", time.Now().Format(time.RFC822), string(sos.Bytes()))
if err != nil {
llog.Error("error writing to debug buffer", llog.ErrKV(err))
}
}
readCh <- sos.Err()
}()
select {
case err = <-runCh:
close(runCh)
case err = <-readCh:
close(readCh)
}
sess.Close()
<-runCh
<-readCh
// ensure there's some error that's returned
if err == nil {
err = &ssh.ExitMissingError{}
}
return err
}
for {
if err := innerDebug(); err != nil {
llog.Error("error streaming debug events", llog.ErrKV(err))
}
time.Sleep(sshRetryDelay)
}
}