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webhooks.go
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webhooks.go
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package server
import (
"bytes"
"context"
"fmt"
"io"
"net/http"
"time"
"github.com/rs/zerolog/log"
"github.com/bluebrown/kobold/internal/events"
"github.com/bluebrown/kobold/internal/gitbot"
"github.com/bluebrown/kobold/internal/krm"
"github.com/bluebrown/kobold/kobold/config"
)
func RequireHeaders(headers []config.Header, handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
for _, h := range headers {
if val := r.Header.Get(h.Key); val == "" || val != h.Value {
log.Warn().Str("key", h.Key).Str("path", r.URL.Path).Msg("request does not contain required header")
w.WriteHeader(http.StatusUnauthorized)
return
}
}
handler.ServeHTTP(w, r)
})
}
func NewPushWebhook(id string, subs []chan events.PushData, ph events.PayloadHandler) http.Handler {
logger := log.With().Str("endpoint", id).Logger()
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
logger.Info().Str("endpoint", id).Msg("push event received")
var b bytes.Buffer
if _, err := io.Copy(&b, r.Body); err != nil {
logger.Debug().Err(err).Msg("could not copy body")
w.WriteHeader(http.StatusBadRequest)
return
}
bodyBytes := b.Bytes()
if err := ph.Validate(bodyBytes); err != nil {
logger.Debug().Err(err).Msg("invalid event payload")
w.WriteHeader(http.StatusBadRequest)
return
}
// since decoding may lead to external I/O, and take some time,
// do the work concurrently, since we know the payload is valid
go func() {
events, err := ph.Decode(bodyBytes)
if err != nil {
logger.Error().Err(err).Msg("failed to decode payload")
return
}
for _, event := range events {
logger.Info().
Str("image", event.Image).
Str("tag", event.Tag).
Msg("dispatching event")
for _, c := range subs {
c <- event
}
logger.Debug().Msg("event dispatched to subscribers")
}
}()
// return 202 accepted, while the request is being processed
// to avoid client timeout from the webhook sender
w.WriteHeader(http.StatusAccepted)
})
}
type commitMessenger interface {
Msg(changes []krm.Change) (string, string, error)
}
type repoBot interface {
Do(ctx context.Context, callback gitbot.DoCallback) error
}
func NewSubscriber(id string, bot repoBot, renderer krm.Renderer, messenger commitMessenger, delay time.Duration) chan events.PushData {
eventsChan := make(chan events.PushData, 10)
logger := log.With().Str("subscriber", id).Logger()
go func() {
var (
queue = make([]events.PushData, 0, 100)
debounce = new(time.Timer)
)
for {
select {
case event := <-eventsChan:
queue = append(queue, event)
if debounce.C == nil {
logger.Debug().Dur("debounceMs", delay).Msg("queueing event")
debounce = time.NewTimer(delay)
continue
}
logger.Debug().Dur("debounceMs", delay).Msg("debouncing event")
if !debounce.Stop() {
<-debounce.C
}
debounce.Reset(delay)
case <-debounce.C:
logger.Debug().Msg("processing queued events")
if err := bot.Do(logger.WithContext(context.Background()), makeDoCallback(queue, renderer, messenger)); err != nil {
logger.Error().Err(err).Msg("error while running bot")
}
queue = queue[:0]
debounce.C = nil
}
}
}()
return eventsChan
}
func makeDoCallback(queue []events.PushData, renderer krm.Renderer, messenger commitMessenger) gitbot.DoCallback {
return func(ctx context.Context, dir string) (string, string, bool, error) {
changes, err := renderer.Render(ctx, dir, queue)
if err != nil {
return "", "", false, fmt.Errorf("render: %w", err)
}
if len(changes) < 1 {
return "", "", false, nil
}
t, m, err := messenger.Msg(changes)
return t, m, true, err
}
}