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package main
import (
"context"
"encoding/json"
"expvar"
"fmt"
"log/slog"
"net/http"
"time"
"github.com/go-git/go-git/v5"
"tailscale.com/metrics"
"xeiaso.net/v4/internal/github"
"xeiaso.net/v4/internal/lume"
)
var (
webhookCount = metrics.LabelMap{Label: "source"}
buildErrors = metrics.LabelMap{Label: "err"}
)
func init() {
expvar.Publish("gauge_xesite_webhook_count", &webhookCount)
expvar.Publish("gauge_xesite_build_errors", &buildErrors)
}
type GitHubWebhook struct {
fs *lume.FS
}
func (gh *GitHubWebhook) ServeHTTP(w http.ResponseWriter, r *http.Request) {
webhookCount.Add("github", 1)
if r.Header.Get("X-GitHub-Event") != "push" {
slog.Info("not a push event", "event", r.Header.Get("X-GitHub-Event"))
}
var event github.PushEvent
if err := json.NewDecoder(r.Body).Decode(&event); err != nil {
slog.Error("error decoding event", "error", err)
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
slog.Info("push!", "ref", event.Ref, "author", event.Pusher.Login)
if event.Ref != "refs/heads/"+*gitBranch {
slog.Error("not the right branch", "branch", event.Ref)
fmt.Fprintln(w, "OK")
return
}
go func() {
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Minute)
defer cancel()
if err := gh.fs.Update(ctx); err != nil {
buildErrors.Add(err.Error(), 1)
if err == git.NoErrAlreadyUpToDate {
slog.Info("already up to date")
return
}
slog.Error("error updating", "error", err)
}
}()
}
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