feat: add user client

userclient/middlewares/retry/retry.go

@@ -0,0 +1,56 @@
+package retry
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/go-faster/errors"
+	"github.com/gotd/td/bin"
+	"github.com/gotd/td/telegram"
+	"github.com/gotd/td/tg"
+	"github.com/gotd/td/tgerr"
+	"github.com/krau/SaveAny-Bot/common"
+)
+
+var internalErrors = []string{
+	"Timedout", // #373
+	"No workers running",
+	"RPC_CALL_FAIL",
+	"RPC_MCGET_FAIL",
+	"WORKER_BUSY_TOO_LONG_RETRY", // #462
+	"memory limit exit",          // #504
+}
+
+type retry struct {
+	max    int
+	errors []string
+}
+
+func (r retry) Handle(next tg.Invoker) telegram.InvokeFunc {
+	return func(ctx context.Context, input bin.Encoder, output bin.Decoder) error {
+		retries := 0
+
+		for retries < r.max {
+			if err := next.Invoke(ctx, input, output); err != nil {
+				if tgerr.Is(err, r.errors...) {
+					common.Log.Debug("retry middleware", "retries", retries, "error", err)
+					retries++
+					continue
+				}
+				return errors.Wrap(err, "retry middleware skip")
+			}
+
+			return nil
+		}
+
+		return fmt.Errorf("retry limit reached after %d attempts", r.max)
+	}
+}
+
+// New returns middleware that retries request if it fails with one of provided errors.
+func New(max int, errors ...string) telegram.Middleware {
+	return retry{
+		max:    max,
+		errors: append(errors, internalErrors...), // #373
+	}
+}