process load balancing: broken but in progress

internal/pkg/xerrgroup/doc.go

@@ -0,0 +1,6 @@
+/*
+Package xerrgroup helps running
+many functions simultaneously and wait until
+execution has completed or an error is encountered.
+*/
+package xerrgroup

internal/pkg/xerrgroup/xerrgroup.go

@@ -0,0 +1,20 @@
+package xerrgroup
+
+import (
+	"github.com/thecodingmachine/gotenberg/internal/pkg/xerror"
+	"golang.org/x/sync/errgroup"
+)
+
+// Run runs all functions simultaneously and wait until
+// execution has completed or an error is encountered.
+func Run(fn ...func() error) error {
+	const op string = "xerrgroup.Run"
+	eg := errgroup.Group{}
+	for _, f := range fn {
+		eg.Go(f)
+	}
+	if err := eg.Wait(); err != nil {
+		return xerror.New(op, err)
+	}
+	return nil
+}