From 619401cf4952308bec79a2c37f174eb0818b19d9 Mon Sep 17 00:00:00 2001
From: Hugo Sandelius <hugo.sandelius@einride.tech>
Date: Wed, 20 Nov 2024 13:43:18 +0100
Subject: [PATCH] feat: add cloudslog.Errors

---
 cloudslog/errors.go      | 28 ++++++++++++++++++++++++++++
 cloudslog/errors_test.go | 20 ++++++++++++++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 cloudslog/errors.go
 create mode 100644 cloudslog/errors_test.go

diff --git a/cloudslog/errors.go b/cloudslog/errors.go
new file mode 100644
index 0000000..0d4da1f
--- /dev/null
+++ b/cloudslog/errors.go
@@ -0,0 +1,28 @@
+package cloudslog
+
+import (
+	"encoding/json"
+	"log/slog"
+)
+
+// Errors creates a slog attribute for a list of errors.
+// unlike slog.Any, this will render the error strings when using slog.JSONHandler.
+func Errors(errors []error) slog.Attr {
+	jsonErrors := make([]error, len(errors))
+	for i, err := range errors {
+		jsonErrors[i] = &jsonError{err: err}
+	}
+	return slog.Any("errors", jsonErrors)
+}
+
+type jsonError struct {
+	err error
+}
+
+func (j jsonError) MarshalJSON() ([]byte, error) {
+	return json.Marshal(j.err.Error())
+}
+
+func (j jsonError) Error() string {
+	return j.err.Error()
+}
diff --git a/cloudslog/errors_test.go b/cloudslog/errors_test.go
new file mode 100644
index 0000000..d525423
--- /dev/null
+++ b/cloudslog/errors_test.go
@@ -0,0 +1,20 @@
+package cloudslog
+
+import (
+	"errors"
+	"log/slog"
+	"strings"
+	"testing"
+
+	"gotest.tools/v3/assert"
+)
+
+func TestErrors(t *testing.T) {
+	t.Run("errors", func(t *testing.T) {
+		var b strings.Builder
+		logger := slog.New(newHandler(&b, LoggerConfig{}))
+
+		logger.Info("test", Errors([]error{errors.New("test_error")}))
+		assert.Assert(t, strings.Contains(b.String(), "test_error"))
+	})
+}