From c1315a827e2bbbf543e59b6b8840b00b01956be8 Mon Sep 17 00:00:00 2001
From: "Gustavo L de Mello (Guz)" <contact@guz.one>
Date: Mon, 27 Jan 2025 10:05:26 -0300
Subject: [PATCH] feat(blogo,plugins): multi error handler

---
 blogo/plugins/multi_error_handler.go | 111 +++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 blogo/plugins/multi_error_handler.go

diff --git a/blogo/plugins/multi_error_handler.go b/blogo/plugins/multi_error_handler.go
new file mode 100644
index 0000000..23a4648
--- /dev/null
+++ b/blogo/plugins/multi_error_handler.go
@@ -0,0 +1,111 @@
+// Copyright 2025-present Gustavo "Guz" L. de Mello
+// Copyright 2025-present The Lored.dev Contributors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package plugins
+
+import (
+	"io"
+	"log/slog"
+
+	"forge.capytal.company/loreddev/x/blogo/plugin"
+	"forge.capytal.company/loreddev/x/tinyssert"
+)
+
+const multiErrorHandlerName = "blogo-multierrorhandler-errorhandler"
+
+func NewMultiErrorHandler(opts ...MultiErrorHandlerOpts) MultiErrorHandler {
+	opt := MultiErrorHandlerOpts{}
+	if len(opts) > 0 {
+		opt = opts[0]
+	}
+
+	if opt.Assertions == nil {
+		opt.Assertions = tinyssert.NewDisabledAssertions()
+	}
+	if opt.Logger == nil {
+		opt.Logger = slog.New(slog.NewTextHandler(io.Discard, &slog.HandlerOptions{}))
+	}
+
+	return &multiErrorHandler{
+		handlers: []plugin.ErrorHandler{},
+
+		assert: opt.Assertions,
+		log:    opt.Logger,
+	}
+}
+
+type MultiErrorHandler interface {
+	plugin.ErrorHandler
+	plugin.WithPlugins
+}
+
+type MultiErrorHandlerOpts struct {
+	Assertions tinyssert.Assertions
+	Logger     *slog.Logger
+}
+
+type multiErrorHandler struct {
+	handlers []plugin.ErrorHandler
+
+	assert tinyssert.Assertions
+	log    *slog.Logger
+}
+
+func (h *multiErrorHandler) Name() string {
+	return multiErrorHandlerName
+}
+
+func (h *multiErrorHandler) Use(p plugin.Plugin) {
+	h.assert.NotNil(h.handlers, "Error handlers slice should not be nil")
+	h.assert.NotNil(h.log)
+
+	log := h.log.With(slog.String("plugin", p.Name()))
+	log.Debug("Adding plugin")
+
+	if p, ok := p.(plugin.Group); ok {
+		log.Debug("Plugin is a group, using children plugins")
+		for _, p := range p.Plugins() {
+			h.Use(p)
+		}
+	}
+
+	if p, ok := p.(plugin.ErrorHandler); ok {
+		h.handlers = append(h.handlers, p)
+	} else {
+		log.Debug("Plugin does not implement ErrorHandler, ignoring")
+	}
+}
+
+func (h *multiErrorHandler) Handle(err error) (recovr any, handled bool) {
+	h.assert.NotNil(h.handlers, "Error handlers slice should not be nil")
+	h.assert.NotNil(h.log)
+
+	log := h.log.With(slog.String("err", err.Error()))
+	log.Debug("Handling error")
+
+	for _, handler := range h.handlers {
+		log := log.With(slog.String("plugin", handler.Name()))
+		log.Debug("Handling error with plugin")
+
+		recovr, ok := handler.Handle(err)
+		if ok {
+			log.Debug("Error successfully handled with plugin")
+			return recovr, ok
+		}
+	}
+
+	log.Debug("Failed to handle error with any plugin")
+	return nil, false
+}