feat: engine — template renderer, rule matcher, channel router

internal/engine/renderer.go

@@ -0,0 +1,25 @@
+package engine
+
+import (
+	"bytes"
+	"fmt"
+	"text/template"
+)
+
+type Renderer struct{}
+
+func NewRenderer() *Renderer {
+	return &Renderer{}
+}
+
+func (r *Renderer) Render(tmplContent string, data map[string]interface{}) (string, error) {
+	tmpl, err := template.New("notify").Option("missingkey=error").Parse(tmplContent)
+	if err != nil {
+		return "", fmt.Errorf("parse template: %w", err)
+	}
+	var buf bytes.Buffer
+	if err := tmpl.Execute(&buf, data); err != nil {
+		return "", fmt.Errorf("execute template: %w", err)
+	}
+	return buf.String(), nil
+}