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email.go
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/
email.go
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// Copyright 2020 the Exposure Notifications Verification Server authors
//
// 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 render
import (
"bytes"
"fmt"
)
// RenderEmail renders the given email HTML template by name. It attempts to
// gracefully handle any rendering errors to avoid partial responses sent to the
// response by writing to a buffer first, then flushing the buffer to the
// response.
//
// The buffers are fetched via a sync.Pool to reduce allocations and improve
// performance.
func (r *Renderer) RenderEmail(tmpl string, data interface{}) ([]byte, error) {
if r.debug {
if err := r.loadTemplates(); err != nil {
return nil, fmt.Errorf("error loading templates: %w", err)
}
}
// Acquire a renderer
b := r.rendererPool.Get().(*bytes.Buffer)
b.Reset()
defer r.rendererPool.Put(b)
// Render into the renderer
if err := r.executeTextTemplate(b, tmpl, data); err != nil {
return nil, fmt.Errorf("error executing email template: %w", err)
}
return b.Bytes(), nil
}