159 lines
3.6 KiB
Go
159 lines
3.6 KiB
Go
// Copyright 2025-present Gustavo "Guz" L. de Mello
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// Copyright 2025-present The Lored.dev Contributors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package blogo
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"io/fs"
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"log/slog"
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)
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var ErrRendererNotSupportedFile = errors.New("this file is not supported by renderer")
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const multiRendererPluginName = "blogo-multirenderer-renderer"
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type MultiRenderer interface {
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RendererPlugin
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Use(Plugin)
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}
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type multiRenderer struct {
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renderers []RendererPlugin
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skipOnError bool
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panicOnInit bool
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log *slog.Logger
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}
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type MultiRendererOpts struct {
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NotSkipOnError bool
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NotPanicOnInit bool
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Logger *slog.Logger
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}
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func NewMultiRenderer(opts ...MultiRendererOpts) MultiRenderer {
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opt := MultiRendererOpts{}
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if len(opts) > 0 {
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opt = opts[0]
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}
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if opt.Logger == nil {
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opt.Logger = slog.New(slog.NewTextHandler(io.Discard, &slog.HandlerOptions{}))
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}
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opt.Logger = opt.Logger.WithGroup(multiRendererPluginName)
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return &multiRenderer{
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renderers: []RendererPlugin{},
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skipOnError: !opt.NotSkipOnError,
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panicOnInit: !opt.NotPanicOnInit,
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log: opt.Logger,
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}
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}
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func (p *multiRenderer) Name() string {
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return multiRendererPluginName
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}
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func (p *multiRenderer) Use(plugin Plugin) {
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log := p.log.With(slog.String("plugin", plugin.Name()))
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if plg, ok := plugin.(RendererPlugin); ok {
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log.Debug("Added renderer plugin")
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p.renderers = append(p.renderers, plg)
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} else {
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m := fmt.Sprintf("failed to add plugin %q, since it doesn't implement RendererPlugin", plugin.Name())
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log.Error(m)
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if p.panicOnInit {
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panic(fmt.Sprintf("%s: %s", p.Name(), m))
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}
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}
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}
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func (p *multiRenderer) Render(f fs.File, w io.Writer) error {
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mf := newMultiRendererFile(f)
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for _, r := range p.renderers {
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log := p.log.With(slog.String("plugin", r.Name()))
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log.Debug("Trying to render with plugin")
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err := r.Render(f, w)
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if err == nil {
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break
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}
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if !p.skipOnError && !errors.Is(err, ErrRendererNotSupportedFile) {
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log.Error("Failed to render using plugin", slog.String("error", err.Error()))
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return errors.Join(fmt.Errorf("failed to render using plugin %q", p.Name()), err)
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}
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log.Debug("Unable to render using plugin", slog.String("error", err.Error()))
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log.Debug("Resetting file for next read")
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if err := mf.Reset(); err != nil {
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log.Error("Failed to reset file read offset", slog.String("error", err.Error()))
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return errors.Join(fmt.Errorf("failed to reset file read offset"), err)
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}
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}
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return nil
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}
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type multiRendererFile struct {
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fs.File
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buf *bytes.Buffer
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reader io.Reader
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}
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func newMultiRendererFile(f fs.File) *multiRendererFile {
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if _, ok := f.(io.Seeker); ok {
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return &multiRendererFile{
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File: f,
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reader: f,
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}
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}
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var buf bytes.Buffer
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return &multiRendererFile{
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File: f,
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reader: io.TeeReader(f, &buf),
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buf: &buf,
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}
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}
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func (f *multiRendererFile) Read(p []byte) (int, error) {
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return f.reader.Read(p)
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}
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func (f *multiRendererFile) Reset() error {
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if s, ok := f.File.(io.Seeker); ok {
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_, err := s.Seek(0, io.SeekStart)
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return err
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}
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var buf bytes.Buffer
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r := io.MultiReader(f.buf, f.File)
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f.reader = io.TeeReader(r, &buf)
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f.buf = &buf
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return nil
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}
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