163 lines
3.5 KiB
Go
163 lines
3.5 KiB
Go
// 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 (
|
|
"bytes"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"io/fs"
|
|
"log/slog"
|
|
|
|
"forge.capytal.company/loreddev/x/blogo/plugin"
|
|
"forge.capytal.company/loreddev/x/tinyssert"
|
|
)
|
|
|
|
const multiRendererName = "blogo-multirenderer-renderer"
|
|
|
|
func NewMultiRenderer(opts ...MultiRendererOpts) MultiRenderer {
|
|
opt := MultiRendererOpts{}
|
|
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 &multiRenderer{
|
|
plugins: []plugin.Renderer{},
|
|
|
|
assert: opt.Assertions,
|
|
log: opt.Logger,
|
|
}
|
|
}
|
|
|
|
type MultiRenderer interface {
|
|
plugin.Renderer
|
|
plugin.WithPlugins
|
|
}
|
|
|
|
type MultiRendererOpts struct {
|
|
Assertions tinyssert.Assertions
|
|
Logger *slog.Logger
|
|
}
|
|
|
|
type multiRenderer struct {
|
|
plugins []plugin.Renderer
|
|
|
|
assert tinyssert.Assertions
|
|
log *slog.Logger
|
|
}
|
|
|
|
func (r *multiRenderer) Name() string {
|
|
return multiRendererName
|
|
}
|
|
|
|
func (r *multiRenderer) Use(p plugin.Plugin) {
|
|
r.assert.NotNil(p)
|
|
r.assert.NotNil(r.plugins)
|
|
r.assert.NotNil(r.log)
|
|
|
|
log := r.log.With(slog.String("plugin", p.Name()))
|
|
|
|
if pr, ok := p.(plugin.Renderer); ok {
|
|
log.Debug("Added renderer plugin")
|
|
r.plugins = append(r.plugins, pr)
|
|
} else {
|
|
log.Error(fmt.Sprintf(
|
|
"Failed to add plugin %q, since it doesn't implement plugin.Renderer",
|
|
p.Name(),
|
|
))
|
|
}
|
|
}
|
|
|
|
func (r *multiRenderer) Render(src fs.File, w io.Writer) error {
|
|
r.assert.NotNil(r.plugins)
|
|
r.assert.NotNil(r.log)
|
|
r.assert.NotNil(src)
|
|
r.assert.NotNil(w)
|
|
|
|
log := r.log.With()
|
|
|
|
mf := newMultiRendererFile(src)
|
|
|
|
for _, pr := range r.plugins {
|
|
log := log.With(slog.String("plugin", pr.Name()))
|
|
|
|
log.Debug("Trying to render with plugin")
|
|
err := pr.Render(src, w)
|
|
|
|
if err == nil {
|
|
break
|
|
}
|
|
|
|
log.Debug("Unable to render using plugin", slog.String("error", err.Error()))
|
|
log.Debug("Resetting file for next read")
|
|
|
|
if err := mf.Reset(); err != nil {
|
|
log.Error("Failed to reset file read offset", slog.String("error", err.Error()))
|
|
return errors.Join(fmt.Errorf("failed to reset file read offset"), err)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
type multiRendererFile struct {
|
|
fs.File
|
|
buf *bytes.Buffer
|
|
reader io.Reader
|
|
}
|
|
|
|
func newMultiRendererFile(f fs.File) *multiRendererFile {
|
|
if _, ok := f.(io.Seeker); ok {
|
|
return &multiRendererFile{
|
|
File: f,
|
|
reader: f,
|
|
}
|
|
}
|
|
|
|
var buf bytes.Buffer
|
|
return &multiRendererFile{
|
|
File: f,
|
|
reader: io.TeeReader(f, &buf),
|
|
buf: &buf,
|
|
}
|
|
}
|
|
|
|
func (f *multiRendererFile) Read(p []byte) (int, error) {
|
|
return f.reader.Read(p)
|
|
}
|
|
|
|
func (f *multiRendererFile) Reset() error {
|
|
if s, ok := f.File.(io.Seeker); ok {
|
|
_, err := s.Seek(0, io.SeekStart)
|
|
return err
|
|
}
|
|
var buf bytes.Buffer
|
|
r := io.MultiReader(f.buf, f.File)
|
|
|
|
f.reader = io.TeeReader(r, &buf)
|
|
f.buf = &buf
|
|
|
|
return nil
|
|
}
|