149 lines
3.2 KiB
Go
149 lines
3.2 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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"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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const multiSourcerPluginName = "blogo-multisourcer-sourcer"
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type MultiSourcer interface {
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SourcerPlugin
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PluginWithPlugins
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}
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type multiSourcer struct {
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sources []SourcerPlugin
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panicOnInit bool
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skipOnSourceError bool
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skipOnFSError bool
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log *slog.Logger
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}
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type MultiSourcerOpts struct {
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NotPanicOnInit bool
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NotSkipOnSourceError bool
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NotSkipOnFSError bool
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Logger *slog.Logger
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}
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func NewMultiSourcer(opts ...MultiSourcerOpts) MultiSourcer {
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opt := MultiSourcerOpts{}
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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(multiSourcerPluginName)
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return &multiSourcer{
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sources: []SourcerPlugin{},
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panicOnInit: !opt.NotPanicOnInit,
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skipOnSourceError: !opt.NotSkipOnSourceError,
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skipOnFSError: !opt.NotSkipOnFSError,
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log: opt.Logger,
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}
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}
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func (p *multiSourcer) Name() string {
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return multiSourcerPluginName
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}
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func (p *multiSourcer) Use(plugin Plugin) {
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log := p.log.With(slog.String("plugin", plugin.Name()))
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if plg, ok := plugin.(SourcerPlugin); ok {
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log.Debug("Added sourcer plugin")
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p.sources = append(p.sources, plg)
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} else {
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m := fmt.Sprintf("failed to add plugin %q, since it doesn't implement SourcerPlugin", 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 *multiSourcer) Source() (fs.FS, error) {
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log := p.log
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fileSystems := []fs.FS{}
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for _, s := range p.sources {
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log = log.With(slog.String("plugin", p.Name()))
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log.Info("Sourcing file system of plugin")
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f, err := s.Source()
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if err != nil && p.skipOnSourceError {
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log.Error(
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"Failed to source file system of plugin, skipping",
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slog.String("error", err.Error()),
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)
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} else if err != nil {
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log.Error(
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"Failed to source file system of plugin, returning error",
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slog.String("error", err.Error()),
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)
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return f, err
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}
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fileSystems = append(fileSystems, f)
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}
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f := make([]fs.FS, len(fileSystems), len(fileSystems))
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for i := range f {
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f[i] = fileSystems[i]
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}
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return &multiSourcerFS{
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fileSystems: f,
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skipOnError: p.skipOnFSError,
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}, nil
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}
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type multiSourcerFS struct {
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fileSystems []fs.FS
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skipOnError bool
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}
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func (mf *multiSourcerFS) Open(name string) (fs.File, error) {
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for _, f := range mf.fileSystems {
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file, err := f.Open(name)
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if err != nil && !errors.Is(err, fs.ErrNotExist) && !mf.skipOnError {
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return file, err
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}
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if err == nil {
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return file, err
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}
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}
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return nil, fs.ErrNotExist
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}
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