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file_content_loader.go
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/
file_content_loader.go
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/*
* The MIT License (MIT)
* Copyright (c) 2023 Cisco and/or its affiliates. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
* and associated documentation files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package util
import (
"context"
"io/fs"
"os"
"path/filepath"
"sync"
"emperror.dev/errors"
"github.com/go-logr/logr"
"gopkg.in/fsnotify.v1"
)
type FileContentLoader interface {
Run(ctx context.Context, h FileContentLoadedFunc) error
}
type fileContentLoader struct {
paths []string
logger logr.Logger
mu sync.Mutex
}
type FileContentLoadedFunc func(map[string][]byte)
func NewFileContentLoader(paths []string, logger logr.Logger) FileContentLoader {
r := &fileContentLoader{
paths: []string{},
mu: sync.Mutex{},
}
for _, path := range paths {
_, err := os.Lstat(path)
if errors.Is(err, fs.ErrNotExist) {
continue
}
r.paths = append(r.paths, path)
}
r.logger = logger.WithValues("paths", r.paths)
return r
}
func (r *fileContentLoader) Run(ctx context.Context, h FileContentLoadedFunc) error {
if err := r.load(h); err != nil {
return err
}
watcher, err := fsnotify.NewWatcher()
if err != nil {
return errors.WrapIf(err, "could not get fsnotify watcher")
}
defer watcher.Close()
for _, path := range r.paths {
if _, err := os.Lstat(path); err != nil {
return errors.WrapIf(err, "could not get file info")
}
if err := watcher.Add(path); err != nil {
return errors.WrapIf(err, "could not add path to watcher")
}
}
r.logger.Info("start watching paths for changes")
for {
select {
case <-ctx.Done():
r.logger.Info("watcher stopped")
return nil
case <-watcher.Events:
if err := r.load(h); err != nil {
r.logger.Error(err, "could not load")
}
case err := <-watcher.Errors:
if err != nil {
r.logger.Error(err, "could not watch")
}
}
}
}
func (r *fileContentLoader) load(handler FileContentLoadedFunc) error {
r.logger.Info("loading files from paths")
r.mu.Lock()
defer r.mu.Unlock()
files := make([]string, 0)
for _, path := range r.paths {
info, err := os.Lstat(path)
if err != nil {
return errors.WrapIf(err, "could not get file info")
}
if info.IsDir() {
dirInfo, err := os.ReadDir(path)
if err != nil {
return errors.WrapIf(err, "could not read directory")
}
for _, entry := range dirInfo {
if entry.IsDir() {
continue
}
files = append(files, filepath.Join(path, entry.Name()))
}
} else {
files = append(files, path)
}
}
contents := make(map[string][]byte)
for _, file := range files {
content, err := os.ReadFile(file)
if err != nil {
return errors.WrapIf(err, "could not read file")
}
contents[file] = content
}
handler(contents)
return nil
}