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fs.go
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fs.go
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// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// 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 fetch
import (
"os"
"path/filepath"
"time"
)
type fsFetcher struct {
baseFetcher
root string
}
func (f fsFetcher) File(pathElements ...string) ([]byte, error) {
if len(pathElements) == 0 {
return nil, errFilenameNotSpecified.New()
}
start := time.Now()
p := filepath.Join(pathElements...)
rp, err := realOSPath(f.root, p)
if err != nil {
return nil, err
}
content, err := os.ReadFile(rp)
if err == nil {
f.observeLatency(time.Since(start))
return content, nil
}
if os.IsNotExist(err) {
return nil, errFileNotFound.WithAttributes("filename", p)
}
return nil, errCouldNotReadFile.WithCause(err).WithAttributes("filename", p)
}
// FromFilesystem returns an interface that fetches files from the local filesystem.
func FromFilesystem(rootElements ...string) Interface {
root := filepath.Join(rootElements...)
return fsFetcher{
baseFetcher: baseFetcher{
latency: fetchLatency.WithLabelValues("fs", root),
},
root: root,
}
}