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cppfilecache.go
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cppfilecache.go
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// Copyright 2023 Google LLC
//
// 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 depscache
import (
"sync"
ppb "github.com/bazelbuild/reclient/api/proxy"
"github.com/bazelbuild/remote-apis-sdks/go/pkg/filemetadata"
"golang.org/x/sync/singleflight"
"google.golang.org/protobuf/types/known/timestamppb"
)
type fileInfo struct {
*ppb.FileInfo
updated bool
}
type cppFileCache struct {
fmc filemetadata.Cache
files map[string]fileInfo
mu sync.RWMutex
g singleflight.Group
}
func (m *cppFileCache) load(absPath string) (*ppb.FileInfo, error) {
m.mu.RLock()
fi, ok := m.files[absPath]
m.mu.RUnlock()
if ok {
if fi.updated {
return fi.FileInfo, nil
}
}
v, err, _ := m.g.Do(absPath, func() (interface{}, error) {
md := m.fmc.Get(absPath)
fi := fileInfo{
FileInfo: &ppb.FileInfo{
AbsPath: absPath,
Digest: md.Digest.String(),
Mtime: timestamppb.New(md.MTime),
},
updated: true,
}
m.mu.Lock()
defer m.mu.Unlock()
m.files[absPath] = fi
return fi, nil
})
if err != nil {
return nil, err
}
return v.(fileInfo).FileInfo, nil
}
func (m *cppFileCache) init(fInfos []*ppb.FileInfo) {
for _, fi := range fInfos {
m.files[fi.AbsPath] = fileInfo{FileInfo: fi}
}
}