/
module_reader.go
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/
module_reader.go
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// Copyright 2020 Buf Technologies, Inc.
//
// 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 bufmodulecache
import (
"context"
"fmt"
"io"
"sync"
"github.com/bufbuild/buf/internal/buf/bufcore/bufmodule"
"github.com/bufbuild/buf/internal/buf/bufcore/bufmodule/bufmodulestorage"
"github.com/bufbuild/buf/internal/pkg/storage"
"go.uber.org/zap"
)
type moduleReader struct {
logger *zap.Logger
cache *moduleCacher
delegate bufmodule.ModuleReader
messageWriter io.Writer
count int
cacheHits int
lock sync.RWMutex
}
func newModuleReader(
logger *zap.Logger,
moduleStore bufmodulestorage.Store,
delegate bufmodule.ModuleReader,
options ...ModuleReaderOption,
) *moduleReader {
moduleReader := &moduleReader{
logger: logger,
cache: newModuleCacher(moduleStore),
delegate: delegate,
}
for _, option := range options {
option(moduleReader)
}
return moduleReader
}
func (m *moduleReader) GetModule(
ctx context.Context,
resolvedModuleName bufmodule.ResolvedModuleName,
) (bufmodule.Module, error) {
module, err := m.cache.GetModule(ctx, resolvedModuleName)
if err != nil {
if storage.IsNotExist(err) || bufmodule.IsNoDigestError(err) {
m.logger.Debug("cache_miss", zap.String("module_name", resolvedModuleName.String()))
if m.messageWriter != nil {
if _, err := m.messageWriter.Write([]byte("buf: downloading " + resolvedModuleName.String() + "\n")); err != nil {
return nil, err
}
}
module, err := m.getModuleUncached(ctx, resolvedModuleName)
if err != nil {
return nil, err
}
m.lock.Lock()
m.count++
m.lock.Unlock()
return module, nil
}
return nil, err
}
m.logger.Debug("cache_hit", zap.String("module_name", resolvedModuleName.String()))
m.lock.Lock()
m.count++
m.cacheHits++
m.lock.Unlock()
return module, nil
}
func (m *moduleReader) getModuleUncached(
ctx context.Context,
resolvedModuleName bufmodule.ResolvedModuleName,
) (bufmodule.Module, error) {
module, err := m.delegate.GetModule(ctx, resolvedModuleName)
if err != nil {
return nil, err
}
cacheModuleName, err := m.cache.PutModule(
ctx,
resolvedModuleName,
module,
)
if err != nil {
return nil, err
}
if !bufmodule.ModuleNameEqual(resolvedModuleName, cacheModuleName) {
return nil, fmt.Errorf("mismatched cache module name: %q %q", resolvedModuleName.String(), cacheModuleName.String())
}
return module, nil
}
func (m *moduleReader) getCount() int {
m.lock.RLock()
defer m.lock.RUnlock()
return m.count
}
func (m *moduleReader) getCacheHits() int {
m.lock.RLock()
defer m.lock.RUnlock()
return m.cacheHits
}