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bucket.go
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bucket.go
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// Copyright 2020-2022 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 storagemem
import (
"context"
"fmt"
"sort"
"sync"
"github.com/bufbuild/buf/private/pkg/normalpath"
"github.com/bufbuild/buf/private/pkg/storage"
"github.com/bufbuild/buf/private/pkg/storage/storagemem/internal"
"github.com/bufbuild/buf/private/pkg/storage/storageutil"
)
type bucket struct {
pathToImmutableObject map[string]*internal.ImmutableObject
lock sync.RWMutex
}
func newBucket(pathToImmutableObject map[string]*internal.ImmutableObject) *bucket {
if pathToImmutableObject == nil {
pathToImmutableObject = make(map[string]*internal.ImmutableObject)
}
return &bucket{
pathToImmutableObject: pathToImmutableObject,
}
}
func (b *bucket) Get(ctx context.Context, path string) (storage.ReadObjectCloser, error) {
immutableObject, err := b.readLockAndGetImmutableObject(ctx, path)
if err != nil {
return nil, err
}
return newReadObjectCloser(immutableObject), nil
}
func (b *bucket) Stat(ctx context.Context, path string) (storage.ObjectInfo, error) {
return b.readLockAndGetImmutableObject(ctx, path)
}
func (b *bucket) Walk(ctx context.Context, prefix string, f func(storage.ObjectInfo) error) error {
prefix, err := storageutil.ValidatePrefix(prefix)
if err != nil {
return err
}
walkChecker := storageutil.NewWalkChecker()
b.lock.RLock()
defer b.lock.RUnlock()
// To ensure same iteration order.
// We could create this in-place during puts with an insertion sort if this
// gets to be time prohibitive.
paths := make([]string, 0, len(b.pathToImmutableObject))
for path := range b.pathToImmutableObject {
paths = append(paths, path)
}
sort.Strings(paths)
for _, path := range paths {
immutableObject, ok := b.pathToImmutableObject[path]
if !ok {
// this is a system error
return fmt.Errorf("path %q not in pathToObject", path)
}
if err := walkChecker.Check(ctx); err != nil {
return err
}
if !normalpath.EqualsOrContainsPath(prefix, path, normalpath.Relative) {
continue
}
if err := f(immutableObject); err != nil {
return err
}
}
return nil
}
func (b *bucket) Put(ctx context.Context, path string) (storage.WriteObjectCloser, error) {
// No need to lock as we do no modifications until close
path, err := storageutil.ValidatePath(path)
if err != nil {
return nil, err
}
return newWriteObjectCloser(b, path), nil
}
func (b *bucket) Delete(ctx context.Context, path string) error {
path, err := storageutil.ValidatePath(path)
if err != nil {
return err
}
b.lock.Lock()
defer b.lock.Unlock()
if _, ok := b.pathToImmutableObject[path]; !ok {
return storage.NewErrNotExist(path)
}
// Note that if there is an existing reader for an object of the same path,
// that reader will continue to read the original file, but we accept this
// as no less consistent than os mechanics.
delete(b.pathToImmutableObject, path)
return nil
}
func (b *bucket) DeleteAll(ctx context.Context, prefix string) error {
prefix, err := storageutil.ValidatePrefix(prefix)
if err != nil {
return err
}
b.lock.Lock()
defer b.lock.Unlock()
for path := range b.pathToImmutableObject {
if normalpath.EqualsOrContainsPath(prefix, path, normalpath.Relative) {
// Note that if there is an existing reader for an object of the same path,
// that reader will continue to read the original file, but we accept this
// as no less consistent than os mechanics.
delete(b.pathToImmutableObject, path)
}
}
return nil
}
func (*bucket) SetExternalPathSupported() bool {
return true
}
func (b *bucket) ToReadBucket() (storage.ReadBucket, error) {
return b, nil
}
func (b *bucket) readLockAndGetImmutableObject(ctx context.Context, path string) (*internal.ImmutableObject, error) {
path, err := storageutil.ValidatePath(path)
if err != nil {
return nil, err
}
b.lock.RLock()
defer b.lock.RUnlock()
immutableObject, ok := b.pathToImmutableObject[path]
if !ok {
// it would be nice if this was external path for every bucket
// the issue is here: we don't know the external path for memory buckets
// because we store external paths individually, so if we do not have
// an object, we do not have an external path
return nil, storage.NewErrNotExist(path)
}
return immutableObject, nil
}