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copy.go
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copy.go
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// Copyright 2020-2024 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 storage
import (
"context"
"io"
"sync/atomic"
"github.com/bufbuild/buf/private/pkg/thread"
"go.uber.org/multierr"
)
// Copy copies the bucket at from to the bucket at to.
//
// Copies done concurrently.
// Returns the number of files copied.
func Copy(
ctx context.Context,
from ReadBucket,
to WriteBucket,
options ...CopyOption,
) (int, error) {
copyOptions := newCopyOptions()
for _, option := range options {
option(copyOptions)
}
return copyPaths(
ctx,
from,
to,
copyOptions.externalPaths,
copyOptions.atomic,
)
}
// CopyReadObject copies the contents of the ReadObject into the WriteBucket at the path.
func CopyReadObject(
ctx context.Context,
writeBucket WriteBucket,
readObject ReadObject,
options ...CopyOption,
) (retErr error) {
copyOptions := newCopyOptions()
for _, option := range options {
option(copyOptions)
}
return copyReadObject(
ctx,
readObject,
writeBucket,
readObject.Path(),
copyOptions.externalPaths,
copyOptions.atomic,
)
}
// CopyReader copies the contents of the Reader into the WriteBucket at the path.
func CopyReader(
ctx context.Context,
writeBucket WriteBucket,
reader io.Reader,
path string,
) (retErr error) {
writeObjectCloser, err := writeBucket.Put(ctx, path)
if err != nil {
return err
}
defer func() {
retErr = multierr.Append(retErr, writeObjectCloser.Close())
}()
_, err = io.Copy(writeObjectCloser, reader)
return err
}
// CopyPath copies the fromPath from the ReadBucket to the toPath on the WriteBucket.
func CopyPath(
ctx context.Context,
from ReadBucket,
fromPath string,
to WriteBucket,
toPath string,
options ...CopyOption,
) error {
copyOptions := newCopyOptions()
for _, option := range options {
option(copyOptions)
}
return copyPath(
ctx,
from,
fromPath,
to,
toPath,
copyOptions.externalPaths,
copyOptions.atomic,
)
}
// CopyOption is an option for Copy.
type CopyOption func(*copyOptions)
// CopyWithExternalPaths returns a new CopyOption that says to copy external paths.
//
// The to WriteBucket must support setting external paths.
func CopyWithExternalPaths() CopyOption {
return func(copyOptions *copyOptions) {
copyOptions.externalPaths = true
}
}
// CopyWithAtomic returns a new CopyOption that says to set PutWithAtomic when copying each file.
//
// See the documentation on PutWithAtomic for more details.
func CopyWithAtomic() CopyOption {
return func(copyOptions *copyOptions) {
copyOptions.atomic = true
}
}
func copyPaths(
ctx context.Context,
from ReadBucket,
to WriteBucket,
copyExternalPaths bool,
atomicOpt bool,
) (int, error) {
paths, err := AllPaths(ctx, from, "")
if err != nil {
return 0, err
}
var count atomic.Int64
jobs := make([]func(context.Context) error, len(paths))
for i, path := range paths {
path := path
jobs[i] = func(ctx context.Context) error {
if err := copyPath(ctx, from, path, to, path, copyExternalPaths, atomicOpt); err != nil {
return err
}
count.Add(1)
return nil
}
}
err = thread.Parallelize(ctx, jobs)
return int(count.Load()), err
}
// copyPath copies the path from the bucket at from to the bucket at to using the given paths.
//
// Paths will be normalized within this function.
func copyPath(
ctx context.Context,
from ReadBucket,
fromPath string,
to WriteBucket,
toPath string,
copyExternalPaths bool,
atomic bool,
) (retErr error) {
readObjectCloser, err := from.Get(ctx, fromPath)
if err != nil {
return err
}
defer func() {
retErr = multierr.Append(err, readObjectCloser.Close())
}()
return copyReadObject(ctx, readObjectCloser, to, toPath, copyExternalPaths, atomic)
}
func copyReadObject(
ctx context.Context,
readObject ReadObject,
to WriteBucket,
toPath string,
copyExternalPaths bool,
atomic bool,
) (retErr error) {
var putOptions []PutOption
if atomic {
putOptions = append(putOptions, PutWithAtomic())
}
writeObjectCloser, err := to.Put(ctx, toPath, putOptions...)
if err != nil {
return err
}
defer func() {
retErr = multierr.Append(retErr, writeObjectCloser.Close())
}()
if copyExternalPaths {
if err := writeObjectCloser.SetExternalPath(readObject.ExternalPath()); err != nil {
return err
}
}
_, err = io.Copy(writeObjectCloser, readObject)
return err
}
type copyOptions struct {
externalPaths bool
atomic bool
}
func newCopyOptions() *copyOptions {
return ©Options{}
}