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writer.go
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writer.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 internal
import (
"compress/gzip"
"context"
"errors"
"fmt"
"io"
"os"
"github.com/bufbuild/buf/private/pkg/app"
"github.com/bufbuild/buf/private/pkg/ioext"
"github.com/klauspost/compress/zstd"
"go.uber.org/multierr"
"go.uber.org/zap"
)
type writer struct {
logger *zap.Logger
// never set for now (no corresponding option)
httpEnabled bool
localEnabled bool
stdioEnabled bool
}
func newWriter(
logger *zap.Logger,
options ...WriterOption,
) *writer {
writer := &writer{
logger: logger,
}
for _, option := range options {
option(writer)
}
return writer
}
func (w *writer) PutFile(
ctx context.Context,
container app.EnvStdoutContainer,
fileRef FileRef,
options ...PutFileOption,
) (io.WriteCloser, error) {
putFileOptions := newPutFileOptions()
for _, option := range options {
option(putFileOptions)
}
switch t := fileRef.(type) {
case SingleRef:
return w.putSingle(
ctx,
container,
t,
putFileOptions.noFileCompression,
)
case ArchiveRef:
return w.putArchiveFile(
ctx,
container,
t,
putFileOptions.noFileCompression,
)
default:
return nil, fmt.Errorf("unknown FileRef type: %T", fileRef)
}
}
func (w *writer) putSingle(
ctx context.Context,
container app.EnvStdoutContainer,
singleRef SingleRef,
noFileCompression bool,
) (io.WriteCloser, error) {
return w.putFileWriteCloser(ctx, container, singleRef, noFileCompression)
}
func (w *writer) putArchiveFile(
ctx context.Context,
container app.EnvStdoutContainer,
archiveRef ArchiveRef,
noFileCompression bool,
) (io.WriteCloser, error) {
return w.putFileWriteCloser(ctx, container, archiveRef, noFileCompression)
}
func (w *writer) putFileWriteCloser(
ctx context.Context,
container app.EnvStdoutContainer,
fileRef FileRef,
noFileCompression bool,
) (_ io.WriteCloser, retErr error) {
writeCloser, err := w.putFileWriteCloserPotentiallyUncompressed(ctx, container, fileRef)
if err != nil {
return nil, err
}
defer func() {
if retErr != nil {
retErr = multierr.Append(retErr, writeCloser.Close())
}
}()
if noFileCompression {
return writeCloser, nil
}
switch compressionType := fileRef.CompressionType(); compressionType {
case CompressionTypeNone:
return writeCloser, nil
case CompressionTypeGzip:
gzipWriteCloser := gzip.NewWriter(writeCloser)
return ioext.CompositeWriteCloser(
gzipWriteCloser,
ioext.ChainCloser(
gzipWriteCloser,
writeCloser,
),
), nil
case CompressionTypeZstd:
zstdWriteCloser, err := zstd.NewWriter(writeCloser)
if err != nil {
return nil, err
}
return ioext.CompositeWriteCloser(
zstdWriteCloser,
ioext.ChainCloser(
zstdWriteCloser,
writeCloser,
),
), nil
default:
return nil, fmt.Errorf("unknown CompressionType: %v", compressionType)
}
}
func (w *writer) putFileWriteCloserPotentiallyUncompressed(
ctx context.Context,
container app.EnvStdoutContainer,
fileRef FileRef,
) (io.WriteCloser, error) {
switch fileScheme := fileRef.FileScheme(); fileScheme {
case FileSchemeHTTP:
if !w.httpEnabled {
return nil, NewWriteHTTPDisabledError()
}
return nil, fmt.Errorf("http not supported for writes: %v", fileRef.Path())
case FileSchemeHTTPS:
if !w.httpEnabled {
return nil, NewWriteHTTPDisabledError()
}
return nil, fmt.Errorf("https not supported for writes: %v", fileRef.Path())
case FileSchemeLocal:
if !w.localEnabled {
return nil, NewWriteLocalDisabledError()
}
return os.Create(fileRef.Path())
case FileSchemeStdio, FileSchemeStdout:
if !w.stdioEnabled {
return nil, NewWriteStdioDisabledError()
}
return ioext.NopWriteCloser(container.Stdout()), nil
case FileSchemeStdin:
return nil, errors.New("cannot write to stdin")
case FileSchemeNull:
return ioext.DiscardWriteCloser, nil
default:
return nil, fmt.Errorf("unknown FileScheme: %v", fileScheme)
}
}
type putFileOptions struct {
noFileCompression bool
}
func newPutFileOptions() *putFileOptions {
return &putFileOptions{}
}