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// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package iotools
import (
"io"
"os"
"codeberg.org/gruf/go-fastcopy"
)
// ReadFnCloser takes an io.Reader and wraps it to use the provided function to implement io.Closer.
func ReadFnCloser(r io.Reader, close func() error) io.ReadCloser {
return &readFnCloser{
Reader: r,
close: close,
}
}
type readFnCloser struct {
io.Reader
close func() error
}
func (r *readFnCloser) Close() error {
return r.close()
}
// WriteFnCloser takes an io.Writer and wraps it to use the provided function to implement io.Closer.
func WriteFnCloser(w io.Writer, close func() error) io.WriteCloser {
return &writeFnCloser{
Writer: w,
close: close,
}
}
type writeFnCloser struct {
io.Writer
close func() error
}
func (r *writeFnCloser) Close() error {
return r.close()
}
// SilentReader wraps an io.Reader to silence any
// error output during reads. Instead they are stored
// and accessible (not concurrency safe!) via .Error().
type SilentReader struct {
io.Reader
err error
}
// SilenceReader wraps an io.Reader within SilentReader{}.
func SilenceReader(r io.Reader) *SilentReader {
return &SilentReader{Reader: r}
}
func (r *SilentReader) Read(b []byte) (int, error) {
n, err := r.Reader.Read(b)
if err != nil {
// Store error for now
if r.err == nil {
r.err = err
}
// Pretend we're happy
// to continue reading.
n = len(b)
}
return n, nil
}
func (r *SilentReader) Error() error {
return r.err
}
// SilentWriter wraps an io.Writer to silence any
// error output during writes. Instead they are stored
// and accessible (not concurrency safe!) via .Error().
type SilentWriter struct {
io.Writer
err error
}
// SilenceWriter wraps an io.Writer within SilentWriter{}.
func SilenceWriter(w io.Writer) *SilentWriter {
return &SilentWriter{Writer: w}
}
func (w *SilentWriter) Write(b []byte) (int, error) {
n, err := w.Writer.Write(b)
if err != nil {
// Store error for now
if w.err == nil {
w.err = err
}
// Pretend we're happy
// to continue writing.
n = len(b)
}
return n, nil
}
func (w *SilentWriter) Error() error {
return w.err
}
func StreamReadFunc(read func(io.Reader) error) io.Writer {
// In-memory stream.
pr, pw := io.Pipe()
go func() {
var err error
defer func() {
// Always pass along error.
pr.CloseWithError(err)
}()
// Start reading.
err = read(pr)
}()
return pw
}
func StreamWriteFunc(write func(io.Writer) error) io.Reader {
// In-memory stream.
pr, pw := io.Pipe()
go func() {
var err error
defer func() {
// Always pass along error.
pw.CloseWithError(err)
}()
// Start writing.
err = write(pw)
}()
return pr
}
type tempFileSeeker struct {
io.Reader
io.Seeker
tmp *os.File
}
func (tfs *tempFileSeeker) Close() error {
tfs.tmp.Close()
return os.Remove(tfs.tmp.Name())
}
// TempFileSeeker converts the provided Reader into a ReadSeekCloser
// by using an underlying temporary file. Callers should call the Close
// function when they're done with the TempFileSeeker, to release +
// clean up the temporary file.
func TempFileSeeker(r io.Reader) (io.ReadSeekCloser, error) {
tmp, err := os.CreateTemp(os.TempDir(), "gotosocial-")
if err != nil {
return nil, err
}
if _, err := fastcopy.Copy(tmp, r); err != nil {
return nil, err
}
return &tempFileSeeker{
Reader: tmp,
Seeker: tmp,
tmp: tmp,
}, nil
}
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