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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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 main
import (
"errors"
"flag"
"fmt"
"io"
"log"
"os"
"github.com/apache/arrow-go/v18/arrow/arrio"
"github.com/apache/arrow-go/v18/arrow/ipc"
"github.com/apache/arrow-go/v18/arrow/memory"
)
func main() {
log.SetPrefix("arrow-stream-to-file: ")
log.SetFlags(0)
flag.Parse()
err := processStream(os.Stdout, os.Stdin)
if err != nil {
log.Fatal(err)
}
}
func processStream(w *os.File, r io.Reader) error {
mem := memory.NewGoAllocator()
rr, err := ipc.NewReader(r, ipc.WithAllocator(mem))
if err != nil {
if errors.Is(err, io.EOF) {
return nil
}
return err
}
ww, err := ipc.NewFileWriter(w, ipc.WithAllocator(mem), ipc.WithSchema(rr.Schema()))
if err != nil {
return fmt.Errorf("could not create ARROW file writer: %w", err)
}
defer ww.Close()
_, err = arrio.Copy(ww, rr)
if err != nil {
return fmt.Errorf("could not copy ARROW stream: %w", err)
}
err = ww.Close()
if err != nil {
return fmt.Errorf("could not close output ARROW file: %w", err)
}
return nil
}
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