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copy.go
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copy.go
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/*
* Copyright 2016 Google Inc. All rights reserved.
*
* 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 delimited
import (
"fmt"
"io"
)
// A Source represents a sequence of records.
type Source interface {
// Next returns the next record in the sequence, or io.EOF when no further
// records are available. The slice returned by Next is only required to be
// valid until a subsequent call to Next.
Next() ([]byte, error)
}
// A Sink represents a receiver of records.
type Sink interface {
// Put delivers a record to the sink.
Put([]byte) error
}
// Copy sequentially copies each record read from src to sink until src.Next()
// returns io.EOF or another error occurs.
func Copy(sink Sink, src Source) error {
for {
record, err := src.Next()
if err == io.EOF {
return nil
} else if err != nil {
return fmt.Errorf("copy: read error: %v", err)
}
if err := sink.Put(record); err != nil {
return fmt.Errorf("copy: write error: %v", err)
}
}
}