mirror of https://github.com/docker/compose.git
63 lines
1.5 KiB
Go
63 lines
1.5 KiB
Go
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/*
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Copyright 2020 Docker Compose CLI authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package utils
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import (
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"bytes"
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"io"
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)
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// GetWriter creates a io.Writer that will actually split by line and format by LogConsumer
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func GetWriter(consumer func(string)) io.WriteCloser {
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return &splitWriter{
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buffer: bytes.Buffer{},
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consumer: consumer,
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}
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}
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type splitWriter struct {
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buffer bytes.Buffer
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consumer func(string)
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}
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// Write implements io.Writer. joins all input, splits on the separator and yields each chunk
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func (s *splitWriter) Write(b []byte) (int, error) {
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n, err := s.buffer.Write(b)
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if err != nil {
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return n, err
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}
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for {
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b = s.buffer.Bytes()
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index := bytes.Index(b, []byte{'\n'})
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if index < 0 {
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break
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}
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line := s.buffer.Next(index + 1)
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s.consumer(string(line[:len(line)-1]))
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}
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return n, nil
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}
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func (s *splitWriter) Close() error {
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b := s.buffer.Bytes()
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if len(b) == 0 {
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return nil
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}
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s.consumer(string(b))
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return nil
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}
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