mirror of https://github.com/docker/compose.git
93 lines
2.2 KiB
Go
93 lines
2.2 KiB
Go
/*
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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 formatter
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import (
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"bytes"
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"fmt"
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"io"
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"strconv"
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"strings"
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)
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// NewLogConsumer creates a new LogConsumer
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func NewLogConsumer(w io.Writer) LogConsumer {
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return LogConsumer{
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colors: map[string]colorFunc{},
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width: 0,
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writer: w,
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}
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}
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// Log formats a log message as received from service/container
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func (l *LogConsumer) Log(service, container, message string) {
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cf, ok := l.colors[service]
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if !ok {
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cf = <-loop
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l.colors[service] = cf
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l.computeWidth()
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}
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prefix := fmt.Sprintf("%-"+strconv.Itoa(l.width)+"s |", service)
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for _, line := range strings.Split(message, "\n") {
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buf := bytes.NewBufferString(fmt.Sprintf("%s %s\n", cf(prefix), line))
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l.writer.Write(buf.Bytes()) // nolint:errcheck
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}
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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 (l *LogConsumer) GetWriter(service, container string) io.Writer {
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return splitBuffer{
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service: service,
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container: container,
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consumer: l,
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}
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}
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func (l *LogConsumer) computeWidth() {
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width := 0
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for n := range l.colors {
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if len(n) > width {
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width = len(n)
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}
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}
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l.width = width + 3
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}
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// LogConsumer consume logs from services and format them
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type LogConsumer struct {
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colors map[string]colorFunc
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width int
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writer io.Writer
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}
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type splitBuffer struct {
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service string
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container string
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consumer *LogConsumer
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}
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func (s splitBuffer) Write(b []byte) (n int, err error) {
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split := bytes.Split(b, []byte{'\n'})
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for _, line := range split {
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if len(line) != 0 {
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s.consumer.Log(s.service, s.container, string(line))
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}
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}
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return len(b), nil
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}
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