/* Copyright 2020 Docker Compose CLI authors 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 utils import ( "bytes" "io" "github.com/docker/compose-cli/api/compose" ) // FilteredLogConsumer filters logs for given services func FilteredLogConsumer(consumer compose.LogConsumer, services []string) compose.LogConsumer { if len(services) == 0 { return consumer } allowed := map[string]bool{} for _, s := range services { allowed[s] = true } return &allowListLogConsumer{ allowList: allowed, delegate: consumer, } } type allowListLogConsumer struct { allowList map[string]bool delegate compose.LogConsumer } func (a *allowListLogConsumer) Log(container, service, message string) { if a.allowList[service] { a.delegate.Log(container, service, message) } } func (a *allowListLogConsumer) Status(container, message string) { if a.allowList[container] { a.delegate.Status(container, message) } } func (a *allowListLogConsumer) Register(name string) { if a.allowList[name] { a.delegate.Register(name) } } // GetWriter creates a io.Writer that will actually split by line and format by LogConsumer func GetWriter(container, service string, events compose.ContainerEventListener) io.WriteCloser { return &splitBuffer{ buffer: bytes.Buffer{}, service: service, container: container, consumer: events, } } type splitBuffer struct { buffer bytes.Buffer service string container string consumer compose.ContainerEventListener } // Write implements io.Writer. joins all input, splits on the separator and yields each chunk func (s *splitBuffer) Write(b []byte) (int, error) { n, err := s.buffer.Write(b) if err != nil { return n, err } for { b = s.buffer.Bytes() index := bytes.Index(b, []byte{'\n'}) if index < 0 { break } line := s.buffer.Next(index + 1) s.consumer(compose.ContainerEvent{ Type: compose.ContainerEventLog, Service: s.service, Container: s.container, Line: string(line[:len(line)-1]), }) } return n, nil } func (s *splitBuffer) Close() error { b := s.buffer.Bytes() if len(b) == 0 { return nil } s.consumer(compose.ContainerEvent{ Type: compose.ContainerEventLog, Service: s.service, Container: s.container, Line: string(b), }) return nil }