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/*
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 compose
import (
"fmt"
"sync"
"github.com/docker/compose/v2/pkg/api"
)
// logPrinter watch application containers and collect their logs
type logPrinter interface {
HandleEvent(event api.ContainerEvent)
Run(cascade api.Cascade, exitCodeFrom string, stopFn func() error) (int, error)
Cancel()
Stop()
}
type printer struct {
queue chan api.ContainerEvent
consumer api.LogConsumer
stopCh chan struct{} // stopCh is a signal channel for producers to stop sending events to the queue
stop sync.Once
}
// newLogPrinter builds a LogPrinter passing containers logs to LogConsumer
func newLogPrinter(consumer api.LogConsumer) logPrinter {
printer := printer{
consumer: consumer,
queue: make(chan api.ContainerEvent),
stopCh: make(chan struct{}),
stop: sync.Once{},
}
return &printer
}
func (p *printer) Cancel() {
// note: HandleEvent is used to ensure this doesn't deadlock
p.HandleEvent(api.ContainerEvent{Type: api.UserCancel})
}
func (p *printer) Stop() {
p.stop.Do(func() {
close(p.stopCh)
for {
select {
case <-p.queue:
// purge the queue to free producers goroutines
// p.queue will be garbage collected
default:
return
}
}
})
}
func (p *printer) HandleEvent(event api.ContainerEvent) {
select {
case <-p.stopCh:
return
default:
p.queue <- event
}
}
//nolint:gocyclo
func (p *printer) Run(cascade api.Cascade, exitCodeFrom string, stopFn func() error) (int, error) {
var (
aborting bool
exitCode int
)
defer p.Stop()
// containers we are tracking. Use true when container is running, false after we receive a stop|die signal
containers := map[string]bool{}
for {
select {
case <-p.stopCh:
return exitCode, nil
case event := <-p.queue:
container, id := event.Container, event.ID
switch event.Type {
case api.UserCancel:
aborting = true
case api.ContainerEventAttach:
if attached, ok := containers[id]; ok && attached {
continue
}
containers[id] = true
p.consumer.Register(container)
case api.ContainerEventExit, api.ContainerEventStopped, api.ContainerEventRecreated:
if !aborting && containers[id] {
p.consumer.Status(container, fmt.Sprintf("exited with code %d", event.ExitCode))
if event.Type == api.ContainerEventRecreated {
p.consumer.Status(container, "has been recreated")
}
}
containers[id] = false
if !event.Restarting {
delete(containers, id)
}
if cascade == api.CascadeStop {
if !aborting {
aborting = true
err := stopFn()
if err != nil {
return 0, err
}
}
}
if event.Type == api.ContainerEventExit {
if cascade == api.CascadeFail && event.ExitCode != 0 {
exitCodeFrom = event.Service
if !aborting {
aborting = true
err := stopFn()
if err != nil {
return 0, err
}
}
}
if cascade == api.CascadeStop && exitCodeFrom == "" {
exitCodeFrom = event.Service
}
}
if exitCodeFrom == event.Service && (event.Type == api.ContainerEventExit || event.Type == api.ContainerEventStopped) {
// Container was interrupted or exited, let's capture exit code
exitCode = event.ExitCode
}
if len(containers) == 0 {
// Last container terminated, done
return exitCode, nil
}
case api.ContainerEventLog, api.HookEventLog:
if !aborting {
p.consumer.Log(container, event.Line)
}
case api.ContainerEventErr:
if !aborting {
p.consumer.Err(container, event.Line)
}
}
}
}
}
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