// handleLogs send the log message of an app.
func handleLogs(request *api.Request) (interface{}, error) {
// Map the data to the custom type.
var data api.RequestLogs
err := request.MapTo(&data)
if err != nil {
return nil, err
}
// Validate.
if len(data.Name) == 0 {
return nil, fmt.Errorf("missing or invalid data: %+v", data)
}
// Obtain the app with the given name.
a, err := apps.Get(data.Name)
if err != nil {
return nil, fmt.Errorf("failed to get log message: %v", err)
}
// Create the response value.
res := api.ResponseLogs{}
// If no specific container is passed,
// then send a list of all available containers.
if len(data.Container) == 0 {
res.Containers, err = a.Containers()
if err != nil {
return nil, fmt.Errorf("failed to get app containers: %v", err)
}
} else {
var streamType docker.StdStream = docker.StdStreamCombined
// Get the stream option.
if len(data.Stream) > 0 {
if data.Stream == "stderr" {
streamType = docker.StdStreamError
} else if data.Stream == "stdout" {
streamType = docker.StdStreamOutput
} else {
return nil, fmt.Errorf("failed to get log messages: invalid stream option.")
}
}
// Get the log messages.
logs, err := docker.Logs(a.ContainerNamePrefix()+data.Container, streamType)
if err != nil {
return nil, fmt.Errorf("failed to get log messages: %v", err)
}
// Set the response log messages.
res.LogMessages = logs
}
return res, nil
}
func _checkRestart(app *App, retryCount int) (err error) {
// Increment the retry count.
retryCount++
var stoppedContainers []*d.Container
// Get all containers which stopped running.
for _, id := range app.containerIDs {
// Obtain the container with its ID.
c, err := docker.Client.InspectContainer(id)
if err != nil {
return err
}
// Check if not running.
if !c.State.Running {
// Append the stopped container to the slice.
stoppedContainers = append(stoppedContainers, c)
// Log
log.WithFields(
log.Fields{
"app": app.name,
"container ID": c.ID,
"container name": c.Name,
}).Warning("app container stopped running!")
}
}
// Return if everything is ok.
if len(stoppedContainers) == 0 {
return nil
}
// Abort and return an error if the retry count is reached.
if retryCount > maximumRestartRetryCount {
var errStr string
// Obtain the error logs from the stopped containers.
for _, c := range stoppedContainers {
stderr, err := docker.Logs(c.ID, docker.StdStreamError)
if err != nil {
log.Errorln(err)
continue
}
// Add a spacing to each error line.
lines := strings.Split(stderr, "\n")
for i := 0; i < len(lines); i++ {
lines[i] = " " + lines[i]
}
stderr = " " + strings.TrimSpace(strings.Join(lines, "\n"))
errStr += fmt.Sprintf("\n\nContainer '%s' error output:\n%s", c.Name, stderr)
}
return fmt.Errorf("failed to restart app: max restart retries reached! App '%s' stopped running!%s", app.name, errStr)
}
// Set the app state.
app.setState("restarting app...")
// Log.
log.Infof("restarting app '%s'", app.name)
// First stop and remove all app containers.
if err = stopContainers(app); err != nil {
return err
}
// Start the app containers again.
if err = startContainers(app); err != nil {
return err
}
// Recall this method to recheck the state.
return _checkRestart(app, retryCount)
}
