// create creates a log stream for the instance of the awslogs logging driver
func (l *logStream) create() error {
input := &cloudwatchlogs.CreateLogStreamInput{
LogGroupName: aws.String(l.logGroupName),
LogStreamName: aws.String(l.logStreamName),
}
_, err := l.client.CreateLogStream(input)
if err != nil {
if awsErr, ok := err.(awserr.Error); ok {
fields := logrus.Fields{
"errorCode": awsErr.Code(),
"message": awsErr.Message(),
"origError": awsErr.OrigErr(),
"logGroupName": l.logGroupName,
"logStreamName": l.logStreamName,
}
if awsErr.Code() == resourceAlreadyExistsCode {
// Allow creation to succeed
logrus.WithFields(fields).Info("Log stream already exists")
return nil
}
logrus.WithFields(fields).Error("Failed to create log stream")
}
}
return err
}
// putLogEvents wraps the PutLogEvents API
func (l *logStream) putLogEvents(events []*cloudwatchlogs.InputLogEvent, sequenceToken *string) (*string, error) {
input := &cloudwatchlogs.PutLogEventsInput{
LogEvents: events,
SequenceToken: sequenceToken,
LogGroupName: aws.String(l.logGroupName),
LogStreamName: aws.String(l.logStreamName),
}
resp, err := l.client.PutLogEvents(input)
if err != nil {
if awsErr, ok := err.(awserr.Error); ok {
logrus.WithFields(logrus.Fields{
"errorCode": awsErr.Code(),
"message": awsErr.Message(),
"origError": awsErr.OrigErr(),
"logGroupName": l.logGroupName,
"logStreamName": l.logStreamName,
}).Error("Failed to put log events")
}
return nil, err
}
return resp.NextSequenceToken, nil
}
// publishBatch calls PutLogEvents for a given set of InputLogEvents,
// accounting for sequencing requirements (each request must reference the
// sequence token returned by the previous request).
func (l *logStream) publishBatch(events []*cloudwatchlogs.InputLogEvent) {
if len(events) == 0 {
return
}
sort.Sort(byTimestamp(events))
nextSequenceToken, err := l.putLogEvents(events, l.sequenceToken)
if err != nil {
if awsErr, ok := err.(awserr.Error); ok {
if awsErr.Code() == dataAlreadyAcceptedCode {
// already submitted, just grab the correct sequence token
parts := strings.Split(awsErr.Message(), " ")
nextSequenceToken = &parts[len(parts)-1]
logrus.WithFields(logrus.Fields{
"errorCode": awsErr.Code(),
"message": awsErr.Message(),
"logGroupName": l.logGroupName,
"logStreamName": l.logStreamName,
}).Info("Data already accepted, ignoring error")
err = nil
} else if awsErr.Code() == invalidSequenceTokenCode {
// sequence code is bad, grab the correct one and retry
parts := strings.Split(awsErr.Message(), " ")
token := parts[len(parts)-1]
nextSequenceToken, err = l.putLogEvents(events, &token)
}
}
}
if err != nil {
logrus.Error(err)
} else {
l.sequenceToken = nextSequenceToken
}
}