func getLog(cw *cloudwatchlogs.CloudWatchLogs, name string) (string, error) {
groupPrefix := aws.String("/aws/lambda/" + name)
groups, err := cw.DescribeLogGroups(&cloudwatchlogs.DescribeLogGroupsInput{LogGroupNamePrefix: groupPrefix})
if err != nil {
return "", err
}
if len(groups.LogGroups) < 1 {
return "", errors.New(fmt.Sprintf("No log group found for %s", name))
}
group := groups.LogGroups[0]
// We don't handle the case where lambda functions may share prefixes but we get the list of groups back in non-lexicographic order. Reminder in case that ever happens.
if *group.LogGroupName != *groupPrefix {
log.Fatal("Got group matching prefix but not actual", groupPrefix, group.LogGroupName)
}
streams, err := cw.DescribeLogStreams(&cloudwatchlogs.DescribeLogStreamsInput{
LogGroupName: group.LogGroupName,
Descending: aws.Bool(true),
OrderBy: aws.String("LastEventTime"),
})
if err != nil {
return "", err
}
if len(streams.LogStreams) < 1 {
return "", errors.New(fmt.Sprintf("No log streams found for %s", name))
}
stream := streams.LogStreams[0]
get_log_input := &cloudwatchlogs.GetLogEventsInput{
LogStreamName: stream.LogStreamName,
LogGroupName: group.LogGroupName,
StartFromHead: aws.Bool(true),
// allow 3 minute local vs server time out of sync
StartTime: aws.Int64(time.Now().Add(-3*time.Minute).Unix() * 1000),
}
events, err := cw.GetLogEvents(get_log_input)
if err != nil {
return "", err
}
var output bytes.Buffer
for _, event := range events.Events {
output.WriteString(*event.Message)
}
return output.String(), nil
}
func streams(svc *cloudwatchlogs.CloudWatchLogs, g string) ([]string, error) {
var streams []string
params := &cloudwatchlogs.DescribeLogStreamsInput{
LogGroupName: aws.String(g),
}
resp, err := svc.DescribeLogStreams(params)
if err != nil {
return streams, err
}
for _, l := range resp.LogStreams {
streams = append(streams, *l.LogStreamName)
}
return streams, nil
}
func findLogStreamsSince(logService *cloudwatchlogs.CloudWatchLogs, startTime time.Time, endTime time.Time, output chan<- stream) {
var (
startTimestamp = startTime.UnixNano() / 1000000
endTimestamp = endTime.UnixNano() / 1000000
)
go func() {
defer close(output)
var nextToken *string
for {
logStreams, err := logService.DescribeLogStreams(&cloudwatchlogs.DescribeLogStreamsInput{
Descending: pointer.Bool(true),
LogGroupName: pointer.String(logGroupName),
NextToken: nextToken,
OrderBy: pointer.String("LastEventTime"),
})
if err != nil {
panic(err)
}
for _, logStream := range logStreams.LogStreams {
fmt.Fprintf(os.Stderr, "%s...%s %s\n", time.Unix(0, *logStream.FirstEventTimestamp*1000000), time.Unix(0, *logStream.LastEventTimestamp*1000000), *logStream.LogStreamName)
if endTimestamp > 0 && *logStream.FirstEventTimestamp > endTimestamp {
continue
}
if *logStream.LastEventTimestamp < startTimestamp {
return
}
output <- stream{
name: *logStream.LogStreamName,
}
}
nextToken = logStreams.NextToken
}
}()
return
}
func lookupCloudWatchLogStream(conn *cloudwatchlogs.CloudWatchLogs,
name string, logStreamName string, nextToken *string) (*cloudwatchlogs.LogStream, bool, error) {
input := &cloudwatchlogs.DescribeLogStreamsInput{
LogStreamNamePrefix: aws.String(name),
LogGroupName: aws.String(logStreamName),
NextToken: nextToken,
}
resp, err := conn.DescribeLogStreams(input)
if err != nil {
return nil, true, err
}
for _, ls := range resp.LogStreams {
if *ls.LogStreamName == name {
return ls, true, nil
}
}
if resp.NextToken != nil {
return lookupCloudWatchLogStream(conn, name, logStreamName, resp.NextToken)
}
return nil, false, nil
}
