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logs.go
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logs.go
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package ecsta
import (
"context"
"errors"
"fmt"
"log"
"strings"
"sync"
"time"
"github.com/Songmu/flextime"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs"
logsTypes "github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs/types"
"github.com/aws/aws-sdk-go-v2/service/ecs"
"github.com/aws/aws-sdk-go-v2/service/ecs/types"
"github.com/tkuchiki/parsetime"
)
type LogsOption struct {
ID string `help:"task ID"`
StartTime string `help:"a start time of logs" short:"s"`
Duration time.Duration `help:"log timestamps duration" short:"d" default:"1m"`
Follow bool `help:"follow logs" short:"f"`
Container string `help:"container name"`
Family *string `help:"task definiton family name"`
Service *string `help:"ECS service name"`
}
func (opt *LogsOption) ResolveTimestamps() (time.Time, time.Time, error) {
var startTime, endTime time.Time
if opt.StartTime != "" {
p, err := parsetime.NewParseTime()
if err != nil {
return time.Time{}, time.Time{}, fmt.Errorf("failed to create parsetime: %w", err)
}
t, err := p.Parse(opt.StartTime)
if err != nil {
return time.Time{}, time.Time{}, fmt.Errorf("failed to parse start time: %w", err)
}
startTime = t
endTime = t.Add(opt.Duration)
} else {
now := flextime.Now()
startTime = now.Add(-opt.Duration)
endTime = now
}
if opt.Follow {
endTime = time.Time{}
}
return startTime, endTime, nil
}
func (app *Ecsta) RunLogs(ctx context.Context, opt *LogsOption) error {
if err := app.SetCluster(ctx); err != nil {
return err
}
task, err := app.findTask(ctx, &optionFindTask{id: opt.ID, family: opt.Family, service: opt.Service})
if err != nil {
return fmt.Errorf("failed to select tasks: %w", err)
}
res, err := app.ecs.DescribeTaskDefinition(ctx, &ecs.DescribeTaskDefinitionInput{
TaskDefinition: task.TaskDefinitionArn,
})
if err != nil {
return fmt.Errorf("failed to describe task definition: %w", err)
}
var wg sync.WaitGroup
startTime, endTime, err := opt.ResolveTimestamps()
if err != nil {
return err
}
follows := 0
containerNames := make([]string, 0, len(res.TaskDefinition.ContainerDefinitions))
for _, c := range res.TaskDefinition.ContainerDefinitions {
name := aws.ToString(c.Name)
containerNames = append(containerNames, name)
if opt.Container != "" && opt.Container != name {
continue
}
if c.LogConfiguration == nil {
continue
}
if c.LogConfiguration.LogDriver != types.LogDriverAwslogs {
continue
}
logOpts := c.LogConfiguration.Options
logGroup := logOpts["awslogs-group"]
logStream := fmt.Sprintf("%s/%s/%s", logOpts["awslogs-stream-prefix"], *c.Name, arnToName(*task.TaskArn))
wg.Add(1)
follows++
go func() {
defer wg.Done()
if err := app.followLogs(ctx, &followOption{
logGroup: logGroup,
logStream: logStream,
startTime: startTime,
endTime: endTime,
follow: opt.Follow,
containerName: name,
}); err != nil {
log.Println(err)
}
}()
}
wg.Wait()
if follows == 0 {
return fmt.Errorf("no logs found. available containers: %s", strings.Join(containerNames, ", "))
}
return nil
}
type followOption struct {
logGroup string
logStream string
containerName string
startTime time.Time
endTime time.Time
follow bool
}
func (o followOption) Follow() bool {
return o.follow || o.endTime.IsZero()
}
func (app *Ecsta) followLogs(ctx context.Context, opt *followOption) error {
var nextToken *string
in := &cloudwatchlogs.GetLogEventsInput{
LogGroupName: &opt.logGroup,
LogStreamName: &opt.logStream,
StartTime: aws.Int64(timeToInt64msec(opt.startTime)),
Limit: aws.Int32(1000),
}
if !opt.Follow() {
in.EndTime = aws.Int64(timeToInt64msec(opt.endTime))
}
FOLLOW:
for {
if err := sleepWithContext(ctx, time.Second); err != nil {
if errors.Is(err, context.Canceled) {
return nil
}
return err
}
if nextToken != nil {
in = &cloudwatchlogs.GetLogEventsInput{
LogGroupName: &opt.logGroup,
LogStreamName: &opt.logStream,
Limit: aws.Int32(1000),
NextToken: nextToken,
}
}
res, err := app.logs.GetLogEvents(ctx, in)
if err != nil {
var ne *logsTypes.ResourceNotFoundException
// log group or log stream not found, retry after 5 seconds
if errors.As(err, &ne) {
sleepWithContext(ctx, 5*time.Second)
} else {
log.Println(err)
}
continue
}
for _, e := range res.Events {
ts := msecToTime(aws.ToInt64(e.Timestamp))
if !opt.Follow() && ts.After(opt.endTime) {
break FOLLOW
}
fmt.Println(strings.Join([]string{
ts.Format(time.RFC3339Nano),
opt.containerName,
aws.ToString(e.Message),
}, "\t"))
}
if aws.ToString(nextToken) == aws.ToString(res.NextForwardToken) {
if !opt.Follow() {
break FOLLOW
}
continue
}
nextToken = res.NextForwardToken
}
return nil
}
var epoch = time.Unix(0, 0)
func timeToInt64msec(t time.Time) int64 {
return int64(t.Sub(epoch) / time.Millisecond)
}
func msecToTime(i int64) time.Time {
return epoch.Add(time.Duration(i) * time.Millisecond)
}
func sleepWithContext(ctx context.Context, d time.Duration) error {
select {
case <-ctx.Done():
return ctx.Err()
case <-time.After(d):
return nil
}
}