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|
//+build linux
//+build systemd
package libpod
import (
"context"
"fmt"
"io"
"math"
"strings"
"time"
"github.com/containers/podman/v3/libpod/define"
"github.com/containers/podman/v3/libpod/logs"
journal "github.com/coreos/go-systemd/v22/sdjournal"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
const (
// journaldLogOut is the journald priority signifying stdout
journaldLogOut = "6"
// journaldLogErr is the journald priority signifying stderr
journaldLogErr = "3"
// bufLen is the length of the buffer to read from a k8s-file
// formatted log line
// let's set it as 2k just to be safe if k8s-file format ever changes
bufLen = 16384
)
func (c *Container) readFromJournal(ctx context.Context, options *logs.LogOptions, logChannel chan *logs.LogLine) error {
var config journal.JournalReaderConfig
if options.Tail < 0 {
config.NumFromTail = 0
} else if options.Tail == 0 {
config.NumFromTail = math.MaxUint64
} else {
config.NumFromTail = uint64(options.Tail)
}
if options.Multi {
config.Formatter = journalFormatterWithID
} else {
config.Formatter = journalFormatter
}
defaultTime := time.Time{}
if options.Since != defaultTime {
// coreos/go-systemd/sdjournal doesn't correctly handle requests for data in the future
// return nothing instead of falsely printing
if time.Now().Before(options.Since) {
return nil
}
// coreos/go-systemd/sdjournal expects a negative time.Duration for times in the past
config.Since = -time.Since(options.Since)
}
config.Matches = append(config.Matches, journal.Match{
Field: "CONTAINER_ID_FULL",
Value: c.ID(),
})
options.WaitGroup.Add(1)
r, err := journal.NewJournalReader(config)
if err != nil {
return err
}
if r == nil {
return errors.Errorf("journal reader creation failed")
}
if options.Tail == math.MaxInt64 {
r.Rewind()
}
state, err := c.State()
if err != nil {
return err
}
if options.Follow && state == define.ContainerStateRunning {
go func() {
done := make(chan bool)
until := make(chan time.Time)
go func() {
select {
case <-ctx.Done():
until <- time.Time{}
case <-done:
// nothing to do anymore
}
}()
go func() {
// FIXME (#10323): we are facing a terrible
// race condition here. At the time the
// container dies and `c.Wait()` has returned,
// we may not have received all journald logs.
// So far there is no other way than waiting
// for a second. Ultimately, `r.Follow` is
// racy and we may have to implement our custom
// logic here.
c.Wait(ctx)
time.Sleep(time.Second)
until <- time.Time{}
}()
follower := journaldFollowBuffer{logChannel, options.Multi}
err := r.Follow(until, follower)
if err != nil {
logrus.Debugf(err.Error())
}
r.Close()
options.WaitGroup.Done()
done <- true
return
}()
return nil
}
go func() {
bytes := make([]byte, bufLen)
// /me complains about no do-while in go
ec, err := r.Read(bytes)
for ec != 0 && err == nil {
// because we are reusing bytes, we need to make
// sure the old data doesn't get into the new line
bytestr := string(bytes[:ec])
logLine, err2 := logs.NewJournaldLogLine(bytestr, options.Multi)
if err2 != nil {
logrus.Error(err2)
continue
}
logChannel <- logLine
ec, err = r.Read(bytes)
}
if err != nil && err != io.EOF {
logrus.Error(err)
}
r.Close()
options.WaitGroup.Done()
}()
return nil
}
func journalFormatterWithID(entry *journal.JournalEntry) (string, error) {
output, err := formatterPrefix(entry)
if err != nil {
return "", err
}
id, ok := entry.Fields["CONTAINER_ID_FULL"]
if !ok {
return "", fmt.Errorf("no CONTAINER_ID_FULL field present in journal entry")
}
if len(id) > 12 {
id = id[:12]
}
output += fmt.Sprintf("%s ", id)
// Append message
msg, err := formatterMessage(entry)
if err != nil {
return "", err
}
output += msg
return output, nil
}
func journalFormatter(entry *journal.JournalEntry) (string, error) {
output, err := formatterPrefix(entry)
if err != nil {
return "", err
}
// Append message
msg, err := formatterMessage(entry)
if err != nil {
return "", err
}
output += msg
return output, nil
}
func formatterPrefix(entry *journal.JournalEntry) (string, error) {
usec := entry.RealtimeTimestamp
tsString := time.Unix(0, int64(usec)*int64(time.Microsecond)).Format(logs.LogTimeFormat)
output := fmt.Sprintf("%s ", tsString)
priority, ok := entry.Fields["PRIORITY"]
if !ok {
return "", errors.Errorf("no PRIORITY field present in journal entry")
}
if priority == journaldLogOut {
output += "stdout "
} else if priority == journaldLogErr {
output += "stderr "
} else {
return "", errors.Errorf("unexpected PRIORITY field in journal entry")
}
// if CONTAINER_PARTIAL_MESSAGE is defined, the log type is "P"
if _, ok := entry.Fields["CONTAINER_PARTIAL_MESSAGE"]; ok {
output += fmt.Sprintf("%s ", logs.PartialLogType)
} else {
output += fmt.Sprintf("%s ", logs.FullLogType)
}
return output, nil
}
func formatterMessage(entry *journal.JournalEntry) (string, error) {
// Finally, append the message
msg, ok := entry.Fields["MESSAGE"]
if !ok {
return "", fmt.Errorf("no MESSAGE field present in journal entry")
}
msg = strings.TrimSuffix(msg, "\n")
return msg, nil
}
type journaldFollowBuffer struct {
logChannel chan *logs.LogLine
withID bool
}
func (f journaldFollowBuffer) Write(p []byte) (int, error) {
bytestr := string(p)
logLine, err := logs.NewJournaldLogLine(bytestr, f.withID)
if err != nil {
return -1, err
}
f.logChannel <- logLine
return len(p), nil
}
|
