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logging.go
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logging.go
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package v7action
import (
"context"
"errors"
"log"
"strings"
"time"
"code.cloudfoundry.org/go-loggregator/rpc/loggregator_v2"
logcache "code.cloudfoundry.org/log-cache/pkg/client"
"code.cloudfoundry.org/log-cache/pkg/rpc/logcache_v1"
"github.com/sirupsen/logrus"
"code.cloudfoundry.org/cli/actor/loggingaction"
"github.com/SermoDigital/jose/jws"
)
const StagingLog = "STG"
type LogMessage struct {
message string
messageType string
timestamp time.Time
sourceType string
sourceInstance string
}
func (log LogMessage) Message() string {
return log.message
}
func (log LogMessage) Type() string {
return log.messageType
}
func (log LogMessage) Staging() bool {
return log.sourceType == StagingLog
}
func (log LogMessage) Timestamp() time.Time {
return log.timestamp
}
func (log LogMessage) SourceType() string {
return log.sourceType
}
func (log LogMessage) SourceInstance() string {
return log.sourceInstance
}
func NewLogMessage(message string, messageType string, timestamp time.Time, sourceType string, sourceInstance string) *LogMessage {
return &LogMessage{
message: message,
messageType: messageType,
timestamp: timestamp,
sourceType: sourceType,
sourceInstance: sourceInstance,
}
}
type LogMessages []*LogMessage
func (lm LogMessages) Len() int { return len(lm) }
func (lm LogMessages) Less(i, j int) bool {
return lm[i].timestamp.Before(lm[j].timestamp)
}
func (lm LogMessages) Swap(i, j int) {
lm[i], lm[j] = lm[j], lm[i]
}
type channelWriter struct {
errChannel chan error
}
func (c channelWriter) Write(bytes []byte) (n int, err error) {
c.errChannel <- errors.New(strings.Trim(string(bytes), "\n"))
return len(bytes), nil
}
func GetStreamingLogs(appGUID string, client LogCacheClient) (<-chan LogMessage, <-chan error, context.CancelFunc) {
logrus.Info("Start Tailing Logs")
outgoingLogStream := make(chan LogMessage, 1000)
outgoingErrStream := make(chan error, 1000)
ctx, cancelFunc := context.WithCancel(context.Background())
go func() {
defer close(outgoingLogStream)
defer close(outgoingErrStream)
logcache.Walk(
ctx,
appGUID,
logcache.Visitor(func(envelopes []*loggregator_v2.Envelope) bool {
logMessages := convertEnvelopesToLogMessages(envelopes)
for _, logMessage := range logMessages {
select {
case <-ctx.Done():
return false
default:
outgoingLogStream <- *logMessage
}
}
return true
}),
client.Read,
logcache.WithWalkStartTime(time.Now().Add(-5*time.Second)),
logcache.WithWalkEnvelopeTypes(logcache_v1.EnvelopeType_LOG),
logcache.WithWalkBackoff(logcache.NewAlwaysRetryBackoff(250*time.Millisecond)),
logcache.WithWalkLogger(log.New(channelWriter{
errChannel: outgoingErrStream,
}, "", 0)),
)
}()
return outgoingLogStream, outgoingErrStream, cancelFunc
}
func convertEnvelopesToLogMessages(envelopes []*loggregator_v2.Envelope) []*LogMessage {
var logMessages []*LogMessage
for _, envelope := range envelopes {
logEnvelope, ok := envelope.GetMessage().(*loggregator_v2.Envelope_Log)
if !ok {
continue
}
log := logEnvelope.Log
logMessages = append(logMessages, NewLogMessage(
string(log.Payload),
loggregator_v2.Log_Type_name[int32(log.Type)],
time.Unix(0, envelope.GetTimestamp()),
envelope.GetTags()["source_type"],
envelope.GetInstanceId(),
))
}
return logMessages
}
func (actor Actor) GetStreamingLogsForApplicationByNameAndSpace(appName string, spaceGUID string, client LogCacheClient) (<-chan LogMessage, <-chan error, context.CancelFunc, Warnings, error) {
app, allWarnings, err := actor.GetApplicationByNameAndSpace(appName, spaceGUID)
if err != nil {
return nil, nil, nil, allWarnings, err
}
messages, logErrs, cancelFunc := GetStreamingLogs(app.GUID, client)
return messages, logErrs, cancelFunc, allWarnings, err
}
func (actor Actor) GetRecentLogsForApplicationByNameAndSpace(appName string, spaceGUID string, client LogCacheClient) ([]LogMessage, Warnings, error) {
app, allWarnings, err := actor.GetApplicationByNameAndSpace(appName, spaceGUID)
if err != nil {
return nil, allWarnings, err
}
logCacheMessages, err := loggingaction.GetRecentLogs(app.GUID, client)
if err != nil {
return nil, allWarnings, err
}
//TODO: Messages need sorting for most recent?
// logCacheMessages = client.SortRecent(logCacheMessages)
var logMessages []LogMessage
for _, message := range logCacheMessages {
logMessages = append(logMessages, LogMessage{
message: message.Message,
messageType: message.MessageType,
timestamp: message.Timestamp, // time.Unix(0, message.Timestamp),
sourceType: message.SourceType,
sourceInstance: message.SourceInstance,
})
}
return logMessages, allWarnings, nil
}
func (actor Actor) ScheduleTokenRefresh() (chan bool, error) {
accessTokenString, err := actor.RefreshAccessToken()
if err != nil {
return nil, err
}
accessTokenString = strings.TrimPrefix(accessTokenString, "bearer ")
token, err := jws.ParseJWT([]byte(accessTokenString))
if err != nil {
return nil, err
}
var expiresIn time.Duration
expiration, ok := token.Claims().Expiration()
if ok {
expiresIn = time.Until(expiration)
// When we refresh exactly every EXPIRY_DURATION nanoseconds usually the auth token
// ends up expiring on the log-cache client. Better to refresh a little more often
// to avoid log outage
expiresIn = expiresIn * 9 / 10
} else {
return nil, errors.New("Failed to get an expiry time from the current access token")
}
quitNowChannel := make(chan bool, 1)
go func() {
ticker := time.NewTicker(expiresIn)
defer ticker.Stop()
for {
select {
case <-ticker.C:
_, err := actor.RefreshAccessToken()
if err != nil {
panic(err)
}
case <-quitNowChannel:
return
}
}
}()
return quitNowChannel, nil
}