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logging.go
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logging.go
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package v2action
import (
"sort"
"sync"
"time"
"code.cloudfoundry.org/cli/actor/actionerror"
"github.com/cloudfoundry/noaa"
noaaErrors "github.com/cloudfoundry/noaa/errors"
"github.com/cloudfoundry/sonde-go/events"
log "github.com/sirupsen/logrus"
)
const StagingLog = "STG"
var flushInterval = 300 * time.Millisecond
type LogMessage struct {
message string
messageType events.LogMessage_MessageType
timestamp time.Time
sourceType string
sourceInstance string
}
func (log LogMessage) Message() string {
return log.message
}
func (log LogMessage) Type() string {
if log.messageType == events.LogMessage_OUT {
return "OUT"
}
return "ERR"
}
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 int, timestamp time.Time, sourceType string, sourceInstance string) *LogMessage {
return &LogMessage{
message: message,
messageType: events.LogMessage_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]
}
func (actor Actor) GetStreamingLogs(appGUID string, client NOAAClient) (<-chan *LogMessage, <-chan error) {
log.Info("Start Tailing Logs")
ready := actor.setOnConnectBlocker(client)
incomingLogStream, incomingErrStream := client.TailingLogs(appGUID, actor.Config.AccessToken())
outgoingLogStream, outgoingErrStream := actor.blockOnConnect(ready)
go actor.streamLogsBetween(incomingLogStream, incomingErrStream, outgoingLogStream, outgoingErrStream)
return outgoingLogStream, outgoingErrStream
}
func (actor Actor) GetRecentLogsForApplicationByNameAndSpace(appName string, spaceGUID string, client NOAAClient) ([]LogMessage, Warnings, error) {
app, allWarnings, err := actor.GetApplicationByNameAndSpace(appName, spaceGUID)
if err != nil {
return nil, allWarnings, err
}
noaaMessages, err := client.RecentLogs(app.GUID, actor.Config.AccessToken())
if err != nil {
return nil, allWarnings, err
}
noaaMessages = noaa.SortRecent(noaaMessages)
var logMessages []LogMessage
for _, message := range noaaMessages {
logMessages = append(logMessages, LogMessage{
message: string(message.GetMessage()),
messageType: message.GetMessageType(),
timestamp: time.Unix(0, message.GetTimestamp()),
sourceType: message.GetSourceType(),
sourceInstance: message.GetSourceInstance(),
})
}
return logMessages, allWarnings, nil
}
func (actor Actor) GetStreamingLogsForApplicationByNameAndSpace(appName string, spaceGUID string, client NOAAClient) (<-chan *LogMessage, <-chan error, Warnings, error) {
app, allWarnings, err := actor.GetApplicationByNameAndSpace(appName, spaceGUID)
if err != nil {
return nil, nil, allWarnings, err
}
messages, logErrs := actor.GetStreamingLogs(app.GUID, client)
return messages, logErrs, allWarnings, err
}
func (actor Actor) blockOnConnect(ready <-chan bool) (chan *LogMessage, chan error) {
outgoingLogStream := make(chan *LogMessage)
outgoingErrStream := make(chan error, 1)
ticker := time.NewTicker(actor.Config.DialTimeout())
dance:
for {
select {
case _, ok := <-ready:
if !ok {
break dance
}
case <-ticker.C:
outgoingErrStream <- actionerror.NOAATimeoutError{}
break dance
}
}
return outgoingLogStream, outgoingErrStream
}
func (Actor) flushLogs(logs LogMessages, outgoingLogStream chan<- *LogMessage) LogMessages {
sort.Stable(logs)
for _, l := range logs {
outgoingLogStream <- l
}
return LogMessages{}
}
func (Actor) setOnConnectBlocker(client NOAAClient) <-chan bool {
ready := make(chan bool)
var onlyRunOnInitialConnect sync.Once
callOnConnectOrRetry := func() {
onlyRunOnInitialConnect.Do(func() {
close(ready)
})
}
client.SetOnConnectCallback(callOnConnectOrRetry)
return ready
}
func (actor Actor) streamLogsBetween(incomingLogStream <-chan *events.LogMessage, incomingErrStream <-chan error, outgoingLogStream chan<- *LogMessage, outgoingErrStream chan<- error) {
log.Info("Processing Log Stream")
defer close(outgoingLogStream)
defer close(outgoingErrStream)
ticker := time.NewTicker(flushInterval)
defer ticker.Stop()
var logsToBeSorted LogMessages
var eventClosed, errClosed bool
dance:
for {
select {
case event, ok := <-incomingLogStream:
if !ok {
if !errClosed {
log.Debug("logging event stream closed")
}
eventClosed = true
break
}
logsToBeSorted = append(logsToBeSorted, &LogMessage{
message: string(event.GetMessage()),
messageType: event.GetMessageType(),
timestamp: time.Unix(0, event.GetTimestamp()),
sourceInstance: event.GetSourceInstance(),
sourceType: event.GetSourceType(),
})
case err, ok := <-incomingErrStream:
if !ok {
if !errClosed {
log.Debug("logging error stream closed")
}
errClosed = true
break
}
if _, ok := err.(noaaErrors.RetryError); ok {
break
}
if err != nil {
outgoingErrStream <- err
}
case <-ticker.C:
log.Debug("processing logsToBeSorted")
logsToBeSorted = actor.flushLogs(logsToBeSorted, outgoingLogStream)
if eventClosed && errClosed {
log.Debug("stopping log processing")
break dance
}
}
}
}