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noaa_logs_repository.go
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/
noaa_logs_repository.go
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package logs
import (
"errors"
"fmt"
"time"
. "code.cloudfoundry.org/cli/cf/i18n"
"code.cloudfoundry.org/cli/cf/api/authentication"
"code.cloudfoundry.org/cli/cf/configuration/coreconfig"
"github.com/cloudfoundry/noaa"
noaaerrors "github.com/cloudfoundry/noaa/errors"
"github.com/cloudfoundry/sonde-go/events"
)
type NoaaLogsRepository struct {
config coreconfig.Reader
consumer NoaaConsumer
tokenRefresher authentication.TokenRefresher
messageQueue *NoaaMessageQueue
BufferTime time.Duration
retryTimeout time.Duration
}
func NewNoaaLogsRepository(config coreconfig.Reader, consumer NoaaConsumer, tr authentication.TokenRefresher, retryTimeout time.Duration) *NoaaLogsRepository {
consumer.RefreshTokenFrom(tr)
return &NoaaLogsRepository{
config: config,
consumer: consumer,
tokenRefresher: tr,
messageQueue: NewNoaaMessageQueue(),
BufferTime: defaultBufferTime,
retryTimeout: retryTimeout,
}
}
func (repo *NoaaLogsRepository) Close() {
_ = repo.consumer.Close()
}
func loggableMessagesFromNoaaMessages(messages []*events.LogMessage) []Loggable {
loggableMessages := make([]Loggable, len(messages))
for i, m := range messages {
loggableMessages[i] = NewNoaaLogMessage(m)
}
return loggableMessages
}
func (repo *NoaaLogsRepository) RecentLogsFor(appGUID string) ([]Loggable, error) {
logs, err := repo.consumer.RecentLogs(appGUID, repo.config.AccessToken())
if err != nil {
return loggableMessagesFromNoaaMessages(logs), err
}
return loggableMessagesFromNoaaMessages(noaa.SortRecent(logs)), err
}
func (repo *NoaaLogsRepository) TailLogsFor(appGUID string, onConnect func(), logChan chan<- Loggable, errChan chan<- error) {
ticker := time.NewTicker(repo.BufferTime)
retryTimer := newUnstartedTimer()
endpoint := repo.config.DopplerEndpoint()
if endpoint == "" {
errChan <- errors.New(T("No doppler loggregator endpoint found. Cannot retrieve logs."))
return
}
repo.consumer.SetOnConnectCallback(func() {
retryTimer.Stop()
onConnect()
})
c, e := repo.consumer.TailingLogs(appGUID, repo.config.AccessToken())
go func() {
defer close(logChan)
defer close(errChan)
timerRunning := false
for {
select {
case msg, ok := <-c:
if !ok {
ticker.Stop()
repo.flushMessages(logChan)
return
}
timerRunning = false
repo.messageQueue.PushMessage(msg)
case err := <-e:
if err != nil {
if _, ok := err.(noaaerrors.RetryError); ok {
if !timerRunning {
timerRunning = true
retryTimer.Reset(repo.retryTimeout)
}
continue
}
errChan <- err
ticker.Stop()
return
}
case <-retryTimer.C:
errChan <- fmt.Errorf("Timed out waiting for connection to Loggregator (%s).", repo.config.DopplerEndpoint())
ticker.Stop()
return
}
}
}()
go func() {
for range ticker.C {
repo.flushMessages(logChan)
}
}()
}
func (repo *NoaaLogsRepository) flushMessages(c chan<- Loggable) {
repo.messageQueue.EnumerateAndClear(func(m *events.LogMessage) {
c <- NewNoaaLogMessage(m)
})
}
// newUnstartedTimer returns a *time.Timer that is in an unstarted
// state.
func newUnstartedTimer() *time.Timer {
timer := time.NewTimer(time.Second)
timer.Stop()
return timer
}