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logs.go
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logs.go
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package api
import (
"cf/configuration"
"crypto/tls"
"errors"
consumer "github.com/cloudfoundry/loggregator_consumer"
"github.com/cloudfoundry/loggregatorlib/logmessage"
"time"
)
type LogsRepository interface {
RecentLogsFor(appGuid string) ([]*logmessage.LogMessage, error)
TailLogsFor(appGuid string, bufferTime time.Duration, onConnect func(), onMessage func(*logmessage.LogMessage)) error
Close()
}
type LoggregatorLogsRepository struct {
consumer consumer.LoggregatorConsumer
config configuration.Reader
TrustedCerts []tls.Certificate
}
func NewLoggregatorLogsRepository(config configuration.Reader, consumer consumer.LoggregatorConsumer) LoggregatorLogsRepository {
return LoggregatorLogsRepository{config: config, consumer: consumer}
}
func (repo LoggregatorLogsRepository) Close() {
repo.consumer.Close()
}
func (repo LoggregatorLogsRepository) RecentLogsFor(appGuid string) ([]*logmessage.LogMessage, error) {
messages, err := repo.consumer.Recent(appGuid, repo.config.AccessToken())
consumer.SortRecent(messages)
return messages, err
}
func (repo LoggregatorLogsRepository) TailLogsFor(appGuid string, bufferTime time.Duration, onConnect func(), onMessage func(*logmessage.LogMessage)) error {
endpoint := repo.config.LoggregatorEndpoint()
if endpoint == "" {
return errors.New("Loggregator endpoint missing from config file")
}
repo.consumer.SetOnConnectCallback(onConnect)
logChan, err := repo.consumer.Tail(appGuid, repo.config.AccessToken())
if err != nil {
return err
}
bufferMessages(logChan, onMessage, bufferTime)
return nil
}
func bufferMessages(logChan <-chan *logmessage.LogMessage, onMessage func(*logmessage.LogMessage), bufferTime time.Duration) {
messageQueue := NewSortedMessageQueue(bufferTime, func() time.Time {
return time.Now()
})
for {
sendMessages(messageQueue, onMessage)
select {
case msg, ok := <-logChan:
if !ok {
return
}
messageQueue.PushMessage(msg)
default:
time.Sleep(1 * time.Millisecond)
}
}
}
func sendMessages(queue *SortedMessageQueue, onMessage func(*logmessage.LogMessage)) {
for queue.NextTimestamp() < time.Now().UnixNano() {
msg := queue.PopMessage()
onMessage(msg)
}
}