Frontend queues HTTP requests, dispatches them to backends, and handles retries for requests which failed.
| 45 | // Frontend queues HTTP requests, dispatches them to backends, and handles retries |
| 46 | // for requests which failed. |
| 47 | type Frontend struct { |
| 48 | services.Service |
| 49 | |
| 50 | cfg Config |
| 51 | log log.Logger |
| 52 | |
| 53 | requestQueue *queue.RequestQueue |
| 54 | activeUsers *util.ActiveUsersCleanupService |
| 55 | |
| 56 | connectedQuerierWorkers *atomic.Int32 |
| 57 | |
| 58 | // Subservices manager. |
| 59 | subservices *services.Manager |
| 60 | subservicesWatcher *services.FailureWatcher |
| 61 | |
| 62 | // Metrics. |
| 63 | queueLength *prometheus.GaugeVec |
| 64 | discardedRequests *prometheus.CounterVec |
| 65 | numClients prometheus.GaugeFunc |
| 66 | queueDuration prometheus.Histogram |
| 67 | actualBatchSize prometheus.Histogram |
| 68 | batchWeight *prometheus.HistogramVec |
| 69 | } |
| 70 | |
| 71 | type request struct { |
| 72 | enqueueTime time.Time |
nothing calls this directly
no outgoing calls
no test coverage detected