package models import ( "sync" "sync/atomic" "time" "github.com/influxdata/telegraf" "github.com/influxdata/telegraf/selfstat" ) const ( // Default size of metrics batch size. DEFAULT_METRIC_BATCH_SIZE = 1000 // Default number of metrics kept. It should be a multiple of batch size. DEFAULT_METRIC_BUFFER_LIMIT = 10000 ) // OutputConfig containing name and filter type OutputConfig struct { Name string Alias string Filter Filter FlushInterval time.Duration MetricBufferLimit int MetricBatchSize int } // RunningOutput contains the output configuration type RunningOutput struct { // Must be 64-bit aligned newMetricsCount int64 droppedMetrics int64 Output telegraf.Output Config *OutputConfig MetricBufferLimit int MetricBatchSize int MetricsFiltered selfstat.Stat WriteTime selfstat.Stat BatchReady chan time.Time buffer *Buffer log telegraf.Logger aggMutex sync.Mutex } func NewRunningOutput( name string, output telegraf.Output, config *OutputConfig, batchSize int, bufferLimit int, ) *RunningOutput { tags := map[string]string{"output": config.Name} if config.Alias != "" { tags["alias"] = config.Alias } logger := &Logger{ Name: logName("outputs", config.Name, config.Alias), Errs: selfstat.Register("write", "errors", tags), } setLogIfExist(output, logger) if config.MetricBufferLimit > 0 { bufferLimit = config.MetricBufferLimit } if bufferLimit == 0 { bufferLimit = DEFAULT_METRIC_BUFFER_LIMIT } if config.MetricBatchSize > 0 { batchSize = config.MetricBatchSize } if batchSize == 0 { batchSize = DEFAULT_METRIC_BATCH_SIZE } ro := &RunningOutput{ buffer: NewBuffer(config.Name, config.Alias, bufferLimit), BatchReady: make(chan time.Time, 1), Output: output, Config: config, MetricBufferLimit: bufferLimit, MetricBatchSize: batchSize, MetricsFiltered: selfstat.Register( "write", "metrics_filtered", tags, ), WriteTime: selfstat.RegisterTiming( "write", "write_time_ns", tags, ), log: logger, } return ro } func (r *RunningOutput) LogName() string { return logName("outputs", r.Config.Name, r.Config.Alias) } func (ro *RunningOutput) metricFiltered(metric telegraf.Metric) { ro.MetricsFiltered.Incr(1) metric.Drop() } func (r *RunningOutput) Init() error { if p, ok := r.Output.(telegraf.Initializer); ok { err := p.Init() if err != nil { return err } } return nil } // AddMetric adds a metric to the output. // // Takes ownership of metric func (ro *RunningOutput) AddMetric(metric telegraf.Metric) { if ok := ro.Config.Filter.Select(metric); !ok { ro.metricFiltered(metric) return } ro.Config.Filter.Modify(metric) if len(metric.FieldList()) == 0 { ro.metricFiltered(metric) return } if output, ok := ro.Output.(telegraf.AggregatingOutput); ok { ro.aggMutex.Lock() output.Add(metric) ro.aggMutex.Unlock() return } dropped := ro.buffer.Add(metric) atomic.AddInt64(&ro.droppedMetrics, int64(dropped)) count := atomic.AddInt64(&ro.newMetricsCount, 1) if count == int64(ro.MetricBatchSize) { atomic.StoreInt64(&ro.newMetricsCount, 0) select { case ro.BatchReady <- time.Now(): default: } } } // Write writes all metrics to the output, stopping when all have been sent on // or error. func (ro *RunningOutput) Write() error { if output, ok := ro.Output.(telegraf.AggregatingOutput); ok { ro.aggMutex.Lock() metrics := output.Push() ro.buffer.Add(metrics...) output.Reset() ro.aggMutex.Unlock() } atomic.StoreInt64(&ro.newMetricsCount, 0) // Only process the metrics in the buffer now. Metrics added while we are // writing will be sent on the next call. nBuffer := ro.buffer.Len() nBatches := nBuffer/ro.MetricBatchSize + 1 for i := 0; i < nBatches; i++ { batch := ro.buffer.Batch(ro.MetricBatchSize) if len(batch) == 0 { break } err := ro.write(batch) if err != nil { ro.buffer.Reject(batch) return err } ro.buffer.Accept(batch) } return nil } // WriteBatch writes a single batch of metrics to the output. func (ro *RunningOutput) WriteBatch() error { batch := ro.buffer.Batch(ro.MetricBatchSize) if len(batch) == 0 { return nil } err := ro.write(batch) if err != nil { ro.buffer.Reject(batch) return err } ro.buffer.Accept(batch) return nil } func (r *RunningOutput) Close() { err := r.Output.Close() if err != nil { r.log.Errorf("Error closing output: %v", err) } } func (r *RunningOutput) write(metrics []telegraf.Metric) error { dropped := atomic.LoadInt64(&r.droppedMetrics) if dropped > 0 { r.log.Warnf("Metric buffer overflow; %d metrics have been dropped", dropped) atomic.StoreInt64(&r.droppedMetrics, 0) } start := time.Now() err := r.Output.Write(metrics) elapsed := time.Since(start) r.WriteTime.Incr(elapsed.Nanoseconds()) if err == nil { r.log.Debugf("Wrote batch of %d metrics in %s", len(metrics), elapsed) } return err } func (r *RunningOutput) LogBufferStatus() { nBuffer := r.buffer.Len() r.log.Debugf("Buffer fullness: %d / %d metrics", nBuffer, r.MetricBufferLimit) }