Utilize metrics summary instead of dumping metrics through syscalls

src/internal/events/events.go

@@ -1,8 +1,10 @@
 package events
 
 import (
+	"bytes"
 	"context"
 	"crypto/md5"
+	"encoding/json"
 	"fmt"
 	"io"
 	"os"
@@ -173,8 +175,8 @@ const APICall m = "api_call"
 
 // configurations
 const (
-	reportInterval    = 1 * time.Minute
+	reportInterval    = 100 * time.Millisecond
-	retentionDuration = 2 * time.Minute
+	retentionDuration = 200 * time.Millisecond
 )
 
 // NewMetrics embeds a metrics bus into the provided context.  The bus can be
@@ -186,28 +188,28 @@ func NewMetrics(ctx context.Context, w io.Writer) (context.Context, func()) {
 		// logging rates; that's handled by dumpMetrics().
 		sink = metrics.NewInmemSink(reportInterval, retentionDuration)
 		cfg  = metrics.DefaultConfig("corso")
-		sig  = metrics.NewInmemSignal(sink, sentSignal, w)
+		//sig  = metrics.NewInmemSignal(sink, sentSignal, w)
 	)
 
 	cfg.EnableHostname = false
-	cfg.EnableRuntimeMetrics = false
+	cfg.EnableRuntimeMetrics = true
 
 	gm, err := metrics.NewGlobal(cfg, sink)
 	if err != nil {
 		logger.CtxErr(ctx, err).Error("metrics bus constructor")
-		sig.Stop()
+		//sig.Stop()
 
 		return ctx, func() {}
 	}
 
 	stop := make(chan struct{})
-	go dumpMetrics(ctx, stop, sig)
+	go dumpMetrics(ctx, stop, sink)
 
 	flush := func() {
 		signalDump(ctx)
 		time.Sleep(500 * time.Millisecond)
 		close(stop)
-		sig.Stop()
+		//sig.Stop()
 		gm.Shutdown()
 	}
 
@@ -220,19 +222,32 @@ func NewMetrics(ctx context.Context, w io.Writer) (context.Context, func()) {
 // it to dump metrics to the provided writer (which should be the logger).
 // Expectation is for users to call this in a goroutine.  Any signal or close() on the stop chan
 // will exit the loop.
-func dumpMetrics(ctx context.Context, stop <-chan struct{}, sig *metrics.InmemSignal) {
+func dumpMetrics(ctx context.Context, stop <-chan struct{}, sink *metrics.InmemSink) {
 	tock := time.NewTicker(reportInterval)
 
 	for {
 		select {
 		case <-tock.C:
-			signalDump(ctx)
+			//signalDump(ctx)
+			raw, _ := sink.DisplayMetrics(nil, nil)
+			result := raw.(metrics.MetricsSummary)
+			summary, _ := dumpMetricsSummary(result)
+			fmt.Fprintln(os.Stderr, string(summary))
+
 		case <-stop:
 			return
 		}
 	}
 }
 
+func dumpMetricsSummary(summary metrics.MetricsSummary) ([]byte, error) {
+	buf := bytes.NewBuffer(nil)
+	if err := json.NewEncoder(buf).Encode(summary); err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
+}
+
 // Inc increments the given category by 1.
 func Inc(cat m, keys ...string) {
 	cats := append([]string{string(cat)}, keys...)