m3u8: Expose m3u8 tester for VOD (#193)

* m3u8: Create exposed m3u8 tester

* m3u8: Expose InitCensus func

m3u8/tester.go

@@ -0,0 +1,30 @@
+package m3u8
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"time"
+
+	"github.com/livepeer/go-api-client"
+	"github.com/livepeer/stream-tester/internal/metrics"
+	"github.com/livepeer/stream-tester/internal/testers"
+)
+
+func InitCensus(service, version string) {
+	hostname, _ := os.Hostname()
+	metrics.InitCensus(hostname, version, service)
+}
+
+func Check(ctx context.Context, url string, expectedDuration time.Duration) error {
+	downloader := testers.NewM3utester2(ctx, url, false, false, false, false, 5*time.Second, nil, false)
+	<-downloader.Done()
+	stats := downloader.VODStats()
+	if len(stats.SegmentsNum) != len(api.StandardProfiles)+1 {
+		return fmt.Errorf("number of renditions doesn't match (has %d should %d)", len(stats.SegmentsNum), len(api.StandardProfiles)+1)
+	}
+	if ok, ers := stats.IsOk(expectedDuration, false); !ok {
+		return fmt.Errorf("playlist not ok: %s", ers)
+	}
+	return nil
+}