func RunListTrendingArtists(c crowdsound.CrowdSoundClient, amount int) (metrics.Histogram, error) {
h := metrics.NewHistogram(metrics.NewUniformSample(amount))
// To make trending artists meaningful, add a bunch of artists.
postStream, err := c.PostSong(context.Background())
if err != nil {
return h, err
}
for song := range songGenerator(100, 1.0) {
song.UserId = randomString(32)
if err = postStream.Send(song); err != nil {
return h, err
}
}
if _, err = postStream.CloseAndRecv(); err != nil {
return h, err
}
for i := 0; i < amount; i++ {
start := time.Now()
listStream, err := c.ListTrendingArtists(context.Background(), &crowdsound.ListTrendingArtistsRequest{})
if err != nil {
return h, err
}
for {
_, err := listStream.Recv()
if err == io.EOF {
break
}
if err != nil {
log.Fatal(err)
}
}
h.Update(time.Since(start).Nanoseconds())
}
return h, nil
}
