Esempio n. 1
0
// Reader builds a channel that will return streams for a supplied Variable.
// If min/maxTimestamp are not nil, streams will only be returned if SOME values inside the stream match.
// The supplied variable may be a search or a single.
// The streams returned may be out of order with respect to variable names or timestamps.
func (ds *Datastore) Reader(ctx context.Context, v *variable.Variable) <-chan *oproto.ValueStream {
	varName := v.String()
	openinstrument.Logf(ctx, "Creating Reader for %s between %d and %d\n", varName, v.MinTimestamp, v.MaxTimestamp)
	out := make(chan *oproto.ValueStream, 100)
	go func() {
		defer close(out)
		ds.blocksLock.RLock()
		defer ds.blocksLock.RUnlock()
		for _, block := range ds.blocks {
			for stream := range block.Reader(ctx, v) {
				out <- stream
			}
		}
	}()
	return out
}
Esempio n. 2
0
func (s *FakeReadableStore) Reader(ctx context.Context, v *variable.Variable) <-chan *oproto.ValueStream {
	c := make(chan *oproto.ValueStream, 100)
	go func() {
		defer close(c)
		switch v.String() {
		case "/test/offset":
			c <- &oproto.ValueStream{
				Variable: v.AsProto(),
				Value: []*oproto.Value{
					{Timestamp: uint64(0), DoubleValue: float64(20)},
					{Timestamp: uint64(61), DoubleValue: float64(40)},
					{Timestamp: uint64(122), DoubleValue: float64(60)},
					{Timestamp: uint64(185), DoubleValue: float64(80)},
					{Timestamp: uint64(241), DoubleValue: float64(100)},
					{Timestamp: uint64(299), DoubleValue: float64(122)},
					{Timestamp: uint64(330), DoubleValue: float64(132)},
					{Timestamp: uint64(359), DoubleValue: float64(140)},
					{Timestamp: uint64(421), DoubleValue: float64(160)},
					{Timestamp: uint64(488), DoubleValue: float64(180)},
					{Timestamp: uint64(540), DoubleValue: float64(200)},
					{Timestamp: uint64(975), DoubleValue: float64(275)},
				},
			}
		default:
			c <- &oproto.ValueStream{
				Variable: v.AsProto(),
				Value: []*oproto.Value{
					{Timestamp: uint64(60 * 0), DoubleValue: float64(20 * 1)},
					{Timestamp: uint64(60 * 1), DoubleValue: float64(20 * 2)},
					{Timestamp: uint64(60 * 2), DoubleValue: float64(20 * 3)},
					{Timestamp: uint64(60 * 3), DoubleValue: float64(20 * 4)},
					{Timestamp: uint64(60 * 4), DoubleValue: float64(20 * 5)},
					{Timestamp: uint64(60 * 5), DoubleValue: float64(20 * 6)},
					{Timestamp: uint64(60 * 6), DoubleValue: float64(20 * 7)},
					{Timestamp: uint64(60 * 7), DoubleValue: float64(20 * 8)},
					{Timestamp: uint64(60 * 8), DoubleValue: float64(20 * 9)},
					{Timestamp: uint64(60 * 9), DoubleValue: float64(20 * 10)},
					{Timestamp: uint64(60 * 10), DoubleValue: float64(20 * 11)},
				},
			}
		}
	}()
	return c
}