// 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
}
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
}