fix: panics when calling BlockSlice (#128)

Author: jjeffcaii

rx/flux/flux.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/jjeffcaii/reactor-go/flux"
 	"github.com/jjeffcaii/reactor-go/scheduler"
+
 	"github.com/rsocket/rsocket-go/payload"
 	"github.com/rsocket/rsocket-go/rx"
 )
@@ -22,10 +23,10 @@ type Sink interface {
 	Error(e error)
 }
 
-// Flux represents represents a reactive sequence of 0..N items.
+// Flux represents a reactive sequence of 0..N items.
 type Flux interface {
 	rx.Publisher
-	// Take take only the first N values from this Flux, if available.
+	// Take takes only the first N values from this Flux, if available.
 	Take(n int) Flux
 	// Filter evaluate each source value against the given Predicate.
 	// If the predicate test succeeds, the value is emitted.

rx/flux/proxy.go

@@ -6,6 +6,7 @@ import (
 	"github.com/jjeffcaii/reactor-go"
 	"github.com/jjeffcaii/reactor-go/flux"
 	"github.com/jjeffcaii/reactor-go/scheduler"
+
 	"github.com/rsocket/rsocket-go/payload"
 	"github.com/rsocket/rsocket-go/rx"
 )
@@ -76,12 +77,19 @@ func (p proxy) ToChan(ctx context.Context, cap int) (<-chan payload.Payload, <-c
 				err <- reactor.ErrSubscribeCancelled
 			}
 		}).
+		Map(func(any reactor.Any) (reactor.Any, error) {
+			return payload.Clone(any.(payload.Payload)), nil
+		}).
 		SubscribeWithChan(ctx, ch, err)
 	return ch, err
 }
 
 func (p proxy) BlockFirst(ctx context.Context) (first payload.Payload, err error) {
-	v, err := p.Flux.BlockFirst(ctx)
+	v, err := p.Flux.
+		Map(func(any reactor.Any) (reactor.Any, error) {
+			return payload.Clone(any.(payload.Payload)), nil
+		}).
+		BlockFirst(ctx)
 	if err != nil {
 		return
 	}
@@ -92,14 +100,18 @@ func (p proxy) BlockFirst(ctx context.Context) (first payload.Payload, err error
 }
 
 func (p proxy) BlockLast(ctx context.Context) (last payload.Payload, err error) {
-	v, err := p.Flux.BlockLast(ctx)
+	v, err := p.Flux.
+		Map(func(any reactor.Any) (reactor.Any, error) {
+			return payload.Clone(any.(payload.Payload)), nil
+		}).
+		BlockLast(ctx)
 	if err != nil {
 		return
 	}
-	if v == nil {
-		return
+	if v != nil {
+		last = v.(payload.Payload)
 	}
-	last = v.(payload.Payload)
+
 	return
 }
 
@@ -119,7 +131,7 @@ func (p proxy) BlockSlice(ctx context.Context) (results []payload.Payload, err e
 		Subscribe(
 			ctx,
 			reactor.OnNext(func(v reactor.Any) error {
-				results = append(results, v.(payload.Payload))
+				results = append(results, payload.Clone(v.(payload.Payload)))
 				return nil
 			}),
 			reactor.OnError(func(e error) {