feat(json): add JSON marshalers, which enable JSON-RPC support for SortedSectorInfo

bindings.go

@@ -2,6 +2,7 @@ package go_sectorbuilder
 
 import (
 	"bytes"
+	"encoding/json"
 	"os"
 	"runtime"
 	"sort"
@@ -53,6 +54,20 @@ func (s *SortedSectorInfo) Values() []SectorInfo {
 	return s.f
 }
 
+// MarshalJSON JSON-encodes and serializes the SortedSectorInfo.
+func (s SortedSectorInfo) MarshalJSON() ([]byte, error) {
+	return json.Marshal(s.f)
+}
+
+// UnmarshalJSON parses the JSON-encoded byte slice and stores the result in the
+// value pointed to by s.f. Note that this method allows for construction of a
+// SortedSectorInfo which violates its invariant (that its SectorInfo are sorted
+// in some defined way). Callers should take care to never provide a byte slice
+// which would violate this invariant.
+func (s *SortedSectorInfo) UnmarshalJSON(b []byte) error {
+	return json.Unmarshal(b, &s.f)
+}
+
 type SectorInfo struct {
 	SectorID uint64
 	CommR    [CommitmentBytesLen]byte

bindings_test.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"io"
 	"io/ioutil"
+	"math/big"
 	"os"
 	"testing"
 	"time"
@@ -118,6 +119,32 @@ func TestSectorBuilderLifecycle(t *testing.T) {
 	require.Equal(t, pieceBytes, unsealedPieceBytes)
 }
 
+func TestJsonMarshalSymmetry(t *testing.T) {
+	for i := 0; i < 100; i++ {
+		xs := make([]sb.SectorInfo, 10)
+		for j := 0; j < 10; j++ {
+			var x sb.SectorInfo
+			_, err := io.ReadFull(rand.Reader, x.CommR[:])
+			require.NoError(t, err)
+
+			n, err := rand.Int(rand.Reader, big.NewInt(500))
+			require.NoError(t, err)
+			x.SectorID = n.Uint64()
+			xs[j] = x
+		}
+		toSerialize := sb.NewSortedSectorInfo(xs...)
+
+		serialized, err := toSerialize.MarshalJSON()
+		require.NoError(t, err)
+
+		var fromSerialized sb.SortedSectorInfo
+		err = fromSerialized.UnmarshalJSON(serialized)
+		require.NoError(t, err)
+
+		require.Equal(t, toSerialize, fromSerialized)
+	}
+}
+
 func pollForSectorSealingStatus(ptr unsafe.Pointer, sectorID uint64, targetState sealing_state.State, timeout time.Duration) (status sb.SectorSealingStatus, retErr error) {
 	timeoutCh := time.After(timeout)