fix serialization issues

chain/types/bigint.go

@@ -71,6 +71,9 @@ func (bi *BigInt) UnmarshalJSON(b []byte) error {
 
 	i, ok := big.NewInt(0).SetString(s, 10)
 	if !ok {
+		if string(s) == "<nil>" {
+			return nil
+		}
 		return fmt.Errorf("failed to parse bigint string")
 	}
 

chain/types_test.go

@@ -0,0 +1,36 @@
+package chain
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/filecoin-project/go-lotus/chain/address"
+	"github.com/filecoin-project/go-lotus/chain/types"
+)
+
+func TestSignedMessageJsonRoundtrip(t *testing.T) {
+	to, _ := address.NewIDAddress(5234623)
+	from, _ := address.NewIDAddress(603911192)
+	smsg := &SignedMessage{
+		Message: types.Message{
+			To:       to,
+			From:     from,
+			Params:   []byte("some bytes, idk"),
+			Method:   1235126,
+			Value:    types.NewInt(123123),
+			GasPrice: types.NewInt(1234),
+			GasLimit: types.NewInt(9992969384),
+			Nonce:    123123,
+		},
+	}
+
+	out, err := json.Marshal(smsg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var osmsg SignedMessage
+	if err := json.Unmarshal(out, &osmsg); err != nil {
+		t.Fatal(err)
+	}
+}

cli/createminer.go

@@ -78,6 +78,7 @@ var createMinerCmd = &cli.Command{
 			From:     addr,
 			Method:   1, // TODO: constants pls
 			Params:   params,
+			Value:    types.NewInt(0),
 			Nonce:    nonce,
 			GasPrice: types.NewInt(1),
 			GasLimit: types.NewInt(1),

node/api.go

@@ -141,7 +141,10 @@ func (a *API) WalletSign(ctx context.Context, k address.Address, msg []byte) (*c
 }
 
 func (a *API) WalletDefaultAddress(ctx context.Context) (address.Address, error) {
-	addrs := a.Wallet.ListAddrs()
+	addrs, err := a.Wallet.ListAddrs()
+	if err != nil {
+		return address.Undef, err
+	}
 
 	// TODO: store a default address in the config or 'wallet' portion of the repo
 	return addrs[0], nil