Fix Receipt decode (#221)

* Fix old post-byzantium forks

* Add to field to Receipt

Author: ferranbt

structs.go

@@ -292,6 +292,7 @@ type Receipt struct {
 	LogsBloom         []byte
 	Logs              []*Log
 	Status            uint64
+	To                *Address
 }
 
 func (r *Receipt) Copy() *Receipt {

structs_test.go

@@ -1,6 +1,8 @@
 package ethgo
 
 import (
+	_ "embed"
+	"encoding/json"
 	"math/big"
 	"reflect"
 	"testing"
@@ -103,3 +105,16 @@ func TestLog_Copy(t *testing.T) {
 		t.Fatal("incorrect receipt")
 	}
 }
+
+//go:embed testsuite/receipts.json
+var receiptsFixtures []byte
+
+func TestReceipt_Unmarshal(t *testing.T) {
+	var cases []json.RawMessage
+	assert.NoError(t, json.Unmarshal(receiptsFixtures, &cases))
+
+	for _, c := range cases {
+		receipt := &Receipt{}
+		assert.NoError(t, receipt.UnmarshalJSON(c))
+	}
+}

structs_unmarshal.go

@@ -304,8 +304,22 @@ func (r *Receipt) UnmarshalJSON(buf []byte) error {
 	if r.LogsBloom, err = decodeBytes(r.LogsBloom[:0], v, "logsBloom", 256); err != nil {
 		return err
 	}
-	if r.Status, err = decodeUint(v, "status"); err != nil {
-		return err
+	if v.Exists("status") {
+		// post-byzantium fork
+		if r.Status, err = decodeUint(v, "status"); err != nil {
+			return err
+		}
+	}
+
+	if v.Exists("to") {
+		// Do not decode 'to' if it doesn't exist.
+		if v.Get("to").String() != "null" {
+			var to Address
+			if err = decodeAddr(&to, v, "to"); err != nil {
+				return err
+			}
+			r.To = &to
+		}
 	}
 
 	// logs

testsuite/receipts.json

@@ -0,0 +1,34 @@
+[
+    {
+        "blockHash": "0x1ee40a01cdb865600eef166d175eade70ab51f215c5663a7fcc5ec1f960f4e40",
+        "blockNumber": "0x10482a",
+        "contractAddress": "0xd63d7145f125b16bb36fe73f2128bb77dcc8ccf1",
+        "cumulativeGasUsed": "0x3765f",
+        "effectiveGasPrice": "0xba43b7400",
+        "from": "0x20e021a751cb6bcab2eaf7b9db570ec10c8ad0a2",
+        "gasUsed": "0x32457",
+        "logs": [],
+        "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+        "root": "0xe41f2551706d287917eb795bb81348d68ca6f9300e1394e4c8d3288ae16865dc",
+        "to": null,
+        "transactionHash": "0xcbb8db2cec3fa38e2ff221462708252bbbe32abb57e5a43f402155880d2883e0",
+        "transactionIndex": "0x1",
+        "type": "0x0"
+    },
+    {
+        "blockHash": "0x7ba787b8371397a05412121bf915373ebbcdfa6e4117f6076911a34ee9bca4a8",
+        "blockNumber": "0xee76d0",
+        "contractAddress": null,
+        "cumulativeGasUsed": "0x114db42",
+        "effectiveGasPrice": "0x222359b14",
+        "from": "0xdafea492d9c6733ae3d56b7ed1adb60692c98bc5",
+        "gasUsed": "0x523f",
+        "logs": [],
+        "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+        "status": "0x1",
+        "to": "0xebec795c9c8bbd61ffc14a6662944748f299cacf",
+        "transactionHash": "0xdd002538bd3165c8aed8a7435f965420bca4406951e490190f4271302a4c5254",
+        "transactionIndex": "0x90",
+        "type": "0x0"
+    }
+]