account/abi: handle solidity panic revert

accounts/abi/abi.go

@@ -22,6 +22,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"math/big"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
@@ -233,23 +234,67 @@ func (abi *ABI) HasReceive() bool {
 // revertSelector is a special function selector for revert reason unpacking.
 var revertSelector = crypto.Keccak256([]byte("Error(string)"))[:4]
 
+// panicSelector is a special function selector for panic reason unpacking.
+var panicSelector = crypto.Keccak256([]byte("Panic(uint256)"))[:4]
+
+// panicReasons map is for readable panic codes
+// see this linkage for the deails
+// https://docs.soliditylang.org/en/v0.8.21/control-structures.html#panic-via-assert-and-error-via-require
+// the reason string list is copied from ether.js
+// https://github.com/ethers-io/ethers.js/blob/fa3a883ff7c88611ce766f58bdd4b8ac90814470/src.ts/abi/interface.ts#L207-L218
+var panicReasons = map[uint64]string{
+	0x00: "generic panic",
+	0x01: "assert(false)",
+	0x11: "arithmetic underflow or overflow",
+	0x12: "division or modulo by zero",
+	0x21: "enum overflow",
+	0x22: "invalid encoded storage byte array accessed",
+	0x31: "out-of-bounds array access; popping on an empty array",
+	0x32: "out-of-bounds access of an array or bytesN",
+	0x41: "out of memory",
+	0x51: "uninitialized function",
+}
+
 // UnpackRevert resolves the abi-encoded revert reason. According to the solidity
 // spec https://solidity.readthedocs.io/en/latest/control-structures.html#revert,
-// the provided revert reason is abi-encoded as if it were a call to a function
-// `Error(string)`. So it's a special tool for it.
+// the provided revert reason is abi-encoded as if it were a call to function
+// `Error(string)` or `Panic(uint256)`. So it's a special tool for it.
 func UnpackRevert(data []byte) (string, error) {
 	if len(data) < 4 {
 		return "", errors.New("invalid data for unpacking")
 	}
-	if !bytes.Equal(data[:4], revertSelector) {
+	switch {
+	case bytes.Equal(data[:4], revertSelector):
+		typ, err := NewType("string", "", nil)
+		if err != nil {
+			return "", err
+		}
+		unpacked, err := (Arguments{{Type: typ}}).Unpack(data[4:])
+		if err != nil {
+			return "", err
+		}
+		return unpacked[0].(string), nil
+	case bytes.Equal(data[:4], panicSelector):
+		typ, err := NewType("uint256", "", nil)
+		if err != nil {
+			return "", err
+		}
+		unpacked, err := (Arguments{{Type: typ}}).Unpack(data[4:])
+		if err != nil {
+			return "", err
+		}
+		pCode := unpacked[0].(*big.Int)
+		// uint64 safety check for future
+		// but the code is not bigger than MAX(uint64) now
+		if pCode.IsUint64() {
+			if reason, ok := panicReasons[pCode.Uint64()]; ok {
+				return reason, nil
+			}
+		}
+		return fmt.Sprintf("unknown panic code: %#x", pCode), nil
+	default:
 		return "", errors.New("invalid data for unpacking")
 	}
-	typ, _ := NewType("string", "", nil)
-	unpacked, err := (Arguments{{Type: typ}}).Unpack(data[4:])
-	if err != nil {
-		return "", err
-	}
-	return unpacked[0].(string), nil
 }
 
 // overloadedName returns the next available name for a given thing.

accounts/abi/abi_test.go

@@ -1141,6 +1141,8 @@ func TestUnpackRevert(t *testing.T) {
 		{"", "", errors.New("invalid data for unpacking")},
 		{"08c379a1", "", errors.New("invalid data for unpacking")},
 		{"08c379a00000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000d72657665727420726561736f6e00000000000000000000000000000000000000", "revert reason", nil},
+		{"4e487b710000000000000000000000000000000000000000000000000000000000000000", "generic panic", nil},
+		{"4e487b7100000000000000000000000000000000000000000000000000000000000000ff", "unknown panic code: 0xff", nil},
 	}
 	for index, c := range cases {
 		t.Run(fmt.Sprintf("case %d", index), func(t *testing.T) {