// Copyright 2015 The go-ethereum Authors // This file is part of the go-ethereum library. // // The go-ethereum library is free software: you can redistribute it and/or modify // it under the terms of the GNU Lesser General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // The go-ethereum library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU Lesser General Public License for more details. // // You should have received a copy of the GNU Lesser General Public License // along with the go-ethereum library. If not, see . package abi import ( "bytes" "encoding/hex" "fmt" "log" "math/big" "strings" "testing" "github.com/ethereum/go-ethereum/common" "github.com/ethereum/go-ethereum/crypto" ) const jsondata = ` [ { "type" : "function", "name" : "balance", "constant" : true }, { "type" : "function", "name" : "send", "constant" : false, "inputs" : [ { "name" : "amount", "type" : "uint256" } ] } ]` const jsondata2 = ` [ { "type" : "function", "name" : "balance", "constant" : true }, { "type" : "function", "name" : "send", "constant" : false, "inputs" : [ { "name" : "amount", "type" : "uint256" } ] }, { "type" : "function", "name" : "test", "constant" : false, "inputs" : [ { "name" : "number", "type" : "uint32" } ] }, { "type" : "function", "name" : "string", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "string" } ] }, { "type" : "function", "name" : "bool", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "bool" } ] }, { "type" : "function", "name" : "address", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "address" } ] }, { "type" : "function", "name" : "uint64[2]", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "uint64[2]" } ] }, { "type" : "function", "name" : "uint64[]", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "uint64[]" } ] }, { "type" : "function", "name" : "foo", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "uint32" } ] }, { "type" : "function", "name" : "bar", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "uint32" }, { "name" : "string", "type" : "uint16" } ] }, { "type" : "function", "name" : "slice", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "uint32[2]" } ] }, { "type" : "function", "name" : "slice256", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "uint256[2]" } ] }, { "type" : "function", "name" : "sliceAddress", "constant" : false, "inputs" : [ { "name" : "inputs", "type" : "address[]" } ] }, { "type" : "function", "name" : "sliceMultiAddress", "constant" : false, "inputs" : [ { "name" : "a", "type" : "address[]" }, { "name" : "b", "type" : "address[]" } ] } ]` func TestReader(t *testing.T) { Uint256, _ := NewType("uint256") exp := ABI{ Methods: map[string]Method{ "balance": { "balance", true, nil, nil, }, "send": { "send", false, []Argument{ {"amount", Uint256, false}, }, nil, }, }, } abi, err := JSON(strings.NewReader(jsondata)) if err != nil { t.Error(err) } // deep equal fails for some reason //t.Skip() // Check with String() instead expS := fmt.Sprintf("%v",exp) gotS := fmt.Sprintf("%v", abi) if expS != gotS { t.Errorf("\nGot abi: \n%v\ndoes not match expected \n%v", abi, exp) } } func TestTestNumbers(t *testing.T) { abi, err := JSON(strings.NewReader(jsondata2)) if err != nil { t.Error(err) t.FailNow() } if _, err := abi.Pack("balance"); err != nil { t.Error(err) } if _, err := abi.Pack("balance", 1); err == nil { t.Error("expected error for balance(1)") } if _, err := abi.Pack("doesntexist", nil); err == nil { t.Errorf("doesntexist shouldn't exist") } if _, err := abi.Pack("doesntexist", 1); err == nil { t.Errorf("doesntexist(1) shouldn't exist") } if _, err := abi.Pack("send", big.NewInt(1000)); err != nil { t.Error(err) } i := new(int) *i = 1000 if _, err := abi.Pack("send", i); err == nil { t.Errorf("expected send( ptr ) to throw, requires *big.Int instead of *int") } if _, err := abi.Pack("test", uint32(1000)); err != nil { t.Error(err) } } func TestTestString(t *testing.T) { abi, err := JSON(strings.NewReader(jsondata2)) if err != nil { t.Error(err) t.FailNow() } if _, err := abi.Pack("string", "hello world"); err != nil { t.Error(err) } } func TestTestBool(t *testing.T) { abi, err := JSON(strings.NewReader(jsondata2)) if err != nil { t.Error(err) t.FailNow() } if _, err := abi.Pack("bool", true); err != nil { t.Error(err) } } func TestTestSlice(t *testing.T) { abi, err := JSON(strings.NewReader(jsondata2)) if err != nil { t.Error(err) t.FailNow() } slice := make([]uint64, 2) if _, err := abi.Pack("uint64[2]", slice); err != nil { t.Error(err) } if _, err := abi.Pack("uint64[]", slice); err != nil { t.Error(err) } } func TestMethodSignature(t *testing.T) { String, _ := NewType("string") m := Method{"foo", false, []Argument{{"bar", String, false}, {"baz", String, false}}, nil} exp := "foo(string,string)" if m.Sig() != exp { t.Error("signature mismatch", exp, "!=", m.Sig()) } idexp := crypto.Keccak256([]byte(exp))[:4] if !bytes.Equal(m.Id(), idexp) { t.Errorf("expected ids to match %x != %x", m.Id(), idexp) } uintt, _ := NewType("uint256") m = Method{"foo", false, []Argument{{"bar", uintt, false}}, nil} exp = "foo(uint256)" if m.Sig() != exp { t.Error("signature mismatch", exp, "!=", m.Sig()) } } func TestMultiPack(t *testing.T) { abi, err := JSON(strings.NewReader(jsondata2)) if err != nil { t.Error(err) t.FailNow() } sig := crypto.Keccak256([]byte("bar(uint32,uint16)"))[:4] sig = append(sig, make([]byte, 64)...) sig[35] = 10 sig[67] = 11 packed, err := abi.Pack("bar", uint32(10), uint16(11)) if err != nil { t.Error(err) t.FailNow() } if !bytes.Equal(packed, sig) { t.Errorf("expected %x got %x", sig, packed) } } func ExampleJSON() { const definition = `[{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"isBar","outputs":[{"name":"","type":"bool"}],"type":"function"}]` abi, err := JSON(strings.NewReader(definition)) if err != nil { log.Fatalln(err) } out, err := abi.Pack("isBar", common.HexToAddress("01")) if err != nil { log.Fatalln(err) } fmt.Printf("%x\n", out) // Output: // 1f2c40920000000000000000000000000000000000000000000000000000000000000001 } func TestInputVariableInputLength(t *testing.T) { const definition = `[ { "type" : "function", "name" : "strOne", "constant" : true, "inputs" : [ { "name" : "str", "type" : "string" } ] }, { "type" : "function", "name" : "bytesOne", "constant" : true, "inputs" : [ { "name" : "str", "type" : "bytes" } ] }, { "type" : "function", "name" : "strTwo", "constant" : true, "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "str1", "type" : "string" } ] } ]` abi, err := JSON(strings.NewReader(definition)) if err != nil { t.Fatal(err) } // test one string strin := "hello world" strpack, err := abi.Pack("strOne", strin) if err != nil { t.Error(err) } offset := make([]byte, 32) offset[31] = 32 length := make([]byte, 32) length[31] = byte(len(strin)) value := common.RightPadBytes([]byte(strin), 32) exp := append(offset, append(length, value...)...) // ignore first 4 bytes of the output. This is the function identifier strpack = strpack[4:] if !bytes.Equal(strpack, exp) { t.Errorf("expected %x, got %x\n", exp, strpack) } // test one bytes btspack, err := abi.Pack("bytesOne", []byte(strin)) if err != nil { t.Error(err) } // ignore first 4 bytes of the output. This is the function identifier btspack = btspack[4:] if !bytes.Equal(btspack, exp) { t.Errorf("expected %x, got %x\n", exp, btspack) } // test two strings str1 := "hello" str2 := "world" str2pack, err := abi.Pack("strTwo", str1, str2) if err != nil { t.Error(err) } offset1 := make([]byte, 32) offset1[31] = 64 length1 := make([]byte, 32) length1[31] = byte(len(str1)) value1 := common.RightPadBytes([]byte(str1), 32) offset2 := make([]byte, 32) offset2[31] = 128 length2 := make([]byte, 32) length2[31] = byte(len(str2)) value2 := common.RightPadBytes([]byte(str2), 32) exp2 := append(offset1, offset2...) exp2 = append(exp2, append(length1, value1...)...) exp2 = append(exp2, append(length2, value2...)...) // ignore first 4 bytes of the output. This is the function identifier str2pack = str2pack[4:] if !bytes.Equal(str2pack, exp2) { t.Errorf("expected %x, got %x\n", exp, str2pack) } // test two strings, first > 32, second < 32 str1 = strings.Repeat("a", 33) str2pack, err = abi.Pack("strTwo", str1, str2) if err != nil { t.Error(err) } offset1 = make([]byte, 32) offset1[31] = 64 length1 = make([]byte, 32) length1[31] = byte(len(str1)) value1 = common.RightPadBytes([]byte(str1), 64) offset2[31] = 160 exp2 = append(offset1, offset2...) exp2 = append(exp2, append(length1, value1...)...) exp2 = append(exp2, append(length2, value2...)...) // ignore first 4 bytes of the output. This is the function identifier str2pack = str2pack[4:] if !bytes.Equal(str2pack, exp2) { t.Errorf("expected %x, got %x\n", exp, str2pack) } // test two strings, first > 32, second >32 str1 = strings.Repeat("a", 33) str2 = strings.Repeat("a", 33) str2pack, err = abi.Pack("strTwo", str1, str2) if err != nil { t.Error(err) } offset1 = make([]byte, 32) offset1[31] = 64 length1 = make([]byte, 32) length1[31] = byte(len(str1)) value1 = common.RightPadBytes([]byte(str1), 64) offset2 = make([]byte, 32) offset2[31] = 160 length2 = make([]byte, 32) length2[31] = byte(len(str2)) value2 = common.RightPadBytes([]byte(str2), 64) exp2 = append(offset1, offset2...) exp2 = append(exp2, append(length1, value1...)...) exp2 = append(exp2, append(length2, value2...)...) // ignore first 4 bytes of the output. This is the function identifier str2pack = str2pack[4:] if !bytes.Equal(str2pack, exp2) { t.Errorf("expected %x, got %x\n", exp, str2pack) } } func TestInputFixedArrayAndVariableInputLength(t *testing.T) { const definition = `[ { "type" : "function", "name" : "fixedArrStr", "constant" : true, "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "fixedArr", "type" : "uint256[2]" } ] }, { "type" : "function", "name" : "fixedArrBytes", "constant" : true, "inputs" : [ { "name" : "str", "type" : "bytes" }, { "name" : "fixedArr", "type" : "uint256[2]" } ] }, { "type" : "function", "name" : "mixedArrStr", "constant" : true, "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "fixedArr", "type": "uint256[2]" }, { "name" : "dynArr", "type": "uint256[]" } ] }, { "type" : "function", "name" : "doubleFixedArrStr", "constant" : true, "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "fixedArr1", "type": "uint256[2]" }, { "name" : "fixedArr2", "type": "uint256[3]" } ] }, { "type" : "function", "name" : "multipleMixedArrStr", "constant" : true, "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "fixedArr1", "type": "uint256[2]" }, { "name" : "dynArr", "type" : "uint256[]" }, { "name" : "fixedArr2", "type" : "uint256[3]" } ] } ]` abi, err := JSON(strings.NewReader(definition)) if err != nil { t.Error(err) } // test string, fixed array uint256[2] strin := "hello world" arrin := [2]*big.Int{big.NewInt(1), big.NewInt(2)} fixedArrStrPack, err := abi.Pack("fixedArrStr", strin, arrin) if err != nil { t.Error(err) } // generate expected output offset := make([]byte, 32) offset[31] = 96 length := make([]byte, 32) length[31] = byte(len(strin)) strvalue := common.RightPadBytes([]byte(strin), 32) arrinvalue1 := common.LeftPadBytes(arrin[0].Bytes(), 32) arrinvalue2 := common.LeftPadBytes(arrin[1].Bytes(), 32) exp := append(offset, arrinvalue1...) exp = append(exp, arrinvalue2...) exp = append(exp, append(length, strvalue...)...) // ignore first 4 bytes of the output. This is the function identifier fixedArrStrPack = fixedArrStrPack[4:] if !bytes.Equal(fixedArrStrPack, exp) { t.Errorf("expected %x, got %x\n", exp, fixedArrStrPack) } // test byte array, fixed array uint256[2] bytesin := []byte(strin) arrin = [2]*big.Int{big.NewInt(1), big.NewInt(2)} fixedArrBytesPack, err := abi.Pack("fixedArrBytes", bytesin, arrin) if err != nil { t.Error(err) } // generate expected output offset = make([]byte, 32) offset[31] = 96 length = make([]byte, 32) length[31] = byte(len(strin)) strvalue = common.RightPadBytes([]byte(strin), 32) arrinvalue1 = common.LeftPadBytes(arrin[0].Bytes(), 32) arrinvalue2 = common.LeftPadBytes(arrin[1].Bytes(), 32) exp = append(offset, arrinvalue1...) exp = append(exp, arrinvalue2...) exp = append(exp, append(length, strvalue...)...) // ignore first 4 bytes of the output. This is the function identifier fixedArrBytesPack = fixedArrBytesPack[4:] if !bytes.Equal(fixedArrBytesPack, exp) { t.Errorf("expected %x, got %x\n", exp, fixedArrBytesPack) } // test string, fixed array uint256[2], dynamic array uint256[] strin = "hello world" fixedarrin := [2]*big.Int{big.NewInt(1), big.NewInt(2)} dynarrin := []*big.Int{big.NewInt(1), big.NewInt(2), big.NewInt(3)} mixedArrStrPack, err := abi.Pack("mixedArrStr", strin, fixedarrin, dynarrin) if err != nil { t.Error(err) } // generate expected output stroffset := make([]byte, 32) stroffset[31] = 128 strlength := make([]byte, 32) strlength[31] = byte(len(strin)) strvalue = common.RightPadBytes([]byte(strin), 32) fixedarrinvalue1 := common.LeftPadBytes(fixedarrin[0].Bytes(), 32) fixedarrinvalue2 := common.LeftPadBytes(fixedarrin[1].Bytes(), 32) dynarroffset := make([]byte, 32) dynarroffset[31] = byte(160 + ((len(strin)/32)+1)*32) dynarrlength := make([]byte, 32) dynarrlength[31] = byte(len(dynarrin)) dynarrinvalue1 := common.LeftPadBytes(dynarrin[0].Bytes(), 32) dynarrinvalue2 := common.LeftPadBytes(dynarrin[1].Bytes(), 32) dynarrinvalue3 := common.LeftPadBytes(dynarrin[2].Bytes(), 32) exp = append(stroffset, fixedarrinvalue1...) exp = append(exp, fixedarrinvalue2...) exp = append(exp, dynarroffset...) exp = append(exp, append(strlength, strvalue...)...) dynarrarg := append(dynarrlength, dynarrinvalue1...) dynarrarg = append(dynarrarg, dynarrinvalue2...) dynarrarg = append(dynarrarg, dynarrinvalue3...) exp = append(exp, dynarrarg...) // ignore first 4 bytes of the output. This is the function identifier mixedArrStrPack = mixedArrStrPack[4:] if !bytes.Equal(mixedArrStrPack, exp) { t.Errorf("expected %x, got %x\n", exp, mixedArrStrPack) } // test string, fixed array uint256[2], fixed array uint256[3] strin = "hello world" fixedarrin1 := [2]*big.Int{big.NewInt(1), big.NewInt(2)} fixedarrin2 := [3]*big.Int{big.NewInt(1), big.NewInt(2), big.NewInt(3)} doubleFixedArrStrPack, err := abi.Pack("doubleFixedArrStr", strin, fixedarrin1, fixedarrin2) if err != nil { t.Error(err) } // generate expected output stroffset = make([]byte, 32) stroffset[31] = 192 strlength = make([]byte, 32) strlength[31] = byte(len(strin)) strvalue = common.RightPadBytes([]byte(strin), 32) fixedarrin1value1 := common.LeftPadBytes(fixedarrin1[0].Bytes(), 32) fixedarrin1value2 := common.LeftPadBytes(fixedarrin1[1].Bytes(), 32) fixedarrin2value1 := common.LeftPadBytes(fixedarrin2[0].Bytes(), 32) fixedarrin2value2 := common.LeftPadBytes(fixedarrin2[1].Bytes(), 32) fixedarrin2value3 := common.LeftPadBytes(fixedarrin2[2].Bytes(), 32) exp = append(stroffset, fixedarrin1value1...) exp = append(exp, fixedarrin1value2...) exp = append(exp, fixedarrin2value1...) exp = append(exp, fixedarrin2value2...) exp = append(exp, fixedarrin2value3...) exp = append(exp, append(strlength, strvalue...)...) // ignore first 4 bytes of the output. This is the function identifier doubleFixedArrStrPack = doubleFixedArrStrPack[4:] if !bytes.Equal(doubleFixedArrStrPack, exp) { t.Errorf("expected %x, got %x\n", exp, doubleFixedArrStrPack) } // test string, fixed array uint256[2], dynamic array uint256[], fixed array uint256[3] strin = "hello world" fixedarrin1 = [2]*big.Int{big.NewInt(1), big.NewInt(2)} dynarrin = []*big.Int{big.NewInt(1), big.NewInt(2)} fixedarrin2 = [3]*big.Int{big.NewInt(1), big.NewInt(2), big.NewInt(3)} multipleMixedArrStrPack, err := abi.Pack("multipleMixedArrStr", strin, fixedarrin1, dynarrin, fixedarrin2) if err != nil { t.Error(err) } // generate expected output stroffset = make([]byte, 32) stroffset[31] = 224 strlength = make([]byte, 32) strlength[31] = byte(len(strin)) strvalue = common.RightPadBytes([]byte(strin), 32) fixedarrin1value1 = common.LeftPadBytes(fixedarrin1[0].Bytes(), 32) fixedarrin1value2 = common.LeftPadBytes(fixedarrin1[1].Bytes(), 32) dynarroffset = U256(big.NewInt(int64(256 + ((len(strin)/32)+1)*32))) dynarrlength = make([]byte, 32) dynarrlength[31] = byte(len(dynarrin)) dynarrinvalue1 = common.LeftPadBytes(dynarrin[0].Bytes(), 32) dynarrinvalue2 = common.LeftPadBytes(dynarrin[1].Bytes(), 32) fixedarrin2value1 = common.LeftPadBytes(fixedarrin2[0].Bytes(), 32) fixedarrin2value2 = common.LeftPadBytes(fixedarrin2[1].Bytes(), 32) fixedarrin2value3 = common.LeftPadBytes(fixedarrin2[2].Bytes(), 32) exp = append(stroffset, fixedarrin1value1...) exp = append(exp, fixedarrin1value2...) exp = append(exp, dynarroffset...) exp = append(exp, fixedarrin2value1...) exp = append(exp, fixedarrin2value2...) exp = append(exp, fixedarrin2value3...) exp = append(exp, append(strlength, strvalue...)...) dynarrarg = append(dynarrlength, dynarrinvalue1...) dynarrarg = append(dynarrarg, dynarrinvalue2...) exp = append(exp, dynarrarg...) // ignore first 4 bytes of the output. This is the function identifier multipleMixedArrStrPack = multipleMixedArrStrPack[4:] if !bytes.Equal(multipleMixedArrStrPack, exp) { t.Errorf("expected %x, got %x\n", exp, multipleMixedArrStrPack) } } func TestDefaultFunctionParsing(t *testing.T) { const definition = `[{ "name" : "balance" }]` abi, err := JSON(strings.NewReader(definition)) if err != nil { t.Fatal(err) } if _, ok := abi.Methods["balance"]; !ok { t.Error("expected 'balance' to be present") } } func TestBareEvents(t *testing.T) { const definition = `[ { "type" : "event", "name" : "balance" }, { "type" : "event", "name" : "anon", "anonymous" : true}, { "type" : "event", "name" : "args", "inputs" : [{ "indexed":false, "name":"arg0", "type":"uint256" }, { "indexed":true, "name":"arg1", "type":"address" }] } ]` arg0, _ := NewType("uint256") arg1, _ := NewType("address") expectedEvents := map[string]struct { Anonymous bool Args []Argument }{ "balance": {false, nil}, "anon": {true, nil}, "args": {false, []Argument{ {Name: "arg0", Type: arg0, Indexed: false}, {Name: "arg1", Type: arg1, Indexed: true}, }}, } abi, err := JSON(strings.NewReader(definition)) if err != nil { t.Fatal(err) } if len(abi.Events) != len(expectedEvents) { t.Fatalf("invalid number of events after parsing, want %d, got %d", len(expectedEvents), len(abi.Events)) } for name, exp := range expectedEvents { got, ok := abi.Events[name] if !ok { t.Errorf("could not found event %s", name) continue } if got.Anonymous != exp.Anonymous { t.Errorf("invalid anonymous indication for event %s, want %v, got %v", name, exp.Anonymous, got.Anonymous) } if len(got.Inputs) != len(exp.Args) { t.Errorf("invalid number of args, want %d, got %d", len(exp.Args), len(got.Inputs)) continue } for i, arg := range exp.Args { if arg.Name != got.Inputs[i].Name { t.Errorf("events[%s].Input[%d] has an invalid name, want %s, got %s", name, i, arg.Name, got.Inputs[i].Name) } if arg.Indexed != got.Inputs[i].Indexed { t.Errorf("events[%s].Input[%d] has an invalid indexed indication, want %v, got %v", name, i, arg.Indexed, got.Inputs[i].Indexed) } if arg.Type.T != got.Inputs[i].Type.T { t.Errorf("events[%s].Input[%d] has an invalid type, want %x, got %x", name, i, arg.Type.T, got.Inputs[i].Type.T) } } } } // TestUnpackEvent is based on this contract: // contract T { // event received(address sender, uint amount, bytes memo); // function receive(bytes memo) external payable { // received(msg.sender, msg.value, memo); // } // } // When receive("X") is called with sender 0x00... and value 1, it produces this tx receipt: // receipt{status=1 cgas=23949 bloom=00000000004000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000040200000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 logs=[log: b6818c8064f645cd82d99b59a1a267d6d61117ef [75fd880d39c1daf53b6547ab6cb59451fc6452d27caa90e5b6649dd8293b9eed] 000000000000000000000000376c47978271565f56deb45495afa69e59c16ab200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000000158 9ae378b6d4409eada347a5dc0c180f186cb62dc68fcc0f043425eb917335aa28 0 95d429d309bb9d753954195fe2d69bd140b4ae731b9b5b605c34323de162cf00 0]} func TestUnpackEvent(t *testing.T) { const abiJSON = `[{"constant":false,"inputs":[{"name":"memo","type":"bytes"}],"name":"receive","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"anonymous":false,"inputs":[{"indexed":false,"name":"sender","type":"address"},{"indexed":false,"name":"amount","type":"uint256"},{"indexed":false,"name":"memo","type":"bytes"}],"name":"received","type":"event"}]` abi, err := JSON(strings.NewReader(abiJSON)) if err != nil { t.Fatal(err) } const hexdata = `000000000000000000000000376c47978271565f56deb45495afa69e59c16ab200000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000000158` data, err := hex.DecodeString(hexdata) if err != nil { t.Fatal(err) } if len(data)%32 == 0 { t.Errorf("len(data) is %d, want a non-multiple of 32", len(data)) } type ReceivedEvent struct { Address common.Address Amount *big.Int Memo []byte } var ev ReceivedEvent err = abi.Unpack(&ev, "received", data) if err != nil { t.Error(err) } else { t.Logf("len(data): %d; received event: %+v", len(data), ev) } }