path: root/accounts/abi/event_test.go

// Copyright 2016 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 <http://www.gnu.org/licenses/>.

package abi

import (
    "bytes"
    "encoding/hex"
    "encoding/json"
    "math/big"
    "reflect"
    "strings"
    "testing"

    "github.com/dexon-foundation/dexon/common"
    "github.com/dexon-foundation/dexon/crypto"
    "github.com/stretchr/testify/assert"
    "github.com/stretchr/testify/require"
)

var jsonEventTransfer = []byte(`{
  "anonymous": false,
  "inputs": [
    {
      "indexed": true, "name": "from", "type": "address"
    }, {
      "indexed": true, "name": "to", "type": "address"
    }, {
      "indexed": false, "name": "value", "type": "uint256"
  }],
  "name": "Transfer",
  "type": "event"
}`)

var jsonEventPledge = []byte(`{
  "anonymous": false,
  "inputs": [{
      "indexed": false, "name": "who", "type": "address"
    }, {
      "indexed": false, "name": "wad", "type": "uint128"
    }, {
      "indexed": false, "name": "currency", "type": "bytes3"
  }],
  "name": "Pledge",
  "type": "event"
}`)

var jsonEventMixedCase = []byte(`{
    "anonymous": false,
    "inputs": [{
        "indexed": false, "name": "value", "type": "uint256"
      }, {
        "indexed": false, "name": "_value", "type": "uint256"
      }, {
        "indexed": false, "name": "Value", "type": "uint256"
    }],
    "name": "MixedCase",
    "type": "event"
  }`)

// 1000000
var transferData1 = "00000000000000000000000000000000000000000000000000000000000f4240"

// "0x00Ce0d46d924CC8437c806721496599FC3FFA268", 2218516807680, "usd"
var pledgeData1 = "00000000000000000000000000ce0d46d924cc8437c806721496599fc3ffa2680000000000000000000000000000000000000000000000000000020489e800007573640000000000000000000000000000000000000000000000000000000000"

// 1000000,2218516807680,1000001
var mixedCaseData1 = "00000000000000000000000000000000000000000000000000000000000f42400000000000000000000000000000000000000000000000000000020489e8000000000000000000000000000000000000000000000000000000000000000f4241"

func TestEventId(t *testing.T) {
    var table = []struct {
        definition   string
        expectations map[string]common.Hash
    }{
        {
            definition: `[
            { "type" : "event", "name" : "Balance", "inputs": [{ "name" : "in", "type": "uint256" }] },
            { "type" : "event", "name" : "Check", "inputs": [{ "name" : "t", "type": "address" }, { "name": "b", "type": "uint256" }] }
            ]`,
            expectations: map[string]common.Hash{
                "Balance": crypto.Keccak256Hash([]byte("Balance(uint256)")),
                "Check":   crypto.Keccak256Hash([]byte("Check(address,uint256)")),
            },
        },
    }

    for _, test := range table {
        abi, err := JSON(strings.NewReader(test.definition))
        if err != nil {
            t.Fatal(err)
        }

        for name, event := range abi.Events {
            if event.Id() != test.expectations[name] {
                t.Errorf("expected id to be %x, got %x", test.expectations[name], event.Id())
            }
        }
    }
}

func TestEventString(t *testing.T) {
    var table = []struct {
        definition   string
        expectations map[string]string
    }{
        {
            definition: `[
            { "type" : "event", "name" : "Balance", "inputs": [{ "name" : "in", "type": "uint256" }] },
            { "type" : "event", "name" : "Check", "inputs": [{ "name" : "t", "type": "address" }, { "name": "b", "type": "uint256" }] },
            { "type" : "event", "name" : "Transfer", "inputs": [{ "name": "from", "type": "address", "indexed": true }, { "name": "to", "type": "address", "indexed": true }, { "name": "value", "type": "uint256" }] }
            ]`,
            expectations: map[string]string{
                "Balance":  "event Balance(uint256 in)",
                "Check":    "event Check(address t, uint256 b)",
                "Transfer": "event Transfer(address indexed from, address indexed to, uint256 value)",
            },
        },
    }

    for _, test := range table {
        abi, err := JSON(strings.NewReader(test.definition))
        if err != nil {
            t.Fatal(err)
        }

        for name, event := range abi.Events {
            if event.String() != test.expectations[name] {
                t.Errorf("expected string to be %s, got %s", test.expectations[name], event.String())
            }
        }
    }
}

// TestEventMultiValueWithArrayUnpack verifies that array fields will be counted after parsing array.
func TestEventMultiValueWithArrayUnpack(t *testing.T) {
    definition := `[{"name": "test", "type": "event", "inputs": [{"indexed": false, "name":"value1", "type":"uint8[2]"},{"indexed": false, "name":"value2", "type":"uint8"}]}]`
    type testStruct struct {
        Value1 [2]uint8
        Value2 uint8
    }
    abi, err := JSON(strings.NewReader(definition))
    require.NoError(t, err)
    var b bytes.Buffer
    var i uint8 = 1
    for ; i <= 3; i++ {
        b.Write(packNum(reflect.ValueOf(i)))
    }
    var rst testStruct
    require.NoError(t, abi.Unpack(&rst, "test", b.Bytes()))
    require.Equal(t, [2]uint8{1, 2}, rst.Value1)
    require.Equal(t, uint8(3), rst.Value2)
}

func TestEventTupleUnpack(t *testing.T) {

    type EventTransfer struct {
        Value *big.Int
    }

    type EventTransferWithTag struct {
        // this is valid because `value` is not exportable,
        // so value is only unmarshalled into `Value1`.
        value  *big.Int
        Value1 *big.Int `abi:"value"`
    }

    type BadEventTransferWithSameFieldAndTag struct {
        Value  *big.Int
        Value1 *big.Int `abi:"value"`
    }

    type BadEventTransferWithDuplicatedTag struct {
        Value1 *big.Int `abi:"value"`
        Value2 *big.Int `abi:"value"`
    }

    type BadEventTransferWithEmptyTag struct {
        Value *big.Int `abi:""`
    }

    type EventPledge struct {
        Who      common.Address
        Wad      *big.Int
        Currency [3]byte
    }

    type BadEventPledge struct {
        Who      string
        Wad      int
        Currency [3]byte
    }

    type EventMixedCase struct {
        Value1 *big.Int `abi:"value"`
        Value2 *big.Int `abi:"_value"`
        Value3 *big.Int `abi:"Value"`
    }

    bigint := new(big.Int)
    bigintExpected := big.NewInt(1000000)
    bigintExpected2 := big.NewInt(2218516807680)
    bigintExpected3 := big.NewInt(1000001)
    addr := common.HexToAddress("0x00Ce0d46d924CC8437c806721496599FC3FFA268")
    var testCases = []struct {
        data     string
        dest     interface{}
        expected interface{}
        jsonLog  []byte
        error    string
        name     string
    }{{
        transferData1,
        &EventTransfer{},
        &EventTransfer{Value: bigintExpected},
        jsonEventTransfer,
        "",
        "Can unpack ERC20 Transfer event into structure",
    }, {
        transferData1,
        &[]interface{}{&bigint},
        &[]interface{}{&bigintExpected},
        jsonEventTransfer,
        "",
        "Can unpack ERC20 Transfer event into slice",
    }, {
        transferData1,
        &EventTransferWithTag{},
        &EventTransferWithTag{Value1: bigintExpected},
        jsonEventTransfer,
        "",
        "Can unpack ERC20 Transfer event into structure with abi: tag",
    }, {
        transferData1,
        &BadEventTransferWithDuplicatedTag{},
        &BadEventTransferWithDuplicatedTag{},
        jsonEventTransfer,
        "struct: abi tag in 'Value2' already mapped",
        "Can not unpack ERC20 Transfer event with duplicated abi tag",
    }, {
        transferData1,
        &BadEventTransferWithSameFieldAndTag{},
        &BadEventTransferWithSameFieldAndTag{},
        jsonEventTransfer,
        "abi: multiple variables maps to the same abi field 'value'",
        "Can not unpack ERC20 Transfer event with a field and a tag mapping to the same abi variable",
    }, {
        transferData1,
        &BadEventTransferWithEmptyTag{},
        &BadEventTransferWithEmptyTag{},
        jsonEventTransfer,
        "struct: abi tag in 'Value' is empty",
        "Can not unpack ERC20 Transfer event with an empty tag",
    }, {
        pledgeData1,
        &EventPledge{},
        &EventPledge{
            addr,
            bigintExpected2,
            [3]byte{'u', 's', 'd'}},
        jsonEventPledge,
        "",
        "Can unpack Pledge event into structure",
    }, {
        pledgeData1,
        &[]interface{}{&common.Address{}, &bigint, &[3]byte{}},
        &[]interface{}{
            &addr,
            &bigintExpected2,
            &[3]byte{'u', 's', 'd'}},
        jsonEventPledge,
        "",
        "Can unpack Pledge event into slice",
    }, {
        pledgeData1,
        &[3]interface{}{&common.Address{}, &bigint, &[3]byte{}},
        &[3]interface{}{
            &addr,
            &bigintExpected2,
            &[3]byte{'u', 's', 'd'}},
        jsonEventPledge,
        "",
        "Can unpack Pledge event into an array",
    }, {
        pledgeData1,
        &[]interface{}{new(int), 0, 0},
        &[]interface{}{},
        jsonEventPledge,
        "abi: cannot unmarshal common.Address in to int",
        "Can not unpack Pledge event into slice with wrong types",
    }, {
        pledgeData1,
        &BadEventPledge{},
        &BadEventPledge{},
        jsonEventPledge,
        "abi: cannot unmarshal common.Address in to string",
        "Can not unpack Pledge event into struct with wrong filed types",
    }, {
        pledgeData1,
        &[]interface{}{common.Address{}, new(big.Int)},
        &[]interface{}{},
        jsonEventPledge,
        "abi: insufficient number of elements in the list/array for unpack, want 3, got 2",
        "Can not unpack Pledge event into too short slice",
    }, {
        pledgeData1,
        new(map[string]interface{}),
        &[]interface{}{},
        jsonEventPledge,
        "abi: cannot unmarshal tuple into map[string]interface {}",
        "Can not unpack Pledge event into map",
    }, {
        mixedCaseData1,
        &EventMixedCase{},
        &EventMixedCase{Value1: bigintExpected, Value2: bigintExpected2, Value3: bigintExpected3},
        jsonEventMixedCase,
        "",
        "Can unpack abi variables with mixed case",
    }}

    for _, tc := range testCases {
        assert := assert.New(t)
        tc := tc
        t.Run(tc.name, func(t *testing.T) {
            err := unpackTestEventData(tc.dest, tc.data, tc.jsonLog, assert)
            if tc.error == "" {
                assert.Nil(err, "Should be able to unpack event data.")
                assert.Equal(tc.expected, tc.dest, tc.name)
            } else {
                assert.EqualError(err, tc.error, tc.name)
            }
        })
    }
}

func unpackTestEventData(dest interface{}, hexData string, jsonEvent []byte, assert *assert.Assertions) error {
    data, err := hex.DecodeString(hexData)
    assert.NoError(err, "Hex data should be a correct hex-string")
    var e Event
    assert.NoError(json.Unmarshal(jsonEvent, &e), "Should be able to unmarshal event ABI")
    a := ABI{Events: map[string]Event{"e": e}}
    return a.Unpack(dest, "e", data)
}

/*
Taken from
https://github.com/dexon-foundation/dexon/pull/15568
*/

type testResult struct {
    Values [2]*big.Int
    Value1 *big.Int
    Value2 *big.Int
}

type testCase struct {
    definition string
    want       testResult
}

func (tc testCase) encoded(intType, arrayType Type) []byte {
    var b bytes.Buffer
    if tc.want.Value1 != nil {
        val, _ := intType.pack(reflect.ValueOf(tc.want.Value1))
        b.Write(val)
    }

    if !reflect.DeepEqual(tc.want.Values, [2]*big.Int{nil, nil}) {
        val, _ := arrayType.pack(reflect.ValueOf(tc.want.Values))
        b.Write(val)
    }
    if tc.want.Value2 != nil {
        val, _ := intType.pack(reflect.ValueOf(tc.want.Value2))
        b.Write(val)
    }
    return b.Bytes()
}

// TestEventUnpackIndexed verifies that indexed field will be skipped by event decoder.
func TestEventUnpackIndexed(t *testing.T) {
    definition := `[{"name": "test", "type": "event", "inputs": [{"indexed": true, "name":"value1", "type":"uint8"},{"indexed": false, "name":"value2", "type":"uint8"}]}]`
    type testStruct struct {
        Value1 uint8
        Value2 uint8
    }
    abi, err := JSON(strings.NewReader(definition))
    require.NoError(t, err)
    var b bytes.Buffer
    b.Write(packNum(reflect.ValueOf(uint8(8))))
    var rst testStruct
    require.NoError(t, abi.Unpack(&rst, "test", b.Bytes()))
    require.Equal(t, uint8(0), rst.Value1)
    require.Equal(t, uint8(8), rst.Value2)
}

// TestEventIndexedWithArrayUnpack verifies that decoder will not overlow when static array is indexed input.
func TestEventIndexedWithArrayUnpack(t *testing.T) {
    definition := `[{"name": "test", "type": "event", "inputs": [{"indexed": true, "name":"value1", "type":"uint8[2]"},{"indexed": false, "name":"value2", "type":"string"}]}]`
    type testStruct struct {
        Value1 [2]uint8
        Value2 string
    }
    abi, err := JSON(strings.NewReader(definition))
    require.NoError(t, err)
    var b bytes.Buffer
    stringOut := "abc"
    // number of fields that will be encoded * 32
    b.Write(packNum(reflect.ValueOf(32)))
    b.Write(packNum(reflect.ValueOf(len(stringOut))))
    b.Write(common.RightPadBytes([]byte(stringOut), 32))

    var rst testStruct
    require.NoError(t, abi.Unpack(&rst, "test", b.Bytes()))
    require.Equal(t, [2]uint8{0, 0}, rst.Value1)
    require.Equal(t, stringOut, rst.Value2)
}