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contract_mock_receiver.go
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contract_mock_receiver.go
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package cltest
import (
"errors"
"reflect"
"testing"
"github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
evmmocks "github.com/smartcontractkit/chainlink/core/chains/evm/mocks"
"github.com/stretchr/testify/mock"
"github.com/stretchr/testify/require"
)
// funcSigLength is the length of the function signature (including the 0x)
// ex: 0x1234ABCD
const funcSigLength = 10
func NewContractMockReceiver(t *testing.T, ethMock *evmmocks.Client, abi abi.ABI, address common.Address) contractMockReceiver {
return contractMockReceiver{
t: t,
ethMock: ethMock,
abi: abi,
address: address,
}
}
type contractMockReceiver struct {
t *testing.T
ethMock *evmmocks.Client
abi abi.ABI
address common.Address
}
func (receiver contractMockReceiver) MockResponse(funcName string, responseArgs ...interface{}) *mock.Call {
funcSig := hexutil.Encode(receiver.abi.Methods[funcName].ID)
if len(funcSig) != funcSigLength {
receiver.t.Fatalf("Unable to find Registry contract function with name %s", funcName)
}
encoded := receiver.mustEncodeResponse(funcName, responseArgs...)
return receiver.ethMock.
On(
"CallContract",
mock.Anything,
mock.MatchedBy(func(callArgs ethereum.CallMsg) bool {
return *callArgs.To == receiver.address &&
hexutil.Encode(callArgs.Data)[0:funcSigLength] == funcSig
}),
mock.Anything).
Return(encoded, nil)
}
func (receiver contractMockReceiver) MockMatchedResponse(funcName string, matcher func(callArgs ethereum.CallMsg) bool, responseArgs ...interface{}) *mock.Call {
funcSig := hexutil.Encode(receiver.abi.Methods[funcName].ID)
if len(funcSig) != funcSigLength {
receiver.t.Fatalf("Unable to find Registry contract function with name %s", funcName)
}
encoded := receiver.mustEncodeResponse(funcName, responseArgs...)
return receiver.ethMock.
On(
"CallContract",
mock.Anything,
mock.MatchedBy(func(callArgs ethereum.CallMsg) bool {
return *callArgs.To == receiver.address &&
hexutil.Encode(callArgs.Data)[0:funcSigLength] == funcSig &&
matcher(callArgs)
}),
mock.Anything).
Return(encoded, nil)
}
func (receiver contractMockReceiver) MockRevertResponse(funcName string) *mock.Call {
funcSig := hexutil.Encode(receiver.abi.Methods[funcName].ID)
if len(funcSig) != funcSigLength {
receiver.t.Fatalf("Unable to find Registry contract function with name %s", funcName)
}
return receiver.ethMock.
On(
"CallContract",
mock.Anything,
mock.MatchedBy(func(callArgs ethereum.CallMsg) bool {
return *callArgs.To == receiver.address &&
hexutil.Encode(callArgs.Data)[0:funcSigLength] == funcSig
}),
mock.Anything).
Return(nil, errors.New("revert"))
}
func (receiver contractMockReceiver) mustEncodeResponse(funcName string, responseArgs ...interface{}) []byte {
if len(responseArgs) == 0 {
return []byte{}
}
var outputList []interface{}
firstArg := responseArgs[0]
isStruct := reflect.TypeOf(firstArg).Kind() == reflect.Struct
if isStruct && len(responseArgs) > 1 {
receiver.t.Fatal("cannot encode response with struct and multiple return values")
} else if isStruct {
outputList = structToInterfaceSlice(firstArg)
} else {
outputList = responseArgs
}
encoded, err := receiver.abi.Methods[funcName].Outputs.PackValues(outputList)
require.NoError(receiver.t, err)
return encoded
}
func structToInterfaceSlice(structArg interface{}) []interface{} {
v := reflect.ValueOf(structArg)
values := make([]interface{}, v.NumField())
for i := 0; i < v.NumField(); i++ {
values[i] = v.Field(i).Interface()
}
return values
}