163 lines
3.8 KiB
Go
163 lines
3.8 KiB
Go
// VulcanizeDB
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// Copyright © 2019 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package mocks
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import (
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"github.com/ethereum/go-ethereum/accounts/abi"
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"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/types"
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"github.com/vulcanize/vulcanizedb/pkg/eth"
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)
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// Mock parser
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// Is given ABI string instead of address
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// Performs all other functions of the real parser
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type parser struct {
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abi string
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parsedAbi abi.ABI
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}
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func NewParser(abi string) *parser {
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return &parser{
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abi: abi,
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}
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}
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func (p *parser) Abi() string {
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return p.abi
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}
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func (p *parser) ParsedAbi() abi.ABI {
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return p.parsedAbi
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}
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// Retrieves and parses the abi string
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// for the given contract address
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func (p *parser) Parse() error {
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var err error
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p.parsedAbi, err = eth.ParseAbi(p.abi)
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return err
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}
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// Returns only specified methods, if they meet the criteria
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// Returns as array with methods in same order they were specified
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// Nil wanted array => no events are returned
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func (p *parser) GetSelectMethods(wanted []string) []types.Method {
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wLen := len(wanted)
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if wLen == 0 {
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return nil
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}
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methods := make([]types.Method, wLen)
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for _, m := range p.parsedAbi.Methods {
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for i, name := range wanted {
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if name == m.Name && okTypes(m, wanted) {
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methods[i] = types.NewMethod(m)
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}
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}
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}
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return methods
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}
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// Returns wanted methods
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// Empty wanted array => all methods are returned
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// Nil wanted array => no methods are returned
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func (p *parser) GetMethods(wanted []string) []types.Method {
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if wanted == nil {
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return nil
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}
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methods := make([]types.Method, 0)
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length := len(wanted)
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for _, m := range p.parsedAbi.Methods {
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if length == 0 || stringInSlice(wanted, m.Name) {
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methods = append(methods, types.NewMethod(m))
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}
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}
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return methods
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}
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// Returns wanted events as map of types.Events
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// If no events are specified, all events are returned
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func (p *parser) GetEvents(wanted []string) map[string]types.Event {
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events := map[string]types.Event{}
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for _, e := range p.parsedAbi.Events {
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if len(wanted) == 0 || stringInSlice(wanted, e.Name) {
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event := types.NewEvent(e)
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events[e.Name] = event
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}
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}
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return events
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}
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func stringInSlice(list []string, s string) bool {
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for _, b := range list {
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if b == s {
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return true
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}
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}
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return false
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}
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func okTypes(m abi.Method, wanted []string) bool {
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// Only return method if it has less than 3 arguments, a single output value, and it is a method we want or we want all methods (empty 'wanted' slice)
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if len(m.Inputs) < 3 && len(m.Outputs) == 1 && (len(wanted) == 0 || stringInSlice(wanted, m.Name)) {
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// Only return methods if inputs are all of accepted types and output is of the accepted types
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if !okReturnType(m.Outputs[0]) {
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return false
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}
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for _, input := range m.Inputs {
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switch input.Type.T {
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case abi.AddressTy, abi.HashTy, abi.BytesTy, abi.FixedBytesTy:
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default:
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return false
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}
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}
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return true
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}
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return false
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}
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func okReturnType(arg abi.Argument) bool {
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wantedTypes := []byte{
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abi.UintTy,
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abi.IntTy,
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abi.BoolTy,
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abi.StringTy,
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abi.AddressTy,
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abi.HashTy,
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abi.BytesTy,
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abi.FixedBytesTy,
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abi.FixedPointTy,
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}
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for _, ty := range wantedTypes {
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if arg.Type.T == ty {
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return true
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}
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}
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return false
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}
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