ipld-eth-server/pkg/omni/shared/helpers/test_helpers/mocks/parser.go

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// VulcanizeDB
// Copyright © 2018 Vulcanize
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program 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 Affero General Public License for more details.
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package mocks
import (
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/vulcanize/vulcanizedb/pkg/geth"
"github.com/vulcanize/vulcanizedb/pkg/omni/shared/types"
)
// Mock parser
// Is given ABI string instead of address
// Performs all other functions of the real parser
type parser struct {
abi string
parsedAbi abi.ABI
}
func NewParser(abi string) *parser {
return &parser{
abi: abi,
}
}
func (p *parser) Abi() string {
return p.abi
}
func (p *parser) ParsedAbi() abi.ABI {
return p.parsedAbi
}
// Retrieves and parses the abi string
// for the given contract address
func (p *parser) Parse() error {
var err error
p.parsedAbi, err = geth.ParseAbi(p.abi)
return err
}
// Returns wanted methods, if they meet the criteria, as map of types.Methods
// Empty wanted array => all methods that fit are returned
// Nil wanted array => no events are returned
func (p *parser) GetSelectMethods(wanted []string) map[string]types.Method {
addrMethods := map[string]types.Method{}
if wanted == nil {
return nil
}
for _, m := range p.parsedAbi.Methods {
if okInputTypes(m, wanted) {
wantedMethod := types.NewMethod(m)
addrMethods[wantedMethod.Name] = wantedMethod
}
}
return addrMethods
}
// Returns wanted events as map of types.Events
// If no events are specified, all events are returned
func (p *parser) GetEvents(wanted []string) map[string]types.Event {
events := map[string]types.Event{}
for _, e := range p.parsedAbi.Events {
if len(wanted) == 0 || stringInSlice(wanted, e.Name) {
event := types.NewEvent(e)
events[e.Name] = event
}
}
return events
}
func wantType(arg abi.Argument) bool {
wanted := []byte{abi.UintTy, abi.IntTy, abi.BoolTy, abi.StringTy, abi.AddressTy, abi.HashTy}
for _, ty := range wanted {
if arg.Type.T == ty {
return true
}
}
return false
}
func stringInSlice(list []string, s string) bool {
for _, b := range list {
if b == s {
return true
}
}
return false
}
func okInputTypes(m abi.Method, wanted []string) bool {
// 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)
if len(m.Inputs) < 3 && len(m.Outputs) == 1 && (len(wanted) == 0 || stringInSlice(wanted, m.Name)) {
// Only return methods if inputs are all of accepted types and output is of the accepted types
if !okReturnType(m.Outputs[0]) {
return false
}
for _, input := range m.Inputs {
switch input.Type.T {
case abi.AddressTy, abi.HashTy, abi.BytesTy, abi.FixedBytesTy:
default:
return false
}
}
return true
}
return false
}
func okReturnType(arg abi.Argument) bool {
wantedTypes := []byte{
abi.UintTy,
abi.IntTy,
abi.BoolTy,
abi.StringTy,
abi.AddressTy,
abi.HashTy,
abi.BytesTy,
abi.FixedBytesTy,
abi.FixedPointTy,
}
for _, ty := range wantedTypes {
if arg.Type.T == ty {
return true
}
}
return false
}