114 lines
4.1 KiB
Go
114 lines
4.1 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 getter
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import (
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"fmt"
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"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/constants"
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"github.com/vulcanize/vulcanizedb/pkg/contract_watcher/shared/fetcher"
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"github.com/vulcanize/vulcanizedb/pkg/core"
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)
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// InterfaceGetter is used to derive the interface of a contract
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type InterfaceGetter interface {
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GetABI(resolverAddr string, blockNumber int64) (string, error)
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GetBlockChain() core.BlockChain
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}
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type interfaceGetter struct {
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fetcher.Fetcher
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}
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// NewInterfaceGetter returns a new InterfaceGetter
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func NewInterfaceGetter(blockChain core.BlockChain) InterfaceGetter {
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return &interfaceGetter{
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Fetcher: fetcher.Fetcher{
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BlockChain: blockChain,
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},
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}
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}
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// GetABI is used to construct a custom ABI based on the results from calling supportsInterface
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func (g *interfaceGetter) GetABI(resolverAddr string, blockNumber int64) (string, error) {
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a := constants.SupportsInterfaceABI
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args := make([]interface{}, 1)
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args[0] = constants.MetaSig.Bytes()
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supports, err := g.getSupportsInterface(a, resolverAddr, blockNumber, args)
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if err != nil {
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return "", fmt.Errorf("call to getSupportsInterface failed: %v", err)
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}
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if !supports {
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return "", fmt.Errorf("contract does not support interface")
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}
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abiStr := `[`
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args[0] = constants.AddrChangeSig.Bytes()
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supports, err = g.getSupportsInterface(a, resolverAddr, blockNumber, args)
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if err == nil && supports {
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abiStr += constants.AddrChangeInterface + ","
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}
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args[0] = constants.NameChangeSig.Bytes()
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supports, err = g.getSupportsInterface(a, resolverAddr, blockNumber, args)
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if err == nil && supports {
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abiStr += constants.NameChangeInterface + ","
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}
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args[0] = constants.ContentChangeSig.Bytes()
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supports, err = g.getSupportsInterface(a, resolverAddr, blockNumber, args)
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if err == nil && supports {
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abiStr += constants.ContentChangeInterface + ","
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}
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args[0] = constants.AbiChangeSig.Bytes()
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supports, err = g.getSupportsInterface(a, resolverAddr, blockNumber, args)
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if err == nil && supports {
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abiStr += constants.AbiChangeInterface + ","
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}
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args[0] = constants.PubkeyChangeSig.Bytes()
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supports, err = g.getSupportsInterface(a, resolverAddr, blockNumber, args)
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if err == nil && supports {
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abiStr += constants.PubkeyChangeInterface + ","
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}
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args[0] = constants.ContentHashChangeSig.Bytes()
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supports, err = g.getSupportsInterface(a, resolverAddr, blockNumber, args)
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if err == nil && supports {
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abiStr += constants.ContenthashChangeInterface + ","
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}
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args[0] = constants.MultihashChangeSig.Bytes()
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supports, err = g.getSupportsInterface(a, resolverAddr, blockNumber, args)
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if err == nil && supports {
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abiStr += constants.MultihashChangeInterface + ","
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}
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args[0] = constants.TextChangeSig.Bytes()
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supports, err = g.getSupportsInterface(a, resolverAddr, blockNumber, args)
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if err == nil && supports {
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abiStr += constants.TextChangeInterface + ","
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}
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abiStr = abiStr[:len(abiStr)-1] + `]`
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return abiStr, nil
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}
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// Use this method to check whether or not a contract supports a given method/event interface
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func (g *interfaceGetter) getSupportsInterface(contractAbi, contractAddress string, blockNumber int64, methodArgs []interface{}) (bool, error) {
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return g.Fetcher.FetchBool("supportsInterface", contractAbi, contractAddress, blockNumber, methodArgs)
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}
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// GetBlockChain is a method to retrieve the Getter's blockchain
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func (g *interfaceGetter) GetBlockChain() core.BlockChain {
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return g.Fetcher.BlockChain
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}
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