forked from cerc-io/ipld-eth-server
85 lines
2.5 KiB
Go
85 lines
2.5 KiB
Go
package geth
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import (
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"errors"
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"fmt"
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"path/filepath"
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"sort"
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"context"
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"math/big"
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"github.com/8thlight/vulcanizedb/pkg/config"
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"github.com/8thlight/vulcanizedb/pkg/core"
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"github.com/ethereum/go-ethereum"
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"github.com/ethereum/go-ethereum/accounts/abi"
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"github.com/ethereum/go-ethereum/common"
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)
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var (
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ErrInvalidStateAttribute = errors.New("invalid state attribute")
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)
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func (blockchain *GethBlockchain) GetContract(contractHash string) (core.Contract, error) {
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attributes, err := blockchain.getContractAttributes(contractHash)
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if err != nil {
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return core.Contract{}, err
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} else {
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contract := core.Contract{
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Attributes: attributes,
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Hash: contractHash,
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}
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return contract, nil
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}
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}
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func (blockchain *GethBlockchain) getParseAbi(contract core.Contract) (abi.ABI, error) {
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abiFilePath := filepath.Join(config.ProjectRoot(), "contracts", "public", fmt.Sprintf("%s.json", contract.Hash))
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parsed, err := ParseAbiFile(abiFilePath)
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if err != nil {
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return abi.ABI{}, err
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}
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return parsed, nil
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}
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func (blockchain *GethBlockchain) GetAttribute(contract core.Contract, attributeName string, blockNumber *big.Int) (interface{}, error) {
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parsed, err := blockchain.getParseAbi(contract)
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var result interface{}
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if err != nil {
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return result, err
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}
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input, err := parsed.Pack(attributeName)
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if err != nil {
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return nil, err
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}
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output, err := callContract(contract, input, err, blockchain, blockNumber)
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if err != nil {
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return nil, err
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}
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err = parsed.Unpack(&result, attributeName, output)
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if err != nil {
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return nil, ErrInvalidStateAttribute
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}
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return result, nil
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}
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func callContract(contract core.Contract, input []byte, err error, blockchain *GethBlockchain, blockNumber *big.Int) ([]byte, error) {
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to := common.HexToAddress(contract.Hash)
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msg := ethereum.CallMsg{To: &to, Data: input}
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return blockchain.client.CallContract(context.Background(), msg, blockNumber)
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}
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func (blockchain *GethBlockchain) getContractAttributes(contractHash string) (core.ContractAttributes, error) {
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abiFilePath := filepath.Join(config.ProjectRoot(), "contracts", "public", fmt.Sprintf("%s.json", contractHash))
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parsed, _ := ParseAbiFile(abiFilePath)
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var contractAttributes core.ContractAttributes
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for _, abiElement := range parsed.Methods {
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if (len(abiElement.Outputs) > 0) && (len(abiElement.Inputs) == 0) && abiElement.Const {
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attributeType := abiElement.Outputs[0].Type.String()
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contractAttributes = append(contractAttributes, core.ContractAttribute{abiElement.Name, attributeType})
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}
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}
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sort.Sort(contractAttributes)
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return contractAttributes, nil
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}
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