cerc-io/ipld-eth-server
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Contract hist (#84)

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Add ability to query contract historical state
This commit is contained in:
Matt K
2017-12-04 12:54:33 -06:00
committed by ericmeyer
parent 7501fe70a7
commit 71de8e970d
8 changed files with 143 additions and 44 deletions
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pkg/geth/contract.go
+31 -14
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@@ -7,9 +7,13 @@ import (
"sort"
"context"
"math/big"
"github.com/8thlight/vulcanizedb/pkg/config"
"github.com/8thlight/vulcanizedb/pkg/core"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/common"
)
@@ -30,18 +34,40 @@ func (blockchain *GethBlockchain) GetContract(contractHash string) (core.Contrac
}
}
func (blockchain *GethBlockchain) GetAttribute(contract core.Contract, attributeName string) (interface{}, error) {
boundContract, err := bindContract(common.HexToAddress(contract.Hash), blockchain.client, blockchain.client)
func (blockchain *GethBlockchain) getParseAbi(contract core.Contract) (abi.ABI, error) {
abiFilePath := filepath.Join(config.ProjectRoot(), "contracts", "public", fmt.Sprintf("%s.json", contract.Hash))
parsed, err := ParseAbiFile(abiFilePath)
if err != nil {
return abi.ABI{}, err
}
return parsed, nil
}
func (blockchain *GethBlockchain) GetAttribute(contract core.Contract, attributeName string, blockNumber *big.Int) (interface{}, error) {
parsed, err := blockchain.getParseAbi(contract)
var result interface{}
if err != nil {
return result, err
}
input, err := parsed.Pack(attributeName)
if err != nil {
return nil, err
}
var result interface{}
err = boundContract.Call(&bind.CallOpts{}, &result, attributeName)
output, err := callContract(contract, input, err, blockchain, blockNumber)
if err != nil {
return nil, err
}
err = parsed.Unpack(&result, attributeName, output)
if err != nil {
return nil, ErrInvalidStateAttribute
}
return result, nil
}
func callContract(contract core.Contract, input []byte, err error, blockchain *GethBlockchain, blockNumber *big.Int) ([]byte, error) {
to := common.HexToAddress(contract.Hash)
msg := ethereum.CallMsg{To: &to, Data: input}
return blockchain.client.CallContract(context.Background(), msg, blockNumber)
}
func (blockchain *GethBlockchain) getContractAttributes(contractHash string) (core.ContractAttributes, error) {
abiFilePath := filepath.Join(config.ProjectRoot(), "contracts", "public", fmt.Sprintf("%s.json", contractHash))
@@ -56,12 +82,3 @@ func (blockchain *GethBlockchain) getContractAttributes(contractHash string) (co
sort.Sort(contractAttributes)
return contractAttributes, nil
}
func bindContract(address common.Address, caller bind.ContractCaller, transactor bind.ContractTransactor) (bind.BoundContract, error) {
abiFilePath := filepath.Join(config.ProjectRoot(), "contracts", "public", fmt.Sprintf("%s.json", address.Hex()))
parsed, err := ParseAbiFile(abiFilePath)
if err != nil {
return bind.BoundContract{}, err
}
return *bind.NewBoundContract(address, parsed, caller, transactor), nil
}