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82 lines
2.9 KiB
82 lines
2.9 KiB
package node
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import (
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"math/big"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/harmony-one/harmony/core/types"
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)
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//constants related to staking
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//The first four bytes of the call data for a function call specifies the function to be called.
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//It is the first (left, high-order in big-endian) four bytes of the Keccak-256 (SHA-3)
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//Refer: https://solidity.readthedocs.io/en/develop/abi-spec.html
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const (
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depositFuncSignature = "0xd0e30db0"
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withdrawFuncSignature = "0x2e1a7d4d"
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funcSingatureBytes = 4
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)
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// UpdateStakingList updates the stakes of every node.
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// TODO: read directly from smart contract, or at least check the receipt also for incompleted transaction.
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func (node *Node) UpdateStakingList(block *types.Block) error {
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signerType := types.HomesteadSigner{}
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txns := block.Transactions()
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for i := range txns {
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txn := txns[i]
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toAddress := txn.To()
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if toAddress != nil && *toAddress != node.StakingContractAddress { //Not a address aimed at the staking contract.
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continue
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}
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currentSender, _ := types.Sender(signerType, txn)
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_, isPresent := node.CurrentStakes[currentSender]
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data := txn.Data()
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switch funcSignature := decodeFuncSign(data); funcSignature {
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case depositFuncSignature: //deposit, currently: 0xd0e30db0
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amount := txn.Value()
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value := amount.Int64()
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if isPresent {
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//This means the node has increased its stake.
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node.CurrentStakes[currentSender] += value
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} else {
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//This means its a new node that is staking the first time.
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node.CurrentStakes[currentSender] = value
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}
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case withdrawFuncSignature: //withdraw, currently: 0x2e1a7d4d
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value := decodeStakeCall(data)
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if isPresent {
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if node.CurrentStakes[currentSender] > value {
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node.CurrentStakes[currentSender] -= value
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} else if node.CurrentStakes[currentSender] == value {
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delete(node.CurrentStakes, currentSender)
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} else {
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continue //Overdraft protection.
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}
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} else {
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continue //no-op: a node that is not staked cannot withdraw stake.
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}
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default:
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continue //no-op if its not deposit or withdaw
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}
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}
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return nil
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}
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//The first four bytes of the call data for a function call specifies the function to be called.
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//It is the first (left, high-order in big-endian) four bytes of the Keccak-256 (SHA-3)
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//Refer: https://solidity.readthedocs.io/en/develop/abi-spec.html
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func decodeStakeCall(getData []byte) int64 {
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value := new(big.Int)
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value.SetBytes(getData[funcSingatureBytes:]) //Escape the method call.
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return value.Int64()
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}
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//The first four bytes of the call data for a function call specifies the function to be called.
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//It is the first (left, high-order in big-endian) four bytes of the Keccak-256 (SHA-3)
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//Refer: https://solidity.readthedocs.io/en/develop/abi-spec.html
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//gets the function signature from data.
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func decodeFuncSign(data []byte) string {
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funcSign := hexutil.Encode(data[:funcSingatureBytes]) //The function signature is first 4 bytes of data in ethereum
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return funcSign
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}
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