feeccdf4ec
This PR is a prototype implementation of plugable consensus engines and the Clique PoA protocol ethereum/EIPs#225
98 lines
3.3 KiB
Go
98 lines
3.3 KiB
Go
// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser 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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//
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// The go-ethereum library 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 Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package clique
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import (
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/consensus"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/rpc"
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)
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// API is a user facing RPC API to allow controlling the signer and voting
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// mechanisms of the proof-of-authority scheme.
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type API struct {
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chain consensus.ChainReader
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clique *Clique
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}
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// GetSnapshot retrieves the state snapshot at a given block.
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func (api *API) GetSnapshot(number *rpc.BlockNumber) (interface{}, error) {
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// Retrieve the requested block number (or current if none requested)
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var header *types.Header
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if number == nil || *number == rpc.LatestBlockNumber {
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header = api.chain.CurrentHeader()
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} else {
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header = api.chain.GetHeaderByNumber(uint64(number.Int64()))
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}
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// Ensure we have an actually valid block and return its snapshot
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if header == nil {
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return nil, errUnknownBlock
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}
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return api.clique.snapshot(api.chain, header.Number.Uint64(), header.Hash(), nil)
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}
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// GetSigners retrieves the list of authorized signers at the specified block.
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func (api *API) GetSigners(number *rpc.BlockNumber) ([]common.Address, error) {
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// Retrieve the requested block number (or current if none requested)
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var header *types.Header
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if number == nil || *number == rpc.LatestBlockNumber {
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header = api.chain.CurrentHeader()
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} else {
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header = api.chain.GetHeaderByNumber(uint64(number.Int64()))
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}
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// Ensure we have an actually valid block and return the signers from its snapshot
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if header == nil {
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return nil, errUnknownBlock
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}
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snap, err := api.clique.snapshot(api.chain, header.Number.Uint64(), header.Hash(), nil)
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if err != nil {
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return nil, err
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}
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return snap.signers(), nil
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}
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// Proposals returns the current proposals the node tries to uphold and vote on.
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func (api *API) Proposals() map[common.Address]bool {
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api.clique.lock.RLock()
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defer api.clique.lock.RUnlock()
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proposals := make(map[common.Address]bool)
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for address, auth := range api.clique.proposals {
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proposals[address] = auth
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}
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return proposals
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}
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// Propose injects a new authorization proposal that the signer will attempt to
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// push through.
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func (api *API) Propose(address common.Address, auth bool) {
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api.clique.lock.Lock()
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defer api.clique.lock.Unlock()
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api.clique.proposals[address] = auth
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}
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// Discard drops a currently running proposal, stopping the signer from casting
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// further votes (either for or against).
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func (api *API) Discard(address common.Address) {
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api.clique.lock.Lock()
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defer api.clique.lock.Unlock()
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delete(api.clique.proposals, address)
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}
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