mirror of https://github.com/poanetwork/quorum.git
76 lines
2.7 KiB
Go
76 lines
2.7 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 istanbul
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import (
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"math/big"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/event"
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)
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// Backend provides application specific functions for Istanbul core
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type Backend interface {
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// Address returns the owner's address
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Address() common.Address
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// Validators returns the validator set
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Validators(proposal Proposal) ValidatorSet
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// EventMux returns the event mux in backend
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EventMux() *event.TypeMux
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// Broadcast sends a message to all validators (include self)
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Broadcast(valSet ValidatorSet, payload []byte) error
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// Gossip sends a message to all validators (exclude self)
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Gossip(valSet ValidatorSet, payload []byte) error
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// Commit delivers an approved proposal to backend.
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// The delivered proposal will be put into blockchain.
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Commit(proposal Proposal, seals [][]byte) error
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// Verify verifies the proposal. If a consensus.ErrFutureBlock error is returned,
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// the time difference of the proposal and current time is also returned.
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Verify(Proposal) (time.Duration, error)
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// Sign signs input data with the backend's private key
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Sign([]byte) ([]byte, error)
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// CheckSignature verifies the signature by checking if it's signed by
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// the given validator
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CheckSignature(data []byte, addr common.Address, sig []byte) error
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// LastProposal retrieves latest committed proposal and the address of proposer
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LastProposal() (Proposal, common.Address)
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// HasPropsal checks if the combination of the given hash and height matches any existing blocks
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HasPropsal(hash common.Hash, number *big.Int) bool
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// GetProposer returns the proposer of the given block height
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GetProposer(number uint64) common.Address
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// ParentValidators returns the validator set of the given proposal's parent block
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ParentValidators(proposal Proposal) ValidatorSet
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// HasBadBlock returns whether the block with the hash is a bad block
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HasBadProposal(hash common.Hash) bool
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Close() error
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}
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