mirror of https://github.com/poanetwork/quorum.git
108 lines
3.1 KiB
Go
108 lines
3.1 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 core
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import (
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"reflect"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/consensus/istanbul"
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)
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func (c *core) sendCommit() {
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sub := c.current.Subject()
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c.broadcastCommit(sub)
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}
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func (c *core) sendCommitForOldBlock(view *istanbul.View, digest common.Hash) {
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sub := &istanbul.Subject{
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View: view,
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Digest: digest,
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}
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c.broadcastCommit(sub)
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}
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func (c *core) broadcastCommit(sub *istanbul.Subject) {
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logger := c.logger.New("state", c.state)
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encodedSubject, err := Encode(sub)
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if err != nil {
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logger.Error("Failed to encode", "subject", sub)
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return
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}
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c.broadcast(&message{
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Code: msgCommit,
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Msg: encodedSubject,
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})
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}
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func (c *core) handleCommit(msg *message, src istanbul.Validator) error {
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// Decode COMMIT message
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var commit *istanbul.Subject
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err := msg.Decode(&commit)
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if err != nil {
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return errFailedDecodeCommit
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}
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if err := c.checkMessage(msgCommit, commit.View); err != nil {
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return err
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}
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if err := c.verifyCommit(commit, src); err != nil {
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return err
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}
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c.acceptCommit(msg, src)
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// Commit the proposal once we have enough COMMIT messages and we are not in the Committed state.
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//
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// If we already have a proposal, we may have chance to speed up the consensus process
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// by committing the proposal without PREPARE messages.
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if c.current.Commits.Size() >= c.QuorumSize() && c.state.Cmp(StateCommitted) < 0 {
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// Still need to call LockHash here since state can skip Prepared state and jump directly to the Committed state.
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c.current.LockHash()
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c.commit()
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}
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return nil
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}
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// verifyCommit verifies if the received COMMIT message is equivalent to our subject
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func (c *core) verifyCommit(commit *istanbul.Subject, src istanbul.Validator) error {
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logger := c.logger.New("from", src, "state", c.state)
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sub := c.current.Subject()
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if !reflect.DeepEqual(commit, sub) {
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logger.Warn("Inconsistent subjects between commit and proposal", "expected", sub, "got", commit)
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return errInconsistentSubject
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}
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return nil
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}
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func (c *core) acceptCommit(msg *message, src istanbul.Validator) error {
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logger := c.logger.New("from", src, "state", c.state)
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// Add the COMMIT message to current round state
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if err := c.current.Commits.Add(msg); err != nil {
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logger.Error("Failed to record commit message", "msg", msg, "err", err)
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return err
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}
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return nil
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}
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