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- // Copyright 2017 The go-ethereum Authors
- // This file is part of the go-ethereum library.
- //
- // The go-ethereum library is free software: you can redistribute it and/or modify
- // it under the terms of the GNU Lesser General Public License as published by
- // the Free Software Foundation, either version 3 of the License, or
- // (at your option) any later version.
- //
- // The go-ethereum library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU Lesser General Public License for more details.
- //
- // You should have received a copy of the GNU Lesser General Public License
- // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
- package core
- import (
- "github.com/ethereum/go-ethereum/consensus/istanbul"
- istanbulcommon "github.com/ethereum/go-ethereum/consensus/istanbul/common"
- ibfttypes "github.com/ethereum/go-ethereum/consensus/istanbul/ibft/types"
- )
- func (c *core) handleRequest(request *istanbul.Request) error {
- logger := c.logger.New("state", c.state, "seq", c.current.sequence)
- if err := c.checkRequestMsg(request); err != nil {
- if err == istanbulcommon.ErrInvalidMessage {
- logger.Warn("invalid request")
- return err
- }
- logger.Warn("unexpected request", "err", err, "number", request.Proposal.Number(), "hash", request.Proposal.Hash())
- return err
- }
- logger.Trace("handleRequest", "number", request.Proposal.Number(), "hash", request.Proposal.Hash())
- c.current.pendingRequest = request
- if c.state == ibfttypes.StateAcceptRequest {
- c.sendPreprepare(request)
- }
- return nil
- }
- // check request state
- // return errInvalidMessage if the message is invalid
- // return errFutureMessage if the sequence of proposal is larger than current sequence
- // return errOldMessage if the sequence of proposal is smaller than current sequence
- func (c *core) checkRequestMsg(request *istanbul.Request) error {
- if request == nil || request.Proposal == nil {
- return istanbulcommon.ErrInvalidMessage
- }
- if c := c.current.sequence.Cmp(request.Proposal.Number()); c > 0 {
- return istanbulcommon.ErrOldMessage
- } else if c < 0 {
- return istanbulcommon.ErrFutureMessage
- } else {
- return nil
- }
- }
- func (c *core) storeRequestMsg(request *istanbul.Request) {
- logger := c.logger.New("state", c.state)
- logger.Trace("Store future request", "number", request.Proposal.Number(), "hash", request.Proposal.Hash())
- c.pendingRequestsMu.Lock()
- defer c.pendingRequestsMu.Unlock()
- c.pendingRequests.Push(request, float32(-request.Proposal.Number().Int64()))
- }
- func (c *core) processPendingRequests() {
- c.pendingRequestsMu.Lock()
- defer c.pendingRequestsMu.Unlock()
- for !(c.pendingRequests.Empty()) {
- m, prio := c.pendingRequests.Pop()
- r, ok := m.(*istanbul.Request)
- if !ok {
- c.logger.Warn("Malformed request, skip", "msg", m)
- continue
- }
- // Push back if it's a future message
- err := c.checkRequestMsg(r)
- if err != nil {
- if err == istanbulcommon.ErrFutureMessage {
- c.logger.Trace("Stop processing request", "number", r.Proposal.Number(), "hash", r.Proposal.Hash())
- c.pendingRequests.Push(m, prio)
- break
- }
- c.logger.Trace("Skip the pending request", "number", r.Proposal.Number(), "hash", r.Proposal.Hash(), "err", err)
- continue
- }
- c.logger.Trace("Post pending request", "number", r.Proposal.Number(), "hash", r.Proposal.Hash())
- go c.sendEvent(istanbul.RequestEvent{
- Proposal: r.Proposal,
- })
- }
- }
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