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request.go
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request.go
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// Modifications Copyright 2018 The klaytn Authors
// 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/>.
//
// This file is derived from quorum/consensus/istanbul/core/request.go (2018/06/04).
// Modified and improved for the klaytn development.
package core
import (
"github.com/klaytn/klaytn/consensus/istanbul"
)
func (c *core) handleRequest(request *istanbul.Request) error {
logger := c.logger.NewWith("state", c.state, "seq", c.current.sequence)
if err := c.checkRequestMsg(request); err != nil {
if err == 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 == 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 errInvalidMessage
}
if c := c.current.sequence.Cmp(request.Proposal.Number()); c > 0 {
return errOldMessage
} else if c < 0 {
return errFutureMessage
} else {
return nil
}
}
func (c *core) storeRequestMsg(request *istanbul.Request) {
logger := c.logger.NewWith("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, -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 == 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,
})
}
}