neo-go/pkg/syncmgr/headermode.go

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package syncmgr
import (
"github.com/CityOfZion/neo-go/pkg/chain"
"github.com/CityOfZion/neo-go/pkg/wire/payload"
)
// headersModeOnHeaders is called when the sync manager is headers mode
// and receives a header.
func (s *Syncmgr) headersModeOnHeaders(peer SyncPeer, hdrs []*payload.BlockBase) error {
// If we are in Headers mode, then we just need to process the headers
// Note: For the un-optimised version, we move straight to blocksOnly mode
firstHash := hdrs[0].Hash
err := s.cfg.ProcessHeaders(hdrs)
if err == nil {
// Update syncmgr last header
s.headerHash = hdrs[len(hdrs)-1].Hash
s.syncmode = blockMode
return s.cfg.RequestBlock(firstHash)
}
// Check whether it is a validation error, or a database error
if _, ok := err.(*chain.ValidationError); ok {
// If we get a validation error we re-request the headers
// the method will automatically fetch from a different peer
// XXX: Add increment banScore for this peer
return s.cfg.FetchHeadersAgain(firstHash)
}
// This means it is a database error. We have no way to recover from this.
panic(err.Error())
}
// headersModeOnBlock is called when the sync manager is headers mode
// and receives a block.
func (s *Syncmgr) headersModeOnBlock(peer SyncPeer, block payload.Block) error {
// While in headers mode, ignore any blocks received
return nil
}