aergoio/aergo

/*
 * @file
 * @copyright defined in aergo/LICENSE.txt
 */

package v030

import (
    "bytes"
    "context"
    "fmt"
    "io"

    "github.com/aergoio/aergo-lib/log"
    "github.com/aergoio/aergo/v2/internal/enc/base58"
    "github.com/aergoio/aergo/v2/internal/network"
    "github.com/aergoio/aergo/v2/p2p/p2pcommon"
    "github.com/aergoio/aergo/v2/p2p/p2putil"
    "github.com/aergoio/aergo/v2/types"
)

// V033Handshaker exchange status data over protocol version .0.3.1
// it
type V033Handshaker struct {
    V032Handshaker
    vm p2pcommon.VersionedManager
}

var _ p2pcommon.VersionedHandshaker = (*V033Handshaker)(nil)

func (h *V033Handshaker) GetMsgRW() p2pcommon.MsgReadWriter {
    return h.msgRW
}

func NewV033VersionedHS(pm p2pcommon.PeerManager, actor p2pcommon.ActorService, log *log.Logger, vm p2pcommon.VersionedManager, peerID types.PeerID, rwc io.ReadWriteCloser, genesis []byte) *V033Handshaker {
    v032 := NewV032VersionedHS(pm, actor, log, vm.GetChainID(0), peerID, rwc, genesis)
    h := &V033Handshaker{V032Handshaker: *v032, vm: vm}

    return h
}

func (h *V033Handshaker) checkRemoteStatus(remotePeerStatus *types.Status) error {
    // v030 checking
    // check if chainID is same or not
    remoteChainID := types.NewChainID()
    err := remoteChainID.Read(remotePeerStatus.ChainID)
    if err != nil {
        h.sendGoAway("wrong status")
        return err
    }
    localID := h.vm.GetChainID(remotePeerStatus.BestHeight)
    if !localID.Equals(remoteChainID) {
        h.sendGoAway("different chainID")
        return fmt.Errorf("different chainID : local is %s, remote is %s at bloco no %d", p2putil.PrintChainID(localID), p2putil.PrintChainID(remoteChainID), remotePeerStatus.BestHeight)
    }

    // handshake v0.3.x don't check format of block hash
    h.remoteHash, _ = types.ParseToBlockID(remotePeerStatus.BestBlockHash)
    h.remoteNo = remotePeerStatus.BestHeight

    peerAddress := remotePeerStatus.Sender
    if peerAddress == nil || network.CheckAddressType(peerAddress.Address) == network.AddressTypeError {
        h.sendGoAway("invalid peer address")
        return fmt.Errorf("invalid peer address : %s", peerAddress)
    }

    rMeta := p2pcommon.NewMetaFromStatus(remotePeerStatus)
    if rMeta.ID != h.peerID {
        h.logger.Debug().Str("received_peer_id", rMeta.ID.Pretty()).Stringer(p2putil.LogPeerID, types.LogPeerShort(h.peerID)).Msg("Inconsistent peerID")
        h.sendGoAway("Inconsistent peerID")
        return fmt.Errorf("inconsistent peerID")
    }
    h.remoteMeta = rMeta

    // check if genesis hashes are identical
    genHash := h.localGenesisHash
    if !bytes.Equal(genHash, remotePeerStatus.Genesis) {
        h.sendGoAway("different genesis block")
        return fmt.Errorf("different genesis block local: %v , remote %v", base58.Encode(genHash), base58.Encode(remotePeerStatus.Genesis))
    }

    return nil
}

func (h *V033Handshaker) DoForOutbound(ctx context.Context) (*p2pcommon.HandshakeResult, error) {
    h.logger.Debug().Stringer(p2putil.LogPeerID, types.LogPeerShort(h.peerID)).Msg("Starting versioned handshake for outbound peer connection")

    // find my best block
    bestBlock, err := h.actor.GetChainAccessor().GetBestBlock()
    if err != nil {
        return nil, err
    }
    localID := h.vm.GetChainID(bestBlock.Header.BlockNo)

    // outbound: send, receive and check
    localStatus, err := createLocalStatus(h.pm, localID, bestBlock, h.localGenesisHash)
    if err != nil {
        h.logger.Warn().Err(err).Msg("Failed to create status message.")
        h.sendGoAway("internal error")
        return nil, err
    }
    err = h.sendLocalStatus(ctx, localStatus)
    if err != nil {
        return nil, err
    }

    remotePeerStatus, err := h.receiveRemoteStatus(ctx)
    if err != nil {
        return nil, err
    }

    if err = h.checkRemoteStatus(remotePeerStatus); err != nil {
        return nil, err
    } else {
        hsResult := &p2pcommon.HandshakeResult{Meta: h.remoteMeta, BestBlockHash: h.remoteHash, BestBlockNo: h.remoteNo, MsgRW: h.msgRW, Hidden: remotePeerStatus.NoExpose}
        return hsResult, nil
    }

}

func (h *V033Handshaker) DoForInbound(ctx context.Context) (*p2pcommon.HandshakeResult, error) {
    h.logger.Debug().Stringer(p2putil.LogPeerID, types.LogPeerShort(h.peerID)).Msg("Starting versioned handshake for inbound peer connection")

    // inbound: receive, check and send
    remotePeerStatus, err := h.receiveRemoteStatus(ctx)
    if err != nil {
        return nil, err
    }
    if err = h.checkRemoteStatus(remotePeerStatus); err != nil {
        return nil, err
    }
    bestBlock, err := h.actor.GetChainAccessor().GetBestBlock()
    if err != nil {
        return nil, err
    }
    localID := h.vm.GetChainID(bestBlock.Header.BlockNo)

    // send my status message as response
    localStatus, err := createLocalStatus(h.pm, localID, bestBlock, h.localGenesisHash)
    if err != nil {
        h.logger.Warn().Err(err).Msg("Failed to create status message.")
        h.sendGoAway("internal error")
        return nil, err
    }
    err = h.sendLocalStatus(ctx, localStatus)
    if err != nil {
        return nil, err
    }
    hsResult := &p2pcommon.HandshakeResult{Meta: h.remoteMeta, BestBlockHash: h.remoteHash, BestBlockNo: h.remoteNo, MsgRW: h.msgRW, Hidden: remotePeerStatus.NoExpose}
    return hsResult, nil
}