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// Copyright 2015 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 dex

import (
    "github.com/tangerine-network/go-tangerine/metrics"
    "github.com/tangerine-network/go-tangerine/p2p"
)

var (
    propBlockConfirmLatency                = metrics.NewRegisteredGauge("dex/prop/blockconfirm/latency", nil)
    propTxnInPacketsMeter                  = metrics.NewRegisteredMeter("dex/prop/txns/in/packets", nil)
    propTxnInTrafficMeter                  = metrics.NewRegisteredMeter("dex/prop/txns/in/traffic", nil)
    propTxnOutPacketsMeter                 = metrics.NewRegisteredMeter("dex/prop/txns/out/packets", nil)
    propTxnOutTrafficMeter                 = metrics.NewRegisteredMeter("dex/prop/txns/out/traffic", nil)
    propHashInPacketsMeter                 = metrics.NewRegisteredMeter("dex/prop/hashes/in/packets", nil)
    propHashInTrafficMeter                 = metrics.NewRegisteredMeter("dex/prop/hashes/in/traffic", nil)
    propHashOutPacketsMeter                = metrics.NewRegisteredMeter("dex/prop/hashes/out/packets", nil)
    propHashOutTrafficMeter                = metrics.NewRegisteredMeter("dex/prop/hashes/out/traffic", nil)
    propBlockInPacketsMeter                = metrics.NewRegisteredMeter("dex/prop/blocks/in/packets", nil)
    propBlockInTrafficMeter                = metrics.NewRegisteredMeter("dex/prop/blocks/in/traffic", nil)
    propBlockOutPacketsMeter               = metrics.NewRegisteredMeter("dex/prop/blocks/out/packets", nil)
    propBlockOutTrafficMeter               = metrics.NewRegisteredMeter("dex/prop/blocks/out/traffic", nil)
    propCoreBlockInPacketsMeter            = metrics.NewRegisteredMeter("dex/prop/coreblocks/in/packets", nil)
    propCoreBlockInTrafficMeter            = metrics.NewRegisteredMeter("dex/prop/coreblocks/in/traffic", nil)
    propCoreBlockOutPacketsMeter           = metrics.NewRegisteredMeter("dex/prop/coreblocks/out/packets", nil)
    propCoreBlockOutTrafficMeter           = metrics.NewRegisteredMeter("dex/prop/coreblocks/out/traffic", nil)
    propVoteInPacketsMeter                 = metrics.NewRegisteredMeter("dex/prop/votes/in/packets", nil)
    propVoteInTrafficMeter                 = metrics.NewRegisteredMeter("dex/prop/votes/in/traffic", nil)
    propVoteOutPacketsMeter                = metrics.NewRegisteredMeter("dex/prop/votes/out/packets", nil)
    propVoteOutTrafficMeter                = metrics.NewRegisteredMeter("dex/prop/votes/out/traffic", nil)
    propAgreementInPacketsMeter            = metrics.NewRegisteredMeter("dex/prop/agreement/in/packets", nil)
    propAgreementInTrafficMeter            = metrics.NewRegisteredMeter("dex/prop/agreement/in/traffic", nil)
    propAgreementOutPacketsMeter           = metrics.NewRegisteredMeter("dex/prop/agreement/out/packets", nil)
    propAgreementOutTrafficMeter           = metrics.NewRegisteredMeter("dex/prop/agreement/out/traffic", nil)
    propDKGPartialSignatureInPacketsMeter  = metrics.NewRegisteredMeter("dex/prop/dkgpartialsignatures/in/packets", nil)
    propDKGPartialSignatureInTrafficMeter  = metrics.NewRegisteredMeter("dex/prop/dkgpartialsignatures/in/traffic", nil)
    propDKGPartialSignatureOutPacketsMeter = metrics.NewRegisteredMeter("dex/prop/dkgpartialsignatures/out/packets", nil)
    propDKGPartialSignatureOutTrafficMeter = metrics.NewRegisteredMeter("dex/prop/dkgpartialsignatures/out/traffic", nil)
    reqHeaderInPacketsMeter                = metrics.NewRegisteredMeter("dex/req/headers/in/packets", nil)
    reqHeaderInTrafficMeter                = metrics.NewRegisteredMeter("dex/req/headers/in/traffic", nil)
    reqHeaderOutPacketsMeter               = metrics.NewRegisteredMeter("dex/req/headers/out/packets", nil)
    reqHeaderOutTrafficMeter               = metrics.NewRegisteredMeter("dex/req/headers/out/traffic", nil)
    reqBodyInPacketsMeter                  = metrics.NewRegisteredMeter("dex/req/bodies/in/packets", nil)
    reqBodyInTrafficMeter                  = metrics.NewRegisteredMeter("dex/req/bodies/in/traffic", nil)
    reqBodyOutPacketsMeter                 = metrics.NewRegisteredMeter("dex/req/bodies/out/packets", nil)
    reqBodyOutTrafficMeter                 = metrics.NewRegisteredMeter("dex/req/bodies/out/traffic", nil)
    reqStateInPacketsMeter                 = metrics.NewRegisteredMeter("dex/req/states/in/packets", nil)
    reqStateInTrafficMeter                 = metrics.NewRegisteredMeter("dex/req/states/in/traffic", nil)
    reqStateOutPacketsMeter                = metrics.NewRegisteredMeter("dex/req/states/out/packets", nil)
    reqStateOutTrafficMeter                = metrics.NewRegisteredMeter("dex/req/states/out/traffic", nil)
    reqReceiptInPacketsMeter               = metrics.NewRegisteredMeter("dex/req/receipts/in/packets", nil)
    reqReceiptInTrafficMeter               = metrics.NewRegisteredMeter("dex/req/receipts/in/traffic", nil)
    reqReceiptOutPacketsMeter              = metrics.NewRegisteredMeter("dex/req/receipts/out/packets", nil)
    reqReceiptOutTrafficMeter              = metrics.NewRegisteredMeter("dex/req/receipts/out/traffic", nil)
    reqCoreBlockInPacketsMeter             = metrics.NewRegisteredMeter("dex/req/coreblocks/in/packets", nil)
    reqCoreBlockInTrafficMeter             = metrics.NewRegisteredMeter("dex/req/coreblocks/in/traffic", nil)
    reqCoreBlockOutPacketsMeter            = metrics.NewRegisteredMeter("dex/req/coreblocks/out/packets", nil)
    reqCoreBlockOutTrafficMeter            = metrics.NewRegisteredMeter("dex/req/coreblocks/out/traffic", nil)
    reqVoteInPacketsMeter                  = metrics.NewRegisteredMeter("dex/req/votes/in/packets", nil)
    reqVoteInTrafficMeter                  = metrics.NewRegisteredMeter("dex/req/votes/in/traffic", nil)
    reqVoteOutPacketsMeter                 = metrics.NewRegisteredMeter("dex/req/votes/out/packets", nil)
    reqVoteOutTrafficMeter                 = metrics.NewRegisteredMeter("dex/req/votes/out/traffic", nil)
    miscInPacketsMeter                     = metrics.NewRegisteredMeter("dex/misc/in/packets", nil)
    miscInTrafficMeter                     = metrics.NewRegisteredMeter("dex/misc/in/traffic", nil)
    miscOutPacketsMeter                    = metrics.NewRegisteredMeter("dex/misc/out/packets", nil)
    miscOutTrafficMeter                    = metrics.NewRegisteredMeter("dex/misc/out/traffic", nil)
)

// meteredMsgReadWriter is a wrapper around a p2p.MsgReadWriter, capable of
// accumulating the above defined metrics based on the data stream contents.
type meteredMsgReadWriter struct {
    p2p.MsgReadWriter     // Wrapped message stream to meter
    version           int // Protocol version to select correct meters
}

// newMeteredMsgWriter wraps a p2p MsgReadWriter with metering support. If the
// metrics system is disabled, this function returns the original object.
func newMeteredMsgWriter(rw p2p.MsgReadWriter) p2p.MsgReadWriter {
    if !metrics.Enabled {
        return rw
    }
    return &meteredMsgReadWriter{MsgReadWriter: rw}
}

// Init sets the protocol version used by the stream to know which meters to
// increment in case of overlapping message ids between protocol versions.
func (rw *meteredMsgReadWriter) Init(version int) {
    rw.version = version
}

func (rw *meteredMsgReadWriter) ReadMsg() (p2p.Msg, error) {
    // Read the message and short circuit in case of an error
    msg, err := rw.MsgReadWriter.ReadMsg()
    if err != nil {
        return msg, err
    }
    // Account for the data traffic
    packets, traffic := miscInPacketsMeter, miscInTrafficMeter
    switch {
    case msg.Code == BlockHeadersMsg:
        packets, traffic = reqHeaderInPacketsMeter, reqHeaderInTrafficMeter
    case msg.Code == BlockBodiesMsg:
        packets, traffic = reqBodyInPacketsMeter, reqBodyInTrafficMeter

    case msg.Code == NodeDataMsg:
        packets, traffic = reqStateInPacketsMeter, reqStateInTrafficMeter
    case msg.Code == ReceiptsMsg:
        packets, traffic = reqReceiptInPacketsMeter, reqReceiptInTrafficMeter

    case msg.Code == NewBlockHashesMsg:
        packets, traffic = propHashInPacketsMeter, propHashInTrafficMeter
    case msg.Code == NewBlockMsg:
        packets, traffic = propBlockInPacketsMeter, propBlockInTrafficMeter
    case msg.Code == TxMsg:
        packets, traffic = propTxnInPacketsMeter, propTxnInTrafficMeter

    case msg.Code == CoreBlockMsg:
        packets, traffic = propCoreBlockInPacketsMeter, propCoreBlockInTrafficMeter
    case msg.Code == VoteMsg:
        packets, traffic = propVoteInPacketsMeter, propVoteInTrafficMeter

    case msg.Code == PullBlocksMsg:
        packets, traffic = reqCoreBlockInPacketsMeter, reqCoreBlockInTrafficMeter
    case msg.Code == PullVotesMsg:
        packets, traffic = reqVoteInPacketsMeter, reqVoteInTrafficMeter

    case msg.Code == AgreementMsg:
        packets, traffic = propAgreementInPacketsMeter, propAgreementInTrafficMeter
    case msg.Code == DKGPartialSignatureMsg:
        packets, traffic = propDKGPartialSignatureInPacketsMeter, propDKGPartialSignatureInTrafficMeter
    }
    packets.Mark(1)
    traffic.Mark(int64(msg.Size))

    return msg, err
}

func (rw *meteredMsgReadWriter) WriteMsg(msg p2p.Msg) error {
    // Account for the data traffic
    packets, traffic := miscOutPacketsMeter, miscOutTrafficMeter
    switch {
    case msg.Code == BlockHeadersMsg:
        packets, traffic = reqHeaderOutPacketsMeter, reqHeaderOutTrafficMeter
    case msg.Code == BlockBodiesMsg:
        packets, traffic = reqBodyOutPacketsMeter, reqBodyOutTrafficMeter

    case msg.Code == NodeDataMsg:
        packets, traffic = reqStateOutPacketsMeter, reqStateOutTrafficMeter
    case msg.Code == ReceiptsMsg:
        packets, traffic = reqReceiptOutPacketsMeter, reqReceiptOutTrafficMeter

    case msg.Code == NewBlockHashesMsg:
        packets, traffic = propHashOutPacketsMeter, propHashOutTrafficMeter
    case msg.Code == NewBlockMsg:
        packets, traffic = propBlockOutPacketsMeter, propBlockOutTrafficMeter
    case msg.Code == TxMsg:
        packets, traffic = propTxnOutPacketsMeter, propTxnOutTrafficMeter

    case msg.Code == CoreBlockMsg:
        packets, traffic = propCoreBlockOutPacketsMeter, propCoreBlockOutTrafficMeter
    case msg.Code == VoteMsg:
        packets, traffic = propVoteOutPacketsMeter, propVoteOutTrafficMeter

    case msg.Code == PullBlocksMsg:
        packets, traffic = reqCoreBlockOutPacketsMeter, reqCoreBlockOutTrafficMeter
    case msg.Code == PullVotesMsg:
        packets, traffic = reqVoteOutPacketsMeter, reqVoteOutTrafficMeter

    case msg.Code == AgreementMsg:
        packets, traffic = propAgreementOutPacketsMeter, propAgreementOutTrafficMeter
    case msg.Code == DKGPartialSignatureMsg:
        packets, traffic = propDKGPartialSignatureOutPacketsMeter, propDKGPartialSignatureOutTrafficMeter
    }
    packets.Mark(1)
    traffic.Mark(int64(msg.Size))

    // Send the packet to the p2p layer
    return rw.MsgReadWriter.WriteMsg(msg)
}