path: root/simulation/marshaller.go

// Copyright 2018 The dexon-consensus Authors
// This file is part of the dexon-consensus library.
//
// The dexon-consensus 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 dexon-consensus 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 dexon-consensus library. If not, see
// <http://www.gnu.org/licenses/>.

package simulation

import (
    "encoding/json"
    "fmt"
)

// jsonMarshaller implements test.Marshaller to marshal simulation related
// messages.
type jsonMarshaller struct{}

// Unmarshal implements Unmarshal method of test.Marshaller interface.
func (m *jsonMarshaller) Unmarshal(
    msgType string, payload []byte) (msg interface{}, err error) {
    switch msgType {
    case "server-notif":
        var notif serverNotification
        if err = json.Unmarshal(payload, &notif); err != nil {
            break
        }
        msg = notif
    case "blocklist":
        var blocks BlockList
        if err = json.Unmarshal(payload, &blocks); err != nil {
            break
        }
        msg = &blocks
    case "message":
        var m message
        if err = json.Unmarshal(payload, &m); err != nil {
            break
        }
        msg = &m
    default:
        err = fmt.Errorf("unrecognized message type: %v", msgType)
    }
    if err != nil {
        return
    }
    return
}

// Marshal implements Marshal method of test.Marshaller interface.
func (m *jsonMarshaller) Marshal(msg interface{}) (
    msgType string, payload []byte, err error) {
    switch msg.(type) {
    case serverNotification:
        msgType = "server-notif"
    case *BlockList:
        msgType = "blocklist"
    case *message:
        msgType = "message"
    default:
        err = fmt.Errorf("unknwon message type: %v", msg)
    }
    if err != nil {
        return
    }
    payload, err = json.Marshal(msg)
    return
}