/
common.go
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/
common.go
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// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package conncheck
import (
"encoding/json"
"fmt"
"time"
)
// Msg represents a message sent between two nodes.
type Msg struct {
ClusterID string `json:"clusterID"`
MsgType MsgTypes `json:"msgType"`
TimeStamp time.Time `json:"timeStamp"`
}
func (msg Msg) String() string {
return fmt.Sprintf("ClusterID: %s, MsgType: %s, Timestamp: %d:%d:%d.%d",
msg.ClusterID,
msg.MsgType,
msg.TimeStamp.Hour(), msg.TimeStamp.Minute(), msg.TimeStamp.Second(), msg.TimeStamp.Nanosecond())
}
// MsgTypes represents the type of a message.
type MsgTypes string
const (
// PING is the type of a ping message.
PING MsgTypes = "PING"
// PONG is the type of a pong message.
PONG MsgTypes = "PONG"
)
// UpdateFunc is a callback function.
type UpdateFunc func(connected bool) error
// UnmarshalMsg unmarshals a message.
func UnmarshalMsg(bytes []byte) (*Msg, error) {
msg := &Msg{}
err := json.Unmarshal(bytes, msg)
if err != nil {
return nil, err
}
return msg, nil
}
// MarshalMsg marshals a message.
func MarshalMsg(msg Msg) ([]byte, error) {
b, err := json.Marshal(msg)
if err != nil {
return nil, err
}
return b, nil
}