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ping.go
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ping.go
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package ping
import (
"encoding/json"
"github.com/dayaftereh/discover/server/utils"
"github.com/dayaftereh/discover/server/api/connection"
"github.com/dayaftereh/discover/server/api/connection/dispatch/handler"
types "github.com/dayaftereh/discover/server/api/types/connection"
"github.com/pkg/errors"
)
type pingHandler struct {
backend Backend
}
func NewHandler(backend Backend) handler.Handler {
return &pingHandler{
backend: backend,
}
}
func (handler *pingHandler) MessageType() types.MessageType {
return types.Ping
}
func (handler *pingHandler) Handler() connection.Function {
return func(connection *connection.Connection, content string) error {
// get the receive time
receiveTime := utils.SystemMillis()
// convert to bytes
data := []byte(content)
// Unmarshal ping message
var ping types.PingMessage
err := json.Unmarshal(data, &ping)
if err != nil {
return errors.Wrapf(err, "fail to unmarshal ping message")
}
// create the pong message
pong := &types.PongMessage{
Type: types.Pong,
ClientSendTime: ping.ClientTime,
ServerReceiveTime: receiveTime,
ServerSendTime: utils.SystemMillis(),
}
// convert pong back to json
bytes, err := json.Marshal(pong)
if err != nil {
return errors.Wrapf(err, "fail to marshal pong message")
}
// make a string
message := string(bytes)
// write pong back
connection.Write(message)
return nil
}
}