nats_rpc_common.go

// Copyright (c) TFG Co. All Rights Reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package cluster

import (
	"fmt"

	nats "github.com/nats-io/go-nats"
	"github.com/topfreegames/pitaya/logger"
)

func getChannel(serverType, serverID string) string {
	return fmt.Sprintf("pitaya/servers/%s/%s", serverType, serverID)
}

func setupNatsConn(connectString string, appDieChan chan bool, options ...nats.Option) (*nats.Conn, error) {
	natsOptions := append(
		options,
		nats.DisconnectHandler(func(_ *nats.Conn) {
			logger.Log.Warn("disconnected from nats!")
		}),
		nats.ReconnectHandler(func(nc *nats.Conn) {
			logger.Log.Warnf("reconnected to nats %s!", nc.ConnectedUrl())
		}),
		nats.ClosedHandler(func(nc *nats.Conn) {
			err := nc.LastError()
			if err == nil {
				logger.Log.Warn("nats connection closed with no error.")
				return
			}

			logger.Log.Errorf("nats connection closed. reason: %q", nc.LastError())
			if appDieChan != nil {
				appDieChan <- true
			}
		}),
	)

	nc, err := nats.Connect(connectString, natsOptions...)
	if err != nil {
		return nil, err
	}
	return nc, nil
}