container-go/server/server-handler.go

package server

import (
	"fmt"
	"io/ioutil"
	"net"
	"os"
	"reflect"
	"strconv"

	logging "git.loafle.net/commons/logging-go"
	"git.loafle.net/commons/server-go"
	cssn "git.loafle.net/commons/server-go/socket/net"
	occi "git.loafle.net/overflow/commons-go/core/interfaces"
)

type ServerHandler interface {
	cssn.ServerHandler
}

type ServerHandlers struct {
	cssn.ServerHandlers

	PIDFilePath     string
	Services        []interface{}
	OrderedServices []reflect.Type

	port int
}

func (sh *ServerHandlers) Init(serverCtx server.ServerCtx) error {
	if err := sh.ServerHandlers.Init(serverCtx); nil != err {
		return err
	}

	if err := occi.ExecServices(sh.Services, occi.ServiceMethodInit, sh.OrderedServices, false); nil != err {
		return err
	}

	return nil
}

func (sh *ServerHandlers) OnStart(serverCtx server.ServerCtx) error {
	if err := sh.ServerHandlers.OnStart(serverCtx); nil != err {
		return err
	}

	if err := occi.ExecServices(sh.Services, occi.ServiceMethodStart, sh.OrderedServices, false); nil != err {
		return err
	}

	if _, err := os.Stat(sh.PIDFilePath); os.IsExist(err) {
		if err := os.Remove(sh.PIDFilePath); nil != err {
			logging.Logger().Errorf("Container[%s]: Removing pid file has been failed [%v]", sh.Name, err)
		}
	}

	s := strconv.FormatInt(int64(sh.port), 10)
	if err := ioutil.WriteFile(sh.PIDFilePath, []byte(s), os.ModePerm); nil != err {
		return err
	}

	return nil
}

func (sh *ServerHandlers) OnStop(serverCtx server.ServerCtx) {
	if err := occi.ExecServices(sh.Services, occi.ServiceMethodStop, sh.OrderedServices, true); nil != err {
		logging.Logger().Errorf("Container[%s]: Service stop err %v", sh.Name, err)
	}

	if _, err := os.Stat(sh.PIDFilePath); os.IsExist(err) {
		if err := os.Remove(sh.PIDFilePath); nil != err {
			logging.Logger().Errorf("Container: Removing pid file has been failed [%v]", err)
		}
	}

	sh.ServerHandlers.OnStop(serverCtx)
}

func (sh *ServerHandlers) Destroy(serverCtx server.ServerCtx) {
	if err := occi.ExecServices(sh.Services, occi.ServiceMethodDestroy, sh.OrderedServices, true); nil != err {
		logging.Logger().Errorf("Container[%s]: Service destroy err %v", sh.Name, err)
	}

	sh.ServerHandlers.Destroy(serverCtx)
}

func (sh *ServerHandlers) Listener(serverCtx server.ServerCtx) (net.Listener, error) {
	for i := 60000; i < 61000; i++ {
		addr := fmt.Sprintf("localhost:%d", i)
		l, err := net.Listen("tcp", addr)
		if nil == err {
			sh.port = i
			return l, nil
		}
	}

	return nil, fmt.Errorf("Container[%s]: Cannot find availrable port", sh.Name)
}

func (sh *ServerHandlers) Validate() error {
	if err := sh.ServerHandlers.Validate(); nil != err {
		return err
	}

	if "" == sh.PIDFilePath {
		return fmt.Errorf("Container[%s]: The path of pid file must be specified", sh.Name)
	}

	if nil == sh.Services {
		return fmt.Errorf("Container[%s]: Services must be specified", sh.Name)
	}

	if nil == sh.OrderedServices {
		return fmt.Errorf("Container[%s]: OrderedServices must be specified", sh.Name)
	}

	return nil
}