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// Copyright 2018 ThousandEyes Inc.
//
// 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 server
import (
"sync"
"time"
"github.com/thousandeyes/shoelaces/internal/log"
)
const (
// InitTarget is an initial dummy target assigned to the servers
InitTarget = "NOTARGET"
)
// Server holds data that uniquely identifies a server
type Server struct {
Mac string
IP string
Hostname string
}
// Servers is an array of Server
type Servers []Server
// Len implementation for the sort Interface
func (s Servers) Len() int {
return len(s)
}
// Swap implementation for the sort interface
func (s Servers) Swap(i, j int) {
s[i], s[j] = s[j], s[i]
}
// Less implementation for the Sort interface
func (s Servers) Less(i, j int) bool {
return s[i].Mac < s[j].Mac
}
// State holds information regarding a host that is attempting to boot.
type State struct {
Server
Target string
Environment string
Params map[string]interface{}
Retry int
LastAccess int
}
// States holds a map between MAC addresses and
// States. It provides a mutex for thread-safety.
type States struct {
sync.RWMutex
Servers map[string]*State
}
// New returns a Server with is values initialized
func New(mac string, ip string, hostname string) Server {
return Server{
Mac: mac,
IP: ip,
Hostname: hostname,
}
}
// AddServer adds a server to the States struct
func (m *States) AddServer(server Server) {
m.Servers[server.Mac] = &State{
Server: server,
Target: InitTarget,
Retry: 1,
LastAccess: int(time.Now().UTC().Unix()),
}
}
// DeleteServer deletes a server from the States struct
func (m *States) DeleteServer(mac string) {
delete(m.Servers, mac)
}
// StartStateCleaner spawns a goroutine that cleans MAC addresses that
// have been inactive in Shoelaces for more than 3 minutes.
func StartStateCleaner(logger log.Logger, serverStates *States) {
const (
// 3 minutes
expireAfterSec = 3 * 60
cleanInterval = time.Minute
)
// Clean up the server states. Expire after 3 minutes
go func() {
for {
time.Sleep(cleanInterval)
servers := serverStates.Servers
expire := int(time.Now().UTC().Unix()) - expireAfterSec
logger.Debug("component", "polling", "msg", "Cleaning", "before", time.Unix(int64(expire), 0))
serverStates.Lock()
for mac, state := range servers {
if state.LastAccess <= expire {
delete(servers, mac)
logger.Debug("component", "polling", "msg", "Mac cleaned", "mac", mac)
}
}
serverStates.Unlock()
}
}()
}
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