/
host.go
146 lines (122 loc) · 2.75 KB
/
host.go
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package resolver
import (
"context"
"net"
"sync"
"sync/atomic"
"time"
logApi "github.com/ndmsystems/go/api/log"
)
const (
oldHostDuration = 30 * time.Minute
retryIntervalSec = 10
)
// host ...
type host struct {
tag string
hostName string
ip4 *ips
ip6 *ips
lastTime int64
// eaFlag - flag means explicitly added host
eaFlag bool
dnsClient *dnsClient
logger logApi.Logger
ready sync.WaitGroup
stopCh chan struct{}
static bool
}
func newStaticHost(tag string, hName string, eaFlag bool, mapings map[string][]string, logger logApi.Logger) *host {
h := &host{
tag: tag,
hostName: hName,
eaFlag: eaFlag,
ip4: newIpsFromList(mapings["ip4"]),
ip6: newIpsFromList(mapings["ip6"]),
lastTime: time.Now().Unix(),
static: true,
logger: logger,
}
return h
}
// newHost ...
func newHost(tag string, hName string, eaFlag bool, dnsClient *dnsClient, logger logApi.Logger) *host {
h := &host{
tag: tag,
hostName: hName,
eaFlag: eaFlag,
ip4: newIps(),
ip6: newIps(),
lastTime: time.Now().Unix(),
dnsClient: dnsClient,
logger: logger,
stopCh: make(chan struct{}),
}
h.ready.Add(1)
go h.reloadIPsLoop()
return h
}
// getNextIP4WithIndex ...
func (h *host) getNextIP4WithIndex() (net.IP, int) {
h.ready.Wait()
defer h.updLastTime()
return h.ip4.getNextIPWithIndex()
}
// getNextIP6WithIndex ...
func (h *host) getNextIP6WithIndex() (net.IP, int) {
h.ready.Wait()
defer h.updLastTime()
return h.ip6.getNextIPWithIndex()
}
// getIPs ...
func (h *host) getIPs() ([]net.IP, []net.IP) {
h.ready.Wait()
return h.ip4.getList(), h.ip6.getList()
}
// reloadIPsLoop ...
func (h *host) reloadIPsLoop() {
ttl := h.reloadIPs()
h.ready.Done()
ttlCh := time.After(time.Duration(ttl) * time.Second)
for {
select {
case <-h.stopCh:
h.logger.Info().Println(h.tag, "Stop resolving host", h.hostName)
return
case <-ttlCh:
ttl = h.reloadIPs()
ttlCh = time.After(time.Duration(ttl) * time.Second)
}
}
}
// reloadIPs ...
func (h *host) reloadIPs() uint32 {
ip4, ip6, ttl, err := h.dnsClient.lookupHost(context.Background(), h.hostName)
if err != nil {
h.logger.Error().Println(h.tag, "Error reloading ips for host", h.hostName, err)
return retryIntervalSec
}
h.ip4.setIpList(ip4)
h.ip6.setIpList(ip6)
return ttl
}
// isOld ...
func (h *host) isOld() bool {
lastTime := atomic.LoadInt64(&h.lastTime)
return lastTime < time.Now().Add(-oldHostDuration).Unix()
}
// isExplicitlyAdded ...
func (h *host) isExplicitlyAdded() bool {
return h.eaFlag
}
func (h *host) isStatic() bool {
return h.static
}
// stop ...
func (h *host) stop() {
close(h.stopCh)
}
// updLastTime ...
func (h *host) updLastTime() {
atomic.StoreInt64(&h.lastTime, time.Now().Unix())
}