registration_db.go
package nsqlookupd
import (
"fmt"
"sync"
"sync/atomic"
"time"
)
//db（注册中心--内存数据库map）结构体
type RegistrationDB struct {
sync.RWMutex //读写锁
registrationMap map[Registration]Producers //
}
//代表一个生产者 主题 通道
type Registration struct {
Category string //主题
Key string //通道
SubKey string //
}
type Registrations []Registration
//代表客户端nsqd 的配置信息
type PeerInfo struct {
lastUpdate int64
id string
RemoteAddress string `json:"remote_address"`
Hostname string `json:"hostname"`
BroadcastAddress string `json:"broadcast_address"`
TCPPort int `json:"tcp_port"`
HTTPPort int `json:"http_port"`
Version string `json:"version"`
}
//生产者
type Producer struct {
peerInfo *PeerInfo
tombstoned bool
tombstonedAt time.Time
}
type Producers []*Producer
func (p *Producer) String() string {
return fmt.Sprintf("%s [%d, %d]", p.peerInfo.BroadcastAddress, p.peerInfo.TCPPort, p.peerInfo.HTTPPort)
}
func (p *Producer) Tombstone() {
p.tombstoned = true
p.tombstonedAt = time.Now()
}
func (p *Producer) IsTombstoned(lifetime time.Duration) bool {
return p.tombstoned && time.Now().Sub(p.tombstonedAt) < lifetime
}
func NewRegistrationDB() *RegistrationDB {
return &RegistrationDB{
registrationMap: make(map[Registration]Producers),
}
}
// add a registration key
func (r *RegistrationDB) AddRegistration(k Registration) {
r.Lock()
defer r.Unlock()
_, ok := r.registrationMap[k]
if !ok {
r.registrationMap[k] = Producers{}
}
}
// add a producer to a registration
func (r *RegistrationDB) AddProducer(k Registration, p *Producer) bool {
r.Lock()
defer r.Unlock()
producers := r.registrationMap[k]
found := false
for _, producer := range producers {
if producer.peerInfo.id == p.peerInfo.id {
found = true
}
}
if found == false {
r.registrationMap[k] = append(producers, p)
}
return !found
}
// remove a producer from a registration
func (r *RegistrationDB) RemoveProducer(k Registration, id string) (bool, int) {
r.Lock()
defer r.Unlock()
producers, ok := r.registrationMap[k]
if !ok {
return false, 0
}
removed := false
cleaned := Producers{}
for _, producer := range producers {
if producer.peerInfo.id != id {
cleaned = append(cleaned, producer)
} else {
removed = true
}
}
// Note: this leaves keys in the DB even if they have empty lists
r.registrationMap[k] = cleaned
return removed, len(cleaned)
}
// remove a Registration and all it's producers
func (r *RegistrationDB) RemoveRegistration(k Registration) {
r.Lock()
defer r.Unlock()
delete(r.registrationMap, k)
}
func (r *RegistrationDB) needFilter(key string, subkey string) bool {
return key == "*" || subkey == "*"
}
func (r *RegistrationDB) FindRegistrations(category string, key string, subkey string) Registrations {
r.RLock()
defer r.RUnlock()
if !r.needFilter(key, subkey) {
k := Registration{category, key, subkey}
if _, ok := r.registrationMap[k]; ok {
return Registrations{k}
}
return Registrations{}
}
results := Registrations{}
for k := range r.registrationMap {
if !k.IsMatch(category, key, subkey) {
continue
}
results = append(results, k)
}
return results
}
func (r *RegistrationDB) FindProducers(category string, key string, subkey string) Producers {
r.RLock()
defer r.RUnlock()
if !r.needFilter(key, subkey) {
k := Registration{category, key, subkey}
return r.registrationMap[k]
}
results := Producers{}
for k, producers := range r.registrationMap {
if !k.IsMatch(category, key, subkey) {
continue
}
for _, producer := range producers {
found := false
for _, p := range results {
if producer.peerInfo.id == p.peerInfo.id {
found = true
}
}
if found == false {
results = append(results, producer)
}
}
}
return results
}
func (r *RegistrationDB) LookupRegistrations(id string) Registrations {
r.RLock()
defer r.RUnlock()
results := Registrations{}
for k, producers := range r.registrationMap {
for _, p := range producers {
if p.peerInfo.id == id {
results = append(results, k)
break
}
}
}
return results
}
func (k Registration) IsMatch(category string, key string, subkey string) bool {
if category != k.Category {
return false
}
if key != "*" && k.Key != key {
return false
}
if subkey != "*" && k.SubKey != subkey {
return false
}
return true
}
func (rr Registrations) Filter(category string, key string, subkey string) Registrations {
output := Registrations{}
for _, k := range rr {
if k.IsMatch(category, key, subkey) {
output = append(output, k)
}
}
return output
}
func (rr Registrations) Keys() []string {
keys := make([]string, len(rr))
for i, k := range rr {
keys[i] = k.Key
}
return keys
}
func (rr Registrations) SubKeys() []string {
subkeys := make([]string, len(rr))
for i, k := range rr {
subkeys[i] = k.SubKey
}
return subkeys
}
func (pp Producers) FilterByActive(inactivityTimeout time.Duration, tombstoneLifetime time.Duration) Producers {
now := time.Now()
results := Producers{}
for _, p := range pp {
cur := time.Unix(0, atomic.LoadInt64(&p.peerInfo.lastUpdate))
if now.Sub(cur) > inactivityTimeout || p.IsTombstoned(tombstoneLifetime) {
continue
}
results = append(results, p)
}
return results
}
func (pp Producers) PeerInfo() []*PeerInfo {
results := []*PeerInfo{}
for _, p := range pp {
results = append(results, p.peerInfo)
}
return results
}
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