# open-ethereum-pool以太坊礦池-policy模組
## PolicyServer定義
```go
type PolicyServer struct {
sync.RWMutex
statsMu sync.Mutex
config *Config
stats map[string]*Stats
banChannel chan string
startedAt int64
grace int64
timeout int64
blacklist []string
whitelist []string
storage *storage.RedisClient
}
```
## policy流程圖
## GetBlacklist和GetWhitelist
```go
// Always returns list of addresses. If Redis fails it will return empty list.
func (r *RedisClient) GetBlacklist() ([]string, error) {
//SMEMBERS eth:blacklist
//Smembers 命令返回集合中的所有的成員
cmd := r.client.SMembers(r.formatKey("blacklist"))
if cmd.Err() != nil {
return []string{}, cmd.Err()
}
return cmd.Val(), nil
}
// Always returns list of IPs. If Redis fails it will return empty list.
func (r *RedisClient) GetWhitelist() ([]string, error) {
//SMEMBERS eth:whitelist
//Smembers 命令返回集合中的所有的成員
cmd := r.client.SMembers(r.formatKey("whitelist"))
if cmd.Err() != nil {
return []string{}, cmd.Err()
}
return cmd.Val(), nil
}
```
## IsBanned
```go
func (s *PolicyServer) IsBanned(ip string) bool {
x := s.Get(ip)
return atomic.LoadInt32(&x.Banned) > 0
}
func (s *PolicyServer) Get(ip string) *Stats {
s.statsMu.Lock()
defer s.statsMu.Unlock()
if x, ok := s.stats[ip]; !ok {
x = s.NewStats()
s.stats[ip] = x
return x
} else {
x.heartbeat()
return x
}
}
func (s *PolicyServer) NewStats() *Stats {
x := &Stats{
ConnLimit: s.config.Limits.Limit,
}
x.heartbeat()
return x
}
```
## 處理ApplyMalformedPolicy
```go
//應用格式錯誤的策略
//malformedLimit為5次
func (s *PolicyServer) ApplyMalformedPolicy(ip string) bool {
x := s.Get(ip)
n := x.incrMalformed()
if n >= s.config.Banning.MalformedLimit {
s.forceBan(x, ip)
return false
}
return true
}
func (x *Stats) incrMalformed() int32 {
return atomic.AddInt32(&x.Malformed, 1)
}
func (s *PolicyServer) forceBan(x *Stats, ip string) {
//沒啟用Banning或在白名單
if !s.config.Banning.Enabled || s.InWhiteList(ip) {
return
}
atomic.StoreInt64(&x.BannedAt, util.MakeTimestamp())
//x.Banned賦值為1
if atomic.CompareAndSwapInt32(&x.Banned, 0, 1) {
//"ipset": "blacklist",
if len(s.config.Banning.IPSet) > 0 {
s.banChannel <- ip
} else {
log.Println("Banned peer", ip)
}
}
}
```
## 處理ApplyLoginPolicy
```go
func (s *PolicyServer) ApplyLoginPolicy(addy, ip string) bool {
if s.InBlackList(addy) {
x := s.Get(ip)
s.forceBan(x, ip)
return false
}
return true
}
func (s *PolicyServer) InBlackList(addy string) bool {
s.RLock()
defer s.RUnlock()
return util.StringInSlice(addy, s.blacklist)
}
```
## 處理ApplyLoginPolicy
```go
func (s *PolicyServer) ApplySharePolicy(ip string, validShare bool) bool {
x := s.Get(ip)
x.Lock()
if validShare {
x.ValidShares++
if s.config.Limits.Enabled {
//Increase allowed number of connections on each valid share
//每個有效share可以增加的連線數
//"limitJump": 10
x.incrLimit(s.config.Limits.LimitJump)
}
} else {
x.InvalidShares++
}
totalShares := x.ValidShares + x.InvalidShares
//Check after after miner submitted this number of shares
//30個shares後檢查
//"checkThreshold": 30,
if totalShares < s.config.Banning.CheckThreshold {
x.Unlock()
return true
}
validShares := float32(x.ValidShares)
invalidShares := float32(x.InvalidShares)
x.resetShares()
x.Unlock()
//無效share比例
ratio := invalidShares / validShares
// Percent of invalid shares from all shares to ban miner
//"invalidPercent": 30,
if ratio >= s.config.Banning.InvalidPercent/100.0 {
s.forceBan(x, ip)
return false
}
return true
}
//加
func (x *Stats) incrLimit(n int32) {
atomic.AddInt32(&x.ConnLimit, n)
}
//reset
func (x *Stats) resetShares() {
x.ValidShares = 0
x.InvalidShares = 0
}
```
## 處理ApplyLimitPolicy
```go
func (s *PolicyServer) ApplyLimitPolicy(ip string) bool {
if !s.config.Limits.Enabled {
return true
}
now := util.MakeTimestamp()
//"grace": "5m",
if now-s.startedAt > s.grace {
//減1
return s.Get(ip).decrLimit() > 0
}
return true
}
func (x *Stats) decrLimit() int32 {
return atomic.AddInt32(&x.ConnLimit, -1)
}
```
## 處理BanClient
```go
func (s *PolicyServer) BanClient(ip string) {
x := s.Get(ip)
s.forceBan(x, ip)
}
```
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