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conf.go
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conf.go
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package plugins
import (
"encoding/json"
"sync"
"time"
"github.com/api7/ext-plugin-proto/go/A6"
pc "github.com/api7/ext-plugin-proto/go/A6/PrepareConf"
flatbuffers "github.com/google/flatbuffers/go"
"github.com/jellydator/ttlcache/v2"
)
var (
cache *ConfCache
)
type ConfInfo struct {
Name string // 插件名
Value string // 插件配置信息
}
type ConfEntry struct {
Name string // 插件名
Value interface{} // 插件配置信息对象
}
type RuleConf []ConfEntry
type ConfCache struct {
lock sync.Mutex
keyCache *ttlcache.Cache
}
func newConfCache(ttl time.Duration) *ConfCache {
cc := &ConfCache{}
for _, c := range []**ttlcache.Cache{&cc.keyCache} {
cache := ttlcache.NewCache()
err := cache.SetTTL(ttl)
if err != nil {
log().Fatal("failed to set global ttl for cache", "err", err)
}
cache.SkipTTLExtensionOnHit(false)
*c = cache
}
return cc
}
func (cc *ConfCache) Set(key string, pluginsConf map[string]interface{}) (string, error) {
cc.lock.Lock()
defer cc.lock.Unlock()
if key != "" {
_, err := cc.keyCache.Get(key)
if err == nil {
return key, nil
}
if err != ttlcache.ErrNotFound {
log().Error("failed to get cached token with key", "err", err)
// recreate the token
}
}
var (
entries = RuleConf{}
)
for name, info := range pluginsConf {
plugin := findPlugin(name)
if plugin == nil {
log().Warn("can't find plugin, skip", "name", name)
continue
}
log().Debug("prepare conf for plugin", "name", name)
var (
val []byte
err error
)
val, err = json.Marshal(info)
conf, err := plugin.ParseConf(val) // 解析value中的数据,即配置信息
if err != nil {
log().Error(
"failed to parse configuration for plugin",
"name", name, "configuration", val, "err", err)
continue
}
if conf != nil {
entries = append(entries, ConfEntry{
Name: name,
Value: conf,
})
}
}
err := cc.keyCache.Set(key, entries)
if err != nil {
return "", err
}
return key, err
}
func (cc *ConfCache) SetIn(key string, entries RuleConf) error {
cc.lock.Lock()
defer cc.lock.Unlock()
return cc.keyCache.Set(key, entries)
}
func (cc *ConfCache) Get(key string) (RuleConf, error) {
res, err := cc.keyCache.Get(key)
if err != nil {
return nil, err
}
return res.(RuleConf), err
}
func (cc *ConfCache) Delete(key string) error {
cc.lock.Lock()
defer cc.lock.Unlock()
return cc.keyCache.Remove(key)
}
func InitConfCache(ttl time.Duration) *ConfCache {
cache = newConfCache(ttl)
return cache
}
// PrepareConf 将请求的数据进行缓存
func PrepareConf(key string, pluginsConf map[string]interface{}) (string, error) {
return cache.Set(key, pluginsConf)
}
// GetRuleConf 从缓存中取数据
func GetRuleConf(key string) (RuleConf, error) {
return cache.Get(key)
}
// ConfToProto plugin conf to proto bytes
func ConfToProto(pluginName string, pluginConf string) []byte {
builder := flatbuffers.NewBuilder(1024)
name := builder.CreateString(pluginName) // 插件名称
value := builder.CreateString(pluginConf) // 插件的配置
// 生成proto
A6.TextEntryStart(builder) // entry的开始
A6.TextEntryAddName(builder, name) // entry添加名称
A6.TextEntryAddValue(builder, value) // entry添加值
te := A6.TextEntryEnd(builder) // entry的结束
pc.ReqStartConfVector(builder, 1) // 设置entry元素个数
builder.PrependUOffsetT(te)
v := builder.EndVector(1)
pc.ReqStart(builder)
pc.ReqAddConf(builder, v)
root := pc.ReqEnd(builder)
builder.Finish(root)
return builder.FinishedBytes()
}
func CreateRuleConf(uniqueKey string, entries []ConfInfo) []byte {
builder := flatbuffers.NewBuilder(1024)
key := builder.CreateString(uniqueKey)
entriesLen := len(entries)
var textEntries = make([]flatbuffers.UOffsetT, 0, entriesLen)
for _, entry := range entries {
name := builder.CreateString(entry.Name) // 插件名称
value := builder.CreateString(entry.Value) // 插件的配置
// 生成proto
A6.TextEntryStart(builder) // entry的开始
A6.TextEntryAddName(builder, name) // entry添加名称
A6.TextEntryAddValue(builder, value) // entry添加值
te := A6.TextEntryEnd(builder) // entry的结束
textEntries = append(textEntries, te)
}
pc.ReqStartConfVector(builder, entriesLen) // 设置entry元素个数
for i := entriesLen - 1; i >= 0; i-- {
offsetT := textEntries[i]
builder.PrependUOffsetT(offsetT)
}
confVec := builder.EndVector(entriesLen)
pc.ReqStart(builder)
pc.ReqAddKey(builder, key)
if confVec != 0 {
pc.ReqAddConf(builder, confVec)
}
root := pc.ReqEnd(builder)
builder.Finish(root)
return builder.FinishedBytes()
}