v2ray-core/app/router/rules/router.go

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package rules
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import (
"errors"
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"time"
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"github.com/v2ray/v2ray-core/app/router"
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"github.com/v2ray/v2ray-core/common/collect"
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v2net "github.com/v2ray/v2ray-core/common/net"
)
var (
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ErrorInvalidRule = errors.New("Invalid Rule")
ErrorNoRuleApplicable = errors.New("No rule applicable")
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)
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type cacheEntry struct {
tag string
err error
validUntil time.Time
}
func newCacheEntry(tag string, err error) *cacheEntry {
this := &cacheEntry{
tag: tag,
err: err,
}
this.Extend()
return this
}
func (this *cacheEntry) IsValid() bool {
return this.validUntil.Before(time.Now())
}
func (this *cacheEntry) Extend() {
this.validUntil = time.Now().Add(time.Hour)
}
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type Router struct {
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config *RouterRuleConfig
cache *collect.ValidityMap
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}
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func NewRouter(config *RouterRuleConfig) *Router {
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return &Router{
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config: config,
cache: collect.NewValidityMap(3600),
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}
}
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func (this *Router) takeDetourWithoutCache(dest v2net.Destination) (string, error) {
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for _, rule := range this.config.Rules {
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if rule.Apply(dest) {
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return rule.Tag, nil
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}
}
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return "", ErrorNoRuleApplicable
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}
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func (this *Router) TakeDetour(dest v2net.Destination) (string, error) {
rawEntry := this.cache.Get(dest)
if rawEntry == nil {
tag, err := this.takeDetourWithoutCache(dest)
this.cache.Set(dest, newCacheEntry(tag, err))
return tag, err
}
entry := rawEntry.(*cacheEntry)
return entry.tag, entry.err
}
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type RouterFactory struct {
}
func (this *RouterFactory) Create(rawConfig interface{}) (router.Router, error) {
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return NewRouter(rawConfig.(*RouterRuleConfig)), nil
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}
func init() {
router.RegisterRouter("rules", &RouterFactory{})
}