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127 lines
3.0 KiB
127 lines
3.0 KiB
package point
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import (
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"sync"
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"time"
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"github.com/v2ray/v2ray-core/app"
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"github.com/v2ray/v2ray-core/common/dice"
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"github.com/v2ray/v2ray-core/common/log"
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v2net "github.com/v2ray/v2ray-core/common/net"
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"github.com/v2ray/v2ray-core/common/retry"
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"github.com/v2ray/v2ray-core/proxy"
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proxyrepo "github.com/v2ray/v2ray-core/proxy/repo"
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)
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type InboundDetourHandlerDynamic struct {
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sync.RWMutex
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space app.Space
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config *InboundDetourConfig
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portsInUse map[v2net.Port]bool
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ichInUse []proxy.InboundHandler
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ich2Recycle []proxy.InboundHandler
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lastRefresh time.Time
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}
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func NewInboundDetourHandlerDynamic(space app.Space, config *InboundDetourConfig) (*InboundDetourHandlerDynamic, error) {
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handler := &InboundDetourHandlerDynamic{
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space: space,
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config: config,
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portsInUse: make(map[v2net.Port]bool),
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}
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ichCount := config.Allocation.Concurrency
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ichArray := make([]proxy.InboundHandler, ichCount*2)
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for idx, _ := range ichArray {
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ich, err := proxyrepo.CreateInboundHandler(config.Protocol, space, config.Settings)
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if err != nil {
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log.Error("Point: Failed to create inbound connection handler: ", err)
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return nil, err
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}
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ichArray[idx] = ich
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}
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handler.ichInUse = ichArray[:ichCount]
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handler.ich2Recycle = ichArray[ichCount:]
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return handler, nil
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}
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func (this *InboundDetourHandlerDynamic) pickUnusedPort() v2net.Port {
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delta := int(this.config.PortRange.To) - int(this.config.PortRange.From) + 1
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for {
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r := dice.Roll(delta)
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port := this.config.PortRange.From + v2net.Port(r)
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_, used := this.portsInUse[port]
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if !used {
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this.portsInUse[port] = true
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return port
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}
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}
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}
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func (this *InboundDetourHandlerDynamic) GetConnectionHandler() (proxy.InboundHandler, int) {
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this.RLock()
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defer this.RUnlock()
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ich := this.ichInUse[dice.Roll(len(this.ichInUse))]
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until := this.config.Allocation.Refresh - int((time.Now().Unix()-this.lastRefresh.Unix())/60/1000)
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if until < 0 {
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until = 0
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}
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return ich, int(until)
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}
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func (this *InboundDetourHandlerDynamic) Close() {
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this.Lock()
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defer this.Unlock()
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for _, ich := range this.ichInUse {
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ich.Close()
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}
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if this.ich2Recycle != nil {
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for _, ich := range this.ich2Recycle {
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if ich != nil {
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ich.Close()
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}
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}
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}
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}
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func (this *InboundDetourHandlerDynamic) refresh() error {
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this.Lock()
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defer this.Unlock()
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this.lastRefresh = time.Now()
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this.ich2Recycle, this.ichInUse = this.ichInUse, this.ich2Recycle
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for _, ich := range this.ichInUse {
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delete(this.portsInUse, ich.Port())
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ich.Close()
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port := this.pickUnusedPort()
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err := retry.Timed(100 /* times */, 100 /* ms */).On(func() error {
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err := ich.Listen(port)
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if err != nil {
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log.Error("Point: Failed to start inbound detour on port ", port, ": ", err)
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return err
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}
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return nil
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})
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (this *InboundDetourHandlerDynamic) Start() error {
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err := this.refresh()
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if err != nil {
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return err
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}
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go func() {
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for range time.Tick(time.Duration(this.config.Allocation.Refresh) * time.Minute) {
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this.refresh()
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}
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}()
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return nil
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}
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