5050400886

Committed 22 May 2023 09:25PM UTC coverage: 62.185% (+0.05%) from 62.131%

Build Type

github

Committed by Reinaldo Oliveira

Commit Message

Adding documentation about the handshake validation process

Pull Request Pull Request #308: Add handshake validators

Run Details

84 of 84 new or added lines in 3 files covered. (100.0%)

4769 of 7669 relevant lines covered (62.19%)

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85.07

/session/session.go

// Copyright (c) nano Author and TFG Co. All Rights Reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package session

import (
        "context"
        "encoding/json"
        "fmt"
        "net"
        "reflect"
        "sync"
        "sync/atomic"
        "time"

        "github.com/golang/protobuf/proto"
        nats "github.com/nats-io/nats.go"
        "github.com/topfreegames/pitaya/v2/constants"
        "github.com/topfreegames/pitaya/v2/logger"
        "github.com/topfreegames/pitaya/v2/networkentity"
        "github.com/topfreegames/pitaya/v2/protos"
)

type sessionPoolImpl struct {
        sessionBindCallbacks []func(ctx context.Context, s Session) error
        afterBindCallbacks   []func(ctx context.Context, s Session) error
        handshakeValidators  map[string]func(data *HandshakeData) error

        // SessionCloseCallbacks contains global session close callbacks
        SessionCloseCallbacks []func(s Session)
        sessionsByUID         sync.Map
        sessionsByID          sync.Map
        sessionIDSvc          *sessionIDService
        // SessionCount keeps the current number of sessions
        SessionCount int64
}

// SessionPool centralizes all sessions within a Pitaya app
type SessionPool interface {
        NewSession(entity networkentity.NetworkEntity, frontend bool, UID ...string) Session
        GetSessionCount() int64
        GetSessionCloseCallbacks() []func(s Session)
        GetSessionByUID(uid string) Session
        GetSessionByID(id int64) Session
        OnSessionBind(f func(ctx context.Context, s Session) error)
        OnAfterSessionBind(f func(ctx context.Context, s Session) error)
        OnSessionClose(f func(s Session))
        CloseAll()
        AddHandshakeValidator(name string, f func(data *HandshakeData) error)
}

// HandshakeClientData represents information about the client sent on the handshake.
type HandshakeClientData struct {
        Platform    string `json:"platform"`
        LibVersion  string `json:"libVersion"`
        BuildNumber string `json:"clientBuildNumber"`
        Version     string `json:"clientVersion"`
}

// HandshakeData represents information about the handshake sent by the client.
// `sys` corresponds to information independent from the app and `user` information
// that depends on the app and is customized by the user.
type HandshakeData struct {
        Sys  HandshakeClientData    `json:"sys"`
        User map[string]interface{} `json:"user,omitempty"`
}

type sessionImpl struct {
        sync.RWMutex                                              // protect data
        id                  int64                                 // session global unique id
        uid                 string                                // binding user id
        lastTime            int64                                 // last heartbeat time
        entity              networkentity.NetworkEntity           // low-level network entity
        data                map[string]interface{}                // session data store
        handshakeData       *HandshakeData                        // handshake data received by the client
        handshakeValidators map[string]func(*HandshakeData) error // validations to run on handshake
        encodedData         []byte                                // session data encoded as a byte array
        OnCloseCallbacks    []func()                              //onClose callbacks
        IsFrontend          bool                                  // if session is a frontend session
        frontendID          string                                // the id of the frontend that owns the session
        frontendSessionID   int64                                 // the id of the session on the frontend server
        Subscriptions       []*nats.Subscription                  // subscription created on bind when using nats rpc server
        requestsInFlight    ReqInFlight                           // whether the session is waiting from a response from a remote
        pool                *sessionPoolImpl
}

type ReqInFlight struct {
        m  map[string]string
        mu sync.RWMutex
}

// Session represents a client session, which can store data during the connection.
// All data is released when the low-level connection is broken.
// Session instance related to the client will be passed to Handler method in the
// context parameter.
type Session interface {
        GetOnCloseCallbacks() []func()
        GetIsFrontend() bool
        GetSubscriptions() []*nats.Subscription
        SetOnCloseCallbacks(callbacks []func())
        SetIsFrontend(isFrontend bool)
        SetSubscriptions(subscriptions []*nats.Subscription)
        HasRequestsInFlight() bool
        GetRequestsInFlight() ReqInFlight
        SetRequestInFlight(reqID string, reqData string, inFlight bool)

        Push(route string, v interface{}) error
        ResponseMID(ctx context.Context, mid uint, v interface{}, err ...bool) error
        ID() int64
        UID() string
        GetData() map[string]interface{}
        SetData(data map[string]interface{}) error
        GetDataEncoded() []byte
        SetDataEncoded(encodedData []byte) error
        SetFrontendData(frontendID string, frontendSessionID int64)
        Bind(ctx context.Context, uid string) error
        Kick(ctx context.Context) error
        OnClose(c func()) error
        Close()
        RemoteAddr() net.Addr
        Remove(key string) error
        Set(key string, value interface{}) error
        HasKey(key string) bool
        Get(key string) interface{}
        Int(key string) int
        Int8(key string) int8
        Int16(key string) int16
        Int32(key string) int32
        Int64(key string) int64
        Uint(key string) uint
        Uint8(key string) uint8
        Uint16(key string) uint16
        Uint32(key string) uint32
        Uint64(key string) uint64
        Float32(key string) float32
        Float64(key string) float64
        String(key string) string
        Value(key string) interface{}
        PushToFront(ctx context.Context) error
        Clear()
        SetHandshakeData(data *HandshakeData)
        GetHandshakeData() *HandshakeData
        ValidateHandshake(data *HandshakeData) error
        GetHandshakeValidators() map[string]func(data *HandshakeData) error
}

type sessionIDService struct {
        sid int64
}

func newSessionIDService() *sessionIDService {
        return &sessionIDService{
                sid: 0,
        }
}

// SessionID returns the session id
func (c *sessionIDService) sessionID() int64 {
        return atomic.AddInt64(&c.sid, 1)
}

// NewSession returns a new session instance
// a networkentity.NetworkEntity is a low-level network instance
func (pool *sessionPoolImpl) NewSession(entity networkentity.NetworkEntity, frontend bool, UID ...string) Session {
        s := &sessionImpl{
                id:                  pool.sessionIDSvc.sessionID(),
                entity:              entity,
                data:                make(map[string]interface{}),
                handshakeData:       nil,
                handshakeValidators: pool.handshakeValidators,
                lastTime:            time.Now().Unix(),
                OnCloseCallbacks:    []func(){},
                IsFrontend:          frontend,
                pool:                pool,
                requestsInFlight:    ReqInFlight{m: make(map[string]string)},
        }
        if frontend {
                pool.sessionsByID.Store(s.id, s)
                atomic.AddInt64(&pool.SessionCount, 1)
        }
        if len(UID) > 0 {
                s.uid = UID[0]
        }
        return s
}

// NewSessionPool returns a new session pool instance
func NewSessionPool() SessionPool {
        return &sessionPoolImpl{
                sessionBindCallbacks:  make([]func(ctx context.Context, s Session) error, 0),
                afterBindCallbacks:    make([]func(ctx context.Context, s Session) error, 0),
                handshakeValidators:   make(map[string]func(data *HandshakeData) error, 0),
                SessionCloseCallbacks: make([]func(s Session), 0),
                sessionIDSvc:          newSessionIDService(),
        }
}

func (pool *sessionPoolImpl) GetSessionCount() int64 {
        return pool.SessionCount
}

func (pool *sessionPoolImpl) GetSessionCloseCallbacks() []func(s Session) {
        return pool.SessionCloseCallbacks
}

// GetSessionByUID return a session bound to an user id
func (pool *sessionPoolImpl) GetSessionByUID(uid string) Session {
        // TODO: Block this operation in backend servers
        if val, ok := pool.sessionsByUID.Load(uid); ok {
                return val.(Session)
        }
        return nil
}

// GetSessionByID return a session bound to a frontend server id
func (pool *sessionPoolImpl) GetSessionByID(id int64) Session {
        // TODO: Block this operation in backend servers
        if val, ok := pool.sessionsByID.Load(id); ok {
                return val.(Session)
        }
        return nil
}

// OnSessionBind adds a method to be called when a session is bound
// same function cannot be added twice!
func (pool *sessionPoolImpl) OnSessionBind(f func(ctx context.Context, s Session) error) {
        // Prevents the same function to be added twice in onSessionBind
        sf1 := reflect.ValueOf(f)
        for _, fun := range pool.sessionBindCallbacks {
                sf2 := reflect.ValueOf(fun)
                if sf1.Pointer() == sf2.Pointer() {
                        return
                }
        }
        pool.sessionBindCallbacks = append(pool.sessionBindCallbacks, f)
}

// OnAfterSessionBind adds a method to be called when session is bound and after all sessionBind callbacks
func (pool *sessionPoolImpl) OnAfterSessionBind(f func(ctx context.Context, s Session) error) {
        // Prevents the same function to be added twice in onSessionBind
        sf1 := reflect.ValueOf(f)
        for _, fun := range pool.afterBindCallbacks {
                sf2 := reflect.ValueOf(fun)
                if sf1.Pointer() == sf2.Pointer() {
                        return
                }
        }
        pool.afterBindCallbacks = append(pool.afterBindCallbacks, f)
}

// OnSessionClose adds a method that will be called when every session closes
func (pool *sessionPoolImpl) OnSessionClose(f func(s Session)) {
        sf1 := reflect.ValueOf(f)
        for _, fun := range pool.SessionCloseCallbacks {
                sf2 := reflect.ValueOf(fun)
                if sf1.Pointer() == sf2.Pointer() {
                        return
                }
        }
        pool.SessionCloseCallbacks = append(pool.SessionCloseCallbacks, f)
}

// CloseAll calls Close on all sessions
func (pool *sessionPoolImpl) CloseAll() {
        logger.Log.Infof("closing all sessions, %d sessions", pool.SessionCount)
        for pool.SessionCount > 0 {
                pool.sessionsByID.Range(func(_, value interface{}) bool {
                        s := value.(Session)
                        if s.HasRequestsInFlight() {
                                reqsInFlight := s.GetRequestsInFlight()
                                reqsInFlight.mu.RLock()
                                for _, route := range reqsInFlight.m {
                                        logger.Log.Debugf("Session for user %s is waiting on a response for route %s from a remote server. Delaying session close.", s.UID(), route)
                                }
                                reqsInFlight.mu.RUnlock()
                                return false
                        } else {
                                s.Close()
                                return true
                        }
                })
                logger.Log.Debugf("%d sessions remaining", pool.SessionCount)
                if pool.SessionCount > 0 {
                        time.Sleep(100 * time.Millisecond)
                }
        }
        logger.Log.Info("finished closing sessions")
}

// AddHandshakeValidator allows adds validation functions that will run when
// handshake packets are processed. Errors will be raised with the given name.
func (pool *sessionPoolImpl) AddHandshakeValidator(name string, f func(data *HandshakeData) error) {
        pool.handshakeValidators[name] = f
}

func (s *sessionImpl) updateEncodedData() error {
        var b []byte
        b, err := json.Marshal(s.data)
        if err != nil {
                return err
        }
        s.encodedData = b
        return nil
}

// GetOnCloseCallbacks ...
func (s *sessionImpl) GetOnCloseCallbacks() []func() {
        return s.OnCloseCallbacks
}

// GetIsFrontend ...
func (s *sessionImpl) GetIsFrontend() bool {
        return s.IsFrontend
}

// GetSubscriptions ...
func (s *sessionImpl) GetSubscriptions() []*nats.Subscription {
        return s.Subscriptions
}

// SetOnCloseCallbacks ...
func (s *sessionImpl) SetOnCloseCallbacks(callbacks []func()) {
        s.OnCloseCallbacks = callbacks
}

// SetIsFrontend ...
func (s *sessionImpl) SetIsFrontend(isFrontend bool) {
        s.IsFrontend = isFrontend
}

// SetSubscriptions ...
func (s *sessionImpl) SetSubscriptions(subscriptions []*nats.Subscription) {
        s.Subscriptions = subscriptions
}

// Push message to client
func (s *sessionImpl) Push(route string, v interface{}) error {
        return s.entity.Push(route, v)
}

// ResponseMID responses message to client, mid is
// request message ID
func (s *sessionImpl) ResponseMID(ctx context.Context, mid uint, v interface{}, err ...bool) error {
        return s.entity.ResponseMID(ctx, mid, v, err...)
}

// ID returns the session id
func (s *sessionImpl) ID() int64 {
        return s.id
}

// UID returns uid that bind to current session
func (s *sessionImpl) UID() string {
        return s.uid
}

// GetData gets the data
func (s *sessionImpl) GetData() map[string]interface{} {
        s.RLock()
        defer s.RUnlock()

        return s.data
}

// SetData sets the whole session data
func (s *sessionImpl) SetData(data map[string]interface{}) error {
        s.Lock()
        defer s.Unlock()

        s.data = data
        return s.updateEncodedData()
}

// GetDataEncoded returns the session data as an encoded value
func (s *sessionImpl) GetDataEncoded() []byte {
        return s.encodedData
}

// SetDataEncoded sets the whole session data from an encoded value
func (s *sessionImpl) SetDataEncoded(encodedData []byte) error {
        if len(encodedData) == 0 {
                return nil
        }
        var data map[string]interface{}
        err := json.Unmarshal(encodedData, &data)
        if err != nil {
                return err
        }
        return s.SetData(data)
}

// SetFrontendData sets frontend id and session id
func (s *sessionImpl) SetFrontendData(frontendID string, frontendSessionID int64) {
        s.frontendID = frontendID
        s.frontendSessionID = frontendSessionID
}

// Bind bind UID to current session
func (s *sessionImpl) Bind(ctx context.Context, uid string) error {
        if uid == "" {
                return constants.ErrIllegalUID
        }

        if s.UID() != "" {
                return constants.ErrSessionAlreadyBound
        }

        s.uid = uid
        for _, cb := range s.pool.sessionBindCallbacks {
                err := cb(ctx, s)
                if err != nil {
                        s.uid = ""
                        return err
                }
        }

        for _, cb := range s.pool.afterBindCallbacks {
                err := cb(ctx, s)
                if err != nil {
                        s.uid = ""
                        return err
                }
        }

        // if code running on frontend server
        if s.IsFrontend {
                s.pool.sessionsByUID.Store(uid, s)
        } else {
                // If frontentID is set this means it is a remote call and the current server
                // is not the frontend server that received the user request
                err := s.bindInFront(ctx)
                if err != nil {
                        logger.Log.Error("error while trying to push session to front: ", err)
                        s.uid = ""
                        return err
                }
        }
        return nil
}

// Kick kicks the user
func (s *sessionImpl) Kick(ctx context.Context) error {
        err := s.entity.Kick(ctx)
        if err != nil {
                return err
        }
        return s.entity.Close()
}

// OnClose adds the function it receives to the callbacks that will be called
// when the session is closed
func (s *sessionImpl) OnClose(c func()) error {
        if !s.IsFrontend {
                return constants.ErrOnCloseBackend
        }
        s.OnCloseCallbacks = append(s.OnCloseCallbacks, c)
        return nil
}

// Close terminates current session, session related data will not be released,
// all related data should be cleared explicitly in Session closed callback
func (s *sessionImpl) Close() {
        atomic.AddInt64(&s.pool.SessionCount, -1)
        s.pool.sessionsByID.Delete(s.ID())
        s.pool.sessionsByUID.Delete(s.UID())
        // TODO: this logic should be moved to nats rpc server
        if s.IsFrontend && s.Subscriptions != nil && len(s.Subscriptions) > 0 {
                // if the user is bound to an userid and nats rpc server is being used we need to unsubscribe
                for _, sub := range s.Subscriptions {
                        err := sub.Drain()
                        if err != nil {
                                logger.Log.Errorf("error unsubscribing to user's messages channel: %s, this can cause performance and leak issues", err.Error())
                        } else {
                                logger.Log.Debugf("successfully unsubscribed to user's %s messages channel", s.UID())
                        }
                }
        }
        s.entity.Close()
}

// RemoteAddr returns the remote network address.
func (s *sessionImpl) RemoteAddr() net.Addr {
        return s.entity.RemoteAddr()
}

// Remove delete data associated with the key from session storage
func (s *sessionImpl) Remove(key string) error {
        s.Lock()
        defer s.Unlock()

        delete(s.data, key)
        return s.updateEncodedData()
}

// Set associates value with the key in session storage
func (s *sessionImpl) Set(key string, value interface{}) error {
        s.Lock()
        defer s.Unlock()

        s.data[key] = value
        return s.updateEncodedData()
}

// HasKey decides whether a key has associated value
func (s *sessionImpl) HasKey(key string) bool {
        s.RLock()
        defer s.RUnlock()

        _, has := s.data[key]
        return has
}

// Get returns a key value
func (s *sessionImpl) Get(key string) interface{} {
        s.RLock()
        defer s.RUnlock()

        v, ok := s.data[key]
        if !ok {
                return nil
        }
        return v
}

// Int returns the value associated with the key as a int.
func (s *sessionImpl) Int(key string) int {
        s.RLock()
        defer s.RUnlock()

        v, ok := s.data[key]
        if !ok {
                return 0
        }

        value, ok := v.(int)
        if !ok {
                return 0
        }
        return value
}

// Int8 returns the value associated with the key as a int8.
func (s *sessionImpl) Int8(key string) int8 {
        s.RLock()
        defer s.RUnlock()

        v, ok := s.data[key]
        if !ok {
                return 0
        }

        value, ok := v.(int8)
        if !ok {
                return 0
        }
        return value
}

// Int16 returns the value associated with the key as a int16.
func (s *sessionImpl) Int16(key string) int16 {
        s.RLock()
        defer s.RUnlock()

        v, ok := s.data[key]
        if !ok {
                return 0
        }

        value, ok := v.(int16)
        if !ok {
                return 0
        }
        return value
}

// Int32 returns the value associated with the key as a int32.
func (s *sessionImpl) Int32(key string) int32 {
        s.RLock()
        defer s.RUnlock()

        v, ok := s.data[key]
        if !ok {
                return 0
        }

        value, ok := v.(int32)
        if !ok {
                return 0
        }
        return value
}

// Int64 returns the value associated with the key as a int64.
func (s *sessionImpl) Int64(key string) int64 {
        s.RLock()
        defer s.RUnlock()

        v, ok := s.data[key]
        if !ok {
                return 0
        }

        value, ok := v.(int64)
        if !ok {
                return 0
        }
        return value
}

// Uint returns the value associated with the key as a uint.
func (s *sessionImpl) Uint(key string) uint {
        s.RLock()
        defer s.RUnlock()

        v, ok := s.data[key]
        if !ok {
                return 0
        }

        value, ok := v.(uint)
        if !ok {
                return 0
        }
        return value
}

// Uint8 returns the value associated with the key as a uint8.
func (s *sessionImpl) Uint8(key string) uint8 {
        s.RLock()
        defer s.RUnlock()

        v, ok := s.data[key]
        if !ok {
                return 0
        }

        value, ok := v.(uint8)
        if !ok {
                return 0
        }
        return value
}

// Uint16 returns the value associated with the key as a uint16.
func (s *sessionImpl) Uint16(key string) uint16 {
        s.RLock()
        defer s.RUnlock()

        v, ok := s.data[key]
        if !ok {
                return 0
        }

        value, ok := v.(uint16)
        if !ok {
                return 0
        }
        return value
}

// Uint32 returns the value associated with the key as a uint32.
func (s *sessionImpl) Uint32(key string) uint32 {
        s.RLock()
        defer s.RUnlock()

        v, ok := s.data[key]
        if !ok {
                return 0
        }

        value, ok := v.(uint32)
        if !ok {
                return 0
        }
        return value
}

// Uint64 returns the value associated with the key as a uint64.
func (s *sessionImpl) Uint64(key string) uint64 {
        s.RLock()
        defer s.RUnlock()

        v, ok := s.data[key]
        if !ok {
                return 0
        }

        value, ok := v.(uint64)
        if !ok {
                return 0
        }
        return value
}

// Float32 returns the value associated with the key as a float32.
func (s *sessionImpl) Float32(key string) float32 {
        s.RLock()
        defer s.RUnlock()

        v, ok := s.data[key]
        if !ok {
                return 0
        }

        value, ok := v.(float32)
        if !ok {
                return 0
        }
        return value
}

// Float64 returns the value associated with the key as a float64.
func (s *sessionImpl) Float64(key string) float64 {
        s.RLock()
        defer s.RUnlock()

        v, ok := s.data[key]
        if !ok {
                return 0
        }

        value, ok := v.(float64)
        if !ok {
                return 0
        }
        return value
}

// String returns the value associated with the key as a string.
func (s *sessionImpl) String(key string) string {
        s.RLock()
        defer s.RUnlock()

        v, ok := s.data[key]
        if !ok {
                return ""
        }

        value, ok := v.(string)
        if !ok {
                return ""
        }
        return value
}

// Value returns the value associated with the key as a interface{}.
func (s *sessionImpl) Value(key string) interface{} {
        s.RLock()
        defer s.RUnlock()

        return s.data[key]
}

func (s *sessionImpl) bindInFront(ctx context.Context) error {
        return s.sendRequestToFront(ctx, constants.SessionBindRoute, false)
}

// PushToFront updates the session in the frontend
func (s *sessionImpl) PushToFront(ctx context.Context) error {
        if s.IsFrontend {
                return constants.ErrFrontSessionCantPushToFront
        }
        return s.sendRequestToFront(ctx, constants.SessionPushRoute, true)
}

// Clear releases all data related to current session
func (s *sessionImpl) Clear() {
        s.Lock()
        defer s.Unlock()

        s.uid = ""
        s.data = map[string]interface{}{}
        s.updateEncodedData()
}

// SetHandshakeData sets the handshake data received by the client.
func (s *sessionImpl) SetHandshakeData(data *HandshakeData) {
        s.Lock()
        defer s.Unlock()

        s.handshakeData = data
}

// GetHandshakeData gets the handshake data received by the client.
func (s *sessionImpl) GetHandshakeData() *HandshakeData {
        return s.handshakeData
}

// GetHandshakeValidators return the handshake validators associated with the session.
func (s *sessionImpl) GetHandshakeValidators() map[string]func(data *HandshakeData) error {
        return s.handshakeValidators
}

func (s *sessionImpl) ValidateHandshake(data *HandshakeData) error {
        for name, fun := range s.handshakeValidators {
                if err := fun(data); err != nil {
                        return fmt.Errorf("failed to run '%s' validator: %w. SessionId=%d", name, err, s.ID())
                }
        }

        return nil
}

func (s *sessionImpl) sendRequestToFront(ctx context.Context, route string, includeData bool) error {
        sessionData := &protos.Session{
                Id:  s.frontendSessionID,
                Uid: s.uid,
        }
        if includeData {
                sessionData.Data = s.encodedData
        }
        b, err := proto.Marshal(sessionData)
        if err != nil {
                return err
        }
        res, err := s.entity.SendRequest(ctx, s.frontendID, route, b)
        if err != nil {
                return err
        }
        logger.Log.Debugf("%s Got response: %+v", route, res)
        return nil
}

func (s *sessionImpl) HasRequestsInFlight() bool {
        return len(s.requestsInFlight.m) != 0
}

func (s *sessionImpl) GetRequestsInFlight() ReqInFlight {
        return s.requestsInFlight
}

func (s *sessionImpl) SetRequestInFlight(reqID string, reqData string, inFlight bool) {
        s.requestsInFlight.mu.Lock()
        if inFlight {
                s.requestsInFlight.m[reqID] = reqData
        } else {
                if _, ok := s.requestsInFlight.m[reqID]; ok {
                        delete(s.requestsInFlight.m, reqID)
                }
        }
        s.requestsInFlight.mu.Unlock()
}

topfreegames / pitaya / 5050400886

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