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matchmaker.go
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matchmaker.go
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// Copyright 2017 The Nakama Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package server
import (
"errors"
"github.com/satori/go.uuid"
"sync"
)
type Matchmaker interface {
Add(sessionID uuid.UUID, userID uuid.UUID, meta PresenceMeta, requiredCount int64) (uuid.UUID, map[MatchmakerKey]*MatchmakerProfile)
Remove(sessionID uuid.UUID, userID uuid.UUID, ticket uuid.UUID) error
RemoveAll(sessionID uuid.UUID)
UpdateAll(sessionID uuid.UUID, meta PresenceMeta)
}
type MatchmakerKey struct {
ID PresenceID
UserID uuid.UUID
Ticket uuid.UUID
}
type MatchmakerProfile struct {
Meta PresenceMeta
RequiredCount int64
}
type MatchmakerService struct {
sync.Mutex
name string
values map[MatchmakerKey]*MatchmakerProfile
}
func NewMatchmakerService(name string) *MatchmakerService {
return &MatchmakerService{
name: name,
values: make(map[MatchmakerKey]*MatchmakerProfile),
}
}
func (m *MatchmakerService) Add(sessionID uuid.UUID, userID uuid.UUID, meta PresenceMeta, requiredCount int64) (uuid.UUID, map[MatchmakerKey]*MatchmakerProfile) {
ticket := uuid.NewV4()
selected := make(map[MatchmakerKey]*MatchmakerProfile, requiredCount-1)
qmk := MatchmakerKey{ID: PresenceID{SessionID: sessionID, Node: m.name}, UserID: userID, Ticket: ticket}
qmp := &MatchmakerProfile{Meta: meta, RequiredCount: requiredCount}
m.Lock()
for mk, mp := range m.values {
if mk.ID.SessionID != sessionID && mk.UserID != userID && mp.RequiredCount == requiredCount {
selected[mk] = mp
if int64(len(selected)) == requiredCount-1 {
break
}
}
}
if int64(len(selected)) == requiredCount-1 {
for mk, _ := range selected {
delete(m.values, mk)
}
selected[qmk] = qmp
} else {
m.values[qmk] = qmp
}
m.Unlock()
if int64(len(selected)) != requiredCount {
return ticket, nil
} else {
return ticket, selected
}
}
func (m *MatchmakerService) Remove(sessionID uuid.UUID, userID uuid.UUID, ticket uuid.UUID) error {
mk := MatchmakerKey{ID: PresenceID{SessionID: sessionID, Node: m.name}, UserID: userID, Ticket: ticket}
var e error
m.Lock()
_, ok := m.values[mk]
if ok {
delete(m.values, mk)
} else {
e = errors.New("ticket not found")
}
m.Unlock()
return e
}
func (m *MatchmakerService) RemoveAll(sessionID uuid.UUID) {
m.Lock()
for mk, _ := range m.values {
if mk.ID.SessionID == sessionID {
delete(m.values, mk)
}
}
m.Unlock()
}
func (m *MatchmakerService) UpdateAll(sessionID uuid.UUID, meta PresenceMeta) {
m.Lock()
for mk, mp := range m.values {
if mk.ID.SessionID == sessionID {
mp.Meta = meta
}
}
m.Unlock()
}