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|
package session
import (
"context"
"crypto/ed25519"
"crypto/rand"
"net"
"sync"
"time"
"github.com/kyren223/eko/internal/packet"
"github.com/kyren223/eko/pkg/assert"
"github.com/kyren223/eko/pkg/snowflake"
)
const (
WriteQueueSize = 10
NonceSize = 32
)
type SessionManager interface {
AddSession(session *Session, userId snowflake.ID, pubKey ed25519.PublicKey)
RemoveSession(id snowflake.ID)
Session(id snowflake.ID) *Session
UseSessions(f func(map[snowflake.ID]*Session))
Node() *snowflake.Node
}
type Session struct {
manager SessionManager
addr *net.TCPAddr
cancel context.CancelFunc
writeQueue chan packet.Packet
writerWg *sync.WaitGroup
writeMu sync.RWMutex
issuedTime time.Time
challenge []byte
isTosAccepted bool
pubKey ed25519.PublicKey
id snowflake.ID
mu sync.Mutex
}
func NewSession(
manager SessionManager,
addr *net.TCPAddr, cancel context.CancelFunc,
writerWg *sync.WaitGroup,
) *Session {
assert.NotNil(addr, "tcp address should be valid")
assert.NotNil(manager, "session manager should be valid")
session := &Session{
manager: manager,
addr: addr,
cancel: cancel,
writeQueue: make(chan packet.Packet, WriteQueueSize),
writerWg: writerWg,
writeMu: sync.RWMutex{},
issuedTime: time.Time{},
challenge: make([]byte, NonceSize),
pubKey: ed25519.PublicKey{},
id: snowflake.InvalidID,
mu: sync.Mutex{},
isTosAccepted: false,
}
return session
}
func (s *Session) Addr() *net.TCPAddr {
assert.NotNil(s.addr, "tcp address should be valid")
return s.addr
}
func (s *Session) IsTosAccepted() bool {
return s.isTosAccepted
}
func (s *Session) ReceivedTosAcceptance() {
s.isTosAccepted = true
}
func (s *Session) IsAuthenticated() bool {
return s.id != snowflake.InvalidID
}
func (s *Session) ID() snowflake.ID {
assert.Assert(s.IsAuthenticated(), "use of ID in an unauthenticated session", "addr", s.addr)
return s.id
}
func (s *Session) PubKey() ed25519.PublicKey {
assert.Assert(s.IsAuthenticated(), "use of PubKey in an unauthenticated session", "addr", s.addr)
return s.pubKey
}
func (s *Session) Promote(userId snowflake.ID, pubKey ed25519.PublicKey) {
s.id = userId
s.pubKey = pubKey
}
func (s *Session) Manager() SessionManager {
return s.manager
}
func (s *Session) Challenge() []byte {
s.mu.Lock()
defer s.mu.Unlock()
if time.Since(s.issuedTime) > time.Minute {
s.issuedTime = time.Now()
_, err := rand.Read(s.challenge)
assert.NoError(err, "random should always produce a value")
}
return s.challenge
}
func (s *Session) Write(ctx context.Context, pkt packet.Packet) bool {
s.writerWg.Add(1)
defer s.writerWg.Done()
s.writeMu.RLock()
defer s.writeMu.RUnlock()
select {
case s.writeQueue <- pkt:
return true
case <-ctx.Done():
return false
}
}
func (s *Session) Read() <-chan packet.Packet {
s.writeMu.RLock()
defer s.writeMu.RUnlock()
return s.writeQueue
}
func (s *Session) CloseWriteQueue() {
s.writeMu.Lock()
defer s.writeMu.Unlock()
close(s.writeQueue)
s.writeQueue = nil
}
func (s *Session) Close() {
s.cancel()
}
|
