134 lines
2.6 KiB
Go
134 lines
2.6 KiB
Go
package main
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import (
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"fmt"
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"io"
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"net"
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"strings"
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"sync"
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"time"
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)
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type RemoteGrainPool struct {
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mu sync.RWMutex
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Host string
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grains map[CartId]RemoteGrain
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}
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func (id CartId) String() string {
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return strings.Trim(string(id[:]), "\x00")
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}
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func ToCartId(id string) CartId {
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var result [16]byte
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copy(result[:], []byte(id))
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return result
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}
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type RemoteGrain struct {
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connection net.Conn
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queue *PacketQueue
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Id CartId
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Address string
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}
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func NewRemoteGrain(id CartId, address string) *RemoteGrain {
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return &RemoteGrain{
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Id: id,
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Address: address,
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}
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}
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func (g *RemoteGrain) Connect() error {
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if g.connection == nil {
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client, err := net.Dial("tcp", g.Address)
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if err != nil {
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return err
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}
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g.connection = client
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g.queue = NewPacketQueue(client)
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}
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return nil
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}
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func (g *RemoteGrain) HandleMessage(message *Message, isReplay bool) ([]byte, error) {
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err := SendCartPacket(g.connection, g.Id, RemoteHandleMessage, message.Write)
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if err != nil {
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return nil, err
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}
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packet, err := g.queue.Expect(ResponseBody, time.Second)
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if err != nil {
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return nil, err
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}
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return packet.Data, err
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}
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func (g *RemoteGrain) GetId() CartId {
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return g.Id
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}
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func (g *RemoteGrain) GetCurrentState() ([]byte, error) {
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err := SendCartPacket(g.connection, g.Id, RemoteGetState, func(w io.Writer) error {
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return nil
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})
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if err != nil {
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return nil, err
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}
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packet, err := g.queue.Expect(ResponseBody, time.Second)
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if err != nil {
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return nil, err
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}
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return packet.Data, nil
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}
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func NewRemoteGrainPool(addr string) *RemoteGrainPool {
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return &RemoteGrainPool{
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Host: addr,
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grains: make(map[CartId]RemoteGrain),
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}
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}
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func (p *RemoteGrainPool) findRemoteGrain(id CartId) *RemoteGrain {
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p.mu.RLock()
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grain, ok := p.grains[id]
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p.mu.RUnlock()
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if !ok {
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return nil
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}
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grain.Connect()
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return &grain
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}
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func (p *RemoteGrainPool) findOrCreateGrain(id CartId) *RemoteGrain {
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grain := p.findRemoteGrain(id)
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if grain == nil {
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grain = NewRemoteGrain(id, p.Host)
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p.mu.Lock()
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p.grains[id] = *grain
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p.mu.Unlock()
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grain.Connect()
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}
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return grain
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}
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func (p *RemoteGrainPool) Process(id CartId, messages ...Message) ([]byte, error) {
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var result []byte
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var err error
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grain := p.findOrCreateGrain(id)
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if grain == nil {
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return nil, fmt.Errorf("grain not found")
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}
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for _, message := range messages {
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result, err = grain.HandleMessage(&message, false)
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}
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return result, err
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}
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func (p *RemoteGrainPool) Get(id CartId) ([]byte, error) {
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grain := p.findOrCreateGrain(id)
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if grain == nil {
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return nil, fmt.Errorf("grain not found")
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}
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return grain.GetCurrentState()
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}
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