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node.go
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node.go
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package node
import (
"crypto/rand"
"errors"
"reflect"
"github.com/h2so5/murcott/log"
"github.com/h2so5/murcott/router"
"github.com/h2so5/murcott/utils"
"github.com/vmihailenco/msgpack"
)
type msgpair struct {
id utils.NodeID
msg interface{}
}
type msghandler struct {
id string
callback func(interface{})
}
type Node struct {
router *router.Router
handler func(utils.NodeID, interface{}) interface{}
idmap map[string]func(interface{})
name2type map[string]reflect.Type
type2name map[reflect.Type]string
register chan msghandler
cancelHandler chan string
cancelMessage chan int
config utils.Config
logger *log.Logger
exit chan struct{}
}
func NewNode(key *utils.PrivateKey, logger *log.Logger, config utils.Config) (*Node, error) {
router, err := router.NewRouter(key, logger, config)
if err != nil {
return nil, err
}
n := &Node{
router: router,
idmap: make(map[string]func(interface{})),
name2type: make(map[string]reflect.Type),
type2name: make(map[reflect.Type]string),
register: make(chan msghandler, 2),
cancelHandler: make(chan string),
cancelMessage: make(chan int),
config: config,
logger: logger,
exit: make(chan struct{}),
}
return n, nil
}
func (p *Node) Run() {
msg := make(chan router.Message)
// Discover bootstrap nodes
p.router.Discover(p.config.Bootstrap())
go func() {
for {
m, err := p.router.RecvMessage()
if err != nil {
break
}
msg <- m
}
}()
for {
select {
case m := <-msg:
var t struct {
Type string `msgpack:"type"`
}
err := msgpack.Unmarshal(m.Payload, &t)
if err == nil {
p.parseMessage(t.Type, m.Payload, m.ID)
}
case h := <-p.register:
p.idmap[h.id] = h.callback
case id := <-p.cancelHandler:
if h, ok := p.idmap[id]; ok {
h(nil)
delete(p.idmap, id)
}
case <-p.exit:
return
}
}
}
func (p *Node) RegisterMessageType(name string, typ interface{}) {
t := reflect.TypeOf(typ)
p.name2type[name] = t
p.type2name[t] = name
}
func (p *Node) parseMessage(typ string, payload []byte, id utils.NodeID) {
if t, ok := p.name2type[typ]; ok {
p.parseCommand(payload, id, t)
} else {
p.logger.Error("Unknown message type: %s", typ)
}
}
func (p *Node) parseCommand(payload []byte, id utils.NodeID, typ reflect.Type) {
c := struct {
Content interface{} `msgpack:"content"`
ID string `msgpack:"id"`
}{}
v := reflect.New(typ)
c.Content = v.Interface()
if msgpack.Unmarshal(payload, &c) == nil {
if h, ok := p.idmap[c.ID]; ok {
h(reflect.Indirect(v).Interface())
delete(p.idmap, c.ID)
} else if p.handler != nil {
r := p.handler(id, reflect.Indirect(v).Interface())
if r != nil {
p.sendWithID(id, r, nil, c.ID)
}
}
}
}
func (p *Node) Send(dst utils.NodeID, msg interface{}, handler func(interface{})) error {
return p.sendWithID(dst, msg, handler, "")
}
func (p *Node) sendWithID(dst utils.NodeID, msg interface{}, handler func(interface{}), id string) error {
t := struct {
Type string `msgpack:"type"`
Content interface{} `msgpack:"content"`
ID string `msgpack:"id"`
}{Content: msg}
if len(id) != 0 {
t.ID = id
} else if handler != nil {
r := make([]byte, 10)
rand.Read(r)
t.ID = string(r)
p.register <- msghandler{t.ID, handler}
}
if n, ok := p.type2name[reflect.TypeOf(msg)]; ok {
t.Type = n
} else {
return errors.New("Unknown message type")
}
data, err := msgpack.Marshal(t)
if err != nil {
return err
}
p.router.SendMessage(dst, data)
return nil
}
func (p *Node) AddNode(info utils.NodeInfo) {
p.router.AddNode(info)
}
func (p *Node) KnownNodes() []utils.NodeInfo {
return p.router.KnownNodes()
}
func (p *Node) Handle(handler func(utils.NodeID, interface{}) interface{}) {
p.handler = handler
}
func (p *Node) Close() {
p.router.Close()
p.exit <- struct{}{}
}