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package main
// #include <stdlib.h>
// #include "salticidae/network.h"
// void onTerm(int sig, void *);
// void onReceiveHello(msg_t *, msgnetwork_conn_t *, void *);
// void onReceiveAck(msg_t *, msgnetwork_conn_t *, void *);
// bool connHandler(msgnetwork_conn_t *, bool, void *);
// void errorHandler(SalticidaeCError *, bool, void *);
import "C"
import (
"fmt"
"github.com/Determinant/salticidae-go"
"os"
"unsafe"
)
const (
MSG_OPCODE_HELLO salticidae.Opcode = iota
MSG_OPCODE_ACK
)
func msgHelloSerialize(name string, text string) salticidae.Msg {
serialized := salticidae.NewDataStream(true)
serialized.PutU32(salticidae.ToLittleEndianU32(uint32(len(name))))
serialized.PutData([]byte(name))
serialized.PutData([]byte(text))
return salticidae.NewMsgMovedFromByteArray(
MSG_OPCODE_HELLO, salticidae.NewByteArrayMovedFromDataStream(serialized, true), true)
}
func msgHelloUnserialize(msg salticidae.Msg) (name string, text string) {
p := msg.GetPayloadByMove()
succ := true
length := salticidae.FromLittleEndianU32(p.GetU32(&succ))
t := p.GetDataInPlace(int(length))
name = string(t.Get())
t.Release()
t = p.GetDataInPlace(p.Size())
text = string(t.Get())
t.Release()
return
}
func msgAckSerialize() salticidae.Msg {
return salticidae.NewMsgMovedFromByteArray(MSG_OPCODE_ACK, salticidae.NewByteArray(true), true)
}
func checkError(err *salticidae.Error) {
if err.GetCode() != 0 {
fmt.Printf("error during a sync call: %s\n", salticidae.StrError(err.GetCode()))
os.Exit(1)
}
}
type MyNet struct {
net salticidae.MsgNetwork
name string
peerCert salticidae.UInt256
cname *C.char
}
var (
alice, bob MyNet
ec salticidae.EventContext
)
//export onTerm
func onTerm(_ C.int, _ unsafe.Pointer) {
ec.Stop()
}
//export onReceiveHello
func onReceiveHello(_msg *C.struct_msg_t, _conn *C.struct_msgnetwork_conn_t, userdata unsafe.Pointer) {
msg := salticidae.MsgFromC(salticidae.CMsg(_msg))
conn := salticidae.MsgNetworkConnFromC(salticidae.CMsgNetworkConn(_conn))
net := conn.GetNet()
name, text := msgHelloUnserialize(msg)
myName := C.GoString((*C.char)(userdata))
fmt.Printf("[%s] %s says %s\n", myName, name, text)
ack := msgAckSerialize()
net.SendMsg(ack, conn)
}
//export onReceiveAck
func onReceiveAck(_ *C.struct_msg_t, _conn *C.struct_msgnetwork_conn_t, userdata unsafe.Pointer) {
myName := C.GoString((*C.char)(userdata))
fmt.Printf("[%s] the peer knows\n", myName)
}
//export connHandler
func connHandler(_conn *C.struct_msgnetwork_conn_t, connected C.bool, userdata unsafe.Pointer) C.bool {
conn := salticidae.MsgNetworkConnFromC(salticidae.CMsgNetworkConn(_conn))
net := conn.GetNet()
myName := C.GoString((*C.char)(userdata))
n := alice
if myName == "bob" {
n = bob
}
res := true
if connected {
certHash := conn.GetPeerCert().GetDer(true).GetHash(true)
res = certHash.IsEq(n.peerCert)
if conn.GetMode() == salticidae.CONN_MODE_ACTIVE {
fmt.Printf("[%s] connected, sending hello.\n", myName)
hello := msgHelloSerialize(myName, "Hello there!")
n.net.SendMsg(hello, conn)
} else {
status := "fail"
if res {
status = "ok"
}
fmt.Printf("[%s] accepted, waiting for greetings.\n"+
"The peer certificate fingerprint is %s (%s)\n",
myName, certHash.GetHex(), status)
}
} else {
fmt.Printf("[%s] disconnected, retrying.\n", myName)
net.Connect(conn.GetAddr())
}
return C.bool(res)
}
//export errorHandler
func errorHandler(_err *C.struct_SalticidaeCError, fatal C.bool, _ unsafe.Pointer) {
err := (*salticidae.Error)(unsafe.Pointer(_err))
s := "recoverable"
if fatal {
s = "fatal"
}
fmt.Printf("Captured %s error during an async call: %s\n", s, salticidae.StrError(err.GetCode()))
}
func genMyNet(ec salticidae.EventContext,
name string, peerCert string,
myAddr salticidae.NetAddr, otherAddr salticidae.NetAddr) MyNet {
err := salticidae.NewError()
netconfig := salticidae.NewMsgNetworkConfig()
netconfig.EnableTLS(true)
netconfig.TLSKeyFile(name + ".pem")
netconfig.TLSCertFile(name + ".pem")
net := salticidae.NewMsgNetwork(ec, netconfig, &err)
checkError(&err)
_peerCert := salticidae.NewUInt256FromByteArray(salticidae.NewByteArrayFromHex(peerCert))
n := MyNet{net: net, name: name, peerCert: _peerCert, cname: C.CString(name)}
cname := unsafe.Pointer(n.cname)
n.net.RegHandler(MSG_OPCODE_HELLO, salticidae.MsgNetworkMsgCallback(C.onReceiveHello), cname)
n.net.RegHandler(MSG_OPCODE_ACK, salticidae.MsgNetworkMsgCallback(C.onReceiveAck), cname)
n.net.RegConnHandler(salticidae.MsgNetworkConnCallback(C.connHandler), cname)
n.net.RegErrorHandler(salticidae.MsgNetworkErrorCallback(C.errorHandler), cname)
n.net.Start()
n.net.Listen(myAddr, &err)
checkError(&err)
n.net.Connect(otherAddr)
return n
}
func main() {
ec = salticidae.NewEventContext()
err := salticidae.NewError()
aliceAddr := salticidae.NewNetAddrFromIPPortString("127.0.0.1:12345", true, &err)
bobAddr := salticidae.NewNetAddrFromIPPortString("127.0.0.1:12346", true, &err)
alice = genMyNet(ec, "alice", "ed5a9a8c7429dcb235a88244bc69d43d16b35008ce49736b27aaa3042a674043", aliceAddr, bobAddr)
bob = genMyNet(ec, "bob", "ef3bea4e72f4d0e85da7643545312e2ff6dded5e176560bdffb1e53b1cef4896", bobAddr, aliceAddr)
ev_int := salticidae.NewSigEvent(ec, salticidae.SigEventCallback(C.onTerm), nil)
ev_int.Add(salticidae.SIGINT)
ev_term := salticidae.NewSigEvent(ec, salticidae.SigEventCallback(C.onTerm), nil)
ev_term.Add(salticidae.SIGTERM)
ec.Dispatch()
alice.net.Stop()
bob.net.Stop()
C.free(unsafe.Pointer(alice.cname))
C.free(unsafe.Pointer(bob.cname))
}
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