Finished basic connection initation

client/client.go

@@ -3,8 +3,9 @@ package client
 import (
 	"bufio"
 	"context"
+	"encoding/json"
 	"errors"
-	"golang.org/x/sync/errgroup"
+	"net"
 	"net/url"
 	"os"
 	"slices"
@@ -13,11 +14,18 @@ import (
 	"sync"
 	"time"
 
+	"golang.org/x/sync/errgroup"
+
 	"github.com/charmbracelet/log"
 	"github.com/gorilla/websocket"
+	"krzyzanowski.dev/archat/common"
 	cm "krzyzanowski.dev/archat/common"
 )
 
+type InitiationInfo struct {
+	otherSideNick string
+}
+
 type Context struct {
 	conn *websocket.Conn
 	// Assumption: size of 1 is enough, because first response read will be response for the last request
@@ -25,7 +33,7 @@ type Context struct {
 	resFromServer   chan cm.RFrame
 	reqFromServer   chan cm.RFrame
 	rToServer       chan cm.RFrame
-	initiations     []*cm.Initiation
+	initiations     []InitiationInfo
 	initiationsLock sync.RWMutex
 }
 
@@ -58,6 +66,8 @@ handleNext:
 				res, err = cliCtx.handleStartChatB(reqFrame)
 			} else if reqFrame.ID == cm.StartChatDReqID {
 				res, err = cliCtx.handleStartChatD(reqFrame)
+			} else if reqFrame.ID == cm.StartChatFinishReqID {
+				res, err = cliCtx.handleChatStartFinish(reqFrame)
 			} else {
 				logger.Warn("can't handle it!")
 			}
@@ -103,10 +113,8 @@ func (cliCtx *Context) handleStartChatB(reqFrame cm.RFrame) (res cm.Response, er
 		"decide if you want to accept the chat", startChatBReq.Nickname)
 
 	cliCtx.initiationsLock.Lock()
-	cliCtx.initiations = append(cliCtx.initiations, &cm.Initiation{
-		AbANick: startChatBReq.Nickname,
-		AbBNick: "",
-		Stage:   cm.InitiationStageB,
+	cliCtx.initiations = append(cliCtx.initiations, InitiationInfo{
+		otherSideNick: startChatBReq.Nickname,
 	})
 	cliCtx.initiationsLock.Unlock()
 
@@ -126,16 +134,45 @@ func (cliCtx *Context) handleStartChatD(reqFrame cm.RFrame) (res cm.Response, er
 		startChatDReq.Nickname, startChatDReq.PunchCode)
 	logger.Warn("handleStartChatD not implemented yet")
 
-	idx := slices.IndexFunc(cliCtx.initiations, func(i *cm.Initiation) bool {
-		return i.AbBNick == startChatDReq.Nickname
+	idx := slices.IndexFunc(cliCtx.initiations, func(i InitiationInfo) bool {
+		return i.otherSideNick == startChatDReq.Nickname
 	})
 
 	if idx == -1 {
-		logger.Error("there is no initation related to chatstartd's nickname, ignoring")
+		logger.Error("there is no initation related to chatstartd's nickname, ignoring",
+			"nickname", startChatDReq.Nickname)
 		return nil, nil
 	}
 
-	cliCtx.initiations[idx].Stage = cm.InitiationStageD
+	conn, err := net.Dial("udp", ":8081")
+	if err != nil {
+		logger.Error("error udp dialing for punch", err)
+		return nil, nil
+	}
+
+	enc := json.NewEncoder(conn)
+	err = enc.Encode(cm.PunchRequest{PunchCode: startChatDReq.PunchCode})
+
+	if err != nil {
+		logger.Error("error sending punch request data", "err", err)
+		return nil, nil
+	}
+
+	logger.Debug("punch request sent!")
+
+	return nil, nil
+}
+
+func (ctx *Context) handleChatStartFinish(reqFrame common.RFrame) (res common.Response, err error) {
+	startChatFinishReq, err := common.RequestFromFrame[common.StartChatFinishRequest](reqFrame)
+
+	if err != nil {
+		return nil, err
+	}
+
+	logger.Info("got chat finish info!",
+		"nick", startChatFinishReq.OtherSideNickname,
+		"addr", startChatFinishReq.OtherSideAddress)
 
 	return nil, nil
 }
@@ -288,8 +325,8 @@ func sendStartChatC(ctx *Context, nick string) {
 	ctx.initiationsLock.Lock()
 	defer ctx.initiationsLock.Unlock()
 
-	idx := slices.IndexFunc(ctx.initiations, func(i *cm.Initiation) bool {
-		return i.AbANick == nick
+	idx := slices.IndexFunc(ctx.initiations, func(i InitiationInfo) bool {
+		return i.otherSideNick == nick
 	})
 
 	if idx == -1 {
@@ -304,8 +341,6 @@ func sendStartChatC(ctx *Context, nick string) {
 		return
 	}
 
-	ctx.initiations[idx].Stage = cm.InitiationStageC
-
 	logger.Debug("request sent, no wait for response")
 }
 
@@ -399,12 +434,18 @@ func RunClient() {
 				}
 
 				sendStartChatA(cliCtx, cmdArgs[0])
+
+				cliCtx.initiationsLock.Lock()
+				cliCtx.initiations = append(cliCtx.initiations, InitiationInfo{
+					otherSideNick: cmdArgs[0],
+				})
+				cliCtx.initiationsLock.Unlock()
 			} else if cmdName == "initations" {
 				logger.Info("displaying all initations...")
 
 				cliCtx.initiationsLock.RLock()
 				for _, i := range cliCtx.initiations {
-					logger.Debugf("from %s, stage: %d", i.AbANick, i.Stage)
+					logger.Debugf("with %s", i.otherSideNick)
 				}
 				cliCtx.initiationsLock.RUnlock()
 			} else if cmdName == "startchatc" {

common/common.go

@@ -17,6 +17,7 @@ const (
 	StartChatBReqID      = 5
 	StartChatCReqID      = 6
 	StartChatDReqID      = 7
+	StartChatFinishReqID = 8
 )
 
 // Requests & responses subtypes
@@ -181,12 +182,23 @@ func (StartChatDRequest) ID() int {
 	return StartChatDReqID
 }
 
+type StartChatFinishRequest struct {
+	OtherSideNickname string `json:"otherSideNickname"`
+	OtherSideAddress  string `json:"otherSideAddress"`
+}
+
+func (StartChatFinishRequest) ID() int {
+	return StartChatFinishReqID
+}
+
 type Initiation struct {
 	AbANick      string
 	AbBNick      string
 	Stage        int
 	AbAPunchCode string
 	AbBPunchCode string
+	AbAAddress   string
+	AbBAddress   string
 }
 
 const (
@@ -195,3 +207,11 @@ const (
 	InitiationStageC = 3
 	InitiationStageD = 4
 )
+
+type PunchRequest struct {
+	PunchCode string `json:"punchCode"`
+}
+
+type PunchResponse struct {
+	IPAddr int32 `json:"ipAddr"`
+}

server/server.go

@@ -5,6 +5,7 @@ import (
 	"crypto/rand"
 	"encoding/json"
 	"errors"
+	"net"
 	"net/http"
 	"os"
 	"slices"
@@ -614,6 +615,89 @@ func (ctx *Context) wsapiHandler(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func (srvCtx *Context) handleUDP(data []byte, addr net.Addr) {
+	var punchReq common.PunchRequest
+	err := json.Unmarshal(data, &punchReq)
+
+	if err != nil {
+		logger.Error("error unmarshalling punch request", "err", err)
+		return
+	}
+
+	logger.Debugf("got punch request %+v", punchReq)
+
+	srvCtx.initiationsLock.Lock()
+	defer srvCtx.initiationsLock.Unlock()
+
+	idx := slices.IndexFunc(srvCtx.initiations, func(i *common.Initiation) bool {
+		return i.AbAPunchCode == punchReq.PunchCode ||
+			i.AbBPunchCode == punchReq.PunchCode
+	})
+
+	if idx == -1 {
+		logger.Debugf("haven't found initiation for the request")
+		return
+	}
+
+	matchedInitation := srvCtx.initiations[idx]
+	logger.Debugf("matched initiation %+v", matchedInitation)
+
+	if matchedInitation.AbAPunchCode == punchReq.PunchCode {
+		matchedInitation.AbAAddress = addr.String()
+	} else {
+		matchedInitation.AbBAddress = addr.String()
+	}
+
+	if matchedInitation.AbAAddress == "" || matchedInitation.AbBAddress == "" {
+		// does not have two addresses can't do anything yet
+		return
+	}
+
+	logger.Debugf("finished completing initiation %+v", matchedInitation)
+	logger.Debug("now sending peers their addresses")
+
+	srvCtx.peersListLock.Lock()
+	defer srvCtx.peersListLock.Unlock()
+
+	abA, err := srvCtx.getCtxByNick(matchedInitation.AbANick)
+
+	if err != nil {
+		logger.Debug("could not finish punching, abA not found",
+			"err", err)
+		return
+	}
+
+	abB, err := srvCtx.getCtxByNick(matchedInitation.AbBNick)
+
+	if err != nil {
+		logger.Debug("could not finish punching, abB not found",
+			"err", err)
+		return
+	}
+
+	err = abA.sendRequest(common.StartChatFinishRequest{
+		OtherSideNickname: matchedInitation.AbBNick,
+		OtherSideAddress:  matchedInitation.AbBAddress,
+	})
+
+	if err != nil {
+		logger.Debug("could not send start chat finish request to abA, aborting",
+			"err", err)
+		return
+	}
+
+	err = abB.sendRequest(common.StartChatFinishRequest{
+		OtherSideNickname: matchedInitation.AbANick,
+		OtherSideAddress:  matchedInitation.AbAAddress,
+	})
+
+	if err != nil {
+		logger.Debug("could not send start chat finish request to abB, aborting",
+			"err", err)
+		return
+	}
+}
+
 func RunServer() {
 	srvCtx := NewContext()
 
@@ -625,10 +709,30 @@ func RunServer() {
 	}()
 
 	http.HandleFunc("/wsapi", srvCtx.wsapiHandler)
-	logger.Info("Starting server...")
+	logger.Info("Starting websocket server...")
+	go func() {
 		err := http.ListenAndServe(":8080", nil)
-
 		if err != nil {
 			logger.Error(err)
 		}
+	}()
+
+	logger.Info("Starting punching server...")
+	listener, err := net.ListenPacket("udp", ":8081")
+	if err != nil {
+		logger.Error("could not create listener for punching server", err)
+	}
+
+	for {
+		data := make([]byte, 65536)
+		n, punchAddr, err := listener.ReadFrom(data)
+		if err != nil {
+			logger.Error("error reading from punching server", err)
+			continue
+		}
+
+		data = data[:n]
+		logger.Debugf("got message: %+v", data)
+		srvCtx.handleUDP(data, punchAddr)
+	}
 }