coolaj86/chat.go
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GEFN (good enough for now)

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AJ ONeal 2018-08-02 02:52:55 -06:00
förälder 2b88da7a71
incheckning 3943c14845
3 ändrade filer med 51 tillägg och 72 borttagningar
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25
chatserver-http.go
Visa fil

@ -13,6 +13,10 @@ import (
restful "github.com/emicklei/go-restful"
)
type JsonMsg struct {
Messages []*chatMsg `json:"messages"`
}
type myHttpServer struct {
chans chan bufferedConn
net.Listener
@ -43,10 +47,7 @@ type authReq struct {
func serveStatic(req *restful.Request, resp *restful.Response) {
actual := path.Join(config.RootPath, req.PathParameter("subpath"))
fmt.Printf("serving %s ... (from %s)\n", actual, req.PathParameter("subpath"))
http.ServeFile(
resp.ResponseWriter,
req.Request,
actual)
http.ServeFile(resp.ResponseWriter, req.Request, actual)
}
func serveHello(req *restful.Request, resp *restful.Response) {
@ -93,7 +94,7 @@ func requestAuth(req *restful.Request, resp *restful.Response) {
}
ar.Otp = otp
// Cheat code in case you didn't set up mailgun keys
// Cheat code in case you didn't set up mailgun keys in the config file
fmt.Fprintf(os.Stdout, "\n== HTTP AUTHORIZATION ==\n[cheat code for %s]: %s\n", ar.Subject, ar.Otp)
cid, _ := genAuthCode()
@ -102,10 +103,8 @@ func requestAuth(req *restful.Request, resp *restful.Response) {
}
ar.Cid = cid
newAuthReqs <- ar
authReqs <- ar
// Not sure why this works... technically there needs to be some sort of "end"
// maybe it just figures that if I've returned
fmt.Fprintf(resp, "{ \"success\": true, \"cid\": \""+ar.Cid+"\" }")
}
@ -118,7 +117,6 @@ func issueToken(req *restful.Request, resp *restful.Response) {
return
}
//err := json.NewDecoder(r.Body).Decode(&ar)
err := req.ReadEntity(&ar)
if nil != err {
fmt.Fprintf(resp, "{ \"error\": { \"message\": \"bad json in request body\"} }")
@ -152,12 +150,12 @@ func issueToken(req *restful.Request, resp *restful.Response) {
// to overwrite the original with the updated
// (these are copies, not pointers, IIRC)
// and it seems like this is how I might write to a DB anyway
newAuthReqs <- av
authReqs <- av
return
}
av.DidAuth = true
ar.VerifiedAt = time.Now()
newAuthReqs <- av
authReqs <- av
// TODO I would use a JWT, but I need to wrap up this project
fmt.Fprintf(resp, "{ \"success\": true, \"token\": \""+ar.Cid+"\" }")
@ -201,9 +199,8 @@ func requireToken(req *restful.Request, resp *restful.Response, chain *restful.F
}
func listMsgs(req *restful.Request, resp *restful.Response) {
// TODO support ?since=<ISO_TS>
// Also, data race? the list could be added to while this is iterating?
// For now we'll just let the client sort the list
// TODO support ?since=<ISO_TS>, but for now we'll just let the client sort the list
// TODO Could this have a data race if the list were added to while this is iterating?
resp.WriteEntity(&JsonMsg{
Messages: myChatHist.msgs[:myChatHist.c],
})

17
chatserver-telnet.go
Visa fil

@ -9,6 +9,13 @@ import (
"time"
)
type telnetUser struct {
bufConn bufferedConn
userCount chan int
email string
newMsg chan string
}
// Trying to keep it slim with just one goroutine per client for each reads and writes.
// Initially I was spawning a goroutine per write in the main select, but my guess is that
// constantly allocating and cleaning up 4k of memory (or perhaps less these days
@ -26,7 +33,7 @@ func handleTelnetConn(bufConn bufferedConn) {
// Handle all subsequent packets
buffer := make([]byte, 1024)
var u *tcpUser
var u *telnetUser
for {
//fmt.Fprintf(os.Stdout, "[raw] Waiting for message...\n")
count, err := bufConn.Read(buffer)
@ -136,7 +143,7 @@ func handleTelnetConn(bufConn bufferedConn) {
authn = true
time.Sleep(150 * time.Millisecond)
fmt.Fprintf(bufConn, "\n")
u = &tcpUser{
u = &telnetUser{
bufConn: bufConn,
email: email,
userCount: make(chan int, 1),
@ -156,6 +163,7 @@ func handleTelnetConn(bufConn bufferedConn) {
time.Sleep(50 * time.Millisecond)
fmt.Fprintf(bufConn, "\n")
time.Sleep(50 * time.Millisecond)
// It turns out that ANSI characters work in Telnet just fine
fmt.Fprintf(bufConn, "\033[1;32m"+"Welcome to #general (%d users)!"+"\033[22;39m", count)
time.Sleep(50 * time.Millisecond)
fmt.Fprintf(bufConn, "\n")
@ -166,7 +174,8 @@ func handleTelnetConn(bufConn bufferedConn) {
fmt.Fprintf(bufConn, "\n")
// Would be cool to write a prompt...
// I wonder if I could send the correct ANSI codes for that...
// I wonder if I could send fudge some ANSI codes to keep the prompt
// even when new messages come in, but not overwrite what he user typed...
//fmt.Fprintf(bufConn, "\n%s> ", email)
go handleTelnetBroadcast(u)
@ -185,7 +194,7 @@ func handleTelnetConn(bufConn bufferedConn) {
}
// Writes (post Auth)
func handleTelnetBroadcast(u *tcpUser) {
func handleTelnetBroadcast(u *telnetUser) {
for {
msg, more := <-u.newMsg
if !more {

81
chatserver.go
Visa fil

@ -39,13 +39,6 @@ type ConfMailer struct {
From string `yaml:"from,omitempty"`
}
type tcpUser struct {
bufConn bufferedConn
userCount chan int
email string
newMsg chan string
}
// So we can peek at net.Conn, which we can't do natively
// https://stackoverflow.com/questions/51472020/how-to-get-the-size-of-available-tcp-data
type bufferedConn struct {
@ -80,28 +73,29 @@ type chatMsg struct {
Channel string `json:"channel"`
User string `json:"user"`
}
type JsonMsg struct {
Messages []*chatMsg `json:"messages"`
}
// Poor-Man's container/ring (circular buffer)
type chatHist struct {
msgs []*chatMsg
i int
c int
i int // current index
c int // current count (number of elements)
}
// Multi-use
var config Conf
var virginConns chan net.Conn
var gotClientHello chan bufferedConn
var myChatHist chatHist
var broadcastMsg chan chatMsg
var virginConns chan net.Conn
// Telnet
var wantsServerHello chan bufferedConn
var authTelnet chan tcpUser
var cleanTelnet chan tcpUser
var gotClientHello chan bufferedConn
var authTelnet chan telnetUser
var cleanTelnet chan telnetUser
// HTTP
var demuxHttpClient chan bufferedConn
var newAuthReqs chan authReq
var authChallenge chan authReq
var valAuthReqs chan authReq
var delAuthReqs chan authReq
@ -184,7 +178,7 @@ func muxTcp(conn bufferedConn) {
demuxHttpClient <- conn
}
func handleConnection(netConn net.Conn) {
func testForHello(netConn net.Conn) {
ts := time.Now()
fmt.Fprintf(os.Stdout, "[New Connection] (%s) welcome %s\n", ts, netConn.RemoteAddr().String())
@ -193,13 +187,11 @@ func handleConnection(netConn net.Conn) {
bufConn := newBufferedConn(netConn)
go func() {
// Handle First Packet
// Cause first packet to be loaded into buffer
_, err := bufConn.Peek(1)
//fmsg, err := bufConn.Peek(1)
if nil != err {
panic(err)
}
//fmt.Fprintf(os.Stdout, "[First Byte] %s\n", fmsg)
m.Lock()
if virgin {
@ -211,14 +203,17 @@ func handleConnection(netConn net.Conn) {
m.Unlock()
}()
// Wait for a hello packet of some sort from the client
// (obviously this wouldn't work in extremely high latency situations)
time.Sleep(250 * 1000000)
// If we still haven't received data from the client
// assume that the client must be expecting a welcome from us
m.Lock()
if virgin {
virgin = false
// don't block for this
// let it be handled after the unlock
// Defer as to not block and prolonging the mutex
// (not that those few cycles much matter...)
defer fmt.Fprintf(netConn,
"\n\nWelcome to Sample Chat! You appear to be using Telnet (http is also available on this port)."+
"\nYou must authenticate via email to participate\n\nEmail: ")
@ -251,7 +246,7 @@ func sendAuthCode(cnf ConfMailer, to string) (string, error) {
if nil != err {
return "", err
}
//req.PostForm = form
//req.PostForm = form ??
req.Header.Add("User-Agent", "golang http.Client - Sample Chat App Authenticator")
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
req.SetBasicAuth("api", cnf.ApiKey)
@ -276,8 +271,6 @@ func sendAuthCode(cnf ConfMailer, to string) (string, error) {
return code, nil
}
var config Conf
func main() {
flag.Usage = usage
port := flag.Uint("port", 0, "tcp telnet chat port")
@ -295,7 +288,8 @@ func main() {
config = Conf{}
}
if "" == config.RootPath {
// TODO Embed the public dir at the default
// TODO Maybe embed the public dir into the binary
// (and provide a flag with path for override - like gitea)
config.RootPath = "./public"
}
@ -303,28 +297,24 @@ func main() {
virginConns = make(chan net.Conn, 128)
// TCP & Authentication
telnetConns := make(map[bufferedConn]tcpUser)
telnetConns := make(map[bufferedConn]telnetUser)
wantsServerHello = make(chan bufferedConn, 128)
authTelnet = make(chan tcpUser, 128)
authTelnet = make(chan telnetUser, 128)
// HTTP & Authentication
myAuthReqs := make(map[string]authReq)
newAuthReqs = make(chan authReq, 128)
authReqs = make(chan authReq, 128)
valAuthReqs = make(chan authReq, 128)
delAuthReqs = make(chan authReq, 128)
gotClientHello = make(chan bufferedConn, 128)
demuxHttpClient = make(chan bufferedConn, 128)
// cruft to delete
//myRooms = make(map[string](chan chatMsg))
//myRooms["general"] = make(chan chatMsg, 128)
// Note: I had considered dynamically select on channels for rooms.
// https://stackoverflow.com/questions/19992334/how-to-listen-to-n-channels-dynamic-select-statement
// I don't think that's actually the best approach, but I just wanted to save the link
broadcastMsg = make(chan chatMsg, 128)
// Poor-Man's container/ring (circular buffer)
myChatHist.msgs = make([]*chatMsg, 128)
var addr string
@ -391,7 +381,7 @@ func main() {
select {
case conn := <-virginConns:
// This is short lived
go handleConnection(conn)
go testForHello(conn)
case u := <-authTelnet:
// allow to receive messages
// (and be counted among the users)
@ -405,7 +395,7 @@ func main() {
Channel: "general",
User: "system",
}
case ar := <-newAuthReqs:
case ar := <-authReqs:
myAuthReqs[ar.Cid] = ar
case ar := <-valAuthReqs:
// TODO In this case it's probably more conventional (and efficient) to
@ -455,7 +445,7 @@ func main() {
sender = "system"
}
// Tangential thought:
// I wonder if we could use IP detection to get the client's tz
// I wonder if we could use IP detection to get a Telnet client's tz
// ... could probably make time for this in the authentication loop
zone, _ := msg.ReceivedAt.Zone()
fmt.Fprintf(os.Stdout, tf+" [%s] (%s): %s\r\n",
@ -484,23 +474,6 @@ func main() {
// It can reconnect.
cleanTelnet <- u
}
/*
// To ask: Why do I have to pass in conn to prevent a data race? Is it garbage collection?
// Don't block the rest of the loop
// TODONE maybe use a chan to send to the socket's event loop
// (left this in to remind myself to ask questions)
go func(conn bufferedConn) {
// Protect against malicious clients to prevent DoS
// https://blog.cloudflare.com/the-complete-guide-to-golang-net-http-timeouts/
timeoutDuration := 2 * time.Second
conn.SetWriteDeadline(time.Now().Add(timeoutDuration))
_, err := fmt.Fprintf(conn, msg)
if nil != err {
cleanTelnet <- u
}
}(conn)
*/
}
}
}