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feat: connection engine
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,15 @@ | ||
| name: Lint | ||
| on: [push, pull_request] | ||
| jobs: | ||
| golangci: | ||
| name: lint | ||
| runs-on: ubuntu-latest | ||
| steps: | ||
| - uses: actions/setup-go@v3 | ||
| with: | ||
| go-version: 1.18 | ||
| - uses: actions/checkout@v3 | ||
| - name: golangci-lint | ||
| uses: golangci/golangci-lint-action@v3 | ||
| with: | ||
| version: v1.48 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| on: [push, pull_request] | ||
| name: Tests | ||
| jobs: | ||
| test: | ||
| runs-on: ubuntu-latest | ||
| steps: | ||
| - name: Install Go. | ||
| uses: actions/setup-go@v2 | ||
| with: | ||
| go-version: 1.18 | ||
| - name: Checkout code. | ||
| uses: actions/checkout@v2 | ||
| - name: Run tests. | ||
| run: go test -v ./... |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "flag" | ||
| "fmt" | ||
| "log" | ||
| "net/url" | ||
| "os" | ||
|
|
||
| "github.com/fatih/color" | ||
| "github.com/gorilla/websocket" | ||
| ) | ||
|
|
||
| type ConnReader interface { | ||
| ReadJSON(v interface{}) error | ||
| } | ||
|
|
||
| type ConnWriter interface { | ||
| WriteJSON(v interface{}) error | ||
| Close() error | ||
| } | ||
|
|
||
| type Scanner interface { | ||
| Scan() bool | ||
| Text() string | ||
| } | ||
|
|
||
| type message struct { | ||
| Username string `json:"username"` | ||
| Text string `json:"text"` | ||
| Type string `json:"type"` | ||
| } | ||
|
|
||
| func main() { | ||
| var name string | ||
| var s *bufio.Scanner | ||
|
|
||
| // Parse flags. | ||
| server := flag.String("server", "localhost:9000", "Server network address") | ||
| path := flag.String("path", "/", "Server path") | ||
| flag.Parse() | ||
|
|
||
| // Construct WebSocket URL. | ||
| u := url.URL{Scheme: "ws", Host: *server, Path: *path} | ||
|
|
||
| // Read username. | ||
| fmt.Printf("%s", color.YellowString("Enter your Name: ")) | ||
| s = bufio.NewScanner(os.Stdin) | ||
| s.Scan() | ||
| name = s.Text() | ||
|
|
||
| // Display welcome message. | ||
| color.Green("\nWelcome %s!\n", name) | ||
| color.Green("Connecting to server @ %s\n", *server) | ||
| color.Yellow("Send a message, or type !q to exit.\n") | ||
|
|
||
| // Get WebSocket connection. | ||
| conn, _, err := websocket.DefaultDialer.Dial(u.String(), nil) | ||
| if err != nil { | ||
| color.Red("Connection error, exiting: %s", err) | ||
| os.Exit(0) | ||
| } | ||
| defer conn.Close() | ||
|
|
||
| // Send joining message. | ||
| msg := message{Username: name, Text: "has joined the chat.", Type: "info"} | ||
| _ = conn.WriteJSON(msg) | ||
|
|
||
| go readMessages(conn) // Handle incoming messages concurrently. | ||
| writeMessages(conn, s, name) // Handle outgoing messages concurrently. | ||
| } | ||
|
|
||
| // readMessages handles incoming messages on the WebSocket connection. | ||
| func readMessages(conn ConnReader) { | ||
| for { | ||
| var msg message | ||
|
|
||
| // Read message. | ||
| err := conn.ReadJSON(&msg) | ||
| if err != nil { | ||
| color.Red("Server closed. Exiting...") | ||
| os.Exit(0) | ||
| } | ||
|
|
||
| // Display message. | ||
| color.Magenta("%s: %s\n", msg.Username, msg.Text) | ||
| } | ||
| } | ||
|
|
||
| // writeMessages scans stdin and sends each scanned line to the server as JSON. | ||
| func writeMessages(conn ConnWriter, s Scanner, name string) { | ||
| var msg message | ||
| msg.Username = name | ||
|
|
||
| for { | ||
| fmt.Print("> ") | ||
| if s.Scan() { | ||
| fmt.Printf("\033[A") | ||
| msg.Text = s.Text() | ||
|
|
||
| // Handle quit event. | ||
| if msg.Text == "!q" { | ||
| fmt.Println("Goodbye!") | ||
| _ = conn.WriteJSON(message{Username: name, Text: "has disconnected.", Type: "info"}) | ||
| conn.Close() | ||
| os.Exit(0) | ||
| } | ||
|
|
||
| // Display message. | ||
| if msg.Type != "" { | ||
| color.Cyan("%s %s\n", msg.Username, msg.Text) | ||
| } else { | ||
| color.Cyan("%s: %s\n", msg.Username, msg.Text) | ||
| } | ||
|
|
||
| // Write message to connection. | ||
| err := conn.WriteJSON(msg) | ||
| if err != nil { | ||
| log.Fatal("Error sending message, exiting") | ||
| } | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "flag" | ||
| "log" | ||
| "net/http" | ||
| "time" | ||
|
|
||
| "github.com/fatih/color" | ||
| "github.com/google/uuid" | ||
| "github.com/gorilla/websocket" | ||
| ) | ||
|
|
||
| type message struct { | ||
| Username string `json:"username"` | ||
| Text string `json:"text"` | ||
| Type string `json:"type"` | ||
| ID uuid.UUID | ||
| } | ||
|
|
||
| // Upgrader instance to upgrade all HTTP connections to a WebSocket. | ||
| var upgrader = websocket.Upgrader{} | ||
|
|
||
| // Map to store currently active client connections. | ||
| var activeClients = make(map[*websocket.Conn]uuid.UUID) | ||
|
|
||
| // Channel for client messages. | ||
| var messageChan = make(chan message) | ||
|
|
||
| func main() { | ||
| // Parse flags. | ||
| addr := flag.String("addr", ":9000", "Server's network address") | ||
| flag.Parse() | ||
|
|
||
| mux := http.NewServeMux() | ||
| mux.HandleFunc("/", handleConn) | ||
|
|
||
| // Handle incoming messages. | ||
| go handleMsg() | ||
|
|
||
| // Start the server. | ||
| log.Printf("Starting server on %s", *addr) | ||
| err := http.ListenAndServe(*addr, mux) | ||
| if err != nil { | ||
| log.Fatal("Error starting server, exiting.", err) | ||
| } | ||
| } | ||
|
|
||
| // handleConn handles incoming HTTP connections by adding the connection to activeClients and reads messages from the connection. | ||
| func handleConn(w http.ResponseWriter, r *http.Request) { | ||
| // Upgrade incoming HTTP connections to WebSocket connections | ||
| conn, err := upgrader.Upgrade(w, r, nil) | ||
| if err != nil { | ||
| log.Printf("Error upgrading connection to websocket: %v", err) | ||
| } | ||
| defer conn.Close() | ||
|
|
||
| // Generate a UUID for the client. | ||
| activeClients[conn] = uuid.New() | ||
|
|
||
| for { | ||
| var msg message | ||
|
|
||
| // Read message from the connection. | ||
| err := conn.ReadJSON(&msg) | ||
| if err != nil { | ||
| log.Printf("Closing connection with ID: %v", activeClients[conn]) | ||
| delete(activeClients, conn) | ||
| break | ||
| } | ||
|
|
||
| // Set message ID | ||
| msg.ID = activeClients[conn] | ||
|
|
||
| // Send message to messageChan. | ||
| messageChan <- msg | ||
| } | ||
| } | ||
|
|
||
| // handleMsg listens to the messageChan channel and broadcasts messages to other clients. | ||
| func handleMsg() { | ||
| for { | ||
| // Get message from messageChan. | ||
| msg := <-messageChan | ||
|
|
||
| // Log each message to stdout. | ||
| t := time.Now().Format(time.ANSIC) | ||
| if msg.Type != "" { | ||
| color.Green("%s >> %s %s\n", t, msg.Username, msg.Text) | ||
| } else { | ||
| color.Green("%s >> %s: %s\n", t, msg.Username, msg.Text) | ||
| } | ||
|
|
||
| // Broadcast to all active clients. | ||
| for client, UUID := range activeClients { | ||
| // Check the UUID to prevent sending messages to their origin. | ||
| if msg.ID != UUID { | ||
| // Write JSON message. | ||
| err := client.WriteJSON(msg) | ||
| if err != nil { | ||
| log.Printf("Error sending message to client: %v", err) | ||
| client.Close() | ||
| delete(activeClients, client) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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