commit edd379cfd1124f0a15634f3ea5bc03c554626534
Author: alex <alex@roese.dev>
Date:   Wed Dec 21 20:12:12 2022 +0100

    sse server

diff --git a/config.example.yml b/config.example.yml
new file mode 100644
index 0000000..8762bb4
--- /dev/null
+++ b/config.example.yml
@@ -0,0 +1,5 @@
+debug: false
+rabbitmq:
+  host: "127.0.0.1"
+  username: "guest"
+  password: "guest"
\ No newline at end of file
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..d59c33d
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,22 @@
+module clickandjoin.app/serversenteventsserver
+
+go 1.19
+
+require (
+	github.com/andybalholm/brotli v1.0.4 // indirect
+	github.com/gofiber/adaptor/v2 v2.1.30 // indirect
+	github.com/gofiber/fiber/v2 v2.40.1 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/klauspost/compress v1.15.9 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.16 // indirect
+	github.com/mattn/go-runewidth v0.0.14 // indirect
+	github.com/rabbitmq/amqp091-go v1.5.0 // indirect
+	github.com/rivo/uniseg v0.2.0 // indirect
+	github.com/sirupsen/logrus v1.9.0 // indirect
+	github.com/valyala/bytebufferpool v1.0.0 // indirect
+	github.com/valyala/fasthttp v1.41.0 // indirect
+	github.com/valyala/tcplisten v1.0.0 // indirect
+	golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..b96580d
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,81 @@
+github.com/andybalholm/brotli v1.0.4 h1:V7DdXeJtZscaqfNuAdSRuRFzuiKlHSC/Zh3zl9qY3JY=
+github.com/andybalholm/brotli v1.0.4/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/gofiber/adaptor/v2 v2.1.30 h1:ak5sCY8HbnafdMjvxUhS8wz5JWghwfxhnvig3/ACjVo=
+github.com/gofiber/adaptor/v2 v2.1.30/go.mod h1:20KxTjpAea1f+9mcMwManJWKvWl37YxW1yuNGoNoGS4=
+github.com/gofiber/fiber/v2 v2.40.1 h1:pc7n9VVpGIqNsvg9IPLQhyFEMJL8gCs1kneH5D1pIl4=
+github.com/gofiber/fiber/v2 v2.40.1/go.mod h1:Gko04sLksnHbzLSRBFWPFdzM9Ws9pRxvvIaohJK1dsk=
+github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
+github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/klauspost/compress v1.15.9 h1:wKRjX6JRtDdrE9qwa4b/Cip7ACOshUI4smpCQanqjSY=
+github.com/klauspost/compress v1.15.9/go.mod h1:PhcZ0MbTNciWF3rruxRgKxI5NkcHHrHUDtV4Yw2GlzU=
+github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
+github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
+github.com/mattn/go-isatty v0.0.16 h1:bq3VjFmv/sOjHtdEhmkEV4x1AJtvUvOJ2PFAZ5+peKQ=
+github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
+github.com/mattn/go-runewidth v0.0.14 h1:+xnbZSEeDbOIg5/mE6JF0w6n9duR1l3/WmbinWVwUuU=
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+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/rabbitmq/amqp091-go v1.5.0 h1:VouyHPBu1CrKyJVfteGknGOGCzmOz0zcv/tONLkb7rg=
+github.com/rabbitmq/amqp091-go v1.5.0/go.mod h1:JsV0ofX5f1nwOGafb8L5rBItt9GyhfQfcJj+oyz0dGg=
+github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
+github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
+github.com/sirupsen/logrus v1.9.0 h1:trlNQbNUG3OdDrDil03MCb1H2o9nJ1x4/5LYw7byDE0=
+github.com/sirupsen/logrus v1.9.0/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
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diff --git a/main.go b/main.go
new file mode 100644
index 0000000..3b6b05f
--- /dev/null
+++ b/main.go
@@ -0,0 +1,94 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"time"
+
+	"clickandjoin.app/serversenteventsserver/modules/cache"
+	"clickandjoin.app/serversenteventsserver/modules/config"
+	"clickandjoin.app/serversenteventsserver/modules/rabbitmq"
+	"clickandjoin.app/serversenteventsserver/modules/structs"
+	"github.com/gofiber/fiber/v2"
+	"github.com/gofiber/fiber/v2/middleware/cors"
+	"github.com/google/uuid"
+	"github.com/sirupsen/logrus"
+	"github.com/valyala/fasthttp"
+)
+
+func init() {
+	config.LoadConfig()
+
+	if config.Cfg.Debug {
+		logrus.SetLevel(logrus.DebugLevel)
+	}
+
+	logrus.Println("Debug:", config.Cfg.Debug)
+
+	go rabbitmq.Init()
+}
+
+func main() {
+	app := fiber.New()
+
+	// wait so that rabbitmq can connect
+	// TODO: better way to handle this
+	time.Sleep(500 * time.Millisecond)
+
+	if len(os.Args) < 2 {
+		logrus.Fatalln("Please specify port")
+	}
+
+	// TODO: origin
+	// CORS for external resources
+	app.Use(cors.New(cors.Config{
+		AllowOrigins:     "*",
+		AllowHeaders:     "Cache-Control",
+		AllowCredentials: true,
+	}))
+
+	app.Get("/sse", func(c *fiber.Ctx) error {
+		c.Set("Content-Type", "text/event-stream")
+		c.Set("Cache-Control", "no-cache")
+		c.Set("Connection", "keep-alive")
+		c.Set("Transfer-Encoding", "chunked")
+
+		c.Context().SetBodyStreamWriter(fasthttp.StreamWriter(func(w *bufio.Writer) {
+			var sseclient structs.SSEClient
+
+			sseclient.MessageChan = make(chan structs.SSEClientChanMessage)
+
+			clientId := uuid.New()
+
+			cache.SSEClients[clientId] = sseclient
+
+			logrus.Debugln("NEW CLIENT ID:", clientId)
+			logrus.Debugln(len(cache.SSEClients), "CLIENTS CONNECTED")
+
+			for message := range sseclient.MessageChan {
+				fmt.Fprintf(w, "data: %s\n\n", message.Message)
+
+				err := w.Flush()
+
+				if err != nil {
+					// Refreshing page in web browser will establish a new
+					// SSE connection, but only (the last) one is alive, so
+					// dead connections must be closed here.
+
+					for id, sseClient := range cache.SSEClients {
+						if id == message.ClientId {
+							close(sseClient.MessageChan)
+							delete(cache.SSEClients, id)
+							logrus.Debugln("DELETE clientId:", id)
+						}
+					}
+				}
+			}
+		}))
+
+		return nil
+	})
+
+	app.Listen("127.0.0.1:" + os.Args[1])
+}
diff --git a/modules/cache/cache.go b/modules/cache/cache.go
new file mode 100644
index 0000000..7cd03d6
--- /dev/null
+++ b/modules/cache/cache.go
@@ -0,0 +1,8 @@
+package cache
+
+import (
+	"clickandjoin.app/serversenteventsserver/modules/structs"
+	"github.com/google/uuid"
+)
+
+var SSEClients = make(map[uuid.UUID]structs.SSEClient)
diff --git a/modules/config/config.go b/modules/config/config.go
new file mode 100644
index 0000000..acc6981
--- /dev/null
+++ b/modules/config/config.go
@@ -0,0 +1,33 @@
+package config
+
+import (
+	"os"
+
+	"github.com/sirupsen/logrus"
+	"gopkg.in/yaml.v2"
+)
+
+var Cfg Config
+
+type Config struct {
+	Debug    bool
+	RabbitMq RabbitMq
+}
+
+type RabbitMq struct {
+	Host     string
+	Username string
+	Password string
+}
+
+func LoadConfig() {
+	data, err := os.ReadFile("config.yml")
+
+	if err != nil {
+		logrus.Fatalln("Failed to read config file, err:", err)
+	}
+
+	if err := yaml.Unmarshal(data, &Cfg); err != nil {
+		logrus.Fatalln("Failed to unmarshal config file, err:", err)
+	}
+}
diff --git a/modules/rabbitmq/rabbitmq.go b/modules/rabbitmq/rabbitmq.go
new file mode 100644
index 0000000..d921b0d
--- /dev/null
+++ b/modules/rabbitmq/rabbitmq.go
@@ -0,0 +1,101 @@
+package rabbitmq
+
+import (
+	"fmt"
+
+	"clickandjoin.app/serversenteventsserver/modules/cache"
+	"clickandjoin.app/serversenteventsserver/modules/config"
+	"clickandjoin.app/serversenteventsserver/modules/structs"
+	"clickandjoin.app/serversenteventsserver/modules/utils"
+	amqp "github.com/rabbitmq/amqp091-go"
+	"github.com/sirupsen/logrus"
+)
+
+var Conn *amqp.Connection
+var Channel *amqp.Channel
+
+const exchangeBroadcastMessages = "cnj.api.broadcast.messages"
+
+func getConnectionString() string {
+	cfg := &config.Cfg.RabbitMq
+
+	return fmt.Sprintf("amqp://%s:%s@%s/", cfg.Username, cfg.Password, cfg.Host)
+}
+
+func Init() {
+	conn, err := amqp.Dial(getConnectionString())
+
+	if err != nil {
+		logrus.Fatalln("RabbitMQ connection failed, err:", err)
+	}
+
+	ch, err := conn.Channel()
+
+	if err != nil {
+		logrus.Fatalln(err)
+	}
+
+	Channel = ch
+
+	/*
+	 * api broadcast messages
+	 */
+
+	q, err := ch.QueueDeclare(
+		"",    // name
+		false, // durable
+		false, // delete when unused
+		true,  // exclusive
+		false, // no-wait
+		nil,   // arguments
+	)
+
+	if err != nil {
+		logrus.Fatalln("Failed to declare queue, err:", err)
+	}
+
+	err = ch.QueueBind(
+		q.Name,                    // queue name
+		"",                        // routing key
+		exchangeBroadcastMessages, // exchange
+		false,
+		nil,
+	)
+
+	if err != nil {
+		logrus.Fatalln("Failed to declare queue, err:", err)
+	}
+
+	msgs, err := ch.Consume(
+		q.Name, // queue
+		"",     // consumer
+		true,   // auto-ack
+		false,  // exclusive
+		false,  // no-local
+		false,  // no-wait
+		nil,    // args
+	)
+
+	if err != nil {
+		logrus.Fatalln("Failed to register consumer, err:", err)
+	}
+
+	go func() {
+		for d := range msgs {
+			var receivedMessage structs.ReceivedMessage
+
+			err = utils.UnmarshalReceivedMessage(d.Body, &receivedMessage)
+
+			if err != nil {
+				logrus.Errorln("Failed to unmarshal received msg, err:", err)
+			}
+
+			logrus.Debugln("RABBITMQ RECEIVED BROADCAST MESSAGE:", receivedMessage)
+			logrus.Debugln("SENDING MSG TO", len(cache.SSEClients), "CLIENTS")
+
+			for id, sseClient := range cache.SSEClients {
+				sseClient.MessageChan <- structs.SSEClientChanMessage{ClientId: id, Message: string(d.Body)}
+			}
+		}
+	}()
+}
diff --git a/modules/structs/message.go b/modules/structs/message.go
new file mode 100644
index 0000000..38f578f
--- /dev/null
+++ b/modules/structs/message.go
@@ -0,0 +1,7 @@
+package structs
+
+type ReceivedMessage struct {
+	Cmd  int
+	Rec  string // represent receiver user id
+	Body any
+}
diff --git a/modules/structs/sseclient.go b/modules/structs/sseclient.go
new file mode 100644
index 0000000..398983a
--- /dev/null
+++ b/modules/structs/sseclient.go
@@ -0,0 +1,12 @@
+package structs
+
+import "github.com/google/uuid"
+
+type SSEClient struct {
+	MessageChan chan SSEClientChanMessage
+}
+
+type SSEClientChanMessage struct {
+	ClientId uuid.UUID
+	Message  string
+}
diff --git a/modules/utils/utils.go b/modules/utils/utils.go
new file mode 100644
index 0000000..3c28159
--- /dev/null
+++ b/modules/utils/utils.go
@@ -0,0 +1,30 @@
+package utils
+
+import (
+	"encoding/json"
+
+	"clickandjoin.app/serversenteventsserver/modules/structs"
+	"github.com/sirupsen/logrus"
+)
+
+func MarshalMessage(message any) (marshaledMessage []byte, err error) {
+	marshaledMessage, err = json.Marshal(message)
+
+	if err != nil {
+		logrus.Errorln("Failed to marshal send message, err:", err)
+		return nil, err
+	}
+
+	return marshaledMessage, nil
+}
+
+func UnmarshalReceivedMessage(body []byte, receivedMessage *structs.ReceivedMessage) error {
+	err := json.Unmarshal(body, &receivedMessage)
+
+	if err != nil {
+		logrus.Errorln("Failed to unmarshal received message, err:", err)
+		return err
+	}
+
+	return nil
+}