95 lines
2.1 KiB
Go
95 lines
2.1 KiB
Go
package main
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import (
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"bufio"
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"fmt"
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"os"
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"time"
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"clickandjoin.app/serversenteventsserver/modules/cache"
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"clickandjoin.app/serversenteventsserver/modules/config"
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"clickandjoin.app/serversenteventsserver/modules/rabbitmq"
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"clickandjoin.app/serversenteventsserver/modules/structs"
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"github.com/gofiber/fiber/v2"
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"github.com/gofiber/fiber/v2/middleware/cors"
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"github.com/google/uuid"
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"github.com/sirupsen/logrus"
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"github.com/valyala/fasthttp"
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)
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func init() {
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config.LoadConfig()
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if config.Cfg.Debug {
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logrus.SetLevel(logrus.DebugLevel)
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}
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logrus.Println("Debug:", config.Cfg.Debug)
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go rabbitmq.Init()
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}
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func main() {
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app := fiber.New()
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// wait so that rabbitmq can connect
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// TODO: better way to handle this
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time.Sleep(500 * time.Millisecond)
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if len(os.Args) < 2 {
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logrus.Fatalln("Please specify port")
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}
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// TODO: origin
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// CORS for external resources
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app.Use(cors.New(cors.Config{
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AllowOrigins: "*",
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AllowHeaders: "Cache-Control",
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AllowCredentials: true,
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}))
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app.Get("/sse", func(c *fiber.Ctx) error {
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c.Set("Content-Type", "text/event-stream")
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c.Set("Cache-Control", "no-cache")
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c.Set("Connection", "keep-alive")
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c.Set("Transfer-Encoding", "chunked")
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c.Context().SetBodyStreamWriter(fasthttp.StreamWriter(func(w *bufio.Writer) {
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var sseclient structs.SSEClient
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sseclient.MessageChan = make(chan structs.SSEClientChanMessage)
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clientId := uuid.New()
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cache.SSEClients[clientId] = sseclient
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logrus.Debugln("NEW CLIENT ID:", clientId)
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logrus.Debugln(len(cache.SSEClients), "CLIENTS CONNECTED")
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for message := range sseclient.MessageChan {
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fmt.Fprintf(w, "data: %s\n\n", message.Message)
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err := w.Flush()
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if err != nil {
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// Refreshing page in web browser will establish a new
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// SSE connection, but only (the last) one is alive, so
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// dead connections must be closed here.
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for id, sseClient := range cache.SSEClients {
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if id == message.ClientId {
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close(sseClient.MessageChan)
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delete(cache.SSEClients, id)
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logrus.Debugln("DELETE clientId:", id)
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}
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}
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}
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}
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}))
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return nil
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})
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app.Listen("127.0.0.1:" + os.Args[1])
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}
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