Server Sent Events

Use send.SseUpgrade() to upgrade the connection to server sent events.

route.Route{Pattern: "GET /sse", Handler: welcome.View}

lib/routes/handlers/welcome/view.go

package welcome

import (
    "main/lib/core/client"
    "main/lib/core/receive"
    "main/lib/core/send"
    "time"
)

func View(c *client.Client) {
    a := receive.IsAlive(c)       // Tracks request status.
    ev := send.SseUpgrade(c)      // Sends sse upgrade.
    for *a {                      // Loops until cancellation.
       ev("channel-1")            // Switches to "channel-1".
       send.Message(c, "Hello 1") // Sends message.
       ev("channel-2")            // Switches to "channel-2".
       send.Message(c, "Hello 2") // Sends message.
       time.Sleep(time.Second)    // Sleeps for 1 second.
    }
}

Then consume the stream on the client.

<script lang="ts">
    import {source} from "$lib/scripts/core/source.ts";
    const con = source("/sse")        // Connects to the handler.
    const ch1 = c.select("channel-1") // Listens to "channel-1".
    const ch2 = c.select("channel-2") // Listens to "channel-2".
</script>

<h1>Channel 1</h1>
<span>{$ch1}</span>                   <!-- Renders most recent value of channel-1. -->

<h1>Channel 2</h1>
<span>{$ch2}</span>                   <!-- Renders most recent value of channel-2. -->