翔泳社 サンプルコード365+1 7/26 Go言語でNostrのサブスクリプション

nostr_subscription.go

package main

import (
	"fmt"
	"golang.org/x/net/websocket"
	"golang.org/x/term"
	"os"
	"strings"
	"time"
)

func main() {
	width, _, _ := term.GetSize(int(os.Stdout.Fd()))
	ws, _ := websocket.Dial("wss://relay.damus.io", "", "wss://localhost/")
	defer ws.Close()
	websocket.Message.Send(ws, `["REQ","sub1",{"kinds":[1]}]`)
	for {
		var msg []interface{}
		websocket.JSON.Receive(ws, &msg)
		if len(msg) >= 3 && msg[0] == "EVENT" && msg[1] == "sub1" {
			event := msg[2].(map[string]interface{})
			fmt.Printf("%s\n[%s user:%s]\n\n%s\n\n",
				strings.Repeat("-", width),
				time.Unix(int64(event["created_at"].(float64)), 0).Add(9*time.Hour),
				event["pubkey"].(string)[:8]+"...",
				event["content"].(string))
		}
	}
}