mirror of
https://github.com/strukturag/nextcloud-spreed-signaling
synced 2026-03-14 14:35:44 +01:00
136 lines
3.8 KiB
Go
136 lines
3.8 KiB
Go
/**
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* Standalone signaling server for the Nextcloud Spreed app.
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* Copyright (C) 2025 struktur AG
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*
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* @author Joachim Bauch <bauch@struktur.de>
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package nats
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import (
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"context"
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"encoding/base64"
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"encoding/json"
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"errors"
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"os"
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"os/signal"
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"strings"
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"time"
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"github.com/nats-io/nats.go"
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"github.com/strukturag/nextcloud-spreed-signaling/async"
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"github.com/strukturag/nextcloud-spreed-signaling/log"
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)
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const (
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initialConnectInterval = time.Second
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maxConnectInterval = 8 * time.Second
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LoopbackUrl = "nats://loopback"
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DefaultURL = nats.DefaultURL
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)
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var (
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ErrConnectionClosed = nats.ErrConnectionClosed
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)
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type Msg = nats.Msg
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type Subscription interface {
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Unsubscribe() error
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}
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type Client interface {
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Close(ctx context.Context) error
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Subscribe(subject string, ch chan *Msg) (Subscription, error)
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Publish(subject string, message any) error
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}
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// The NATS client doesn't work if a subject contains spaces. As the room id
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// can have an arbitrary format, we need to make sure the subject is valid.
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// See "https://github.com/nats-io/nats.js/issues/158" for a similar report.
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func GetEncodedSubject(prefix string, suffix string) string {
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return prefix + "." + base64.StdEncoding.EncodeToString([]byte(suffix))
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}
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func NewClient(ctx context.Context, url string, options ...nats.Option) (Client, error) {
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logger := log.LoggerFromContext(ctx)
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if url == ":loopback:" {
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logger.Printf("WARNING: events url %s is deprecated, please use %s instead", url, LoopbackUrl)
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url = LoopbackUrl
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}
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if url == LoopbackUrl {
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logger.Println("Using internal NATS loopback client")
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return NewLoopbackClient(logger)
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}
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backoff, err := async.NewExponentialBackoff(initialConnectInterval, maxConnectInterval)
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if err != nil {
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return nil, err
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}
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client := &NativeClient{
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logger: logger,
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closed: make(chan struct{}),
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}
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options = append([]nats.Option{
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nats.ClosedHandler(client.onClosed),
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nats.DisconnectHandler(client.onDisconnected),
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nats.ReconnectHandler(client.onReconnected),
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nats.MaxReconnects(-1),
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}, options...)
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client.conn, err = nats.Connect(url, options...)
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ctx, stop := signal.NotifyContext(ctx, os.Interrupt)
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defer stop()
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// The initial connect must succeed, so we retry in the case of an error.
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for err != nil {
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logger.Printf("Could not create connection (%s), will retry in %s", err, backoff.NextWait())
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backoff.Wait(ctx)
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if ctx.Err() != nil {
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return nil, errors.New("interrupted")
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}
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client.conn, err = nats.Connect(url)
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}
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logger.Printf("Connection established to %s (%s)", removeURLCredentials(client.conn.ConnectedUrl()), client.conn.ConnectedServerId())
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return client, nil
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}
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func Decode(msg *nats.Msg, vPtr any) (err error) {
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switch arg := vPtr.(type) {
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case *string:
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// If they want a string and it is a JSON string, strip quotes
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// This allows someone to send a struct but receive as a plain string
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// This cast should be efficient for Go 1.3 and beyond.
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str := string(msg.Data)
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if strings.HasPrefix(str, `"`) && strings.HasSuffix(str, `"`) {
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*arg = str[1 : len(str)-1]
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} else {
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*arg = str
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}
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case *[]byte:
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*arg = msg.Data
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default:
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err = json.Unmarshal(msg.Data, arg)
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}
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return
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}
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