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Monorepo for Tangled
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import ( "bytes" "context" "fmt" "html/template" "log/slog" "strings" gotemplate "text/template" "time"
"tangled.org/core/appview/config" "tangled.org/core/appview/db" "tangled.org/core/appview/email" "tangled.org/core/appview/models" "tangled.org/core/idresolver")
const digestTextTmpl = `Hi {{.RecipientHandle}},
You have {{.Count}} new notification(s) on Tangled:
{{range .Groups}}- {{wrap 70 " " .Header}}{{if .EntityRef}} {{wrap 70 " " .EntityRef}}{{end}} {{.URL}}{{end}}{{if .HasMore}}View more notifications: {{.NotificationsURL}}{{end}}---Manage notifications: {{.SettingsURL}}`
const digestHTMLTmpl = `<!DOCTYPE html><html dir="ltr" lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Tangled notifications</title></head><body style="background-color:#ffffff;padding:0;font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;"><table border="0" width="100%" cellpadding="0" cellspacing="0" role="presentation" align="center"> <tbody> <tr> <td style="background-color:#ffffff;padding:16px;color:#111827;font-size:16px;font-weight:400;"> <table align="center" border="0" cellpadding="0" cellspacing="0" role="presentation" style="max-width:600px;width:100%;table-layout:fixed;color:#111827;background-color:#ffffff;margin-left:auto;margin-right:auto;"> <tbody> <tr> <td> <div style="padding-bottom:16px;"> <img src="{{.AssetsURL}}dolly.png" width="40" height="40" alt="Tangled" style="display:block;border:0;"> </div> <p style="font-size:16px;padding:16px 0;">Hi {{.RecipientHandle}},</p> <p style="font-size:16px;padding:0 0 16px 0;margin:0;"> You have {{.Count}} new notification{{if gt .Count 1}}s{{end}}: </p> <table width="100%" cellpadding="0" cellspacing="0" role="presentation"> {{range .Groups}} <tr> <td style="padding:12px 0;border-bottom:1px solid #eaeaea;"> <a href="{{.URL}}" style="text-decoration:none;color:inherit;display:block;"> <table cellpadding="0" cellspacing="0" width="100%" role="presentation"> <tr> <td style="width:20px;vertical-align:top;padding-top:1px;"> <img src="{{.IconURL}}" width="16" height="16" alt="" style="display:block;border:0;"> </td> <td style="padding-left:8px;"> <p style="margin:0 0 3px 0;font-size:14px;color:#374151;">{{.HeaderHTML}}</p> {{if .EntityRef}}<p style="margin:0;font-size:13px;color:#6b7280;">{{.EntityRef}}</p>{{end}} </td> </tr> </table> </a> </td> </tr> {{end}} </table> {{if .HasMore}} <p style="font-size:14px;padding:16px 0 0 0;margin:0;"> <a href="{{.NotificationsURL}}" style="color:#111827;text-decoration:underline;font-weight:400;">View more notifications</a> </p> {{end}} <table align="center" width="100%" border="0" cellpadding="0" cellspacing="0" role="presentation"> <tbody> <tr> <td> <p style="font-size:16px;padding:32px 0 16px 0;text-align:center;"> <a href="{{.SettingsURL}}" style="color:#111827;text-decoration:underline;font-weight:400;">Manage notification settings</a> </p> <p style="font-size:16px;text-align:center;color:#6b7280;">Tangled Labs Oy. © 2026 All rights reserved.</p> <p style="font-size:16px;text-align:center;"> <a href="https://tangled.org" style="color:#111827;text-decoration:underline;font-weight:400;">tangled.org</a> · <a href="https://bsky.app/profile/tangled.org" style="color:#111827;text-decoration:underline;font-weight:400;">Bluesky</a> · <a href="https://x.com/tangled_org" style="color:#111827;text-decoration:underline;font-weight:400;">X</a> · <a href="https://linkedin.com/in/tangled" style="color:#111827;text-decoration:underline;font-weight:400;">LinkedIn</a> </p> </td> </tr> </tbody> </table> </td> </tr> </tbody> </table> </td> </tr> </tbody></table></body></html>`
type digestGroup struct { IconURL string Header string HeaderHTML template.HTML EntityRef string URL string}
func notifHeader(n *models.NotificationWithEntity, actor, repo string) string { switch n.Type { case models.NotificationTypeIssueCreated: return actor + " opened an issue on " + repo case models.NotificationTypeIssueCommented: return actor + " commented on an issue on " + repo case models.NotificationTypeIssueClosed: return actor + " closed an issue on " + repo case models.NotificationTypeIssueReopen: return actor + " reopened an issue on " + repo case models.NotificationTypePullCreated: return actor + " created a PR on " + repo case models.NotificationTypePullCommented: return actor + " commented on a PR on " + repo case models.NotificationTypePullMerged: return actor + " merged a PR on " + repo case models.NotificationTypePullClosed: return actor + " closed a PR on " + repo case models.NotificationTypePullReopen: return actor + " reopened a PR on " + repo case models.NotificationTypeUserMentioned: if n.Issue != nil { return actor + " mentioned you on an issue in " + repo } else if n.Pull != nil { return actor + " mentioned you on a pull request in " + repo } return actor + " mentioned you in " + repo case models.NotificationTypeIssueAssigned: return actor + " assigned you to an issue on " + repo case models.NotificationTypeIssueUnassigned: return actor + " unassigned you from an issue on " + repo case models.NotificationTypePullAssigned: return actor + " assigned you to a PR on " + repo case models.NotificationTypePullUnassigned: return actor + " unassigned you from a PR on " + repo default: return actor + " updated " + repo }}
func notifEntityRef(n *models.NotificationWithEntity) string { if n.Issue != nil { return fmt.Sprintf("#%d %s", n.Issue.IssueId, n.Issue.Title) } if n.Pull != nil { return fmt.Sprintf("#%d %s", n.Pull.PullId, n.Pull.Title) } return ""}
func wordwrap(width int, indent, text string) string { words := strings.Fields(text) if len(words) == 0 { return text } var b strings.Builder col := 0 for i, w := range words { if i == 0 { b.WriteString(w) col = len(w) continue } if col+1+len(w) > width { b.WriteString("\n" + indent) b.WriteString(w) col = len(indent) + len(w) } else { b.WriteByte(' ') b.WriteString(w) col += 1 + len(w) } } return b.String()}
// digestMaxGroups caps how many notifications are itemized in a digest email;// beyond this a "View more" link points to the notifications page.const digestMaxGroups = 10
type digestData struct { RecipientHandle string Count int Groups []digestGroup HasMore bool NotificationsURL string SettingsURL string AssetsURL string}
// Dispatcher polls the notifications table and sends digest emails.type Dispatcher struct { db *db.DB resend config.ResendConfig baseURL string assetsURL string resolver *idresolver.Resolver logger *slog.Logger batchWait time.Duration interval time.Duration
textTmpl *gotemplate.Template htmlTmpl *template.Template}
func NewDispatcher( database *db.DB, resend config.ResendConfig, baseURL string, resolver *idresolver.Resolver, logger *slog.Logger, dev bool,) *Dispatcher { batchWait := 10 * time.Minute interval := 5 * time.Minute if dev { batchWait = 30 * time.Second interval = 15 * time.Second } return &Dispatcher{ db: database, resend: resend, baseURL: strings.TrimRight(baseURL, "/"), assetsURL: strings.TrimRight(resend.AssetsURL, "/") + "/", resolver: resolver, logger: logger, batchWait: batchWait, interval: interval, textTmpl: gotemplate.Must(gotemplate.New("digest-text").Funcs(gotemplate.FuncMap{"wrap": wordwrap}).Parse(digestTextTmpl)), htmlTmpl: template.Must(template.New("digest-html").Parse(digestHTMLTmpl)), }}
// Start runs the dispatcher ticker loop until ctx is cancelled.func (d *Dispatcher) Start(ctx context.Context) { d.logger.Info("email dispatcher started", "interval", d.interval, "batchWait", d.batchWait) ticker := time.NewTicker(d.interval) defer ticker.Stop() for { select { case <-ticker.C: d.dispatch(ctx) case <-ctx.Done(): d.logger.Info("email dispatcher stopped") return } }}
func (d *Dispatcher) dispatch(ctx context.Context) { cutoff := time.Now().Add(-d.batchWait)
recipients, err := db.GetPendingEmailDigestRecipients(d.db, cutoff) if err != nil { d.logger.Error("email dispatcher: failed to get recipients", "err", err) return }
d.logger.Debug("email dispatcher: processing recipients", "count", len(recipients))
for _, recipientDid := range recipients { if err := d.sendDigest(ctx, recipientDid, cutoff); err != nil { d.logger.Error("email dispatcher: failed to send digest", "did", recipientDid, "err", err) } }}
func (d *Dispatcher) sendDigest(ctx context.Context, recipientDid string, cutoff time.Time) error { em, err := db.GetPrimaryEmail(d.db, recipientDid) if err != nil || !em.Verified { return nil }
notifs, err := db.GetPendingNotificationsForEmailDigest(d.db, recipientDid, cutoff) if err != nil { return fmt.Errorf("get pending notifications: %w", err) } if len(notifs) == 0 { return nil }
handle := recipientDid if id, err := d.resolver.ResolveIdent(ctx, recipientDid); err == nil && !id.Handle.IsInvalidHandle() { handle = id.Handle.String() }
subject, text, html, err := d.renderDigest(ctx, handle, notifs) if err != nil { return fmt.Errorf("render digest: %w", err) }
// collect IDs before sending so new notifications created during sending // aren't accidentally marked as emailed. ids := make([]int64, len(notifs)) for i, n := range notifs { ids[i] = n.ID }
if err := email.SendEmail(email.Email{ APIKey: d.resend.ApiKey, From: "Tangled <" + d.resend.SentFrom + ">", To: em.Address, Subject: subject, Text: text, Html: html, }); err != nil { return fmt.Errorf("send email: %w", err) }
d.logger.Info("email dispatcher: digest sent", "did", recipientDid, "notifications", len(notifs))
if err := db.MarkNotificationsEmailed(d.db, ids); err != nil { d.logger.Error("email dispatcher: failed to mark notifications emailed", "did", recipientDid, "err", err) }
return nil}
func (d *Dispatcher) renderDigest(ctx context.Context, recipientHandle string, notifs []*models.NotificationWithEntity) (subject, text, html string, err error) { count := len(notifs)
shown := notifs if len(shown) > digestMaxGroups { shown = shown[:digestMaxGroups] }
groups := make([]digestGroup, 0, len(shown))
for _, n := range shown { actorHandle := n.ActorDid if id, err2 := d.resolver.ResolveIdent(ctx, n.ActorDid); err2 == nil && !id.Handle.IsInvalidHandle() { actorHandle = id.Handle.String() }
repoStr := "" if n.Repo != nil { repoHandle := n.Repo.Did if id, err2 := d.resolver.ResolveIdent(ctx, n.Repo.Did); err2 == nil && !id.Handle.IsInvalidHandle() { repoHandle = id.Handle.String() } repoStr = repoHandle + "/" + n.Repo.Slug() }
header := notifHeader(n, actorHandle, repoStr) headerHTML := template.HTML(strings.Replace(header, actorHandle, "<strong>"+actorHandle+"</strong>", 1)) groups = append(groups, digestGroup{ IconURL: d.assetsURL + n.Icon() + ".png", Header: header, HeaderHTML: headerHTML, EntityRef: notifEntityRef(n), URL: d.baseURL + n.URL(d.resolver), }) }
data := digestData{ RecipientHandle: recipientHandle, Count: count, Groups: groups, HasMore: count > digestMaxGroups, NotificationsURL: d.baseURL + "/notifications", SettingsURL: d.baseURL + "/settings/notifications", AssetsURL: d.assetsURL, }
if count > digestMaxGroups { subject = fmt.Sprintf("[%s] %d+ notifications", recipientHandle, digestMaxGroups) } else { subject = fmt.Sprintf("[%s] %d notification(s)", recipientHandle, count) }
var textBuf bytes.Buffer if err = d.textTmpl.Execute(&textBuf, data); err != nil { return } text = textBuf.String()
var htmlBuf bytes.Buffer if err = d.htmlTmpl.Execute(&htmlBuf, data); err != nil { return } html = htmlBuf.String()
return}