feat(coderd): add new dispatch logic for coder inbox (#16764)

This PR is [resolving the dispatch part of Coder
Inbocx](https://github.com/coder/internal/issues/403).

Since the DB layer has been merged - we now want to insert notifications
into Coder Inbox in parallel of the other delivery target.

To do so, we push two messages instead of one using the `Enqueue`
method.

coderd/database/dump.sql

@@ -113,7 +113,8 @@ CREATE TYPE notification_message_status AS ENUM (
 
 CREATE TYPE notification_method AS ENUM (
     'smtp',
-    'webhook'
+    'webhook',
+    'inbox'
 );
 
 CREATE TYPE notification_template_kind AS ENUM (

coderd/database/migrations/000299_notifications_method_inbox.down.sql

@@ -0,0 +1,3 @@
+-- The migration is about an enum value change
+-- As we can not remove a value from an enum, we can let the down migration empty
+-- In order to avoid any failure, we use ADD VALUE IF NOT EXISTS to add the value

coderd/database/migrations/000299_notifications_method_inbox.up.sql

@@ -0,0 +1 @@
+ALTER TYPE notification_method ADD VALUE IF NOT EXISTS 'inbox';

coderd/database/models.go

@@ -878,6 +878,7 @@ type NotificationMethod string
 const (
 	NotificationMethodSmtp    NotificationMethod = "smtp"
 	NotificationMethodWebhook NotificationMethod = "webhook"
+	NotificationMethodInbox   NotificationMethod = "inbox"
 )
 
 func (e *NotificationMethod) Scan(src interface{}) error {
@@ -918,7 +919,8 @@ func (ns NullNotificationMethod) Value() (driver.Value, error) {
 func (e NotificationMethod) Valid() bool {
 	switch e {
 	case NotificationMethodSmtp,
-		NotificationMethodWebhook:
+		NotificationMethodWebhook,
+		NotificationMethodInbox:
 		return true
 	}
 	return false
@@ -928,6 +930,7 @@ func AllNotificationMethodValues() []NotificationMethod {
 	return []NotificationMethod{
 		NotificationMethodSmtp,
 		NotificationMethodWebhook,
+		NotificationMethodInbox,
 	}
 }
 

coderd/database/queries.sql.go

@@ -3804,6 +3804,7 @@ SELECT
     nm.method,
     nm.attempt_count::int                                                 AS attempt_count,
     nm.queued_seconds::float                                              AS queued_seconds,
+    nm.targets,
     -- template
     nt.id                                                                 AS template_id,
     nt.title_template,
@@ -3829,6 +3830,7 @@ type AcquireNotificationMessagesRow struct {
 	Method        NotificationMethod `db:"method" json:"method"`
 	AttemptCount  int32              `db:"attempt_count" json:"attempt_count"`
 	QueuedSeconds float64            `db:"queued_seconds" json:"queued_seconds"`
+	Targets       []uuid.UUID        `db:"targets" json:"targets"`
 	TemplateID    uuid.UUID          `db:"template_id" json:"template_id"`
 	TitleTemplate string             `db:"title_template" json:"title_template"`
 	BodyTemplate  string             `db:"body_template" json:"body_template"`
@@ -3865,6 +3867,7 @@ func (q *sqlQuerier) AcquireNotificationMessages(ctx context.Context, arg Acquir
 			&i.Method,
 			&i.AttemptCount,
 			&i.QueuedSeconds,
+			pq.Array(&i.Targets),
 			&i.TemplateID,
 			&i.TitleTemplate,
 			&i.BodyTemplate,

coderd/database/queries/notifications.sql

@@ -84,6 +84,7 @@ SELECT
     nm.method,
     nm.attempt_count::int                                                 AS attempt_count,
     nm.queued_seconds::float                                              AS queued_seconds,
+    nm.targets,
     -- template
     nt.id                                                                 AS template_id,
     nt.title_template,