basic notifications impl for back-end

db/migrations/20_notifications.sql

@@ -0,0 +1,15 @@
+-- +migrate up
+CREATE TABLE notifications (
+  id  SERIAL  PRIMARY KEY,
+
+  account_id  INTEGER  NOT NULL  references accounts(id),
+  type        TEXT     NOT NULL,
+  target      INTEGER,           -- represents whatever is affected; for SQL querying assistance. INTEGER because it's always an ID, might be tweaked in the future
+  details     TEXT     NOT NULL, -- a JSON of various things relevant to displaying the notification
+
+  created_at  TEXT  NOT NULL  DEFAULT (STRFTIME('%Y-%m-%d %H:%M:%f', 'now')),
+  read_at     TEXT
+);
+
+-- +migrate down
+DROP TABLE notifications;

src/crystal-gauntlet.cr

@@ -26,6 +26,7 @@ require "./lib/creator_points"
 require "./lib/versions"
 require "./lib/ips"
 require "./lib/ranks"
+require "./lib/notifications"
 
 require "./patch-exe.cr"
 

src/endpoints/levels/rateLevel.cr

@@ -105,7 +105,19 @@ CrystalGauntlet.endpoints["/suggestGJStars20.php"] = ->(context : HTTP::Server::
     return "-2"
   end
 
-  DATABASE.exec "update levels set stars = ?, featured = ?, difficulty = ? where id = ?", params["stars"].to_i, params["feature"].to_i, (stars_to_difficulty(params["stars"].to_i) || LevelDifficulty::Easy).to_i, params["levelID"].to_i
+  level_id = params["levelID"].to_i
+  stars = params["stars"].to_i
+  difficulty = stars_to_difficulty(params["stars"].to_i) || LevelDifficulty::Easy
+
+  author_account_id = DATABASE.query_one("select users.account_id from levels left join users on users.id = levels.user_id where levels.id = ?", level_id, as: {Int32?})
+  if author_account_id
+    notif_type = params["feature"] == "1" ? "authored_level_featured" : "authored_level_rated"
+
+    Notifications.clear_previous_notifications(author_account_id, notif_type, level_id)
+    Notifications.send_notification(author_account_id, notif_type, level_id, {"stars" => stars.to_i64, "difficulty" => difficulty.to_i64})
+  end
+
+  DATABASE.exec "update levels set stars = ?, featured = ?, difficulty = ? where id = ?", stars, params["feature"].to_i, difficulty.to_i, level_id
   "1"
 }
 

src/lib/notifications.cr

@@ -0,0 +1,17 @@
+require "json"
+
+include CrystalGauntlet
+
+module CrystalGauntlet::Notifications
+  extend self
+
+  alias NotificationValue = Hash(String, String | Int64 | Bool | Float64 | Nil)
+
+  def clear_previous_notifications(account_id : Int32, type : String, target : Int32)
+    DATABASE.exec("delete from notifications where account_id = ? and type = ? and target = ?", account_id, type, target)
+  end
+
+  def send_notification(account_id : Int32, type : String, target : Int32?, details : NotificationValue? = nil)
+    DATABASE.exec("insert into notifications (id, account_id, type, target, details) values (?, ?, ?, ?, ?)", IDs.get_next_id("notifications"), account_id, type, target, details.try &.to_json || "{}")
+  end
+end