add notification for new post in thread

apps/api.lua

@@ -0,0 +1,36 @@
+local app = require("lapis").Application()
+local sse = require("lib.sse")
+
+local db = require("lapis.db")
+
+local util = require("util")
+
+app:get("sse_thread_updates", "/thread-updates/:thread_id", function(self)
+  do
+    local thread = db.query("SELECT threads.id FROM threads WHERE threads.id = ?", self.params.thread_id)
+    if #thread == 0 then
+      return {status = 404, skip_render = true}
+    end
+  end
+  
+  local now = os.time()
+  local stream = sse:new()
+  
+  local thread_id = self.params.thread_id
+  local new_posts_query = "SELECT id FROM posts WHERE thread_id = ? AND posts.created_at > ? ORDER BY posts.created_at ASC LIMIT 1"
+  
+  while stream.active do
+    stream:dispatch()
+    local new_post = db.query(new_posts_query, thread_id, now)
+    if #new_post > 0 then
+      local url = util.get_post_url(self, new_post[1].id)
+      stream:enqueue(url, "new_post_url")
+    end
+    
+    ngx.sleep(5)
+  end
+  
+  return {skip_render = true}
+end)
+
+return app