Retry inserts, lazy patch to solve sqlite3 concurrency

main.rb

@@ -20,6 +20,19 @@ def h(bytes)
   end
 end
 
+def attempt(attempts, &block)
+  begin
+    block.call
+  rescue
+    if attempts > 1
+      attempts -= 1
+      retry
+    else
+      raise
+    end
+  end
+end
+
 set :public_folder, __dir__ + '/public'
 get '/' do
   downloads = ActiveRecord::Base.connection.execute("
@@ -73,12 +86,14 @@ post '/video' do
 
   data = JSON.parse(request.body.read)
 
-  Download.create!(
+  attempt(10) do
-    video: Video.find_by!(randname: data["video_id"]),
+    Download.create!(
-    size: data["size"],
+      video: Video.find_by!(randname: data["video_id"]),
-    sha256: data["sha256"],
+      size: data["size"],
-    email: data["email"],
+      sha256: data["sha256"],
-  )
+      email: data["email"],
+    )
+  end
 
   { status: 'ok' }.to_json
 end