An API Server without Caching or Batching

Before we start diving into this new challenge, let’s implement a small demo server that we’ll use as a reference to measure the impact of the various techniques we’re going to implement.

Example

Let’s consider an API server that manages the sales of an e-commerce company. In particular, we want to query our server for the sum of all the transactions of a particular type of merchandise. For this purpose, we’re going to use a LevelUP database through the level npm package. The data model that we’re going to use is a simple list of transactions stored in the sales sublevel (a subsection of the database), which is organized in the following format:

transactionId {amount, product}

The key is represented by transactionId and the value is a JSON object that contains the amount of the sale (amount) and the product type (product).

The data to process is really basic, so let’s implement a simple query over the database that we can use for our experiments. Let’s say that we want to get the total amount of sales for a particular product. The routine would look as follows (the totalSales.js file):