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1 Introduction 1.1 IaC Infrastructure as code(IaC) is the managing and provisioning of infrastructure through code instead of manual processes, for example, clicking button, adding or editing roles in AWS console. 1.2 AWS CloudFormation AWS CloudFormation is the original IaC tool for AWS, released in 2011, which uses template files to automate and mange the setup of AWS resources. 1.3 AWS CDK AWS Cloud Development Kit(CDK) is a product provided by AWS that makes it easier for developers to manage their infrastructure with familiar programming languages like TypeScript, Python, Java, etc. ...

1 Definition In computer science, a topological sort or topological ordering of a directed graph is a linear ordering of its vertices such that for every directed edge uv from vertex u to vertx v, u comes before v in the ordering. It sounds pretty academic, but I am sure you are using topological sort unconsciously every single day. 2 Application Many real world situations can be modeled as a graph with directed edges where some events must occur before others. Then a topological sort gives an order in which to perform these events, for instance: ...

1 Preface I have been maintained a legacy distributed timer for months for my employer, then some important pay business are leveraging on it, with 1 billion tasks handled every day and 20k tasks added per second at most. Even though it’s old and full of black magic code, but it also also have insighted and well-designed code. Based on this old, running timer, I summarize and extract as this article, and it wont include any running code(perhaps pseudocode, and a lot of figures, as an adage says: A picture is worth a thousand words). ...

Iterate through pagination in the Rest API 1 Preface About 4 months ago, icewind1991 created an exciting PR that adding Stream/Iterator based versions of methods with paginated results, which makes enpoints in Rspotify more much ergonomic to use, and Mario completed this PR. In order to know what this PR brought to us, we have to go back to the orignal story, the paginated results in Spotify’s Rest API. 2 Orignal Story Taking the artist_albums as example, it gets Spotify catalog information about an artist’s albums. ...

The lesson learned from refactoring rspotify 1 Preface Recently, I and Mario are working on refactoring rspotify, trying to improve performance, documentation, error-handling, data model and reduce compile time, to make it easier to use. (For those who has never heard about rspotify, it is a Spotify HTTP SDK implemented in Rust). I am partly focusing on polishing the data model, based on the issue created by Koxiaet. Since rspotify is API client for Spotify, it has to handle the request and response from Spotify HTTP API. ...