Aug 28Using Protobuf Message in Redis with GolangData marshaling, migration and backward compatibility — In this article, I want to describe how to use protobuf message for Redis storage, generate protocol buffers messages from code and migrate data to protobuf with backward-compatibility. Golang and Redis are just taken as an example, you can do the same with almost any language and database. What is Protocol Buffers? Protobuf is…Golang4 min readGolang4 min read
Mar 27Открытие счета в банке при переезде в UKОдной из первых задач при переезде в Англию является открытие счета в банке. Осложняется все тем, что большинство банков по умолчанию требуют как минимум наличие постоянного адреса и BRP (Biometric Residence Permit). Так как поиск жилья в Кембридже, как и в целом по UK, далеко не быстрый процесс, кажется, что…Англия5 min readАнглия5 min read
Mar 27How to find Min or Max value in a Stack with GoThis is a typical interview question which is going to ask you to implement a stack which can track the maximum or minimum value for the current stack. In this note, I want to show a solution on how to implement a Min stack. …Golang3 min readGolang3 min read
Jan 3Опыт поиска жилья в КембриджеПоиск жилья основная сложность с которой я столкнулся после переезда в Англию. Главной проблемой является огромный спрос и небольшое количество свободных квартир. На большинство вариантов которые я смотрел или собирался смотреть было несколько конкурирующих оферов от людей, которые также как и я искали жилье. Решил написать этот пост, так как…Кембридж7 min readКембридж7 min read
Jul 31, 2021BFS and DFS algorithms in RubyIn this article I’ll consider two common approaches to implementing depth-first search and breadth-first search in Ruby. Tree Ruby has no built-in class for initializing Binary Tree data structure. Tree is just a restricted form of a Graph which have a parent-child relationship. Here is the simplest definition for a binary…DFS2 min readDFS2 min read
Jan 2, 2021Ruby Graceful Application Shutdown with SignalException and SIGTERMIn Container-based DevOps solutions like Kubernetes, ECS, Heroku an application must be able to stop accepting new client requests before termination, and, most importantly, it must successfully complete already running requests and processes. By default in most systems Graceful Shutdown implements by sending SIGTERM signal and 30 seconds delay before…Ruby2 min readRuby2 min read
Dec 13, 2020Difference between Mocks and Stubs in RSpecWhat is the difference, how and when to apply? — Stub A stub is the only defined result of the method call which doesn’t care about behavior. With RSpec, you can use stub with allow and receive methods. allow(object).to receive(:method_name) If you need to stub the result of the method then it’s possible with and_return allow(object).to receive(:method_name).and_return(example_value) Mock Mock expect methods to…Ruby1 min readRuby1 min read
Jun 22, 2020Graceful Request Retries in Ruby ApplicationsFailure Management, Fallbacks, Exponential backoff, Tools and Patterns — When designing modern applications on microservices architecture and systems based on cloud solutions such as AWS, Azure, or Google Cloud imply the need to handle expected failures. How to handle failures? Restarting the code in the current thread runtime Retry execute in background jobs Retry failed code We can represent the simplest retry in runtime as a…Ruby2 min readRuby2 min read
Jan 9, 2020Encrypted Secrets(Credentials) in Rails 6, Rails 5.1/5.2, older versions and non-Rails applicationsHow to manage encrypted keys for different environments — There are two most popular ways to manage secrets in your application. Encrypted file with secrets. Best choice for a single monolith application. There’s no need for additional software, just keep your encrypted data in the app repository and move decrypt key under git ignore. Centralized storage. For large and…Ruby On Rails4 min readRuby On Rails4 min read
Aug 25, 2019Find Time-Consuming ActiveRecord Database Queries with QueryTrackA tool for monitoring SQL queries in Rails — Get notified about slow queries In the early stages of development, it may be useful to identify slow queries in time (when you don’t have a paid APM). QueryTrack helps to get notified about slow queries with related data: duration and backtrace. https://github.com/kirillshevch/query_track Installation Add this line to your application’s Gemfile and then execute bundle install:Ruby On Rails2 min readRuby On Rails2 min read
