Retryable (Ruby gem)

Retryable (Ruby gem)
Name	Retryable
Title	Retryable (Ruby gem)
Author	Unknown
Developer	Community
Released	2010s
Programming language	Ruby
Platform	Cross-platform
License	MIT

Retryable (Ruby gem)

Retryable (Ruby gem) is a Ruby library that provides configurable retry semantics for blocks of code, commonly used to add resilience to network calls, database operations, and I/O-bound tasks. The gem is used in many Ruby (programming language) projects and integrates with ecosystems such as Rails (web framework), Sinatra (web framework), and background job systems like Sidekiq and Resque. Maintainers and contributors often draw on patterns from resilience frameworks like Hystrix and libraries in communities around Amazon Web Services, Google Cloud Platform, and Microsoft Azure.

Overview

Retryable implements a small DSL for retrying code blocks when exceptions occur, enabling developers to specify retry limits, backoff strategies, and exception filters. The gem is commonly invoked in applications that interact with external services such as PostgreSQL, MySQL, Redis, MongoDB, and HTTP APIs like GitHub and Stripe (company). It complements error-reporting tools such as Sentry (company), Rollbar, and New Relic by reducing transient failures before alerting. The project fits within Ruby community conventions established by RubyGems, Bundler, and influential repositories on GitHub.

Installation and Usage

Installation follows the RubyGems/Bundler workflow; add the gem to a Gemfile used by Bundler and run bundle install alongside other dependencies like Puma (web server) or Unicorn (web server). Typical usage wraps a block with Retryable to catch exceptions from adapters such as Net::HTTP, Faraday (software), or ORMs like ActiveRecord. In web applications leveraging Rails (web framework) or API clients built on Grape (framework), Retryable is often applied in middleware or service objects patterned after examples from Thoughtbot and Basecamp engineering blogs.

Configuration and Options

Retryable exposes configuration options for :tries, :sleep, :on, and exponential backoff behavior; these are conceptually similar to parameters found in libraries from Google (company) and Amazon (company) SDKs. Options control integration with monitoring tools like Datadog, and can be combined with circuit-breaker patterns inspired by Netflix engineering. The gem allows specifying exception classes such as Timeout::Error or Errno::ECONNREFUSED and interacts with Ruby exceptions raised by adapters including Sequel and Mongoid.

Error Handling and Retry Strategies

Strategies supported include fixed-delay retries, incremental backoff, and exponential backoff with jitter—approaches used in distributed systems designed by teams at Google LLC, Amazon Web Services, and Dropbox. Retryable can be composed with higher-level resilience tools such as Circuit breaker libraries and message-queue systems like RabbitMQ and Amazon SQS to implement idempotency and at-least-once delivery semantics discussed in literature from ACM and IEEE. Developers often combine Retryable with logging via Logstash, metrics emitted to Prometheus, and alerting rules in PagerDuty.

Examples and Common Patterns

Common patterns include wrapping HTTP calls to Stripe (company), Twilio, or SendGrid; database reconnection loops for PostgreSQL or MySQL; and retrying calls to external APIs like GitHub GraphQL or Twitter API. Example usages mirror code samples in community repositories from GitHub organizations and blog posts by engineers at Shopify, Heroku, and Airbnb. Integration patterns also appear in background workers using Sidekiq and scheduler jobs managed by cron-based systems or orchestration tools such as Kubernetes.

Compatibility and Performance Considerations

Retryable targets MRI Ruby and is compatible with implementations like JRuby and TruffleRuby depending on gem dependencies. Performance trade-offs follow general guidance from RubyGems and Bundler: additional retries increase latency and can exacerbate load in systems like Redis and Elasticsearch. When used in high-throughput services developed by teams at GitHub or Twitter, careful throttling, exponential backoff, and circuit breaking are advised to prevent cascading failures described in postmortems from Google and Amazon.

License and Maintenance

The gem is typically distributed under the MIT license and maintained on platforms such as GitHub by community contributors and organizations following collaboration models from Linux Foundation projects. Maintenance practices reflect standards from open-source projects like Ruby on Rails and use issue tracking, pull requests, and continuous integration with services like Travis CI and GitHub Actions.

Category:Ruby libraries