Wait4X is a versatile and lightweight tool designed to confidently manage service readiness checks across various environments. It effectively waits for ports or services to reach the desired state, making it indispensable in scenarios such as:

• CI/CD Pipelines: Ensure that all dependencies are ready before executing tests.
• Container Orchestration: Verify health checks for services prior to application startup.
• Deployment Procedures: Confirm system readiness before proceeding with deployments.
• Application Initialization: Guarantee that external services are available at startup.
• Local Development: Streamline service readiness checks in local environments.

Key Features

Feature	Description
Multi-Protocol Support	Compatible with TCP, HTTP, DNS protocols.
Service Integrations	Works with popular databases like Redis, MySQL, PostgreSQL, MongoDB, as well as message queues like RabbitMQ and Temporal.
Reverse Checking	Allows checks to identify free ports and non-ready services.
Parallel Checking	Facilitates simultaneous checks for multiple services.
Exponential Backoff	Implements retry logic with increasing delays to enhance stability.
CI/CD Integration	Tailored for seamless automation workflows.
Cross-Platform Compatibility	Provides a single binary useable on Linux, macOS, and Windows.
Go Package Accessibility	Easily importable into Go applications.
Command Execution	Enables execution of commands once checks succeed.

Quick Start Code Examples

• Basic TCP Check\ Wait for a specific port to become available:

  wait4x tcp localhost:3306
  

• HTTP Health Check\ Check for a web server's specific response:

  wait4x http https://example.com/health --expect-status-code 200 --expect-body-regex '"status":"UP"'
  

• Multi-Service Check (Parallel)\ Wait for multiple services simultaneously:

  wait4x tcp 127.0.0.1:5432 127.0.0.1:6379 127.0.0.1:27017
  

• Database Readiness Check\ Validate PostgreSQL readiness:

  wait4x postgresql 'postgres://user:pass@localhost:5432/mydb?sslmode=disable'
  

• Execute Command After Success\ Run a command after confirming services are ready:

  wait4x tcp localhost:8080 -- echo "Service is ready!" && ./start-app.sh
  

Comprehensive Usage

Wait4X supports advanced features such as setting timeouts, customizing headers, and parallel checks. For detailed examples on various use cases, including custom checkers and advanced options for HTTP and DNS checking, consult the extensive examples/pkg directory. Each example features a runnable main.go file for practical demonstration.

Contributions to the project are welcomed through open issues and pull requests, ensuring that Wait4X remains an effective and user-friendly tool for managing service readiness across a range of applications.