$ show kubernetes-sigs/cri-tools
This repository provides two primary tools for the Kubernetes Container Runtime Interface (CRI): `crictl`, a CLI for debugging and managing CRI-compatible container runtimes (containerd, CRI-O, etc.), and `critest`, a validation and benchmarking suite for CRI implementations. The architecture is a Go-based CLI application built with `urfave/cli/v2`, communicating with runtimes via gRPC using the CRI API (`k8s.io/cri-api`). Key entry points are `cmd/crictl/main.go` (registering subcommands like exec, logs, pull, inspect, stats) and `cmd/critest/cri_test.go` (running Ginkgo-based conformance and benchmark tests). Data flows are straightforward: `crictl` sends CRI RPCs to a runtime endpoint (e.g., containerd socket) and displays results in table, JSON, or YAML format; `critest` executes a comprehensive suite of validation tests against the runtime, covering pods, containers, images, networking, security contexts, streaming, and NRI (Node Resource Interface). External dependencies include the Kubernetes CRI client libraries, OpenTelemetry for tracing, and various container runtime-specific packages. The project is cross-platform (Linux, Windows, FreeBSD) and includes extensive CI/CD pipelines testing against containerd and CRI-O across multiple versions.
The LLM identified 4 files worth highlighting for reuse:
Provides reusable generic patterns: `InterruptableRPC[T]` wraps CRI RPC calls with context cancellation and OS signal handling (Ctrl+C), `AggregateGoroutines` runs multiple functions concurrently and collects errors, `resourceStatus` fetches and marshals status of multiple resources (pod, container, image) with flexible output (JSON/YAML/template/table), and `collectIDs[T]` generically collects resource IDs from CLI args or lists all via `--all`. These patterns are self-contained, demonstrate non-obvious Go generics and concurrency handling, and can be extracted for any CLI tool that needs interruptible RPCs and parallel operations.
Implements `GetExecutor` and `GetDialer` functions that abstract over SPDY and WebSocket transport protocols for CRI streaming operations (exec, attach, port-forward). The code selects the appropriate transport based on configuration and runtime capabilities, providing a clean interface for streaming I/O. This pattern is reusable for any project needing to support multiple streaming protocols with fallback logic, and demonstrates careful handling of protocol negotiation and error cases.
Provides a reusable `InitTracer` function that initializes an OpenTelemetry tracer provider with configurable exporter (gRPC OTLP), service name, and resource attributes. It handles graceful shutdown and integrates with the CLI's tracing flags. This is a clean, self-contained module that can be extracted for any Go application needing OpenTelemetry tracing setup, demonstrating proper lifecycle management and configuration patterns.
Implements `NRITestPlugin`, a reusable test helper that starts a fake NRI (Node Resource Interface) plugin to intercept and verify container lifecycle events (RunPodSandbox, CreateContainer, etc.). It provides event recording, synchronization via channels, and hook callbacks for custom validation logic. This pattern is essential for any project needing to test NRI integration and demonstrates advanced goroutine coordination and event-driven testing patterns.