$ show crossplane-contrib/provider-aws
This is the official Crossplane provider for AWS, a Kubernetes-native controller that manages AWS cloud resources as Custom Resource Definitions (CRDs). It defines hundreds of APIs across 50+ AWS services (EC2, S3, IAM, RDS, EKS, Lambda, etc.) and implements controllers that reconcile the desired state by calling AWS SDK operations. The system follows the Crossplane managed resource pattern: each resource type has a corresponding controller with hooks for observe, create, update, delete, and late initialization. A single binary (`cmd/provider/main.go`) registers all controllers and runs as a Kubernetes controller manager. The project relies heavily on code generators (angryjet, ack-generate, goverter, controller-gen) to produce CRD types, conversion functions, and resolver code from AWS API schemas. Hand-written custom hooks add resource-specific logic (e.g., tag diffing, policy comparison, engine version ordering). While the architecture is solid and the project is actively maintained, technical drift is present due to mixed AWS SDK v1/v2 usage, many incomplete `isUpToDate` implementations, and a large surface of generated code that must be kept in sync.
The LLM identified 3 files worth highlighting for reuse:
A collection of functions for safe pointer-to-value conversion and late initialization of AWS SDK fields. Includes converters from int32 to int64, to/from pointers, and late-init helpers that avoid overwriting existing values with zero when the AWS response returns nil. These are generic and usable in any Go project dealing with AWS SDK structs.
Implements an efficient diff strategy for EC2 security group IP permissions. Uses map-based merging to compute toAdd/toRevoke sets in O(n) time instead of nested loops. The algorithm is reusable for any project that needs to diff order-independent sets of structs (like protocols, ports, Cidr blocks). It demonstrates non-obvious skill in handling AWS API quirks.
Provides a robust comparison function for AWS IAM policy documents. It normalizes JSON by sorting array and key ordering, then uses `google/go-cmp` for diffing. This solves the common problem of comparing policy documents that are semantically identical but differ in key ordering or whitespace. Although it imports an internal API type (`common.ResourcePolity`), the core normalization logic can be extracted for other projects dealing with JSON policy comparison.