This repository is the Pulumi Infrastructure as Code (IaC) platform. It provides a CLI (`pulumi`) and multi-language SDKs (TypeScript, Python, Go, .NET, Java, YAML) that allow users to define cloud infrastructure using general-purpose programming languages. The architecture is a monorepo containing a core engine (`pkg/engine`) that orchestrates resource lifecycle management, deployment steps, and state operations. Language plugins (`pulumi-language-nodejs`, `pulumi-language-python`, `pulumi-language-go`) host user programs and communicate with the engine via gRPC. Code generators (`pkg/codegen`) produce SDKs from provider schemas, enabling a pluggable provider model. The CLI entry point is `pkg/cmd/pulumi/main.go`, dispatching to subcommands for stack management, deployment operations (up, preview, destroy, refresh), policy-as-code, config, secrets, and ESC (Environments, Secrets, Config). External dependencies include cloud provider APIs (AWS, Azure, GCP, Kubernetes) accessed through plugins, and state backends (local filesystem, S3, Azure Blob, GCS, PostgreSQL, or Pulumi Cloud). The system uses protobuf for serialization and gRPC for inter-process communication between engine, language hosts, and providers.
Nitric is a multi-cloud framework that enables developers to define cloud infrastructure and application logic in code, then deploy to AWS, Azure, or GCP. The framework provides infrastructure-as-code capabilities for cloud resources (APIs, storage, queues, topics, secrets, etc.) with runtime implementations for handling cloud service events. It features a modular architecture with core framework logic, cloud provider implementations, and a documentation site. The system uses a plugin-based worker system for handling cloud events and provides consistent abstractions across cloud providers through well-defined interfaces.
SST is a full-stack deployment framework and CLI tool for building and deploying serverless applications on AWS and Cloudflare. It uses Pulumi for infrastructure as code, provides a rich set of high-level components (Functions, Buckets, Queues, Databases, Auth, etc.), and supports multiple runtimes (Node.js, Python, Go, Rust) and frontend frameworks (Next.js, Remix, Astro, SvelteKit, SolidStart, etc.). The CLI offers live development mode with hot-reload, a terminal multiplexer, and SSH tunneling for VPC resources. The codebase is a monorepo with a Go CLI, TypeScript platform components, and SDKs in JavaScript, Python, Rust, and Go. While it demonstrates solid engineering patterns like a typed event bus, component transform system, and resource linking, it suffers from some deprecated components, code duplication across framework-specific SSR site components, and a high maintenance surface due to the sheer number of providers and examples.