strict-architecture

Strict Architecture Governance

These rules apply to ALL code in this project, regardless of language.

1. Universal Limits (Non-Negotiable)

These constraints apply to every source file:

• MAX_LINES: 500 lines per file. (Split file if exceeded)
• MAX_FUNCS: 5 public functions/methods per class/struct.
• MAX_ARGS: 4 arguments per function/constructor.
• NO_DEFAULTS: No default argument values allowed.
• NO_ENV_VARS: No reading environment variables inside constructors or methods (pass values in).

2. Implementation Patterns by Language

Python Implementation

• Interfaces: Use typing.Protocol for all dependencies.

  class IClient(Protocol):
      def fetch(self) -> dict: ...
  

• Config: Use @dataclass for configuration objects if args > 4.
• Env Block: Reject os.environ or os.getenv anywhere except main.py.

Golang Implementation

• Interfaces: Define type Service interface for all dependencies.
• Config: Use strict structs for config.
• Env Block: Reject os.Getenv anywhere except main.go.
• Forbidden: Do not use struct pointers for dependencies; use interfaces.

.NET / C# Implementation

• Interfaces: Use IInterface prefix.
• Config: Use IOptions<T> pattern or simple POCO config objects.
• Env Block: Reject Environment.GetEnvironmentVariable anywhere except Program.cs.

3. Enforcement Checklist

Before saving any file, verify:

1. Is the file < 500 lines?
2. Does the constructor have dependencies passed as Interfaces?
3. Are there 0 calls to env var readers?
4. Are there 0 default arguments?