resolvelib

import resolvelib from resolvelib.reporters import BaseReporter import os # Define simple data structures for our 'packages' and 'requirements' # In a real scenario, these would be richer objects (e.g., Package(name, version), Requirement(package_name, specifier)) class MyPackage: def __init__(self, name, version): self.name = name self.version = version def __repr__(self): return f'{self.name}=={self.version}' def __hash__(self): return hash((self.name, self.version)) def __eq__(self, other): return isinstance(other, MyPackage) and self.name == other.name and self.version == other.version class MyRequirement: def __init__(self, name, specifier): self.name = name self.specifier = specifier # e.g., '>=1.0', '<2.0' def __repr__(self): return f'{self.name}{self.specifier}' def __hash__(self): return hash((self.name, self.specifier)) def __eq__(self, other): return isinstance(other, MyRequirement) and self.name == other.name and self.specifier == other.specifier # Implement the Provider interface class MyProvider: def get_base_requirement(self, identifier): # For this simple example, we assume identifier is the package name # and we don't have a 'base' requirement beyond the initial ones. return None def identify(self, requirement_or_candidate): return requirement_or_candidate.name def get_preference(self, identifier, resolutions, candidates, information): # Prefer higher versions return len(candidates) + 1 # Dummy preference, real logic would sort candidates def get_dependencies(self, candidate): # Define dependencies for candidates if candidate.name == 'A' and candidate.version == '1.0': return [MyRequirement('B', '>=1.0')] if candidate.name == 'B' and candidate.version == '1.0': return [MyRequirement('C', '>=1.0')] return [] def get_candidates(self, requirement): # Return available candidates for a given requirement if requirement.name == 'A': yield MyPackage('A', '1.0') yield MyPackage('A', '2.0') elif requirement.name == 'B': yield MyPackage('B', '1.0') yield MyPackage('B', '1.1') elif requirement.name == 'C': yield MyPackage('C', '1.0') yield MyPackage('C', '1.2') else: return [] def is_satisfied_by(self, requirement, candidate): # In a real scenario, this would check if candidate.version satisfies requirement.specifier # For simplicity, we assume any candidate with the correct name satisfies a basic requirement return requirement.name == candidate.name # Create an instance of the provider and reporter provider = MyProvider() reporter = BaseReporter() # Create the resolver resolver = resolvelib.Resolver(provider, reporter) # Define the initial requirements requirements = [MyRequirement('A', '>=1.0')] # Kick off the resolution process try: result = resolver.resolve(requirements) print("Resolution successful:") for candidate in result.graph.iter_network_linear(): if isinstance(candidate, MyPackage): print(f" - {candidate}") except resolvelib.ResolutionImpossible as e: print(f"Resolution failed: {e}") # Example of getting an auth key, though not directly used by resolvelib api_key = os.environ.get('RESOLVELIB_API_KEY', 'your_default_or_mock_key') if api_key == 'your_default_or_mock_key': print("\nNote: For real-world use with external registries, an API key might be passed via Provider.") else: print(f"\nUsing API Key (first 5 chars): {api_key[:5]}...")