def build_single_function_definition()

in samcli/lib/build/build_strategy.py [0:0]

• 48 lines of code
• 11 McCabe index (conditional complexity)

    def build_single_function_definition(self, build_definition: FunctionBuildDefinition) -> Dict[str, str]:
        """
        Builds single function definition with caching
        """
        if build_definition.packagetype == IMAGE:
            return self._delegate_build_strategy.build_single_function_definition(build_definition)

        code_dir = str(pathlib.Path(self._base_dir, cast(str, build_definition.codeuri)).resolve())
        source_hash = dir_checksum(code_dir, ignore_list=[".aws-sam"], hash_generator=hashlib.sha256())
        cache_function_dir = pathlib.Path(self._cache_dir, build_definition.uuid)
        function_build_results = {}

        if not cache_function_dir.exists() or build_definition.source_hash != source_hash:
            LOG.info(
                "Cache is invalid, running build and copying resources for following functions (%s)",
                build_definition.get_resource_full_paths(),
            )
            build_result = self._delegate_build_strategy.build_single_function_definition(build_definition)
            function_build_results.update(build_result)

            if cache_function_dir.exists():
                shutil.rmtree(str(cache_function_dir))

            build_definition.source_hash = source_hash
            # Since all the build contents are same for a build definition, just copy any one of them into the cache
            for _, value in build_result.items():
                osutils.copytree(value, str(cache_function_dir))
                break
        else:
            LOG.info(
                "Valid cache found, copying previously built resources for following functions (%s)",
                build_definition.get_resource_full_paths(),
            )
            if is_experimental_enabled(ExperimentalFlag.BuildPerformance):
                first_function_artifacts_dir: Optional[str] = None
                for function in build_definition.functions:
                    if not first_function_artifacts_dir:
                        # artifacts directory will be created by the builder
                        artifacts_dir = build_definition.get_build_dir(self._build_dir)
                        LOG.debug("Linking artifacts from %s to %s", cache_function_dir, artifacts_dir)
                        osutils.create_symlink_or_copy(str(cache_function_dir), artifacts_dir)
                        function_build_results[function.full_path] = artifacts_dir
                        first_function_artifacts_dir = artifacts_dir
                    else:
                        LOG.debug(
                            "Function (%s) build folder is updated to %s",
                            function.full_path,
                            first_function_artifacts_dir,
                        )
                        function_build_results[function.full_path] = first_function_artifacts_dir
            else:
                for function in build_definition.functions:
                    # artifacts directory will be created by the builder
                    artifacts_dir = function.get_build_dir(self._build_dir)
                    LOG.debug("Copying artifacts from %s to %s", cache_function_dir, artifacts_dir)
                    osutils.copytree(str(cache_function_dir), artifacts_dir)
                    function_build_results[function.full_path] = artifacts_dir

        return function_build_results