chore: fetch and store ODCS compose

Adds a method to pull and store ODCS compose.

Signed-off-by: Omer <[email protected]>

Pipfile

@@ -11,8 +11,11 @@ black = "*"
 mypy = "*"
 pylint = "*"
 isort = "*"
+pre-commit = "*"
+responses = "*"
 
 [dev-packages]
+pytest = "*"
 
 [requires]
 python_version = "3.11"

compose_generator/odcs_fetcher.py

@@ -1,7 +1,12 @@
 """Fetch ready ODCS compose"""
+import tempfile
 from dataclasses import dataclass
 from pathlib import Path
+from typing import Optional
 
+import requests  # type: ignore
+
+from .odcs_requester import ODCSRequestReference
 from .protocols import ComposeFetcher, ComposeReference
 
 
@@ -20,5 +25,35 @@ class ODCSFetcher(ComposeFetcher):
     Fetch ODCS compose based on a remote compose-reference and store it locally
     """
 
+    compose_path: Optional[Path] = None
+
     def __call__(self, request_reference: ComposeReference) -> ODCSResultReference:
-        raise NotImplementedError()
+        """
+        Fetch the ODCS compose from a remote reference.
+
+        :param request_reference: object containing the url reference for the ODCS compose file.
+
+        :raises HTTPError: If the request for the ODCS compose file failed.
+        :return: The filesystem path to the downloaded ODCS compose file.
+        """
+        compose_path = self._get_compose_destination_path()
+
+        assert isinstance(request_reference, ODCSRequestReference)
+        response = requests.get(request_reference.compose_url, timeout=30)  ####
+        response.raise_for_status()
+
+        with open(compose_path, "wb") as file:
+            file.write(response.content)
+        ocds_result_ref = ODCSResultReference(compose_path=compose_path)
+        return ocds_result_ref
+
+    def _get_compose_destination_path(self) -> Path:
+        """Return the compose file destination and creates it if it does
+        not already exist.
+
+        :return: the Path to the compose file.
+        """
+        compose_path = self.compose_path or Path(tempfile.mkdtemp())
+        compose_path.mkdir(parents=True, exist_ok=True)
+        compose_path = compose_path / "ocds_compose.repo"
+        return compose_path

tests/conftest.py

@@ -0,0 +1,12 @@
+"""conftest.py - Common pytest fixtures
+"""
+import tempfile
+from pathlib import Path
+
+import pytest
+
+
+@pytest.fixture
+def tmpdir() -> Path:
+    """Creates a tmporary directory and return its path"""
+    return Path(tempfile.mkdtemp())