feat: unify dependencies

Signed-off-by: ThibaultFy <50656860+ThibaultFy@users.noreply.github.com>

CHANGELOG.md

@@ -7,6 +7,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## \[Unreleased\]
 
+- Check the Python version used before generating the Dockerfile ([#155])(<https://github.com/Substra/substrafl/pull/155>)).
+- Python dependencies can be resolved using pip compile during function registration by setting `compile` to `True`
+  in the `Dependency` object ([#155])(<https://github.com/Substra/substrafl/pull/155>)).
+
+  ```py
+  Dependency(
+        pypi_dependencies=["pytest", "numpy"],
+        compile=True,
+    )
+  ```
+
+- `Dependency` objects are now computed at initialization in a cache directory, accessible through the `copy_compute_dir` method. The cache directory is deleted at the `Dependency` object deletion. ([#155])(<https://github.com/Substra/substrafl/pull/155>))
+- BREAKING: local_installable_dependencies are now limited to local modules or Python wheels (no support for bdist, sdist...)([#155])(<https://github.com/Substra/substrafl/pull/155>)).
+
 ### Changed
 
 - BREAKING: Rename `generate_wheel.py` to `manage_dependencies.py` ([#156](https://github.com/Substra/substrafl/pull/156))

benchmark/camelyon/workflows.py

@@ -91,6 +91,7 @@ def substrafl_fed_avg(
         local_code=[base / "common", base / "weldon_fedavg.py"],
         # Keeping editable_mode=True to ensure nightly test benchmarks are ran against main substrafl git ref
         editable_mode=True,
+        compile=True,
     )
 
     # Custom Strategy used for the data loading (from custom_torch_function.py file)

docs/conf.py

@@ -193,6 +193,8 @@
     ("py:class", "substra.sdk.schemas.FunctionOutputSpec"),
     ("py:class", "substra.sdk.schemas.FunctionInputSpec"),
     ("py:class", "ComputePlan"),
+    ("py:class", "Path"),
+    ("py:class", "module"),
 ]
 
 html_css_files = [

setup.py

@@ -49,6 +49,7 @@
         "wheel",
         "six",
         "packaging",
+        "pip-tools",
     ],
     extras_require={
         "dev": [

substrafl/constants.py

@@ -1 +1,2 @@
 TMP_SUBSTRAFL_PREFIX = "tmp_substrafl"
+SUBSTRAFL_FOLDER = "substrafl_internal"

substrafl/dependency/manage_dependencies.py

@@ -1,50 +1,94 @@
 """
-Generate wheels for the Substra algo.
+Utility functions to manage dependencies (building wheels, compiling requirement...)
 """
 import logging
+import os
+import re
 import shutil
 import subprocess
 import sys
 from pathlib import Path
+from pathlib import PurePosixPath
+from types import ModuleType
 from typing import List
+from typing import Union
+
+from substrafl.exceptions import InvalidDependenciesError
+from substrafl.exceptions import InvalidUserModuleError
 
 logger = logging.getLogger(__name__)
 
 LOCAL_WHEELS_FOLDER = Path.home() / ".substrafl"
 
 
-def local_lib_wheels(lib_modules: List, *, operation_dir: Path, python_major_minor: str, dest_dir: str) -> str:
-    """Prepares the private modules from lib_modules list to be installed in a Docker image and generates the
-    appropriated install command for a dockerfile. It first creates the wheel for each library. Each of the
-    libraries must be already installed in the correct version locally. Use command:
-    ``pip install -e library-name`` in the directory of each library.
+def build_user_dependency_wheel(lib_path: Path, dest_dir: Path) -> str:
+    """Build the wheel for user dependencies passed as a local module.
+    Delete the local module when the build is done.
+
+    Args:
+        lib_path (Path): where the module is located.
+        dest_dir (Path): where the wheel needs to be copied.
+
+    Returns:
+        str: the filename of the wheel
+    """
+    # sys.executable takes the current Python interpreter instead of the default one on the computer
+    try:
+        ret = subprocess.run(
+            [
+                sys.executable,
+                "-m",
+                "pip",
+                "wheel",
+                str(lib_path) + os.sep,
+                "--no-deps",
+            ],
+            cwd=str(dest_dir),
+            check=True,
+            capture_output=True,
+            text=True,
+        )
+
+        # Delete the folder when the wheel is computed
+        shutil.rmtree(dest_dir / lib_path)  # delete directory
+    except subprocess.CalledProcessError as e:
+        raise InvalidUserModuleError from e
+    wheel_name = re.findall(r"filename=(\S*)", ret.stdout)[0]
+
+    return wheel_name
+
+
+def local_lib_wheels(lib_modules: List[ModuleType], *, dest_dir: Path) -> List[str]:
+    """Generate wheels for the private modules from lib_modules list and returns the list of names for each wheel.
+
+     It first creates the wheel for each library. Each of the libraries must be already installed in the correct
+     version locally. Use command: ``pip install -e library-name`` in the directory of each library.
+     Then it copies the wheels to the given directory.
 
     This allows one user to use custom version of the passed modules.
 
     Args:
         lib_modules (list): list of modules to be installed.
-        operation_dir (pathlib.Path): Path to the operation directory
-        python_major_minor (str): version which is to be used in the dockerfile. Eg: '3.8'
         dest_dir (str): relative directory where the wheels are saved
 
     Returns:
-        str: dockerfile command for installing the given modules
+        List[str]: wheel names for the given modules
     """
-    install_cmds = []
-    wheels_dir = operation_dir / dest_dir
-    wheels_dir.mkdir(exist_ok=True, parents=True)
+    wheel_names = []
+    dest_dir.mkdir(exist_ok=True, parents=True)
     for lib_module in lib_modules:
-        if not (Path(lib_module.__file__).parents[1] / "setup.py").exists():
+        lib_path = Path(lib_module.__file__).parents[1]
+        # this function is in practice only called on substra libraries, and we know we use a setup.py
+        if not (lib_path / "setup.py").exists():
             msg = ", ".join([lib.__name__ for lib in lib_modules])
             raise NotImplementedError(
                 f"You must install {msg} in editable mode.\n" "eg `pip install -e substra` in the substra directory"
             )
         lib_name = lib_module.__name__
-        lib_path = Path(lib_module.__file__).parents[1]
         wheel_name = f"{lib_name}-{lib_module.__version__}-py3-none-any.whl"
 
         wheel_path = LOCAL_WHEELS_FOLDER / wheel_name
-        # Recreate the wheel only if it does not exist
+        # Recreate the wheel only if it does not exist
         if wheel_path.exists():
             logger.warning(
                 f"Existing wheel {wheel_path} will be used to build {lib_name}. "
@@ -54,14 +98,14 @@ def local_lib_wheels(lib_modules: List, *, operation_dir: Path, python_major_min
         else:
             # if the right version of substra or substratools is not found, it will search if they are already
             # installed in 'dist' and take them from there.
-            # sys.executable takes the Python interpreter run by the code and not the default one on the computer
-            extra_args: list = list()
+            # sys.executable takes the current Python interpreter instead of the default one on the computer
+            extra_args: list = []
             if lib_name == "substrafl":
                 extra_args = [
                     "--find-links",
-                    operation_dir / "dist/substra",
+                    dest_dir.parent / "substra",
                     "--find-links",
-                    operation_dir / "dist/substratools",
+                    dest_dir.parent / "substratools",
                 ]
             subprocess.check_output(
                 [
@@ -78,65 +122,88 @@ def local_lib_wheels(lib_modules: List, *, operation_dir: Path, python_major_min
                 cwd=str(lib_path),
             )
 
-        shutil.copy(wheel_path, wheels_dir / wheel_name)
+        shutil.copy(wheel_path, dest_dir / wheel_name)
+        wheel_names.append(wheel_name)
 
-        # Necessary command to install the wheel in the docker image
-        force_reinstall = "--force-reinstall " if lib_name in ["substratools", "substra"] else ""
-        install_cmd = (
-            f"COPY {dest_dir}/{wheel_name} . \n"
-            + f"RUN python{python_major_minor} -m pip install {force_reinstall}{wheel_name}\n"
-        )
-        install_cmds.append(install_cmd)
+    return wheel_names
 
-    return "\n".join(install_cmds)
 
-
-def pypi_lib_wheels(lib_modules: List, *, operation_dir: Path, python_major_minor: str, dest_dir: str) -> str:
-    """Retrieves lib_modules' wheels to be installed in a Docker image and generates
-    the appropriated install command for a dockerfile.
+def get_pypi_dependencies_versions(lib_modules: List) -> List[str]:
+    """Retrieve the version of the PyPI libraries installed to generate the dependency list
 
     Args:
         lib_modules (list): list of modules to be installed.
-        operation_dir (pathlib.Path): Path to the operation directory
-        python_major_minor (str): version which is to be used in the dockerfile. Eg: '3.8'
-        dest_dir (str): relative directory where the wheels are saved
 
     Returns:
-        str: dockerfile command for installing the given modules
+        list(str): list of dependencies to install in the Docker container
     """
-    install_cmds = []
-    wheels_dir = operation_dir / dest_dir
-    wheels_dir.mkdir(exist_ok=True, parents=True)
+    return [f"{lib_module.__name__}=={lib_module.__version__}" for lib_module in lib_modules]
 
-    LOCAL_WHEELS_FOLDER.mkdir(exist_ok=True)
 
-    for lib_module in lib_modules:
-        wheel_name = f"{lib_module.__name__}-{lib_module.__version__}-py3-none-any.whl"
+def write_requirements(dependency_list: List[Union[str, Path]], *, dest_dir: Path) -> None:
+    """Writes down a `requirements.txt` file with the list of explicit dependencies.
 
-        # Download only if exists
-        if not ((LOCAL_WHEELS_FOLDER / wheel_name).exists()):
-            subprocess.check_output(
-                [
-                    sys.executable,
-                    "-m",
-                    "pip",
-                    "download",
-                    "--only-binary",
-                    ":all:",
-                    "--python-version",
-                    python_major_minor,
-                    "--no-deps",
-                    "--implementation",
-                    "py",
-                    "-d",
-                    LOCAL_WHEELS_FOLDER,
-                    f"{lib_module.__name__}=={lib_module.__version__}",
-                ]
-            )
+    Args:
+        dependency_list: list of dependencies to install; acceptable formats are library names (eg "substrafl"),
+            any constraint expression accepted by pip("substrafl==0.36.0" or "substrafl < 1.0") or wheel names
+            ("substrafl-0.36.0-py3-none-any.whl")
+        dest_dir: path to the directory where to write the ``requirements.txt``.
+    """
+    requirements_txt = dest_dir / "requirements.txt"
 
-        # Get wheel name based on current version
-        shutil.copy(LOCAL_WHEELS_FOLDER / wheel_name, wheels_dir / wheel_name)
-        install_cmd = f"COPY {dest_dir}/{wheel_name} . \n RUN python{python_major_minor} -m pip install {wheel_name}\n"
-        install_cmds.append(install_cmd)
+    _write_requirements_file(dependency_list=dependency_list, file=requirements_txt)
 
-    return "\n".join(install_cmds)
+
+def compile_requirements(dependency_list: List[Union[str, Path]], *, dest_dir: Path) -> None:
+    """Compile a list of requirements using pip-compile to generate a set of fully pinned third parties requirements
+
+    Writes down a `requirements.in` file with the list of explicit dependencies, then generates a `requirements.txt`
+    file using pip-compile. The `requirements.txt` file contains a set of fully pinned dependencies, including indirect
+    dependencies.
+
+    Args:
+        dependency_list: list of dependencies to install; acceptable formats are library names (eg "substrafl"),
+            any constraint expression accepted by pip("substrafl==0.36.0" or "substrafl < 1.0") or wheel names
+            ("substrafl-0.36.0-py3-none-any.whl")
+        dest_dir: path to the directory where to write the ``requirements.in`` and ``requirements.txt``.
+
+    Raises:
+        InvalidDependenciesError: if pip-compile does not find a set of compatible dependencies
+
+    """
+    requirements_in = dest_dir / "requirements.in"
+
+    _write_requirements_file(dependency_list=dependency_list, file=requirements_in)
+
+    command = [
+        sys.executable,
+        "-m",
+        "piptools",
+        "compile",
+        "--resolver=backtracking",
+        str(requirements_in),
+    ]
+    try:
+        logger.info("Compiling dependencies.")
+        subprocess.run(
+            command,
+            cwd=dest_dir,
+            check=True,
+            capture_output=True,
+            text=True,
+        )
+    except subprocess.CalledProcessError as e:
+        raise InvalidDependenciesError(
+            f"Error in command {' '.join(command)}\nstdout: {e.stdout}\nstderr: {e.stderr}"
+        ) from e
+
+
+def _write_requirements_file(dependency_list: List[Union[str, Path]], *, file: Path) -> None:
+    requirements = ""
+    for dependency in dependency_list:
+        if str(dependency).endswith(".whl"):
+            # Require '/', even on windows. The double conversion resolves that.
+            requirements += f"file:{PurePosixPath(Path(dependency))}\n"
+        else:
+            requirements += f"{dependency}\n"
+    file.write_text(requirements)