CI: download libev via conan, for windows builds to have it

windows builds so far was running with having libev available
and until this sync the fallback for python 3.12 was asyncio
eventloop, but now we fail and not fall back to asyncio.
so all unittest on windows are failing on any import from
cassandra.connection.

in this change we use conan to download libev, and using
it to compile the driver with libev

Ref: https://conan.io/center/recipes/libev

Author: fruch

.github/workflows/build-push.yml

@@ -11,6 +11,7 @@ env:
  CIBW_BEFORE_BUILD_LINUX: "rm -rf ~/.pyxbld && yum install -y libffi-devel libev libev-devel openssl openssl-devel"
  CIBW_ENVIRONMENT: "CASS_DRIVER_BUILD_CONCURRENCY=2 CFLAGS='-g0 -O3'"
  CIBW_SKIP: cp35* cp36* *musllinux*
+ CIBW_BUILD_VERBOSITY: 3
 
 jobs:
   build_wheels:
@@ -65,6 +66,16 @@ jobs:
         run: |
           choco install openssl --version=3.3.1 -f -y
 
+      - name: Install Conan
+        if: runner.os == 'Windows'
+        uses: turtlebrowser/get-conan@main
+
+      - name: configure libev for Windows
+        if: runner.os == 'Windows'
+        run: |
+          conan profile detect
+          conan install conanfile.py
+
       - name: Install OpenSSL for MacOS
         if: runner.os == 'MacOs'
         run: |

MANIFEST.in

@@ -4,3 +4,4 @@ include cassandra/io/libevwrapper.c
 include cassandra/*.pyx
 include cassandra/*.pxd
 include cassandra/*.h
+graft build-release

conanfile.py

@@ -0,0 +1,57 @@
+import json
+from pathlib import Path
+
+from conan import ConanFile
+from conan.tools.layout import basic_layout
+from conan.internal import check_duplicated_generator
+from conan.tools.files import save
+
+
+CONAN_COMMANDLINE_FILENAME = "conandeps.env"
+
+class CommandlineDeps:
+    def __init__(self, conanfile):
+        """
+        :param conanfile: ``< ConanFile object >`` The current recipe object. Always use ``self``.
+        """
+        self._conanfile = conanfile
+
+    def generate(self) -> None:
+        """
+        Collects all dependencies and components, then, generating a Makefile
+        """
+        check_duplicated_generator(self, self._conanfile)
+
+        host_req = self._conanfile.dependencies.host
+        build_req = self._conanfile.dependencies.build  # tool_requires
+        test_req = self._conanfile.dependencies.test
+
+        content_buffer = ""
+
+        # Filter the build_requires not activated for any requirement
+        dependencies = [tup for tup in list(host_req.items()) + list(build_req.items()) + list(test_req.items()) if not tup[0].build]
+
+        for require, dep in dependencies:
+            # Require is not used at the moment, but its information could be used, and will be used in Conan 2.0
+            if require.build:
+                continue
+            include_dir = Path(dep.package_folder) / 'include'
+            package_dir = Path(dep.package_folder) / 'lib'
+            content_buffer += json.dumps(dict(include_dirs=str(include_dir), library_dirs=str(package_dir)))
+
+        save(self._conanfile, CONAN_COMMANDLINE_FILENAME, content_buffer)
+        self._conanfile.output.info(f"Generated {CONAN_COMMANDLINE_FILENAME}")
+
+
+class python_driverConan(ConanFile):
+    win_bash = False
+
+    settings = "os", "compiler", "build_type", "arch"
+    requires = "libev/4.33"
+
+    def layout(self):
+        basic_layout(self)
+
+    def generate(self):
+        pc = CommandlineDeps(self)
+        pc.generate()

setup.py

@@ -15,7 +15,9 @@
 from __future__ import print_function
 import os
 import sys
+import json
 import warnings
+from pathlib import Path
 
 if __name__ == '__main__' and sys.argv[1] == "gevent_nosetests":
     print("Running gevent tests")
@@ -149,6 +151,13 @@ def __init__(self, ext):
 if is_macos:
     libev_includes.extend(['/opt/homebrew/include', os.path.expanduser('~/homebrew/include')])
     libev_libdirs.extend(['/opt/homebrew/lib'])
+
+conan_envfile = Path(__file__).parent / 'build-release/conan/conandeps.env'
+if conan_envfile.exists():
+    conan_paths = json.loads(conan_envfile.read_text())
+    libev_includes.extend([conan_paths.get('include_dirs')])
+    libev_libdirs.extend([conan_paths.get('library_dirs')])
+
 libev_ext = Extension('cassandra.io.libevwrapper',
                       sources=['cassandra/io/libevwrapper.c'],
                       include_dirs=libev_includes,
@@ -189,7 +198,7 @@ def __init__(self, ext):
 
 try_extensions = "--no-extensions" not in sys.argv and is_supported_platform and is_supported_arch and not os.environ.get('CASS_DRIVER_NO_EXTENSIONS')
 try_murmur3 = try_extensions and "--no-murmur3" not in sys.argv
-try_libev = try_extensions and "--no-libev" not in sys.argv and not is_pypy and not is_windows
+try_libev = try_extensions and "--no-libev" not in sys.argv and not is_pypy
 try_cython = try_extensions and "--no-cython" not in sys.argv and not is_pypy and not os.environ.get('CASS_DRIVER_NO_CYTHON')
 try_cython &= 'egg_info' not in sys.argv  # bypass setup_requires for pip egg_info calls, which will never have --install-option"--no-cython" coming fomr pip