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{ lib
, stdenv
, buildPythonPackage
, fetchPypi
, grpc
, six
, protobuf
, enum34 ? null
, futures ? null
, isPy27
, pkg-config
, cython
, c-ares
, openssl
, zlib
}:

buildPythonPackage rec {
  pname = "grpcio";
  format = "setuptools";
  version = "1.62.1";

  src = fetchPypi {
    inherit pname version;
    hash = "sha256-bEVeAI+obZ6anYW7dtpCd8DX2WaKO/pw2+hunzx1mUc=";
  };

  outputs = [ "out" "dev" ];

  nativeBuildInputs = [ cython pkg-config ];

  buildInputs = [ c-ares openssl zlib ];
  propagatedBuildInputs = [ six protobuf ]
    ++ lib.optionals (isPy27) [ enum34 futures ];

  preBuild = ''
    export GRPC_PYTHON_BUILD_EXT_COMPILER_JOBS="$NIX_BUILD_CORES"
    if [ -z "$enableParallelBuilding" ]; then
      GRPC_PYTHON_BUILD_EXT_COMPILER_JOBS=1
    fi
  '' + lib.optionalString stdenv.isDarwin ''
    unset AR
  '';

  GRPC_BUILD_WITH_BORING_SSL_ASM = "";
  GRPC_PYTHON_BUILD_SYSTEM_OPENSSL = 1;
  GRPC_PYTHON_BUILD_SYSTEM_ZLIB = 1;
  GRPC_PYTHON_BUILD_SYSTEM_CARES = 1;

  # does not contain any tests
  doCheck = false;

  enableParallelBuilding = true;

  pythonImportsCheck = [ "grpc" ];

  meta = with lib; {
    description = "HTTP/2-based RPC framework";
    license = licenses.asl20;
    homepage = "https://grpc.io/grpc/python/";
    maintainers = with maintainers; [ ];
  };
}