text: from conans import CMake, ConanFile, tools
  from conans.errors import ConanInvalidConfiguration
  import glob
  import os
  
  
  class GetDnsConan(ConanFile):
      name = "getdns"
      description = "A modern asynchronous DNS API"
      topics = "conan", "getdns", "asynchronous", "event"
      license = "BSD-3-Clause"
      homepage = "https://getdnsapi.net/"
      url = "https://github.com/conan-io/conan-center-index"
      settings = "os", "arch", "compiler", "build_type"
      exports_sources = "CMakeLists.txt", "patches/**"
      options = {
          "shared": [True, False],
          "fPIC": [True, False],
          "tls": [False, "gnutls"],
          "stub_only": ["auto", True, False],
          "with_libev": ["auto", True, False],
          "with_libevent": [True, False],
          "with_libuv": [True, False],
          "with_libidn2": [True, False],
      }
      default_options = {
          "shared": False,
          "fPIC": True,
          "stub_only": "auto",
          "tls": False,
          "with_libev": "auto",
          "with_libevent": True,
          "with_libuv": True,
          "with_libidn2": True,
      }
      generators = "cmake", "pkg_config", "cmake_find_package"
  
      _cmake = None
  
      @property
      def _with_libev(self):
          if self.options.with_libev == "auto":
              return self.settings.os != "Windows"
          else:
              return self.options.with_libev
  
      @property
      def _stub_only(self):
          if self.options.stub_only == "auto":
              # FIXME: uncomment the next line when libunbound is available
              # return self.settings.os == "Windows"
              return True
          else:
              return self.options.stub_only
  
      @property
      def _source_subfolder(self):
          return "source_subfolder"
  
      def config_options(self):
          if self.settings.os == "Windows":
              del self.options.fPIC
  
      def configure(self):
          if self.options.shared:
              del self.options.fPIC
          del self.settings.compiler.libcxx
          del self.settings.compiler.cppstd
  
      def requirements(self):
          self.requires("openssl/1.1.1h")
          if self._with_libev:
              self.requires("libev/4.33")
          if self.options.with_libevent:
              self.requires("libevent/2.1.12")
          if self.options.with_libuv:
              self.requires("libuv/1.38.1")
          if self.options.with_libidn2:
              self.requires("libidn2/2.3.0")
          if self.options.tls == "gnutls":
              self.requires("nettle/6.2")
              # FIXME: missing gnutls recipe
              raise ConanInvalidConfiguration("gnutls is not (yet) available on cci")
          if not self._stub_only:
              # FIXME: missing libunbound recipe
              raise ConanInvalidConfiguration("libunbound is not (yet) available on cci")
  
      def build_requirements(self):
          self.build_requires("pkgconf/1.7.3")
  
      def source(self):
          tools.get(**self.conan_data["sources"][self.version])
          os.rename("getdns-{}".format(self.version), self._source_subfolder)
  
      def _configure_cmake(self):
          if self._cmake:
              return self._cmake
          self._cmake = CMake(self)
          self._cmake.definitions["OPENSSL_USE_STATIC_LIBS"] = not self.options["openssl"].shared
          self._cmake.definitions["ENABLE_SHARED"] = self.options.shared
          self._cmake.definitions["ENABLE_STATIC"] = not self.options.shared
          self._cmake.definitions["ENABLE_STUB_ONLY"] = self._stub_only
          self._cmake.definitions["BUILD_LIBEV"] = self._with_libev
          self._cmake.definitions["BUILD_LIBEVENT2"] = self.options.with_libevent
          self._cmake.definitions["BUILD_LIBUV"] = self.options.with_libuv
          self._cmake.definitions["USE_LIBIDN2"] = self.options.with_libidn2
          self._cmake.definitions["USE_GNUTLS"] = self.options.tls == "gnutls"
          self._cmake.definitions["BUILD_TESTING"] = False
  
          self._cmake.configure()
          return self._cmake
  
      def build(self):
          for patch in self.conan_data.get("patches", {}).get(self.version, []):
              tools.patch(**patch)
          # Use FindOpenSSL.cmake to let check_function_exists succeed
          # Remove other cmake modules as they use FindPkgConfig
          for fn in glob.glob("Find*cmake"):
              if "OpenSSL" not in fn:
                  os.unlink(fn)
          cmake = self._configure_cmake()
          cmake.build()
  
      def package(self):
          self.copy("COPYING", src=self._source_subfolder, dst="licenses")
          cmake = self._configure_cmake()
          cmake.install()
  
          tools.rmdir(os.path.join(self.package_folder, "lib", "cmake"))
          tools.rmdir(os.path.join(self.package_folder, "lib", "pkgconfig"))
          tools.rmdir(os.path.join(self.package_folder, "share"))
  
      def package_id(self):
          self.info.options.stub_only = self._stub_only
          self.info.options.with_libev = self._with_libev
  
      def package_info(self):
          libsuffix = ""
          if self.settings.compiler == "Visual Studio" and not self.options.shared:
              libsuffix = "_static"
  
          self.cpp_info.components["libgetdns"].libs = ["getdns" + libsuffix]
          self.cpp_info.components["libgetdns"].includedirs.append(os.path.join("include", "getdns"))
          self.cpp_info.components["libgetdns"].names["pkg_config"]= "getdns"
          self.cpp_info.components["libgetdns"].requires = ["openssl::openssl"]
          if self.options.with_libidn2:
              self.cpp_info.components["libgetdns"].requires.append("libidn2::libidn2")
          if self.options.with_libidn2:
              self.cpp_info.components["libgetdns"].requires.append("libidn2::libidn2")
          if self.options.tls == "gnutls":
              self.cpp_info.components["libgetdns"].requires.extend(["nettle::nettle", "gnutls::gnutls"])
  
          if self.options.with_libevent:
              self.cpp_info.components["dns_ex_event"].libs = ["getdns_ex_event" + libsuffix]
              self.cpp_info.components["dns_ex_event"].requires= ["libgetdns", "libevent::libevent"]
              self.cpp_info.components["dns_ex_event"].names["pkg_config"]= "getdns_ext_event"
  
          if self._with_libev:
              self.cpp_info.components["dns_ex_ev"].libs = ["getdns_ex_ev" + libsuffix]
              self.cpp_info.components["dns_ex_ev"].requires = ["libgetdns", "libev::libev"]
              self.cpp_info.components["dns_ex_ev"].names["pkg_config"]= "getdns_ext_ev"
  
          if self.options.with_libuv:
              self.cpp_info.components["dns_ex_uv"].libs = ["getdns_ex_uv" + libsuffix]
              self.cpp_info.components["dns_ex_uv"].requires = ["libgetdns", "libuv::libuv"]
              self.cpp_info.components["dns_ex_uv"].names["pkg_config"]= "getdns_ext_uv"
  
          bin_path = os.path.join(self.package_folder, "bin")
          self.output.info("Appending PATH environment variable: {}".format(bin_path))
          self.env_info.PATH.append(bin_path)
  