# ------------------------------------------------------------------------
# Copyright 2015 Intel Corporation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ------------------------------------------------------------------------

##########################################
#       Build BLE adapter for Linux
##########################################

Import('env')

import os.path

# Top-level build (variant) directory.
root_build_dir = env['BUILD_DIR']

# Source node that allows us to easily obtain paths and directories
# related to this source directory.
src_node = File(SConscript).Dir(os.curdir).srcnode()

# Absolute path of the source directory.
this_src_dir = src_node.abspath

# Build (variant) directory corresponding to this source directory.
this_build_dir = os.path.join(root_build_dir, src_node.path)

# The Linux BLE transport exports its GATT and LE advertisement
# related D-Bus interfaces to the D-Bus system bus so that they may be
# accessed by BlueZ.  Set the bus names here, i.e. in one place, to
# avoid potential mismatches, and generate the D-Bus policy
# configuration file and related C preprocessor symbol definitions.
service_name = '\"org.iotivity.gatt.service\"'

dbus_policy_in = 'org.iotivity.gatt.service.conf.in'

conf_dict = {}
subst_env = env.Clone(tools = [ 'default', 'textfile' ],
                      SUBST_DICT = conf_dict)

conf_dict = { '@service_name@' : service_name }

subst_env.Substfile(dbus_policy_in, SUBST_DICT = conf_dict)

# The resulting D-Bus policy file should go in to the appropriate
# D-Bus configuration directory, such as /etc/dbus-1/system.d/.

dbus_policy    = os.path.splitext(dbus_policy_in)[0]  # Drop '.in' extension.
generated_dbus_policy = os.path.join(this_build_dir, dbus_policy)
env.Clean(dbus_policy, generated_dbus_policy)

# Define the D-Bus bus name as a preprocessor symbol.  Note the
# multiple quote levels to ensure that the double quotes surrounding
# the string are included as part of the preprocess symbol.
#
# Also add a minimum required version of GLib 2.32, which is what the
# older GNU/Linux distributions supported by IoTivity shipped with.
env.AppendUnique(
    CPPDEFINES = [
        ('CA_DBUS_GATT_SERVICE_NAME', "'%s'" % service_name),
        ('GLIB_VERSION_MIN_REQUIRED', 'GLIB_VERSION_2_32')
    ])

# The Linux BLE adapter implementation uses GDBus to make D-Bus based
# method calls to BlueZ.  Pull in the necessary dependencies.
env.ParseConfig("pkg-config gio-unix-2.0 --cflags --libs")

# Set up commands to generate GDBus code from the D-Bus introspection
# XML.
freedesktop_prefix = 'org.freedesktop.DBus.'
bluez_prefix = 'org.bluez.'

dbus_introspection_xml = {
    'object_manager' : freedesktop_prefix,
    'bluez'          : bluez_prefix,
}

# The source files to be compiled as part of the connectivity
# abstraction library.
src_files = [ 'characteristic.c',
              'descriptor.c',
              'service.c',
              'advertisement.c',
              'utils.c',
              'central.c',
              'peripheral.c',
              'client.c',
              'server.c',
              'recv.c',
              'caleinterface.c'
          ]

glue_files = []

for file, prefix in dbus_introspection_xml.items():
    source_xml  = file + '.xml'
    glue        = file + '-glue'
    glue_source = glue + '.c'
    glue_header = glue + '.h'

    glue_files.append(glue_source)

    # Generate GDBus skeletons in the variant (build) directory.
    #
    # A link to the generated GDBus glue header is also created in the
    # source directory to avoid having to explicitly add the variant
    # directory to the preprocessor include path.
    targets     = [ glue_source, glue_header ]
    glue_header_gen  = os.path.join(this_build_dir, glue_header)
    glue_header_copy = os.path.join(this_src_dir, glue_header)

    gen = env.Command(targets,
                      source_xml,
                      'cd %s '
                      '&& gdbus-codegen --generate-c-code %s '
                      '   --interface-prefix %s ${SOURCE.abspath} '
                      '&& ln -sf %s %s '
                      '&& cd -'
                      % (this_build_dir,
                         glue, prefix,
                         glue_header_gen, glue_header_copy))

    # Mark generated file for cleaning when running "scons -c".
    for target in targets:
        generated_target = os.path.join(this_build_dir, target)
        env.Clean(target, generated_target)

    env.Clean(glue_source, glue_header_copy)

    # Force a dependency on copied glue header to make sure it exists
    # before compilation of the non-generated source files begins.
    env.Depends(src_files, gen)

src_files += glue_files

Return('src_files')


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