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# Copyright 2015, Google Inc.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following disclaimer
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# in the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of Google Inc. nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"""
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Bazel macros to declare gRPC libraries automatically generated from proto files.
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This file declares two macros:
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- objc_proto_library
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- objc_grpc_library
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"""
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def _lower_underscore_to_upper_camel(str):
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humps = []
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for hump in str.split('_'):
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humps += [hump[0].upper() + hump[1:]]
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return "".join(humps)
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def _file_to_upper_camel(src):
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elements = src.rpartition('/')
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upper_camel = _lower_underscore_to_upper_camel(elements[-1])
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return "".join(elements[:-1] + [upper_camel])
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def _file_with_extension(src, ext):
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elements = src.rpartition('/')
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basename = elements[-1].partition('.')[0]
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return "".join(elements[:-1] + [basename, ext])
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def _protoc_invocation(srcs, flags):
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"""Returns a command line to invoke protoc from a genrule, on the given
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sources, using the given flags.
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"""
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protoc_command = "$(location //external:protoc) -I . "
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srcs_params = ""
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for src in srcs:
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srcs_params += " $(location %s)" % (src)
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return protoc_command + flags + srcs_params
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def objc_proto_library(name, srcs, visibility=None):
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"""Declares an objc_library for the code generated by protoc from the given
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proto sources. This generated code doesn't include proto services.
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"""
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h_files = []
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m_files = []
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for src in srcs:
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src = _file_to_upper_camel(src)
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h_files += [_file_with_extension(src, ".pbobjc.h")]
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m_files += [_file_with_extension(src, ".pbobjc.m")]
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protoc_flags = "--objc_out=$(GENDIR)"
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native.genrule(
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name = name + "_codegen",
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srcs = srcs + ["//external:protoc"],
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outs = h_files + m_files,
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cmd = _protoc_invocation(srcs, protoc_flags),
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)
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native.objc_library(
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name = name,
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hdrs = h_files,
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includes = ["."],
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non_arc_srcs = m_files,
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deps = ["//external:protobuf_objc"],
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visibility = visibility,
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)
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def objc_grpc_library(name, services, other_messages, visibility=None):
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"""Declares an objc_library for the code generated by gRPC and protoc from the
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given proto sources (services and other_messages). The generated code doesn't
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include proto services of the files passed as other_messages.
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"""
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objc_proto_library(name + "_messages", services + other_messages)
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h_files = []
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m_files = []
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for src in services:
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src = _file_to_upper_camel(src)
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h_files += [_file_with_extension(src, ".pbrpc.h")]
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m_files += [_file_with_extension(src, ".pbrpc.m")]
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protoc_flags = ("--grpc_out=$(GENDIR) --plugin=" +
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"protoc-gen-grpc=$(location //external:grpc_protoc_plugin_objc)")
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native.genrule(
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name = name + "_codegen",
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srcs = services + [
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"//external:grpc_protoc_plugin_objc",
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"//external:protoc",
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],
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outs = h_files + m_files,
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cmd = _protoc_invocation(services, protoc_flags),
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)
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native.objc_library(
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name = name,
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hdrs = h_files,
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includes = ["."],
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srcs = m_files,
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deps = [
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":" + name + "_messages",
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"//external:proto_objc_rpc",
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],
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visibility = visibility,
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)
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