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# Copyright 2015 gRPC authors.
#
# 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.
"""
Bazel macros to declare gRPC libraries automatically generated from proto files.
This file declares two macros:
- objc_proto_library
- objc_grpc_library
"""
def _lower_underscore_to_upper_camel(str):
humps = []
for hump in str.split("_"):
humps.append(hump[0].upper() + hump[1:])
return "".join(humps)
def _file_to_upper_camel(src):
elements = src.rpartition("/")
upper_camel = _lower_underscore_to_upper_camel(elements[-1])
return "".join(elements[:-1] + [upper_camel])
def _file_with_extension(src, ext):
elements = src.rpartition("/")
basename = elements[-1].partition(".")[0]
return "".join(elements[:-1] + [basename, ext])
def _protoc_invocation(srcs, flags):
"""Returns a CLI command to invoke protoc.
Uses the given sources and flags. Suitable for use in a genrule.
"""
protoc_command = "$(location //external:protoc) -I . "
srcs_params = ""
for src in srcs:
srcs_params += " $(location %s)" % (src)
return protoc_command + flags + srcs_params
def objc_proto_library(name, srcs, visibility = None):
"""Declares an objc_library for the code generated by protoc.
Uses the given proto sources. This generated code doesn't include proto
services.
Args:
name: The name of the library.
srcs: A list of .proto file sources.
visibility: The visibility label to apply to the target.
"""
h_files = []
m_files = []
for src in srcs:
src = _file_to_upper_camel(src)
h_files.append(_file_with_extension(src, ".pbobjc.h"))
m_files.append(_file_with_extension(src, ".pbobjc.m"))
protoc_flags = "--objc_out=$(GENDIR)"
native.genrule(
name = name + "_codegen",
srcs = srcs + ["//external:protoc"],
outs = h_files + m_files,
cmd = _protoc_invocation(srcs, protoc_flags),
)
native.objc_library(
name = name,
hdrs = h_files,
includes = ["."],
non_arc_srcs = m_files,
deps = ["//external:protobuf_objc"],
visibility = visibility,
)
def objc_grpc_library(name, services, other_messages, visibility = None):
"""Declares an objc_library for the code generated by the gRPC ObjC plugin.
The generated code does not include the services of the files in other_messages.
Args:
name: The name of the library.
services: The .proto files from which to generate the library.
other_messages: A list of .proto files containing messages needed for the library.
visibility: The visibility label to apply to the library.
"""
objc_proto_library(name + "_messages", services + other_messages)
h_files = []
m_files = []
for src in services:
src = _file_to_upper_camel(src)
h_files.append(_file_with_extension(src, ".pbrpc.h"))
m_files.append(_file_with_extension(src, ".pbrpc.m"))
protoc_flags = ("--grpc_out=$(GENDIR) --plugin=" +
"protoc-gen-grpc=$(location //external:grpc_protoc_plugin_objc)")
native.genrule(
name = name + "_codegen",
srcs = services + [
"//external:grpc_protoc_plugin_objc",
"//external:protoc",
],
outs = h_files + m_files,
cmd = _protoc_invocation(services, protoc_flags),
)
native.objc_library(
name = name,
hdrs = h_files,
includes = ["."],
srcs = m_files,
deps = [
":" + name + "_messages",
"//external:proto_objc_rpc",
],
visibility = visibility,
)
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