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Diffstat (limited to 'grpc.bzl')
| -rw-r--r-- | grpc.bzl | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/grpc.bzl b/grpc.bzl new file mode 100644 index 0000000000..9f2693126a --- /dev/null +++ b/grpc.bzl @@ -0,0 +1,128 @@ +# Copyright 2015, Google Inc. +# All rights reserved. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions are +# met: +# +# * Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# * Redistributions in binary form must reproduce the above +# copyright notice, this list of conditions and the following disclaimer +# in the documentation and/or other materials provided with the +# distribution. +# * Neither the name of Google Inc. nor the names of its +# contributors may be used to endorse or promote products derived from +# this software without specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +""" +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 += [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 command line to invoke protoc from a genrule, on the given + sources, using the given flags. + """ + protoc_command = "$(location //external:protoc) -I . " + srcs_params = "" + for src in srcs: + srcs_params += " $(location %s)" % (src) + return protoc_command + flags + srcs_params + +def objc_proto_library(name, srcs, visibility=None): + """Declares an objc_library for the code generated by protoc from the given + proto sources. This generated code doesn't include proto services. + """ + h_files = [] + m_files = [] + for src in srcs: + src = _file_to_upper_camel(src) + h_files += [_file_with_extension(src, ".pbobjc.h")] + m_files += [_file_with_extension(src, ".pbobjc.m")] + + protoc_flags = "--objc_out=$(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 gRPC and protoc from the + given proto sources (services and other_messages). The generated code doesn't + include proto services of the files passed as other_messages. + """ + objc_proto_library(name + "_messages", services + other_messages) + + h_files = [] + m_files = [] + for src in services: + src = _file_to_upper_camel(src) + h_files += [_file_with_extension(src, ".pbrpc.h")] + m_files += [_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, + ) |