1# Copyright 2015 gRPC authors. 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# http://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14 15""" 16Bazel macros to declare gRPC libraries automatically generated from proto files. 17 18This file declares two macros: 19- objc_proto_library 20- objc_grpc_library 21""" 22 23def _lower_underscore_to_upper_camel(str): 24 humps = [] 25 for hump in str.split('_'): 26 humps += [hump[0].upper() + hump[1:]] 27 return "".join(humps) 28 29def _file_to_upper_camel(src): 30 elements = src.rpartition('/') 31 upper_camel = _lower_underscore_to_upper_camel(elements[-1]) 32 return "".join(elements[:-1] + [upper_camel]) 33 34def _file_with_extension(src, ext): 35 elements = src.rpartition('/') 36 basename = elements[-1].partition('.')[0] 37 return "".join(elements[:-1] + [basename, ext]) 38 39def _protoc_invocation(srcs, flags): 40 """Returns a command line to invoke protoc from a genrule, on the given 41 sources, using the given flags. 42 """ 43 protoc_command = "$(location //external:protoc) -I . " 44 srcs_params = "" 45 for src in srcs: 46 srcs_params += " $(location %s)" % (src) 47 return protoc_command + flags + srcs_params 48 49def objc_proto_library(name, srcs, visibility=None): 50 """Declares an objc_library for the code generated by protoc from the given 51 proto sources. This generated code doesn't include proto services. 52 """ 53 h_files = [] 54 m_files = [] 55 for src in srcs: 56 src = _file_to_upper_camel(src) 57 h_files += [_file_with_extension(src, ".pbobjc.h")] 58 m_files += [_file_with_extension(src, ".pbobjc.m")] 59 60 protoc_flags = "--objc_out=$(GENDIR)" 61 62 native.genrule( 63 name = name + "_codegen", 64 srcs = srcs + ["//external:protoc"], 65 outs = h_files + m_files, 66 cmd = _protoc_invocation(srcs, protoc_flags), 67 ) 68 native.objc_library( 69 name = name, 70 hdrs = h_files, 71 includes = ["."], 72 non_arc_srcs = m_files, 73 deps = ["//external:protobuf_objc"], 74 visibility = visibility, 75 ) 76 77def objc_grpc_library(name, services, other_messages, visibility=None): 78 """Declares an objc_library for the code generated by gRPC and protoc from the 79 given proto sources (services and other_messages). The generated code doesn't 80 include proto services of the files passed as other_messages. 81 """ 82 objc_proto_library(name + "_messages", services + other_messages) 83 84 h_files = [] 85 m_files = [] 86 for src in services: 87 src = _file_to_upper_camel(src) 88 h_files += [_file_with_extension(src, ".pbrpc.h")] 89 m_files += [_file_with_extension(src, ".pbrpc.m")] 90 91 protoc_flags = ("--grpc_out=$(GENDIR) --plugin=" + 92 "protoc-gen-grpc=$(location //external:grpc_protoc_plugin_objc)") 93 94 native.genrule( 95 name = name + "_codegen", 96 srcs = services + [ 97 "//external:grpc_protoc_plugin_objc", 98 "//external:protoc", 99 ], 100 outs = h_files + m_files, 101 cmd = _protoc_invocation(services, protoc_flags), 102 ) 103 native.objc_library( 104 name = name, 105 hdrs = h_files, 106 includes = ["."], 107 srcs = m_files, 108 deps = [ 109 ":" + name + "_messages", 110 "//external:proto_objc_rpc", 111 ], 112 visibility = visibility, 113 ) 114