Initial checkin of gRPC to third_party/

third_party/grpc/grpc.bzl

Index: third_party/grpc/grpc.bzl
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+# 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,
+  )