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121 lines
4.4 KiB
121 lines
4.4 KiB
"""Generates C++ grpc stubs from proto_library rules.
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This is an internal rule used by cc_grpc_library, and shouldn't be used
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directly.
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"""
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def generate_cc_impl(ctx):
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"""Implementation of the generate_cc rule."""
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protos = [f for src in ctx.attr.srcs for f in src.proto.direct_sources]
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includes = [f for src in ctx.attr.srcs for f in src.proto.transitive_imports]
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outs = []
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# label_len is length of the path from WORKSPACE root to the location of this build file
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label_len = 0
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# proto_root is the directory relative to which generated include paths should be
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proto_root = ""
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if ctx.label.package:
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# The +1 is for the trailing slash.
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label_len += len(ctx.label.package) + 1
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if ctx.label.workspace_root:
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label_len += len(ctx.label.workspace_root) + 1
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proto_root = "/" + ctx.label.workspace_root
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if ctx.executable.plugin:
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outs += [proto.path[label_len:-len(".proto")] + ".grpc.pb.h" for proto in protos]
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outs += [proto.path[label_len:-len(".proto")] + ".grpc.pb.cc" for proto in protos]
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if ctx.attr.generate_mocks:
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outs += [proto.path[label_len:-len(".proto")] + "_mock.grpc.pb.h" for proto in protos]
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else:
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outs += [proto.path[label_len:-len(".proto")] + ".pb.h" for proto in protos]
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outs += [proto.path[label_len:-len(".proto")] + ".pb.cc" for proto in protos]
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out_files = [ctx.new_file(out) for out in outs]
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dir_out = str(ctx.genfiles_dir.path + proto_root)
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arguments = []
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if ctx.executable.plugin:
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arguments += ["--plugin=protoc-gen-PLUGIN=" + ctx.executable.plugin.path]
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flags = list(ctx.attr.flags)
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if ctx.attr.generate_mocks:
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flags.append("generate_mock_code=true")
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arguments += ["--PLUGIN_out=" + ",".join(flags) + ":" + dir_out]
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additional_input = [ctx.executable.plugin]
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else:
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arguments += ["--cpp_out=" + ",".join(ctx.attr.flags) + ":" + dir_out]
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additional_input = []
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# Import protos relative to their workspace root so that protoc prints the
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# right include paths.
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for include in includes:
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directory = include.path
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if directory.startswith("external"):
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external_sep = directory.find("/")
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repository_sep = directory.find("/", external_sep + 1)
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arguments += ["--proto_path=" + directory[:repository_sep]]
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else:
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arguments += ["--proto_path=."]
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# Include the output directory so that protoc puts the generated code in the
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# right directory.
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arguments += ["--proto_path={0}{1}".format(dir_out, proto_root)]
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arguments += [proto.path for proto in protos]
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# create a list of well known proto files if the argument is non-None
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well_known_proto_files = []
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if ctx.attr.well_known_protos:
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f = ctx.attr.well_known_protos.files.to_list()[0].dirname
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if f != "external/com_google_protobuf/src/google/protobuf":
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print("Error: Only @com_google_protobuf//:well_known_protos is supported")
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else:
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# f points to "external/com_google_protobuf/src/google/protobuf"
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# add -I argument to protoc so it knows where to look for the proto files.
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arguments += ["-I{0}".format(f + "/../..")]
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well_known_proto_files = [f for f in ctx.attr.well_known_protos.files]
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ctx.action(
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inputs = protos + includes + additional_input + well_known_proto_files,
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outputs = out_files,
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executable = ctx.executable._protoc,
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arguments = arguments,
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)
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return struct(files=depset(out_files))
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_generate_cc = rule(
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attrs = {
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"srcs": attr.label_list(
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mandatory = True,
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non_empty = True,
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providers = ["proto"],
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),
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"plugin": attr.label(
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executable = True,
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providers = ["files_to_run"],
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cfg = "host",
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),
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"flags": attr.string_list(
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mandatory = False,
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allow_empty = True,
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),
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"well_known_protos" : attr.label(
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mandatory = False,
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),
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"generate_mocks" : attr.bool(
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default = False,
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mandatory = False,
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),
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"_protoc": attr.label(
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default = Label("//external:protocol_compiler"),
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executable = True,
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cfg = "host",
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),
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},
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# We generate .h files, so we need to output to genfiles.
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output_to_genfiles = True,
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implementation = generate_cc_impl,
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)
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def generate_cc(well_known_protos, **kwargs):
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if well_known_protos:
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_generate_cc(well_known_protos="@com_google_protobuf//:well_known_protos", **kwargs)
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else:
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_generate_cc(**kwargs)
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