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"""Generates and compiles C++ grpc stubs from proto_library rules."""
load("//:bazel/generate_cc.bzl", "generate_cc")
def cc_grpc_library(name, srcs, deps, proto_only, well_known_protos, use_external = False, **kwargs):
"""Generates C++ grpc classes from a .proto file.
Assumes the generated classes will be used in cc_api_version = 2.
Arguments:
name: name of rule.
srcs: a single proto_library, which wraps the .proto files with services.
deps: a list of C++ proto_library (or cc_proto_library) which provides
the compiled code of any message that the services depend on.
well_known_protos: The target from protobuf library that exports well
known protos. Currently it will only work if the value is
"@submodule_protobuf//:well_known_protos"
use_external: When True the grpc deps are prefixed with //external. This
allows grpc to be used as a dependency in other bazel projects.
**kwargs: rest of arguments, e.g., compatible_with and visibility.
"""
if len(srcs) > 1:
fail("Only one srcs value supported", "srcs")
proto_target = "_" + name + "_only"
codegen_target = "_" + name + "_codegen"
codegen_grpc_target = "_" + name + "_grpc_codegen"
proto_deps = ["_" + dep + "_only" for dep in deps if dep.find(':') == -1]
proto_deps += [dep.split(':')[0] + ':' + "_" + dep.split(':')[1] + "_only" for dep in deps if dep.find(':') != -1]
native.proto_library(
name = proto_target,
srcs = srcs,
deps = proto_deps,
**kwargs
)
generate_cc(
name = codegen_target,
srcs = [proto_target],
well_known_protos = well_known_protos,
**kwargs
)
if not proto_only:
if use_external:
# when this file is used by non-grpc projects
plugin = "//external:grpc_cpp_plugin"
else:
plugin = "//:grpc_cpp_plugin"
generate_cc(
name = codegen_grpc_target,
srcs = [proto_target],
plugin = plugin,
well_known_protos = well_known_protos,
**kwargs
)
if use_external:
# when this file is used by non-grpc projects
grpc_deps = ["//external:grpc++", "//external:grpc++_codegen_proto",
"//external:protobuf"]
else:
grpc_deps = ["//:grpc++", "//:grpc++_codegen_proto", "//external:protobuf"]
native.cc_library(
name = name,
srcs = [":" + codegen_grpc_target, ":" + codegen_target],
hdrs = [":" + codegen_grpc_target, ":" + codegen_target],
deps = deps + grpc_deps,
**kwargs
)
else:
native.cc_library(
name = name,
srcs = [":" + codegen_target],
hdrs = [":" + codegen_target],
deps = deps + ["//external:protobuf"],
**kwargs
)
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