Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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109 lines
3.9 KiB
109 lines
3.9 KiB
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load("@bazel_skylib//lib:paths.bzl", "paths") |
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# Generic support code ######################################################### |
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_is_bazel = not hasattr(native, "genmpm") |
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def _get_real_short_path(file): |
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# For some reason, files from other archives have short paths that look like: |
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# ../com_google_protobuf/google/protobuf/descriptor.proto |
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short_path = file.short_path |
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if short_path.startswith("../"): |
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second_slash = short_path.index("/", 3) |
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short_path = short_path[second_slash + 1:] |
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# Sometimes it has another few prefixes like: |
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# _virtual_imports/any_proto/google/protobuf/any.proto |
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# We want just google/protobuf/any.proto. |
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if short_path.startswith("_virtual_imports"): |
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short_path = short_path.split("/", 2)[-1] |
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return short_path |
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def _get_real_root(file): |
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real_short_path = _get_real_short_path(file) |
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return file.path[:-len(real_short_path) - 1] |
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def _generate_output_file(ctx, src, extension): |
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real_short_path = _get_real_short_path(src) |
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real_short_path = paths.relativize(real_short_path, ctx.label.package) |
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output_filename = paths.replace_extension(real_short_path, extension) |
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ret = ctx.actions.declare_file(output_filename) |
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return ret |
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# upb_proto_library / upb_proto_reflection_library shared code ################# |
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_LuaFiles = provider(fields = ["files"]) |
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def _compile_upb_protos(ctx, proto_info, proto_sources): |
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files = [_generate_output_file(ctx, name, "_pb.lua") for name in proto_sources] |
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transitive_sets = proto_info.transitive_descriptor_sets.to_list() |
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ctx.actions.run( |
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inputs = depset( |
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direct = [proto_info.direct_descriptor_set], |
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transitive = [proto_info.transitive_descriptor_sets], |
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), |
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tools = [ctx.executable._upbc], |
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outputs = files, |
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executable = ctx.executable._protoc, |
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arguments = [ |
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"--lua_out=" + _get_real_root(files[0]), |
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"--plugin=protoc-gen-lua=" + ctx.executable._upbc.path, |
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"--descriptor_set_in=" + ctx.configuration.host_path_separator.join([f.path for f in transitive_sets]), |
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] + |
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[_get_real_short_path(file) for file in proto_sources], |
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progress_message = "Generating Lua protos for :" + ctx.label.name, |
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) |
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return files |
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def _lua_proto_rule_impl(ctx): |
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if len(ctx.attr.deps) != 1: |
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fail("only one deps dependency allowed.") |
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dep = ctx.attr.deps[0] |
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if _LuaFiles not in dep: |
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fail("proto_library rule must generate _LuaFiles (aspect should have handled this).") |
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files = dep[_LuaFiles].files |
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return [ |
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DefaultInfo( |
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files = files, |
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data_runfiles = ctx.runfiles(files = files.to_list())), |
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] |
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def _lua_proto_library_aspect_impl(target, ctx): |
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proto_info = target[ProtoInfo] |
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files = _compile_upb_protos(ctx, proto_info, proto_info.direct_sources) |
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deps = ctx.rule.attr.deps |
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transitive = [dep[_LuaFiles].files for dep in deps if _LuaFiles in dep] |
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return [_LuaFiles(files = depset(direct = files, transitive = transitive))] |
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# lua_proto_library() ########################################################## |
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_lua_proto_library_aspect = aspect( |
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attrs = { |
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"_upbc": attr.label( |
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executable = True, |
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cfg = "host", |
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default = "//:protoc-gen-lua", |
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), |
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"_protoc": attr.label( |
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executable = True, |
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cfg = "host", |
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default = "@com_google_protobuf//:protoc", |
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), |
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}, |
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implementation = _lua_proto_library_aspect_impl, |
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provides = [_LuaFiles], |
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attr_aspects = ["deps"], |
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fragments = ["cpp"], |
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) |
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lua_proto_library = rule( |
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output_to_genfiles = True, |
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implementation = _lua_proto_rule_impl, |
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attrs = { |
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"deps": attr.label_list( |
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aspects = [_lua_proto_library_aspect], |
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allow_rules = ["proto_library"], |
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providers = [ProtoInfo], |
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), |
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}, |
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)
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