mirror of
https://github.com/edgelesssys/constellation.git
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88 lines
2.8 KiB
Python
88 lines
2.8 KiB
Python
"""
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Rules for generating Go source files from proto files.
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based on https://github.com/bazelbuild/rules_go/issues/2111#issuecomment-1355927231
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"""
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load("@aspect_bazel_lib//lib:write_source_files.bzl", "write_source_files")
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load("@io_bazel_rules_go//go:def.bzl", "GoLibrary", "go_context")
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load("@io_bazel_rules_go//proto:compiler.bzl", "GoProtoCompiler")
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def _output_go_library_srcs_impl(ctx):
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go = go_context(ctx)
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srcs_of_library = []
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importpath = ""
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for src in ctx.attr.deps:
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lib = src[GoLibrary]
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go_src = go.library_to_source(go, ctx.attr, lib, False)
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if importpath and lib.importpath != importpath:
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fail(
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"importpath of all deps must match, got {} and {}",
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importpath,
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lib.importpath,
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)
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importpath = lib.importpath
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srcs_of_library.extend(go_src.srcs)
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if len(srcs_of_library) != 1:
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fail("expected exactly one src for library, got {}", len(srcs_of_library))
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if not ctx.attr.out:
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fail("must specify out for now")
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# Run a command to copy the src file to the out location.
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_copy(ctx, srcs_of_library[0], ctx.outputs.out)
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def _copy(ctx, in_file, out_file):
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# based on https://github.com/bazelbuild/examples/blob/main/rules/shell_command/rules.bzl
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ctx.actions.run_shell(
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# Input files visible to the action.
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inputs = [in_file],
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# Output files that must be created by the action.
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outputs = [out_file],
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progress_message = "Copying {} to {}".format(in_file.path, out_file.path),
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arguments = [in_file.path, out_file.path],
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command = """cp "$1" "$2" """,
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)
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output_go_library_srcs = rule(
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implementation = _output_go_library_srcs_impl,
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attrs = {
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"compiler": attr.label(
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providers = [GoProtoCompiler],
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default = "@io_bazel_rules_go//proto:go_proto",
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),
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"deps": attr.label_list(
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providers = [GoLibrary],
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aspects = [],
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),
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"out": attr.output(
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doc = ("Name of output .go file. If not specified, the file name " +
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"of the generated source file will be used."),
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mandatory = False,
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),
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"_go_context_data": attr.label(
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default = "@io_bazel_rules_go//:go_context_data",
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),
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},
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toolchains = ["@io_bazel_rules_go//go:toolchain"],
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)
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def write_go_proto_srcs(name, go_proto_library, src, visibility = None):
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generated_src = "__generated_" + src
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output_go_library_srcs(
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name = name + "_generated",
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deps = [go_proto_library],
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out = generated_src,
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visibility = ["//visibility:private"],
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)
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write_source_files(
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name = name,
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files = {
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src: generated_src,
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},
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visibility = visibility,
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)
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