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scalapb_aspect.bzl
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scalapb_aspect.bzl
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load("@rules_proto//proto:defs.bzl", "ProtoInfo")
load("//scala/private:common.bzl", "write_manifest_file")
load("//scala/private:dependency.bzl", "legacy_unclear_dependency_info_for_protobuf_scrooge")
load("//scala/private:rule_impls.bzl", "compile_scala")
load("//scala_proto/private:proto_to_scala_src.bzl", "proto_to_scala_src")
ScalaPBAspectInfo = provider(fields = [
"proto_info",
"src_jars",
"output_files",
"java_info",
])
ScalaPBImport = provider(fields = [
"java_info",
"proto_info",
])
ScalaPBInfo = provider(fields = [
"aspect_info",
])
def merge_proto_infos(tis):
return struct(
transitive_sources = [t.transitive_sources for t in tis],
)
def merge_scalapb_aspect_info(scalapbs):
return ScalaPBAspectInfo(
src_jars = depset(transitive = [s.src_jars for s in scalapbs]),
output_files = depset(transitive = [s.output_files for s in scalapbs]),
proto_info = merge_proto_infos([s.proto_info for s in scalapbs]),
java_info = java_common.merge([s.java_info for s in scalapbs]),
)
def _compiled_jar_file(actions, scalapb_jar):
scalapb_jar_name = scalapb_jar.basename
# ends with .srcjar, so remove last 6 characters
without_suffix = scalapb_jar_name[0:len(scalapb_jar_name) - 6]
# this already ends with _scalapb because that is how scalapb_jar is named
compiled_jar = without_suffix + "jar"
return actions.declare_file(compiled_jar, sibling = scalapb_jar)
def _compile_scala(
ctx,
scalac,
label,
output,
scalapb_jar,
deps_java_info,
implicit_deps,
resources,
resource_strip_prefix):
manifest = ctx.actions.declare_file(
label.name + "_MANIFEST.MF",
sibling = scalapb_jar,
)
write_manifest_file(ctx.actions, manifest, None)
statsfile = ctx.actions.declare_file(
label.name + "_scalac.statsfile",
sibling = scalapb_jar,
)
diagnosticsfile = ctx.actions.declare_file(
label.name + "_scalac.diagnosticsproto",
sibling = scalapb_jar,
)
merged_deps = java_common.merge(_concat_lists(deps_java_info, implicit_deps))
# this only compiles scala, not the ijar, but we don't
# want the ijar for generated code anyway: any change
# in the proto generally will change the interface and
# method bodies
compile_scala(
ctx,
Label("%s-fast" % (label)),
output,
manifest,
statsfile,
diagnosticsfile,
sources = [],
cjars = merged_deps.compile_jars,
all_srcjars = depset([scalapb_jar]),
transitive_compile_jars = merged_deps.transitive_compile_time_jars,
plugins = [],
resource_strip_prefix = resource_strip_prefix,
resources = resources,
resource_jars = [],
labels = {},
in_scalacopts = [],
print_compile_time = False,
expect_java_output = False,
scalac_jvm_flags = [],
scalac = scalac,
dependency_info = legacy_unclear_dependency_info_for_protobuf_scrooge(ctx),
unused_dependency_checker_ignored_targets = [],
)
return JavaInfo(
source_jar = scalapb_jar,
deps = deps_java_info + implicit_deps,
runtime_deps = deps_java_info + implicit_deps,
exports = deps_java_info + implicit_deps,
output_jar = output,
compile_jar = output,
)
####
# This is applied to the DAG of proto_librarys reachable from a deps
# or a scalapb_scala_library. Each proto_library will be one scalapb
# invocation assuming it has some sources.
def _scalapb_aspect_impl(target, ctx):
deps = [d[ScalaPBAspectInfo].java_info for d in ctx.rule.attr.deps]
if ProtoInfo not in target:
# We allow some dependencies which are not protobuf, but instead
# are jvm deps. This is to enable cases of custom generators which
# add a needed jvm dependency.
java_info = target[JavaInfo]
src_jars = depset()
outs = depset()
transitive_ti = merge_proto_infos(
[
d[ScalaPBAspectInfo].proto_info
for d in ctx.rule.attr.deps
],
)
else:
target_ti = target[ProtoInfo]
transitive_ti = merge_proto_infos(
[
d[ScalaPBAspectInfo].proto_info
for d in ctx.rule.attr.deps
] + [target_ti],
)
# we sort so the inputs are always the same for caching
compile_protos = sorted(target_ti.direct_sources)
transitive_protos = sorted(target_ti.transitive_sources.to_list())
toolchain = ctx.toolchains["@io_bazel_rules_scala//scala_proto:toolchain_type"]
flags = []
imps = [j[JavaInfo] for j in ctx.attr._implicit_compile_deps]
if toolchain.with_grpc:
flags.append("grpc")
imps.extend([j[JavaInfo] for j in ctx.attr._grpc_deps])
if toolchain.with_flat_package:
flags.append("flat_package")
if toolchain.with_single_line_to_string:
flags.append("single_line_to_proto_string")
extra_generator_jars = []
for generator_dep in toolchain.extra_generator_dependencies:
jinfo = generator_dep[JavaInfo]
extra_generator_jars.extend(jinfo.transitive_runtime_jars.to_list())
# This feels rather hacky and odd, but we can't compare the labels to ignore a target easily
# since the @ or // forms seem to not have good equality :( , so we aim to make them absolute
#
# the backlisted protos in the tool chain get made into to absolute paths
# so we make the local target we are looking at absolute too
target_absolute_label = target.label
if not str(target_absolute_label)[0] == "@":
target_absolute_label = Label("@%s//%s:%s" % (ctx.workspace_name, target.label.package, target.label.name))
for lbl in toolchain.blacklisted_protos:
if (lbl.label == target_absolute_label):
compile_protos = False
code_generator = toolchain.code_generator
if compile_protos:
scalapb_file = ctx.actions.declare_file(
target.label.name + "_scalapb.srcjar",
)
proto_to_scala_src(
ctx,
target.label,
code_generator,
compile_protos,
transitive_protos,
target_ti.transitive_proto_path.to_list(),
flags,
scalapb_file,
toolchain.named_generators,
sorted(extra_generator_jars),
)
src_jars = depset([scalapb_file])
output = _compiled_jar_file(ctx.actions, scalapb_file)
outs = depset([output])
java_info = _compile_scala(
ctx,
toolchain.scalac,
target.label,
output,
scalapb_file,
deps,
imps,
compile_protos,
"" if target_ti.proto_source_root == "." else target_ti.proto_source_root,
)
else:
# this target is only an aggregation target
src_jars = depset()
outs = depset()
java_info = java_common.merge(_concat_lists(deps, imps))
return [
ScalaPBAspectInfo(
src_jars = src_jars,
output_files = outs,
proto_info = transitive_ti,
java_info = java_info,
),
]
def _concat_lists(list1, list2):
all_providers = []
all_providers.extend(list1)
all_providers.extend(list2)
return all_providers
scalapb_aspect = aspect(
implementation = _scalapb_aspect_impl,
attr_aspects = ["deps"],
required_aspect_providers = [
[ProtoInfo],
[ScalaPBImport],
],
attrs = {
"_protoc": attr.label(executable = True, cfg = "host", default = "@com_google_protobuf//:protoc"),
"_implicit_compile_deps": attr.label_list(cfg = "target", default = [
"//external:io_bazel_rules_scala/dependency/proto/implicit_compile_deps",
]),
"_grpc_deps": attr.label_list(cfg = "target", default = [
"//external:io_bazel_rules_scala/dependency/proto/grpc_deps",
]),
},
toolchains = [
"@io_bazel_rules_scala//scala:toolchain_type",
"@io_bazel_rules_scala//scala_proto:toolchain_type",
],
)