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protobuf.bzl
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protobuf.bzl
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load("@bazel_skylib//lib:versions.bzl", "versions")
load("@rules_cc//cc:defs.bzl", "objc_library")
load("@rules_proto//proto:defs.bzl", "ProtoInfo")
load("@rules_python//python:defs.bzl", "py_library")
load("@rules_ruby//ruby:defs.bzl", "ruby_library")
def _GetPath(ctx, path):
if ctx.label.workspace_root:
return ctx.label.workspace_root + "/" + path
else:
return path
def _IsNewExternal(ctx):
# Bazel 0.4.4 and older have genfiles paths that look like:
# bazel-out/local-fastbuild/genfiles/external/repo/foo
# After the exec root rearrangement, they look like:
# ../repo/bazel-out/local-fastbuild/genfiles/foo
return ctx.label.workspace_root.startswith("../")
def _GenDir(ctx):
if _IsNewExternal(ctx):
# We are using the fact that Bazel 0.4.4+ provides repository-relative paths
# for ctx.genfiles_dir.
return ctx.genfiles_dir.path + (
"/" + ctx.attr.includes[0] if ctx.attr.includes and ctx.attr.includes[0] else ""
)
# This means that we're either in the old version OR the new version in the local repo.
# Either way, appending the source path to the genfiles dir works.
return ctx.var["GENDIR"] + "/" + _SourceDir(ctx)
def _SourceDir(ctx):
if not ctx.attr.includes:
return ctx.label.workspace_root
if not ctx.attr.includes[0]:
return _GetPath(ctx, ctx.label.package)
if not ctx.label.package:
return _GetPath(ctx, ctx.attr.includes[0])
return _GetPath(ctx, ctx.label.package + "/" + ctx.attr.includes[0])
def _ObjcBase(srcs):
return [
"".join([token.capitalize() for token in src[:-len(".proto")].split("_")])
for src in srcs
]
def _ObjcHdrs(srcs):
return [src + ".pbobjc.h" for src in _ObjcBase(srcs)]
def _ObjcSrcs(srcs):
return [src + ".pbobjc.m" for src in _ObjcBase(srcs)]
def _ObjcOuts(srcs, out_type):
if out_type == "hdrs":
return _ObjcHdrs(srcs)
if out_type == "srcs":
return _ObjcSrcs(srcs)
return _ObjcHdrs(srcs) + _ObjcSrcs(srcs)
def _PyOuts(srcs, use_grpc_plugin = False):
ret = [s[:-len(".proto")] + "_pb2.py" for s in srcs]
if use_grpc_plugin:
ret += [s[:-len(".proto")] + "_pb2_grpc.py" for s in srcs]
return ret
def _RubyOuts(srcs):
return [s[:-len(".proto")] + "_pb.rb" for s in srcs]
def _CsharpOuts(srcs):
return [
"".join([token.capitalize() for token in src[:-len(".proto")].split("_")]) + ".cs"
for src in srcs
]
ProtoGenInfo = provider(
fields = ["srcs", "import_flags", "deps"],
)
def _proto_gen_impl(ctx):
"""General implementation for generating protos"""
srcs = ctx.files.srcs
langs = ctx.attr.langs or []
out_type = ctx.attr.out_type
deps = depset(direct = ctx.files.srcs)
source_dir = _SourceDir(ctx)
gen_dir = _GenDir(ctx).rstrip("/")
import_flags = []
if source_dir:
has_sources = any([src.is_source for src in srcs])
if has_sources:
import_flags += ["-I" + source_dir]
else:
import_flags += ["-I."]
has_generated = any([not src.is_source for src in srcs])
if has_generated:
import_flags += ["-I" + gen_dir]
if ctx.attr.includes:
for include in ctx.attr.includes:
import_flags += ["-I" + _GetPath(ctx, include)]
import_flags = depset(direct = import_flags)
for dep in ctx.attr.deps:
dep_proto = dep[ProtoGenInfo]
if type(dep_proto.import_flags) == "list":
import_flags = depset(
transitive = [import_flags],
direct = dep_proto.import_flags,
)
else:
import_flags = depset(
transitive = [import_flags, dep_proto.import_flags],
)
if type(dep_proto.deps) == "list":
deps = depset(transitive = [deps], direct = dep_proto.deps)
else:
deps = depset(transitive = [deps, dep_proto.deps])
if not langs and not ctx.executable.plugin:
return [
ProtoGenInfo(
srcs = srcs,
import_flags = import_flags,
deps = deps,
),
]
generated_files = []
for src in srcs:
args = []
in_gen_dir = src.root.path == gen_dir
if in_gen_dir:
import_flags_real = []
for f in import_flags.to_list():
path = f.replace("-I", "")
import_flags_real.append("-I$(realpath -s %s)" % path)
use_grpc_plugin = (ctx.attr.plugin_language == "grpc" and ctx.attr.plugin)
path_tpl = "$(realpath %s)" if in_gen_dir else "%s"
outs = []
for lang in langs:
if lang == "csharp":
outs.extend(_CsharpOuts([src.basename]))
elif lang == "objc":
outs.extend(_ObjcOuts([src.basename], out_type = out_type))
elif lang == "python":
outs.extend(_PyOuts([src.basename], use_grpc_plugin = use_grpc_plugin))
elif lang == "ruby":
outs.extend(_RubyOuts([src.basename]))
# Otherwise, rely on user-supplied outs.
args += [("--%s_out=" + path_tpl) % (lang, gen_dir)]
if ctx.attr.outs:
outs.extend(ctx.attr.outs)
outs = [ctx.actions.declare_file(out, sibling = src) for out in outs]
generated_files.extend(outs)
inputs = [src] + deps.to_list()
tools = [ctx.executable.protoc]
if ctx.executable.plugin:
plugin = ctx.executable.plugin
lang = ctx.attr.plugin_language
if not lang and plugin.basename.startswith("protoc-gen-"):
lang = plugin.basename[len("protoc-gen-"):]
if not lang:
fail("cannot infer the target language of plugin", "plugin_language")
outdir = "." if in_gen_dir else gen_dir
if ctx.attr.plugin_options:
outdir = ",".join(ctx.attr.plugin_options) + ":" + outdir
args += [("--plugin=protoc-gen-%s=" + path_tpl) % (lang, plugin.path)]
args += ["--%s_out=%s" % (lang, outdir)]
tools.append(plugin)
if not in_gen_dir:
ctx.actions.run(
inputs = inputs,
tools = tools,
outputs = outs,
arguments = args + import_flags.to_list() + [src.path],
executable = ctx.executable.protoc,
mnemonic = "ProtoCompile",
use_default_shell_env = True,
)
else:
for out in outs:
orig_command = " ".join(
["$(realpath %s)" % ctx.executable.protoc.path] + args +
import_flags_real + [src.basename],
)
command = ";".join([
'CMD="%s"' % orig_command,
"cd %s" % src.dirname,
"${CMD}",
"cd -",
])
generated_out = "/".join([gen_dir, out.basename])
if generated_out != out.path:
command += ";mv %s %s" % (generated_out, out.path)
ctx.actions.run_shell(
inputs = inputs,
outputs = [out],
command = command,
mnemonic = "ProtoCompile",
tools = tools,
use_default_shell_env = True,
)
return [
ProtoGenInfo(
srcs = srcs,
import_flags = import_flags,
deps = deps,
),
DefaultInfo(files = depset(generated_files)),
]
"""Generates codes from Protocol Buffers definitions.
This rule helps you to implement Skylark macros specific to the target
language. You should prefer more specific `cc_proto_library `,
`py_proto_library` and others unless you are adding such wrapper macros.
Args:
srcs: Protocol Buffers definition files (.proto) to run the protocol compiler
against.
deps: a list of dependency labels; must be other proto libraries.
includes: a list of include paths to .proto files.
protoc: the label of the protocol compiler to generate the sources.
plugin: the label of the protocol compiler plugin to be passed to the protocol
compiler.
plugin_language: the language of the generated sources
plugin_options: a list of options to be passed to the plugin
langs: generates sources in addition to the ones from the plugin for each
specified language.
outs: a list of labels of the expected outputs from the protocol compiler.
out_type: only generated a single type of source file for languages that have
split sources (e.g. *.h and *.cc in C++)
"""
_proto_gen = rule(
attrs = {
"srcs": attr.label_list(allow_files = True),
"deps": attr.label_list(providers = [ProtoGenInfo]),
"includes": attr.string_list(),
"protoc": attr.label(
cfg = "exec",
executable = True,
allow_single_file = True,
mandatory = True,
),
"plugin": attr.label(
cfg = "exec",
allow_files = True,
executable = True,
),
"plugin_language": attr.string(),
"plugin_options": attr.string_list(),
"langs": attr.string_list(),
"outs": attr.string_list(),
"out_type": attr.string(
default = "all",
),
},
output_to_genfiles = True,
implementation = _proto_gen_impl,
)
def _internal_gen_well_known_protos_java_impl(ctx):
args = ctx.actions.args()
deps = [d[ProtoInfo] for d in ctx.attr.deps]
srcjar = ctx.actions.declare_file("{}.srcjar".format(ctx.attr.name))
if ctx.attr.javalite:
java_out = "lite:%s" % srcjar.path
else:
java_out = srcjar
args.add("--java_out", java_out)
descriptors = depset(
transitive = [dep.transitive_descriptor_sets for dep in deps],
)
args.add_joined(
"--descriptor_set_in",
descriptors,
join_with = ctx.configuration.host_path_separator,
)
for dep in deps:
if "." == dep.proto_source_root:
args.add_all([src.path for src in dep.direct_sources])
else:
source_root = dep.proto_source_root
offset = len(source_root) + 1 # + '/'.
args.add_all([src.path[offset:] for src in dep.direct_sources])
ctx.actions.run(
executable = ctx.executable._protoc,
inputs = descriptors,
outputs = [srcjar],
arguments = [args],
mnemonic = "ProtoCompile",
use_default_shell_env = True,
)
return [
DefaultInfo(
files = depset([srcjar]),
),
]
internal_gen_well_known_protos_java = rule(
implementation = _internal_gen_well_known_protos_java_impl,
attrs = {
"deps": attr.label_list(
mandatory = True,
providers = [ProtoInfo],
),
"javalite": attr.bool(
default = False,
),
"_protoc": attr.label(
executable = True,
cfg = "exec",
default = "//:protoc",
),
},
)
def _internal_gen_kt_protos(ctx):
args = ctx.actions.args()
deps = [d[ProtoInfo] for d in ctx.attr.deps]
srcjar = ctx.actions.declare_file("{}.srcjar".format(ctx.attr.name))
if ctx.attr.lite:
out = "lite:%s" % srcjar.path
else:
out = srcjar
args.add("--kotlin_out", out)
descriptors = depset(
transitive = [dep.transitive_descriptor_sets for dep in deps],
)
args.add_joined(
"--descriptor_set_in",
descriptors,
join_with = ctx.configuration.host_path_separator,
)
for dep in deps:
if "." == dep.proto_source_root:
args.add_all([src.path for src in dep.direct_sources])
else:
source_root = dep.proto_source_root
offset = len(source_root) + 1 # + '/'.
args.add_all([src.path[offset:] for src in dep.direct_sources])
ctx.actions.run(
executable = ctx.executable._protoc,
inputs = descriptors,
outputs = [srcjar],
arguments = [args],
mnemonic = "ProtoCompile",
use_default_shell_env = True,
)
return [
DefaultInfo(
files = depset([srcjar]),
),
]
internal_gen_kt_protos = rule(
implementation = _internal_gen_kt_protos,
attrs = {
"deps": attr.label_list(
mandatory = True,
providers = [ProtoInfo],
),
"lite": attr.bool(
default = False,
),
"_protoc": attr.label(
executable = True,
cfg = "exec",
default = "//:protoc",
),
},
)
def internal_objc_proto_library(
name,
srcs = [],
deps = [],
outs = [],
proto_deps = [],
includes = ["."],
default_runtime = Label("//:protobuf_objc"),
protoc = Label("//:protoc"),
testonly = None,
visibility = ["//visibility:public"],
**kwargs):
"""Bazel rule to create a Objective-C protobuf library from proto source
files
NOTE: the rule is only an internal workaround to generate protos. The
interface may change and the rule may be removed when bazel has introduced
the native rule.
Args:
name: the name of the objc_proto_library.
srcs: the .proto files to compile.
deps: a list of dependency labels; must be objc_proto_library.
outs: a list of expected output files.
proto_deps: a list of proto file dependencies that don't have a
objc_proto_library rule.
include: a string indicating the include path of the .proto files.
default_runtime: the Objective-C Protobuf runtime
protoc: the label of the protocol compiler to generate the sources.
testonly: common rule attribute (see:
https://bazel.build/reference/be/common-definitions#common-attributes)
visibility: the visibility of the generated files.
**kwargs: other keyword arguments that are passed to py_library.
"""
full_deps = [d + "_genproto" for d in deps]
if proto_deps:
_proto_gen(
name = name + "_deps_genproto",
testonly = testonly,
srcs = proto_deps,
protoc = protoc,
includes = includes,
)
full_deps.append(":%s_deps_genproto" % name)
# Note: we need to run the protoc build twice to get separate targets for
# the generated header and the source files.
_proto_gen(
name = name + "_genproto_hdrs",
srcs = srcs,
deps = full_deps,
langs = ["objc"],
out_type = "hdrs",
includes = includes,
protoc = protoc,
testonly = testonly,
visibility = visibility,
tags = ["manual"],
)
_proto_gen(
name = name + "_genproto",
srcs = srcs,
deps = full_deps,
langs = ["objc"],
out_type = "srcs",
includes = includes,
protoc = protoc,
testonly = testonly,
visibility = visibility,
tags = ["manual"],
)
objc_library(
name = name,
hdrs = [name + "_genproto_hdrs"],
non_arc_srcs = [name + "_genproto"],
deps = [default_runtime],
includes = includes,
testonly = testonly,
visibility = visibility,
# Don't auto-expand these targets until target_compatible_with
# works. See https://github.com/bazelbuild/bazel/issues/12897.
tags = ["manual"],
target_compatible_with = ["@platforms//os:osx"],
**kwargs
)
def internal_ruby_proto_library(
name,
srcs = [],
deps = [],
includes = ["."],
default_runtime = "@com_google_protobuf//ruby:protobuf",
protoc = "@com_google_protobuf//:protoc",
testonly = None,
visibility = ["//visibility:public"],
**kwargs):
"""Bazel rule to create a Ruby protobuf library from proto source files
NOTE: the rule is only an internal workaround to generate protos. The
interface may change and the rule may be removed when bazel has introduced
the native rule.
Args:
name: the name of the ruby_proto_library.
srcs: the .proto files to compile.
deps: a list of dependency labels; must be a internal_ruby_proto_library.
includes: a string indicating the include path of the .proto files.
default_runtime: the RubyProtobuf runtime
protoc: the label of the protocol compiler to generate the sources.
testonly: common rule attribute (see:
https://bazel.build/reference/be/common-definitions#common-attributes)
visibility: the visibility of the generated files.
**kwargs: other keyword arguments that are passed to ruby_library.
"""
# Note: we need to run the protoc build twice to get separate targets for
# the generated header and the source files.
_proto_gen(
name = name + "_genproto",
srcs = srcs,
deps = [s + "_genproto" for s in deps],
langs = ["ruby"],
includes = includes,
protoc = protoc,
testonly = testonly,
visibility = visibility,
tags = ["manual"],
)
deps = []
if default_runtime:
deps.append(default_runtime)
ruby_library(
name = name,
srcs = [name + "_genproto"],
deps = deps,
testonly = testonly,
visibility = visibility,
includes = includes,
**kwargs
)
# When canonical labels are in use, use additional "@" prefix
_canonical_label_prefix = "@" if str(Label("//:protoc")).startswith("@@") else ""
def _to_label(label_str):
"""Converts a string to a label using the repository of the calling thread"""
if type(label_str) == type(Label("//:foo")):
return label_str
return Label(_canonical_label_prefix + native.repository_name() + "//" + native.package_name() + ":foo").relative(label_str)
def internal_py_proto_library(
name,
srcs = [],
deps = [],
py_libs = [],
py_extra_srcs = [],
include = None,
default_runtime = Label("//:protobuf_python"),
protoc = Label("//:protoc"),
use_grpc_plugin = False,
testonly = None,
**kargs):
"""Bazel rule to create a Python protobuf library from proto source files
NOTE: the rule is only an internal workaround to generate protos. The
interface may change and the rule may be removed when bazel has introduced
the native rule.
Args:
name: the name of the py_proto_library.
srcs: the .proto files of the py_proto_library.
deps: a list of dependency labels; must be py_proto_library.
py_libs: a list of other py_library targets depended by the generated
py_library.
py_extra_srcs: extra source files that will be added to the output
py_library. This attribute is used for internal bootstrapping.
include: a string indicating the include path of the .proto files.
default_runtime: the implicitly default runtime which will be depended on by
the generated py_library target.
protoc: the label of the protocol compiler to generate the sources.
use_grpc_plugin: a flag to indicate whether to call the Python C++ plugin
when processing the proto files.
testonly: common rule attribute (see:
https://bazel.build/reference/be/common-definitions#common-attributes)
**kargs: other keyword arguments that are passed to py_library.
"""
includes = []
if include != None:
includes = [include]
grpc_python_plugin = None
if use_grpc_plugin:
grpc_python_plugin = "//external:grpc_python_plugin"
# Note: Generated grpc code depends on Python grpc module. This dependency
# is not explicitly listed in py_libs. Instead, host system is assumed to
# have grpc installed.
_proto_gen(
name = name + "_genproto",
testonly = testonly,
srcs = srcs,
deps = [s + "_genproto" for s in deps],
includes = includes,
protoc = protoc,
langs = ["python"],
visibility = ["//visibility:public"],
plugin = grpc_python_plugin,
plugin_language = "grpc",
)
if default_runtime:
# Resolve non-local labels
labels = [_to_label(lib) for lib in py_libs + deps]
if not _to_label(default_runtime) in labels:
py_libs = py_libs + [default_runtime]
py_library(
name = name,
testonly = testonly,
srcs = [name + "_genproto"] + py_extra_srcs,
deps = py_libs + deps,
imports = includes,
**kargs
)
def py_proto_library(
*args,
**kwargs):
"""Deprecated alias for use before Bazel 5.3.
Args:
*args: the name of the py_proto_library.
**kwargs: other keyword arguments that are passed to py_library.
Deprecated:
This is provided for backwards compatibility only. Bazel 5.3 will
introduce support for py_proto_library, which should be used instead.
"""
internal_py_proto_library(*args, **kwargs)
def _source_proto_library(
name,
srcs = [],
deps = [],
proto_deps = [],
outs = [],
lang = None,
includes = ["."],
protoc = Label("//:protoc"),
testonly = None,
visibility = ["//visibility:public"],
**kwargs):
"""Bazel rule to create generated protobuf code from proto source files for
languages not well supported by Bazel yet. This will output the generated
code as-is without any compilation. This is most useful for interpreted
languages that don't require it.
NOTE: the rule is only an internal workaround to generate protos. The
interface may change and the rule may be removed when bazel has introduced
the native rule.
Args:
name: the name of the unsupported_proto_library.
srcs: the .proto files to compile. Note, that for languages where out
needs to be provided, only a single source file is allowed.
deps: a list of dependency labels; must be unsupported_proto_library.
proto_deps: a list of proto file dependencies that don't have a
unsupported_proto_library rule.
lang: the language to (optionally) generate code for.
outs: a list of expected output files. This is only required for
languages where we can't predict the outputs.
includes: strings indicating the include path of the .proto files.
protoc: the label of the protocol compiler to generate the sources.
testonly: common rule attribute (see:
https://bazel.build/reference/be/common-definitions#common-attributes)
visibility: the visibility of the generated files.
**kwargs: other keyword arguments that are passed to py_library.
"""
if outs and len(srcs) != 1:
fail("Custom outputs only allowed for single proto targets.")
langs = []
if lang != None:
langs = [lang]
full_deps = [d + "_genproto" for d in deps]
if proto_deps:
_proto_gen(
name = name + "_deps_genproto",
testonly = testonly,
srcs = proto_deps,
protoc = protoc,
includes = includes,
)
full_deps.append(":%s_deps_genproto" % name)
_proto_gen(
name = name + "_genproto",
srcs = srcs,
deps = full_deps,
langs = langs,
outs = outs,
includes = includes,
protoc = protoc,
testonly = testonly,
visibility = visibility,
)
native.filegroup(
name = name,
srcs = [":%s_genproto" % name],
testonly = testonly,
visibility = visibility,
**kwargs
)
def internal_csharp_proto_library(**kwargs):
"""Bazel rule to create a C# protobuf library from proto source files
NOTE: the rule is only an internal workaround to generate protos. The
interface may change and the rule may be removed when bazel has introduced
the native rule.
Args:
**kwargs: arguments that are passed to unsupported_proto_library.
"""
_source_proto_library(
lang = "csharp",
**kwargs
)
def internal_php_proto_library(**kwargs):
"""Bazel rule to create a PHP protobuf library from proto source files
NOTE: the rule is only an internal workaround to generate protos. The
interface may change and the rule may be removed when bazel has introduced
the native rule.
Args:
**kwargs: arguments that are passed to unsupported_proto_library.
"""
if not kwargs.get("outs"):
fail("Unable to predict the outputs for php_proto_library. Please specify them via `outs`.")
_source_proto_library(
lang = "php",
**kwargs
)
def check_protobuf_required_bazel_version():
"""For WORKSPACE files, to check the installed version of bazel.
This ensures bazel supports our approach to proto_library() depending on a
copied filegroup. (Fixed in bazel 0.5.4)
"""
versions.check(minimum_bazel_version = "0.5.4")