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Harvey Tuch authored 2020-05-26 14:27 . Fix depset/list confusion in #7458.
load("@bazel_skylib//lib:versions.bzl", "versions")
load("@rules_cc//cc:defs.bzl", "cc_library")
load("@rules_proto//proto:defs.bzl", "ProtoInfo")
load("@rules_python//python:defs.bzl", "py_library", "py_test")
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 _CcHdrs(srcs, use_grpc_plugin = False):
ret = [s[:-len(".proto")] + ".pb.h" for s in srcs]
if use_grpc_plugin:
ret += [s[:-len(".proto")] + ".grpc.pb.h" for s in srcs]
return ret
def _CcSrcs(srcs, use_grpc_plugin = False):
ret = [s[:-len(".proto")] + ".pb.cc" for s in srcs]
if use_grpc_plugin:
ret += [s[:-len(".proto")] + ".grpc.pb.cc" for s in srcs]
return ret
def _CcOuts(srcs, use_grpc_plugin = False):
return _CcHdrs(srcs, use_grpc_plugin) + _CcSrcs(srcs, use_grpc_plugin)
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 _RelativeOutputPath(path, include, dest = ""):
if include == None:
return path
if not path.startswith(include):
fail("Include path %s isn't part of the path %s." % (include, path))
if include and include[-1] != "/":
include = include + "/"
if dest and dest[-1] != "/":
dest = dest + "/"
path = path[len(include):]
return dest + path
def _proto_gen_impl(ctx):
"""General implementation for generating protos"""
srcs = ctx.files.srcs
deps = depset(direct=ctx.files.srcs)
source_dir = _SourceDir(ctx)
gen_dir = _GenDir(ctx).rstrip("/")
if source_dir:
import_flags = depset(direct=["-I" + source_dir, "-I" + gen_dir])
else:
import_flags = depset(direct=["-I."])
for dep in ctx.attr.deps:
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 ctx.attr.gen_cc and not ctx.attr.gen_py and not ctx.executable.plugin:
return struct(
proto = struct(
srcs = srcs,
import_flags = import_flags,
deps = deps,
),
)
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$(realpath -s %s)" % path)
outs = []
use_grpc_plugin = (ctx.attr.plugin_language == "grpc" and ctx.attr.plugin)
path_tpl = "$(realpath %s)" if in_gen_dir else "%s"
if ctx.attr.gen_cc:
args += [("--cpp_out=" + path_tpl) % gen_dir]
outs.extend(_CcOuts([src.basename], use_grpc_plugin = use_grpc_plugin))
if ctx.attr.gen_py:
args += [("--python_out=" + path_tpl) % gen_dir]
outs.extend(_PyOuts([src.basename], use_grpc_plugin = use_grpc_plugin))
outs = [ctx.actions.declare_file(out, sibling = src) for out in 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(
["$(realpath %s)" % ctx.executable.protoc.path] + args +
import_flags_real + ["-I.", src.basename],
)
command = ";".join([
'CMD="%s"' % orig_command,
"cd %s" % src.dirname,
"${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 struct(
proto = struct(
srcs = srcs,
import_flags = import_flags,
deps = deps,
),
)
proto_gen = rule(
attrs = {
"srcs": attr.label_list(allow_files = True),
"deps": attr.label_list(providers = ["proto"]),
"includes": attr.string_list(),
"protoc": attr.label(
cfg = "host",
executable = True,
allow_single_file = True,
mandatory = True,
),
"plugin": attr.label(
cfg = "host",
allow_files = True,
executable = True,
),
"plugin_language": attr.string(),
"plugin_options": attr.string_list(),
"gen_cc": attr.bool(),
"gen_py": attr.bool(),
"outs": attr.output_list(),
},
output_to_genfiles = True,
implementation = _proto_gen_impl,
)
"""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
gen_cc: generates C++ sources in addition to the ones from the plugin.
gen_py: generates Python sources in addition to the ones from the plugin.
outs: a list of labels of the expected outputs from the protocol compiler.
"""
def _adapt_proto_library_impl(ctx):
deps = [dep[ProtoInfo] for dep in ctx.attr.deps]
srcs = [src for dep in deps for src in dep.direct_sources]
return struct(
proto = struct(
srcs = srcs,
import_flags = ["-I{}".format(path) for dep in deps for path in dep.transitive_proto_path.to_list()],
deps = srcs,
),
)
adapt_proto_library = rule(
implementation = _adapt_proto_library_impl,
attrs = {
"deps": attr.label_list(
mandatory = True,
providers = [ProtoInfo],
),
},
doc = "Adapts `proto_library` from `@rules_proto` to be used with `{cc,py}_proto_library` from this file.",
)
def cc_proto_library(
name,
srcs = [],
deps = [],
cc_libs = [],
include = None,
protoc = "@com_google_protobuf//:protoc",
use_grpc_plugin = False,
default_runtime = "@com_google_protobuf//:protobuf",
**kargs):
"""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:
name: the name of the cc_proto_library.
srcs: the .proto files of the cc_proto_library.
deps: a list of dependency labels; must be cc_proto_library.
cc_libs: a list of other cc_library targets depended by the generated
cc_library.
include: a string indicating the include path of the .proto files.
protoc: the label of the protocol compiler to generate the sources.
use_grpc_plugin: a flag to indicate whether to call the grpc C++ plugin
when processing the proto files.
default_runtime: the implicitly default runtime which will be depended on by
the generated cc_library target.
**kargs: other keyword arguments that are passed to cc_library.
"""
includes = []
if include != None:
includes = [include]
grpc_cpp_plugin = None
if use_grpc_plugin:
grpc_cpp_plugin = "//external:grpc_cpp_plugin"
gen_srcs = _CcSrcs(srcs, use_grpc_plugin)
gen_hdrs = _CcHdrs(srcs, use_grpc_plugin)
outs = gen_srcs + gen_hdrs
proto_gen(
name = name + "_genproto",
srcs = srcs,
deps = [s + "_genproto" for s in deps],
includes = includes,
protoc = protoc,
plugin = grpc_cpp_plugin,
plugin_language = "grpc",
gen_cc = 1,
outs = outs,
visibility = ["//visibility:public"],
)
if default_runtime and not default_runtime in cc_libs:
cc_libs = cc_libs + [default_runtime]
if use_grpc_plugin:
cc_libs = cc_libs + ["//external:grpc_lib"]
cc_library(
name = name,
srcs = gen_srcs,
hdrs = gen_hdrs,
deps = cc_libs + deps,
includes = includes,
**kargs
)
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))
args.add("--java_out", srcjar)
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],
)
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],
),
"_protoc": attr.label(
executable = True,
cfg = "host",
default = "@com_google_protobuf//:protoc",
),
},
)
def internal_copied_filegroup(name, srcs, strip_prefix, dest, **kwargs):
"""Macro to copy files to a different directory and then create a filegroup.
This is used by the //:protobuf_python py_proto_library target to work around
an issue caused by Python source files that are part of the same Python
package being in separate directories.
Args:
srcs: The source files to copy and add to the filegroup.
strip_prefix: Path to the root of the files to copy.
dest: The directory to copy the source files into.
**kwargs: extra arguments that will be passesd to the filegroup.
"""
outs = [_RelativeOutputPath(s, strip_prefix, dest) for s in srcs]
native.genrule(
name = name + "_genrule",
srcs = srcs,
outs = outs,
cmd = " && ".join(
["cp $(location %s) $(location %s)" %
(s, _RelativeOutputPath(s, strip_prefix, dest)) for s in srcs],
),
)
native.filegroup(
name = name,
srcs = outs,
**kwargs
)
def py_proto_library(
name,
srcs = [],
deps = [],
py_libs = [],
py_extra_srcs = [],
include = None,
default_runtime = "@com_google_protobuf//:protobuf_python",
protoc = "@com_google_protobuf//:protoc",
use_grpc_plugin = False,
**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.
**kargs: other keyword arguments that are passed to py_library.
"""
outs = _PyOuts(srcs, use_grpc_plugin)
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",
srcs = srcs,
deps = [s + "_genproto" for s in deps],
includes = includes,
protoc = protoc,
gen_py = 1,
outs = outs,
visibility = ["//visibility:public"],
plugin = grpc_python_plugin,
plugin_language = "grpc",
)
if default_runtime and not default_runtime in py_libs + deps:
py_libs = py_libs + [default_runtime]
py_library(
name = name,
srcs = outs + py_extra_srcs,
deps = py_libs + deps,
imports = includes,
**kargs
)
def internal_protobuf_py_tests(
name,
modules = [],
**kargs):
"""Bazel rules to create batch tests for protobuf internal.
Args:
name: the name of the rule.
modules: a list of modules for tests. The macro will create a py_test for
each of the parameter with the source "google/protobuf/%s.py"
kargs: extra parameters that will be passed into the py_test.
"""
for m in modules:
s = "python/google/protobuf/internal/%s.py" % m
py_test(
name = "py_%s" % m,
srcs = [s],
main = s,
**kargs
)
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")

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