Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Implement read support for proto2 extensions #163

Merged
merged 1 commit into from
Feb 12, 2024
Merged
Show file tree
Hide file tree
Changes from all commits
Commits
File filter

Filter by extension

Filter by extension

Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
161 changes: 133 additions & 28 deletions pb-jelly-gen/codegen/codegen.py
Original file line number Diff line number Diff line change
Expand Up @@ -133,11 +133,7 @@ def escape_name(s: str) -> str:
# https://github.com/protocolbuffers/protobuf/blob/master/src/google/protobuf/descriptor.proto
SourceCodeLocation = List[int]
ProtoTypes = Union[FileDescriptorProto, EnumDescriptorProto, DescriptorProto]
WalkRet = Tuple[
List[Tuple[List[Text], EnumDescriptorProto, SourceCodeLocation]],
List[Tuple[List[Text], DescriptorProto, SourceCodeLocation]],
]
ModTree = DefaultDict[Text, DefaultDict[Text, Any]]
ModTree = DefaultDict[Text, "ModTree"]


T = TypeVar("T")
Expand Down Expand Up @@ -223,7 +219,7 @@ def __init__(
self,
ctx: "Context",
proto_file: FileDescriptorProto,
msg_type: DescriptorProto,
msg_type: Optional[DescriptorProto],
field: FieldDescriptorProto,
) -> None:
self.ctx = ctx
Expand All @@ -234,6 +230,7 @@ def __init__(
self.oneof = (
field.HasField("oneof_index")
and not field.proto3_optional
and msg_type is not None
and msg_type.oneof_decl[field.oneof_index]
)

Expand Down Expand Up @@ -784,7 +781,7 @@ def write_comments(self, sci_loc: Optional[SourceCodeInfo.Location]) -> None:
self.write_line_broken_text_with_prefix(sci_loc.trailing_comments, "///")

def rust_type(
self, msg_type: DescriptorProto, field: FieldDescriptorProto
self, msg_type: Optional[DescriptorProto], field: FieldDescriptorProto
) -> RustType:
return RustType(self.ctx, self.proto_file, msg_type, field)

Expand Down Expand Up @@ -971,6 +968,11 @@ def gen_msg(
name = "_".join(path + [msg_type.name])
escaped_name = escape_name(name)

preserve_unrecognized = msg_type.options.Extensions[
extensions_pb2.preserve_unrecognized
]
has_extensions = len(msg_type.extension_range) > 0

oneof_fields: DefaultDict[Text, List[FieldDescriptorProto]] = defaultdict(list)
proto3_optional_synthetic_oneofs: Set[int] = {
field.oneof_index for field in msg_type.field if field.proto3_optional
Expand Down Expand Up @@ -1024,9 +1026,12 @@ def gen_msg(
% (escape_name(oneof.name), oneof_msg_name(name, oneof))
)

if msg_type.options.Extensions[extensions_pb2.preserve_unrecognized]:
if preserve_unrecognized:
self.write("pub _unrecognized: Vec<u8>,")

if has_extensions:
self.write("pub _extensions: ::pb_jelly::Unrecognized,")

# Generate any oneof enum structs
for oneof in oneof_decls:
self.write("#[derive(%s)]" % ", ".join(sorted(derives)))
Expand Down Expand Up @@ -1124,10 +1129,10 @@ def gen_msg(
self.write(
"%s: %s," % (escape_name(oneof.name), typ.default(name))
)
if msg_type.options.Extensions[
extensions_pb2.preserve_unrecognized
]:
if preserve_unrecognized:
self.write("_unrecognized: Vec::new(),")
if has_extensions:
self.write("_extensions: ::pb_jelly::Unrecognized::default(),")

with block(self, "lazy_static!"):
self.write(
Expand Down Expand Up @@ -1205,10 +1210,7 @@ def gen_msg(
self.write('name: "%s",' % oneof.name)

with block(self, "fn compute_size(&self) -> usize"):
if (
len(msg_type.field) > 0
or msg_type.options.Extensions[extensions_pb2.preserve_unrecognized]
):
if len(msg_type.field) > 0 or preserve_unrecognized or has_extensions:
self.write("let mut size = 0;")
for field in msg_type.field:
typ = self.rust_type(msg_type, field)
Expand Down Expand Up @@ -1263,10 +1265,10 @@ def gen_msg(
% field.name
)
self.write("size += %s_size;" % field.name)
if msg_type.options.Extensions[
extensions_pb2.preserve_unrecognized
]:
if preserve_unrecognized:
self.write("size += self._unrecognized.len();")
if has_extensions:
self.write("size += self._extensions.compute_size();")
self.write("size")
else:
self.write("0")
Expand Down Expand Up @@ -1341,17 +1343,16 @@ def gen_msg(
)
self.write("::pb_jelly::varint::write(l as u64, w)?;")
self.write("::pb_jelly::Message::serialize(val, w)?;")
if msg_type.options.Extensions[extensions_pb2.preserve_unrecognized]:
if preserve_unrecognized:
self.write("w.write_all(&self._unrecognized)?;")
if has_extensions:
self.write("self._extensions.serialize(w)?;")
self.write("Ok(())")

with block(
self,
"fn deserialize<B: ::pb_jelly::PbBufferReader>(&mut self, mut buf: &mut B) -> ::std::io::Result<()>",
):
preserve_unrecognized = msg_type.options.Extensions[
extensions_pb2.preserve_unrecognized
]
if preserve_unrecognized:
self.write(
"let mut unrecognized = ::pb_jelly::Unrecognized::default();"
Expand Down Expand Up @@ -1461,6 +1462,15 @@ def gen_msg(
"self.%s = %s;"
% (escape_name(field.name), field_val)
)
if has_extensions:
pattern = " | ".join(
"{}..={}".format(r.start, r.end - 1)
for r in msg_type.extension_range
)
with block(self, pattern + " =>"):
self.write(
"self._extensions.gather(field_number, typ, &mut buf)?;"
)
with block(self, "_ =>"):
if preserve_unrecognized:
self.write(
Expand Down Expand Up @@ -1488,7 +1498,12 @@ def gen_msg(
)

if preserve_unrecognized:
self.write("unrecognized.serialize(&mut self._unrecognized)?;")
self.write(
"self._unrecognized.reserve(unrecognized.compute_size());"
)
self.write(
"unrecognized.serialize(&mut std::io::Cursor::new(&mut self._unrecognized))?;"
)
self.write("Ok(())")

with block(self, "impl ::pb_jelly::Reflection for " + name):
Expand Down Expand Up @@ -1594,9 +1609,58 @@ def gen_msg(
with block(self, "_ =>"):
self.write('panic!("unknown field name given")')

if has_extensions:
with block(self, "impl ::pb_jelly::extensions::Extensible for " + name):
with block(
self,
"fn _extensions(&self) -> &::pb_jelly::Unrecognized",
):
self.write("&self._extensions")

def gen_extension(
self,
path: List[Text],
extension_field: FieldDescriptorProto,
scl: SourceCodeLocation,
) -> None:
crate, mod_parts = self.ctx.crate_from_proto_filename(self.proto_file.name)

self.write_comments(self.source_code_info_by_scl.get(tuple(scl)))
name = ("_".join(path + [extension_field.name])).upper()
rust_type = self.rust_type(None, extension_field)
extendee = self.ctx.find(extension_field.extendee)
kind = (
"RepeatedExtension"
if extension_field.label == FieldDescriptorProto.LABEL_REPEATED
else "SingularExtension"
)

self.write(
"""pub const {name}: ::pb_jelly::extensions::{kind}<{extendee}, {field_type}> =
::pb_jelly::extensions::{kind}::new(
{field_number},
::pb_jelly::wire_format::Type::{wire_format},
"{raw_name}",
);""".format(
name=name,
extendee=extendee.rust_name(crate, mod_parts),
field_type=rust_type.rust_type(),
kind=kind,
field_number=extension_field.number,
wire_format=rust_type.wire_format(),
raw_name=extension_field.name,
)
)

def walk(proto: FileDescriptorProto) -> WalkRet:
enums, messages = [], []

def walk(
proto: FileDescriptorProto,
) -> Tuple[
List[Tuple[List[Text], EnumDescriptorProto, SourceCodeLocation]],
List[Tuple[List[Text], DescriptorProto, SourceCodeLocation]],
List[Tuple[List[Text], FieldDescriptorProto, SourceCodeLocation]],
]:
enums, messages, extensions = [], [], []

def _walk(
proto: ProtoTypes, parents: List[Text], scl_prefix: SourceCodeLocation
Expand All @@ -1613,6 +1677,15 @@ def _walk(
for i, nested_message in enumerate(proto.nested_type):
ntfn = DescriptorProto.NESTED_TYPE_FIELD_NUMBER
_walk(nested_message, parents + [proto.name], scl_prefix + [ntfn, i])

for i, nested_extension in enumerate(proto.extension):
extensions.append(
(
parents + [proto.name],
nested_extension,
scl_prefix + [DescriptorProto.EXTENSION_FIELD_NUMBER, i],
)
)
elif isinstance(proto, FileDescriptorProto):
for i, enum_type in enumerate(proto.enum_type):
etfn = FileDescriptorProto.ENUM_TYPE_FIELD_NUMBER
Expand All @@ -1622,8 +1695,17 @@ def _walk(
mtfn = FileDescriptorProto.MESSAGE_TYPE_FIELD_NUMBER
_walk(message_type, parents, scl_prefix + [mtfn, i])

for i, nested_extension in enumerate(proto.extension):
extensions.append(
(
parents,
nested_extension,
scl_prefix + [FileDescriptorProto.EXTENSION_FIELD_NUMBER, i],
)
)

_walk(proto, [], [])
return enums, messages
return enums, messages, extensions


M = TypeVar("M", DescriptorProto, EnumDescriptorProto)
Expand Down Expand Up @@ -1755,6 +1837,11 @@ def calc_impls(
if msg_type.typ.options.Extensions[extensions_pb2.preserve_unrecognized]:
impls_copy = False # Preserve unparsed has a Vec which is not Copy

if len(msg_type.typ.extension_range) > 0:
# `Unrecognized` is neither Copy nor Eq
impls_eq = False
impls_copy = False

for field in msg_type.typ.field:
typ = field.type
rust_type = RustType(self, msg_type.proto_file, msg_type.typ, field)
Expand Down Expand Up @@ -1810,6 +1897,7 @@ def calc_impls(
if msg_type.typ.options.Extensions[
extensions_pb2.preserve_unrecognized
]:
# TODO: this check isn't really necessary, but it is useful
assert field_type.typ.options.Extensions[
extensions_pb2.preserve_unrecognized
], (
Expand Down Expand Up @@ -1844,7 +1932,7 @@ def calc_impls(
)

def feed(self, proto_file: FileDescriptorProto, to_generate: List[Text]) -> None:
enums, messages = walk(proto_file)
enums, messages, extensions = walk(proto_file)

for name in to_generate:
crate, _ = self.crate_from_proto_filename(name)
Expand All @@ -1865,6 +1953,8 @@ def feed(self, proto_file: FileDescriptorProto, to_generate: List[Text]) -> None
# so it suffices to examine one file at a time for the purposes of `box_recursive_fields`
box_recursive_fields(message_types)

crate, _ = self.crate_from_proto_filename(proto_file.name)

for path, typ, _ in messages:
msg_pt = ProtoType(self, proto_file, path, typ)

Expand All @@ -1879,6 +1969,17 @@ def edges(type_name: Text) -> List[Text]:

self.scc.process(msg_pt.proto_name(), edges, self.calc_impls)

if crate in self.deps_map:
for path, field, _ in extensions:
for type_name in [field.type_name, field.extendee]:
if type_name:
field_type = self.find(type_name)
dep_crate, _ = self.crate_from_proto_filename(
field_type.proto_file.name
)
if dep_crate != crate:
self.deps_map[crate].add(dep_crate)

def find_enum(self, typename: Text) -> ProtoType[EnumDescriptorProto]:
pt = self.find(typename)
assert isinstance(pt.typ, EnumDescriptorProto)
Expand Down Expand Up @@ -2124,7 +2225,7 @@ def add_mod(writer: CodeWriter) -> None:
if writer.derive_serde:
derive_serde = True

enums, messages = walk(proto_file)
enums, messages, extensions = walk(proto_file)

for path, enum_typ, scl in enums:
writer.gen_enum(path, enum_typ, scl)
Expand All @@ -2134,6 +2235,10 @@ def add_mod(writer: CodeWriter) -> None:
writer.gen_msg(path, msg_typ, scl)
writer.write("")

for path, extension_field, scl in extensions:
writer.gen_extension(path, extension_field, scl)
writer.write("")

add_mod(writer=writer)

# Note that output filenames must use "/" even on windows. It is part of the
Expand Down
Loading
Loading