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Add versioning to JSON serializer

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This commit is contained in:
Tim Wojtulewicz 2025-04-07 16:11:15 -07:00
parent dbb3144e2d
commit 9593db1974
3 changed files with 22 additions and 6 deletions
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2
src/storage/Serializer.h
View file

@ -36,8 +36,6 @@ public:
protected:
Serializer(std::string name) : name(std::move(name)) {}
private:
std::string name;
};

23
src/storage/serializer/json/JSON.cc
View file

@ -6,24 +6,39 @@
namespace zeek::storage::serializer::json {
std::string JSON::versioned_name = "JSONv1";
std::unique_ptr<Serializer> JSON::Instantiate() { return std::make_unique<JSON>(); }
JSON::JSON() : Serializer("JSON") {}
std::optional<byte_buffer> JSON::Serialize(ValPtr val) {
static auto byte_converter = [](u_char c) { return std::byte(c); };
byte_buffer buf;
auto json = val->ToJSON();
buf.reserve(json->Len());
buf.reserve(json->Len() + versioned_name.size() + 1);
std::transform(json->Bytes(), json->Bytes() + json->Len(), std::back_inserter(buf),
[](u_char c) { return std::byte(c); });
std::transform(versioned_name.begin(), versioned_name.end(), std::back_inserter(buf), byte_converter);
buf.push_back(static_cast<std::byte>(';'));
std::transform(json->Bytes(), json->Bytes() + json->Len(), std::back_inserter(buf), byte_converter);
return buf;
}
zeek::expected<ValPtr, std::string> JSON::Unserialize(byte_buffer_span buf, TypePtr type) {
std::string_view text{reinterpret_cast<std::string::const_pointer>(buf.data()), buf.size()};
return zeek::detail::ValFromJSON(text, type, Func::nil);
auto semicolon = text.find(';');
if ( semicolon == std::string::npos )
return zeek::unexpected<std::string>("Version string missing");
std::string_view version = std::string_view(text).substr(0, semicolon);
if ( version != versioned_name )
return zeek::unexpected<std::string>(
util::fmt("Version doesn't match: %s vs %s", version.data(), versioned_name.c_str()));
return zeek::detail::ValFromJSON(text.substr(semicolon + 1), type, Func::nil);
}
} // namespace zeek::storage::serializer::json

3
src/storage/serializer/json/JSON.h
View file

@ -15,6 +15,9 @@ public:
std::optional<byte_buffer> Serialize(ValPtr val) override;
zeek::expected<ValPtr, std::string> Unserialize(byte_buffer_span buf, TypePtr type) override;
private:
static std::string versioned_name;
};
} // namespace zeek::storage::serializer::json