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fix(openapi): describe the JSON the proxy writes - #149
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Check name Status Explanation Title check The title clearly and concisely describes the main change: updating OpenAPI output to match the JSON written by the proxy. Linked Issues check Issue #148requires response schemas to match serialized JSON and requiresNullValuequery parameters to retainNULL_VALUE. The changes use JSON field names, represent body and response `NullValue…Out of Scope Changes check The changes remain within the stated OpenAPI generation scope. Recursive query-parameter documentation, UInt64Valueformatting, well-known JSON handling, and the visibility changes support accurate …Description check The pull request description directly matches the changes. It covers OpenAPI JSON schemas, query parameter generation, protobuf well-known types, response bodies, and the added tests. Full details: Linked Issues check
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Explanation
Issue
#148requires response schemas to match serialized JSON and requiresNullValuequery parameters to retainNULL_VALUE. The changes use JSON field names, represent body and responseNullValueas{nullable: true, enum: [null]}, preserve the parameter enum, and constrain an emptyresponse_bodytonull.every_response_validates_against_its_schemachecks serialized fixtures, wire keys, references, arrays, maps, and scalar formats.
Full details: Out of Scope Changes check
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Explanation
The changes remain within the stated OpenAPI generation scope. Recursive query-parameter documentation,
UInt64Valueformatting, well-known JSON handling, and the visibility changes support accurate schema generation or its automated tests. No unrelated change is shown, and no files were excluded from review.
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Review comments at @src/openapi/tests.rs:
- Around line 696-701: Extend the Wire response sampling test after the variant
loop with an empty DynamicMessage built from wire, serialize it through
transcode::json_body, and pass the parsed value to check_wire with a distinct
default-sample label to validate emitted default-valued scalar and enum fields.
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src/openapi.rssrc/openapi/tests.rssrc/transcode/mod.rs
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Review comments at @src/openapi.rs:
- Around line 416-417: Update the Kind::Message handling so field.is_list() is
checked for every message field before selecting the string-form branch;
repeated messages must be omitted from query parameters even when they have a
string form. Preserve the existing handling for non-repeated message fields.
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src/openapi.rssrc/openapi/tests.rssrc/transcode/request.rssrc/transcode/request/presence.rs
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- google.protobuf.NullValue fields (singular, oneof member, list item,
map value) are documented as JSON null ({nullable: true, enum: [null]};
OpenAPI 3.0.3 has no null type) instead of the string NULL_VALUE;
path and query parameters keep the enum name the parser reads
- object properties are keyed by the field's JSON name, which responses
use; requests accept both spellings
- google.protobuf.UInt64Value is format uint64, not int64
- a response_body path naming no field is described as only null
- a test serializes sample messages through the unary response path and
validates them against the generated schema
Closes #148
- a field below a message-typed query field is its own parameter named by the dotted path the query parser reads (filter.q), typed as the leaf, instead of an object parameter whose $ref pointed at the JSON body schema; a nested NullValue is now NULL_VALUE there, not null - maps and repeated messages, which a query string cannot set, are no longer listed; a message already on the way is not entered again - the schema/wire test also checks a message with every field default Regression tests: message_typed_query_field_is_one_parameter_per_leaf, query_parameters_are_the_keys_the_parser_reads, and the nested case in null_value_is_json_null_in_bodies_and_a_name_in_parameters.
- a query parameter is a whole well-known type only when the parser can read it from one string (Timestamp, Duration, FieldMask, wrappers, Value); Any, Struct, ListValue and Empty are walked like any message, so Any shows payload.type_url and payload.value and ListValue shows its repeated values - a Value read from a query string is documented as a string Regression test: query_parameters_are_the_keys_the_parser_reads.
Every google.protobuf message was handled as a well-known type by its package prefix, so an ordinary one such as SourceContext was an empty object in bodies and a single query parameter. Well-known now means the types ProtoJSON writes in their own form, the same list the request parser reads by; a query parameter is a whole message only for the explicit list of types with a string form. Regression tests: an_ordinary_google_protobuf_message_has_its_own_schema and the SourceContext case in query_parameters_are_the_keys_the_parser_reads.
A repeated well-known type with a string form (repeated Timestamp, ListValue.values) is set from the query one value per repeated key, so it stays a documented parameter. A test now checks that the spec describes it as an array and that the parser binds every value, and the comments say which repeated messages a query string cannot set.
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## 🤖 New release * `structured-proxy`: 8.1.2 -> 8.1.3 (✓ API compatible changes) <details><summary><i><b>Changelog</b></i></summary><p> <blockquote> ## [8.1.3](v8.1.2...v8.1.3) - 2026-10-19 ### Fixed - *(openapi)* describe the JSON the proxy writes ([#149](#149)) ### Other - *(deps)* bump taiki-e/install-action from 2.87.24 to 2.87.29 ([#146](#146)) - auto-merge minor and patch Dependabot updates ([#151](#151)) </blockquote> </p></details> --- This PR was generated with [release-plz](https://github.com/release-plz/release-plz/). Co-authored-by: sw-release-bot[bot] <255865126+sw-release-bot[bot]@users.noreply.github.com>
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Summary
Changes
google.protobuf.NullValuein bodies and responses (singular, oneof member, list item, map value) is JSONnull:{nullable: true, enum: [null]}, since OpenAPI 3.0.3 has nonulltype andnullablewithouttypeconstrains nothing. In path and query parameters it is the enum nameNULL_VALUE, which the parameter parser reads. Same defect as fix(openapiv3): emit google.protobuf.NullValue fields as null grpc-ecosystem/grpc-gateway#7541.displayName), which responses use; requests accept both spellings.filter.q). Well-known types with a string form (Timestamp, Duration, FieldMask, wrappers, Value) are one parameter, repeated ones one value per repeated key; other messages are walked field by field. Maps and repeated messages without a string form, which a query string cannot set, are not listed.google.protobuf.UInt64Valueisformat: uint64.response_bodypath that names no field is described as onlynull.Clients generated from the spec see camelCase property names for multi-word fields, matching the responses they already receive.
Testing
Sample messages covering every scalar, enum, well-known type, oneof member, list and map go through the unary response serializer and are validated against the generated schema. fmt, clippy, the full test suite and doc tests pass.
Closes #148