apache/apisix

bug: grpc-transcode cant transcode empty array list to [] , but it did to {}

Open

#11,440 opened on Jul 26, 2024

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 (13 comments) (0 reactions) (1 assignee)Lua (16,597 stars) (2,860 forks)batch import
buggood first issue

Description

Current Behavior

when back to front server, grpc transcode plugin cant transcode empty list (array) to [] , but to {} . use grpc example demo : image

when list has content , it did well . image

Expected Behavior

response empty list expect to get [] . not {}

Error Logs

No response

Steps to Reproduce

  1. apisix 3.9 latest
  2. grpc server golang
  3. postman

Environment

  1. apisix 3.9 latest
  2. grpc server golang
  3. postman

Contributor guide

Tech stack
go
Domain
apibackend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
blocked
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
gRPCProtobufApache APISIXLua
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
Investigate the gRPC transcoding plugin in Apache APISIX (likely in the 'plugins/grpc transcode.lua' file). The issue is that when a gRPC response contains an empty repeated field, it is serialized as a JSON object '{}' instead of an empty array '[]'. Check the protobuf to JSON conversion logic, possibly in the encoding of repeated fields, and refer to the gRPC transcoding specification to fix the handling of empty arrays.