HTTP::StateError: body has already been consumed

[petecheslock]

When running the latest AppMap gem on the Mastodon project, a handful of rspec tests will fail when APPMAP=true and will pass when APPMAP=false.

My Appmap yaml

---
name: mastodon
language: ruby
appmap_dir: tmp/appmap
packages:
- path: app
- path: lib
exclude:
- Request::ClientLimit#body_with_limit
- Request::ClientLimit#truncated_body
- ActivityPub::FetchRepliesWorker#perform

Stack Trace of Error

 1) ActivityPub::FetchRepliesWorker perform performs a request if the collection URI is from the same host
     Failure/Error: while (chunk = readpartial)
     
     HTTP::StateError:
       body has already been consumed
     # ./.bundle/ruby/3.0.0/gems/http-5.1.1/lib/http/response/body.rb:67:in `stream!'
     # ./.bundle/ruby/3.0.0/gems/http-5.1.1/lib/http/response/body.rb:29:in `readpartial'
     # ./app/lib/request.rb:170:in `truncated_body'
     # ./app/lib/request.rb:183:in `body_with_limit'
     # ./app/helpers/jsonld_helper.rb:179:in `block in fetch_resource_without_id_validation'
     # ./app/lib/request.rb:73:in `perform'
     # ./.bundle/ruby/3.0.0/gems/appmap-0.100.0/lib/appmap/hook/method/ruby3.rb:40:in `bind_call'
     # ./.bundle/ruby/3.0.0/gems/appmap-0.100.0/lib/appmap/hook/method/ruby3.rb:40:in `do_call'
     # ./.bundle/ruby/3.0.0/gems/appmap-0.100.0/lib/appmap/hook/method/ruby3.rb:49:in `trace_call'
     # ./.bundle/ruby/3.0.0/gems/appmap-0.100.0/lib/appmap/hook/method/ruby3.rb:16:in `call'
     # ./.bundle/ruby/3.0.0/gems/appmap-0.100.0/lib/appmap/hook/method/ruby3.rb:63:in `block in hook_method_def'
     # ./app/helpers/jsonld_helper.rb:176:in `fetch_resource_without_id_validation'
     # ./.bundle/ruby/3.0.0/gems/appmap-0.100.0/lib/appmap/hook/method/ruby3.rb:40:in `bind_call'
     # ./.bundle/ruby/3.0.0/gems/appmap-0.100.0/lib/appmap/hook/method/ruby3.rb:40:in `do_call'
     # ./.bundle/ruby/3.0.0/gems/appmap-0.100.0/lib/appmap/hook/method/ruby3.rb:49:in `trace_call'
     # ./.bundle/ruby/3.0.0/gems/appmap-0.100.0/lib/appmap/hook/method/ruby3.rb:16:in `call'
     # ./.bundle/ruby/3.0.0/gems/appmap-0.100.0/lib/appmap/hook/method/ruby3.rb:63:in `block in hook_method_def'
     # ./app/services/activitypub/fetch_replies_service.rb:39:in `fetch_collection'
     # ./app/services/activitypub/fetch_replies_service.rb:21:in `collection_items'
     # ./app/services/activitypub/fetch_replies_service.rb:10:in `call'
     # ./app/workers/activitypub/fetch_replies_worker.rb:10:in `perform'
     # ./spec/workers/activitypub/fetch_replies_worker_spec.rb:25:in `block (3 levels) in <top (required)>'
     # ./.bundle/ruby/3.0.0/gems/appmap-0.100.0/lib/appmap/rspec.rb:251:in `instance_exec'
     # ./.bundle/ruby/3.0.0/gems/appmap-0.100.0/lib/appmap/rspec.rb:251:in `block in wrap_example_block'
     # ./.bundle/ruby/3.0.0/gems/webmock-3.18.1/lib/webmock/rspec.rb:37:in `block (2 levels) in <top (required)>'

To recreate:
Clone the forked version of Mastodon
Start docker and run

$ docker-compose up -d db redis 

Source the rspec env vars

$ source .env-rspec      

Setup the DB

bundle exec rails db:setup

Run one of the tests that will fail:

RAILS_ENV=test DISABLE_SPRING=true bundle exec rspec ./spec/workers/activitypub/fetch_replies_worker_spec.rb