GraphQL Tracing

Ruby implementation of GraphQL trace data in the Apollo Tracing format.

Installation

Add this line to your application's Gemfile:

gem 'graphql-tracing'

And then execute:

$ bundle

Or install it yourself as:

$ gem install graphql-tracing

Usage

Define a GraphQL schema:

# Define a type
PostType = GraphQL::ObjectType.define do
  name "Post"

  field :id, !types.ID
  field :title, !types.String
end

# Define a query
QueryType = GraphQL::ObjectType.define do
  name "Query"

  field :posts, !types[PostType] do
    argument :user_id, !types.ID
    resolve ->(obj, args, ctx) { Post.where(user_id: args[:user_id]) }
  end
end

# Define a schema
Schema = GraphQL::Schema.define do
  query QueryType
end

# Execute query
query = "query($user_id: ID!) {
          posts(user_id: $user_id) {
            id
            title
          }
        }"
Schema.execute(query, variables: { user_id: 1 })

Setup Tracing

Add 'GraphQL::Tracing' to your schema:

Schema = GraphQL::Schema.define do
  query QueryType
  <b>use GraphQL::Tracing.new</b>
end

Now your response should look something like:

{
   "data":{
      "posts":[
         {
            "id":"1",
            "title":"Post Title"
         }
      ]
   },
   "extensions":{
      "tracing":{
         "version":1,
         "startTime":"2017-08-25T19:55:04.821Z",
         "endTime":"2017-08-25T19:55:04.823Z",
         "duration":1702785,
         "execution":{
            "resolvers":[
               {
                  "path":[
                     "posts"
                  ],
                  "parentType":"Query",
                  "fieldName":"posts",
                  "returnType":"[Post!]!",
                  "startOffset":1451015,
                  "duration":15735
               },
               {
                  "path":[
                     "posts",
                     0,
                     "id"
                  ],
                  "parentType":"Post",
                  "fieldName":"id",
                  "returnType":"ID!",
                  "startOffset":1556873,
                  "duration":6914
               },
               {
                  "path":[
                     "posts",
                     0,
                     "title"
                  ],
                  "parentType":"Post",
                  "fieldName":"title",
                  "returnType":"String!",
                  "startOffset":1604795,
                  "duration":4053
               },
               {
                  "path":[
                     "posts",
                     0,
                     "user_id"
                  ],
                  "parentType":"Post",
                  "fieldName":"user_id",
                  "returnType":"ID!",
                  "startOffset":1642942,
                  "duration":3814
               }
            ]
         }
      }
   }
}

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/graphql-tracing. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

The gem is available as open source under the terms of the MIT License.