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Duct module.lacinia

A Duct module that adds a web server and Lacinia with ring-graphql-ui to a configuration.


To install, add the following to your project :dependencies:

[com.kakao.duct/duct-lacinia "0.1.0"]

Quick start for a new project

Use a Leiningen template:

lein new duct-lacinia myapp


To add this module to your configuration, add the :duct.module/lacinia key.

For example:

 {:schema {:enums
            {:description "The episodes of the original Star Wars trilogy."
             :values [:NEWHOPE :EMPIRE :JEDI]}}

            {:fields {:primary_functions {:type (list String)}
                      :id {:type Int}
                      :name {:type String}
                      :appears_in {:type (list :episode)}}}

            {:fields {:id {:type Int}
                      :name {:type String}
                      :home_planet {:type String}
                      :appears_in {:type (list :episode)}}}}

           {:hero {:type (non-null :human)
                   :args {:episode {:type :episode}}
                   :resolve :human/get-hero}
            :droid {:type :droid
                    :args {:id {:type String :default-value "2001"}}
                    :resolve :droid/get-droid}}}}}

The :schema should contain a map of Lacinia schema. See the document of Lacinia for more information on the format.

The module uses the :duct.core/project-ns key and the result key to find an appropriate Integrant key at:

<project-ns>.resolver.<result key namespace>/<result key name>

So in the above example, the project namespace is foo and the result namespaced key is :human/get-hero, so the module looks for a foo.resolver.human/get-hero Integrant key.

For example:

 {:duct.core/project-ns foo
  :foo.resolver.human/get-hero {}}}
(defmethod ig/init-key :foo.resolver.human/get-hero [_ _]
  (fn [context arguments value]
    (let [{:keys [episode]} arguments]
      (if (= episode :NEWHOPE)
        {:id 1000
         :name "Luke"
         :home_planet "Tatooine"
         :appears_in ["NEWHOPE" "EMPIRE" "JEDI"]}
        {:id 2000
         :name "Lando Calrissian"
         :home_planet "Socorro"
         :appears_in ["EMPIRE" "JEDI"]}))))

By default, the module uses the :duct.server.http/jetty key for the webserver, as supplied by the server.http.jetty library. However, if a key deriving from :duct.server/http already exists in the configuration, the module will use that instead.

The GraphiQL packaged inside the module is built usin using ring-graphql-ui. By default the endpoint is /graphiql, but you can specify it directly by setting the :graphiql key:

 {:graphiql {:endpoint "/mygraphiql"}}}


This software is licensed under the Apache 2 license, quoted below.

Copyright 2019 Kakao Corp.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this project except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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