morpheus-graphql
Morpheus GraphQL
| Version on this page: | 0.20.1 |
| LTS Haskell 21.25: | 0.27.3 |
| Stackage Nightly 2023-06-21: | 0.27.3 |
| Latest on Hackage: | 0.27.3 |
morpheus-graphql-0.20.1@sha256:2eb0f1fa898d5ef83eaa1607deffb499b10cd04115e0fba64c692073ff0f235e,36529Module documentation for 0.20.1
Morpheus GraphQL 
Build GraphQL APIs with your favorite functional language!
Morpheus GraphQL (Server & Client) helps you to build GraphQL APIs in Haskell with native Haskell types. Morpheus will convert your Haskell types to a GraphQL schema and all your resolvers are just native Haskell functions. Morpheus GraphQL can also convert your GraphQL Schema or Query to Haskell types and validate them in compile time.
Morpheus is still in an early stage of development, so any feedback is more than welcome, and we appreciate any contribution! Just open an issue here on GitHub, or join our Slack channel to get in touch.
Please note that this readme file provides only a brief introduction to the library. If you are interested in more advanced topics, visit Docs.
Getting Started
Setup
To get started with Morpheus, you first need to add it to your project’s dependencies, as follows (assuming you’re using hpack):
package.yml
dependencies:
- morpheus-graphql
Additionally, you should tell stack which version to pick:
stack.yml
resolver: lts-16.2
extra-deps:
- morpheus-graphql-0.17.0
- morpheus-graphql-app-0.17.0
- morpheus-graphql-core-0.17.0
As Morpheus is quite new, make sure stack can find morpheus-graphql by running stack upgrade and stack update
Building your first GraphQL API
with GraphQL syntax
schema.gql
type Query {
deity(name: String! = "Morpheus"): Deity!
}
"""
Description for Deity
"""
type Deity {
"""
Description for name
"""
name: String!
power: String @deprecated(reason: "some reason for")
}
API.hs
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE DuplicateRecordFields #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeFamilies #-}
module API (api) where
import Data.ByteString.Lazy.Char8 (ByteString)
import Data.Morpheus (interpreter)
import Data.Morpheus.Document (importGQLDocument)
import Data.Morpheus.Types (RootResolver (..), Undefined (..))
import Data.Text (Text)
importGQLDocument "schema.gql"
rootResolver :: RootResolver IO () Query Undefined Undefined
rootResolver =
RootResolver
{ queryResolver = Query {deity},
mutationResolver = Undefined,
subscriptionResolver = Undefined
}
where
deity DeityArgs {name} =
pure
Deity
{ name = pure name,
power = pure (Just "Shapeshifting")
}
api :: ByteString -> IO ByteString
api = interpreter rootResolver
Template Haskell Generates types: Query , Deity, DeityArgs, that can be used by rootResolver
descriptions and deprecations will be displayed in introspection.
importGQLDocumentWithNamespace will generate Types with namespaced fields. If you don’t need namespace use importGQLDocument
with Native Haskell Types
To define a GraphQL API with Morpheus we start by defining the API Schema as a native Haskell data type,
which derives the Generic type class. Using the DeriveAnyClass language extension we then also derive instances for the GQLType type class. Lazily resolvable fields on this Query type are defined via a -> ResolverQ () IO b, representing resolving a set of arguments a to a concrete value b.
data Query m = Query
{ deity :: DeityArgs -> m Deity
} deriving (Generic, GQLType)
data Deity = Deity
{ fullName :: Text -- Non-Nullable Field
, power :: Maybe Text -- Nullable Field
} deriving (Generic, GQLType)
data DeityArgs = DeityArgs
{ name :: Text -- Required Argument
, mythology :: Maybe Text -- Optional Argument
} deriving (Generic, GQLType)
For each field in the Query type defined via a -> m b (like deity) we will define a resolver implementation that provides the values during runtime by referring to
some data source, e.g. a database or another API. Fields that are defined without a -> m b you can just provide a value.
In above example, the field of DeityArgs could also be named using reserved identities (such as: type, where, etc), in order to avoid conflict, a prime symbol (') must be attached. For example, you can have:
data DeityArgs = DeityArgs
{ name :: Text -- Required Argument
, mythology :: Maybe Text -- Optional Argument
, type' :: Text
} deriving (Generic, GQLType)
The field name in the final request will be type instead of type'. The Morpheus request parser converts each of the reserved identities in Haskell 2010 to their corresponding names internally. This also applies to selections.
resolveDeity :: DeityArgs -> ResolverQ () IO Deity
resolveDeity DeityArgs { name, mythology } = liftEither $ dbDeity name mythology
askDB :: Text -> Maybe Text -> IO (Either String Deity)
askDB = ...
To make this Query type available as an API, we define a RootResolver and feed it to the Morpheus interpreter. A RootResolver consists of query, mutation and subscription definitions, while we omit the latter for this example:
rootResolver :: RootResolver IO () Query Undefined Undefined
rootResolver =
RootResolver
{ queryResolver = Query {deity = resolveDeity}
, mutationResolver = Undefined
, subscriptionResolver = Undefined
}
gqlApi :: ByteString -> IO ByteString
gqlApi = interpreter rootResolver
As you can see, the API is defined as ByteString -> IO ByteString which we can either invoke directly or use inside an arbitrary web framework
such as scotty or serverless-haskell. We’ll go for scotty in this example:
main :: IO ()
main = scotty 3000 $ post "/api" $ raw =<< (liftIO . gqlApi =<< body)
If we now send a POST request to http://localhost:3000/api with a GraphQL Query as body for example in a tool like Insomnia:
query GetDeity {
deity (name: "Morpheus") {
fullName
power
}
}
our query will be resolved!
{
"data": {
"deity": {
"fullName": "Morpheus",
"power": "Shapeshifting"
}
}
}
Serverless Example
If you are interested in creating a Morpheus GraphQL API with Serverless, you should take a look at our example in this repository:
Mythology API it is our example project build with Morpheus GraphQL and Serverless-Haskell,
where you can query different mythology characters with GraphiQL.
Mythology API is deployed on : api.morpheusgraphql.com where you can test it with GraphiQL
Showcase
Below are the list of projects using Morpheus GraphQL. If you want to start using Morpheus GraphQL, they are good templates to begin with.
- https://github.com/morpheusgraphql/mythology-api
- Serverless Mythology API
- https://github.com/dandoh/web-haskell
- Modern webserver boilerplate in Haskell: Morpheus Graphql + Postgresql + Authentication + DB migration + Dotenv and more
Edit this section and send PR if you want to share your project.
About
The name
Morpheus is the greek god of sleep and dreams whose name comes from the greek word μορφή meaning form or shape. He is said to be able to mimic different forms and GraphQL is good at doing exactly that: Transforming data in the shape of many different APIs.
Team
Morpheus is written and maintained by nalchevanidze
Roadmap
- Medium future:
- Stabilize API
- Specification-isomorphic error handling
- Long term:
- Support all possible GQL features
- Performance optimization