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Diana.jl

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GraphQL for Julia

// repository documentation

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# Diana.jl
<img src="diana_logo.png" width="25%" >

A Julia GraphQL client/server implementation.
 
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#### Contributions welcomed!

This repository is an implementation of a GraphQL server, a query language for API created by Facebook.
See more complete documentation at http://graphql.org/

Looking for help? Find resources from the community.

### Getting Started
An overview of GraphQL in general is available in the [README](https://github.com/facebook/graphql/blob/master/README.md) for the Specification for GraphQL.

This package is intended to help you building GraphQL schemas/types fast and easily.
+ **Easy to use:** Diana.jl helps you use GraphQL in Julia without effort.
+ **Data agnostic:** Diana.jl supports any type of data source: SQL, NoSQL, etc. The intent is to provide a complete API and make your data available through GraphQL.
+ **Make queries:** Diana.jl allows queries to graphql schemas.

## Installation

```julia
Pkg> add Diana
#Release
pkg> add Diana#master
#Development
```

## Examples
Client
-------
```julia
query = """
{
  neomatrix{
    nombre
    linkedin
  }
}
"""

r = Queryclient("https://neomatrix.herokuapp.com/graphql",query)
```

```julia
client = GraphQLClient("https://api.graph.cool/simple/v1/movies",auth="Bearer my-jwt-token")

query2 = """
query getMovie(\$title: String!) {
  Movie(title:\$title) {
    releaseDate
    actors {
      name
    }
  }
}
"""
r = client.Query(query2,vars=Dict("title" => "Inception"))

r.Data 
# "{\"data\":{\"Movie\":{\"releaseDate\":\"2010-08-28T20:00:00.000Z\",\"actors\":[{\"name\":\"Leonardo DiCaprio\"},{\"name\":\"Ellen Page\"},{\"name\":\"Tom Hardy\"},{\"name\":\"Joseph Gordon-Levitt\"},{\"name\":\"Marion Cotillard\"}]}}}"

```

Server
-------
Here is one example for you to get started:

```julia
schema = Dict(
"query" => "Query"

,"Query"=> Dict(
    "persona"=>Dict("tipo"=>"Persona")
   ,"neomatrix"=>Dict("tipo"=>"Persona")
   )

,"Persona" => Dict(
    "edad"=>Dict("tipo"=>"Int")
   ,"nombre"=>Dict("tipo"=>"String")
  )

)

resolvers=Dict(
    "Query"=>Dict(
        "neomatrix" => (root,args,ctx,info)->(return Dict("nombre"=>"josue","edad"=>26))
        ,"persona" => (root,args,ctx,info)->(return Dict("nombre"=>"Diana","edad"=>25))
    )
    ,"Persona"=>Dict(
      "edad" => (root,args,ctx,info)->(return root["edad"])
    )
)

my_schema = Schema(schema, resolvers)
```

Then Querying `Diana.Schema` is as simple as:

```julia
query= """
{
  neomatrix{
  	nombre
  }
}
"""
result = my_schema.execute(query)
# "{\"data\":{\"neomatrix\":{\"nombre\":\"josue\"}}}"
```
## TODO
- [x] Client
- [x] Lexer
- [x] Parser
- [x] Query validation
- [x] Schemas / Types
- [x] Query execution
  - [x] Arguments
  - [x] Scalar types
  - [x] Multiple forms of resolution
  - [x] Extract variable values
  - [ ] Complex types (List, Object, etc)
  - [ ] Fragments in queries
  - [ ] Directives
- [x] Mutation execution
- [ ] Subscriptions execution
- [ ] Introspection
- [ ] Depth of the query
- [ ] Middleware

## Documentation

Documentation and links to additional resources are available at
https://neomatrixcode.gitbook.io/diana/

Diana.jl

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