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https://github.com/obmarg/cynic

A bring your own types GraphQL client library for Rust
https://github.com/obmarg/cynic

gql graphql graphql-client graphql-library graphql-query macros rust

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A bring your own types GraphQL client library for Rust

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Cynic



  


    A bring your own types GraphQL client for Rust

  



  


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# Overview



Cynic is a GraphQL library for Rust. It's not the first but it takes a

different approach from the existing libraries.



Existing libraries take a query first approach to GQL - you write a query using

GraphQL and libraries use that to generate Rust structs for you using macros.

This is really easy and great for getting going quickly. However, if you want

to use structs that aren't quite what the macros output you're out of luck.

Some more complex use cases like sharing structs among queries are also

commonly not supported.



Cynic takes a different approach - it uses Rust structs to define queries and

generates GraphQL from them. This gives you freedom to control the structs

you'll be working with while still enjoying type safe queries, checked against

the GraphQL schema. When its built in `derives` don't do exactly what you

want it provides lower level APIs to hook in and fetch the data you want in the

format you want to work with it.



Of course writing out all the structs to represent a large GraphQL query can be

quite challenging, and GraphQL has excellent tooling for building queries

usually. Cynic provides [`querygen`][1] to help with this - you write a

GraphQL query using the existing GQL tooling and it'll generate some cynic

structs to make that query. You can use this as a starting point for your

projects - either adding on to the rust structs directly, or re-using

`querygen` as appropriate.



### Features



Cynic is currently a work in progress, but the following features are

supported:



- Typesafe queries & mutations.

- Defining custom scalars.

- Building dynamic (but still type checked) queries at run time.

- Query arguments including input objects

- Interfaces & union types

- Introspection via [`cynic-cli`][6] or [`cynic-introspection`][7]

- GraphQL Subscriptions via [`graphql-ws-client`][8].



The following features are not currently supported, but may be one day.



- Directives

- Potentially other things (please open an issue if you find anything obviously

  missing)



### Documentation



Cynic is documented in a few places:



1. There's a guide to using cynic on [cynic-rs.dev](https://cynic-rs.dev)

2. The reference documentation on [docs.rs](https://docs.rs/cynic)



### Inspiration



- [graphql-client][2], the original Rust GraphQL client. This is a great

  library for using GraphQL from Rust. It wasn't quite what I wanted but it

  might be what you want.

- The idea of encoding the GraphQL typesystem into a DSL was taken from

  [elm-graphql][3].

- Most of the JSON decoding APIs were taken from [Json.Decode in Elm][4].

- Deriving code from structs is a fairly common Rust pattern, though [serde][5]

  in particular provided inspiration for the derive APIs.



[1]: https://generator.cynic-rs.dev

[2]: https://github.com/graphql-rust/graphql-client

[3]: https://github.com/dillonkearns/elm-graphql

[4]: https://package.elm-lang.org/packages/elm/json/latest/Json.Decode

[5]: https://serde.rs

[6]: https://crates.io/crates/cynic-cli

[7]: https://crates.io/crates/cynic-introspection

[8]: https://github.com/obmarg/graphql-ws-client