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Add support for the canonical introspection query
Fixes graphql-rust#307.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| # Introspection | ||
|
|
||
| GraphQL defines a special built-in top-level field called `__schema`. Querying | ||
| for this field allows one to [introspect the schema](https://graphql.org/learn/introspection/) | ||
| at runtime to see what queries and mutations the GraphQL server supports. | ||
|
|
||
| Because introspection queries are just regular GraphQL queries, Juniper supports | ||
| them natively. For example, to get all the names of the types supported one | ||
| could execute the following query against Juniper: | ||
|
|
||
| ```graphql | ||
| { | ||
| __schema { | ||
| types { | ||
| name | ||
| } | ||
| } | ||
| } | ||
| ``` | ||
|
|
||
| ## Schema introspection output as JSON | ||
|
|
||
| Many client libraries and tools in the GraphQL ecosystem require a complete | ||
| representation of the server schema. Often this representation is in JSON and | ||
| referred to as `schema.json`. A complete representation of the schema can be | ||
| produced by issuing a specially crafted introspection query. | ||
|
|
||
| Juniper provides a convenience function to introspect the entire schema. The | ||
| result can then be converted to JSON for use with tools and libraries such as | ||
| [graphql-client](https://github.com/graphql-rust/graphql-client): | ||
|
|
||
| ```rust | ||
| # // Only needed due to 2018 edition because the macro is not accessible. | ||
| # extern crate juniper; | ||
| # extern crate serde_json; | ||
| use juniper::{EmptyMutation, FieldResult, IntrospectionFormat}; | ||
|
|
||
| // Define our schema. | ||
|
|
||
| #[derive(juniper::GraphQLObject)] | ||
| struct Example { | ||
| id: String, | ||
| } | ||
|
|
||
| struct Context; | ||
| impl juniper::Context for Context {} | ||
|
|
||
| struct Query; | ||
|
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| juniper::graphql_object!(Query: Context |&self| { | ||
| field example(&executor, id: String) -> FieldResult<Example> { | ||
| unimplemented!() | ||
| } | ||
| }); | ||
|
|
||
| type Schema = juniper::RootNode<'static, Query, EmptyMutation<Context>>; | ||
|
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| fn main() { | ||
| // Create a context object. | ||
| let ctx = Context{}; | ||
|
|
||
| // Run the built-in introspection query. | ||
| let (res, _errors) = juniper::introspect( | ||
| &Schema::new(Query, EmptyMutation::new()), | ||
| &ctx, | ||
| IntrospectionFormat::default(), | ||
| ).unwrap(); | ||
|
|
||
| // Convert introspection result to json. | ||
| let json_result = serde_json::to_string_pretty(&res); | ||
| assert!(json_result.is_ok()); | ||
| } | ||
| ``` |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,6 +1,6 @@ | ||
| extern crate skeptic; | ||
|
|
||
| fn main() { | ||
| let files = skeptic::markdown_files_of_directory("../content/types"); | ||
| let files = skeptic::markdown_files_of_directory("../content/"); | ||
| skeptic::generate_doc_tests(&files); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,19 @@ | ||
| /// From <https://github.com/graphql/graphql-js/blob/8c96dc8276f2de27b8af9ffbd71a4597d483523f/src/utilities/introspectionQuery.js#L21>s | ||
| pub(crate) const INTROSPECTION_QUERY: &str = include_str!("./query.graphql"); | ||
| pub(crate) const INTROSPECTION_QUERY_WITHOUT_DESCRIPTIONS: &str = | ||
| include_str!("./query_without_descriptions.graphql"); | ||
|
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| /// The desired GraphQL introspection format for the canonical query | ||
| /// (<https://github.com/graphql/graphql-js/blob/8c96dc8276f2de27b8af9ffbd71a4597d483523f/src/utilities/introspectionQuery.js#L21>) | ||
| pub enum IntrospectionFormat { | ||
| /// The canonical GraphQL introspection query. | ||
| All, | ||
| /// The canonical GraphQL introspection query without descriptions. | ||
| WithoutDescriptions, | ||
| } | ||
|
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||
| impl Default for IntrospectionFormat { | ||
| fn default() -> Self { | ||
| IntrospectionFormat::All | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| query IntrospectionQuery { | ||
| __schema { | ||
| queryType { | ||
| name | ||
| } | ||
| mutationType { | ||
| name | ||
| } | ||
| subscriptionType { | ||
| name | ||
| } | ||
| types { | ||
| ...FullType | ||
| } | ||
| directives { | ||
| name | ||
| description | ||
| locations | ||
| args { | ||
| ...InputValue | ||
| } | ||
| } | ||
| } | ||
| } | ||
| fragment FullType on __Type { | ||
| kind | ||
| name | ||
| description | ||
| fields(includeDeprecated: true) { | ||
| name | ||
| description | ||
| args { | ||
| ...InputValue | ||
| } | ||
| type { | ||
| ...TypeRef | ||
| } | ||
| isDeprecated | ||
| deprecationReason | ||
| } | ||
| inputFields { | ||
| ...InputValue | ||
| } | ||
| interfaces { | ||
| ...TypeRef | ||
| } | ||
| enumValues(includeDeprecated: true) { | ||
| name | ||
| description | ||
| isDeprecated | ||
| deprecationReason | ||
| } | ||
| possibleTypes { | ||
| ...TypeRef | ||
| } | ||
| } | ||
| fragment InputValue on __InputValue { | ||
| name | ||
| description | ||
| type { | ||
| ...TypeRef | ||
| } | ||
| defaultValue | ||
| } | ||
| fragment TypeRef on __Type { | ||
| kind | ||
| name | ||
| ofType { | ||
| kind | ||
| name | ||
| ofType { | ||
| kind | ||
| name | ||
| ofType { | ||
| kind | ||
| name | ||
| ofType { | ||
| kind | ||
| name | ||
| ofType { | ||
| kind | ||
| name | ||
| ofType { | ||
| kind | ||
| name | ||
| ofType { | ||
| kind | ||
| name | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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