1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139

use crate::context::Data;
use crate::model::__DirectiveLocation;
use crate::query::QueryBuilder;
use crate::registry::{Directive, InputValue, Registry};
use crate::types::QueryRoot;
use crate::{ObjectType, SubscribeBuilder, SubscriptionType, Type};
use std::any::Any;
use std::collections::HashMap;

/// GraphQL schema
pub struct Schema<Query, Mutation, Subscription> {
    query: QueryRoot<Query>,
    mutation: Mutation,
    pub(crate) subscription: Subscription,
    pub(crate) registry: Registry,
    pub(crate) data: Data,
}

impl<Query: ObjectType, Mutation: ObjectType, Subscription: SubscriptionType>
    Schema<Query, Mutation, Subscription>
{
    /// Create a schema
    ///
    /// The root object for the query and Mutation needs to be specified.
    /// If there is no mutation, you can use `EmptyMutation`.
    /// If there is no subscription, you can use `EmptySubscription`.
    pub fn new(query: Query, mutation: Mutation, subscription: Subscription) -> Self {
        let mut registry = Registry {
            types: Default::default(),
            directives: Default::default(),
            implements: Default::default(),
            query_type: Query::type_name().to_string(),
            mutation_type: if Mutation::is_empty() {
                None
            } else {
                Some(Mutation::type_name().to_string())
            },
            subscription_type: if Subscription::is_empty() {
                None
            } else {
                Some(Subscription::type_name().to_string())
            },
        };

        registry.add_directive(Directive {
            name: "include",
            description: Some("Directs the executor to include this field or fragment only when the `if` argument is true."),
            locations: vec![
                __DirectiveLocation::FIELD,
                __DirectiveLocation::FRAGMENT_SPREAD,
                __DirectiveLocation::INLINE_FRAGMENT
            ],
            args: {
                let mut args = HashMap::new();
                args.insert("if", InputValue {
                    name: "if",
                    description: Some("Included when true."),
                    ty: "Boolean!".to_string(),
                    default_value: None,
                    validator: None,
                });
                args
            }
        });

        registry.add_directive(Directive {
            name: "skip",
            description: Some("Directs the executor to skip this field or fragment when the `if` argument is true."),
            locations: vec![
                __DirectiveLocation::FIELD,
                __DirectiveLocation::FRAGMENT_SPREAD,
                __DirectiveLocation::INLINE_FRAGMENT
            ],
            args: {
                let mut args = HashMap::new();
                args.insert("if", InputValue {
                    name: "if",
                    description: Some("Skipped when true."),
                    ty: "Boolean!".to_string(),
                    default_value: None,
                    validator: None,
                });
                args
            }
        });

        // register scalars
        bool::create_type_info(&mut registry);
        i32::create_type_info(&mut registry);
        f32::create_type_info(&mut registry);
        String::create_type_info(&mut registry);

        QueryRoot::<Query>::create_type_info(&mut registry);
        if !Mutation::is_empty() {
            Mutation::create_type_info(&mut registry);
        }
        if !Subscription::is_empty() {
            Subscription::create_type_info(&mut registry);
        }

        Self {
            query: QueryRoot { inner: query },
            mutation,
            subscription,
            registry,
            data: Default::default(),
        }
    }

    /// Add a global data that can be accessed in the `Context`.
    pub fn data<D: Any + Send + Sync>(mut self, data: D) -> Self {
        self.data.insert(data);
        self
    }

    /// Start a query and return `QueryBuilder`.
    pub fn query<'a>(&'a self, source: &'a str) -> QueryBuilder<'a, Query, Mutation> {
        QueryBuilder {
            query: &self.query,
            mutation: &self.mutation,
            registry: &self.registry,
            source,
            operation_name: None,
            variables: None,
            data: &self.data,
        }
    }

    /// Start a subscribe and return `SubscribeBuilder`.
    pub fn subscribe<'a>(&'a self, source: &'a str) -> SubscribeBuilder<'a, Subscription> {
        SubscribeBuilder {
            subscription: &self.subscription,
            registry: &self.registry,
            source,
            operation_name: None,
            variables: None,
        }
    }
}