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

use finchers::endpoint;
use finchers::endpoint::wrapper::Wrapper;
use finchers::endpoint::{ApplyContext, ApplyResult, Endpoint, IntoEndpoint};
use finchers::error::Error;

use futures::future;
use futures::{Future, Poll};

use juniper::{GraphQLType, RootNode};
use std::fmt;

use super::Schema;
use request::{GraphQLRequestEndpoint, GraphQLResponse, RequestFuture};

/// Create a GraphQL executor from the specified `RootNode`.
///
/// The endpoint created by this executor will execute the GraphQL queries
/// on the current thread.
pub fn current_thread<S>(schema: S) -> CurrentThread<S>
where
    S: Schema,
{
    CurrentThread { schema }
}

#[allow(missing_docs)]
#[derive(Debug)]
pub struct CurrentThread<S> {
    schema: S,
}

impl<'a, S> IntoEndpoint<'a> for CurrentThread<S>
where
    S: Schema<Context = ()> + 'a,
{
    type Output = (GraphQLResponse,);
    type Endpoint = CurrentThreadEndpoint<endpoint::Cloned<()>, S>;

    fn into_endpoint(self) -> Self::Endpoint {
        CurrentThreadEndpoint {
            context: endpoint::cloned(()),
            request: ::request::graphql_request(),
            schema: self.schema,
        }
    }
}

impl<'a, E, CtxT, S> Wrapper<'a, E> for CurrentThread<S>
where
    E: Endpoint<'a, Output = (CtxT,)>,
    S: Schema<Context = CtxT> + 'a,
    CtxT: 'a,
{
    type Output = (GraphQLResponse,);
    type Endpoint = CurrentThreadEndpoint<E, S>;

    fn wrap(self, endpoint: E) -> Self::Endpoint {
        CurrentThreadEndpoint {
            context: endpoint,
            request: ::request::graphql_request(),
            schema: self.schema,
        }
    }
}

#[derive(Debug)]
pub struct CurrentThreadEndpoint<E, S> {
    context: E,
    request: GraphQLRequestEndpoint,
    schema: S,
}

impl<'a, E, S, CtxT> Endpoint<'a> for CurrentThreadEndpoint<E, S>
where
    E: Endpoint<'a, Output = (CtxT,)>,
    S: Schema<Context = CtxT> + 'a,
    CtxT: 'a,
{
    type Output = (GraphQLResponse,);
    type Future = CurrentThreadFuture<'a, E, S::Query, S::Mutation, CtxT>;

    fn apply(&'a self, cx: &mut ApplyContext<'_>) -> ApplyResult<Self::Future> {
        let context = self.context.apply(cx)?;
        let request = self.request.apply(cx)?;
        Ok(CurrentThreadFuture {
            inner: context.join(request),
            root_node: self.schema.as_root_node(),
        })
    }
}

pub struct CurrentThreadFuture<'a, E, QueryT, MutationT, CtxT>
where
    E: Endpoint<'a, Output = (CtxT,)>,
    QueryT: GraphQLType<Context = CtxT> + 'a,
    MutationT: GraphQLType<Context = CtxT> + 'a,
    CtxT: 'a,
{
    inner: future::Join<E::Future, RequestFuture<'a>>,
    root_node: &'a RootNode<'static, QueryT, MutationT>,
}

impl<'a, E, QueryT, MutationT, CtxT> fmt::Debug
    for CurrentThreadFuture<'a, E, QueryT, MutationT, CtxT>
where
    E: Endpoint<'a, Output = (CtxT,)>,
    QueryT: GraphQLType<Context = CtxT> + 'a,
    MutationT: GraphQLType<Context = CtxT> + 'a,
    CtxT: 'a,
{
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("CurrentThreadFuture").finish()
    }
}

impl<'a, E, QueryT, MutationT, CtxT> Future for CurrentThreadFuture<'a, E, QueryT, MutationT, CtxT>
where
    E: Endpoint<'a, Output = (CtxT,)>,
    QueryT: GraphQLType<Context = CtxT>,
    MutationT: GraphQLType<Context = CtxT>,
    CtxT: 'a,
{
    type Item = (GraphQLResponse,);
    type Error = Error;

    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
        let ((context,), (request,)) = try_ready!(self.inner.poll());
        let response = request.execute(self.root_node, &context);
        Ok((response,).into())
    }
}