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| 1 | +use std::io::{Cursor, Read}; |
| 2 | + |
| 3 | +use serde_json; |
| 4 | + |
| 5 | +use rocket::Request; |
| 6 | +use rocket::data::{FromData, Outcome}; |
| 7 | +use rocket::response::{Responder, Response, content}; |
| 8 | +use rocket::http::{ContentType, Status}; |
| 9 | +use rocket::Data; |
| 10 | +use rocket::Outcome::{Forward, Failure, Success}; |
| 11 | + |
| 12 | +use ::http; |
| 13 | + |
| 14 | +use types::base::GraphQLType; |
| 15 | +use schema::model::RootNode; |
| 16 | + |
| 17 | +pub struct GraphQLResponse(Status, String); |
| 18 | +pub struct GraphQLRequest(http::GraphQLRequest); |
| 19 | + |
| 20 | +pub fn graphiql_source(graphql_endpoint_url: &str) -> content::HTML<String> { |
| 21 | + content::HTML(::graphiql::graphiql_source(graphql_endpoint_url)) |
| 22 | +} |
| 23 | + |
| 24 | +impl GraphQLRequest { |
| 25 | + pub fn execute<CtxT, QueryT, MutationT>( |
| 26 | + &self, |
| 27 | + root_node: &RootNode<QueryT, MutationT>, |
| 28 | + context: &CtxT, |
| 29 | + ) |
| 30 | + -> GraphQLResponse |
| 31 | + where QueryT: GraphQLType<Context=CtxT>, |
| 32 | + MutationT: GraphQLType<Context=CtxT>, |
| 33 | + { |
| 34 | + let response = self.0.execute(root_node, context); |
| 35 | + let status = if response.is_ok() { Status::Ok } else { Status::BadRequest }; |
| 36 | + let json = serde_json::to_string_pretty(&response).unwrap(); |
| 37 | + |
| 38 | + GraphQLResponse(status, json) |
| 39 | + } |
| 40 | +} |
| 41 | + |
| 42 | +impl FromData for GraphQLRequest { |
| 43 | + type Error = String; |
| 44 | + |
| 45 | + fn from_data(request: &Request, data: Data) -> Outcome<Self, String> { |
| 46 | + if !request.content_type().map_or(false, |ct| ct.is_json()) { |
| 47 | + return Forward(data); |
| 48 | + } |
| 49 | + |
| 50 | + let mut body = String::new(); |
| 51 | + if let Err(e) = data.open().read_to_string(&mut body) { |
| 52 | + return Failure((Status::InternalServerError, format!("{:?}", e))); |
| 53 | + } |
| 54 | + |
| 55 | + match serde_json::from_str(&body) { |
| 56 | + Ok(value) => Success(GraphQLRequest(value)), |
| 57 | + Err(failure) => return Failure( |
| 58 | + (Status::BadRequest, format!("{}", failure)), |
| 59 | + ), |
| 60 | + } |
| 61 | + } |
| 62 | +} |
| 63 | + |
| 64 | +impl<'r> Responder<'r> for GraphQLResponse { |
| 65 | + fn respond(self) -> Result<Response<'r>, Status> { |
| 66 | + let GraphQLResponse(status, body) = self; |
| 67 | + |
| 68 | + Ok(Response::build() |
| 69 | + .header(ContentType::new("application", "json")) |
| 70 | + .status(status) |
| 71 | + .sized_body(Cursor::new(body)) |
| 72 | + .finalize()) |
| 73 | + } |
| 74 | +} |
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