我正在尝试在我的 Rust 项目中使用 Actix-SQLx-Juniper。我遵循并结合了我找到的任何教程,它成功编译并运行。但是当我尝试发布查询时,我在终端中收到了这个错误:
thread 'actix-web' panicked at 'Tried to resolve async field users on type Some("Query") with a sync resolver', src/graphql.rs:15:1
我的 GraphiQL 显示"Thread pool is gone"
这是src/graphql.rs
:
#[derive(Clone, Debug)]
pub struct Context {
pub pool: PgPool,
}
impl juniper::Context for Context {}
pub struct Query;
#[graphql_object(Context = Context)] // this is line 15
impl Query {
fn apiVersion() -> &str {
"1.0"
}
#[graphql(description = "Hello")]
pub async fn users(ctx: &Context) -> FieldResult<Vec<User>> {
println!("{:#?}", ctx);
sqlx::query_as::<_, User>("SELECT * FROM users")
.fetch_all(&ctx.pool)
.await
.map_err(|e| e.into())
}
}
pub type Schema = RootNode<'static, Query, EmptyMutation<Context>, EmptySubscription<Context>>;
pub fn create_schema() -> Schema {
Schema::new(Query {}, EmptyMutation::new(), EmptySubscription::new())
}
但是在我跟踪错误之后,当我尝试execute_sync
在我的src/handler.rs
:
pub fn graphql_handlers(config: &mut ServiceConfig) {
config
.data(create_schema())
.route("/graphql", web::get().to(graphql_playground))
.route("/graphql", web::post().to(graphql));
}
...
...
async fn graphql(
pool: web::Data<PgPool>,
schema: web::Data<Schema>,
data: web::Json<GraphQLRequest>,
) -> Result<HttpResponse, Error> {
let ctx = Context {
pool: pool.get_ref().to_owned(),
};
let res = block(move || {
let res = data.execute_sync(&schema, &ctx);
Ok::<_, serde_json::error::Error>(serde_json::to_string(&res)?)
})
.await
.map_err(Error::from)?;
Ok(HttpResponse::Ok()
.content_type("application/json")
.body(res))
}
我试图找到解决方案或样板代码,但仍然找不到。
这是我的main.rs
:
#[actix_web::main]
async fn main() -> Result<()> {
let pool = create_pool().await.expect("Failed connecting to postgres");
HttpServer::new(move || {
App::new()
.data(pool.clone())
.wrap(Logger::default())
.configure(graphql_handlers)
})
.bind("127.0.0.1:8000")?
.run()
.await
}
这是我的依赖项:
actix-web = "3"
juniper = "0.15"
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0.64"
uuid = { version = "0.8", features = [ "serde", "v4"] }
sqlx = { version = "0.4", features = [ "runtime-actix-rustls", "postgres", "uuid" ] }