Trait async_graphql::CustomDirective
source · pub trait CustomDirective: Sync + Send + 'static {
fn resolve_field<'life0, 'life1, 'life2, 'life3, 'async_trait>(
&'life0 self,
ctx: &'life1 Context<'life2>,
resolve: ResolveFut<'life3>
) -> Pin<Box<dyn Future<Output = ServerResult<Option<Value>>> + Send + 'async_trait>>
where
Self: 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait,
'life2: 'async_trait,
'life3: 'async_trait,
{ ... }
}
Expand description
Represents a custom directive.
Provided Methods§
sourcefn resolve_field<'life0, 'life1, 'life2, 'life3, 'async_trait>(
&'life0 self,
ctx: &'life1 Context<'life2>,
resolve: ResolveFut<'life3>
) -> Pin<Box<dyn Future<Output = ServerResult<Option<Value>>> + Send + 'async_trait>>where
Self: 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait,
'life2: 'async_trait,
'life3: 'async_trait,
fn resolve_field<'life0, 'life1, 'life2, 'life3, 'async_trait>(
&'life0 self,
ctx: &'life1 Context<'life2>,
resolve: ResolveFut<'life3>
) -> Pin<Box<dyn Future<Output = ServerResult<Option<Value>>> + Send + 'async_trait>>where
Self: 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait,
'life2: 'async_trait,
'life3: 'async_trait,
Called at resolve field.
Examples found in repository?
src/resolver_utils/container.rs (line 282)
182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355
pub fn add_set<T: ContainerType + ?Sized>(
&mut self,
ctx: &ContextSelectionSet<'a>,
root: &'a T,
) -> ServerResult<()> {
for selection in &ctx.item.node.items {
match &selection.node {
Selection::Field(field) => {
if field.node.name.node == "__typename" {
// Get the typename
let ctx_field = ctx.with_field(field);
let field_name = ctx_field.item.node.response_key().node.clone();
let typename = root.introspection_type_name().into_owned();
self.0.push(Box::pin(async move {
Ok((field_name, Value::String(typename)))
}));
continue;
}
let resolve_fut = Box::pin({
let ctx = ctx.clone();
async move {
let ctx_field = ctx.with_field(field);
let field_name = ctx_field.item.node.response_key().node.clone();
let extensions = &ctx.query_env.extensions;
if extensions.is_empty() && field.node.directives.is_empty() {
Ok((
field_name,
root.resolve_field(&ctx_field).await?.unwrap_or_default(),
))
} else {
let type_name = T::type_name();
let resolve_info = ResolveInfo {
path_node: ctx_field.path_node.as_ref().unwrap(),
parent_type: &type_name,
return_type: match ctx_field
.schema_env
.registry
.types
.get(type_name.as_ref())
.and_then(|ty| {
ty.field_by_name(field.node.name.node.as_str())
})
.map(|field| &field.ty)
{
Some(ty) => &ty,
None => {
return Err(ServerError::new(
format!(
r#"Cannot query field "{}" on type "{}"."#,
field_name, type_name
),
Some(ctx_field.item.pos),
));
}
},
name: field.node.name.node.as_str(),
alias: field
.node
.alias
.as_ref()
.map(|alias| alias.node.as_str()),
is_for_introspection: ctx_field.is_for_introspection,
};
let resolve_fut = root.resolve_field(&ctx_field);
if field.node.directives.is_empty() {
futures_util::pin_mut!(resolve_fut);
Ok((
field_name,
extensions
.resolve(resolve_info, &mut resolve_fut)
.await?
.unwrap_or_default(),
))
} else {
let mut resolve_fut = resolve_fut.boxed();
for directive in &field.node.directives {
if let Some(directive_factory) = ctx
.schema_env
.custom_directives
.get(directive.node.name.node.as_str())
{
let ctx_directive = ContextBase {
path_node: ctx_field.path_node,
is_for_introspection: false,
item: directive,
schema_env: ctx_field.schema_env,
query_env: ctx_field.query_env,
};
let directive_instance = directive_factory
.create(&ctx_directive, &directive.node)?;
resolve_fut = Box::pin({
let ctx_field = ctx_field.clone();
async move {
directive_instance
.resolve_field(&ctx_field, &mut resolve_fut)
.await
}
});
}
}
Ok((
field_name,
extensions
.resolve(resolve_info, &mut resolve_fut)
.await?
.unwrap_or_default(),
))
}
}
}
});
self.0.push(resolve_fut);
}
selection => {
let (type_condition, selection_set) = match selection {
Selection::Field(_) => unreachable!(),
Selection::FragmentSpread(spread) => {
let fragment =
ctx.query_env.fragments.get(&spread.node.fragment_name.node);
let fragment = match fragment {
Some(fragment) => fragment,
None => {
return Err(ServerError::new(
format!(
r#"Unknown fragment "{}"."#,
spread.node.fragment_name.node
),
Some(spread.pos),
));
}
};
(
Some(&fragment.node.type_condition),
&fragment.node.selection_set,
)
}
Selection::InlineFragment(fragment) => (
fragment.node.type_condition.as_ref(),
&fragment.node.selection_set,
),
};
let type_condition =
type_condition.map(|condition| condition.node.on.node.as_str());
let introspection_type_name = root.introspection_type_name();
let applies_concrete_object = type_condition.map_or(false, |condition| {
introspection_type_name == condition
|| ctx
.schema_env
.registry
.implements
.get(&*introspection_type_name)
.map_or(false, |interfaces| interfaces.contains(condition))
});
if applies_concrete_object {
root.collect_all_fields(&ctx.with_selection_set(selection_set), self)?;
} else if type_condition.map_or(true, |condition| T::type_name() == condition) {
// The fragment applies to an interface type.
self.add_set(&ctx.with_selection_set(selection_set), root)?;
}
}
}
}
Ok(())
}