lenso_kernel/
request.rs

1use std::time::Duration;
2
3use super::{
4    CancellationToken, EventCapability, InvocationContext, LocalBoxFuture, NativeAppRuntime,
5    NativeEndpointBinding, NativeEventHandle, NativeRequestEndpoint, NativeRequestHandle,
6    NativeStreamEndpointBinding, NativeStreamHandle, PluginEventDependencyHandle, Rc, RefCell,
7    StreamCapability, Weak,
8};
9
10pub trait RequestCapability: 'static {
11    /// Typed request value.
12    type Request: 'static;
13    /// Typed success value.
14    type Response: 'static;
15    /// Typed Capability-defined error value.
16    type DomainError: 'static;
17    /// Stable Capability series identity.
18    const ID: &'static str;
19    /// Exact generated Descriptor version.
20    const DESCRIPTOR_VERSION: &'static str;
21
22    /// Invokes one native endpoint using the most specific binding available.
23    ///
24    /// Generated bindings override this hook with a typed path. Older bindings retain the
25    /// type-erased compatibility path without requiring regeneration.
26    #[doc(hidden)]
27    fn invoke_native(
28        endpoint: &dyn NativeRequestEndpoint,
29        operation: &str,
30        request: Self::Request,
31        context: InvocationContext,
32    ) -> NativeRequestFuture<Self>
33    where
34        Self: Sized,
35    {
36        invoke_typed_or_erased_native_request::<Self>(endpoint, operation, request, context)
37    }
38}
39
40/// A typed native request result before Kernel cancellation and supervision are applied.
41#[doc(hidden)]
42pub type NativeRequestFuture<C> = LocalBoxFuture<
43    'static,
44    Result<
45        Result<<C as RequestCapability>::Response, <C as RequestCapability>::DomainError>,
46        RuntimeFailure,
47    >,
48>;
49
50type TypedNativeRequestFn<C> =
51    dyn Fn(&str, <C as RequestCapability>::Request, InvocationContext) -> NativeRequestFuture<C>;
52
53/// Runtime-provided typed endpoint used when a request crosses an execution boundary.
54///
55/// Generated in-process endpoints may expose a more specific endpoint type. This generic
56/// carrier lets execution adapters preserve typed request, response, and domain-error values
57/// without routing them through `Box<dyn Any>`.
58#[doc(hidden)]
59pub struct TypedNativeRequestEndpoint<C: RequestCapability> {
60    invoke: Rc<TypedNativeRequestFn<C>>,
61}
62
63impl<C: RequestCapability> TypedNativeRequestEndpoint<C> {
64    /// Creates a typed endpoint around one runtime-owned dispatcher.
65    pub fn new(
66        invoke: impl Fn(&str, C::Request, InvocationContext) -> NativeRequestFuture<C> + 'static,
67    ) -> Self {
68        Self {
69            invoke: Rc::new(invoke),
70        }
71    }
72
73    /// Dispatches one request without type erasure.
74    pub fn invoke(
75        &self,
76        operation: &str,
77        request: C::Request,
78        context: InvocationContext,
79    ) -> NativeRequestFuture<C> {
80        (self.invoke)(operation, request, context)
81    }
82}
83
84impl<C: RequestCapability> std::fmt::Debug for TypedNativeRequestEndpoint<C> {
85    fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
86        formatter
87            .debug_struct("TypedNativeRequestEndpoint")
88            .field("capability", &C::ID)
89            .finish_non_exhaustive()
90    }
91}
92
93/// Uses a runtime-provided typed endpoint when present, retaining erased compatibility.
94#[doc(hidden)]
95pub fn invoke_typed_or_erased_native_request<C: RequestCapability>(
96    endpoint: &dyn NativeRequestEndpoint,
97    operation: &str,
98    request: C::Request,
99    context: InvocationContext,
100) -> NativeRequestFuture<C> {
101    if let Some(endpoint) = endpoint
102        .typed_endpoint()
103        .and_then(|endpoint| endpoint.downcast_ref::<TypedNativeRequestEndpoint<C>>())
104    {
105        endpoint.invoke(operation, request, context)
106    } else {
107        invoke_erased_native_request::<C>(endpoint, operation, request, context)
108    }
109}
110
111/// Compatibility dispatcher used by generated bindings when a typed endpoint is unavailable.
112#[doc(hidden)]
113pub fn invoke_erased_native_request<C: RequestCapability>(
114    endpoint: &dyn NativeRequestEndpoint,
115    operation: &str,
116    request: C::Request,
117    context: InvocationContext,
118) -> NativeRequestFuture<C> {
119    let invocation = endpoint.invoke(operation, Box::new(request), context);
120    Box::pin(async move {
121        match invocation.await? {
122            Ok(value) => value
123                .downcast::<C::Response>()
124                .map(|value| Ok(*value))
125                .map_err(|_| RuntimeFailure::ProtocolViolation { capability: C::ID }),
126            Err(value) => value
127                .downcast::<C::DomainError>()
128                .map(|value| Err(*value))
129                .map_err(|_| RuntimeFailure::ProtocolViolation { capability: C::ID }),
130        }
131    })
132}
133
134/// Kernel-generated identity for one logical request invocation.
135pub type RequestId = u64;
136
137/// Runtime-owned failure, kept separate from Capability-defined Domain Errors.
138#[derive(Clone, Debug, Eq, PartialEq)]
139pub enum RuntimeFailure {
140    /// The consumer has no resolved binding for this Capability.
141    Unavailable { capability: &'static str },
142    /// The bound provider does not declare the requested Operation.
143    UnknownOperation {
144        capability: &'static str,
145        operation: String,
146    },
147    /// A singular generated client was used for a requirement with many providers.
148    AmbiguousBinding {
149        capability: &'static str,
150        providers: usize,
151    },
152    /// Generated native types disagreed with the prepared endpoint.
153    ProtocolViolation { capability: &'static str },
154    /// A package selected by the Plan was not linked into the native App.
155    MissingPluginFactory {
156        instance: String,
157        package_id: String,
158    },
159    /// No installed Execution Adapter provides the class selected by one Instance.
160    UnavailableExecutionClass {
161        instance_key: String,
162        execution_class: String,
163    },
164    /// The Resolved Plan or prepared endpoint set is internally inconsistent.
165    InvalidResolvedPlan { detail: String },
166    /// New request admission was closed because the App is shutting down.
167    AdmissionClosed,
168    /// The request could not enter a full bounded admission queue.
169    ResourceExhausted {
170        capability: &'static str,
171        operation: String,
172    },
173    /// The invocation deadline expired before the request completed.
174    DeadlineExceeded { request_id: RequestId },
175    /// The caller cancelled the invocation before it completed.
176    Cancelled { request_id: RequestId },
177    /// The Runtime Driver or Adapter reported an internal execution failure.
178    Internal { detail: String },
179    /// A Plugin generation reported a failure that should trigger supervision.
180    PluginFailure { detail: String },
181    /// A Plugin Instance exhausted its finite restart budget.
182    PluginRestartExhausted { instance: String, attempts: usize },
183}
184
185/// The lifecycle phase represented by a Plugin context.
186#[derive(Clone, Copy, Debug, Eq, PartialEq)]
187pub enum PluginLifecyclePhase {
188    /// The Plugin may validate configuration and reserve reversible resources.
189    Prepare,
190    /// Adapter lowering constructs the complete inert Plugin object.
191    Construct,
192    /// The Plugin may initialize against already prepared dependencies.
193    Activate,
194    /// The App Ready Gate has opened and externally triggered work may begin.
195    Ready,
196    /// The Plugin must release work and resources owned by this generation.
197    Deactivate,
198}
199
200#[cfg(test)]
201mod typed_endpoint_tests {
202    use std::any::Any;
203
204    use super::*;
205
206    #[derive(Debug)]
207    struct Echo;
208
209    impl RequestCapability for Echo {
210        type Request = u64;
211        type Response = u64;
212        type DomainError = ();
213        const ID: &'static str = "test.echo@1";
214        const DESCRIPTOR_VERSION: &'static str = "1.0.0";
215    }
216
217    #[derive(Debug)]
218    struct Endpoint {
219        typed: TypedNativeRequestEndpoint<Echo>,
220    }
221
222    impl NativeRequestEndpoint for Endpoint {
223        fn capability_id(&self) -> &'static str {
224            Echo::ID
225        }
226
227        fn descriptor_version(&self) -> &'static str {
228            Echo::DESCRIPTOR_VERSION
229        }
230
231        fn operations(&self) -> &'static [&'static str] {
232            &["echo"]
233        }
234
235        fn typed_endpoint(&self) -> Option<&dyn Any> {
236            Some(&self.typed)
237        }
238
239        fn invoke(
240            &self,
241            _operation: &str,
242            _request: Box<dyn Any>,
243            _context: InvocationContext,
244        ) -> LocalBoxFuture<'static, Result<crate::ErasedDomainResult, RuntimeFailure>> {
245            panic!("typed dispatch must not call the erased endpoint")
246        }
247    }
248
249    #[test]
250    fn default_dispatch_uses_runtime_typed_endpoint() {
251        let endpoint = Endpoint {
252            typed: TypedNativeRequestEndpoint::new(|_, request, _| {
253                Box::pin(futures::future::ready(Ok(Ok(request + 1))))
254            }),
255        };
256        let context = InvocationContext::new(1, None, CancellationToken::new());
257
258        let result =
259            futures::executor::block_on(Echo::invoke_native(&endpoint, "echo", 41, context));
260
261        assert_eq!(result, Ok(Ok(42)));
262    }
263}
264
265/// A deterministic dependency visible to one Plugin Instance.
266#[derive(Clone, Debug)]
267pub struct PluginDependency {
268    pub(super) requirement_id: String,
269    pub(super) capability_id: String,
270    pub(super) provider_instance: String,
271    pub(super) provider_order: usize,
272    pub(super) handle: Option<PluginDependencyHandle>,
273    pub(super) stream_handle: Option<PluginStreamDependencyHandle>,
274    pub(super) event_handle: Option<PluginEventDependencyHandle>,
275}
276
277impl PluginDependency {
278    pub(super) fn new(
279        requirement_id: impl Into<String>,
280        capability_id: impl Into<String>,
281        provider_instance: impl Into<String>,
282        provider_order: usize,
283        handle: Option<PluginDependencyHandle>,
284        stream_handle: Option<PluginStreamDependencyHandle>,
285        event_handle: Option<PluginEventDependencyHandle>,
286    ) -> Self {
287        Self {
288            requirement_id: requirement_id.into(),
289            capability_id: capability_id.into(),
290            provider_instance: provider_instance.into(),
291            provider_order,
292            handle,
293            stream_handle,
294            event_handle,
295        }
296    }
297
298    /// Returns the Capability required by this dependency.
299    pub fn requirement_id(&self) -> &str {
300        &self.requirement_id
301    }
302
303    /// Returns the Capability required by this dependency.
304    pub fn capability_id(&self) -> &str {
305        &self.capability_id
306    }
307
308    /// Returns the App-local provider Instance key.
309    pub fn provider_instance(&self) -> &str {
310        &self.provider_instance
311    }
312
313    /// Returns the deterministic provider order for a `many` binding.
314    pub const fn provider_order(&self) -> usize {
315        self.provider_order
316    }
317
318    /// Returns the resolved native endpoint handle when the Adapter supplied one.
319    pub fn handle(&self) -> Option<PluginDependencyHandle> {
320        self.handle.clone()
321    }
322
323    /// Returns the resolved native stream endpoint handle when the Adapter supplied one.
324    pub fn stream_handle(&self) -> Option<PluginStreamDependencyHandle> {
325        self.stream_handle.clone()
326    }
327
328    /// Returns the resolved native Event endpoint handle when the Adapter supplied one.
329    pub fn event_handle(&self) -> Option<PluginEventDependencyHandle> {
330        self.event_handle.clone()
331    }
332}
333
334/// An opaque, Adapter-resolved Capability endpoint passed to lifecycle code.
335#[derive(Clone, Debug)]
336pub struct PluginDependencyHandle {
337    pub(super) binding: NativeEndpointBinding,
338    pub(super) caller_instance: String,
339    pub(super) runtime: Rc<RefCell<Weak<NativeAppRuntime>>>,
340}
341
342/// An opaque, Adapter-resolved stream Capability endpoint passed to lifecycle code.
343#[derive(Clone, Debug)]
344pub struct PluginStreamDependencyHandle {
345    pub(super) binding: NativeStreamEndpointBinding,
346    pub(super) caller_instance: String,
347    pub(super) runtime: Rc<RefCell<Weak<NativeAppRuntime>>>,
348}
349
350impl PluginStreamDependencyHandle {
351    /// Returns the Capability implemented by this stream handle.
352    pub fn capability_id(&self) -> &'static str {
353        self.binding.state.capability_id
354    }
355
356    /// Returns the exact Descriptor version implemented by this stream handle.
357    pub fn descriptor_version(&self) -> &'static str {
358        self.binding.state.descriptor_version
359    }
360
361    /// Returns the exact stream Operation table implemented by this handle.
362    pub fn operations(&self) -> &'static [&'static str] {
363        self.binding.state.operations
364    }
365
366    /// Converts this resolved dependency into its generated typed stream handle.
367    pub fn typed<C: StreamCapability>(&self) -> Result<NativeStreamHandle<C>, RuntimeFailure> {
368        if self.capability_id() != C::ID || self.descriptor_version() != C::DESCRIPTOR_VERSION {
369            return Err(RuntimeFailure::ProtocolViolation { capability: C::ID });
370        }
371        let runtime = self
372            .runtime
373            .borrow()
374            .upgrade()
375            .ok_or(RuntimeFailure::AdmissionClosed)?;
376        Ok(NativeStreamHandle::from_endpoints(
377            std::slice::from_ref(&self.binding),
378            runtime,
379            &self.caller_instance,
380            true,
381        ))
382    }
383}
384
385impl PluginDependencyHandle {
386    /// Returns the Capability implemented by this handle.
387    pub fn capability_id(&self) -> &'static str {
388        self.binding.state.capability_id
389    }
390
391    /// Returns the exact Descriptor version implemented by this handle.
392    pub fn descriptor_version(&self) -> &'static str {
393        self.binding.state.descriptor_version
394    }
395
396    /// Returns the exact Operation table implemented by this handle.
397    pub fn operations(&self) -> &'static [&'static str] {
398        self.binding.state.operations
399    }
400
401    /// Converts this resolved dependency into its generated typed request handle.
402    pub fn typed<C: RequestCapability>(&self) -> Result<NativeRequestHandle<C>, RuntimeFailure> {
403        if self.capability_id() != C::ID || self.descriptor_version() != C::DESCRIPTOR_VERSION {
404            return Err(RuntimeFailure::ProtocolViolation { capability: C::ID });
405        }
406        let runtime = self
407            .runtime
408            .borrow()
409            .upgrade()
410            .ok_or(RuntimeFailure::AdmissionClosed)?;
411        Ok(NativeRequestHandle::from_endpoints(
412            std::slice::from_ref(&self.binding),
413            runtime,
414            &self.caller_instance,
415            true,
416        ))
417    }
418}
419
420/// The explicit Capability dependencies available during Plugin lifecycle.
421#[derive(Clone, Debug, Default)]
422pub struct PluginDependencies {
423    pub(super) requirements: Vec<lenso_app_plan::CapabilityRequirementPlan>,
424    pub(super) bindings: Vec<PluginDependency>,
425    pub(super) caller_instance: Rc<str>,
426    pub(super) runtime: Rc<RefCell<Weak<NativeAppRuntime>>>,
427}
428
429impl PluginDependencies {
430    pub(super) fn new(
431        caller_instance: impl Into<String>,
432        runtime: Rc<RefCell<Weak<NativeAppRuntime>>>,
433        requirements: Vec<lenso_app_plan::CapabilityRequirementPlan>,
434    ) -> Self {
435        Self {
436            requirements,
437            bindings: Vec::new(),
438            caller_instance: Rc::from(caller_instance.into()),
439            runtime,
440        }
441    }
442
443    /// Returns dependencies in the order materialized by the Resolved App Plan.
444    pub fn requirements(&self) -> &[lenso_app_plan::CapabilityRequirementPlan] {
445        &self.requirements
446    }
447
448    /// Narrows this view to one declared dependency, retaining optional absence.
449    pub fn requirement(&self, id: &str) -> Result<Self, RuntimeFailure> {
450        let requirement = self
451            .requirements
452            .iter()
453            .find(|requirement| requirement.requirement_id() == id)
454            .ok_or_else(|| RuntimeFailure::InvalidResolvedPlan {
455                detail: format!(
456                    "consumer `{}` has no requirement `{id}`",
457                    self.caller_instance
458                ),
459            })?;
460        Ok(Self {
461            requirements: vec![requirement.clone()],
462            bindings: self
463                .bindings
464                .iter()
465                .filter(|binding| binding.requirement_id() == id)
466                .cloned()
467                .collect(),
468            caller_instance: self.caller_instance.clone(),
469            runtime: self.runtime.clone(),
470        })
471    }
472
473    fn validate_lookup(
474        &self,
475        capability: &'static str,
476        version: &str,
477    ) -> Result<(), RuntimeFailure> {
478        let declarations = self
479            .requirements
480            .iter()
481            .filter(|requirement| requirement.capability_id() == capability)
482            .collect::<Vec<_>>();
483        match declarations.as_slice() {
484            [] => Err(RuntimeFailure::Unavailable { capability }),
485            [declaration] if declaration.descriptor_version() == version => Ok(()),
486            [_] => Err(RuntimeFailure::ProtocolViolation { capability }),
487            declarations => Err(RuntimeFailure::AmbiguousBinding {
488                capability,
489                providers: declarations.len(),
490            }),
491        }
492    }
493
494    /// Returns dependencies in the order materialized by the Resolved App Plan.
495    pub fn bindings(&self) -> &[PluginDependency] {
496        &self.bindings
497    }
498
499    /// Returns the number of explicit dependencies.
500    pub fn len(&self) -> usize {
501        self.bindings.len()
502    }
503
504    /// Returns whether this Plugin has no explicit dependencies.
505    pub fn is_empty(&self) -> bool {
506        self.bindings.is_empty()
507    }
508
509    /// Creates a Kernel Invocation Context for work initiated by this Plugin.
510    ///
511    /// The request identity and monotonic deadline come from the same Runtime
512    /// Driver as the App. The context is still owned by the caller and its
513    /// cancellation token remains explicit.
514    pub fn invocation_context(
515        &self,
516        deadline: Option<Duration>,
517        cancellation: CancellationToken,
518    ) -> Result<InvocationContext, RuntimeFailure> {
519        let runtime = self
520            .runtime
521            .borrow()
522            .upgrade()
523            .ok_or(RuntimeFailure::AdmissionClosed)?;
524        let request_id = runtime.request_ids.get();
525        runtime.request_ids.set(request_id.saturating_add(1));
526        Ok(InvocationContext::new(request_id, deadline, cancellation)
527            .with_shared_caller_instance(self.caller_instance.clone()))
528    }
529
530    /// Creates a Plugin Invocation Context with a Driver-relative deadline.
531    pub fn invocation_context_after(
532        &self,
533        timeout: Duration,
534        cancellation: CancellationToken,
535    ) -> Result<InvocationContext, RuntimeFailure> {
536        let runtime = self
537            .runtime
538            .borrow()
539            .upgrade()
540            .ok_or(RuntimeFailure::AdmissionClosed)?;
541        let deadline = (runtime.driver.now)().saturating_add(timeout);
542        drop(runtime);
543        self.invocation_context(Some(deadline), cancellation)
544    }
545
546    /// Returns the one explicitly bound typed dependency.
547    pub fn one<C: RequestCapability>(&self) -> Result<NativeRequestHandle<C>, RuntimeFailure> {
548        self.validate_lookup(C::ID, C::DESCRIPTOR_VERSION)?;
549        let handles: Vec<_> = self
550            .bindings
551            .iter()
552            .filter(|binding| binding.capability_id() == C::ID)
553            .filter_map(PluginDependency::handle)
554            .collect();
555        match handles.as_slice() {
556            [handle] => handle.typed::<C>(),
557            [] => Err(RuntimeFailure::Unavailable { capability: C::ID }),
558            handles => Err(RuntimeFailure::AmbiguousBinding {
559                capability: C::ID,
560                providers: handles.len(),
561            }),
562        }
563    }
564
565    /// Returns an optional explicitly bound typed dependency.
566    pub fn optional<C: RequestCapability>(
567        &self,
568    ) -> Result<Option<NativeRequestHandle<C>>, RuntimeFailure> {
569        self.validate_lookup(C::ID, C::DESCRIPTOR_VERSION)?;
570        match self
571            .bindings
572            .iter()
573            .filter(|binding| binding.capability_id() == C::ID)
574            .filter_map(PluginDependency::handle)
575            .collect::<Vec<_>>()
576            .as_slice()
577        {
578            [] => Ok(None),
579            [handle] => handle.typed::<C>().map(Some),
580            handles => Err(RuntimeFailure::AmbiguousBinding {
581                capability: C::ID,
582                providers: handles.len(),
583            }),
584        }
585    }
586
587    /// Returns all explicitly bound typed dependencies in resolved provider order.
588    pub fn many<C: RequestCapability>(
589        &self,
590    ) -> Result<Vec<NativeRequestHandle<C>>, RuntimeFailure> {
591        self.validate_lookup(C::ID, C::DESCRIPTOR_VERSION)?;
592        self.bindings
593            .iter()
594            .filter(|binding| binding.capability_id() == C::ID)
595            .filter_map(PluginDependency::handle)
596            .map(|handle| handle.typed::<C>())
597            .collect()
598    }
599
600    /// Returns the one explicitly bound typed stream dependency.
601    pub fn one_stream<C: StreamCapability>(&self) -> Result<NativeStreamHandle<C>, RuntimeFailure> {
602        self.validate_lookup(C::ID, C::DESCRIPTOR_VERSION)?;
603        let handles: Vec<_> = self
604            .bindings
605            .iter()
606            .filter(|binding| binding.capability_id() == C::ID)
607            .filter_map(PluginDependency::stream_handle)
608            .collect();
609        match handles.as_slice() {
610            [handle] => handle.typed::<C>(),
611            [] => Err(RuntimeFailure::Unavailable { capability: C::ID }),
612            handles => Err(RuntimeFailure::AmbiguousBinding {
613                capability: C::ID,
614                providers: handles.len(),
615            }),
616        }
617    }
618
619    /// Returns an optional explicitly bound typed stream dependency.
620    pub fn optional_stream<C: StreamCapability>(
621        &self,
622    ) -> Result<Option<NativeStreamHandle<C>>, RuntimeFailure> {
623        self.validate_lookup(C::ID, C::DESCRIPTOR_VERSION)?;
624        match self
625            .bindings
626            .iter()
627            .filter(|binding| binding.capability_id() == C::ID)
628            .filter_map(PluginDependency::stream_handle)
629            .collect::<Vec<_>>()
630            .as_slice()
631        {
632            [] => Ok(None),
633            [handle] => handle.typed::<C>().map(Some),
634            handles => Err(RuntimeFailure::AmbiguousBinding {
635                capability: C::ID,
636                providers: handles.len(),
637            }),
638        }
639    }
640
641    /// Returns all explicitly bound typed stream dependencies in Plan order.
642    pub fn many_stream<C: StreamCapability>(
643        &self,
644    ) -> Result<Vec<NativeStreamHandle<C>>, RuntimeFailure> {
645        self.validate_lookup(C::ID, C::DESCRIPTOR_VERSION)?;
646        self.bindings
647            .iter()
648            .filter(|binding| binding.capability_id() == C::ID)
649            .filter_map(PluginDependency::stream_handle)
650            .map(|handle| handle.typed::<C>())
651            .collect()
652    }
653
654    /// Returns one typed Event handle over every explicit binding in Plan order.
655    pub fn many_event<C: EventCapability>(&self) -> Result<NativeEventHandle<C>, RuntimeFailure> {
656        self.validate_lookup(C::ID, C::DESCRIPTOR_VERSION)?;
657        let handles: Vec<_> = self
658            .bindings
659            .iter()
660            .filter(|binding| binding.capability_id() == C::ID)
661            .filter_map(PluginDependency::event_handle)
662            .collect();
663        if handles.iter().any(|handle| {
664            handle.capability_id() != C::ID || handle.descriptor_version() != C::DESCRIPTOR_VERSION
665        }) {
666            return Err(RuntimeFailure::ProtocolViolation { capability: C::ID });
667        }
668        let runtime = self
669            .runtime
670            .borrow()
671            .upgrade()
672            .ok_or(RuntimeFailure::AdmissionClosed)?;
673        let endpoints = handles
674            .iter()
675            .map(|handle| handle.binding.clone())
676            .collect::<Vec<_>>();
677        Ok(NativeEventHandle::from_endpoints(
678            &endpoints,
679            runtime,
680            &self.caller_instance,
681            true,
682        ))
683    }
684
685    /// Returns the one explicitly bound typed Event dependency.
686    pub fn one_event<C: EventCapability>(&self) -> Result<NativeEventHandle<C>, RuntimeFailure> {
687        self.validate_lookup(C::ID, C::DESCRIPTOR_VERSION)?;
688        match self
689            .bindings
690            .iter()
691            .filter(|binding| binding.capability_id() == C::ID)
692            .filter_map(PluginDependency::event_handle)
693            .collect::<Vec<_>>()
694            .as_slice()
695        {
696            [handle] => handle.typed::<C>(),
697            [] => Err(RuntimeFailure::Unavailable { capability: C::ID }),
698            handles => Err(RuntimeFailure::AmbiguousBinding {
699                capability: C::ID,
700                providers: handles.len(),
701            }),
702        }
703    }
704
705    /// Returns an optional explicitly bound typed Event dependency.
706    pub fn optional_event<C: EventCapability>(
707        &self,
708    ) -> Result<Option<NativeEventHandle<C>>, RuntimeFailure> {
709        self.validate_lookup(C::ID, C::DESCRIPTOR_VERSION)?;
710        match self
711            .bindings
712            .iter()
713            .filter(|binding| binding.capability_id() == C::ID)
714            .filter_map(PluginDependency::event_handle)
715            .collect::<Vec<_>>()
716            .as_slice()
717        {
718            [] => Ok(None),
719            [handle] => handle.typed::<C>().map(Some),
720            handles => Err(RuntimeFailure::AmbiguousBinding {
721                capability: C::ID,
722                providers: handles.len(),
723            }),
724        }
725    }
726}
lenso_kernel/request.rs

lenso_kernel/
request.rs
