lenso_kernel/
request.rs

1use std::{any::Any, 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    /// Derives a uniquely identified child context whose cancellation observes
367    /// its parent without allowing the child Stream to cancel that parent.
368    pub fn child_context(
369        &self,
370        context: InvocationContext,
371    ) -> Result<InvocationContext, RuntimeFailure> {
372        let runtime = self
373            .runtime
374            .borrow()
375            .upgrade()
376            .ok_or(RuntimeFailure::AdmissionClosed)?;
377        let request_id = runtime.request_ids.get();
378        runtime.request_ids.set(request_id.saturating_add(1));
379        Ok(context.for_child_request(request_id))
380    }
381
382    /// Converts this resolved dependency into its generated typed stream handle.
383    pub fn typed<C: StreamCapability>(&self) -> Result<NativeStreamHandle<C>, RuntimeFailure> {
384        if self.capability_id() != C::ID || self.descriptor_version() != C::DESCRIPTOR_VERSION {
385            return Err(RuntimeFailure::ProtocolViolation { capability: C::ID });
386        }
387        let runtime = self
388            .runtime
389            .borrow()
390            .upgrade()
391            .ok_or(RuntimeFailure::AdmissionClosed)?;
392        Ok(NativeStreamHandle::from_endpoints(
393            std::slice::from_ref(&self.binding),
394            runtime,
395            &self.caller_instance,
396            true,
397        ))
398    }
399}
400
401impl PluginDependencyHandle {
402    /// Returns the Capability implemented by this handle.
403    pub fn capability_id(&self) -> &'static str {
404        self.binding.state.capability_id
405    }
406
407    /// Returns the exact Descriptor version implemented by this handle.
408    pub fn descriptor_version(&self) -> &'static str {
409        self.binding.state.descriptor_version
410    }
411
412    /// Returns the exact Operation table implemented by this handle.
413    pub fn operations(&self) -> &'static [&'static str] {
414        self.binding.state.operations
415    }
416
417    /// Invokes this exact resolved dependency through Kernel admission and supervision.
418    ///
419    /// Language Execution Adapters use this after their generated codec has decoded a
420    /// portable request into the provider's native erased value.
421    pub fn invoke_erased(
422        &self,
423        operation: &str,
424        request: Box<dyn Any>,
425        context: InvocationContext,
426    ) -> LocalBoxFuture<'static, Result<crate::ErasedDomainResult, RuntimeFailure>> {
427        let Some(runtime) = self.runtime.borrow().upgrade() else {
428            return Box::pin(futures::future::ready(Err(RuntimeFailure::AdmissionClosed)));
429        };
430        crate::request_handle::invoke_erased_dependency(
431            self.binding.clone(),
432            runtime,
433            self.caller_instance.clone(),
434            operation.to_owned(),
435            context,
436            request,
437        )
438    }
439
440    /// Converts this resolved dependency into its generated typed request handle.
441    pub fn typed<C: RequestCapability>(&self) -> Result<NativeRequestHandle<C>, RuntimeFailure> {
442        if self.capability_id() != C::ID || self.descriptor_version() != C::DESCRIPTOR_VERSION {
443            return Err(RuntimeFailure::ProtocolViolation { capability: C::ID });
444        }
445        let runtime = self
446            .runtime
447            .borrow()
448            .upgrade()
449            .ok_or(RuntimeFailure::AdmissionClosed)?;
450        Ok(NativeRequestHandle::from_endpoints(
451            std::slice::from_ref(&self.binding),
452            runtime,
453            &self.caller_instance,
454            true,
455        ))
456    }
457}
458
459/// The explicit Capability dependencies available during Plugin lifecycle.
460#[derive(Clone, Debug, Default)]
461pub struct PluginDependencies {
462    pub(super) requirements: Vec<lenso_app_plan::CapabilityRequirementPlan>,
463    pub(super) bindings: Vec<PluginDependency>,
464    pub(super) caller_instance: Rc<str>,
465    pub(super) runtime: Rc<RefCell<Weak<NativeAppRuntime>>>,
466}
467
468impl PluginDependencies {
469    pub(super) fn new(
470        caller_instance: impl Into<String>,
471        runtime: Rc<RefCell<Weak<NativeAppRuntime>>>,
472        requirements: Vec<lenso_app_plan::CapabilityRequirementPlan>,
473    ) -> Self {
474        Self {
475            requirements,
476            bindings: Vec::new(),
477            caller_instance: Rc::from(caller_instance.into()),
478            runtime,
479        }
480    }
481
482    /// Returns dependencies in the order materialized by the Resolved App Plan.
483    pub fn requirements(&self) -> &[lenso_app_plan::CapabilityRequirementPlan] {
484        &self.requirements
485    }
486
487    /// Narrows this view to one declared dependency, retaining optional absence.
488    pub fn requirement(&self, id: &str) -> Result<Self, RuntimeFailure> {
489        let requirement = self
490            .requirements
491            .iter()
492            .find(|requirement| requirement.requirement_id() == id)
493            .ok_or_else(|| RuntimeFailure::InvalidResolvedPlan {
494                detail: format!(
495                    "consumer `{}` has no requirement `{id}`",
496                    self.caller_instance
497                ),
498            })?;
499        Ok(Self {
500            requirements: vec![requirement.clone()],
501            bindings: self
502                .bindings
503                .iter()
504                .filter(|binding| binding.requirement_id() == id)
505                .cloned()
506                .collect(),
507            caller_instance: self.caller_instance.clone(),
508            runtime: self.runtime.clone(),
509        })
510    }
511
512    fn validate_lookup(
513        &self,
514        capability: &'static str,
515        version: &str,
516    ) -> Result<(), RuntimeFailure> {
517        let declarations = self
518            .requirements
519            .iter()
520            .filter(|requirement| requirement.capability_id() == capability)
521            .collect::<Vec<_>>();
522        match declarations.as_slice() {
523            [] => Err(RuntimeFailure::Unavailable { capability }),
524            [declaration] if declaration.descriptor_version() == version => Ok(()),
525            [_] => Err(RuntimeFailure::ProtocolViolation { capability }),
526            declarations => Err(RuntimeFailure::AmbiguousBinding {
527                capability,
528                providers: declarations.len(),
529            }),
530        }
531    }
532
533    /// Returns dependencies in the order materialized by the Resolved App Plan.
534    pub fn bindings(&self) -> &[PluginDependency] {
535        &self.bindings
536    }
537
538    /// Returns the number of explicit dependencies.
539    pub fn len(&self) -> usize {
540        self.bindings.len()
541    }
542
543    /// Returns whether this Plugin has no explicit dependencies.
544    pub fn is_empty(&self) -> bool {
545        self.bindings.is_empty()
546    }
547
548    /// Creates a Kernel Invocation Context for work initiated by this Plugin.
549    ///
550    /// The request identity and monotonic deadline come from the same Runtime
551    /// Driver as the App. The context is still owned by the caller and its
552    /// cancellation token remains explicit.
553    pub fn invocation_context(
554        &self,
555        deadline: Option<Duration>,
556        cancellation: CancellationToken,
557    ) -> Result<InvocationContext, RuntimeFailure> {
558        let runtime = self
559            .runtime
560            .borrow()
561            .upgrade()
562            .ok_or(RuntimeFailure::AdmissionClosed)?;
563        let request_id = runtime.request_ids.get();
564        runtime.request_ids.set(request_id.saturating_add(1));
565        Ok(InvocationContext::new(request_id, deadline, cancellation)
566            .with_shared_caller_instance(self.caller_instance.clone()))
567    }
568
569    /// Creates a Plugin Invocation Context with a Driver-relative deadline.
570    pub fn invocation_context_after(
571        &self,
572        timeout: Duration,
573        cancellation: CancellationToken,
574    ) -> Result<InvocationContext, RuntimeFailure> {
575        let runtime = self
576            .runtime
577            .borrow()
578            .upgrade()
579            .ok_or(RuntimeFailure::AdmissionClosed)?;
580        let deadline = (runtime.driver.now)().saturating_add(timeout);
581        drop(runtime);
582        self.invocation_context(Some(deadline), cancellation)
583    }
584
585    pub(super) fn shutdown_invocation_context(
586        &self,
587        deadline: Option<Duration>,
588        cancellation: CancellationToken,
589    ) -> Result<InvocationContext, RuntimeFailure> {
590        self.invocation_context(deadline, cancellation)
591            .map(InvocationContext::for_shutdown_dependency_call)
592    }
593
594    /// Returns the one explicitly bound typed dependency.
595    pub fn one<C: RequestCapability>(&self) -> Result<NativeRequestHandle<C>, RuntimeFailure> {
596        self.validate_lookup(C::ID, C::DESCRIPTOR_VERSION)?;
597        let handles: Vec<_> = self
598            .bindings
599            .iter()
600            .filter(|binding| binding.capability_id() == C::ID)
601            .filter_map(PluginDependency::handle)
602            .collect();
603        match handles.as_slice() {
604            [handle] => handle.typed::<C>(),
605            [] => Err(RuntimeFailure::Unavailable { capability: C::ID }),
606            handles => Err(RuntimeFailure::AmbiguousBinding {
607                capability: C::ID,
608                providers: handles.len(),
609            }),
610        }
611    }
612
613    /// Returns an optional explicitly bound typed dependency.
614    pub fn optional<C: RequestCapability>(
615        &self,
616    ) -> Result<Option<NativeRequestHandle<C>>, RuntimeFailure> {
617        self.validate_lookup(C::ID, C::DESCRIPTOR_VERSION)?;
618        match self
619            .bindings
620            .iter()
621            .filter(|binding| binding.capability_id() == C::ID)
622            .filter_map(PluginDependency::handle)
623            .collect::<Vec<_>>()
624            .as_slice()
625        {
626            [] => Ok(None),
627            [handle] => handle.typed::<C>().map(Some),
628            handles => Err(RuntimeFailure::AmbiguousBinding {
629                capability: C::ID,
630                providers: handles.len(),
631            }),
632        }
633    }
634
635    /// Returns all explicitly bound typed dependencies in resolved provider order.
636    pub fn many<C: RequestCapability>(
637        &self,
638    ) -> Result<Vec<NativeRequestHandle<C>>, RuntimeFailure> {
639        self.validate_lookup(C::ID, C::DESCRIPTOR_VERSION)?;
640        self.bindings
641            .iter()
642            .filter(|binding| binding.capability_id() == C::ID)
643            .filter_map(PluginDependency::handle)
644            .map(|handle| handle.typed::<C>())
645            .collect()
646    }
647
648    /// Returns the one explicitly bound typed stream dependency.
649    pub fn one_stream<C: StreamCapability>(&self) -> Result<NativeStreamHandle<C>, RuntimeFailure> {
650        self.validate_lookup(C::ID, C::DESCRIPTOR_VERSION)?;
651        let handles: Vec<_> = self
652            .bindings
653            .iter()
654            .filter(|binding| binding.capability_id() == C::ID)
655            .filter_map(PluginDependency::stream_handle)
656            .collect();
657        match handles.as_slice() {
658            [handle] => handle.typed::<C>(),
659            [] => Err(RuntimeFailure::Unavailable { capability: C::ID }),
660            handles => Err(RuntimeFailure::AmbiguousBinding {
661                capability: C::ID,
662                providers: handles.len(),
663            }),
664        }
665    }
666
667    /// Returns an optional explicitly bound typed stream dependency.
668    pub fn optional_stream<C: StreamCapability>(
669        &self,
670    ) -> Result<Option<NativeStreamHandle<C>>, RuntimeFailure> {
671        self.validate_lookup(C::ID, C::DESCRIPTOR_VERSION)?;
672        match self
673            .bindings
674            .iter()
675            .filter(|binding| binding.capability_id() == C::ID)
676            .filter_map(PluginDependency::stream_handle)
677            .collect::<Vec<_>>()
678            .as_slice()
679        {
680            [] => Ok(None),
681            [handle] => handle.typed::<C>().map(Some),
682            handles => Err(RuntimeFailure::AmbiguousBinding {
683                capability: C::ID,
684                providers: handles.len(),
685            }),
686        }
687    }
688
689    /// Returns all explicitly bound typed stream dependencies in Plan order.
690    pub fn many_stream<C: StreamCapability>(
691        &self,
692    ) -> Result<Vec<NativeStreamHandle<C>>, RuntimeFailure> {
693        self.validate_lookup(C::ID, C::DESCRIPTOR_VERSION)?;
694        self.bindings
695            .iter()
696            .filter(|binding| binding.capability_id() == C::ID)
697            .filter_map(PluginDependency::stream_handle)
698            .map(|handle| handle.typed::<C>())
699            .collect()
700    }
701
702    /// Returns one typed Event handle over every explicit binding in Plan order.
703    pub fn many_event<C: EventCapability>(&self) -> Result<NativeEventHandle<C>, RuntimeFailure> {
704        self.validate_lookup(C::ID, C::DESCRIPTOR_VERSION)?;
705        let handles: Vec<_> = self
706            .bindings
707            .iter()
708            .filter(|binding| binding.capability_id() == C::ID)
709            .filter_map(PluginDependency::event_handle)
710            .collect();
711        if handles.iter().any(|handle| {
712            handle.capability_id() != C::ID || handle.descriptor_version() != C::DESCRIPTOR_VERSION
713        }) {
714            return Err(RuntimeFailure::ProtocolViolation { capability: C::ID });
715        }
716        let runtime = self
717            .runtime
718            .borrow()
719            .upgrade()
720            .ok_or(RuntimeFailure::AdmissionClosed)?;
721        let endpoints = handles
722            .iter()
723            .map(|handle| handle.binding.clone())
724            .collect::<Vec<_>>();
725        Ok(NativeEventHandle::from_endpoints(
726            &endpoints,
727            runtime,
728            &self.caller_instance,
729            true,
730        ))
731    }
732
733    /// Returns the one explicitly bound typed Event dependency.
734    pub fn one_event<C: EventCapability>(&self) -> Result<NativeEventHandle<C>, RuntimeFailure> {
735        self.validate_lookup(C::ID, C::DESCRIPTOR_VERSION)?;
736        match self
737            .bindings
738            .iter()
739            .filter(|binding| binding.capability_id() == C::ID)
740            .filter_map(PluginDependency::event_handle)
741            .collect::<Vec<_>>()
742            .as_slice()
743        {
744            [handle] => handle.typed::<C>(),
745            [] => Err(RuntimeFailure::Unavailable { capability: C::ID }),
746            handles => Err(RuntimeFailure::AmbiguousBinding {
747                capability: C::ID,
748                providers: handles.len(),
749            }),
750        }
751    }
752
753    /// Returns an optional explicitly bound typed Event dependency.
754    pub fn optional_event<C: EventCapability>(
755        &self,
756    ) -> Result<Option<NativeEventHandle<C>>, RuntimeFailure> {
757        self.validate_lookup(C::ID, C::DESCRIPTOR_VERSION)?;
758        match self
759            .bindings
760            .iter()
761            .filter(|binding| binding.capability_id() == C::ID)
762            .filter_map(PluginDependency::event_handle)
763            .collect::<Vec<_>>()
764            .as_slice()
765        {
766            [] => Ok(None),
767            [handle] => handle.typed::<C>().map(Some),
768            handles => Err(RuntimeFailure::AmbiguousBinding {
769                capability: C::ID,
770                providers: handles.len(),
771            }),
772        }
773    }
774}
lenso_kernel/request.rs

lenso_kernel/
request.rs
