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import type { Factorable } from '../interfaces/factory.interface.mjs'
import type {
ClassType,
ClassTypeWithArgument,
FactoryInjectionToken,
InjectionTokenSchemaType,
} from '../token/injection-token.mjs'
import type { Registry } from '../token/registry.mjs'
import type { Join, UnionToArray } from '../utils/types.mjs'
import type { NameResolver } from '../internal/core/name-resolver.mjs'
import type { ServiceInvalidator } from '../internal/core/service-invalidator.mjs'
import type { TokenResolver } from '../internal/core/token-resolver.mjs'
import { InjectableScope } from '../enums/index.mjs'
import { UnifiedStorage } from '../internal/holder/unified-storage.mjs'
import {
BoundInjectionToken,
InjectionToken,
} from '../token/injection-token.mjs'
import { AbstractContainer } from './abstract-container.mjs'
import { Container } from './container.mjs'
/**
* Request-scoped dependency injection container.
*
* Wraps a parent Container and provides isolated request-scoped instances
* while delegating singleton and transient resolution to the parent.
* This design eliminates race conditions that can occur with async operations
* when multiple requests are processed concurrently.
*/
export class ScopedContainer extends AbstractContainer {
protected readonly defaultScope = InjectableScope.Request
private readonly storage: UnifiedStorage
private disposed = false
private readonly metadata: Record<string, any>
constructor(
private readonly parent: Container,
private readonly registry: Registry,
public readonly requestId: string,
metadata?: Record<string, any>,
) {
super()
// Create own unified storage for request-scoped services
this.storage = new UnifiedStorage(InjectableScope.Request)
this.metadata = metadata || {}
}
// ============================================================================
// ABSTRACT METHOD IMPLEMENTATIONS - Delegate to parent
// ============================================================================
getStorage(): UnifiedStorage {
return this.storage
}
protected getRegistry(): Registry {
return this.registry
}
protected getTokenResolver(): TokenResolver {
return this.parent.getTokenResolver()
}
protected getNameResolver(): NameResolver {
return this.parent.getNameResolver()
}
protected getServiceInvalidator(): ServiceInvalidator {
return this.parent.getServiceInvalidator()
}
// ============================================================================
// SCOPED CONTAINER SPECIFIC METHODS
// ============================================================================
/**
* Gets the request ID for this scoped container.
*/
getRequestId(): string {
return this.requestId
}
/**
* Gets the parent container.
*/
getParent(): Container {
return this.parent
}
/**
* Gets metadata from the request context.
*/
getMetadata(key: string): any | undefined {
return this.metadata[key]
}
/**
* Sets metadata on the request context.
*/
setMetadata(key: string, value: any): void {
this.metadata[key] = value
}
/**
* Gets an instance from the container.
* Request-scoped services are resolved from this container's storage.
* All other services are delegated to the parent container.
*/
// #1 Simple class
get<T extends ClassType>(
token: T,
): InstanceType<T> extends Factorable<infer R>
? Promise<R>
: Promise<InstanceType<T>>
// #1.1 Simple class with args
get<T extends ClassTypeWithArgument<R>, R>(
token: T,
args: R,
): Promise<InstanceType<T>>
// #2 Token with required Schema
get<T, S extends InjectionTokenSchemaType>(
token: InjectionToken<T, S>,
args: z.input<S>,
): Promise<T>
// #3 Token with optional Schema
get<T, S extends InjectionTokenSchemaType, R extends boolean>(
token: InjectionToken<T, S, R>,
): R extends false
? Promise<T>
: S extends ZodType<infer Type>
? `Error: Your token requires args: ${Join<
UnionToArray<keyof Type>,
', '
>}`
: 'Error: Your token requires args'
// #4 Token with no Schema
get<T>(token: InjectionToken<T, undefined>): Promise<T>
get<T>(token: BoundInjectionToken<T, any>): Promise<T>
get<T>(token: FactoryInjectionToken<T, any>): Promise<T>
async get(
token:
| ClassType
| InjectionToken<any>
| BoundInjectionToken<any, any>
| FactoryInjectionToken<any, any>,
args?: unknown,
) {
if (this.disposed) {
throw new Error('ScopedContainer has been disposed')
}
// Check if this is a request-scoped service
const tokenResolver = this.getTokenResolver()
const realToken = tokenResolver.getRegistryToken(token)
Eif (this.registry.has(realToken)) {
const record = this.registry.get(realToken)
if (record.scope === InjectableScope.Request) {
// Resolve request-scoped service from this container
const [error, instance] = await this.parent
.getInstanceResolver()
.resolveRequestScopedInstance(token, args, this)
Iif (error) {
throw error
}
return instance
}
}
// Delegate singleton/transient services to parent
const [error, instance] = await this.parent
.getInstanceResolver()
.resolveInstance(token, args, this, this.storage, this.requestId)
Iif (error) {
throw error
}
return instance
}
/**
* Invalidates a service and its dependencies.
*/
async invalidate(service: unknown): Promise<void> {
// Find the service by instance in request storage
const holder = this.storage.findByInstance(service)
Iif (!holder) {
// Try parent storage
return this.parent.invalidate(service)
}
await this.getServiceInvalidator().invalidateWithStorage(
holder.name,
this.storage,
)
}
/**
* Disposes the container and cleans up all resources.
* Alias for endRequest().
*/
async dispose(): Promise<void> {
return this.endRequest()
}
/**
* @internal
* Attempts to get an instance synchronously if it already exists.
* Checks request storage first, then delegates to parent.
*/
override tryGetSync<T>(token: any, args?: any): T | null {
// Check request storage first for request-scoped services
const tokenResolver = this.getTokenResolver()
const realToken = tokenResolver.getRegistryToken(token)
const scope = this.registry.has(realToken)
? this.registry.get(realToken).scope
: InjectableScope.Singleton
if (scope === InjectableScope.Request) {
const result = this.tryGetSyncFromStorage<T>(
token,
args,
this.storage,
this.requestId,
)
if (result !== null) {
return result
}
}
// Delegate to parent for singleton/transient
return this.parent.tryGetSync<T>(token, args, this.requestId)
}
/**
* Adds an instance to the container.
* Overrides base class to check disposed state.
*/
override addInstance<T>(
token: ClassType | InjectionToken<T, any> | BoundInjectionToken<T, any>,
instance: T,
): void {
if (this.disposed) {
throw new Error('ScopedContainer has been disposed')
}
super.addInstance(token, instance)
}
/**
* Ends the request and cleans up all request-scoped services.
*/
async endRequest(): Promise<void> {
Iif (this.disposed) {
return
}
this.disposed = true
// Clear all request-scoped services
await this.getServiceInvalidator().clearAllWithStorage(this.storage)
// Remove request ID from parent
this.parent.removeRequestId(this.requestId)
}
}
|