@metamask/ocap-kernel
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OCap kernel core components
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type {\n SwingSetCapData,\n VatOneResolution,\n VatSyscallObject,\n VatSyscallResult,\n} from '@agoric/swingset-liveslots';\nimport { Logger } from '@metamask/logger';\n\nimport type { KernelQueue } from './KernelQueue.ts';\nimport { makeError } from './services/kernel-marshal.ts';\nimport type { KernelStore } from './store/index.ts';\nimport { parseRef } from './store/utils/parse-ref.ts';\nimport { coerceMessage } from './types.ts';\nimport type { Message, VatId, KRef } from './types.ts';\n\ntype VatSyscallProps = {\n vatId: VatId;\n kernelQueue: KernelQueue;\n kernelStore: KernelStore;\n logger?: Logger;\n};\n\n/**\n * A VatSyscall is a class that handles syscalls from a vat.\n *\n * This class is responsible for handling syscalls from a vat, including\n * sending messages, resolving promises, and dropping imports.\n */\nexport class VatSyscall {\n /** The ID of the vat */\n readonly vatId: VatId;\n\n /** The kernel's run queue */\n readonly #kernelQueue: KernelQueue;\n\n /** The kernel's store */\n readonly #kernelStore: KernelStore;\n\n /** Logger for outputting messages (such as errors) to the console */\n readonly #logger: Logger | undefined;\n\n /** The illegal syscall that was received */\n illegalSyscall: { vatId: VatId; info: SwingSetCapData } | undefined;\n\n /** The error when delivery failed */\n deliveryError: string | undefined;\n\n /** The termination request that was received from the vat with syscall.exit() */\n vatRequestedTermination:\n | { reject: boolean; info: SwingSetCapData }\n | undefined;\n\n /**\n * Construct a new VatSyscall instance.\n *\n * @param props - The properties for the VatSyscall.\n * @param props.vatId - The ID of the vat.\n * @param props.kernelQueue - The kernel's run queue.\n * @param props.kernelStore - The kernel's store.\n * @param props.logger - The logger for the VatSyscall.\n */\n constructor({ vatId, kernelQueue, kernelStore, logger }: VatSyscallProps) {\n this.vatId = vatId;\n this.#kernelQueue = kernelQueue;\n this.#kernelStore = kernelStore;\n this.#logger = logger;\n }\n\n /**\n * Handle a 'send' syscall from the vat.\n *\n * @param target - The target of the message send.\n * @param message - The message that was sent.\n */\n #handleSyscallSend(target: KRef, message: Message): void {\n this.#kernelQueue.enqueueSend(target, message);\n }\n\n /**\n * Handle a 'resolve' syscall from the vat.\n *\n * @param resolutions - One or more promise resolutions.\n */\n #handleSyscallResolve(resolutions: VatOneResolution[]): void {\n this.#kernelQueue.resolvePromises(this.vatId, resolutions);\n }\n\n /**\n * Handle a 'subscribe' syscall from the vat.\n *\n * @param kpid - The KRef of the promise being subscribed to.\n */\n #handleSyscallSubscribe(kpid: KRef): void {\n const kp = this.#kernelStore.getKernelPromise(kpid);\n if (kp.state === 'unresolved') {\n this.#kernelStore.addPromiseSubscriber(this.vatId, kpid);\n } else {\n this.#kernelQueue.enqueueNotify(this.vatId, kpid);\n }\n }\n\n /**\n * Handle a 'dropImports' syscall from the vat.\n *\n * @param krefs - The KRefs of the imports to be dropped.\n */\n #handleSyscallDropImports(krefs: KRef[]): void {\n for (const kref of krefs) {\n const { direction, isPromise } = parseRef(kref);\n // We validate it's an import - meaning this vat received this object from somewhere else\n if (direction === 'export' || isPromise) {\n throw Error(\n `vat ${this.vatId} issued invalid syscall dropImports for ${kref}`,\n );\n }\n this.#kernelStore.clearReachableFlag(this.vatId, kref);\n }\n }\n\n /**\n * Handle a 'retireImports' syscall from the vat.\n *\n * @param krefs - The KRefs of the imports to be retired.\n */\n #handleSyscallRetireImports(krefs: KRef[]): void {\n for (const kref of krefs) {\n const { direction, isPromise } = parseRef(kref);\n // We validate it's an import - meaning this vat received this object from somewhere else\n if (direction === 'export' || isPromise) {\n throw Error(\n `vat ${this.vatId} issued invalid syscall retireImports for ${kref}`,\n );\n }\n if (this.#kernelStore.getReachableFlag(this.vatId, kref)) {\n throw Error(`syscall.retireImports but ${kref} is still reachable`);\n }\n // deleting the clist entry will decrement the recognizable count, but\n // not the reachable count (because it was unreachable, as we asserted)\n this.#kernelStore.forgetKref(this.vatId, kref);\n }\n }\n\n /**\n * Handle retiring or abandoning exports syscall from the vat.\n *\n * @param krefs - The KRefs of the exports to be retired/abandoned.\n * @param checkReachable - If true, verify the object is not reachable (retire). 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