feat(datastore): refactor datastore category to use APICategoryGraphQLBehavior #3666
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,100 @@ | ||
| // | ||
| // Copyright Amazon.com Inc. or its affiliates. | ||
| // All Rights Reserved. | ||
| // | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
| // | ||
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| import Combine | ||
| /** | ||
| A non-deterministic operation offers multiple paths to accomplish its task. | ||
| It attempts the next path if all preceding paths have failed with an error that allows for continuation. | ||
| */ | ||
| enum NondeterminsticOperationError: Error { | ||
| case totalFailure | ||
| case cancelled | ||
| } | ||
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| final class NondeterminsticOperation<T> { | ||
| /// operation that to be eval | ||
| typealias Operation = () async throws -> T | ||
| typealias OnError = (Error) -> Bool | ||
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| private let operations: AsyncStream<Operation> | ||
| private var shouldTryNextOnError: OnError = { _ in true } | ||
| private var cancellables = Set<AnyCancellable>() | ||
| private var task: Task<Void, Never>? | ||
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| deinit { | ||
| cancel() | ||
| } | ||
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| init(operations: AsyncStream<Operation>, shouldTryNextOnError: OnError? = nil) { | ||
| self.operations = operations | ||
| if let shouldTryNextOnError { | ||
| self.shouldTryNextOnError = shouldTryNextOnError | ||
| } | ||
| } | ||
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| convenience init( | ||
| operationStream: AnyPublisher<Operation, Never>, | ||
| shouldTryNextOnError: OnError? = nil | ||
| ) { | ||
| var cancellables = Set<AnyCancellable>() | ||
| let (asyncStream, continuation) = AsyncStream.makeStream(of: Operation.self) | ||
| operationStream.sink { _ in | ||
| continuation.finish() | ||
| } receiveValue: { | ||
| continuation.yield($0) | ||
| }.store(in: &cancellables) | ||
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| self.init( | ||
| operations: asyncStream, | ||
| shouldTryNextOnError: shouldTryNextOnError | ||
| ) | ||
| self.cancellables = cancellables | ||
| } | ||
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| /// Synchronous version of executing the operations | ||
| func execute() -> Future<T, Error> { | ||
| Future { [weak self] promise in | ||
| self?.task = Task { [weak self] in | ||
| do { | ||
| if let self { | ||
| promise(.success(try await self.run())) | ||
| } else { | ||
| promise(.failure(NondeterminsticOperationError.cancelled)) | ||
| } | ||
| } catch { | ||
| promise(.failure(error)) | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| /// Asynchronous version of executing the operations | ||
| func run() async throws -> T { | ||
| for await operation in operations { | ||
| if Task.isCancelled { | ||
| throw NondeterminsticOperationError.cancelled | ||
| } | ||
| do { | ||
| return try await operation() | ||
| } catch { | ||
| if shouldTryNextOnError(error) { | ||
| continue | ||
| } else { | ||
| throw error | ||
| } | ||
| } | ||
| } | ||
| throw NondeterminsticOperationError.totalFailure | ||
| } | ||
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| /// Cancel the operation | ||
| func cancel() { | ||
| task?.cancel() | ||
| cancellables = Set<AnyCancellable>() | ||
| } | ||
| } | ||
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