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First experiments with a NIO-based gRPC server.
Contains the following commits: - Refactor gRPC decoding into dedicated codec classes. - Start work on GRPCServerHandler. - Add a "unary call handler" and use that for the tests. - Refactoring starting a GRPC server into a dedicated class. - Fix sending unary responses. - Add a handler for client-streaming calls. - Also implement bidirectional-streaming calls. - Make sure to flush in server-streaming calls after each sent message. - Add the missing test cases to `allTests`. - Refactor `StatusSendingHandler` into its own class. - Rename `GRPCServerHandler` to `GRPCChannelHandler`. - Remove a FIXME. - Add a few more comments. - Attach the actual call handlers as channel handlers instead of manually forwarding messages to them. # This is the commit message grpc#2: Remove SwiftGRPCNIO's dependency on SwiftGRPC and move the responsibility for encoding GRPC statuses to HTTP1ToRawGRPCServerCoded. # This is the commit message grpc#3: Temporarily disable two test cases that are failing at the moment. # This is the commit message grpc#4: Add SwiftGRPCNIO as an exposed library. # This is the commit message grpc#5: Another try at getting CI to work with SwiftGRPCNIO. # This is the commit message grpc#6: More dependency fixes. # This is the commit message grpc#7: Add `SwiftGRPCNIO.EchoServerTests` to LinuxMain.swift. # This is the commit message grpc#8: Fix a string comparison in `.travis-install.sh`. # This is the commit message grpc#9: Add nghttp2 to the list of CI dependencies. # This is the commit message grpc#10: Another try with installing nghttp2 via brew. # This is the commit message grpc#11: Another try at using libnghttp2-dev under Ubuntu 14.04. # This is the commit message grpc#12: More Travis fixes. # This is the commit message grpc#13: One last try. # This is the commit message grpc#2: Disable two more tests for now, as they sometimes fail on CI. # This is the commit message grpc#3: Make Carthage debug builds verbose. # This is the commit message grpc#4: Only use SwiftGRPC-Carthage.xcodeproj for Carthage builds.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| /* | ||
| * Copyright 2016, gRPC Authors All rights reserved. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| import Foundation | ||
|
|
||
| /// Status codes for gRPC operations (replicated from status_code_enum.h) | ||
| public enum StatusCode: Int { | ||
| /// Not an error; returned on success. | ||
| case ok = 0 | ||
|
|
||
| /// The operation was cancelled (typically by the caller). | ||
| case cancelled = 1 | ||
|
|
||
| /// Unknown error. An example of where this error may be returned is if a | ||
| /// Status value received from another address space belongs to an error-space | ||
| /// that is not known in this address space. Also errors raised by APIs that | ||
| /// do not return enough error information may be converted to this error. | ||
| case unknown = 2 | ||
|
|
||
| /// Client specified an invalid argument. Note that this differs from | ||
| /// FAILED_PRECONDITION. INVALID_ARGUMENT indicates arguments that are | ||
| /// problematic regardless of the state of the system (e.g., a malformed file | ||
| /// name). | ||
| case invalidArgument = 3 | ||
|
|
||
| /// Deadline expired before operation could complete. For operations that | ||
| /// change the state of the system, this error may be returned even if the | ||
| /// operation has completed successfully. For example, a successful response | ||
| /// from a server could have been delayed long enough for the deadline to | ||
| /// expire. | ||
| case deadlineExceeded = 4 | ||
|
|
||
| /// Some requested entity (e.g., file or directory) was not found. | ||
| case notFound = 5 | ||
|
|
||
| /// Some entity that we attempted to create (e.g., file or directory) already | ||
| /// exists. | ||
| case alreadyExists = 6 | ||
|
|
||
| /// The caller does not have permission to execute the specified operation. | ||
| /// PERMISSION_DENIED must not be used for rejections caused by exhausting | ||
| /// some resource (use RESOURCE_EXHAUSTED instead for those errors). | ||
| /// PERMISSION_DENIED must not be used if the caller can not be identified | ||
| /// (use UNAUTHENTICATED instead for those errors). | ||
| case permissionDenied = 7 | ||
|
|
||
| /// The request does not have valid authentication credentials for the | ||
| /// operation. | ||
| case unauthenticated = 16 | ||
|
|
||
| /// Some resource has been exhausted, perhaps a per-user quota, or perhaps the | ||
| /// entire file system is out of space. | ||
| case resourceExhausted = 8 | ||
|
|
||
| /// Operation was rejected because the system is not in a state required for | ||
| /// the operation's execution. For example, directory to be deleted may be | ||
| /// non-empty, an rmdir operation is applied to a non-directory, etc. | ||
| /// | ||
| /// A litmus test that may help a service implementor in deciding | ||
| /// between FAILED_PRECONDITION, ABORTED, and UNAVAILABLE: | ||
| /// (a) Use UNAVAILABLE if the client can retry just the failing call. | ||
| /// (b) Use ABORTED if the client should retry at a higher-level | ||
| /// (e.g., restarting a read-modify-write sequence). | ||
| /// (c) Use FAILED_PRECONDITION if the client should not retry until | ||
| /// the system state has been explicitly fixed. E.g., if an "rmdir" | ||
| /// fails because the directory is non-empty, FAILED_PRECONDITION | ||
| /// should be returned since the client should not retry unless | ||
| /// they have first fixed up the directory by deleting files from it. | ||
| /// (d) Use FAILED_PRECONDITION if the client performs conditional | ||
| /// REST Get/Update/Delete on a resource and the resource on the | ||
| /// server does not match the condition. E.g., conflicting | ||
| /// read-modify-write on the same resource. | ||
| case failedPrecondition = 9 | ||
|
|
||
| /// The operation was aborted, typically due to a concurrency issue like | ||
| /// sequencer check failures, transaction aborts, etc. | ||
| /// | ||
| /// See litmus test above for deciding between FAILED_PRECONDITION, ABORTED, | ||
| /// and UNAVAILABLE. | ||
| case aborted = 10 | ||
|
|
||
| /// Operation was attempted past the valid range. E.g., seeking or reading | ||
| /// past end of file. | ||
| /// | ||
| /// Unlike INVALID_ARGUMENT, this error indicates a problem that may be fixed | ||
| /// if the system state changes. For example, a 32-bit file system will | ||
| /// generate INVALID_ARGUMENT if asked to read at an offset that is not in the | ||
| /// range [0,2^32-1], but it will generate OUT_OF_RANGE if asked to read from | ||
| /// an offset past the current file size. | ||
| /// | ||
| /// There is a fair bit of overlap between FAILED_PRECONDITION and | ||
| /// OUT_OF_RANGE. We recommend using OUT_OF_RANGE (the more specific error) | ||
| /// when it applies so that callers who are iterating through a space can | ||
| /// easily look for an OUT_OF_RANGE error to detect when they are done. | ||
| case outOfRange = 11 | ||
|
|
||
| /// Operation is not implemented or not supported/enabled in this service. | ||
| case unimplemented = 12 | ||
|
|
||
| /// Internal errors. Means some invariants expected by underlying System has | ||
| /// been broken. If you see one of these errors, Something is very broken. | ||
| case internalError = 13 | ||
|
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||
| /// The service is currently unavailable. This is a most likely a transient | ||
| /// condition and may be corrected by retrying with a backoff. | ||
| /// | ||
| /// See litmus test above for deciding between FAILED_PRECONDITION, ABORTED, | ||
| /// and UNAVAILABLE. | ||
| case unavailable = 14 | ||
|
|
||
| /// Unrecoverable data loss or corruption. | ||
| case dataLoss = 15 | ||
|
|
||
| /// Force users to include a default branch: | ||
| case doNotUse = -1 | ||
| } |
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36 changes: 36 additions & 0 deletions
36
Sources/SwiftGRPCNIO/BidirectionalStreamingCallHandler.swift
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| import Foundation | ||
| import SwiftProtobuf | ||
| import NIO | ||
| import NIOHTTP1 | ||
|
|
||
| public class BidirectionalStreamingCallHandler<RequestMessage: Message, ResponseMessage: Message>: StatusSendingHandler<RequestMessage, ResponseMessage> { | ||
| public typealias HandlerImplementation = (StreamEvent<RequestMessage>) -> Void | ||
| fileprivate var handlerImplementation: HandlerImplementation? | ||
|
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| public init(eventLoop: EventLoop, handlerImplementationFactory: (BidirectionalStreamingCallHandler<RequestMessage, ResponseMessage>) -> HandlerImplementation) { | ||
| super.init(eventLoop: eventLoop) | ||
|
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| self.handlerImplementation = handlerImplementationFactory(self) | ||
| self.statusPromise.futureResult.whenComplete { [weak self] in | ||
| self?.handlerImplementation = nil | ||
| } | ||
| } | ||
|
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| public override func processMessage(_ message: RequestMessage) { | ||
| handlerImplementation?(.message(message)) | ||
| } | ||
|
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| public override func endOfStreamReceived() { | ||
| handlerImplementation?(.end) | ||
| } | ||
|
|
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| public func sendMessage(_ message: ResponseMessage) -> EventLoopFuture<Void> { | ||
| let promise: EventLoopPromise<Void> = eventLoop.newPromise() | ||
| ctx?.writeAndFlush(self.wrapOutboundOut(.message(message)), promise: promise) | ||
| return promise.futureResult | ||
| } | ||
|
|
||
| public func sendStatus(_ status: GRPCStatus) { | ||
| self.statusPromise.succeed(result: status) | ||
| } | ||
| } |
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