| /* |
| * |
| * Copyright 2015, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #import "ProtoRPC.h" |
| |
| #import <GPBProtocolBuffers.h> |
| #import <RxLibrary/GRXWriteable.h> |
| #import <RxLibrary/GRXWriter+Transformations.h> |
| |
| static NSError *ErrorForBadProto(id proto, Class expectedClass, NSError *parsingError) { |
| NSDictionary *info = @{ |
| NSLocalizedDescriptionKey: @"Unable to parse response from the server", |
| NSLocalizedRecoverySuggestionErrorKey: @"If this RPC is idempotent, retry " |
| @"with exponential backoff. Otherwise, query the server status before " |
| @"retrying.", |
| NSUnderlyingErrorKey: parsingError, |
| @"Expected class": expectedClass, |
| @"Received value": proto, |
| }; |
| // TODO(jcanizales): Use kGRPCErrorDomain and GRPCErrorCodeInternal when they're public. |
| return [NSError errorWithDomain:@"io.grpc" |
| code:13 |
| userInfo:info]; |
| } |
| |
| @implementation ProtoRPC { |
| id<GRXWriteable> _responseWriteable; |
| } |
| |
| #pragma clang diagnostic push |
| #pragma clang diagnostic ignored "-Wobjc-designated-initializers" |
| - (instancetype)initWithHost:(NSString *)host |
| path:(NSString *)path |
| requestsWriter:(GRXWriter *)requestsWriter { |
| [NSException raise:NSInvalidArgumentException |
| format:@"Please use ProtoRPC's designated initializer instead."]; |
| return nil; |
| } |
| #pragma clang diagnostic pop |
| |
| // Designated initializer |
| - (instancetype)initWithHost:(NSString *)host |
| method:(ProtoMethod *)method |
| requestsWriter:(GRXWriter *)requestsWriter |
| responseClass:(Class)responseClass |
| responsesWriteable:(id<GRXWriteable>)responsesWriteable { |
| // Because we can't tell the type system to constrain the class, we need to check at runtime: |
| if (![responseClass respondsToSelector:@selector(parseFromData:error:)]) { |
| [NSException raise:NSInvalidArgumentException |
| format:@"A protobuf class to parse the responses must be provided."]; |
| } |
| // A writer that serializes the proto messages to send. |
| GRXWriter *bytesWriter = [requestsWriter map:^id(GPBMessage *proto) { |
| if (![proto isKindOfClass:GPBMessage.class]) { |
| [NSException raise:NSInvalidArgumentException |
| format:@"Request must be a proto message: %@", proto]; |
| } |
| return [proto data]; |
| }]; |
| if ((self = [super initWithHost:host path:method.HTTPPath requestsWriter:bytesWriter])) { |
| __weak ProtoRPC *weakSelf = self; |
| |
| // A writeable that parses the proto messages received. |
| _responseWriteable = [[GRXWriteable alloc] initWithValueHandler:^(NSData *value) { |
| // TODO(jcanizales): This is done in the main thread, and needs to happen in another thread. |
| NSError *error = nil; |
| id parsed = [responseClass parseFromData:value error:&error]; |
| if (parsed) { |
| [responsesWriteable writeValue:parsed]; |
| } else { |
| [weakSelf finishWithError:ErrorForBadProto(value, responseClass, error)]; |
| } |
| } completionHandler:^(NSError *errorOrNil) { |
| [responsesWriteable writesFinishedWithError:errorOrNil]; |
| }]; |
| } |
| return self; |
| } |
| |
| - (void)start { |
| [self startWithWriteable:_responseWriteable]; |
| } |
| |
| - (void)startWithWriteable:(id<GRXWriteable>)writeable { |
| [super startWithWriteable:writeable]; |
| // Break retain cycles. |
| _responseWriteable = nil; |
| } |
| @end |