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/*
*
* 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
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