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// Copyright 2020 Google LLC
//
// 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
//
// https://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 "internal/platform/implementation/ios/Mediums/Ble/Sockets/Source/Shared/GNSSocket+Private.h"
#import "internal/platform/implementation/ios/Mediums/Ble/Sockets/Source/Shared/GNSWeavePacket.h"
#import "GoogleToolboxForMac/GTMLogger.h"
typedef void (^GNSIncomingChunkReceivedBlock)(NSData *incomingData);
@interface GNSSocket () {
NSMutableData *_incomingBuffer;
id _peer;
}
// Handler to generate a chunk for sending data. When the bluetooth stack is ready to send
// more data the handler is called recursively to send the next chunk.
@property(nonatomic, copy) GNSSendChunkBlock sendChunkCallback;
// Handler to receive chunk from the central.
@property(nonatomic, copy) GNSIncomingChunkReceivedBlock incomingChunkReceivedCallback;
@property(nonatomic, readwrite, assign, getter=isConnected) BOOL connected;
@property(nonatomic, readwrite) NSUUID *socketIdentifier;
- (instancetype)initWithOwner:(id<GNSSocketOwner>)owner
peer:(id)peer
queue:(dispatch_queue_t)queue NS_DESIGNATED_INITIALIZER;
@end
@implementation GNSSocket
- (void)dealloc {
[_owner socketWillBeDeallocated:self];
}
- (BOOL)isSendOperationInProgress {
return self.sendChunkCallback != nil;
}
- (void)sendData:(NSData *)data
progressHandler:(GNSProgressHandler)progressHandler
completion:(GNSErrorHandler)completion {
void (^callCompletion)(NSError *) = ^(NSError *error) {
if (completion) dispatch_async(_queue, ^{ completion(error); });
};
if (self.sendChunkCallback) {
GTMLoggerInfo(@"Send operation already in progress");
callCompletion(GNSErrorWithCode(GNSErrorOperationInProgress));
return;
}
data = [data copy];
NSUInteger totalDataSize = data.length;
GTMLoggerInfo(@"Sending data with size %lu", (unsigned long)totalDataSize);
// Capture self for the duration of the send operation, to ensure it is completely sent.
// If the connection is lost, the block will be deleted and the retain cycle broken.
__typeof__(self) selfRef = self; // this avoids the retain cycle compiler warning
self.sendChunkCallback = ^(NSUInteger offset) {
__typeof__(self) self = selfRef;
if (!self.isConnected) {
self.sendChunkCallback = nil;
callCompletion(GNSErrorWithCode(GNSErrorNoConnection));
return;
}
if (progressHandler) {
float progressPercentage = 1.0;
if (totalDataSize > 0) {
progressPercentage = (float)offset / totalDataSize;
}
progressHandler(progressPercentage);
}
NSUInteger newOffset = offset;
GNSWeaveDataPacket *dataPacket =
[GNSWeaveDataPacket dataPacketWithPacketCounter:self.sendPacketCounter
packetSize:self.packetSize
data:data
offset:&newOffset];
[self incrementSendPacketCounter];
GTMLoggerInfo(@"Sending chunk with size %ld", (long)(newOffset - offset));
[self.owner sendData:[dataPacket serialize] socket:self completion:^(NSError *_Nullable error) {
if (error) {
GTMLoggerInfo(@"Error sending chunk");
self.sendChunkCallback = nil;
callCompletion(error);
} else {
if (newOffset < totalDataSize) {
// Dispatch async to avoid stack overflow on large payloads.
dispatch_async(self.queue, ^{ self.sendChunkCallback(newOffset); });
} else {
GTMLoggerInfo(@"Finished sending payload");
self.sendChunkCallback = nil;
callCompletion(nil);
}
}
}];
};
self.sendChunkCallback(0);
}
- (void)disconnect {
if (!_connected) {
GTMLoggerInfo(@"Socket already disconnected, socket: %@, delegate %@, owner %@", self,
_delegate, _owner);
return;
}
GTMLoggerInfo(@"Disconnect");
[_owner disconnectSocket:self];
}
- (NSString *)description {
return [NSString stringWithFormat:@"<%@: %p, %@, central: %@>", [self class], self,
_connected ? @"connected" : @"not connected",
self.peerIdentifier.UUIDString];
}
- (NSUUID *)peerIdentifier {
return (NSUUID *)[_peer identifier];
}
- (NSUUID *)serviceIdentifier {
return [_owner socketServiceIdentifier:self];
}
#pragma mark - Private
- (instancetype)init {
[self doesNotRecognizeSelector:_cmd];
return nil;
}
- (instancetype)initWithOwner:(id<GNSSocketOwner>)owner
centralPeer:(CBCentral *)centralPeer
queue:(dispatch_queue_t)queue {
return [self initWithOwner:owner peer:centralPeer queue:queue];
}
- (instancetype)initWithOwner:(id<GNSSocketOwner>)owner
peripheralPeer:(CBPeripheral *)peripheralPeer
queue:(dispatch_queue_t)queue {
return [self initWithOwner:owner peer:peripheralPeer queue:queue];
}
- (instancetype)initWithOwner:(id<GNSSocketOwner>)owner
peer:(id)peer
queue:(dispatch_queue_t)queue {
self = [super init];
if (self) {
NSAssert(owner, @"Socket should have an owner.");
NSAssert(peer, @"Socket should have a peer.");
_owner = owner;
_peer = peer;
_queue = queue;
_socketIdentifier = [NSUUID UUID];
_packetSize = kGNSMinSupportedPacketSize;
}
return self;
}
- (void)incrementReceivePacketCounter {
_receivePacketCounter = (_receivePacketCounter + 1) % kGNSMaxPacketCounterValue;
GTMLoggerDebug(@"New receive packet counter %d", _receivePacketCounter);
}
- (void)incrementSendPacketCounter {
_sendPacketCounter = (_sendPacketCounter + 1) % kGNSMaxPacketCounterValue;
GTMLoggerDebug(@"New send packet counter %d", _sendPacketCounter);
}
- (void)didConnect {
_connected = YES;
[_delegate socketDidConnect:self];
}
- (void)didDisconnectWithError:(NSError *)error {
_connected = NO;
_incomingChunkReceivedCallback = nil;
_incomingBuffer = nil;
[_delegate socket:self didDisconnectWithError:error];
}
- (void)didReceiveIncomingWeaveDataPacket:(GNSWeaveDataPacket *)dataPacket {
if (!_connected) {
GTMLoggerError(@"Cannot receive incoming data packet while not being connected");
return;
}
if (dataPacket.isFirstPacket) {
NSAssert(!_incomingBuffer, @"There should not be a receive operation in progress.");
_incomingBuffer = [NSMutableData data];
}
GTMLoggerInfo(@"Received chunk with size %lu", (unsigned long)dataPacket.data.length);
[_incomingBuffer appendData:dataPacket.data];
if (dataPacket.isLastPacket) {
NSData *incomingData = _incomingBuffer;
_incomingBuffer = nil;
GTMLoggerInfo(@"Finished receiving payload with size %lu", (unsigned long)incomingData.length);
[self.delegate socket:self didReceiveData:incomingData];
}
}
- (BOOL)waitingForIncomingData {
return _incomingBuffer != nil;
}
- (CBPeripheral *)peerAsPeripheral {
NSAssert([_peer isKindOfClass:[CBPeripheral class]], @"Wrong peer type %@", _peer);
if ([_peer isKindOfClass:[CBPeripheral class]]) {
return _peer;
} else {
return nil;
}
}
- (CBCentral *)peerAsCentral {
NSAssert([_peer isKindOfClass:[CBCentral class]], @"Wrong peer type %@", _peer);
if ([_peer isKindOfClass:[CBCentral class]]) {
return _peer;
} else {
return nil;
}
}
@end
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