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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 "GRPCChannel.h"
#include <grpc/grpc.h>
#import "GRPCSecureChannel.h"
#import "GRPCUnsecuredChannel.h"
@implementation GRPCChannel
+ (instancetype)channelToHost:(NSString *)host {
// TODO(mlumish): Investigate whether a cache with strong links is a good idea
static NSMutableDictionary *channelCache;
static dispatch_once_t cacheInitialization;
dispatch_once(&cacheInitialization, ^{
channelCache = [NSMutableDictionary dictionary];
});
GRPCChannel *channel = channelCache[host];
if (!channel) {
channel = [[self alloc] initWithHost:host];
channelCache[host] = channel;
}
return channel;
}
- (instancetype)init {
return [self initWithHost:nil];
}
- (instancetype)initWithHost:(NSString *)host {
if (![host rangeOfString:@"://"].length) {
// No scheme provided; assume https.
host = [@"https://" stringByAppendingString:host];
}
NSURL *hostURL = [NSURL URLWithString:host];
if (!hostURL) {
[NSException raise:NSInvalidArgumentException format:@"Invalid URL: %@", host];
}
if ([hostURL.scheme isEqualToString:@"https"]) {
host = [@[hostURL.host, hostURL.port ?: @443] componentsJoinedByString:@":"];
return [[GRPCSecureChannel alloc] initWithHost:host];
}
if ([hostURL.scheme isEqualToString:@"http"]) {
host = [@[hostURL.host, hostURL.port ?: @80] componentsJoinedByString:@":"];
return [[GRPCUnsecuredChannel alloc] initWithHost:host];
}
[NSException raise:NSInvalidArgumentException
format:@"URL scheme %@ isn't supported.", hostURL.scheme];
return nil; // silence warning.
}
- (instancetype)initWithChannel:(struct grpc_channel *)unmanagedChannel {
if ((self = [super init])) {
_unmanagedChannel = unmanagedChannel;
}
return self;
}
- (void)dealloc {
// _unmanagedChannel is NULL when deallocating an object of the base class (because the
// initializer returns a different object).
if (_unmanagedChannel) {
// TODO(jcanizales): Be sure to add a test with a server that closes the connection prematurely,
// as in the past that made this call to crash.
grpc_channel_destroy(_unmanagedChannel);
}
}
@end
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