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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 "GRPCHost.h"
#include <grpc/grpc.h>
#import <GRPCClient/GRPCCall.h>
#import <GRPCClient/GRPCCall+ChannelArg.h>
#import "GRPCChannel.h"
#import "GRPCCompletionQueue.h"
#import "NSDictionary+GRPC.h"
NS_ASSUME_NONNULL_BEGIN
// TODO(jcanizales): Generate the version in a standalone header, from templates. Like
// templates/src/core/surface/version.c.template .
#define GRPC_OBJC_VERSION_STRING @"0.13.0"
@implementation GRPCHost {
// TODO(mlumish): Investigate whether caching channels with strong links is a good idea.
GRPCChannel *_channel;
}
+ (nullable instancetype)hostWithAddress:(NSString *)address {
return [[self alloc] initWithAddress:address];
}
// Default initializer.
- (nullable instancetype)initWithAddress:(NSString *)address {
if (!address) {
return nil;
}
// To provide a default port, we try to interpret the address. If it's just a host name without
// scheme and without port, we'll use port 443. If it has a scheme, we pass it untouched to the C
// gRPC library.
// TODO(jcanizales): Add unit tests for the types of addresses we want to let pass untouched.
NSURL *hostURL = [NSURL URLWithString:[@"https://" stringByAppendingString:address]];
if (hostURL.host && !hostURL.port) {
address = [hostURL.host stringByAppendingString:@":443"];
}
// Look up the GRPCHost in the cache.
static NSMutableDictionary *hostCache;
static dispatch_once_t cacheInitialization;
dispatch_once(&cacheInitialization, ^{
hostCache = [NSMutableDictionary dictionary];
});
@synchronized(hostCache) {
GRPCHost *cachedHost = hostCache[address];
if (cachedHost) {
return cachedHost;
}
if ((self = [super init])) {
_address = address;
_secure = YES;
hostCache[address] = self;
}
}
return self;
}
- (nullable grpc_call *)unmanagedCallWithPath:(NSString *)path
completionQueue:(GRPCCompletionQueue *)queue {
GRPCChannel *channel;
// This is racing -[GRPCHost disconnect].
@synchronized(self) {
if (!_channel) {
_channel = [self newChannel];
}
channel = _channel;
}
return [channel unmanagedCallWithPath:path completionQueue:queue];
}
- (NSDictionary *)channelArgs {
NSMutableDictionary *args = [NSMutableDictionary dictionary];
// TODO(jcanizales): Add OS and device information (see
// https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md#user-agents ).
NSString *userAgent = @"grpc-objc/" GRPC_OBJC_VERSION_STRING;
if (_userAgentPrefix) {
userAgent = [_userAgentPrefix stringByAppendingFormat:@" %@", userAgent];
}
args[@GRPC_ARG_PRIMARY_USER_AGENT_STRING] = userAgent;
if (_secure && _hostNameOverride) {
args[@GRPC_SSL_TARGET_NAME_OVERRIDE_ARG] = _hostNameOverride;
}
return args;
}
- (GRPCChannel *)newChannel {
NSDictionary *args = [self channelArgs];
if (_secure) {
return [GRPCChannel secureChannelWithHost:_address
pathToCertificates:_pathToCertificates
channelArgs:args];
} else {
return [GRPCChannel insecureChannelWithHost:_address channelArgs:args];
}
}
- (NSString *)hostName {
// TODO(jcanizales): Default to nil instead of _address when Issue #2635 is clarified.
return _hostNameOverride ?: _address;
}
- (void)disconnect {
// This is racing -[GRPCHost unmanagedCallWithPath:completionQueue:].
@synchronized(self) {
_channel = nil;
}
}
// TODO(jcanizales): Don't let set |secure| to |NO| if |pathToCertificates| or |hostNameOverride|
// have been set. Don't let set either of the latter if |secure| has been set to |NO|.
@end
NS_ASSUME_NONNULL_END
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