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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 "GRPCChannel.h"
#import "GRPCCompletionQueue.h"
#import "GRPCSecureChannel.h"
#import "GRPCUnsecuredChannel.h"
@interface GRPCHost ()
// TODO(mlumish): Investigate whether caching channels with strong links is a good idea.
@property(nonatomic, strong) GRPCChannel *channel;
@end
@implementation GRPCHost
+ (instancetype)hostWithAddress:(NSString *)address {
return [[self alloc] initWithAddress:address];
}
- (instancetype)init {
return [self initWithAddress:nil];
}
// Default initializer.
- (instancetype)initWithAddress:(NSString *)address {
// Verify and normalize the address, and decide whether to use SSL.
if (![address rangeOfString:@"://"].length) {
// No scheme provided; assume https.
address = [@"https://" stringByAppendingString:address];
}
NSURL *hostURL = [NSURL URLWithString:address];
if (!hostURL) {
[NSException raise:NSInvalidArgumentException format:@"Invalid URL: %@", address];
}
NSString *scheme = hostURL.scheme;
if (![scheme isEqualToString:@"https"] && ![scheme isEqualToString:@"http"]) {
[NSException raise:NSInvalidArgumentException format:@"URL scheme %@ isn't supported.", scheme];
}
// If the user didn't specify a port (hostURL.port is nil), provide a default one.
NSNumber *port = hostURL.port ?: [scheme isEqualToString:@"https"] ? @443 : @80;
address = [@[hostURL.host, port] componentsJoinedByString:@":"];
// 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) {
// We could verify here that the cached host uses the same protocol that we're expecting. But
// creating non-SSL channels by adding "http://" to the address is going away (to make the use
// of insecure channels less subtle), so it's not worth it now.
return cachedHost;
}
if ((self = [super init])) {
_address = address;
_secure = [scheme isEqualToString:@"https"];
hostCache[address] = self;
}
return self;
}
}
- (grpc_call *)unmanagedCallWithPath:(NSString *)path completionQueue:(GRPCCompletionQueue *)queue {
if (!queue || !path || !self.channel) {
return NULL;
}
return grpc_channel_create_call(self.channel.unmanagedChannel,
NULL, GRPC_PROPAGATE_DEFAULTS,
queue.unmanagedQueue,
path.UTF8String,
self.hostName.UTF8String,
gpr_inf_future(GPR_CLOCK_REALTIME));
}
- (GRPCChannel *)channel {
// Create it lazily, because we don't want to open a connection just because someone is
// configuring a host.
if (!_channel) {
if (_secure) {
_channel = [[GRPCSecureChannel alloc] initWithHost:_address
pathToCertificates:_pathToCertificates
hostNameOverride:_hostNameOverride];
} else {
_channel = [[GRPCUnsecuredChannel alloc] initWithHost:_address];
}
}
return _channel;
}
- (NSString *)hostName {
// TODO(jcanizales): Default to nil instead of _address when Issue #2635 is clarified.
return _hostNameOverride ?: _address;
}
@end
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