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				|  |  | +/*
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				|  |  | + *
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				|  |  | + * Copyright 2015, Google Inc.
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				|  |  | + * All rights reserved.
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				|  |  | + *
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				|  |  | + * Redistribution and use in source and binary forms, with or without
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				|  |  | + * modification, are permitted provided that the following conditions are
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				|  |  | + * met:
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				|  |  | + *
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				|  |  | + *     * Redistributions of source code must retain the above copyright
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				|  |  | + * notice, this list of conditions and the following disclaimer.
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				|  |  | + *     * Redistributions in binary form must reproduce the above
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				|  |  | + * copyright notice, this list of conditions and the following disclaimer
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				|  |  | + * in the documentation and/or other materials provided with the
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				|  |  | + * distribution.
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				|  |  | + *     * Neither the name of Google Inc. nor the names of its
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				|  |  | + * contributors may be used to endorse or promote products derived from
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				|  |  | + * this software without specific prior written permission.
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				|  |  | + *
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				|  |  | + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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				|  |  | + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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				|  |  | + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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				|  |  | + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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				|  |  | + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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				|  |  | + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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				|  |  | + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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				|  |  | + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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				|  |  | + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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				|  |  | + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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				|  |  | + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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				|  |  | + *
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				|  |  | + */
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				|  |  | +
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				|  |  | +#import "GRPCHost.h"
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				|  |  | +
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				|  |  | +#import "GRPCChannel.h"
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				|  |  | +#import "GRPCSecureChannel.h"
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				|  |  | +#import "GRPCUnsecuredChannel.h"
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				|  |  | +
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				|  |  | +@interface GRPCHost ()
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				|  |  | +// TODO(mlumish): Investigate whether a caching channels with strong links is a good idea.
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				|  |  | +@property(nonatomic, strong) GRPCChannel *channel;
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				|  |  | +@end
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				|  |  | +
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				|  |  | +@implementation GRPCHost
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				|  |  | +
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				|  |  | ++ (instancetype)hostWithAddress:(NSString *)address {
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				|  |  | +  return [[self alloc] initWithAddress:address];
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				|  |  | +}
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				|  |  | +
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				|  |  | +- (instancetype)init {
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				|  |  | +  return [self initWithAddress:nil];
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				|  |  | +}
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				|  |  | +
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				|  |  | +// Default initializer.
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				|  |  | +- (instancetype)initWithAddress:(NSString *)address {
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				|  |  | +
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				|  |  | +  // Verify and normalize the address, and decide whether to use SSL.
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				|  |  | +  if (![address rangeOfString:@"://"].length) {
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				|  |  | +    // No scheme provided; assume https.
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				|  |  | +    address = [@"https://" stringByAppendingString:address];
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				|  |  | +  }
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				|  |  | +  NSURL *hostURL = [NSURL URLWithString:address];
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				|  |  | +  if (!hostURL) {
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				|  |  | +    [NSException raise:NSInvalidArgumentException format:@"Invalid URL: %@", address];
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				|  |  | +  }
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				|  |  | +  NSString *scheme = hostURL.scheme;
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				|  |  | +  if (![scheme isEqualToString:@"https"] && ![scheme isEqualToString:@"http"]) {
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				|  |  | +    [NSException raise:NSInvalidArgumentException format:@"URL scheme %@ isn't supported.", scheme];
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				|  |  | +  }
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				|  |  | +  NSNumber *port = hostURL.port ?: [scheme isEqualToString:@"https"] ? @443 : @80;
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				|  |  | +  address = [@[hostURL.host, port] componentsJoinedByString:@":"];
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				|  |  | +
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				|  |  | +  // Look up the GRPCHost in the cache.
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				|  |  | +  // TODO(jcanizales): Make this cache thread-safe.
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				|  |  | +  static NSMutableDictionary *hostCache;
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				|  |  | +  static dispatch_once_t cacheInitialization;
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				|  |  | +  dispatch_once(&cacheInitialization, ^{
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				|  |  | +    hostCache = [NSMutableDictionary dictionary];
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				|  |  | +  });
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				|  |  | +  if (hostCache[address]) {
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				|  |  | +    // We could verify here that the cached host uses the same protocol that we're expecting. But
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				|  |  | +    // picking HTTP by adding the scheme to the address is going away (to make the use of insecure
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				|  |  | +    // channels less subtle), so it's not worth it now.
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				|  |  | +    return hostCache[address];
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				|  |  | +  }
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				|  |  | +
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				|  |  | +  if ((self = [super init])) {
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				|  |  | +    _address = address;
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				|  |  | +    _secure = [scheme isEqualToString:@"https"];
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				|  |  | +    hostCache[address] = self;
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				|  |  | +  }
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				|  |  | +  return self;
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				|  |  | +}
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				|  |  | +
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				|  |  | +- (grpc_call *)unmanagedCallWithPath:(NSString *)path completionQueue:(GRPCCompletionQueue *)queue {
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				|  |  | +  if (!queue || !path) {
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				|  |  | +    return NULL;
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				|  |  | +  }
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				|  |  | +  return grpc_channel_create_call(self.channel.unmanagedChannel,
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				|  |  | +                                  queue.unmanagedQueue,
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				|  |  | +                                  path.UTF8String,
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				|  |  | +                                  self.hostName.UTF8String,
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				|  |  | +                                  gpr_inf_future(GPR_CLOCK_REALTIME));
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				|  |  | +}
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				|  |  | +
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				|  |  | +- (GRPCChannel *)channel {
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				|  |  | +  // Create it lazily.
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				|  |  | +  if (!_channel) {
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				|  |  | +    if (_secure) {
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				|  |  | +      _channel = [[GRPCSecureChannel alloc] initWithHost:_address
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				|  |  | +                                      pathToCertificates:_pathToCertificates
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				|  |  | +                                        hostNameOverride:_hostNameOverride];
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				|  |  | +    } else {
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				|  |  | +      _channel = [[GRPCUnsecuredChannel alloc] initWithHost:_address];
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				|  |  | +    }
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				|  |  | +  }
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				|  |  | +  return _channel;
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				|  |  | +}
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				|  |  | +
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				|  |  | +- (NSString *)hostName {
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				|  |  | +  // TODO(jcanizales): Default to nil instead of _address when Issue #2635 is clarified.
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				|  |  | +  return _hostNameOverride ?: _address;
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				|  |  | +}
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				|  |  | +
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				|  |  | +@end
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