src/objective-c/GRPCClient/private/GRPCChannel.m

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 *
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#import "GRPCChannel.h"

#include <grpc/grpc.h>

#import "GRPCSecureChannel.h"
#import "GRPCUnsecuredChannel.h"

@implementation GRPCChannel

+ (instancetype)channelToHost:(NSString *)host {
  // TODO(jcanizales): Reuse channels.
  return [[self alloc] initWithHost:host];
}

- (instancetype)init {
  return [self initWithHost:nil];
}

- (instancetype)initWithHost:(NSString *)host {
  if (![host containsString:@"://"]) {
    // 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