examples/objective-c/route_guide/ViewControllers.m - external/github.com/grpc/grpc - Git at Google

 /*
  *
  * Copyright 2015 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  */

 #import <UIKit/UIKit.h>
 #import <RouteGuide/RouteGuide.pbrpc.h>

 static NSString * const kHostAddress = @"localhost:50051";

 /** Category to override RTGPoint's description. */
 @interface RTGPoint (Description)
 - (NSString *)description;
 @end

 @implementation RTGPoint (Description)
 - (NSString *)description {
   NSString *verticalDirection = self.latitude >= 0 ? @"N" : @"S";
   NSString *horizontalDirection = self.longitude >= 0 ? @"E" : @"W";
   return [NSString stringWithFormat:@"%.02f%@ %.02f%@",
           abs(self.latitude) / 1E7f, verticalDirection,
           abs(self.longitude) / 1E7f, horizontalDirection];
 }
 @end

 /** Category to give RTGRouteNote a convenience constructor. */
 @interface RTGRouteNote (Constructors)
 + (instancetype)noteWithMessage:(NSString *)message
                        latitude:(float)latitude
                       longitude:(float)longitude;
 @end

 @implementation RTGRouteNote (Constructors)
 + (instancetype)noteWithMessage:(NSString *)message
                        latitude:(float)latitude
                       longitude:(float)longitude {
   RTGRouteNote *note = [self message];
   note.message = message;
   note.location.latitude = (int32_t) latitude * 1E7;
   note.location.longitude = (int32_t) longitude * 1E7;
   return note;
 }
 @end


 #pragma mark Demo: Get Feature

 /**
  * Run the getFeature demo. Calls getFeature with a point known to have a feature and a point known
  * not to have a feature.
  */
 @interface GetFeatureViewController : UIViewController<GRPCProtoResponseHandler>

 @property (weak, nonatomic) IBOutlet UILabel *outputLabel;

 @end

 @implementation GetFeatureViewController {
   RTGRouteGuide *_service;
 }

 - (dispatch_queue_t)dispatchQueue {
   return dispatch_get_main_queue();
 }

 - (void)didReceiveProtoMessage:(GPBMessage *)message {
   RTGFeature *response = (RTGFeature *)message;

   // TODO(makdharma): Remove boilerplate by consolidating into one log function.
   if (response.name.length != 0) {
     NSString *str =[NSString stringWithFormat:@"%@\nFound feature called %@ at %@.", self.outputLabel.text, response.location, response.name];
     self.outputLabel.text = str;
     NSLog(@"Found feature called %@ at %@.", response.name, response.location);
   } else if (response) {
     NSString *str =[NSString stringWithFormat:@"%@\nFound no features at %@",  self.outputLabel.text,response.location];
     self.outputLabel.text = str;
     NSLog(@"Found no features at %@", response.location);
   }
 }

 - (void)didCloseWithTrailingMetadata:(NSDictionary *)trailingMetadata error:(NSError *)error {
   if (error) {
     NSString *str =[NSString stringWithFormat:@"%@\nRPC error: %@", self.outputLabel.text, error];
     self.outputLabel.text = str;
     NSLog(@"RPC error: %@", error);
   }
 }

 - (void)execRequest {
   RTGPoint *point = [RTGPoint message];
   point.latitude = 409146138;
   point.longitude = -746188906;

   GRPCUnaryProtoCall *call = [_service getFeatureWithMessage:point
                                              responseHandler:self
                                                  callOptions:nil];
   [call start];
   call = [_service getFeatureWithMessage:[RTGPoint message]
                          responseHandler:self
                              callOptions:nil];
   [call start];

 }

 - (void)viewDidLoad {
   [super viewDidLoad];

   GRPCMutableCallOptions *options = [[GRPCMutableCallOptions alloc] init];
   options.transportType = GRPCTransportTypeInsecure;

   _service = [[RTGRouteGuide alloc] initWithHost:kHostAddress callOptions:options];
 }

 - (void)viewDidAppear:(BOOL)animated {
   self.outputLabel.text = @"RPC log:";
   self.outputLabel.numberOfLines = 0;
   self.outputLabel.font = [UIFont fontWithName:@"Helvetica Neue" size:8.0];
   [self execRequest];
 }

 @end


 #pragma mark Demo: List Features

 /**
  * Run the listFeatures demo. Calls listFeatures with a rectangle containing all of the features in
  * the pre-generated database. Prints each response as it comes in.
  */
 @interface ListFeaturesViewController : UIViewController<GRPCProtoResponseHandler>

 @property (weak, nonatomic) IBOutlet UILabel *outputLabel;

 @end

 @implementation ListFeaturesViewController {
   RTGRouteGuide *_service;
 }

 - (dispatch_queue_t)dispatchQueue {
   return dispatch_get_main_queue();
 }

 - (void)execRequest {
   RTGRectangle *rectangle = [RTGRectangle message];
   rectangle.lo.latitude = 405E6;
   rectangle.lo.longitude = -750E6;
   rectangle.hi.latitude = 410E6;
   rectangle.hi.longitude = -745E6;

   NSLog(@"Looking for features between %@ and %@", rectangle.lo, rectangle.hi);
   GRPCUnaryProtoCall *call = [_service listFeaturesWithMessage:rectangle
                                                responseHandler:self
                                                    callOptions:nil];
   [call start];
 }

 - (void)didReceiveProtoMessage:(GPBMessage *)message {
   RTGFeature *response = (RTGFeature *)message;
   if (response) {
     NSString *str =[NSString stringWithFormat:@"%@\nFound feature at %@ called %@.", self.outputLabel.text, response.location, response.name];
     self.outputLabel.text = str;
     NSLog(@"Found feature at %@ called %@.", response.location, response.name);
   }
 }

 - (void)didCloseWithTrailingMetadata:(NSDictionary *)trailingMetadata error:(NSError *)error {
   if (error) {
     NSString *str =[NSString stringWithFormat:@"%@\nRPC error: %@", self.outputLabel.text, error];
     self.outputLabel.text = str;
     NSLog(@"RPC error: %@", error);
   }
 }

 - (void)viewDidLoad {
   [super viewDidLoad];

   GRPCMutableCallOptions *options = [[GRPCMutableCallOptions alloc] init];
   options.transportType = GRPCTransportTypeInsecure;

   _service = [[RTGRouteGuide alloc] initWithHost:kHostAddress callOptions:options];
 }

 - (void)viewDidAppear:(BOOL)animated {
   self.outputLabel.text = @"RPC log:";
   self.outputLabel.numberOfLines = 0;
   self.outputLabel.font = [UIFont fontWithName:@"Helvetica Neue" size:8.0];
   [self execRequest];
 }

 @end

 #pragma mark Demo: Record Route

 /**
  * Run the recordRoute demo. Sends several randomly chosen points from the pre-generated feature
  * database with a variable delay in between. Prints the statistics when they are sent from the
  * server.
  */
 @interface RecordRouteViewController : UIViewController<GRPCProtoResponseHandler>

 @property (weak, nonatomic) IBOutlet UILabel *outputLabel;

 @end

 @implementation RecordRouteViewController {
   RTGRouteGuide *_service;
 }

 - (dispatch_queue_t)dispatchQueue {
   return dispatch_get_main_queue();
 }

 - (void)execRequest {
   NSString *dataBasePath = [NSBundle.mainBundle pathForResource:@"route_guide_db"
                                                          ofType:@"json"];
   NSData *dataBaseContent = [NSData dataWithContentsOfFile:dataBasePath];
   NSError *error;
   NSArray *features = [NSJSONSerialization JSONObjectWithData:dataBaseContent options:0 error:&error];

   if (error) {
     NSLog(@"Error reading database.");
     NSString *str = @"Error reading database.";
     self.outputLabel.text = str;
     return;
   }

   GRPCStreamingProtoCall *call = [_service recordRouteWithResponseHandler:self
                                                               callOptions:nil];
   [call start];
   for (id feature in features) {
     RTGPoint *location = [RTGPoint message];
     location.longitude = [((NSNumber *) feature[@"location"][@"longitude"]) intValue];
     location.latitude = [((NSNumber *) feature[@"location"][@"latitude"]) intValue];
     NSString *str =[NSString stringWithFormat:@"%@\nVisiting point %@", self.outputLabel.text, location];
     self.outputLabel.text = str;
     NSLog(@"Visiting point %@", location);
     [call writeMessage:location];
   }
   [call finish];
 }

 - (void)didReceiveProtoMessage:(GPBMessage *)message {
   RTGRouteSummary *response = (RTGRouteSummary *)message;

   if (response) {
     NSString *str =[NSString stringWithFormat:
                     @"%@\nFinished trip with %i points\nPassed %i features\n"
                     "Travelled %i meters\nIt took %i seconds",
                     self.outputLabel.text, response.pointCount, response.featureCount,
                     response.distance, response.elapsedTime];
     self.outputLabel.text = str;
     NSLog(@"Finished trip with %i points", response.pointCount);
     NSLog(@"Passed %i features", response.featureCount);
     NSLog(@"Travelled %i meters", response.distance);
     NSLog(@"It took %i seconds", response.elapsedTime);
   }
 }

 - (void)didCloseWithTrailingMetadata:(NSDictionary *)trailingMetadata error:(NSError *)error {
   if (error) {
     NSString *str =[NSString stringWithFormat:@"%@\nRPC error: %@", self.outputLabel.text, error];
     self.outputLabel.text = str;
     NSLog(@"RPC error: %@", error);
   }
 }

 - (void)viewDidLoad {
   [super viewDidLoad];

   GRPCMutableCallOptions *options = [[GRPCMutableCallOptions alloc] init];
   options.transportType = GRPCTransportTypeInsecure;

   _service = [[RTGRouteGuide alloc] initWithHost:kHostAddress callOptions:options];
 }

 - (void)viewDidAppear:(BOOL)animated {
   self.outputLabel.text = @"RPC log:";
   self.outputLabel.numberOfLines = 0;
   self.outputLabel.font = [UIFont fontWithName:@"Helvetica Neue" size:8.0];
   [self execRequest];
 }

 @end


 #pragma mark Demo: Route Chat

 /**
  * Run the routeChat demo. Send some chat messages, and print any chat messages that are sent from
  * the server.
  */
 @interface RouteChatViewController : UIViewController<GRPCProtoResponseHandler>

 @property (weak, nonatomic) IBOutlet UILabel *outputLabel;

 @end

 @implementation RouteChatViewController {
   RTGRouteGuide *_service;
 }

 - (dispatch_queue_t)dispatchQueue {
   return dispatch_get_main_queue();
 }

 - (void)execRequest {
   NSArray *notes = @[[RTGRouteNote noteWithMessage:@"First message" latitude:0 longitude:0],
                      [RTGRouteNote noteWithMessage:@"Second message" latitude:0 longitude:1],
                      [RTGRouteNote noteWithMessage:@"Third message" latitude:1 longitude:0],
                      [RTGRouteNote noteWithMessage:@"Fourth message" latitude:0 longitude:0]];

   GRPCStreamingProtoCall *call = [_service routeChatWithResponseHandler:self
                                                             callOptions:nil];
   [call start];
   for (RTGRouteNote *note in notes) {
     [call writeMessage:note];
   }
   [call finish];
 }

 - (void)didReceiveProtoMessage:(GPBMessage *)message {
   RTGRouteNote *note = (RTGRouteNote *)message;
   if (note) {
     NSString *str =[NSString stringWithFormat:@"%@\nGot message %@ at %@",
                     self.outputLabel.text, note.message, note.location];
     self.outputLabel.text = str;
     NSLog(@"Got message %@ at %@", note.message, note.location);
   }
 }

 - (void)didCloseWithTrailingMetadata:(NSDictionary *)trailingMetadata error:(NSError *)error {
   if (!error) {
     NSLog(@"Chat ended.");
   } else {
     NSString *str =[NSString stringWithFormat:@"%@\nRPC error: %@", self.outputLabel.text, error];
     self.outputLabel.text = str;
     NSLog(@"RPC error: %@", error);
   }
 }

 - (void)viewDidLoad {
   [super viewDidLoad];

   GRPCMutableCallOptions *options = [[GRPCMutableCallOptions alloc] init];
   options.transportType = GRPCTransportTypeInsecure;

   _service = [[RTGRouteGuide alloc] initWithHost:kHostAddress callOptions:options];
 }

 - (void)viewDidAppear:(BOOL)animated {
   // TODO(makarandd): Set these properties through UI builder
   self.outputLabel.text = @"RPC log:";
   self.outputLabel.numberOfLines = 0;
   self.outputLabel.font = [UIFont fontWithName:@"Helvetica Neue" size:8.0];
   [self execRequest];
 }

 @end
	/*
	*
	* Copyright 2015 gRPC authors.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*
	*/

	#import <UIKit/UIKit.h>
	#import <RouteGuide/RouteGuide.pbrpc.h>

	static NSString * const kHostAddress = @"localhost:50051";

	/** Category to override RTGPoint's description. */
	@interface RTGPoint (Description)
	- (NSString *)description;
	@end

	@implementation RTGPoint (Description)
	- (NSString *)description {
	NSString *verticalDirection = self.latitude >= 0 ? @"N" : @"S";
	NSString *horizontalDirection = self.longitude >= 0 ? @"E" : @"W";
	return [NSString stringWithFormat:@"%.02f%@ %.02f%@",
	abs(self.latitude) / 1E7f, verticalDirection,
	abs(self.longitude) / 1E7f, horizontalDirection];
	}
	@end

	/** Category to give RTGRouteNote a convenience constructor. */
	@interface RTGRouteNote (Constructors)
	+ (instancetype)noteWithMessage:(NSString *)message
	latitude:(float)latitude
	longitude:(float)longitude;
	@end

	@implementation RTGRouteNote (Constructors)
	+ (instancetype)noteWithMessage:(NSString *)message
	latitude:(float)latitude
	longitude:(float)longitude {
	RTGRouteNote *note = [self message];
	note.message = message;
	note.location.latitude = (int32_t) latitude * 1E7;
	note.location.longitude = (int32_t) longitude * 1E7;
	return note;
	}
	@end


	#pragma mark Demo: Get Feature

	/**
	* Run the getFeature demo. Calls getFeature with a point known to have a feature and a point known
	* not to have a feature.
	*/
	@interface GetFeatureViewController : UIViewController<GRPCProtoResponseHandler>

	@property (weak, nonatomic) IBOutlet UILabel *outputLabel;

	@end

	@implementation GetFeatureViewController {
	RTGRouteGuide *_service;
	}

	- (dispatch_queue_t)dispatchQueue {
	return dispatch_get_main_queue();
	}

	- (void)didReceiveProtoMessage:(GPBMessage *)message {
	RTGFeature response = (RTGFeature )message;

	// TODO(makdharma): Remove boilerplate by consolidating into one log function.
	if (response.name.length != 0) {
	NSString *str =[NSString stringWithFormat:@"%@\nFound feature called %@ at %@.", self.outputLabel.text, response.location, response.name];
	self.outputLabel.text = str;
	NSLog(@"Found feature called %@ at %@.", response.name, response.location);
	} else if (response) {
	NSString *str =[NSString stringWithFormat:@"%@\nFound no features at %@", self.outputLabel.text,response.location];
	self.outputLabel.text = str;
	NSLog(@"Found no features at %@", response.location);
	}
	}

	- (void)didCloseWithTrailingMetadata:(NSDictionary )trailingMetadata error:(NSError )error {
	if (error) {
	NSString *str =[NSString stringWithFormat:@"%@\nRPC error: %@", self.outputLabel.text, error];
	self.outputLabel.text = str;
	NSLog(@"RPC error: %@", error);
	}
	}

	- (void)execRequest {
	RTGPoint *point = [RTGPoint message];
	point.latitude = 409146138;
	point.longitude = -746188906;

	GRPCUnaryProtoCall *call = [_service getFeatureWithMessage:point
	responseHandler:self
	callOptions:nil];
	[call start];
	call = [_service getFeatureWithMessage:[RTGPoint message]
	responseHandler:self
	callOptions:nil];
	[call start];

	}

	- (void)viewDidLoad {
	[super viewDidLoad];

	GRPCMutableCallOptions *options = [[GRPCMutableCallOptions alloc] init];
	options.transportType = GRPCTransportTypeInsecure;

	_service = [[RTGRouteGuide alloc] initWithHost:kHostAddress callOptions:options];
	}

	- (void)viewDidAppear:(BOOL)animated {
	self.outputLabel.text = @"RPC log:";
	self.outputLabel.numberOfLines = 0;
	self.outputLabel.font = [UIFont fontWithName:@"Helvetica Neue" size:8.0];
	[self execRequest];
	}

	@end


	#pragma mark Demo: List Features

	/**
	* Run the listFeatures demo. Calls listFeatures with a rectangle containing all of the features in
	* the pre-generated database. Prints each response as it comes in.
	*/
	@interface ListFeaturesViewController : UIViewController<GRPCProtoResponseHandler>

	@property (weak, nonatomic) IBOutlet UILabel *outputLabel;

	@end

	@implementation ListFeaturesViewController {
	RTGRouteGuide *_service;
	}

	- (dispatch_queue_t)dispatchQueue {
	return dispatch_get_main_queue();
	}

	- (void)execRequest {
	RTGRectangle *rectangle = [RTGRectangle message];
	rectangle.lo.latitude = 405E6;
	rectangle.lo.longitude = -750E6;
	rectangle.hi.latitude = 410E6;
	rectangle.hi.longitude = -745E6;

	NSLog(@"Looking for features between %@ and %@", rectangle.lo, rectangle.hi);
	GRPCUnaryProtoCall *call = [_service listFeaturesWithMessage:rectangle
	responseHandler:self
	callOptions:nil];
	[call start];
	}

	- (void)didReceiveProtoMessage:(GPBMessage *)message {
	RTGFeature response = (RTGFeature )message;
	if (response) {
	NSString *str =[NSString stringWithFormat:@"%@\nFound feature at %@ called %@.", self.outputLabel.text, response.location, response.name];
	self.outputLabel.text = str;
	NSLog(@"Found feature at %@ called %@.", response.location, response.name);
	}
	}

	- (void)didCloseWithTrailingMetadata:(NSDictionary )trailingMetadata error:(NSError )error {
	if (error) {
	NSString *str =[NSString stringWithFormat:@"%@\nRPC error: %@", self.outputLabel.text, error];
	self.outputLabel.text = str;
	NSLog(@"RPC error: %@", error);
	}
	}

	- (void)viewDidLoad {
	[super viewDidLoad];

	GRPCMutableCallOptions *options = [[GRPCMutableCallOptions alloc] init];
	options.transportType = GRPCTransportTypeInsecure;

	_service = [[RTGRouteGuide alloc] initWithHost:kHostAddress callOptions:options];
	}

	- (void)viewDidAppear:(BOOL)animated {
	self.outputLabel.text = @"RPC log:";
	self.outputLabel.numberOfLines = 0;
	self.outputLabel.font = [UIFont fontWithName:@"Helvetica Neue" size:8.0];
	[self execRequest];
	}

	@end

	#pragma mark Demo: Record Route

	/**
	* Run the recordRoute demo. Sends several randomly chosen points from the pre-generated feature
	* database with a variable delay in between. Prints the statistics when they are sent from the
	* server.
	*/
	@interface RecordRouteViewController : UIViewController<GRPCProtoResponseHandler>

	@property (weak, nonatomic) IBOutlet UILabel *outputLabel;

	@end

	@implementation RecordRouteViewController {
	RTGRouteGuide *_service;
	}

	- (dispatch_queue_t)dispatchQueue {
	return dispatch_get_main_queue();
	}

	- (void)execRequest {
	NSString *dataBasePath = [NSBundle.mainBundle pathForResource:@"route_guide_db"
	ofType:@"json"];
	NSData *dataBaseContent = [NSData dataWithContentsOfFile:dataBasePath];
	NSError *error;
	NSArray *features = [NSJSONSerialization JSONObjectWithData:dataBaseContent options:0 error:&error];

	if (error) {
	NSLog(@"Error reading database.");
	NSString *str = @"Error reading database.";
	self.outputLabel.text = str;
	return;
	}

	GRPCStreamingProtoCall *call = [_service recordRouteWithResponseHandler:self
	callOptions:nil];
	[call start];
	for (id feature in features) {
	RTGPoint *location = [RTGPoint message];
	location.longitude = [((NSNumber *) feature[@"location"][@"longitude"]) intValue];
	location.latitude = [((NSNumber *) feature[@"location"][@"latitude"]) intValue];
	NSString *str =[NSString stringWithFormat:@"%@\nVisiting point %@", self.outputLabel.text, location];
	self.outputLabel.text = str;
	NSLog(@"Visiting point %@", location);
	[call writeMessage:location];
	}
	[call finish];
	}

	- (void)didReceiveProtoMessage:(GPBMessage *)message {
	RTGRouteSummary response = (RTGRouteSummary )message;

	if (response) {
	NSString *str =[NSString stringWithFormat:
	@"%@\nFinished trip with %i points\nPassed %i features\n"
	"Travelled %i meters\nIt took %i seconds",
	self.outputLabel.text, response.pointCount, response.featureCount,
	response.distance, response.elapsedTime];
	self.outputLabel.text = str;
	NSLog(@"Finished trip with %i points", response.pointCount);
	NSLog(@"Passed %i features", response.featureCount);
	NSLog(@"Travelled %i meters", response.distance);
	NSLog(@"It took %i seconds", response.elapsedTime);
	}
	}

	- (void)didCloseWithTrailingMetadata:(NSDictionary )trailingMetadata error:(NSError )error {
	if (error) {
	NSString *str =[NSString stringWithFormat:@"%@\nRPC error: %@", self.outputLabel.text, error];
	self.outputLabel.text = str;
	NSLog(@"RPC error: %@", error);
	}
	}

	- (void)viewDidLoad {
	[super viewDidLoad];

	GRPCMutableCallOptions *options = [[GRPCMutableCallOptions alloc] init];
	options.transportType = GRPCTransportTypeInsecure;

	_service = [[RTGRouteGuide alloc] initWithHost:kHostAddress callOptions:options];
	}

	- (void)viewDidAppear:(BOOL)animated {
	self.outputLabel.text = @"RPC log:";
	self.outputLabel.numberOfLines = 0;
	self.outputLabel.font = [UIFont fontWithName:@"Helvetica Neue" size:8.0];
	[self execRequest];
	}

	@end


	#pragma mark Demo: Route Chat

	/**
	* Run the routeChat demo. Send some chat messages, and print any chat messages that are sent from
	* the server.
	*/
	@interface RouteChatViewController : UIViewController<GRPCProtoResponseHandler>

	@property (weak, nonatomic) IBOutlet UILabel *outputLabel;

	@end

	@implementation RouteChatViewController {
	RTGRouteGuide *_service;
	}

	- (dispatch_queue_t)dispatchQueue {
	return dispatch_get_main_queue();
	}

	- (void)execRequest {
	NSArray *notes = @[[RTGRouteNote noteWithMessage:@"First message" latitude:0 longitude:0],
	[RTGRouteNote noteWithMessage:@"Second message" latitude:0 longitude:1],
	[RTGRouteNote noteWithMessage:@"Third message" latitude:1 longitude:0],
	[RTGRouteNote noteWithMessage:@"Fourth message" latitude:0 longitude:0]];

	GRPCStreamingProtoCall *call = [_service routeChatWithResponseHandler:self
	callOptions:nil];
	[call start];
	for (RTGRouteNote *note in notes) {
	[call writeMessage:note];
	}
	[call finish];
	}

	- (void)didReceiveProtoMessage:(GPBMessage *)message {
	RTGRouteNote note = (RTGRouteNote )message;
	if (note) {
	NSString *str =[NSString stringWithFormat:@"%@\nGot message %@ at %@",
	self.outputLabel.text, note.message, note.location];
	self.outputLabel.text = str;
	NSLog(@"Got message %@ at %@", note.message, note.location);
	}
	}

	- (void)didCloseWithTrailingMetadata:(NSDictionary )trailingMetadata error:(NSError )error {
	if (!error) {
	NSLog(@"Chat ended.");
	} else {
	NSString *str =[NSString stringWithFormat:@"%@\nRPC error: %@", self.outputLabel.text, error];
	self.outputLabel.text = str;
	NSLog(@"RPC error: %@", error);
	}
	}

	- (void)viewDidLoad {
	[super viewDidLoad];

	GRPCMutableCallOptions *options = [[GRPCMutableCallOptions alloc] init];
	options.transportType = GRPCTransportTypeInsecure;

	_service = [[RTGRouteGuide alloc] initWithHost:kHostAddress callOptions:options];
	}

	- (void)viewDidAppear:(BOOL)animated {
	// TODO(makarandd): Set these properties through UI builder
	self.outputLabel.text = @"RPC log:";
	self.outputLabel.numberOfLines = 0;
	self.outputLabel.font = [UIFont fontWithName:@"Helvetica Neue" size:8.0];
	[self execRequest];
	}

	@end