grpc/examples/objective-c/route_guide/ViewControllers.m

/*
 *
 * Copyright 2015, Google Inc.
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 * modification, are permitted provided that the following conditions are
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 *
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 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * 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
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#import <UIKit/UIKit.h>
#import <RouteGuide/RouteGuide.pbrpc.h>
#import <RxLibrary/GRXWriter+Immediate.h>
#import <RxLibrary/GRXWriter+Transformations.h>

static NSString * const kHostAddress = @"http://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
@end

@implementation GetFeatureViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  RTGRouteGuide *client = [[RTGRouteGuide alloc] initWithHost:kHostAddress];

  void (^handler)(RTGFeature *response, NSError *error) = ^(RTGFeature *response, NSError *error) {
    if (response.name.length) {
      NSLog(@"Found feature called %@ at %@.", response.name, response.location);
    } else if (response) {
      NSLog(@"Found no features at %@", response.location);
    } else {
      NSLog(@"RPC error: %@", error);
    }
  };

  RTGPoint *point = [RTGPoint message];
  point.latitude = 409146138;
  point.longitude = -746188906;

  [client getFeatureWithRequest:point handler:handler];
  [client getFeatureWithRequest:[RTGPoint message] handler:handler];
}

@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
@end

@implementation ListFeaturesViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  RTGRouteGuide *client = [[RTGRouteGuide alloc] initWithHost:kHostAddress];

  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);
  [client listFeaturesWithRequest:rectangle
                     eventHandler:^(BOOL done, RTGFeature *response, NSError *error) {
    if (response) {
      NSLog(@"Found feature at %@ called %@.", response.location, response.name);
    } else if (error) {
      NSLog(@"RPC error: %@", error);
    }
  }];
}

@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
@end

@implementation RecordRouteViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  NSString *dataBasePath = [NSBundle.mainBundle pathForResource:@"route_guide_db"
                                                         ofType:@"json"];
  NSData *dataBaseContent = [NSData dataWithContentsOfFile:dataBasePath];
  NSArray *features = [NSJSONSerialization JSONObjectWithData:dataBaseContent options:0 error:NULL];

  GRXWriter *locations = [[GRXWriter writerWithContainer:features] map:^id(id feature) {
    RTGPoint *location = [RTGPoint message];
    location.longitude = [((NSNumber *) feature[@"location"][@"longitude"]) intValue];
    location.latitude = [((NSNumber *) feature[@"location"][@"latitude"]) intValue];
    NSLog(@"Visiting point %@", location);
    return location;
  }];

  RTGRouteGuide *client = [[RTGRouteGuide alloc] initWithHost:kHostAddress];

  [client recordRouteWithRequestsWriter:locations handler:^(RTGRouteSummary *response, NSError *error) {
    if (response) {
      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);
    } else {
      NSLog(@"RPC error: %@", error);
    }
  }];
}

@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
@end

@implementation RouteChatViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  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]];
  GRXWriter *notesWriter = [[GRXWriter writerWithContainer:notes] map:^id(RTGRouteNote *note) {
    NSLog(@"Sending message %@ at %@", note.message, note.location);
    return note;
  }];

  RTGRouteGuide *client = [[RTGRouteGuide alloc] initWithHost:kHostAddress];

  [client routeChatWithRequestsWriter:notesWriter
                         eventHandler:^(BOOL done, RTGRouteNote *note, NSError *error) {
    if (note) {
      NSLog(@"Got message %@ at %@", note.message, note.location);
    } else if (error) {
      NSLog(@"RPC error: %@", error);
    }
    if (done) {
      NSLog(@"Chat ended.");
    }
  }];
}

@end