/
HNKNetworkFetcher.m
146 lines (119 loc) · 4.47 KB
/
HNKNetworkFetcher.m
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
//
// HNKNetworkFetcher.m
// Haneke
//
// Created by Hermes Pique on 7/23/14.
// Copyright (c) 2014 Hermes Pique. All rights reserved.
//
// 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 "HNKNetworkFetcher.h"
@implementation HNKNetworkFetcher {
NSURL *_URL;
BOOL _cancelled;
NSURLSessionDataTask *_dataTask;
}
- (instancetype)initWithURL:(NSURL*)URL
{
if (self = [super init])
{
_URL = URL;
}
return self;
}
- (NSString*)key
{
return _URL.absoluteString;
}
- (void)fetchImageWithSuccess:(void (^)(UIImage *image))successBlock failure:(void (^)(NSError *error))failureBlock;
{
_cancelled = NO;
__weak __typeof__(self) weakSelf = self;
_dataTask = [self.URLSession dataTaskWithURL:_URL completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
__strong __typeof__(weakSelf) strongSelf = weakSelf;
if (!strongSelf) return;
if (strongSelf->_cancelled) return;
NSURL *URL = strongSelf->_URL;
if (error)
{
if ([error.domain isEqualToString:NSURLErrorDomain] && error.code == NSURLErrorCancelled) return;
HanekeLog(@"Request %@ failed with error %@", URL.absoluteString, error);
if (!failureBlock) return;
dispatch_async(dispatch_get_main_queue(), ^{
failureBlock(error);
});
return;
}
if (![response isKindOfClass:NSHTTPURLResponse.class])
{
HanekeLog(@"Request %@ received unknown response %@", URL.absoluteString, response);
return;
}
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse*)response;
if (httpResponse.statusCode != 200)
{
NSString *errorDescription = [NSHTTPURLResponse localizedStringForStatusCode:httpResponse.statusCode];
[strongSelf failWithLocalizedDescription:errorDescription code:HNKErrorNetworkFetcherInvalidStatusCode block:failureBlock];
return;
}
const long long expectedContentLength = response.expectedContentLength;
if (expectedContentLength > -1)
{
const NSUInteger dataLength = data.length;
if (dataLength < expectedContentLength)
{
NSString *errorDescription = [NSString stringWithFormat:NSLocalizedString(@"Request %@ received %ld out of %ld bytes", @""), URL.absoluteString, (long)dataLength, (long)expectedContentLength];
[strongSelf failWithLocalizedDescription:errorDescription code:HNKErrorNetworkFetcherMissingData block:failureBlock];
return;
}
}
UIImage *image = [UIImage imageWithData:data];
if (!image)
{
NSString *errorDescription = [NSString stringWithFormat:NSLocalizedString(@"Failed to load image from data at URL %@", @""), URL];
[strongSelf failWithLocalizedDescription:errorDescription code:HNKErrorNetworkFetcherInvalidData block:failureBlock];
return;
}
dispatch_async(dispatch_get_main_queue(), ^{
successBlock(image);
});
}];
[_dataTask resume];
}
- (void)cancelFetch
{
[_dataTask cancel];
_cancelled = YES;
}
- (void)dealloc
{
[self cancelFetch];
}
#pragma mark Private
- (void)failWithLocalizedDescription:(NSString*)localizedDescription code:(NSInteger)code block:(void (^)(NSError *error))failureBlock;
{
HanekeLog(@"%@", localizedDescription);
if (!failureBlock) return;
NSDictionary *userInfo = @{ NSLocalizedDescriptionKey : localizedDescription , NSURLErrorKey : _URL};
NSError *error = [NSError errorWithDomain:HNKErrorDomain code:code userInfo:userInfo];
dispatch_async(dispatch_get_main_queue(), ^{
failureBlock(error);
});
}
@end
@implementation HNKNetworkFetcher(Subclassing)
- (NSURLSession*)URLSession
{
return [NSURLSession sharedSession];
}
@end