72 lines
2.8 KiB
Objective-C
72 lines
2.8 KiB
Objective-C
#import "FeedMeta+Ext.h"
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#import "Feed+Ext.h"
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#import "FeedGroup+Ext.h"
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@implementation FeedMeta (Ext)
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/// Create new instance with default @c refresh interval and set @c scheduled to distant past.
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+ (instancetype)newMetaInContext:(NSManagedObjectContext*)moc {
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FeedMeta *meta = [[FeedMeta alloc] initWithEntity:FeedMeta.entity insertIntoManagedObjectContext:moc];
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meta.refresh = kDefaultFeedRefreshInterval;
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meta.scheduled = [NSDate distantPast]; // will cause update to refresh as soon as possible
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return meta;
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}
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#pragma mark - HTTP response
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/// Increment @c errorCount and set new @c scheduled date (2^N minutes, max. 5.7 days).
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- (void)setErrorAndPostponeSchedule {
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if (self.errorCount < 0)
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self.errorCount = 0;
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int16_t n = self.errorCount + 1; // always increment errorCount (can be used to indicate bad feeds)
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#ifdef DEBUG
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NSLog(@"ERROR: Feed download failed: %@ (errorCount: %d)", self.url, n);
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#endif
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if ([self.scheduled timeIntervalSinceNow] > 30) // forced, early update. Scheduled is still in the futute.
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return; // Keep error counter low. Not enough time has passed (e.g., temporary server outage)
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NSTimeInterval retryWaitTime = pow(2, (n > 13 ? 13 : n)) * 60; // 2^N (between: 2 minutes and 5.7 days)
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self.errorCount = n;
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[self scheduleNow:retryWaitTime];
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}
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/// Copy Etag & Last-Modified headers and update URL (if not 304). Then schedule new update date. Will reset errorCount to @c 0
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- (void)setSucessfulWithResponse:(NSHTTPURLResponse*)response {
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self.errorCount = 0; // reset counter
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NSDictionary *header = [response allHeaderFields];
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if (response.statusCode != 304) { // not all servers set etag / modified when returning 304
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[self setEtag:header[@"Etag"] modified:header[@"Last-Modified"]];
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[self setUrlIfChanged:response.URL.absoluteString];
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}
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[self scheduleNow:self.refresh];
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}
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#pragma mark - Setter
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/// Set @c url attribute but only if value differs.
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- (void)setUrlIfChanged:(NSString*)url {
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if (![self.url isEqualToString:url]) self.url = url;
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}
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/// Set @c refresh attribute but only if value differs.
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- (void)setRefreshIfChanged:(int32_t)refresh {
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if (self.refresh != refresh) self.refresh = refresh;
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}
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/// Set @c etag and @c modified attributes. Only values that differ will be updated.
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- (void)setEtag:(NSString*)etag modified:(NSString*)modified {
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if (![self.etag isEqualToString:etag]) self.etag = etag;
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if (![self.modified isEqualToString:modified]) self.modified = modified;
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}
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/// Set next scheduled feed update or @c nil if @c refresh @c <= @c 0.
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- (void)scheduleNow:(NSTimeInterval)future {
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if (self.refresh <= 0) { // update deactivated; manually update with force update all
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if (self.scheduled != nil) // already nil? Avoid unnecessary core data edits
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self.scheduled = nil;
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} else {
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self.scheduled = [NSDate dateWithTimeIntervalSinceNow:future];
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}
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}
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@end
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