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SMWebRequest.m
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SMWebRequest.m
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#import "SMWebRequest.h"
//
// Utility class for tracking our target/action pairs.
//
@interface SMTargetAction : NSObject {
@package
id target;
SEL action;
SMWebRequestEvents events;
}
@end
@implementation SMTargetAction
@end
//
// WebRequest.
//
NSString *const kSMWebRequestComplete = @"SMWebRequestComplete", *const kSMWebRequestError = @"SMWebRequestError";
NSString *const SMErrorResponseKey = @"response";
@interface SMWebRequest ()
@property (nonatomic, assign) id<SMWebRequestDelegate> delegate;
@property (nonatomic, retain) id context;
@property (nonatomic, retain) NSMutableArray *targetActions;
@property (nonatomic, retain) NSMutableData *data;
@property (nonatomic, retain) NSMutableURLRequest *request;
@property (nonatomic, retain) NSURLResponse *response;
@property (nonatomic, retain) NSURLConnection *connection;
@end
@implementation SMWebRequest
@synthesize context, targetActions, delegate, data, request, response, connection;
- (id)initWithURLRequest:(NSMutableURLRequest *)theRequest delegate:(id<SMWebRequestDelegate>)theDelegate context:(id)theContext {
self = [super init];
if (self) {
self.request = theRequest;
self.delegate = theDelegate;
self.context = theContext;
self.targetActions = [NSMutableArray array];
}
return self;
}
- (void)dealloc {
//NSLog(@"Dealloc %@", self);
[self cancel];
self.delegate = nil;
self.context = nil;
self.request = nil;
self.response = nil;
self.data = nil;
self.connection = nil;
self.targetActions = nil;
[super dealloc];
}
+ (SMWebRequest *)requestWithURL:(NSURL *)theURL {
return [SMWebRequest requestWithURL:theURL delegate:nil context:nil];
}
+ (SMWebRequest *)requestWithURL:(NSURL *)theURL delegate:(id<SMWebRequestDelegate>)theDelegate context:(id)theContext {
return [SMWebRequest requestWithURLRequest:[NSMutableURLRequest requestWithURL:theURL] delegate:theDelegate context:theContext];
}
+ (SMWebRequest *)requestWithURLRequest:(NSMutableURLRequest *)theRequest delegate:(id<SMWebRequestDelegate>)theDelegate context:(id)theContext {
return [[[SMWebRequest alloc] initWithURLRequest:theRequest delegate:theDelegate context:theContext] autorelease];
}
- (NSString *)description {
return [NSString stringWithFormat:@"<%@>", self.request.URL];
}
- (void)start {
if (requestFlags.started) return; // subsequent calls to this method won't do anything
requestFlags.started = YES;
//NSLog(@"Requesting %@", self);
self.data = [NSMutableData data];
self.connection = [NSURLConnection connectionWithRequest:request delegate:self];
}
- (BOOL)started { return requestFlags.started; }
- (void)cancel {
if (requestFlags.cancelled) return; // subsequent calls to this method won't do anything
// the only thing that can actually be "cancelled" is the NSURLConnection. Background thread processing can't be
// cancelled since the background thread must run to completion or else you end up with god knows what on the heap.
if (connection) {
//NSLog(@"Cancelling %@", self);
[connection cancel];
self.connection = nil;
}
requestFlags.cancelled = YES;
self.context = nil; // you'll never hear from us again.
}
#pragma mark Target/Action management
- (void)setHTTPMethod:(NSString *)method {
[self.request setHTTPMethod:method];
}
- (void)setHTTPBody:(NSMutableData *)bodyData {
[self.request setHTTPBody:bodyData];
}
- (void)setContentType:(NSString *)contentType {
[self.request setValue:contentType forHTTPHeaderField: @"Content-Type"];
}
- (SMTargetAction *)targetActionForTarget:(id)target action:(SEL)action {
for(SMTargetAction *ta in targetActions)
if (ta->target == target && (ta->action == action || !action))
return ta;
return nil;
}
- (void)addTarget:(id)target action:(SEL)action forRequestEvents:(SMWebRequestEvents)events {
SMTargetAction *ta = [self targetActionForTarget:target action:action];
if (!ta) {
ta = [[[SMTargetAction alloc] init] autorelease];
ta->target = target;
ta->action = action;
[targetActions addObject:ta];
}
ta->events |= events;
}
- (void)removeTarget:(id)target action:(SEL)action forRequestEvents:(SMWebRequestEvents)events {
while (true) { // if you passed NULL for the action, we may have to search multiple times
SMTargetAction *ta = [self targetActionForTarget:target action:action];
if (!ta) break;
SMWebRequestEvents toRemove = ta->events & events;
ta->events -= toRemove;
if (!ta->events)
[targetActions removeObject:ta];
}
if (![targetActions count])
[self cancel];
}
- (void)removeTarget:(id)target {
[self removeTarget:target action:NULL forRequestEvents:SMWebRequestEventAllEvents];
}
- (NSMutableArray *)targetActionsForEvents:(SMWebRequestEvents)events {
NSMutableArray *resultTargetActions = [NSMutableArray array];
for(SMTargetAction *ta in targetActions)
if ((ta->events & events) != 0) [resultTargetActions addObject:ta];
return resultTargetActions;
}
// only call on main thread
- (void)dispatchEvents:(SMWebRequestEvents)events withArgument:(id)arg {
for (SMTargetAction *ta in [self targetActionsForEvents:events])
[ta->target performSelector:ta->action withObject:arg withObject:context];
// events dispatched (if any) and delegate called (if any); so we're done.
self.context = nil;
}
- (void)dispatchComplete:(id)resultObject {
// notify the delegate first
if ([delegate respondsToSelector:@selector(webRequest:didCompleteWithResult:context:)])
[delegate webRequest:self didCompleteWithResult:resultObject context:context];
// notify event listeners
[self dispatchEvents:SMWebRequestEventComplete withArgument:resultObject];
// notify the world last
[[NSNotificationCenter defaultCenter] postNotificationName:kSMWebRequestComplete object:self];
}
- (void)dispatchError:(NSError *)error {
// notify the delegate first
if ([delegate respondsToSelector:@selector(webRequest:didFailWithError:context:)])
[delegate webRequest:self didFailWithError:error context:context];
// notify event listeners
[self dispatchEvents:SMWebRequestEventError withArgument:error];
// notify the world last
NSDictionary *info = [NSDictionary dictionaryWithObject:error forKey:NSUnderlyingErrorKey];
[[NSNotificationCenter defaultCenter] postNotificationName:kSMWebRequestError object:self userInfo:info];
}
// in a background thread! don't touch our instance members!
- (void)processDataInBackground:(NSData *)theData {
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
id resultObject = theData;
if ([delegate respondsToSelector:@selector(webRequest:resultObjectForData:context:)])
resultObject = [delegate webRequest:self resultObjectForData:theData context:context];
[self performSelectorOnMainThread:@selector(backgroundProcessingComplete:) withObject:resultObject waitUntilDone:NO];
[pool release];
}
// back on the main thread
- (void)backgroundProcessingComplete:(id)resultObject {
if (!requestFlags.cancelled)
[self dispatchComplete:resultObject];
[delegate release];
[self release];
}
#pragma mark NSURLConnection delegate methods
- (NSMutableURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSMutableURLRequest *)newRequest redirectResponse:(NSURLResponse *)redirectResponse {
if (redirectResponse && [(NSHTTPURLResponse *)redirectResponse statusCode] != 301)
requestFlags.wasTemporarilyRedirected = YES;
// see if our delegate cares about this
if ([delegate respondsToSelector:@selector(webRequest:willSendRequest:redirectResponse:)])
return [delegate webRequest:self willSendRequest:newRequest redirectResponse:redirectResponse];
else
return newRequest; // let it happen
}
- (void)connection:(NSURLConnection *)conn didReceiveResponse:(NSURLResponse *)aResponse {
self.response = aResponse;
[data setLength:0];
}
- (void)connection:(NSURLConnection *)conn didReceiveData:(NSData *)moreData {
[data appendData:moreData];
}
- (void)connection:(NSURLConnection *)conn didFailWithError:(NSError *)error {
NSLog(@"SMWebRequest's NSURLConnection failed! Error - %@ %@", error, conn);
self.connection = nil;
self.data = nil;
[self retain]; // we must retain ourself before we call handlers, in case they release us!
[self dispatchError:error];
[self release];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)conn {
//NSLog(@"Finished loading %@", self);
[self retain]; // we must retain ourself before we call handlers, in case they release us!
NSInteger status = [response isKindOfClass:[NSHTTPURLResponse class]] ? [(NSHTTPURLResponse *)response statusCode] : 200;
if (conn && response && (status < 200 || (status >= 300 && status != 304))) {
NSLog(@"Failed with HTTP status code %i while loading %@", (int)status, self);
SMErrorResponse *error = [[[SMErrorResponse alloc] init] autorelease];
error.response = (NSHTTPURLResponse *)response;
error.data = data;
NSMutableDictionary* details = [NSMutableDictionary dictionaryWithObjectsAndKeys:
@"Received an HTTP status code indicating failure.", NSLocalizedDescriptionKey,
error, SMErrorResponseKey,
nil];
[self dispatchError:[NSError errorWithDomain:@"SMWebRequest" code:status userInfo:details]];
}
else {
if ([delegate respondsToSelector:@selector(webRequest:resultObjectForData:context:)]) {
// neither us nor our delegate can get dealloced whilst processing on the background
// thread or else the background thread could try to do stuff with pointers to garbage.
// thus we need have a mechanism for keeping ourselves alive during the background
// processing.
[self retain];
[delegate retain];
[self performSelectorInBackground:@selector(processDataInBackground:) withObject:data];
}
else
[self dispatchComplete:data];
}
self.connection = nil;
self.data = nil; // don't keep this!
[self release];
}
@end
@implementation SMErrorResponse
@synthesize response, data;
- (void)dealloc {
self.response = nil;
self.data = nil;
[super dealloc];
}
@end