Added support for asynchronous reading in GCDWebServerBodyReader

GCDWebServer/Core/GCDWebServerConnection.m

@@ -280,8 +280,8 @@ static inline NSUInteger _ScanHexNumber(const void* bytes, NSUInteger size) {
 
 - (void)_writeBodyWithCompletionBlock:(WriteBodyCompletionBlock)block {
   GWS_DCHECK([_response hasBody]);
-  NSError* error = nil;
-  NSData* data = [_response performReadData:&error];
+  [_response performReadDataWithCompletion:^(NSData* data, NSError* error) {
+    
     if (data) {
       if (data.length) {
         if (_response.usesChunkedTransferEncoding) {
@@ -328,6 +328,8 @@ static inline NSUInteger _ScanHexNumber(const void* bytes, NSUInteger size) {
       GWS_LOG_ERROR(@"Failed reading response body for socket %i: %@", _socket, error);
       block(NO);
     }
+    
+  }];
 }
 
 @end

GCDWebServer/Core/GCDWebServerPrivate.h

@@ -249,6 +249,6 @@ extern NSString* GCDWebServerStringFromSockAddr(const struct sockaddr* addr, BOO
 @property(nonatomic, readonly) BOOL usesChunkedTransferEncoding;
 - (void)prepareForReading;
 - (BOOL)performOpen:(NSError**)error;
-- (NSData*)performReadData:(NSError**)error;
+- (void)performReadDataWithCompletion:(GCDWebServerBodyReaderCompletionBlock)block;
 - (void)performClose;
 @end

GCDWebServer/Core/GCDWebServerResponse.h

@@ -27,6 +27,12 @@
 
 #import <Foundation/Foundation.h>
 
+/**
+ *  The GCDWebServerBodyReaderCompletionBlock is passed by GCDWebServer to the
+ *  GCDWebServerBodyReader object when reading data from it asynchronously.
+ */
+typedef void (^GCDWebServerBodyReaderCompletionBlock)(NSData* data, NSError* error);
+
 /**
  *  This protocol is used by the GCDWebServerConnection to communicate with
  *  the GCDWebServerResponse and read the HTTP body data to send.
@@ -39,6 +45,8 @@
  */
 @protocol GCDWebServerBodyReader <NSObject>
 
+@required
+
 /**
  *  This method is called before any body data is sent.
  *
@@ -61,6 +69,17 @@
  */
 - (void)close;
 
+@optional
+
+/**
+ *  If this method is implemented, it will be preferred over -readData:.
+ *
+ *  It must call the passed block when data is available, passing a non-empty
+ *  NSData if there is body data available, or an empty NSData there is no more
+ *  body data, or nil on error and pass an NSError along.
+ */
+- (void)asyncReadDataWithCompletion:(GCDWebServerBodyReaderCompletionBlock)block;
+
 @end
 
 /**

GCDWebServer/Core/GCDWebServerResponse.m

@@ -244,9 +244,14 @@
   return [_reader open:error];
 }
 
-- (NSData*)performReadData:(NSError**)error {
-  GWS_DCHECK(_opened);
-  return [_reader readData:error];
+- (void)performReadDataWithCompletion:(GCDWebServerBodyReaderCompletionBlock)block {
+  if ([_reader respondsToSelector:@selector(asyncReadDataWithCompletion:)]) {
+    [_reader asyncReadDataWithCompletion:block];
+  } else {
+    NSError* error = nil;
+    NSData* data = [_reader readData:&error];
+    block(data, error);
+  }
 }
 
 - (void)performClose {