Fixed incorrect documentation for GCDWebServerAsyncStreamBlock

GCDWebServer/Responses/GCDWebServerStreamedResponse.h

@@ -29,8 +29,8 @@
 
 /**
  *  The GCDWebServerStreamBlock is called to stream the data for the HTTP body.
- *  The block must return empty NSData when done or nil on error and set the
- *  "error" argument which is guaranteed to be non-NULL.
+ *  The block must return either a chunk of data, an empty NSData when done, or
+ *  nil on error and set the "error" argument which is guaranteed to be non-NULL.
  */
 typedef NSData* (^GCDWebServerStreamBlock)(NSError** error);
 
@@ -39,13 +39,10 @@ typedef NSData* (^GCDWebServerStreamBlock)(NSError** error);
  *  except the streamed data can be returned at a later time allowing for
  *  truly asynchronous generation of the data.
  *
- *  The block must return empty NSData when done or nil on error and set the
- *  "error" argument which is guaranteed to be non-NULL.
+ *  The block must call "completionBlock" passing the new chunk of data when ready,
+ *  an empty NSData when done, or nil on error and pass a NSError.
  *
- *  The block must regularly call "completionBlock" passing new streamed data.
- *  Eventually it must call "completionBlock" passing an empty NSData indicating
- *  the end of the stream has been reached, or pass nil and an NSError in case of
- *  error.
+ *  The block cannot call "completionBlock" more than once per invocation.
  */
 typedef void (^GCDWebServerAsyncStreamBlock)(GCDWebServerBodyReaderCompletionBlock completionBlock);
 

Mac/main.m

@@ -52,8 +52,7 @@ typedef enum {
   kMode_WebDAV,
   kMode_WebUploader,
   kMode_StreamingResponse,
-  kMode_AsyncResponse,
-  kMode_AsyncResponse2
+  kMode_AsyncResponse
 } Mode;
 
 @interface Delegate : NSObject <GCDWebServerDelegate, GCDWebDAVServerDelegate, GCDWebUploaderDelegate>
@@ -145,7 +144,7 @@ int main(int argc, const char* argv[]) {
     BOOL bindToLocalhost = NO;
     
     if (argc == 1) {
-      fprintf(stdout, "Usage: %s [-mode webServer | htmlPage | htmlForm | htmlFileUpload | webDAV | webUploader | streamingResponse | asyncResponse | asyncResponse2] [-record] [-root directory] [-tests directory] [-authenticationMethod Basic | Digest] [-authenticationRealm realm] [-authenticationUser user] [-authenticationPassword password] [--localhost]\n\n", basename((char*)argv[0]));
+      fprintf(stdout, "Usage: %s [-mode webServer | htmlPage | htmlForm | htmlFileUpload | webDAV | webUploader | streamingResponse | asyncResponse] [-record] [-root directory] [-tests directory] [-authenticationMethod Basic | Digest] [-authenticationRealm realm] [-authenticationUser user] [-authenticationPassword password] [--localhost]\n\n", basename((char*)argv[0]));
     } else {
       for (int i = 1; i < argc; ++i) {
         if (argv[i][0] != '-') {
@@ -169,8 +168,6 @@ int main(int argc, const char* argv[]) {
             mode = kMode_StreamingResponse;
           } else if (!strcmp(argv[i], "asyncResponse")) {
             mode = kMode_AsyncResponse;
-          } else if (!strcmp(argv[i], "asyncResponse2")) {
-            mode = kMode_AsyncResponse2;
           }
         } else if (!strcmp(argv[i], "-record")) {
           recording = YES;
@@ -360,7 +357,7 @@ int main(int argc, const char* argv[]) {
         fprintf(stdout, "Running in Async Response mode");
         webServer = [[GCDWebServer alloc] init];
         [webServer addHandlerForMethod:@"GET"
-                                  path:@"/"
+                                  path:@"/async"
                           requestClass:[GCDWebServerRequest class]
                      asyncProcessBlock:^(GCDWebServerRequest* request, GCDWebServerCompletionBlock completionBlock) {
           
@@ -370,15 +367,8 @@ int main(int argc, const char* argv[]) {
           });
           
         }];
-        break;
-      }
-      
-      // Test async responses 2
-      case kMode_AsyncResponse2: {
-        fprintf(stdout, "Running in Async Response 2 mode");
-        webServer = [[GCDWebServer alloc] init];
         [webServer addHandlerForMethod:@"GET"
-                                  path:@"/"
+                                  path:@"/async2"
                           requestClass:[GCDWebServerRequest class]
                      asyncProcessBlock:^(GCDWebServerRequest* request, GCDWebServerCompletionBlock handlerCompletionBlock) {
           

README.md

@@ -188,22 +188,23 @@ New in GCDWebServer 3.0 is the ability to process HTTP requests aysnchronously i
                          requestClass:[GCDWebServerRequest class]
                          processBlock:^GCDWebServerResponse *(GCDWebServerRequest* request) {
   
+  NSMutableArray* contents = [NSMutableArray arrayWithObjects:@"<html><body><p>\n", @"Hello World!\n", @"</p></body></html>\n", nil];  // Fake data source we are reading from
   GCDWebServerStreamedResponse* response = [GCDWebServerStreamedResponse responseWithContentType:@"text/html" asyncStreamBlock:^(GCDWebServerBodyReaderCompletionBlock completionBlock) {
     
+    // Simulate a delay reading from the fake data source
     dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
-      completionBlock([@"<html><body><p>Hello" dataUsingEncoding:NSUTF8StringEncoding], nil);  // Generate the 1st part of the stream data
-      
-      dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
-        completionBlock([@"World</p></body></html>" dataUsingEncoding:NSUTF8StringEncoding], nil);  // Generate the 2nd part of the stream data
-        
+      NSString* string = contents.firstObject;
+      if (string) {
+        [contents removeObjectAtIndex:0];
+        completionBlock([string dataUsingEncoding:NSUTF8StringEncoding], nil);  // Generate the 2nd part of the stream data
+      } else {
         completionBlock([NSData data], nil);  // Must pass an empty NSData to signal the end of the stream
-       });
-       
+      }
     });
     
   }];
   return response;
-
+  
 }];
 ```