x/net/spdy: Framer lacks mechanism to more closely manage memory #6037
Description
Framer allocates a new buffer on every ReadFrame. This is very expensive when reading in large files. This lack of memory management also makes implementing flow control difficult. If endpoint A sets the stream window to 1 megabyte and endpoint B writes a frame with size 2 megabyte, we're forced to read in the 2 megabyte frame, meaning we can't do either of error handling options presented in the spec. A possibility is to have a method on framer that lets us set the buffer to be used on data frames. However, we would have to handle partial frame reads then.