Constructing HTTP Chunks from ByteBuf in Netty 4

Question

I have a Netty 3 codebase with an HTTP Message decoder which extends ReplayingDecoder, and I need to migrate code which analyzes the chunks of the message, which means I need to get the chunks.

protected Object decode(ChannelHandlerContext ctx, Channel channel, 
                        ByteBuf buffer, State state) {

    //...

    HttpChunk chunk = new DefaultHttpChunk(buffer.readBytes(toRead));

    //...

}

From what I've gathered, I need to use HttpChunkedInput instead, but creating one is surprisingly difficult.

                                           //requires an InputStream...
HttpChunkedInput hc = new HttpChunkedInput(new ChunkedStream(...));

//but this seems really clunky/too awkward to be right.
HttpChunkedInput hc = new HttpChunkedInput(new ChunkedStream(new ByteArrayInputStream(buffer.array()));

ByteBuf doesn't seem to have a way to dump out a stream directly. Am I missing a Util class API that would be better? I did find there's a new EmbeddedChannel class which can simply readInbound() like here, but I'm not sure I should be changing the types just for that or casting the bare Channel to an EmbeddedChannel to get out of the problem.

score 1 · Answer 1 · answered Sep 07 '21 at 20:15

Netty 4.x onwards comes with an out of the box HTTP codec which unless you use an HTTP aggregation handler will give you HTTP chunks as HttpContent objects.

This example shows how to write a handler that received such chunks:

https://github.com/netty/netty/blob/a329857ec20cc1b93ceead6307c6849f93b3f101/example/src/main/java/io/netty/example/http/snoop/HttpSnoopServerHandler.java#L60

Constructing HTTP Chunks from ByteBuf in Netty 4

1 Answers1