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channelRead0() — netty Function Reference

Architecture documentation for the channelRead0() function in WebSocketIndexPageHandler.java from the netty codebase.

Function java Buffer Search calls 1

Entity Profile

Dependency Diagram

graph TD
  bed3075c_486b_aa7a_c6e9_bbec68fb8e86["channelRead0()"]
  8ea989dc_fe6f_0b1b_4077_4a12c09b3008["WebSocketIndexPageHandler"]
  bed3075c_486b_aa7a_c6e9_bbec68fb8e86 -->|defined in| 8ea989dc_fe6f_0b1b_4077_4a12c09b3008
  966de156_0f8c_6b06_20a6_e0712003b649["sendHttpResponse()"]
  bed3075c_486b_aa7a_c6e9_bbec68fb8e86 -->|calls| 966de156_0f8c_6b06_20a6_e0712003b649
  style bed3075c_486b_aa7a_c6e9_bbec68fb8e86 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

example/src/main/java/io/netty/example/http/websocketx/server/WebSocketIndexPageHandler.java lines 50–86

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, FullHttpRequest req) throws Exception {
        // Handle a bad request.
        if (!req.decoderResult().isSuccess()) {
            sendHttpResponse(ctx, req, new DefaultFullHttpResponse(req.protocolVersion(), BAD_REQUEST,
                                                                   ctx.alloc().buffer(0)));
            return;
        }

        // Handle websocket upgrade request.
        if (req.headers().contains(HttpHeaderNames.UPGRADE, HttpHeaderValues.WEBSOCKET, true)) {
            ctx.fireChannelRead(req.retain());
            return;
        }

        // Allow only GET methods.
        if (!GET.equals(req.method())) {
            sendHttpResponse(ctx, req, new DefaultFullHttpResponse(req.protocolVersion(), FORBIDDEN,
                                                                   ctx.alloc().buffer(0)));
            return;
        }

        // Send the index page
        if ("/".equals(req.uri()) || "/index.html".equals(req.uri())) {
            String webSocketLocation = getWebSocketLocation(ctx.pipeline(), req, websocketPath);
            ByteBuf content = WebSocketServerIndexPage.getContent(webSocketLocation);
            FullHttpResponse res = new DefaultFullHttpResponse(req.protocolVersion(), OK, content);

            res.headers().set(CONTENT_TYPE, "text/html; charset=UTF-8");
            HttpUtil.setContentLength(res, content.readableBytes());

            sendHttpResponse(ctx, req, res);
        } else {
            sendHttpResponse(ctx, req, new DefaultFullHttpResponse(req.protocolVersion(), NOT_FOUND,
                                                                   ctx.alloc().buffer(0)));
        }
    }

Domain

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Defined In

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Source

Frequently Asked Questions

What does channelRead0() do?
channelRead0() is a function in the netty codebase, defined in example/src/main/java/io/netty/example/http/websocketx/server/WebSocketIndexPageHandler.java.
Where is channelRead0() defined?
channelRead0() is defined in example/src/main/java/io/netty/example/http/websocketx/server/WebSocketIndexPageHandler.java at line 50.
What does channelRead0() call?
channelRead0() calls 1 function(s): sendHttpResponse.

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