Examples with ErrorData io.scalecube.streams.ErrorData used on opensource projects

Example 1 with ErrorData

use of io.scalecube.streams.ErrorData in project scalecube by scalecube.

the class GatewayHttpMessageHandler method channelActive.

@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
    ChannelContext channelContext = ChannelSupport.getChannelContextIfExist(ctx);
    if (channelContext == null) {
        LOGGER.error("Can't find channel context on channel: {}", ctx.channel());
        ctx.channel().close();
        return;
    }
    channelContext.listenWrite().map(Event::getMessageOrThrow).subscribe(message -> {
        Qualifier qualifier = Qualifier.fromString(message.qualifier());
        FullHttpResponse response;
        if (!Q_ERROR_NAMESPACE.equalsIgnoreCase(qualifier.getNamespace())) {
            response = message.containsData() ? HttpCodecUtil.okResponse((ByteBuf) message.data()) : HttpCodecUtil.emptyResponse();
        } else {
            if (message.dataOfType(ErrorData.class)) {
                // => ErrorData
                response = HttpCodecUtil.errorResponse(qualifier, (ErrorData) message.data());
            } else if (message.dataOfType(ByteBuf.class)) {
                // => ByteBuf assumed
                response = HttpCodecUtil.errorResponse(qualifier, (ByteBuf) message.data());
            } else {
                response = HttpCodecUtil.emptyErrorResponse(qualifier);
            }
        }
        // Hint: at this point we could add logic on writing headers to the response
        ctx.writeAndFlush(response).addListener((ChannelFutureListener) future -> {
            if (!future.isSuccess()) {
                channelContext.postWriteError(message, future.cause());
            } else {
                channelContext.postWriteSuccess(message);
            }
        });
    }, throwable -> {
        LOGGER.error("Fatal exception occured on channel context: {}, cause: {}", channelContext.getId(), throwable);
        ctx.channel().close();
    });
    super.channelActive(ctx);
}