Correct way to select websocket upstream based on client request?

[Tran Trong Tan]

Hello,

I'm trying the websocket module, and lua-resty-websocket-proxy (https://github.com/Kong/lua-resty-websocket-proxy) as well.

I'm looking for a way to dynamically select an upstream based on the client body request. For example, if the request body is contain text " getProfile" then it will go to / getProfile location, another request go to /proxy location.

        location / {
            content_by_lua_block {
                server = require "resty.websocket.server"
                wb, err = server:new()

                local data, typ, err = wb:recv_frame()

                local cjson = require('cjson')

                local datajson = cjson.decode(data)
                if datajson["action"]=="getProfile" then
                    return ngx.exec("@getProfile")
                else
                    return ngx.exec("@proxy")
                end

            }

        }

        location / getProfile {
            content_by_lua_block {

                response=" getProfile response"
                local bytes, err = wb:send_text(response)

            }

        }

        location /proxy {
            content_by_lua_block {
                local proxy = require "resty.websocket.proxy"

                local wp, err = proxy.new()

                local ok, err = wp:connect("ws://127.0.0.1:9000")

                local done, err = wp:execute()

            }

        }

When I make a test request, I got a error:  "*2 lua entry thread aborted: runtime error: attempt to call ngx.exec after sending out response headers"

So I think my logic is totally wrong. Do you have any idea?

Thank you,

Tan

[Junlong li]

Would you please change the  content_by_lua_block  to access_by_lua_block

[Trần Trọng Tấn]

Hello,

I tried already but got stuck when redirect the request through the location /proxy. How can I reroute a websocket request through another location?

Should I stop using lua-resty-websocket-proxy and build myself a proxy using lua-resty-websocket module?

Thank you,

Tan

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