Kong-pongo hangs with kong-plugin

Abhishekvrshny · February 14, 2020, 1:27am

hang is in socket receive here

openresty/lua-resty-dns/blob/master/lib/resty/dns/resolver.lua#L870


ok, err = sock:send(query)
if not ok then
    local server = _get_cur_server(self)
    err = "failed to send request to UDP server "
        .. concat(server, ":") .. ": " .. err


else
    local buf


    for _ = 1, 128 do
        buf, err = sock:receive(4096)
        if err then
            local server = _get_cur_server(self)
            err = "failed to receive reply from UDP server "
                .. concat(server, ":") .. ": " .. err
            break
        end


        if buf then
            local answers
            answers, err = parse_response(buf, id, opts)

Also, the default value of 2000 is taken as socket timeout. It’s unit is in milliseconds, but when I debugged, it appears to be seconds and hence the socket connection is not timing out. I tried overriding it with a value of 2 instead of 2000, the wait was then 2 seconds for each socket connection and the hang went away as it timeout out now.

github.com

openresty/lua-resty-dns/blob/master/lib/resty/dns/resolver.lua#L142


        host = server
        port = 53
        servers[i] = {host, port}
    end


    local ok, err = sock:setpeername(host, port)
    if not ok then
        return nil, "failed to set peer name: " .. err
    end


    sock:settimeout(timeout)


    insert(socks, sock)
end


local tcp_sock, err = tcp()
if not tcp_sock then
    return nil, "failed to create tcp socket: " .. err
end


tcp_sock:settimeout(timeout)

Topic		Replies	Views
Run Kong as Kubernetes Service with IPv6 Support Questions kubernetes	15	1978	April 21, 2020
Kong V14 - Kong error Questions	8	1654	August 31, 2018
Failed to parse host name "2a00:8a00:4000:20c::87:0fa6": invalid port) Questions	3	787	May 13, 2020
Pongo run timeout Questions plugins	1	802	November 22, 2021
Kong 1.4, K8S, DB-less, 504 Gateway timeout kubernetes , kong-gateway	19	6323	January 23, 2020

Kong-pongo hangs with kong-plugin

Related topics