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Currently, whenever an upstream service is down, kong will throw "{"message":"failure to get a peer from the ring-balancer"}"

I am trying to create a custom plugin that detects the connection time out and return a customized message to the client, the blocker I am facing right now is writing lua codes in my custom plugin to detect the timeout. I have tried using

if(kong.response.get_source() == "error")

but that does not seem to detect timeout either.

Does anyone have any idea what I should do to detect connection timeout in when writing a custom kong plugin?

Serene
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1 Answers1

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Sorry, I didn't catch you. Because I don't know what your function will return

If kong.response.get_source() returns a string {"message":"failure to get a peer from the ring-balancer"}

You need to use the JSON library to parse it.

local json = require("json")
local res = json.deceode(kong.response.get_source())
if res.message == "xxx" then

end

But your message is a little long. You can add a new key-value to the JSON string to represent the state.

For example:"{"status":"error","message":"failure to get a peer from the ring-balancer"}"

Then you can write code like this.

local json = require("json")
local res = json.deceode(kong.response.get_source())
if res.status == "error" then

end

I just looked at the Kong API Docs.

I find that the return value of kong.response.get_source() is HTTP status code, such as 200/500.

You can try print(kong.response.get_source()) and see the results.

MushroomMogu
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  • Hi @MushroomMogu, The "{"message":"failure to get a peer from the ring-balancer"}" response I'm getting is not from any function I wrote, Idk where its from either, what I'm trying to do is intercept that message from from being shown to client, which is why I created a custom plugin. In the plugin, I used if(kong.response.get_source() == "error"), according to https://docs.konghq.com/gateway-oss/2.4.x/pdk/kong.response/#kongresponseget_source, it is supposed to catch errors while processing request, eg: timeout while connecting to the upstream service. But that doesn't seem to be working. – Serene May 12 '21 at 02:21
  • @Serene Did you get any solution for this? – Amit Joseph Aug 25 '22 at 10:07