Apparently the data set into shared context is not being freed

[lays147]

I have a plugin that sets a string to the Shared Context of Kong to be used in other plugins.
We noted that the memory consumption of the container increases during the workday. Apparently, the unused data is not being freed.

Based on the docs, it says that the data only exists during the existence of the request, so in my interpretation, when the request is over, the memory used would be freed, however, this does not seem the case.

I've already disabled the plugin during one day, and the memory consumption stabilizes.

Any idea how to handle this issue?

[77Vincent]

Hi @lays147
I had a memory issue recently with KONG plugin written in Golang as well, could you please kindly share more code detail? It may help the investigation a lot, thanks!

[lays147]

Hi @77Vincent , here is the snippet:

func (conf AzureAuthConfig) Access(kong *pdk.PDK) {
	bearerToken, err := kong.Request.GetHeader("Authorization")

	if err != nil || bearerToken == "" {
		log.Warn().Err(err).Msg("Error on retrieving Authorization header")
		payload := jsonpayload.PreparePayload(PluginName, 400, "", "Missing Authorization header", "")
		kong.Response.Exit(400, payload, jsonpayload.JsonHeader())
		return
	}

	isJwtValid := IsJwtValid(bearerToken, conf.TenantId, conf.ClientId)

	if !isJwtValid.IsValid {
		payload := jsonpayload.PreparePayload(PluginName, 401, "", isJwtValid.InvalidReason, "")
		kong.Response.Exit(401, payload, jsonpayload.JsonHeader())
		return
	}

	err = kong.Ctx.SetShared(conf.JWTContextKey, isJwtValid.RawJwt)
	if err != nil {
		message := "Error on saving JWT token into Kong Context."
		log.Error().Err(err).Msg(message)
		payload := jsonpayload.PreparePayload(PluginName, 500, "", message, "")
		kong.Response.Exit(500, payload, jsonpayload.JsonHeader())
		return
	}
}

The rest of the plugin can be found here. The only difference is that the corporate version of the plugin that I developed sets the JWT to the Kong cache, as shown in the snippet.