Why am I receiving a null value for call.response....

# ktor

[theMackabu]

Why am I receiving a null value for call.response.status() when using a custom plugin?

val FileLogger = createApplicationPlugin(name = "FileLogger", createConfiguration = ::PluginConfiguration) {
    val path = pluginConfig.path
    val logFile = File(path)
    val gson = Gson()

    onCall { call ->
        val uri = call.request.uri
        val status = call.response.status()
        val httpMethod = call.request.httpMethod.value
        val userAgent = call.request.headers["User-Agent"]
        val timestamp = LocalDateTime.now().format(DateTimeFormatter.ISO_LOCAL_DATE_TIME)

        val logEntry = gson.toJson(object: LogMessage {
            override var timestamp = "$timestamp"
            override var status = "$status"
            override var method = "$httpMethod"
            override var path = "$uri"
            override var userAgent = "$userAgent"
        })

        logFile.appendText("$logEntry\n")
    }
}

everything else is populated but status is always null
(side note, is it possible to report error messages here?)

[Rustam Siniukov]

because onCall { ... } is called before routing, so you probably haven’t called call.respond(...) yet. try to change it to onCallRespond { ... }

[theMackabu]

alright, ill try that

[theMackabu]

Intresting, for routes that have HttpStatusCode.OK in their call.respond it is not null now, but routes without a set status are null

[theMackabu]

and normal 404's still report as null

[Rustam Siniukov]

yes, you are right, it happens before body is transformed. on(ResponseSent) { ... } is what you need. But why don’t you just config CallLogging to write to file in json format?

[Rustam Siniukov]

also, please note, that file write operations are blocking and do not work well with coroutines

[theMackabu]

I was not actually sure how to disable logging to console with CallLogging