io.questdb.metrics.PrometheusFormatUtils Maven / Gradle / Ivy

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2020 QuestDB
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
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package io.questdb.metrics;

import io.questdb.std.str.CharSink;

class PrometheusFormatUtils {
    static final CharSequence TYPE_PREFIX = "# TYPE questdb_";
    static final CharSequence METRIC_NAME_PREFIX = "questdb_";
    static final char LF = '\n';

    static void appendNewLine(CharSink sink) {
        sink.put(LF);
    }

    static void appendSampleLineSuffix(CharSink sink, long value) {
        sink.put(' ');
        sink.put(value);
        sink.put(LF);
    }

    static void appendLabel(CharSink sink, CharSequence labelName, CharSequence labelValue) {
        sink.put(labelName);
        sink.put('=');
        sink.putQuoted(labelValue);
    }

    static void appendCounterType(CharSequence name, CharSink sink) {
        sink.put(TYPE_PREFIX);
        sink.put(name);
        sink.put("_total counter\n");
    }

    static void appendCounterNamePrefix(CharSequence name, CharSink sink) {
        sink.put(METRIC_NAME_PREFIX);
        sink.put(name);
        sink.put("_total");
    }
}