io.questdb.cutlass.http.processors.HealthCheckProcessor Maven / Gradle / Ivy

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 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2023 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
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 *  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.cutlass.http.processors;

import io.questdb.cutlass.http.HttpChunkedResponseSocket;
import io.questdb.cutlass.http.HttpConnectionContext;
import io.questdb.cutlass.http.HttpMinServerConfiguration;
import io.questdb.cutlass.http.HttpRequestProcessor;
import io.questdb.metrics.HealthMetricsImpl;
import io.questdb.network.PeerDisconnectedException;
import io.questdb.network.PeerIsSlowToReadException;

public class HealthCheckProcessor implements HttpRequestProcessor {

    private final boolean pessimisticMode;
    private final boolean requiresAuthentication;

    public HealthCheckProcessor(HttpMinServerConfiguration configuration) {
        this.pessimisticMode = configuration.isPessimisticHealthCheckEnabled();
        this.requiresAuthentication = configuration.isHealthCheckAuthenticationRequired();
    }

    @Override
    public void onRequestComplete(HttpConnectionContext context) throws PeerDisconnectedException, PeerIsSlowToReadException {
        HttpChunkedResponseSocket r = context.getChunkedResponseSocket();

        if (pessimisticMode) {
            final HealthMetricsImpl metrics = context.getMetrics().health();
            final long unhandledErrors = metrics.unhandledErrorsCount();
            if (unhandledErrors > 0) {
                r.status(500, "text/plain");
                r.sendHeader();
                r.put("Status: Unhealthy\nUnhandled errors: ");
                r.put(unhandledErrors);
                r.sendChunk(true);
                return;
            }
        }

        r.status(200, "text/plain");
        r.sendHeader();
        r.put("Status: Healthy");
        r.sendChunk(true);
    }

    @Override
    public boolean requiresAuthentication() {
        return requiresAuthentication;
    }
}