io.werval.modules.metrics.Tools.java Source code

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/*
 * Copyright (c) 2014 the original author or authors
 *
 * 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,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.werval.modules.metrics;

import com.codahale.metrics.health.HealthCheck;
import com.codahale.metrics.jvm.ThreadDump;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectWriter;
import io.werval.api.outcomes.Outcome;
import io.werval.controllers.Classpath;
import io.werval.filters.ContentSecurityPolicy;
import io.werval.filters.NeverCached;
import io.werval.filters.XContentTypeOptions;
import io.werval.filters.XFrameOptions;
import io.werval.filters.XXSSProtection;
import java.io.ByteArrayOutputStream;
import java.lang.management.ManagementFactory;
import java.util.SortedMap;
import io.werval.modules.json.JSON;

import static io.werval.api.context.CurrentContext.outcomes;
import static io.werval.api.context.CurrentContext.plugin;
import static io.werval.api.context.CurrentContext.request;

/**
 * Metrics Tools.
 */
@NeverCached
@XContentTypeOptions
public class Tools {
    @ContentSecurityPolicy
    @XFrameOptions
    @XXSSProtection
    public Outcome devShellIndex() {
        return new Classpath().resource("io/werval/modules/metrics/devshell-index.html");
    }

    public Outcome metrics() throws JsonProcessingException {
        return outcomes().ok(getJsonWriter().writeValueAsBytes(plugin(Metrics.class).metrics())).asJson().build();
    }

    public Outcome healthchecks() throws JsonProcessingException {
        SortedMap<String, HealthCheck.Result> results = plugin(Metrics.class).healthChecks().runHealthChecks();
        byte[] body = getJsonWriter().writeValueAsBytes(results);
        if (!results.values().stream().allMatch(r -> r.isHealthy())) {
            return outcomes().internalServerError().withBody(body).asJson().build();
        }
        return outcomes().ok(body).asJson().build();
    }

    public Outcome threadDump() {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        new ThreadDump(ManagementFactory.getThreadMXBean()).dump(baos);
        return outcomes().ok(baos.toByteArray()).asTextPlain().build();
    }

    private static ObjectWriter getJsonWriter() {
        final boolean prettyPrint = Boolean
                .parseBoolean(request().queryString().firstValueOptional("pretty").orElse("false"));
        if (prettyPrint) {
            return plugin(JSON.class).mapper().writerWithDefaultPrettyPrinter();
        }
        return plugin(JSON.class).mapper().writer();
    }
}