#176 log redis metrics

pom.xml

@@ -64,6 +64,11 @@
             <artifactId>slf4j-api</artifactId>
             <version>${slf4j.version}</version>
         </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
+        </dependency>
 
         <!-- TEST dependencies -->
         <dependency>
@@ -406,6 +411,7 @@
         <commons-codec.version>1.16.0</commons-codec.version>
         <commons-lang.version>2.6</commons-lang.version>
         <commons-io.version>2.15.1</commons-io.version>
+        <guava.version>33.1.0-jre</guava.version>
         <mockito.version>1.10.19</mockito.version>
         <rest-assured.version>5.4.0</rest-assured.version>
         <awaitility.version>4.2.0</awaitility.version>

src/main/java/org/swisspush/reststorage/redis/EventBusRedisMetricsPublisher.java

@@ -0,0 +1,23 @@
+package org.swisspush.reststorage.redis;
+
+import io.vertx.core.Vertx;
+import io.vertx.core.json.JsonObject;
+
+public class EventBusRedisMetricsPublisher implements RedisMetricsPublisher {
+
+    private final Vertx vertx;
+    private final String monitoringAddress;
+    private final String prefix;
+
+    public EventBusRedisMetricsPublisher(Vertx vertx, String monitoringAddress, String prefix) {
+        this.vertx = vertx;
+        this.monitoringAddress = monitoringAddress;
+        this.prefix = prefix;
+    }
+
+    @Override
+    public void publishMetric(String name, long value) {
+        vertx.eventBus().publish(monitoringAddress,
+                new JsonObject().put("name", prefix + name).put("action", "set").put("n", value));
+    }
+}

src/main/java/org/swisspush/reststorage/redis/RedisMetricsPublisher.java

@@ -0,0 +1,6 @@
+package org.swisspush.reststorage.redis;
+
+public interface RedisMetricsPublisher {
+
+    void publishMetric(String name, long value);
+}

src/main/java/org/swisspush/reststorage/redis/RedisMonitor.java

@@ -0,0 +1,122 @@
+package org.swisspush.reststorage.redis;
+
+import com.google.common.base.Splitter;
+import io.vertx.core.Vertx;
+import io.vertx.core.buffer.Buffer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class RedisMonitor {
+    private final Vertx vertx;
+    private final RedisProvider redisProvider;
+    private final int periodMs;
+    private final String expirableKey;
+    private long timer;
+    private final Logger log = LoggerFactory.getLogger(RedisMonitor.class);
+
+    private static final String DELIMITER = ":";
+
+    private final RedisMetricsPublisher publisher;
+
+    /**
+     * @param vertx         vertx
+     * @param redisProvider RedisProvider
+     * @param monitoringAddress The EventBus address to send metrics to
+     * @param name          name used in the metrics EventBus message
+     * @param expirableKey  name of the expirable resources entry
+     * @param periodSec     period in seconds to gather redis metrics
+     */
+    public RedisMonitor(Vertx vertx, RedisProvider redisProvider, String monitoringAddress, String name, String expirableKey, int periodSec) {
+        this(vertx, redisProvider, expirableKey, periodSec,
+                new EventBusRedisMetricsPublisher(vertx, monitoringAddress, "redis." + name + ".")
+        );
+    }
+
+    public RedisMonitor(Vertx vertx, RedisProvider redisProvider, String expirableKey, int periodSec, RedisMetricsPublisher publisher) {
+        this.vertx = vertx;
+        this.redisProvider = redisProvider;
+        this.expirableKey = expirableKey;
+        this.periodMs = periodSec * 1000;
+        this.publisher = publisher;
+    }
+
+    public void start() {
+        timer = vertx.setPeriodic(periodMs, timer -> redisProvider.redis().onSuccess(redisAPI -> {
+            redisAPI.info(new ArrayList<>()).onComplete(event -> {
+                if (event.succeeded()) {
+                    collectMetrics(event.result().toBuffer());
+                } else {
+                    log.warn("Cannot collect INFO from redis");
+                }
+            });
+
+            redisAPI.zcard(expirableKey, reply -> {
+                if (reply.succeeded()) {
+                    long value = reply.result().toLong();
+                    publisher.publishMetric("expirable", value);
+                } else {
+                    log.warn("Cannot collect zcard from redis for key {}", expirableKey);
+                }
+            });
+
+        }).onFailure(throwable -> log.warn("Cannot collect INFO from redis", throwable)));
+    }
+
+    public void stop() {
+        if (timer != 0) {
+            vertx.cancelTimer(timer);
+            timer = 0;
+        }
+    }
+
+    private void collectMetrics(Buffer buffer) {
+        Map<String, String> map = new HashMap<>();
+
+        Splitter.on(System.lineSeparator()).omitEmptyStrings()
+                .trimResults().splitToList(buffer.toString()).stream()
+                .filter(input -> input != null && input.contains(DELIMITER)
+                        && !input.contains("executable")
+                        && !input.contains("config_file")).forEach(entry -> {
+                    List<String> keyValue = Splitter.on(DELIMITER).omitEmptyStrings().trimResults().splitToList(entry);
+                    if (keyValue.size() == 2) {
+                        map.put(keyValue.get(0), keyValue.get(1));
+                    }
+                });
+
+        log.debug("got redis metrics {}", map);
+
+        map.forEach((key, valueStr) -> {
+            long value;
+            try {
+                if (key.startsWith("db")) {
+                    String[] pairs = valueStr.split(",");
+                    for (String pair : pairs) {
+                        String[] tokens = pair.split("=");
+                        if (tokens.length == 2) {
+                            value = Long.parseLong(tokens[1]);
+                            publisher.publishMetric("keyspace." + key + "." + tokens[0], value);
+                        } else {
+                            log.warn("Invalid keyspace property. Will be ignored");
+                        }
+                    }
+                } else if (key.contains("_cpu_")) {
+                    value = (long) (Double.parseDouble(valueStr) * 1000.0);
+                    publisher.publishMetric(key, value);
+                } else if (key.contains("fragmentation_ratio")) {
+                    value = (long) (Double.parseDouble(valueStr));
+                    publisher.publishMetric(key, value);
+                } else {
+                    value = Long.parseLong(valueStr);
+                    publisher.publishMetric(key, value);
+                }
+            } catch (NumberFormatException e) {
+                log.warn("ignore field '{}' because '{}' doesnt look number-ish enough", key, valueStr);
+            }
+        });
+    }
+}

src/main/java/org/swisspush/reststorage/redis/RedisStorage.java

@@ -1,5 +1,6 @@
 package org.swisspush.reststorage.redis;
 
+import com.google.common.base.Strings;
 import io.vertx.core.AsyncResult;
 import io.vertx.core.Future;
 import io.vertx.core.Handler;
@@ -76,6 +77,8 @@ public class RedisStorage implements Storage {
     private final Lock lock;
 
     private final RedisProvider redisProvider;
+
+    private RedisMonitor redisMonitor;
     private final Map<LuaScript, LuaScriptState> luaScripts = new HashMap<>();
     private final DecimalFormat decimalFormat;
 
@@ -132,6 +135,21 @@ public RedisStorage(Vertx vertx, ModuleConfiguration config, RedisProvider redis
         if (resourceCleanupIntervalSec != null) {
             startPeriodicStorageCleanup(resourceCleanupIntervalSec * 1000L);
         }
+
+        registerMetricsGathering(config);
+    }
+
+    private void registerMetricsGathering(ModuleConfiguration configuration){
+        String metricsAddress = configuration.getRedisPublishMetrcisAddress();
+        if(Strings.isNullOrEmpty(metricsAddress)) {
+            return;
+        }
+        String metricsPrefix = configuration.getRedisPublishMetrcisPrefix();
+        int metricRefreshPeriodSec = configuration.getRedisPublishMetrcisRefreshPeriodSec();
+
+        redisMonitor = new RedisMonitor(vertx, redisProvider, metricsAddress, metricsPrefix,
+                configuration.getExpirablePrefix(), metricRefreshPeriodSec);
+        redisMonitor.start();
     }
 
     private void startPeriodicStorageCleanup(long intervalMs) {

src/main/java/org/swisspush/reststorage/util/ModuleConfiguration.java

@@ -44,6 +44,9 @@ public enum StorageType {
      */
     @Deprecated(since = "3.0.17")
     private String redisAuth = null;
+    private String redisPublishMetrcisAddress = null;
+    private String redisPublishMetrcisPrefix = "storage";
+    private int redisPublishMetrcisRefreshPeriodSec = 10;
     private int redisReconnectAttempts = 0;
     private int redisReconnectDelaySec = 30;
     private int redisPoolRecycleTimeoutMs = 180_000;
@@ -172,6 +175,21 @@ public ModuleConfiguration redisAuth(String redisAuth) {
         return this;
     }
 
+    public ModuleConfiguration redisPublishMetrcisAddress(String redisPublishMetrcisAddress) {
+        this.redisPublishMetrcisAddress = redisPublishMetrcisAddress;
+        return this;
+    }
+
+    public ModuleConfiguration redisPublishMetrcisPrefix(String redisPublishMetrcisPrefix) {
+        this.redisPublishMetrcisPrefix = redisPublishMetrcisPrefix;
+        return this;
+    }
+
+    public ModuleConfiguration redisPublishMetrcisRefreshPeriodSec(int redisPublishMetrcisRefreshPeriodSec) {
+        this.redisPublishMetrcisRefreshPeriodSec = redisPublishMetrcisRefreshPeriodSec;
+        return this;
+    }
+
     public ModuleConfiguration redisPassword(String redisPassword) {
         this.redisPassword = redisPassword;
         return this;
@@ -341,6 +359,22 @@ public String getRedisAuth() {
         return redisAuth;
     }
 
+    public String getRedisPublishMetrcisAddress() {
+        return redisPublishMetrcisAddress;
+    }
+
+    public String getRedisPublishMetrcisPrefix() {
+        return redisPublishMetrcisPrefix;
+    }
+
+    public int getRedisPublishMetrcisRefreshPeriodSec() {
+        if (redisPublishMetrcisRefreshPeriodSec < 1) {
+            log.debug("Ignoring value {}s for redisPublishMetrcisRefreshPersiodSec (too small) and use 1 instead", redisPublishMetrcisRefreshPeriodSec);
+            return 1;
+        }
+        return redisPublishMetrcisRefreshPeriodSec;
+    }
+
     public String getRedisPassword() {
         return redisPassword;
     }

src/main/java/org/swisspush/reststorage/util/ResourcesUtils.java

@@ -0,0 +1,48 @@
+package org.swisspush.reststorage.util;
+
+import com.google.common.base.Charsets;
+import com.google.common.io.Resources;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.net.URL;
+
+/**
+ * <p>
+ * Utility class providing handy methods to deal with Resources.
+ * </p>
+ *
+ * @author https://github.com/mcweba [Marc-Andre Weber]
+ */
+public class ResourcesUtils {
+
+    private static Logger log = LoggerFactory.getLogger(ResourcesUtils.class);
+
+    private ResourcesUtils() {
+        // prevent instantiation
+    }
+
+    /**
+     * <p>
+     * Loads the resource with the provided name from the classpath. When param {@code exceptionWhenNotFound}
+     * set to true, a {@link RuntimeException} is thrown when the resource cannot be loaded.
+     * </p>
+     *
+     * @param resourceName the name of the resource to load
+     * @param exceptionWhenNotFound throw a {@link RuntimeException} when the resource could not be loaded
+     * @throws RuntimeException when {@code exceptionWhenNotFound} is set to true and resource cannot be loaded
+     * @return The content of the resource or null
+     */
+    public static String loadResource(String resourceName, boolean exceptionWhenNotFound) {
+        try {
+            URL url = Resources.getResource(resourceName);
+            return Resources.toString(url, Charsets.UTF_8);
+        } catch (Exception e) {
+            log.error("Error loading resource '"+resourceName+"'", e);
+            if(exceptionWhenNotFound){
+                throw new RuntimeException("Error loading required resource '"+resourceName+"'");
+            }
+            return null;
+        }
+    }
+}