IGNITE-22530 CDC: Add regex filters for cache names

modules/cdc-ext/src/main/java/org/apache/ignite/cdc/AbstractIgniteCdcStreamer.java

@@ -17,16 +17,19 @@
 
 package org.apache.ignite.cdc;
 
+import java.nio.file.Path;
 import java.util.Iterator;
 import java.util.Set;
 import java.util.stream.Collectors;
+
 import org.apache.ignite.IgniteCheckedException;
 import org.apache.ignite.IgniteException;
 import org.apache.ignite.IgniteLogger;
 import org.apache.ignite.binary.BinaryType;
 import org.apache.ignite.internal.binary.BinaryContext;
 import org.apache.ignite.internal.binary.BinaryMetadata;
 import org.apache.ignite.internal.binary.BinaryTypeImpl;
+import org.apache.ignite.internal.cdc.CdcConsumerEx;
 import org.apache.ignite.internal.processors.metric.MetricRegistryImpl;
 import org.apache.ignite.internal.processors.metric.impl.AtomicLongMetric;
 import org.apache.ignite.internal.util.typedef.F;
@@ -42,7 +45,7 @@
  *
  * @see AbstractCdcEventsApplier
  */
-public abstract class AbstractIgniteCdcStreamer implements CdcConsumer {
+public abstract class AbstractIgniteCdcStreamer implements CdcConsumerEx {
     /** */
     public static final String EVTS_SENT_CNT = "EventsCount";
 
@@ -67,12 +70,24 @@ public abstract class AbstractIgniteCdcStreamer implements CdcConsumer {
     /** */
     public static final String LAST_EVT_SENT_TIME_DESC = "Timestamp of last applied event to destination cluster";
 
+    /** */
+    public static final String DFLT_REGEXP = "";
+
     /** Handle only primary entry flag. */
     private boolean onlyPrimary = DFLT_IS_ONLY_PRIMARY;
 
     /** Cache names. */
     private Set<String> caches;
 
+    /** Regexp manager. */
+    private CdcRegexManager regexManager;
+
+    /** Include regex template for cache names. */
+    private String includeTemplate = DFLT_REGEXP;
+
+    /** Exclude regex template for cache names. */
+    private String excludeTemplate = DFLT_REGEXP;
+
     /** Cache IDs. */
     protected Set<Integer> cachesIds;
 
@@ -100,13 +115,26 @@ public abstract class AbstractIgniteCdcStreamer implements CdcConsumer {
 
     /** {@inheritDoc} */
     @Override public void start(MetricRegistry reg) {
+        //No-op
+    }
+
+    /** {@inheritDoc} */
+    @Override public void start(MetricRegistry reg, Path cdcDir) {
         A.notEmpty(caches, "caches");
 
+        regexManager = new CdcRegexManager(cdcDir, log);
+
         cachesIds = caches.stream()
             .mapToInt(CU::cacheId)
             .boxed()
             .collect(Collectors.toSet());
 
+        regexManager.compileRegexp(includeTemplate, excludeTemplate);
+
+        regexManager.getSavedCaches().stream()
+            .map(CU::cacheId)
+            .forEach(cachesIds::add);
+
         MetricRegistryImpl mreg = (MetricRegistryImpl)reg;
 
         this.evtsCnt = mreg.longMetric(EVTS_SENT_CNT, EVTS_SENT_CNT_DESC);
@@ -144,15 +172,26 @@ public abstract class AbstractIgniteCdcStreamer implements CdcConsumer {
     /** {@inheritDoc} */
     @Override public void onCacheChange(Iterator<CdcCacheEvent> cacheEvents) {
         cacheEvents.forEachRemaining(e -> {
-            // Just skip. Handle of cache events not supported.
+            matchWithRegex(e.configuration().getName());
         });
     }
 
+    /**
+     * Finds match between cache name and user's regex templates.
+     * If match is found, adds this cache's id to id's list.
+     *
+     * @param cacheName Cache name.
+     */
+    private void matchWithRegex(String cacheName) {
+        int cacheId = CU.cacheId(cacheName);
+
+        if (!cachesIds.contains(cacheId) && regexManager.match(cacheName))
+            cachesIds.add(cacheId);
+    }
+
     /** {@inheritDoc} */
     @Override public void onCacheDestroy(Iterator<Integer> caches) {
-        caches.forEachRemaining(e -> {
-            // Just skip. Handle of cache events not supported.
-        });
+        caches.forEachRemaining(regexManager::deleteRegexpCacheIfPresent);
     }
 
     /** {@inheritDoc} */
@@ -238,6 +277,30 @@ public AbstractIgniteCdcStreamer setCaches(Set<String> caches) {
         return this;
     }
 
+    /**
+     * Sets include regex pattern that participates in CDC.
+     *
+     * @param includeTemplate Include regex template
+     * @return {@code this} for chaining.
+     */
+    public AbstractIgniteCdcStreamer setIncludeTemplate(String includeTemplate) {
+        this.includeTemplate = includeTemplate;
+
+        return this;
+    }
+
+    /**
+     * Sets exclude regex pattern that participates in CDC.
+     *
+     * @param excludeTemplate Exclude regex template
+     * @return {@code this} for chaining.
+     */
+    public AbstractIgniteCdcStreamer setExcludeTemplate(String excludeTemplate) {
+        this.excludeTemplate = excludeTemplate;
+
+        return this;
+    }
+
     /**
      * Sets maximum batch size that will be applied to destination cluster.
      *

modules/cdc-ext/src/main/java/org/apache/ignite/cdc/CdcRegexManager.java

@@ -0,0 +1,227 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.ignite.cdc;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.Optional;
+import java.util.regex.Pattern;
+import java.util.regex.PatternSyntaxException;
+import java.util.stream.Collectors;
+
+import org.apache.ignite.IgniteException;
+import org.apache.ignite.IgniteLogger;
+import org.apache.ignite.internal.util.typedef.internal.CU;
+
+import static java.nio.file.StandardCopyOption.ATOMIC_MOVE;
+import static java.nio.file.StandardCopyOption.REPLACE_EXISTING;
+
+/**
+ * Contains logic to process user's regexp patterns for CDC.
+ */
+public class CdcRegexManager {
+
+    /** File with saved names of caches added by cache masks. */
+    private static final String SAVED_CACHES_FILE = "caches";
+
+    /** Temporary file with saved names of caches added by cache masks. */
+    private static final String SAVED_CACHES_TMP_FILE = "caches_tmp";
+
+    /** CDC directory path. */
+    private final Path cdcDir;
+
+    /** Include regex pattern for cache names. */
+    private Pattern includeFilter;
+
+    /** Exclude regex pattern for cache names. */
+    private Pattern excludeFilter;
+
+    /** Logger. */
+    private IgniteLogger log;
+
+    /**
+     *
+     * @param cdcDir Path to Change Data Capture Directory.
+     * @param log Logger.
+     */
+    public CdcRegexManager(Path cdcDir, IgniteLogger log) {
+        this.cdcDir = cdcDir;
+        this.log = log;
+    }
+
+    /**
+     * Finds and processes match between cache name and user's regexp patterns.
+     *
+     * @param cacheName Cache name.
+     * @return True if cache name matches user's regexp patterns.
+     */
+    public boolean match(String cacheName) {
+        return matchAndSave(cacheName);
+    }
+
+    /**
+     * Get actual list of names of caches added by regex templates from cache list file.
+     * Caches that added to replication through regex templates during the work of CDC application,
+     * are saved to file so they can be restored after application restart.
+     *
+     * @return Caches names list.
+     */
+    public List<String> getSavedCaches() {
+        try {
+            return loadCaches().stream()
+                .filter(this::matchesFilters)
+                .collect(Collectors.toList());
+        }
+        catch (IOException e) {
+            throw new IgniteException(e);
+        }
+    }
+
+    /**
+     * Finds match between cache name and user's regex templates.
+     * If match is found, saves cache name to file.
+     *
+     * @param cacheName Cache name.
+     * @return True if cache name matches user's regexp patterns.
+     */
+    private boolean matchAndSave(String cacheName) {
+        if (matchesFilters(cacheName)) {
+            try {
+                List<String> caches = loadCaches();
+
+                caches.add(cacheName);
+
+                save(caches);
+            }
+            catch (IOException e) {
+                throw new IgniteException(e);
+            }
+
+            if (log.isInfoEnabled())
+                log.info("Cache has been added to replication [cacheName=" + cacheName + "]");
+
+            return true;
+        }
+        return false;
+    }
+
+    /**
+     * Matches cache name with compiled regex patterns.
+     *
+     * @param cacheName Cache name.
+     * @return True if cache name matches include pattern and doesn't match exclude pattern.
+     */
+    private boolean matchesFilters(String cacheName) {
+        return includeFilter.matcher(cacheName).matches() && !excludeFilter.matcher(cacheName).matches();
+    }
+
+    /**
+     * Compiles regex patterns from user templates.
+     *
+     * @param includeTemplate Include regex template.
+     * @param excludeTemplate Exclude regex template.
+     * @throws IgniteException If the template's syntax is invalid
+     */
+    public void compileRegexp(String includeTemplate, String excludeTemplate) {
+        try {
+            includeFilter = Pattern.compile(includeTemplate);
+
+            excludeFilter = Pattern.compile(excludeTemplate);
+        }
+        catch (PatternSyntaxException e) {
+            throw new IgniteException("Invalid cache regexp template.", e);
+        }
+    }
+
+    /**
+     * Loads saved CDC caches from file. If file not found, creates a new one containing empty list.
+     *
+     * @return List of saved caches names.
+     */
+    private List<String> loadCaches() throws IOException {
+        if (cdcDir == null) {
+            throw new IgniteException("Can't load '" + SAVED_CACHES_FILE + "' file. Cdc directory is null");
+        }
+        Path savedCachesPath = cdcDir.resolve(SAVED_CACHES_FILE);
+
+        if (Files.notExists(savedCachesPath)) {
+            Files.createFile(savedCachesPath);
+
+            if (log.isInfoEnabled())
+                log.info("Cache list created: " + savedCachesPath);
+        }
+
+        return Files.readAllLines(savedCachesPath);
+    }
+
+    /**
+     * Writes caches list to file.
+     *
+     * @param caches Caches list.
+     */
+    private void save(List<String> caches) throws IOException {
+        if (cdcDir == null) {
+            throw new IgniteException("Can't write to '" + SAVED_CACHES_FILE + "' file. Cdc directory is null");
+        }
+        Path savedCachesPath = cdcDir.resolve(SAVED_CACHES_FILE);
+        Path tmpSavedCachesPath = cdcDir.resolve(SAVED_CACHES_TMP_FILE);
+
+        StringBuilder cacheList = new StringBuilder();
+
+        for (String cache : caches) {
+            cacheList.append(cache);
+
+            cacheList.append('\n');
+        }
+
+        Files.write(tmpSavedCachesPath, cacheList.toString().getBytes());
+
+        Files.move(tmpSavedCachesPath, savedCachesPath, ATOMIC_MOVE, REPLACE_EXISTING);
+    }
+
+    /**
+     * Removes cache added by regexp from cache list if such cache is present in file to prevent disk space overflow.
+     *
+     * @param cacheId Cache id.
+     */
+    public void deleteRegexpCacheIfPresent(Integer cacheId) {
+        try {
+            List<String> caches = loadCaches();
+
+            Optional<String> cacheName = caches.stream()
+                .filter(name -> CU.cacheId(name) == cacheId)
+                .findAny();
+
+            if (cacheName.isPresent()) {
+                String name = cacheName.get();
+
+                caches.remove(name);
+
+                save(caches);
+
+                if (log.isInfoEnabled())
+                    log.info("Cache has been removed from replication [cacheName=" + name + ']');
+            }
+        }
+        catch (IOException e) {
+            throw new IgniteException(e);
+        }
+    }
+}

modules/cdc-ext/src/main/java/org/apache/ignite/cdc/IgniteToIgniteCdcStreamer.java

@@ -17,6 +17,8 @@
 
 package org.apache.ignite.cdc;
 
+import java.nio.file.Path;
+
 import org.apache.ignite.IgniteException;
 import org.apache.ignite.Ignition;
 import org.apache.ignite.cdc.conflictresolve.CacheVersionConflictResolverImpl;
@@ -59,8 +61,8 @@ public class IgniteToIgniteCdcStreamer extends AbstractIgniteCdcStreamer impleme
     private volatile boolean alive = true;
 
     /** {@inheritDoc} */
-    @Override public void start(MetricRegistry mreg) {
-        super.start(mreg);
+    @Override public void start(MetricRegistry mreg, Path cdcDir) {
+        super.start(mreg, cdcDir);
 
         if (log.isInfoEnabled())
             log.info("Ignite To Ignite Streamer [cacheIds=" + cachesIds + ']');