1 files changed, 190 insertions, 0 deletions
diff --git a/rulemgt/src/main/java/org/onap/holmes/rulemgt/dcae/ConfigFileScanningTask.java b/rulemgt/src/main/java/org/onap/holmes/rulemgt/dcae/ConfigFileScanningTask.java
new file mode 100644
index 0000000..9f7b89f
--- /dev/null
+++ b/rulemgt/src/main/java/org/onap/holmes/rulemgt/dcae/ConfigFileScanningTask.java
@@ -0,0 +1,190 @@
+/**
+ * Copyright 2021 ZTE Corporation.
+ * <p>
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.onap.holmes.rulemgt.dcae;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import org.apache.commons.lang.StringUtils;
+import org.onap.holmes.common.ConfigFileScanner;
+import org.onap.holmes.common.utils.FileUtils;
+import org.onap.holmes.common.utils.JerseyClient;
+import org.onap.holmes.rulemgt.bean.request.RuleCreateRequest;
+import org.onap.holmes.rulemgt.bean.response.RuleQueryListResponse;
+import org.onap.holmes.rulemgt.bean.response.RuleResult4API;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.ws.rs.client.Entity;
+import javax.ws.rs.core.MediaType;
+import java.io.File;
+import java.nio.file.Paths;
+import java.util.*;
+
+public class ConfigFileScanningTask implements Runnable {
+    final public static long POLLING_PERIOD = 30L;
+    final private static Logger LOGGER = LoggerFactory.getLogger(ConfigFileScanningTask.class);
+    final private static long FILE_SIZE_LMT = 1024 * 1024 * 10; // 10MB
+    final private Map<String, String> configInEffect = new HashMap(); // Contents for configInEffect are <closedControlLoop>:<ruleContents> pairs.
+    private String configFile = "/opt/hrmrules/index.json";
+    private ConfigFileScanner configFileScanner;
+    private String url = "https://127.0.0.1:9101/api/holmes-rule-mgmt/v1/rule";
+
+    public ConfigFileScanningTask(ConfigFileScanner configFileScanner) {
+        this.configFileScanner = configFileScanner;
+    }
+
+    @Override
+    public void run() {
+        if (null == configFileScanner) {
+            configFileScanner = new ConfigFileScanner();
+        }
+        Map<String, String> newConfig = extractConfigItems(configFileScanner.scan(configFile));
+
+        List<RuleResult4API> deployedRules = getExistingRules();
+
+        // deal with newly added rules
+        final Set<String> existingKeys = new HashSet(configInEffect.keySet());
+        final Set<String> newKeys = new HashSet(newConfig.keySet());
+        newKeys.stream()
+                .filter(key -> !existingKeys.contains(key))
+                .forEach(key -> {
+                    if (deployRule(key, newConfig.get(key))) {
+                        configInEffect.put(key, newConfig.get(key));
+                        LOGGER.info("Rule '{}' has been deployed.", key);
+                    }
+                });
+
+        // deal with removed rules
+        existingKeys.stream().filter(key -> !newKeys.contains(key)).forEach(key -> {
+            if (deleteRule(find(deployedRules, key))) {
+                configInEffect.remove(key);
+                LOGGER.info("Rule '{}' has been removed.", key);
+            }
+        });
+
+        // deal with changed rules
+        existingKeys.stream().filter(key -> newKeys.contains(key)).forEach(key -> {
+            if (changed(configInEffect.get(key), newConfig.get(key))) {
+                if (deleteRule(find(deployedRules, key))) {
+                    configInEffect.remove(key);
+                    deployRule(key, newConfig.get(key));
+                    configInEffect.put(key, newConfig.get(key));
+                    LOGGER.info("Rule '{}' has been updated.", key);
+                }
+            }
+        });
+    }
+
+    private Map<String, String> extractConfigItems(Map<String, String> configFiles) {
+        Map<String, String> ret = new HashMap();
+        for (Map.Entry entry : configFiles.entrySet()) {
+            JsonArray ja = JsonParser.parseString(entry.getValue().toString()).getAsJsonArray();
+            Iterator<JsonElement> iterator = ja.iterator();
+            while (iterator.hasNext()) {
+                JsonObject jo = iterator.next().getAsJsonObject();
+                String contents = readFile(jo.get("file").getAsString());
+                if (StringUtils.isNotBlank(contents)) {
+                    ret.put(jo.get("closedControlLoopName").getAsString(), contents);
+                }
+            }
+        }
+        return ret;
+    }
+
+    private String normalizePath(String path) {
+        if (!path.startsWith("/")) {
+            return Paths.get(new File(configFile).getParent(), path).toString();
+        }
+        return path;
+    }
+    private String readFile(String path) {
+        String finalPath = normalizePath(path);
+        File file = new File(finalPath);
+        if (file.exists() && !file.isDirectory() && file.length() <= FILE_SIZE_LMT) {
+            return FileUtils.readTextFile(finalPath);
+        } else {
+            LOGGER.warn("The file {} does not exist or it is a directory or it is too large to load.", finalPath);
+        }
+        return null;
+    }
+
+    private RuleResult4API find(final List<RuleResult4API> rules, String clName) {
+        for (RuleResult4API rule : rules) {
+            if (rule.getLoopControlName().equals(clName)) {
+                return rule;
+            }
+        }
+        return null;
+    }
+
+    private boolean changed(String con1, String con2) {
+        // if either of the arguments is null, consider it as invalid and unchanged
+        if (con1 == null || con2 == null) {
+            return false;
+        }
+
+        if (!con1.replaceAll("\\s", StringUtils.EMPTY)
+                .equals(con2.replaceAll("\\s", StringUtils.EMPTY))) {
+            return true;
+        }
+
+        return false;
+    }
+
+    private List<RuleResult4API> getExistingRules() {
+        RuleQueryListResponse ruleQueryListResponse = JerseyClient.newInstance().get(url, RuleQueryListResponse.class);
+        List<RuleResult4API> deployedRules = Collections.EMPTY_LIST;
+        if (null != ruleQueryListResponse) {
+            deployedRules = ruleQueryListResponse.getCorrelationRules();
+        }
+        return deployedRules;
+    }
+
+    private boolean deployRule(String clName, String contents) {
+        RuleCreateRequest ruleCreateRequest = getRuleCreateRequest(clName, contents);
+        if (JerseyClient.newInstance().header("Accept", MediaType.APPLICATION_JSON)
+                .put(url, Entity.json(ruleCreateRequest)) == null) {
+            LOGGER.error("Failed to deploy rule: {}.", clName);
+            return false;
+        }
+        return true;
+    }
+
+    private RuleCreateRequest getRuleCreateRequest(String clName, String contents) {
+        RuleCreateRequest ruleCreateRequest = new RuleCreateRequest();
+        ruleCreateRequest.setLoopControlName(clName);
+        ruleCreateRequest.setRuleName(clName);
+        ruleCreateRequest.setContent(contents);
+        ruleCreateRequest.setDescription("");
+        ruleCreateRequest.setEnabled(1);
+        return ruleCreateRequest;
+    }
+
+    private boolean deleteRule(RuleResult4API rule) {
+        if (rule == null) {
+            LOGGER.info("No rule found, nothing to delete.");
+            return false;
+        }
+        if (null == JerseyClient.newInstance().delete(url + "/" + rule.getRuleId())) {
+            LOGGER.warn("Failed to delete rule, the rule id is: {}", rule.getRuleId());
+            return false;
+        }
+        return true;
+    }
+}