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package org.onap.sdc.dcae.ves;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonIOException;
import com.google.gson.JsonSyntaxException;
import com.google.gson.reflect.TypeToken;
import org.apache.commons.lang.ArrayUtils;
import org.apache.commons.lang.StringUtils;
import org.onap.sdc.common.onaplog.OnapLoggerDebug;
import org.onap.sdc.common.onaplog.OnapLoggerError;
import org.onap.sdc.common.onaplog.Enums.LogLevel;
import org.springframework.stereotype.Service;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import java.io.*;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
@Service("vesstructureloader")
public class VesStructureLoader {
private static OnapLoggerError errLogger = OnapLoggerError.getInstance();
private static OnapLoggerDebug debugLogger = OnapLoggerDebug.getInstance();
private static Map<String, EventListenerDefinition> eventListeners = new HashMap<>();
private static final Type type = new TypeToken<VesDataItemsDefinition>(){}.getType();
private static final Gson gson = new GsonBuilder().registerTypeAdapter(type, new VesJsonDeserializer()).create();
private static final String SCHEMA_NAME_PREFIX = "CommonEventFormat_v";
private static final String SCHEMA_NAME_SUFFIX = ".json";
private VesStructureLoader() {
}
@PostConstruct public void init() {
debugLogger.log(LogLevel.DEBUG, this.getClass().getName(), "VesStructureLoader: Trying to load json schemas");
String jettyBase = System.getProperty("jetty.base");
if (jettyBase == null) {
String msg = "Couldn't resolve jetty.base environmental variable";
errLogger.log(LogLevel.ERROR, this.getClass().getName(), msg);
throw new IllegalArgumentException(msg + ". Failed to load VES schema files... aborting");
}
debugLogger.log(LogLevel.DEBUG, this.getClass().getName(), "jetty.base={}", jettyBase);
File dir = new File(jettyBase + "/config/dcae-be/ves-schema");
File[] files = dir.listFiles((dir1, name) -> name.startsWith(SCHEMA_NAME_PREFIX) && name.endsWith(SCHEMA_NAME_SUFFIX));
if (ArrayUtils.isEmpty(files)) {
errLogger.log(LogLevel.ERROR, this.getClass().getName(), "Error – Failed to find VES Schema definitions.");
} else {
for (File f : files) {
debugLogger.log(LogLevel.DEBUG, this.getClass().getName(), "Loading VES schema file: {}", f.getName());
parseJsonFileAndSaveToMap(f);
}
}
}
private void parseJsonFileAndSaveToMap(File file) {
try {
EventListenerDefinition eventListener = gson.fromJson(new FileReader(file), EventListenerDefinition.class);
debugLogger.log(LogLevel.DEBUG, this.getClass().getName(), gson.toJson(eventListener));
String validationError = getValidatorMessage(eventListener);
if (StringUtils.isEmpty(validationError)) {
eventListeners.put(getVersionFromFileName(file.getName()), eventListener);
} else {
errLogger.log(LogLevel.ERROR, this.getClass().getName(), "Error: Failed to parse VES schema file {}. [{}]", file.getName(), validationError);
}
} catch (FileNotFoundException | JsonIOException | JsonSyntaxException e) {
errLogger.log(LogLevel.ERROR, this.getClass().getName(), "Error: Failed to parse VES schema file {}. [{}]", file.getName(), e);
}
}
public static Map<String, VesDataTypeDefinition> getEventListenerDefinitionByVersion(String version) {
return eventListeners.get(version).getProperties().get(EventListenerDefinition.EVENT_ROOT).getProperties();
}
public static Set<String> getAvailableVersionsList() {
return eventListeners.keySet();
}
public static Map<String, Set<String>> getAvailableVersionsAndEventTypes() {
return eventListeners.entrySet().stream().collect(Collectors.toMap(Map.Entry::getKey, e -> getEventListenerDefinitionByVersion(e.getKey()).keySet()));
}
public static Set<String> getEventTypeListByVersion(String version) {
return getEventListenerDefinitionByVersion(version).keySet();
}
private String getValidatorMessage(EventListenerDefinition eventListenerDefinition) {
String validationError = eventListenerDefinition.validate();
if (StringUtils.isBlank(validationError)) {
validationError = eventListenerDefinition.resolveRefTypes();
}
return validationError;
}
private String getVersionFromFileName(String fileName) {
return fileName.replace(SCHEMA_NAME_PREFIX, "").replace(SCHEMA_NAME_SUFFIX, "");
}
@PreDestroy
public void preDestroy() {
// why is this method empty?
}
}
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