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/*-
* ========================LICENSE_START=================================
* ONAP : ccsdk oran
* ======================================================================
* Copyright (C) 2022 Nordix Foundation. All rights reserved.
* ======================================================================
* 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.
* ========================LICENSE_END===================================
*/
package org.onap.ccsdk.oran.a1policymanagementservice.datastore;
import com.google.common.base.Strings;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.lang.invoke.MethodHandles;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Stream;
import org.onap.ccsdk.oran.a1policymanagementservice.configuration.ApplicationConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
class FileStore implements DataStore {
private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
ApplicationConfig applicationConfig;
private final String location;
public FileStore(ApplicationConfig applicationConfig, String location) {
this.applicationConfig = applicationConfig;
this.location = location;
}
@Override
public Flux<String> listObjects(String prefix) {
Path root = Path.of(path().toString(), prefix);
if (!root.toFile().exists()) {
root = root.getParent();
}
logger.debug("Listing files in: {}", root);
List<String> result = new ArrayList<>();
try (Stream<Path> stream = Files.walk(root, Integer.MAX_VALUE)) {
stream.forEach(path -> filterListFiles(path, prefix, result));
return Flux.fromIterable(result);
} catch (Exception e) {
logger.warn("Could not list filed in {}, reason; {}", root, e.getMessage());
return Flux.error(e);
}
}
private void filterListFiles(Path path, String prefix, List<String> result) {
if (path.toFile().isFile() && externalName(path).startsWith(prefix)) {
result.add(externalName(path));
} else {
logger.trace("Ignoring file/directory {}, prefix: {}", path, prefix);
}
}
private String externalName(Path path) {
String fullName = path.toString();
String externalName = fullName.substring(path().toString().length());
if (externalName.startsWith("/")) {
externalName = externalName.substring(1);
}
return externalName;
}
@Override
public Mono<byte[]> readObject(String fileName) {
try {
byte[] contents = Files.readAllBytes(path(fileName));
return Mono.just(contents);
} catch (Exception e) {
return Mono.error(e);
}
}
@Override
public Mono<Boolean> deleteObject(String name) {
try {
Files.delete(path(name));
return Mono.just(true);
} catch (Exception e) {
logger.debug("Could not delete file: {}, reason: {}", path(name), e.getMessage());
return Mono.just(false);
}
}
@Override
public Mono<String> createDataStore() {
try {
if (!Strings.isNullOrEmpty(applicationConfig.getVardataDirectory())) {
Files.createDirectories(path());
}
} catch (IOException e) {
logger.error("Could not create directory: {}, reason: {}", path(), e.getMessage());
}
return Mono.just("OK");
}
private Path path(String name) {
return Path.of(path().toString(), name);
}
private Path path() {
return Path.of(applicationConfig.getVardataDirectory(), "database", this.location);
}
@Override
public Mono<String> deleteAllObjects() {
return listObjects("") //
.flatMap(this::deleteObject) //
.collectList() //
.map(o -> "OK");
}
@Override
public Mono<byte[]> writeObject(String fileName, byte[] fileData) {
try {
if (!Strings.isNullOrEmpty(applicationConfig.getVardataDirectory())) {
Files.createDirectories(path(fileName).getParent());
}
File outputFile = path(fileName).toFile();
try (FileOutputStream outputStream = new FileOutputStream(outputFile)) {
outputStream.write(fileData);
}
} catch (IOException e) {
logger.warn("Could not write file: {}, reason; {}", path(fileName), e.getMessage());
}
return Mono.just(fileData);
}
}
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