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// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.server.zookeeper;
import com.yahoo.io.reader.NamedReader;
import com.yahoo.path.Path;
import java.io.Reader;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Responsible for providing data from an application subtree in zookeeper.
* (i.e. /config/v2/tenants/x/session/<session id for an application>/).
*
* @author Tony Vaagenes
*/
public class ZKApplication {
private final ConfigCurator zk;
private final Path appPath;
ZKApplication(ConfigCurator zk, Path appPath) {
this.zk = zk;
this.appPath = appPath;
}
/**
* Returns a list of the files (as readers) in the given path. The readers <b>must</b>
* be closed by the caller.
*
* @param path a path relative to the session
* (i.e. /config/v2/tenants/x/sessions/<session id>/).
* @param fileNameSuffix the suffix of files to return, or null to return all
* @param recursive if true, all files from all subdirectories of this will also be returned
* @return the files in the given path, or an empty list if the directory does not exist or is empty.
* The list gets owned by the caller and can be modified freely.
*/
List<NamedReader> getAllDataFromDirectory(String path, String fileNameSuffix, boolean recursive) {
return getAllDataFromDirectory(path, "", fileNameSuffix, recursive);
}
/**
* As above, except
*
* @param namePrefix the prefix to prepend to the returned reader names
*/
private List<NamedReader> getAllDataFromDirectory(String path, String namePrefix, String fileNameSuffix, boolean recursive) {
String fullPath = getFullPath(path);
List<NamedReader> result = new ArrayList<>();
List<String> children = getChildren(path);
try {
for (String child : children) {
if (fileNameSuffix == null || child.endsWith(fileNameSuffix)) {
result.add(new NamedReader(namePrefix + child, reader(zk.getData(fullPath, child))));
}
if (recursive)
result.addAll(getAllDataFromDirectory(path + "/" + child,
namePrefix + child + "/", fileNameSuffix, recursive));
}
return result;
} catch (Exception e) {
throw new RuntimeException("Could not retrieve all data from '" + fullPath + "' in zookeeper", e);
}
}
/**
* Retrieves a node relative to the node of the live application
*
* @param path a path relative to the currently active application
* @param node a path relative to the path above
* @return a Reader that can be used to get the data
*/
Reader getDataReader(String path, String node) {
return reader(getData(path, node));
}
public String getData(String path, String node) {
if ( ! exists(path, node)) throw new IllegalArgumentException("No node for " + getFullPath(path) + "/" + node + " exists");
try {
return zk.getData(getFullPath(path), node);
} catch (Exception e) {
throw new IllegalArgumentException("Could not retrieve node '" +
getFullPath(path) + "/" + node + "' in zookeeper", e);
}
}
public String getData(String path) {
if ( ! exists(path)) throw new IllegalArgumentException("No node for " + getFullPath(path) + " exists");
try {
return zk.getData(getFullPath(path));
} catch (RuntimeException e) {
throw new IllegalArgumentException("Could not retrieve path '" + getFullPath(path) + "' in zookeeper", e);
}
}
public byte[] getBytes(String path) {
try {
return zk.getBytes(getFullPath(path));
} catch (RuntimeException e) {
throw new IllegalArgumentException("Could not retrieve path '" + getFullPath(path) + "' in zookeeper", e);
}
}
void putData(String path, String data) {
try {
zk.putData(getFullPath(path), data);
} catch (RuntimeException e) {
throw new IllegalArgumentException("Could not put data to node '" + getFullPath(path) + "' in zookeeper", e);
}
}
/**
* Checks if the given node exists under path under this live app
*
* @param path a zookeeper path
* @param node a zookeeper node
* @return true if the node exists in the path, false otherwise
*/
public boolean exists(String path, String node) {
return zk.exists(getFullPath(path), node);
}
/**
* Checks if the given node exists under path under this live app
*
* @param path a zookeeper path
* @return true if the node exists in the path, false otherwise
*/
public boolean exists(String path) {
return zk.exists(getFullPath(path));
}
private String getFullPath(String path) {
Path fullPath = appPath;
if (path != null) {
fullPath = appPath.append(path);
}
return fullPath.getAbsolute();
}
/**
* Recursively delete given path
*
* @param path path to delete
*/
void deleteRecurse(String path) {
zk.deleteRecurse(getFullPath(path));
}
/**
* Returns the full list of children (file names) in the given path.
*
* @param path a path relative to the currently active application
* @return a list of file names, which is empty (never null) if the path does not exist
*/
public List<String> getChildren(String path) {
String fullPath = getFullPath(path);
if (! zk.exists(fullPath)) return Collections.emptyList();
return zk.getChildren(fullPath);
}
private static Reader reader(String string) {
return new StringReader(string);
}
public void create(String path) {
if (path != null && !path.startsWith("/")) path = "/" + path;
try {
zk.createNode(getFullPath(path));
} catch (RuntimeException e) {
throw new IllegalArgumentException(e);
}
}
Reader getDataReader(String path) {
String data = getData(path);
if (data == null)
throw new IllegalArgumentException("No node for " + getFullPath(path) + " exists");
return reader(data);
}
}
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