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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config.subscription.impl;
import com.yahoo.config.ConfigInstance;
import com.yahoo.config.ConfigurationRuntimeException;
import com.yahoo.config.subscription.CfgConfigPayloadBuilder;
import com.yahoo.config.subscription.ConfigInterruptedException;
import com.yahoo.io.IOUtils;
import com.yahoo.vespa.config.ConfigKey;
import com.yahoo.vespa.config.ConfigPayload;
import com.yahoo.vespa.config.PayloadChecksums;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;
/**
* Subscription to use when config id is jar:.../foo.jar[!/pathInJar/]
*
* @author Vegard Havdal
* @author gjoranv
*/
public class JarConfigSubscription<T extends ConfigInstance> extends ConfigSubscription<T> {
private final String jarName;
private final String path;
private ZipEntry zipEntry = null;
// jar:configs/app.jar!/configs/
JarConfigSubscription(ConfigKey<T> key, String jarName, String path) {
super(key);
this.jarName = jarName;
this.path = path;
}
@Override
public boolean nextConfig(long timeout) {
if (checkReloaded()) {
// Not supporting changing the payload for jar
return true;
}
if (zipEntry == null) {
// First time polled
JarFile jarFile;
try {
jarFile = new JarFile(jarName);
} catch (IOException e) {
throw new IllegalArgumentException(e);
}
zipEntry = getEntry(jarFile, path);
if (zipEntry == null)
throw new IllegalArgumentException("Config '" + key.getName() + "' not found in '" + jarName + "!/" + path + "'.");
T config;
try {
ConfigPayload payload = new CfgConfigPayloadBuilder().deserialize(Arrays.asList(IOUtils.readAll(new InputStreamReader(jarFile.getInputStream(zipEntry), StandardCharsets.UTF_8)).split("\n")));
config = payload.toInstance(configClass, key.getConfigId());
} catch (UnsupportedEncodingException e) {
throw new IllegalStateException(e);
} catch (IOException e) {
throw new ConfigurationRuntimeException(e);
}
setConfig(0L, false, config, PayloadChecksums.empty());
try {
jarFile.close();
} catch (IOException e) {
throw new ConfigurationRuntimeException(e);
}
return true;
}
// TODO: Should wait and detect changes
try {
Thread.sleep(timeout);
} catch (InterruptedException e) {
throw new ConfigInterruptedException(e);
}
return false;
}
/**
* Returns the entry corresponding to the ConfigInstance's defName in the given directory in
* the given jar file.
* The file's existence is checked elsewhere.
*/
private ZipEntry getEntry(JarFile jarFile, String dir) {
if (!dir.endsWith("/")) {
dir = dir + '/';
}
return jarFile.getEntry(dir + getConfigFilename(key));
}
@Override
public boolean subscribe(long timeout) {
return true;
}
}
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