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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.vespa.hosted.node.admin.task.util;
import com.yahoo.vespa.hosted.node.admin.component.TaskContext;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import java.util.logging.Logger;
import static com.yahoo.vespa.hosted.node.admin.task.util.file.IOExceptionUtil.ifExists;
import static com.yahoo.yolean.Exceptions.uncheck;
import static java.nio.file.StandardCopyOption.ATOMIC_MOVE;
import static java.util.stream.Collectors.joining;
/**
* Rewrites default-env.txt files.
*
* @author bjorncs
*/
public class DefaultEnvWriter {
private static final Logger logger = Logger.getLogger(DefaultEnvWriter.class.getName());
private final Map<String, Operation> operations = new LinkedHashMap<>();
public DefaultEnvWriter addOverride(String name, String value) {
return addOperation("override", name, value);
}
public DefaultEnvWriter addFallback(String name, String value) {
return addOperation("fallback", name, value);
}
public DefaultEnvWriter addUnset(String name) {
return addOperation("unset", name, null);
}
private DefaultEnvWriter addOperation(String action, String name, String value) {
if (operations.containsKey(name)) {
throw new IllegalArgumentException(String.format("Operation on variable '%s' already added", name));
}
operations.put(name, new Operation(action, name, value));
return this;
}
/**
* Updates or created a default-env.txt file
*
* @return true if the file was modified
*/
public boolean updateFile(TaskContext context, Path defaultEnvFile) {
List<String> currentDefaultEnvLines = ifExists(() -> Files.readAllLines(defaultEnvFile)).orElse(List.of());
List<String> newDefaultEnvLines = generateContent(currentDefaultEnvLines);
if (currentDefaultEnvLines.equals(newDefaultEnvLines)) {
return false;
} else {
context.log(logger, "Updating " + defaultEnvFile.toString());
Path tempFile = defaultEnvFile.resolveSibling(defaultEnvFile.getFileName() + ".tmp");
uncheck(() -> Files.write(tempFile, newDefaultEnvLines));
uncheck(() -> Files.move(tempFile, defaultEnvFile, ATOMIC_MOVE));
return true;
}
}
/**
* @return generated default-env.txt content
*/
public String generateContent() {
return generateContent(List.of()).stream()
.collect(joining(System.lineSeparator(), "", System.lineSeparator()));
}
private List<String> generateContent(List<String> currentDefaultEnvLines) {
List<String> newDefaultEnvLines = new ArrayList<>();
Set<String> seenNames = new TreeSet<>();
for (String line : currentDefaultEnvLines) {
String[] items = line.split(" ");
if (items.length < 2) {
throw new IllegalArgumentException(String.format("Invalid line in file '%s': %s", currentDefaultEnvLines, line));
}
String name = items[1];
if (!seenNames.contains(name)) { // implicitly removes duplicated variables
seenNames.add(name);
Operation operation = operations.get(name);
if (operation != null) {
newDefaultEnvLines.add(operation.toLine());
} else {
newDefaultEnvLines.add(line);
}
}
}
for (var operation : operations.values()) {
if (!seenNames.contains(operation.name)) {
newDefaultEnvLines.add(operation.toLine());
}
}
return newDefaultEnvLines;
}
private record Operation(String action, String name, String value) {
String toLine() {
if (action.equals("unset")) {
return "unset " + name;
}
return action + " " + name + " " + value;
}
}
}
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