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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.node.verification.spec.retrievers;
import com.yahoo.vespa.hosted.node.verification.commons.CommandExecutor;
import com.yahoo.vespa.hosted.node.verification.commons.parser.OutputParser;
import com.yahoo.vespa.hosted.node.verification.commons.parser.ParseInstructions;
import com.yahoo.vespa.hosted.node.verification.commons.parser.ParseResult;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Retrieves memory size, and stores the result in a HardwareInfo instance
*
* @author olaaun
* @author sgrostad
*/
public class MemoryRetriever implements HardwareRetriever {
private static final String MEMORY_INFO_COMMAND = "cat /proc/meminfo";
private static final String SEARCH_WORD = "MemTotal";
private static final String REGEX_SPLIT = ":\\s";
private static final int SEARCH_ELEMENT_INDEX = 0;
private static final int RETURN_ELEMENT_INDEX = 1;
private static final Logger logger = Logger.getLogger(MemoryRetriever.class.getName());
private final HardwareInfo hardwareInfo;
private final CommandExecutor commandExecutor;
public MemoryRetriever(HardwareInfo hardwareInfo, CommandExecutor commandExecutor) {
this.hardwareInfo = hardwareInfo;
this.commandExecutor = commandExecutor;
}
@Override
public void updateInfo() {
try {
List<String> commandOutput = commandExecutor.executeCommand(MEMORY_INFO_COMMAND);
ParseResult parseResult = parseMemInfoFile(commandOutput);
updateMemoryInfo(parseResult);
} catch (IOException e) {
logger.log(Level.WARNING, "Failed to retrieve memory info. ", e);
}
}
ParseResult parseMemInfoFile(List<String> commandOutput) throws IOException {
List<String> searchWords = Collections.singletonList(SEARCH_WORD);
ParseInstructions parseInstructions = new ParseInstructions(SEARCH_ELEMENT_INDEX, RETURN_ELEMENT_INDEX, REGEX_SPLIT, searchWords);
return OutputParser.parseSingleOutput(parseInstructions, commandOutput)
.orElseThrow(() -> new IOException("Failed to parse memory info file."));
}
void updateMemoryInfo(ParseResult parseResult) {
double memory = convertKBToGB(parseResult.getValue());
hardwareInfo.setMinMainMemoryAvailableGb(memory);
}
double convertKBToGB(String totMem) {
String[] split = totMem.split(" ");
double value = Double.parseDouble(split[0]);
double kiloToGiga = 1000000.0;
return value / kiloToGiga;
}
}
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