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package org.openslx.virtualization.configuration.container;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.stream.JsonReader;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.openslx.util.Util;
import org.openslx.util.TarArchiveUtil.TarArchiveReader;
import org.openslx.util.TarArchiveUtil.TarArchiveWriter;
import java.io.*;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.Objects;
public class ContainerDefinition {
// TODO database needs a refactoring to store container details
// TODO refatoring: tar.gz of this object is not useful, for smaller dockerfiles it makes the package lager.
// remove the containerRecipe, ContainerMeta holds in build_context the dockerfile.
protected static final Logger LOGGER = LogManager.getLogger(ContainerDefinition.class);
protected static final String CONTAINER_FILE = "dockerfile";
protected static final String CONTAINER_META_FILE = "container_meta.json";
/**
* The file to construct a real container image, could be an dockerfile or a singularity recipe.
*/
public String containerRecipe = "";
/**
* Further container information, see {@link ContainerMeta}.
*/
public ContainerMeta containerMeta;
public ContainerDefinition() {
containerMeta = new ContainerMeta();
}
/**
* Copy Constructor
*
* @param containerDef {@link ContainerDefinition} from which to make a deep copy.
*/
public ContainerDefinition(ContainerDefinition containerDef) {
containerRecipe = String.valueOf(containerDef.getContainerRecipe());
containerMeta = new ContainerMeta(containerDef.getContainerMeta());
}
/**
* Utility function to create a {@link ContainerDefinition} object for a byte array downloaded from the server.
*
* @param rawTarData Downloaded tar.gz file from the server as a byte array.
* @return New object of ContainerDefinition.
*/
public static ContainerDefinition fromByteArray(byte[] rawTarData) {
ContainerDefinition containerDef = new ContainerDefinition();
try {
TarArchiveReader tarReader = new TarArchiveReader(new ByteArrayInputStream(rawTarData), true, true);
while (tarReader.hasNextEntry()) {
if (tarReader.getEntryName().equals(CONTAINER_FILE))
containerDef.setContainerRecipe(tarReader.readCurrentEntry());
if (tarReader.getEntryName().equals(CONTAINER_META_FILE))
containerDef.setContainerMeta(tarReader.readCurrentEntry());
}
tarReader.close();
} catch (IOException e) {
LOGGER.error("Could not create a ContainerDefinition Object for rawTarData", e);
}
return containerDef;
}
public String getContainerRecipe() {
return containerRecipe;
}
public void setContainerRecipe(String containerRecipe) {
this.containerRecipe = containerRecipe;
}
public void setContainerRecipe(File containerRecipeFile) {
this.containerRecipe = readContainerRecipe(containerRecipeFile);
}
public void setContainerRecipe(byte[] rawContainerRecipe) {
this.containerRecipe = new String(rawContainerRecipe, StandardCharsets.UTF_8);
}
public ContainerMeta getContainerMeta() {
return containerMeta;
}
public void setContainerMeta(byte[] containerMeta) {
Gson gson = new GsonBuilder().create();
this.containerMeta = gson.fromJson(new JsonReader(
new InputStreamReader(new ByteArrayInputStream(containerMeta), StandardCharsets.UTF_8)),
ContainerMeta.class);
}
/**
* Serializes the ContainerMeta and Container Description (e.g. dockerfile) into an tar.gz archive.
*
* @return A ByteBuffer object of the container definition. Can be uploaded so satellite server.
*/
public ByteBuffer toByteBuffer() {
ByteBuffer containerDef = null;
Gson gson = new GsonBuilder().setPrettyPrinting().create();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
TarArchiveWriter tarWriter = new TarArchiveWriter(baos);
tarWriter.writeFile(CONTAINER_META_FILE, gson.toJson(containerMeta));
tarWriter.writeFile(CONTAINER_FILE, containerRecipe);
Util.safeClose(tarWriter);
containerDef = ByteBuffer.wrap(baos.toByteArray());
} catch (IOException e) {
LOGGER.warn("Could not create a tar file", e);
}
return containerDef;
}
private String readContainerRecipe(File file) {
String recipe = null;
try {
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
ByteArrayOutputStream rawFile = new ByteArrayOutputStream();
int count;
byte[] data = new byte[1024];
while ((count = bis.read(data)) != -1) {
rawFile.write(data, 0, count);
}
String rawRecipe = new String(rawFile.toByteArray(), StandardCharsets.UTF_8);
// replace windows by unix EOL
recipe = rawRecipe.replaceAll("\\r\\n", "\n");
bis.close();
} catch (IOException e) {
LOGGER.error("Could not read Container Recipe", e);
}
return recipe;
}
/**
* Saves containerRecipe and containerMeta at the provided location.
*
* @param destDir destination directory for containerRecipe and containerMeta.
*/
public void saveLocal(File destDir) {
writeFile(destDir, containerRecipe, CONTAINER_FILE);
}
private void writeFile(File destDir, String fileContent, String filename) {
File output = new File(destDir, filename);
try {
FileWriter fw = new FileWriter(output);
fw.write(fileContent);
fw.flush();
fw.close();
} catch (IOException e) {
e.printStackTrace();
LOGGER.error("Could not write File", e);
}
}
public ContainerImageContext getContainerImageContext() {
return ContainerImageContext.fromInt(containerMeta.getContainerImageContext());
}
@Override public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
ContainerDefinition that = (ContainerDefinition) o;
return containerRecipe.equals(that.containerRecipe) && containerMeta.equals(that.containerMeta);
}
@Override public int hashCode() {
return Objects.hash(containerRecipe, containerMeta);
}
}
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