com.artipie.debian.metadata.Package Maven / Gradle / Ivy
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/*
* The MIT License (MIT)
*
* Copyright (c) 2020 Artipie
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.artipie.debian.metadata;
import com.artipie.asto.Content;
import com.artipie.asto.Copy;
import com.artipie.asto.Key;
import com.artipie.asto.Storage;
import com.artipie.asto.fs.FileStorage;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UncheckedIOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.concurrent.CompletionStage;
import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
import org.apache.commons.compress.compressors.gzip.GzipCompressorOutputStream;
import org.apache.commons.io.FileUtils;
import org.cactoos.list.ListOf;
/**
* Package index.
* @since 0.1
*/
public interface Package {
/**
* Adds item to the packages index.
* @param items Index items to add
* @param index Package index key
* @return Completion action
*/
CompletionStage add(Iterable items, Key index);
/**
* Simple {@link Package} implementation: it appends item to the index without any validation.
* @since 0.1
* @checkstyle ClassDataAbstractionCouplingCheck (100 lines)
*/
final class Asto implements Package {
/**
* Package index items separator.
*/
private static final String SEP = "\n\n";
/**
* Abstract storage.
*/
private final Storage asto;
/**
* Ctor.
* @param asto Storage
*/
public Asto(final Storage asto) {
this.asto = asto;
}
@Override
public CompletionStage add(final Iterable items, final Key index) {
final byte[] bytes = String.join(Asto.SEP, items).getBytes(StandardCharsets.UTF_8);
return this.asto.exists(index).thenCompose(
exists -> {
final CompletionStage res;
if (exists) {
try {
final Path temp = Files.createTempDirectory("packages-");
final Path latest = Files.createTempFile(temp, "latest-", ".gz");
res = new Copy(this.asto, new ListOf<>(index))
.copy(new FileStorage(temp))
.thenAccept(
nothing -> decompressAppendCompress(
temp.resolve(index.string()), latest, bytes
)
).thenCompose(
nothing -> new FileStorage(temp)
.move(new Key.From(latest.getFileName().toString()), index)
).thenCompose(
nothing -> new Copy(new FileStorage(temp), new ListOf<>(index))
.copy(this.asto)
).thenAccept(nothing -> FileUtils.deleteQuietly(temp.toFile()));
} catch (final IOException err) {
throw new IllegalStateException("Failed to create temp dir", err);
}
} else {
res = this.asto.save(index, new Content.From(compress(bytes)));
}
return res;
}
);
}
/**
* Decompresses Packages.gz file, appends information and writes compressed result
* into new file.
* @param decompress File to decompress
* @param res Where to write the result
* @param append New bytes to append
*/
@SuppressWarnings("PMD.AssignmentInOperand")
private static void decompressAppendCompress(
final Path decompress, final Path res, final byte[] append
) {
try (
OutputStream baos = new BufferedOutputStream(Files.newOutputStream(res));
GzipCompressorInputStream gcis = new GzipCompressorInputStream(
new BufferedInputStream(Files.newInputStream(decompress))
);
GzipCompressorOutputStream gcos =
new GzipCompressorOutputStream(new BufferedOutputStream(baos))
) {
// @checkstyle MagicNumberCheck (1 line)
final byte[] buf = new byte[1024];
int cnt;
while (-1 != (cnt = gcis.read(buf))) {
gcos.write(buf, 0, cnt);
}
gcos.write(Asto.SEP.getBytes(StandardCharsets.UTF_8));
gcos.write(append);
} catch (final IOException err) {
throw new UncheckedIOException(err);
}
}
/**
* Compress text for new Package index.
* @param bytes Bytes to compress
* @return Compressed bytes
*/
private static byte[] compress(final byte[] bytes) {
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
try (GzipCompressorOutputStream gcos =
new GzipCompressorOutputStream(new BufferedOutputStream(baos))
) {
gcos.write(bytes);
} catch (final IOException err) {
throw new UncheckedIOException(err);
}
return baos.toByteArray();
}
}
}