andreacavalli/FileSponge
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This commit is contained in:
Andrea Cavalli 2021-03-09 00:35:24 +01:00
parent aeba994347
commit f460657753
5 changed files with 141 additions and 41 deletions
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4
pom.xml
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@ -72,12 +72,12 @@
<dependency>
<groupId>io.projectreactor</groupId>
<artifactId>reactor-core</artifactId>
<version>3.4.2</version>
<version>3.4.3</version>
</dependency>
<dependency>
<groupId>io.projectreactor</groupId>
<artifactId>reactor-test</artifactId>
<version>3.4.2</version>
<version>3.4.3</version>
<scope>test</scope>
</dependency>
<dependency>

16
src/main/lombok/org/warp/filesponge/DiskCache.java
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@ -72,7 +72,7 @@ public class DiskCache implements URLsDiskHandler, URLsWriter {
return Optional
.of(new DiskMetadata(
metadata.getSize(),
new BooleanArrayList(DiskMetadata.getBlocksCount(metadata.getSize(), BLOCK_SIZE))
BooleanArrayList.wrap(new boolean[DiskMetadata.getBlocksCount(metadata.getSize(), BLOCK_SIZE)])
))
.map(diskMetadataSerializer::serialize);
}
@ -95,7 +95,7 @@ public class DiskCache implements URLsDiskHandler, URLsWriter {
.map(prevMeta -> {
if (!prevMeta.getDownloadedBlocks().getBoolean(dataBlock.getId())) {
BooleanArrayList bal = prevMeta.getDownloadedBlocks().clone();
bal.add(dataBlock.getId(), true);
bal.set(dataBlock.getId(), true);
return new DiskMetadata(prevMeta.getSize(), bal);
} else {
return prevMeta;
@ -111,7 +111,7 @@ public class DiskCache implements URLsDiskHandler, URLsWriter {
public Flux<DataBlock> requestContent(URL url) {
return requestDiskMetadata(url)
.filter(DiskMetadata::isDownloadedFully)
.flatMapMany(meta -> Flux.fromIterable(meta.getDownloadedBlocks()))
.flatMapMany(meta -> Flux.fromIterable(meta.getDownloadedBlocks())
.index()
// Get only downloaded blocks
.filter(Tuple2::getT2)
@ -119,13 +119,13 @@ public class DiskCache implements URLsDiskHandler, URLsWriter {
int blockId = Math.toIntExact(blockMeta.getT1());
boolean downloaded = blockMeta.getT2();
if (!downloaded) {
return Mono.empty();
return Mono.<DataBlock>empty();
}
return fileContent.get(null, getBlockKey(url, blockId)).map(data -> {
int blockOffset = getBlockOffset(blockId);
int blockLength = data.length;
if (blockOffset + blockLength >= blockMeta.size()) {
if (blockOffset + blockLength > blockMeta.size()) {
if (blockOffset + blockLength >= meta.getSize()) {
if (blockOffset + blockLength > meta.getSize()) {
throw new IllegalStateException("Overflowed data size");
}
} else if (data.length != BLOCK_SIZE) {
@ -133,13 +133,13 @@ public class DiskCache implements URLsDiskHandler, URLsWriter {
}
return new DataBlock(blockOffset, blockLength, ByteBuffer.wrap(data, 0, blockLength));
});
});
}));
}
private byte[] getBlockKey(URL url, int blockId) {
byte[] urlBytes = url.getSerializer().serialize(url);
byte[] blockIdBytes = Ints.toByteArray(blockId);
byte[] resultBytes = Arrays.copyOf(urlBytes, urlBytes.length);
byte[] resultBytes = Arrays.copyOf(urlBytes, urlBytes.length + blockIdBytes.length);
System.arraycopy(blockIdBytes, 0, resultBytes, urlBytes.length, blockIdBytes.length);
return resultBytes;
}

16
src/main/lombok/org/warp/filesponge/DiskMetadata.java
View File

@ -53,7 +53,9 @@ public class DiskMetadata {
private int getBlocksCount() {
var expectedBlocksCount = getBlocksCount(size, FileSponge.BLOCK_SIZE);
if (this.getDownloadedBlocks().size() != expectedBlocksCount) {
throw new IllegalStateException("Blocks array length != expected blocks count");
throw new IllegalStateException(
"Blocks array length (" + this.getDownloadedBlocks().size()
+ ") != expected blocks count (" + expectedBlocksCount + ")");
}
return expectedBlocksCount;
}
@ -75,22 +77,20 @@ public class DiskMetadata {
var dis = new DataInputStream(bais);
int size = dis.readInt();
int blocksCount = getBlocksCount(size, FileSponge.BLOCK_SIZE);
boolean[] downloadedBlocks = new boolean[blocksCount];
var downloadedBlocks = new BooleanArrayList(blocksCount);
for (int i = 0; i < blocksCount; i++) {
downloadedBlocks[i] = dis.readBoolean();
downloadedBlocks.add(dis.readBoolean());
}
return new DiskMetadata(size, BooleanArrayList.wrap(downloadedBlocks, blocksCount));
return new DiskMetadata(size, downloadedBlocks);
}
@SneakyThrows
@Override
public byte @NotNull [] serialize(@NotNull DiskMetadata deserialized) {
try (var bos = new ByteArrayOutputStream(Integer.BYTES * 2)) {
try (var bos = new ByteArrayOutputStream()) {
try (var dos = new DataOutputStream(bos)) {
dos.writeInt(deserialized.getSize());
if (deserialized.getDownloadedBlocks().size() != deserialized.getBlocksCount()) {
throw new IllegalStateException("Blocks array length != expected blocks count");
}
deserialized.getBlocksCount();
for (boolean downloadedBlock : deserialized.getDownloadedBlocks()) {
dos.writeBoolean(downloadedBlock);
}

37
src/main/lombok/org/warp/filesponge/FileSponge.java
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@ -20,13 +20,17 @@ package org.warp.filesponge;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicBoolean;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
public class FileSponge implements URLsHandler {
public static final int BLOCK_SIZE = 8 * 1024 * 1024; // 8 MiB
public static final int MAX_BLOCKS = 256; // 2 GiB
private static final Logger logger = LoggerFactory.getLogger(FileSponge.class);
public static final int BLOCK_SIZE = 1024 * 1024; // 1 MiB
private final Set<URLsHandler> urlsHandlers = new ConcurrentHashMap<URLsHandler, Object>().keySet(new Object());
@ -50,13 +54,20 @@ public class FileSponge implements URLsHandler {
@Override
public Flux<DataBlock> requestContent(URL url) {
AtomicBoolean alreadyPrintedDebug = new AtomicBoolean(false);
return Flux
.fromIterable(cacheAccess)
.map(urlsHandler -> urlsHandler.requestContent(url))
.collectList()
.flatMapMany(Flux::firstWithValue)
.flatMapMany(monos -> FileSpongeUtils.firstWithValueFlux(monos))
.doOnNext(dataBlock -> {
if (alreadyPrintedDebug.compareAndSet(false, true)) {
logger.debug("File \"{}\" content has been found in the cache", url);
}
})
.switchIfEmpty(Flux
.fromIterable(urlsHandlers)
.doOnSubscribe(s -> logger.debug("Downloading file \"{}\" content", url))
.map(urlsHandler -> urlsHandler
.requestContent(url)
.flatMapSequential(dataBlock -> Flux
@ -66,7 +77,8 @@ public class FileSponge implements URLsHandler {
)
)
.collectList()
.flatMapMany(Flux::firstWithValue)
.flatMapMany(monos -> FileSpongeUtils.firstWithValueFlux(monos))
.doOnComplete(() -> logger.debug("Downloaded file \"{}\" content", url))
)
.distinct(DataBlock::getId);
}
@ -77,9 +89,15 @@ public class FileSponge implements URLsHandler {
.fromIterable(cacheAccess)
.map(urlsHandler -> urlsHandler.requestMetadata(url))
.collectList()
.flatMap(Mono::firstWithValue)
.flatMap(monos -> FileSpongeUtils.firstWithValueMono(monos))
.doOnSuccess(metadata -> {
if (metadata != null) {
logger.debug("File \"{}\" metadata has been found in the cache", url);
}
})
.switchIfEmpty(Flux
.fromIterable(urlsHandlers)
.doOnSubscribe(s -> logger.debug("Downloading file \"{}\" metadata", url))
.map(urlsHandler -> urlsHandler
.requestMetadata(url)
.flatMap(dataBlock -> Flux
@ -89,7 +107,14 @@ public class FileSponge implements URLsHandler {
)
)
.collectList()
.flatMap(Mono::firstWithValue)
.flatMap(monos -> FileSpongeUtils.firstWithValueMono(monos))
.doOnSuccess(s -> {
if (s != null) {
logger.debug("Downloaded file \"{}\" metadata", url);
} else {
logger.debug("File \"{}\" metadata has not been found anywhere", url);
}
})
);
}
}

75
src/main/lombok/org/warp/filesponge/FileSpongeUtils.java Normal file
View File

@ -0,0 +1,75 @@
/*
* FileSponge
* Copyright (C) 2021 Andrea Cavalli
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package org.warp.filesponge;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.time.Duration;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.concurrent.TimeUnit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import reactor.core.Exceptions;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.core.scheduler.Schedulers;
public class FileSpongeUtils {
private static final Logger logger = LoggerFactory.getLogger(FileSponge.class);
public static <T> Mono<T> firstWithValueMono(List<Mono<T>> monos) {
return Mono.firstWithValue(monos).onErrorResume(FileSpongeUtils::ignoreFakeErrors);
}
public static <T> Flux<T> firstWithValueFlux(List<Flux<T>> monos) {
return Flux.firstWithValue(monos).onErrorResume(FileSpongeUtils::ignoreFakeErrors);
}
private static <T> Mono<T> ignoreFakeErrors(Throwable ex) {
return Mono.defer(() -> {
if (ex instanceof NoSuchElementException) {
var multiple = Exceptions.unwrapMultiple(ex.getCause());
for (Throwable throwable : multiple) {
if (!(throwable instanceof NoSuchElementException)) {
return Mono.error(ex);
}
}
return Mono.empty();
} else {
return Mono.error(ex);
}
});
}
public static Mono<Path> deleteFileAfter(Path path, Duration delay) {
return Mono.fromCallable(() -> {
Schedulers.boundedElastic().schedule(() -> {
try {
Files.deleteIfExists(path);
} catch (IOException e) {
logger.warn("Failed to delete file \"{}\"", path, e);
}
}, delay.toMillis(), TimeUnit.MILLISECONDS);
return path;
}).subscribeOn(Schedulers.boundedElastic());
}
}