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BundleDeltaClient.java
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BundleDeltaClient.java
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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
package com.facebook.react.devsupport;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.TreeMap;
import javax.annotation.Nullable;
import android.util.JsonReader;
import android.util.JsonToken;
import android.util.Pair;
import com.facebook.react.bridge.NativeDeltaClient;
import okhttp3.Headers;
import okio.Buffer;
import okio.BufferedSource;
public abstract class BundleDeltaClient {
private static final String METRO_DELTA_ID_HEADER = "X-Metro-Delta-ID";
@Nullable private String mRevisionId;
public enum ClientType {
NONE,
DEV_SUPPORT,
NATIVE
}
static boolean isDeltaUrl(String bundleUrl) {
return bundleUrl.indexOf(".delta?") != -1;
}
@Nullable
static BundleDeltaClient create(ClientType type) {
switch (type) {
case DEV_SUPPORT:
return new BundleDeltaJavaClient();
case NATIVE:
return new BundleDeltaNativeClient();
}
return null;
}
abstract public boolean canHandle(ClientType type);
abstract protected Pair<Boolean, NativeDeltaClient> processDelta(
BufferedSource body,
File outputFile) throws IOException;
final public synchronized String extendUrlForDelta(String bundleURL) {
return mRevisionId != null ? bundleURL + "&revisionId=" + mRevisionId : bundleURL;
}
public synchronized void reset() {
mRevisionId = null;
}
public synchronized Pair<Boolean, NativeDeltaClient> processDelta(
Headers headers,
BufferedSource body,
File outputFile) throws IOException {
mRevisionId = headers.get(METRO_DELTA_ID_HEADER);
return processDelta(body, outputFile);
}
private static class BundleDeltaJavaClient extends BundleDeltaClient {
byte[] mPreCode;
byte[] mPostCode;
final TreeMap<Number, byte[]> mModules = new TreeMap<Number, byte[]>();
@Override
public boolean canHandle(ClientType type) {
return type == ClientType.DEV_SUPPORT;
}
public synchronized void reset() {
super.reset();
mPreCode = null;
mPostCode = null;
mModules.clear();
}
@Override
public synchronized Pair<Boolean, NativeDeltaClient> processDelta(
BufferedSource body,
File outputFile) throws IOException {
JsonReader jsonReader = new JsonReader(new InputStreamReader(body.inputStream()));
jsonReader.beginObject();
int numChangedModules = 0;
while (jsonReader.hasNext()) {
String name = jsonReader.nextName();
if (name.equals("pre")) {
mPreCode = jsonReader.nextString().getBytes();
} else if (name.equals("post")) {
mPostCode = jsonReader.nextString().getBytes();
} else if (name.equals("modules")) {
numChangedModules += setModules(jsonReader, mModules);
} else if (name.equals("added")) {
numChangedModules += setModules(jsonReader, mModules);
} else if (name.equals("modified")) {
numChangedModules += setModules(jsonReader, mModules);
} else if (name.equals("deleted")) {
numChangedModules += removeModules(jsonReader, mModules);
} else {
jsonReader.skipValue();
}
}
jsonReader.endObject();
jsonReader.close();
if (numChangedModules == 0) {
// If we receive an empty delta, we don't need to save the file again (it'll have the
// same content).
return Pair.create(Boolean.FALSE, null);
}
FileOutputStream fileOutputStream = new FileOutputStream(outputFile);
try {
fileOutputStream.write(mPreCode);
fileOutputStream.write('\n');
for (byte[] code : mModules.values()) {
fileOutputStream.write(code);
fileOutputStream.write('\n');
}
fileOutputStream.write(mPostCode);
fileOutputStream.write('\n');
} finally {
fileOutputStream.flush();
fileOutputStream.close();
}
return Pair.create(Boolean.TRUE, null);
}
private static int setModules(JsonReader jsonReader, TreeMap<Number, byte[]> map)
throws IOException {
jsonReader.beginArray();
int numModules = 0;
while (jsonReader.hasNext()) {
jsonReader.beginArray();
int moduleId = jsonReader.nextInt();
map.put(moduleId, jsonReader.nextString().getBytes());
jsonReader.endArray();
numModules++;
}
jsonReader.endArray();
return numModules;
}
private static int removeModules(JsonReader jsonReader, TreeMap<Number, byte[]> map)
throws IOException {
jsonReader.beginArray();
int numModules = 0;
while (jsonReader.hasNext()) {
int moduleId = jsonReader.nextInt();
map.remove(moduleId);
numModules++;
}
jsonReader.endArray();
return numModules;
}
}
private static class BundleDeltaNativeClient extends BundleDeltaClient {
private final NativeDeltaClient nativeClient = new NativeDeltaClient();
@Override
public boolean canHandle(ClientType type) {
return type == ClientType.NATIVE;
}
@Override
protected Pair<Boolean, NativeDeltaClient> processDelta(
BufferedSource body,
File outputFile) throws IOException {
nativeClient.processDelta(body);
return Pair.create(Boolean.FALSE, nativeClient);
}
@Override
public void reset() {
super.reset();
nativeClient.reset();
}
}
}