R3944Realms/ModernFix
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Move hash computation into its own method

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embeddedt 2023-01-21 22:08:59 -05:00
parent bbe5709070
commit 2a29aee37b
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1 changed files with 72 additions and 65 deletions
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src/main/java/cpw/mods/modlauncher/ModernFixCachingClassTransformer.java
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@ -82,6 +82,44 @@ public class ModernFixCachingClassTransformer extends ClassTransformer {
}
}
private ArrayList<byte[]> computeHash(String className, boolean isEmpty, String reason) {
final String internalName = className.replace('.', '/');
final Type classDesc = Type.getObjectType(internalName);
ArrayList<ILaunchPluginService> pluginList = new ArrayList<>();
for(ILaunchPluginService plugin : plugins.values()) {
if(!plugin.handlesClass(classDesc, isEmpty, reason).isEmpty()) {
pluginList.add(plugin);
}
}
final boolean needsTransforming = transformStore.needsTransforming(internalName);
if (!needsTransforming && pluginList.isEmpty()) {
return null;
}
/* Now compute the hash list for the required transformers */
ArrayList<byte[]> hashList = new ArrayList<>();
pluginList.sort((service1, service2) -> Comparator.<String>naturalOrder().compare(service1.name(), service2.name()));
for(ILaunchPluginService service : pluginList) {
byte[] hash = obtainHash(service, className);
if(hash == null) {
return null;
}
hashList.add(hash);
}
if(needsTransforming) {
List<ITransformer<?>> transformers = this.transformersByClass.get(internalName);
if(transformers != null) {
for(ITransformer<?> transformer : transformers) {
byte[] hash = obtainHash(transformer, className);
if(hash == null) {
return null;
}
hashList.add(hash);
}
}
}
return hashList;
}
/**
* Check the hashed list of transformers and use a cached version of the class if possible. This code needs
* to be very fast as the entire point is to spend very little time doing transformation work that was done before.
@ -93,76 +131,45 @@ public class ModernFixCachingClassTransformer extends ClassTransformer {
@Override
public byte[] transform(byte[] inputClass, String className, String reason) {
/* We only want to cache actual transformations */
if(!ITransformerActivity.CLASSLOADING_REASON.equals(reason)) {
return super.transform(inputClass, className, reason);
}
final String internalName = className.replace('.', '/');
final Type classDesc = Type.getObjectType(internalName);
ArrayList<ILaunchPluginService> pluginList = new ArrayList<>();
for(ILaunchPluginService plugin : plugins.values()) {
if(!plugin.handlesClass(classDesc, inputClass.length == 0, reason).isEmpty()) {
pluginList.add(plugin);
}
}
final boolean needsTransforming = transformStore.needsTransforming(internalName);
if (!needsTransforming && pluginList.isEmpty()) {
return inputClass;
}
/* Now compute the hash list for the required transformers */
ArrayList<byte[]> hashList = new ArrayList<>();
pluginList.sort((service1, service2) -> Comparator.<String>naturalOrder().compare(service1.name(), service2.name()));
for(ILaunchPluginService service : pluginList) {
byte[] hash = obtainHash(service, className);
if(hash == null) {
return super.transform(inputClass, className, reason);
}
hashList.add(hash);
}
if(needsTransforming) {
List<ITransformer<?>> transformers = this.transformersByClass.get(internalName);
if(transformers != null) {
for(ITransformer<?> transformer : transformers) {
byte[] hash = obtainHash(transformer, className);
if(hash == null) {
return super.transform(inputClass, className, reason);
if(ITransformerActivity.CLASSLOADING_REASON.equals(reason)) {
ArrayList<byte[]> hashList = computeHash(className, inputClass.length == 0, reason);
if(hashList != null) {
/* Check if the cache contains a transformed class matching these hashes */
/* TODO maybe sanitize the class name? */
File cacheLocation = new File(CLASS_CACHE_FOLDER, className.replace('.', '/'));
boolean hashesMatch = true;
try(ObjectInputStream stream = new ObjectInputStream(new FileInputStream(cacheLocation))) {
ArrayList<byte[]> savedHash = (ArrayList<byte[]>)stream.readObject();
for(int i = 0; i < savedHash.size(); i++) {
if(!Arrays.equals(savedHash.get(i), hashList.get(i))) {
hashesMatch = false;
break;
}
}
hashList.add(hash);
}
}
}
/* Check if the cache contains a transformed class matching these hashes */
/* TODO maybe sanitize the class name? */
File cacheLocation = new File(CLASS_CACHE_FOLDER, className.replace('.', '/'));
boolean hashesMatch = true;
try(ObjectInputStream stream = new ObjectInputStream(new FileInputStream(cacheLocation))) {
ArrayList<byte[]> savedHash = (ArrayList<byte[]>)stream.readObject();
for(int i = 0; i < savedHash.size(); i++) {
if(!Arrays.equals(savedHash.get(i), hashList.get(i))) {
if(hashesMatch)
inputClass = (byte[])stream.readObject();
} catch(IOException | ClassNotFoundException | ClassCastException e) {
if(!(e instanceof FileNotFoundException))
e.printStackTrace();
hashesMatch = false;
break;
}
if(!hashesMatch) {
inputClass = super.transform(inputClass, className, reason);
final byte[] classToSave = inputClass;
classSaverPool.submit(() -> {
cacheLocation.getParentFile().mkdirs();
try(ObjectOutputStream stream = new ObjectOutputStream(new FileOutputStream(cacheLocation))) {
stream.writeObject(hashList);
stream.writeObject(classToSave);
} catch(IOException e) {
e.printStackTrace();
}
});
}
return inputClass;
}
if(hashesMatch)
inputClass = (byte[])stream.readObject();
} catch(IOException | ClassNotFoundException | ClassCastException e) {
if(!(e instanceof FileNotFoundException))
e.printStackTrace();
hashesMatch = false;
}
if(!hashesMatch) {
inputClass = super.transform(inputClass, className, reason);
final byte[] classToSave = inputClass;
classSaverPool.submit(() -> {
cacheLocation.getParentFile().mkdirs();
try(ObjectOutputStream stream = new ObjectOutputStream(new FileOutputStream(cacheLocation))) {
stream.writeObject(hashList);
stream.writeObject(classToSave);
} catch(IOException e) {
e.printStackTrace();
}
});
}
return inputClass;
return super.transform(inputClass, className, reason);
}
private final byte[] FORGE_HASH = LoadingModList.get().getModFileById("forge").getMods().get(0).getVersion().toString().getBytes(StandardCharsets.UTF_8);