build: added loader and service into main lib

1 files changed, 113 insertions, 0 deletions

diff --git a/src/main/java/ftbsc/lll/loader/LilleroLoader.java b/src/main/java/ftbsc/lll/loader/LilleroLoader.java
new file mode 100644
index 0000000..d7b0453
--- /dev/null
+++ b/src/main/java/ftbsc/lll/loader/LilleroLoader.java
@@ -0,0 +1,113 @@
+package ftbsc.lll.loader;
+
+import cpw.mods.modlauncher.serviceapi.ILaunchPluginService;
+
+import ftbsc.lll.IInjector;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import org.objectweb.asm.Type;
+import org.objectweb.asm.tree.ClassNode;
+import org.objectweb.asm.tree.MethodNode;
+
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.EnumSet;
+import java.util.List;
+import java.util.Map;
+import java.util.ServiceLoader;
+import java.util.stream.Collectors;
+
+public class LilleroLoader implements ILaunchPluginService {
+	public static final Logger LOGGER = LogManager.getLogger("LilleroLoader");
+	public static final String NAME = "lillero-loader";
+
+	private List<IInjector> injectors = new ArrayList<>();
+
+	public LilleroLoader() {
+		LOGGER.info("Lillero Patch Loader initialized");
+	}
+
+	@Override
+	public String name() {
+		return NAME;
+	}
+
+
+	// Load mods requesting patches from resources
+
+	@Override
+	public void offerResource(Path resource, String name) {
+		LOGGER.warn(String.format("Resource offered to us: %s @ '%s'", name, resource.toString()));
+	}
+
+	@Override
+	public void addResources(List<Map.Entry<String, Path>> resources) {
+		LOGGER.info("Resources being added:");
+		for (Map.Entry<String, Path> row : resources) {
+			LOGGER.info(String.format("> %s @ '%s'", row.getKey(), row.getValue().toString()));
+			try {
+				URL jarUrl = new URL("file:" + row.getValue().toString());
+				URLClassLoader loader = new URLClassLoader(new URL[] { jarUrl });
+				for (IInjector inj : ServiceLoader.load(IInjector.class, loader)) {
+					LOGGER.info(String.format("Registering injector %s", inj.name()));
+					this.injectors.add(inj);
+				}
+			} catch (MalformedURLException e) {
+				LOGGER.error(String.format("Malformed URL for resource %s - 'file:%s'", row.getKey(), row.getValue().toString()));
+			}
+		}
+	}
+
+
+	// Filter only classes we need to patch
+
+	@Override
+	public EnumSet<Phase> handlesClass(Type classType, final boolean isEmpty) {
+		throw new IllegalStateException("Outdated ModLauncher"); //mixin does it
+	}
+
+	private static final EnumSet<Phase> YAY = EnumSet.of(Phase.BEFORE);
+	private static final EnumSet<Phase> NAY = EnumSet.noneOf(Phase.class);
+
+	@Override
+	public EnumSet<Phase> handlesClass(Type classType, final boolean isEmpty, final String reason) {
+		if (isEmpty) return NAY;
+		// TODO can I make a set of target classes to make this faster
+		for (IInjector inj : this.injectors) {
+			if (inj.targetClass().equals(classType.getClassName()))
+				return YAY;
+		}
+		return NAY;
+	}
+
+
+	// Process classes and inject methods
+
+	@Override
+	public int processClassWithFlags(Phase phase, ClassNode classNode, Type classType, String reason) {
+		LOGGER.debug("Processing class {} in phase {} of {}", classType.getClassName(), phase.name(), reason);
+		List<IInjector> relevantInjectors = this.injectors.stream()
+			.filter(i -> i.targetClass().equals(classType.getClassName()))
+			.collect(Collectors.toList());
+		boolean modified = false;
+		for (MethodNode method : classNode.methods) {
+			for (IInjector inj : relevantInjectors) {
+				if (
+					inj.methodName().equals(method.name) &&
+					inj.methodDesc().equals(method.desc)
+				) {
+					LOGGER.info(String.format("Patching %s.%s with %s", classType.getClassName(), method.name, inj.name()));
+					inj.inject(classNode, method); // TODO catch patching exceptions
+					modified = true;
+				}
+			}
+		}
+
+		return modified ? ComputeFlags.COMPUTE_FRAMES : ComputeFlags.NO_REWRITE;
+	}
+}