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159 lines (142 loc) · 5.13 KB
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/*
* Copyright 2011-2012 Paddy Byers
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.meshpoint.anode;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import android.content.Context;
import android.util.Log;
/**
* Wraps the native jni node.js library
* This is a static class only
* @author paddy
*/
final class RuntimeNative {
private static String TAG = "anode::RuntimeNative";
private static String RUNTIME_LIBRARY = "libjninode.so";
private static String BRIDGE_LIBRARY = "bridge.node";
static final int SIGINT = 2;
static final int SIGABRT = 6;
static final int SIGKILL = 9;
static final int SIGTERM = 15;
/**
* Initialise the native interface
* @param ctx the Context associated with the invoking activity,
* used to locate the assets
* @throws IOException if there was a problem accessing the native library file
* @throws UnsatisifiedLinkError if there was a problem initialising the native library
*/
static void init(Context ctx, String[] argv) throws IOException {
char sep = File.separatorChar;
String packageName = ctx.getPackageName();
// Example: `/data/data/org.mypackage.android/node_modules`
// TODO: make the node dynamic library not depend on assumed /data/data filesystem structure
String modulePath = sep + "data" + sep + "data" + sep + packageName + sep + "node_modules";
String runtimePath = sep + "data" + sep + "data" + sep + packageName + sep + "app";
try {
extractLib(ctx, runtimePath, RUNTIME_LIBRARY);
System.load(runtimePath + '/' + RUNTIME_LIBRARY);
extractLib(ctx, modulePath, BRIDGE_LIBRARY);
System.load(modulePath + '/' + BRIDGE_LIBRARY);
Log.v(TAG, "init: loaded libraries: modulePath = " + modulePath);
nodeInit(argv, modulePath);
} catch(UnsatisfiedLinkError e) {
Log.v(TAG, "init: unable to load library: " + e);
throw e;
} catch (IOException e) {
Log.v(TAG, "init: unable to write library to file: " + e);
throw e;
}
}
/**
* Initialise the native node runtime
*/
static native void nodeInit(String[] argv, String modulePath);
/**
* Dispose the native node runtime
*/
static native void nodeDispose();
/**
* Create a node.js isolate
* @return isolate handle, or 0 if error
*/
static native long create();
/**
* Launch the node.js runtime. The thread that enters this method
* will block until the runtime exits.
* It is critical that a thread blocked in this method is not forcibly
* terminated by the calling application, except in the case that the
* entire application is about to exit, or native library resources
* may be leaked
* @param isolate the isolate handle
* @param argv the options and arguments to pass to the node.js invocation
* @return 0 if successful, else an error code
*/
static native int start(long isolate, String[] argv);
/**
* Stop a running runtime. An event will be delivered to the runtime that
* simulates the delivery of the specified signal.
* The supported events/signals are:
* SIGINT: interrupt a current blocked operation; may be caught by a handler
* in the runtime
* SIGTERM: request termination of the runtime; may be caught by a handler
* in the runtime
* SIGKILL: request termination of the runtime; may be caught by a handler
* in the runtime
* SIGABRT: forcibly terminate the runtime instance
* @param isolate the isolate handle
* @param signum the signal number
* @return 0 if successful, error code otherwise
*/
static native int stop(long isolate, int signum);
/**
* Dispose a native isolate instance
*/
static native void isolateDispose(long isolate);
/**
* Extract the library from assets to the default library location.
* @throws IOException
*/
private static void extractLib(Context ctx, String path, String name) throws IOException {
File dir, so, pkg;
if(!(dir = new File(path)).exists())
dir.mkdirs();
if((so = new File(dir, name)).exists()) {
/* check to see if this timestamp pre-dates
* the current package */
if((pkg = new File(ctx.getPackageResourcePath())).exists()) {
if(pkg.lastModified() < so.lastModified()) {
Log.v(TAG, "extractLib: library up to date");
return;
}
}
Log.v(TAG, "extractLib: library present but out of date");
so.delete();
}
Log.v(TAG, "extractLib: copying library");
InputStream in = ctx.getAssets().open(name);
FileOutputStream out = new FileOutputStream(so);
int read;
byte[] buf = new byte[8192];
while((read = in.read(buf)) != -1)
out.write(buf, 0, read);
in.close();
out.flush();
out.close();
so.setExecutable(true);
}
}