GroupChannelOptionForLinux初始化时EventLoopGroup需增加动态判断

[sakimonk]

你的问题 | 使用场景

在安卓手机中运行 ioGame 报错" no netty_transport_native_epoll in java.library.path", 研究后发现轻量级或嵌入式 Linux 发行版可能没有完整的 I/O 多路复用支持，如 epoll，同时代码写死EpollEventLoopGroup判断导致报错。
修复建议：
修改GroupChannelOptionForLinux类增加动态判断，系统不支持epoll时切换成nio，可以参考com.alipay.remoting.util.NettyEventLoopUtil代码实现

预期值

安卓手机中运行没有报错

实际值

在安卓手机中运行iogame报错" no netty_transport_native_epoll in java.library.path"

复现步骤

安卓手机中运行 ioGame 报如下错误

Exception in thread "InternalRunOne2" java.lang.UnsatisfiedLinkError: failed to load the required native library
        at io.netty.channel.epoll.Epoll.ensureAvailability(Epoll.java:81)
        at io.netty.channel.epoll.EpollEventLoop.<clinit>(EpollEventLoop.java:57)
        at io.netty.channel.epoll.EpollEventLoopGroup.newChild(EpollEventLoopGroup.java:189)
        at io.netty.channel.epoll.EpollEventLoopGroup.newChild(EpollEventLoopGroup.java:37)
        at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:84)
        at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:60)
        at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:49)
        at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:59)
        at io.netty.channel.epoll.EpollEventLoopGroup.<init>(EpollEventLoopGroup.java:117)
        at io.netty.channel.epoll.EpollEventLoopGroup.<init>(EpollEventLoopGroup.java:104)
        at io.netty.channel.epoll.EpollEventLoopGroup.<init>(EpollEventLoopGroup.java:81)
        at com.iohao.game.external.core.netty.micro.auto.GroupChannelOptionForLinux.bossGroup(GroupChannelOptionForLinux.java:39)
        at com.iohao.game.external.core.netty.micro.SocketMicroBootstrap.startup(SocketMicroBootstrap.java:52)
        at com.iohao.game.external.core.netty.DefaultExternalServer.startup(DefaultExternalServer.java:86)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
        at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.lang.UnsatisfiedLinkError: /data/data/com.termux/files/usr/tmp/libnetty_transport_native_epoll_aarch_643820611535310915400.so: dlopen failed: library "libdl.so.2" not found: needed by /data/data/com.termux/files/usr/tmp/libnetty_transport_native_epoll_aarch_643820611535310915400.so in namespace (default)
        at java.base/jdk.internal.loader.NativeLibraries.load(Native Method)
        at java.base/jdk.internal.loader.NativeLibraries$NativeLibraryImpl.open(NativeLibraries.java:384)
        at java.base/jdk.internal.loader.NativeLibraries.loadLibrary(NativeLibraries.java:228)
        at java.base/jdk.internal.loader.NativeLibraries.loadLibrary(NativeLibraries.java:170)
        at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2389)
        at java.base/java.lang.Runtime.load0(Runtime.java:751)
        at java.base/java.lang.System.load(System.java:1912)
        at io.netty.util.internal.NativeLibraryUtil.loadLibrary(NativeLibraryUtil.java:36)
        at io.netty.util.internal.NativeLibraryLoader.loadLibrary(NativeLibraryLoader.java:396)
        at io.netty.util.internal.NativeLibraryLoader.load(NativeLibraryLoader.java:218)
        at io.netty.channel.epoll.Native.loadNativeLibrary(Native.java:334)
        at io.netty.channel.epoll.Native.<clinit>(Native.java:96)
        at io.netty.channel.epoll.Epoll.<clinit>(Epoll.java:40)
        ... 16 more
        Suppressed: java.lang.UnsatisfiedLinkError: /data/data/com.termux/files/usr/tmp/libnetty_transport_native_epoll_aarch_643820611535310915400.so: dlopen failed: library "libdl.so.2" not found: needed by /data/data/com.termux/files/usr/tmp/libnetty_transport_native_epoll_aarch_643820611535310915400.so in namespace (default)
                at java.base/jdk.internal.loader.NativeLibraries.load(Native Method)
                at java.base/jdk.internal.loader.NativeLibraries$NativeLibraryImpl.open(NativeLibraries.java:384)
                at java.base/jdk.internal.loader.NativeLibraries.loadLibrary(NativeLibraries.java:228)
                at java.base/jdk.internal.loader.NativeLibraries.loadLibrary(NativeLibraries.java:170)
                at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2389)
                at java.base/java.lang.Runtime.load0(Runtime.java:751)
                at java.base/java.lang.System.load(System.java:1912)
                at io.netty.util.internal.NativeLibraryUtil.loadLibrary(NativeLibraryUtil.java:36)
                at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
                at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
                at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
                at java.base/java.lang.reflect.Method.invoke(Method.java:568)
                at io.netty.util.internal.NativeLibraryLoader$1.run(NativeLibraryLoader.java:430)
                at java.base/java.security.AccessController.doPrivileged(AccessController.java:318)
                at io.netty.util.internal.NativeLibraryLoader.loadLibraryByHelper(NativeLibraryLoader.java:422)
                at io.netty.util.internal.NativeLibraryLoader.loadLibrary(NativeLibraryLoader.java:388)
                ... 20 more
        Suppressed: java.lang.UnsatisfiedLinkError: no netty_transport_native_epoll_aarch_64 in java.library.path: /usr/java/packages/lib:/lib:/usr/lib
                at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2429)
                at java.base/java.lang.Runtime.loadLibrary0(Runtime.java:814)
                at java.base/java.lang.System.loadLibrary(System.java:1948)
                at io.netty.util.internal.NativeLibraryUtil.loadLibrary(NativeLibraryUtil.java:38)
                at io.netty.util.internal.NativeLibraryLoader.loadLibrary(NativeLibraryLoader.java:396)
                at io.netty.util.internal.NativeLibraryLoader.load(NativeLibraryLoader.java:161)
                ... 19 more
                Suppressed: java.lang.UnsatisfiedLinkError: no netty_transport_native_epoll_aarch_64 in java.library.path: /usr/java/packages/lib:/lib:/usr/lib
                        at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2429)
                        at java.base/java.lang.Runtime.loadLibrary0(Runtime.java:814)
                        at java.base/java.lang.System.loadLibrary(System.java:1948)
                        at io.netty.util.internal.NativeLibraryUtil.loadLibrary(NativeLibraryUtil.java:38)
                        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
                        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
                        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
                        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
                        at io.netty.util.internal.NativeLibraryLoader$1.run(NativeLibraryLoader.java:430)
                        at java.base/java.security.AccessController.doPrivileged(AccessController.java:318)
                        at io.netty.util.internal.NativeLibraryLoader.loadLibraryByHelper(NativeLibraryLoader.java:422)
                        at io.netty.util.internal.NativeLibraryLoader.loadLibrary(NativeLibraryLoader.java:388)
                        ... 20 more
        Suppressed: java.lang.UnsatisfiedLinkError: could not load a native library: netty_transport_native_epoll
                at io.netty.util.internal.NativeLibraryLoader.load(NativeLibraryLoader.java:239)
                at io.netty.channel.epoll.Native.loadNativeLibrary(Native.java:337)
                ... 18 more
        Caused by: java.io.FileNotFoundException: META-INF/native/libnetty_transport_native_epoll.so
                at io.netty.util.internal.NativeLibraryLoader.load(NativeLibraryLoader.java:186)
                ... 19 more
                Suppressed: java.lang.UnsatisfiedLinkError: no netty_transport_native_epoll in java.library.path: /usr/java/packages/lib:/lib:/usr/lib
                        at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2429)
                        at java.base/java.lang.Runtime.loadLibrary0(Runtime.java:814)
                        at java.base/java.lang.System.loadLibrary(System.java:1948)
                        at io.netty.util.internal.NativeLibraryUtil.loadLibrary(NativeLibraryUtil.java:38)
                        at io.netty.util.internal.NativeLibraryLoader.loadLibrary(NativeLibraryLoader.java:396)
                        at io.netty.util.internal.NativeLibraryLoader.load(NativeLibraryLoader.java:161)
                        ... 19 more
                        Suppressed: java.lang.UnsatisfiedLinkError: no netty_transport_native_epoll in java.library.path: /usr/java/packages/lib:/lib:/usr/lib
                                at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2429)
                                at java.base/java.lang.Runtime.loadLibrary0(Runtime.java:814)
                                at java.base/java.lang.System.loadLibrary(System.java:1948)
                                at io.netty.util.internal.NativeLibraryUtil.loadLibrary(NativeLibraryUtil.java:38)
                                at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
                                at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
                                at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
                                at java.base/java.lang.reflect.Method.invoke(Method.java:568)
                                at io.netty.util.internal.NativeLibraryLoader$1.run(NativeLibraryLoader.java:430)
                                at java.base/java.security.AccessController.doPrivileged(AccessController.java:318)
                                at io.netty.util.internal.NativeLibraryLoader.loadLibraryByHelper(NativeLibraryLoader.java:422)
                                at io.netty.util.internal.NativeLibraryLoader.loadLibrary(NativeLibraryLoader.java:388)
                                ... 20 more

版本

• ioGame version:
  ioGame17分支代码

[iohao]

好的。

[iohao]

default value

ioGame/external/external-netty/src/main/java/com/iohao/game/external/core/netty/DefaultExternalCoreSetting.java

Lines 146 to 166 in 7b970dc

	public GroupChannelOption getGroupChannelOption() {
	if (Objects.isNull(this.groupChannelOption)) {
	this.groupChannelOption = createGroupChannelOption();
	}
	return this.groupChannelOption;
	}
	private GroupChannelOption createGroupChannelOption() {
	if (OsInfo.isMac()) {
	return new GroupChannelOptionForMac();
	}
	// #375，Lightweight or embedded Linux distributions may not have fulled I/O multiplexing support
	if (OsInfo.isLinux() && Epoll.isAvailable()) {
	return new GroupChannelOptionForLinux();
	}
	// other system nio
	return new GroupChannelOptionForOther();
	}

set GroupChannelOption

private ExternalServer createExternalServer(int port) {    
    var builder = DefaultExternalServer.newBuilder(port);
    // ExternalCore setting
    var setting = builder.setting();
    // set GroupChannelOption
    setting.setGroupChannelOption(new GroupChannelOptionForOther());
}