我有这个示例Node.js脚本:
var mdns = require('mdns');
var browser = mdns.createBrowser(mdns.tcp('http'));
browser.on('error', function (error) {
console.log("error");
console.log(error);
});
browser.on('serviceUp', function (service) {
console.log("serviceUp");
console.log(service);
});
browser.start();
在我的Mac上,它工作正常,找到了两项服务。如果我在运行 Raspbean (连接到同一网络)的 Raspberry PI 2 上运行完全相同的脚本,我会收到此输出:
pi@raspberrypi ~ $ node mdns.js
*** WARNING *** The program 'node' uses the Apple Bonjour compatibility layer of Avahi.
*** WARNING *** Please fix your application to use the native API of Avahi!
*** WARNING *** For more information see <http://0pointer.de/avahi-compat?s=libdns_sd&e=node>
*** WARNING *** The program 'node' called 'DNSServiceRegister()' which is not supported (or only supported partially) in the Apple Bonjour compatibility layer of Avahi.
*** WARNING *** Please fix your application to use the native API of Avahi!
*** WARNING *** For more information see <http://0pointer.de/avahi-compat?s=libdns_sd&e=node&f=DNSServiceRegister>
error
{ [Error: getaddrinfo -3008] code: -3008, errno: -3008, syscall: 'getaddrinfo' }
error
{ [Error: getaddrinfo -3008] code: -3008, errno: -3008, syscall: 'getaddrinfo' }
A issue on the mdns GitHub,声明忽略警告是公平的。
但是这两个错误呢?这是我的 Raspberry PI 上的某种配置问题吗?
答案 0 :(得分:5)
在本地修改节点模块代码是一种不好的做法。
创建mdns浏览器时,最好执行以下操作:
var sequence = [
mdns.rst.DNSServiceResolve(),
'DNSServiceGetAddrInfo' in mdns.dns_sd ? mdns.rst.DNSServiceGetAddrInfo() : mdns.rst.getaddrinfo({families:[4]}),
mdns.rst.makeAddressesUnique()
];
var browser = mdns.createBrowser(mdns.tcp('http'), {resolverSequence: sequence});
像评论中所说:https://github.com/agnat/node_mdns/issues/130#issuecomment-120731155
因此,它将避免错误并允许每个在项目上工作的人获得相同的版本,并且不必修改本地的mdns代码。
答案 1 :(得分:2)
在此GitHub问题上找到了一个解决方案: https://github.com/agnat/node_mdns/issues/130
在mdns中修改 lib / browser.js 中的 Browser.defaultResolverSequence 。
Browser.defaultResolverSequence = [
rst.DNSServiceResolve(), 'DNSServiceGetAddrInfo' in dns_sd ? rst.DNSServiceGetAddrInfo() : rst.getaddrinfo({families:[4]})
, rst.makeAddressesUnique()
];