javascript - 套接字 : Error: Lone surrogate U+D83D is not a scalar value

Question

最近，由于这个 socket.io 错误，我的 Node.js 服务器经常崩溃。我怀疑客户端正在发送无效的 utf 字符串，这将在 utf8.js 文件中引发错误。有没有办法避免服务器崩溃？这非常令人沮丧。如果需要的话，我会修补这个文件。

Error: Lone surrogate U+D83D is not a scalar value
at Error (native)
at checkScalarValue (/root/node_modules/socket.io/node_modules/engine.io/node_modules/engine.io-parser/node_modules/utf8/utf8.js:69:10)
at encodeCodePoint (/root/node_modules/socket.io/node_modules/engine.io/node_modules/engine.io-parser/node_modules/utf8/utf8.js:90:4)
at Object.utf8encode [as encode] (/root/node_modules/socket.io/node_modules/engine.io/node_modules/engine.io-parser/node_modules/utf8/utf8.js:111:18)
at Object.exports.encodePacket (/root/node_modules/socket.io/node_modules/engine.io/node_modules/engine.io-parser/lib/index.js:74:34)
at encodeOne (/root/node_modules/socket.io/node_modules/engine.io/node_modules/engine.io-parser/lib/index.js:387:13)
at eachWithIndex (/root/node_modules/socket.io/node_modules/engine.io/node_modules/engine.io-parser/lib/index.js:256:5)
at map (/root/node_modules/socket.io/node_modules/engine.io/node_modules/engine.io-parser/lib/index.js:263:5)
at Object.exports.encodePayloadAsBinary (/root/node_modules/socket.io/node_modules/engine.io/node_modules/engine.io-parser/lib/index.js:411:3)
at Object.exports.encodePayload (/root/node_modules/socket.io/node_modules/engine.io/node_modules/engine.io-parser/lib/index.js:225:20)
at XHR.Polling.send (/root/node_modules/socket.io/node_modules/engine.io/lib/transports/polling.js:238:10)
at Socket.flush (/root/node_modules/socket.io/node_modules/engine.io/lib/socket.js:341:20)
at Socket.sendPacket (/root/node_modules/socket.io/node_modules/engine.io/lib/socket.js:317:10)
at Socket.send.Socket.write (/root/node_modules/socket.io/node_modules/engine.io/lib/socket.js:290:8)
at writeToEngine (/root/node_modules/socket.io/lib/client.js:148:17)
at Client.packet (/root/node_modules/socket.io/lib/client.js:159:7)

Answer 1

可能您正在尝试以错误的方式发送数据。

您可以尝试在 Client/socket.packet 周围进行try {} catch (e) {}，或者执行如下操作:

process.on('uncaughtException', (err) => {
  console.log(`Caught exception: ${err}`);
});

防止服务器死机。