我一直在使用 Node.js 的 HFC SDK，它曾经可以工作，但从昨晚开始我遇到了一些问题。

当运行 hello Blockchain.is 时，只有几次有效，大多数时候，当它尝试注册新用户时，我会收到此错误：

E0113 11:56:05.983919636    5288 handshake.c:128]            Security handshake failed: {"created":"@1484304965.983872199","description":"Handshake read failed","file":"../src/core/lib/security/transport/handshake.c","file_line":237,"referenced_errors":[{"created":"@1484304965.983866102","description":"FD shutdown","file":"../src/core/lib/iomgr/ev_epoll_linux.c","file_line":948}]}

Error:  Failed to register and enroll JohnDoe: Error

其他时候，注册有效，但部署链码时出现失败：

Enrolled and registered JohnDoe successfully

Deploying chaincode ...
E0113 12:14:27.341527043    5455 handshake.c:128]            Security handshake failed: {"created":"@1484306067.341430168","description":"Handshake read failed","file":"../src/core/lib/security/transport/handshake.c","file_line":237,"referenced_errors":[{"created":"@1484306067.341421859","description":"FD shutdown","file":"../src/core/lib/iomgr/ev_epoll_linux.c","file_line":948}]}

Failed to deploy chaincode: request={"fcn":"init","args":["a","100","b","200"],"chaincodePath":"chaincode","certificatePath":"/certs/peer/cert.pem"}, error={"error":{"code":14,"metadata":{"_internal_repr":{}}},"msg":"Error"}

Or:

Enrolled and registered JohnDoe successfully

Deploying chaincode ...
E0113 12:15:27.448867739    5483 handshake.c:128]            Security handshake failed: {"created":"@1484306127.448692244","description":"Handshake read failed","file":"../src/core/lib/security/transport/handshake.c","file_line":237,"referenced_errors":[{"created":"@1484306127.448668047","description":"FD shutdown","file":"../src/core/lib/iomgr/ev_epoll_linux.c","file_line":948}]}
events.js:160
  throw er; // Unhandled 'error' event
  ^

Error
at ClientDuplexStream._emitStatusIfDone (/usr/lib/node_modules/hfc/node_modules/grpc/src/node/src/client.js:189:19)
at ClientDuplexStream._readsDone (/usr/lib/node_modules/hfc/node_modules/grpc/src/node/src/client.js:158:8)
at readCallback (/usr/lib/node_modules/hfc/node_modules/grpc/src/node/src/client.js:217:12)
E0113 12:15:27.563487641    5483 handshake.c:128]            Security handshake failed: {"created":"@1484306127.563437122","description":"Handshake read failed","file":"../src/core/lib/security/transport/handshake.c","file_line":237,"referenced_errors":[{"created":"@1484306127.563429661","description":"FD shutdown","file":"../src/core/lib/iomgr/ev_epoll_linux.c","file_line":948}]}

该代码昨天有效，所以我不知道会发生什么。

有人知道我该如何修复它吗？

谢谢， 哈维尔.

ibm-bluemix

区块链

这些类型的间歇性问题通常与 GRPC 有关。初步建议是确保您至少使用 GRPC 版本 1.0.0。

如果您使用的是 Mac，则应检查打开文件描述符的最大数量（使用ulimit -n）。有时，该值最初设置为较低值，例如 256，因此增加该值可能会有所帮助。

有几个 GRPC 问题具有类似的症状。

• https://github.com/grpc/grpc/issues/8732
• https://github.com/grpc/grpc/issues/8839
• https://github.com/grpc/grpc/issues/8382

有一个grpc.initial_reconnect_backoff_ms其中一些问题中提到的财产。将值增加到 1000 毫秒以上可能有助于降低问题发生的频率。以下是有关如何修改 helloblockchain.js 文件以将此属性设置为更高值的说明。

1. 打开Hyperledger Fabric Client示例中的helloblockchain.js文件，找到enrollAndRegisterUsers功能。

2. Add “grpc.initial_reconnect_backoff_ms": 5000 to the setMemberServicesUrl call.

   chain.setMemberServicesUrl(ca_url, {
           pem: cert, "grpc.initial_reconnect_backoff_ms": 5000
   });
   

3. Add “grpc.initial_reconnect_backoff_ms": 5000 to the addPeer call.

   chain.addPeer("grpcs://" + peers[i].discovery_host + ":" + peers[i].discovery_port, 
   {pem: cert, "grpc.initial_reconnect_backoff_ms": 5000
   });       
   

请注意，设置grpc.initial_reconnect_backoff_ms财产可能会减少问题发生的频率，但不一定能消除所有问题。

在 helloblockchain.js 文件中建立的与 eventhub 的连接也可能是一个因素。 Hyperledger Fabric Client 的早期版本不使用 eventhub。可以尝试使用这个早期版本来确定这是否会产生影响。运行后git clone https://github.com/IBM-Blockchain/SDK-Demo.git, run git checkout b7d5195使用此先前级别。跑步前node helloblockchain.js从 Node.js 命令窗口中，git status命令可用于检查正在使用的代码级别。