[Ndn-lib] ndn-js proxy crash FYI

Alexander Horn alexnano at ucla.edu
Sat Mar 16 14:38:09 PDT 2013

great !

i've updated it, and I have proxy at ndnucla-staging hub on an auto-recover
loop that stores crash logs.

let's see how it behaves today; i'll push both to all appboxes tomorrow.

at some point it would be wise to make your web page round-robin w/ the
hubs... though not sure if Jeff wants to do that before monday's demo?
depends how confident we are in testbed connectivity :)

A.ws.ndn.ucla.edu <http://a.ws.ndn.ucla.edu/> [PARC]
B.ws.ndn.ucla.edu <http://b.ws.ndn.ucla.edu/> [UCLA-APPS-STAGING]
C.ws.ndn.ucla.edu <http://c.ws.ndn.ucla.edu/> [ARIZONA]
D.ws.ndn.ucla.edu <http://d.ws.ndn.ucla.edu/> [CAIDA]
E.ws.ndn.ucla.edu <http://e.ws.ndn.ucla.edu/> [ILLINOIS]

On Fri, Mar 15, 2013 at 5:53 PM, Wentao Shang <wentaoshang at gmail.com> wrote:

> Hi Alex,
> Thanks for discovering this bug. After some analysis I believe the crash
> is caused by the situation when the client first asks for a data and then
> closes websocket connection before the server returns the answer. The proxy
> would then write to a broken tcp connection and throw an exception. I
> pushed a new version of wsproxy-tcp.js to the github, which should solve
> this issue. Can you help test the new code on our app box?
> Best,
> Wentao
> On Fri, Mar 15, 2013 at 1:18 PM, Alexander Horn <alexnano at ucla.edu> wrote:
>> Team,
>> it's great to see ndn-js getting used in multiple projects.
>> ws-proxy is pretty stable on the app boxes... yet last night, after a few
>> weeks of uptime the ws-proxy on UCLA app box crashed.
>> ccndstatus indicates route to hub was still up; box appeared normal -
>> ccnd & route up, online... just no ws-proxy.
>> The only thing different about this app box, is it's
>> directly communicating w/ Wentao's latest ndn-js client for BMS/repo data.
>> http://borges.metwi.ucla.edu/ndn-sensor/status.html
>> I have full packet capture via ws-proxy logging (15MB) if wanted;
>> meanwhile here's stderr:
>> /home/localadmin/NDNAppBox/installer/ndn-js/wsproxy/node_modules/ws/lib/WebSocket.js:175
>>     else throw new Error('not opened');
>>          ^
>> Error: not opened
>>     at WebSocket.send
>> (/home/localadmin/NDNAppBox/installer/ndn-js/wsproxy/node_modules/ws/lib/WebSocket.js:175:16)
>>     at Socket.<anonymous>
>> (/home/localadmin/NDNAppBox/installer/ndn-js/wsproxy/wsproxy-tcp.js:101:7)
>>     at Socket.EventEmitter.emit (events.js:96:17)
>> _______________________________________________
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>> Ndn-lib at lists.cs.ucla.edu
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> --
> PhD student @ Internet Research Lab, Computer Science Department,
> University of California, Los Angeles
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