nng | nanomsg-next-generation -- light-weight brokerless messaging | Build Tool library

I'm using NNG as my inter-server msg-queue.

Background:

1. I'm implementing a pair of long time background services, those are communicating with NNG;
2. Protocol: pair0 @ tcp;
3. The payload message occurs maybe a second, or maybe a day;

My question: Does NNG automatically transmit a "Heartbeat" msg peroidically to each peer to keep the TCP connection alive, if there is no producing msg for a specific time duration?

If NOT, should I do "HeartBeat" by myself?

BTW, this is the first time I use NNG. I don't know whether there is a official/populated support forum of it, so I ask my question here. If such a forum exists, pls. tell me. Thanks!

I'd like to use nanomsg/nng as the communication basis of a fully distributed peer-to-peer multi-node network, to help construct the dynamic ability of topological discovery and maintenance. Now I get stuck in its Golang package mangos.

The same work has been done in Python and pynng (which is a python binding for nanomsg), but when I use Go and invoke the corresponding methods by mangos instead, their behaviors are totally different. The puzzle is mainly threefold:

1. The bus-type-Socket's Recv() acts in a blocking mode by default and seems not to be configurable to the non-blocking mode. Documents says:

OptionRecvDeadline is the time until the next Recv times out. The value is a time.Duration. Zero value may be passed to indicate that no timeout should be applied. A negative value indicates a non-blocking operation. By default there is no timeout.

I tried a negative value accordingly, but Recv() was still blocking. What else should I do? and how to understand the difference between "Zero-timeout" and "non-blocking"?

1. The dialer returned by (s *socket) NewDialer(...) seems to linger on after calling dialer.Close(), since an error will occur when calling a next dialer.Dial() reporting it's still "address in use". But when I tried to Close() the dialer again, error occurs as well reporting it's already closed. I also tried different combinations of the following options, but all the attempts failed

I am trying to make a c-program server that publishes images via nng, and a python client via pynng that subscribes to the images.

For some reason i cannot connect these 2 parts and I dont know why. C/C++-program compiles and runs fine and so does python program, but something is published on the C/C++-program, nothing is recieved on the python client. Client and server runs on the same machine. Here is my C/C++-code for the server:

I'm working on a "server" thread, which takes care of some IO calls for a bunch of "clients".

The communication is done using pynng v0.5.0, the server has its own asyncio loop.

Each client "registers" by sending a first request, and then loops receiving the results and sending back READY messages.

On the server, the goal is to treat the first message of each client as a registration request, and to create a dedicated worker task which will loop doing IO stuff, sending the result and waiting for the READY message of that particular client.

To implement this, I'm trying to leverage the Context feature of REP0 sockets.

Side notes

• I would have liked to tag this question with nng and pynng, but I don't have enough reputation.

• Although I'm an avid consumer of this site, it's my first question :)

• I do know about the PUB/SUB pattern, let's just say that for self-instructional purposes, I chose not to use it for this service.

Problem:

After a few iterations, some READY messages are intercepted by the registration coroutine of the server, instead of being routed to the proper worker task.

Since I can't share the code, I wrote a reproducer for my issue and included it below.

Worse, as you can see in the output, some result messages are sent to the wrong client (ERROR:root:: worker/client mismatch, exiting.).

It looks like a bug, but I'm not entirely sure I understand how to use the contexts correctly, so any help would be appreciated.

Environment:

• winpython-3.8.2
• pynng v0.5.0+dev (46fbbcb2), with nng v1.3.0 (ff99ee51)

Code:

This is a Sinhalese Transliteration Convertor. It returns wrong output. Eg: If I enter m, it must return ම්, but it reruns ම්. I don't know why it gives additional ් The same code is working well in codepen, but not in Blogspot.

The JS is

vowelsUni[0]='ඌ'; vowels[0]='oo'; vowelModifiersUni[0]='ූ'; vowelsUni[1]='ඕ'; vowels[1]='o\\)'; vowelModifiersUni[1]='ෝ'; vowelsUni[2]='ඕ'; vowels[2]='oe'; vowelModifiersUni[2]='ෝ'; vowelsUni[3]='ආ'; vowels[3]='aa'; vowelModifiersUni[3]='ා'; vowelsUni[4]='ආ'; vowels[4]='a\\)'; vowelModifiersUni[4]='ා'; vowelsUni[5]='ඈ'; vowels[5]='Aa'; vowelModifiersUni[5]='ෑ'; vowelsUni[6]='ඈ'; vowels[6]='A\\)'; vowelModifiersUni[6]='ෑ'; vowelsUni[7]='ඈ'; vowels[7]='ae'; vowelModifiersUni[7]='ෑ'; vowelsUni[8]='ඊ'; vowels[8]='ii'; vowelModifiersUni[8]='ී'; vowelsUni[9]='ඊ'; vowels[9]='i\\)'; vowelModifiersUni[9]='ී'; vowelsUni[10]='ඊ'; vowels[10]='ie'; vowelModifiersUni[10]='ී'; vowelsUni[11]='ඊ'; vowels[11]='ee'; vowelModifiersUni[11]='ී'; vowelsUni[12]='ඒ'; vowels[12]='ea'; vowelModifiersUni[12]='ේ'; vowelsUni[13]='ඒ'; vowels[13]='e\\)'; vowelModifiersUni[13]='ේ'; vowelsUni[14]='ඒ'; vowels[14]='ei'; vowelModifiersUni[14]='ේ'; vowelsUni[15]='ඌ'; vowels[15]='uu'; vowelModifiersUni[15]='ූ'; vowelsUni[16]='ඌ'; vowels[16]='u\\)'; vowelModifiersUni[16]='ූ'; vowelsUni[17]='ඖ'; vowels[17]='au'; vowelModifiersUni[17]='ෞ'; vowelsUni[18]='ඇ'; vowels[18]='/\a'; vowelModifiersUni[18]='ැ'; vowelsUni[19]='අ'; vowels[19]='a'; vowelModifiersUni[19]=''; vowelsUni[20]='ඇ'; vowels[20]='A'; vowelModifiersUni[20]='ැ'; vowelsUni[21]='ඉ'; vowels[21]='i'; vowelModifiersUni[21]='ි'; vowelsUni[22]='එ'; vowels[22]='e'; vowelModifiersUni[22]='ෙ'; vowelsUni[23]='උ'; vowels[23]='u'; vowelModifiersUni[23]='ු'; vowelsUni[24]='ඔ'; vowels[24]='o'; vowelModifiersUni[24]='ො'; vowelsUni[25]='ඓ'; vowels[25]='I'; vowelModifiersUni[25]='ෛ'; nVowels=26; specialConsonantsUni[0]='ං'; specialConsonants[0]=/\\n/g; specialConsonantsUni[1]='ඃ'; specialConsonants[1]=/\\h/g; specialConsonantsUni[2]='ඞ'; specialConsonants[2]=/\\N/g; specialConsonantsUni[3]='ඍ'; specialConsonants[3]=/\\R/g; //special characher Repaya specialConsonantsUni[4]='ර්'+'\u200D'; specialConsonants[4]=/R/g; specialConsonantsUni[5]='ර්'+'\u200D'; specialConsonants[5]=/\\r/g; consonantsUni[0]='ඬ'; consonants[0]='nnd'; consonantsUni[1]='ඳ'; consonants[1]='nndh'; consonantsUni[2]='ඟ'; consonants[2]='nng'; consonantsUni[3]='ථ'; consonants[3]='Th'; consonantsUni[4]='ධ'; consonants[4]='Dh'; consonantsUni[5]='ඝ'; consonants[5]='gh'; consonantsUni[6]='ඡ'; consonants[6]='Ch'; consonantsUni[7]='ඵ'; consonants[7]='ph'; consonantsUni[8]='භ'; consonants[8]='bh'; consonantsUni[9]='ශ'; consonants[9]='sh'; consonantsUni[10]='ෂ'; consonants[10]='Sh'; consonantsUni[11]='ඥ'; consonants[11]='GN'; consonantsUni[12]='ඤ'; consonants[12]='KN'; consonantsUni[13]='ළු'; consonants[13]='Lu'; consonantsUni[14]='ද'; consonants[14]='dh'; consonantsUni[15]='ච'; consonants[15]='ch'; consonantsUni[16]='ඛ'; consonants[16]='kh'; consonantsUni[17]='ත'; consonants[17]='th'; consonantsUni[18]='ට'; consonants[18]='t'; consonantsUni[19]='ක'; consonants[19]='k'; consonantsUni[20]='ඩ'; consonants[20]='d'; consonantsUni[21]='න'; consonants[21]='n'; consonantsUni[22]='ප'; consonants[22]='p'; consonantsUni[23]='බ'; consonants[23]='b'; consonantsUni[24]='ම'; consonants[24]='m'; consonantsUni[25]='‍ය'; consonants[25]='\\u005C' + 'y'; consonantsUni[26]='‍ය'; consonants[26]='Y'; consonantsUni[27]='ය'; consonants[27]='y'; consonantsUni[28]='ජ'; consonants[28]='j'; consonantsUni[29]='ල'; consonants[29]='l'; consonantsUni[30]='ව'; consonants[30]='v'; consonantsUni[31]='ව'; consonants[31]='w'; consonantsUni[32]='ස'; consonants[32]='s'; consonantsUni[33]='හ'; consonants[33]='h'; consonantsUni[34]='ණ'; consonants[34]='N'; consonantsUni[35]='ළ'; consonants[35]='L'; consonantsUni[36]='ඛ'; consonants[36]='K'; consonantsUni[37]='ඝ'; consonants[37]='G'; consonantsUni[38]='ඨ'; consonants[38]='T'; consonantsUni[39]='ඪ'; consonants[39]='D'; consonantsUni[40]='ඵ'; consonants[40]='P'; consonantsUni[41]='ඹ'; consonants[41]='B'; consonantsUni[42]='ෆ'; consonants[42]='f'; consonantsUni[43]='ඣ'; consonants[43]='q'; consonantsUni[44]='ග'; consonants[44]='g'; //last because we need to ommit this in dealing with Rakaransha consonantsUni[45]='ර'; consonants[45]='r'; specialCharUni[0]='ෲ'; specialChar[0]='ruu'; specialCharUni[1]='ෘ'; specialChar[1]='ru'; //specialCharUni[2]='්‍ර'; specialChar[2]='ra'; function startText() { var s,r,v; text = document.txtBox.box1.value; //special consonents for (var i=0; i//consonents + HAL for (var i=0; i // End -->