conch | micro library for async sequential batches | Reactive Programming library
kandi X-RAY | conch Summary
kandi X-RAY | conch Summary
micro library for batch running promises (Node/Browser/Deno). For low powered/memory systems and browsers it's sometimes impossible to run all the promises at once and it's easier to run it in batches one after the other, this helper basically does that. It chains the batches in a dependency chain and waits for the first batch to finish before executing the next.This can be controlled by the limit option, by providing the number of promises that a single batch will have.
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QUESTION
I have been trying to install python-binance for Python 3.9.1 through visual studio code.
When installing with pip install, I get errors in red font!
How could I solve this problem?
the appeared part of error messages :
...ANSWER
Answered 2021-Feb-08 at 16:26If you want to use Python 3.9, you can download Twisted from here and pip install it, then install python-binance
QUESTION
I'm also getting the same error while installing Twisted.
Here's version info:
- Django : 1.9
- Python : 3.5
- Trying to install latest version of
Django-channels - Command used :
pip install channels
The error :
running build_ext
building 'twisted.test.raiser' extension error: [WinError 2] The system cannot find the file specified
(Almost) full error message
...ANSWER
Answered 2017-Dec-22 at 14:39You need a working C compiler to install Twisted on platforms for which wheels are not provided. There is no Python 3.5 wheel on PyPI for Twisted (at this time). So you need a working C compiler.
Follow these instructions for installing VS2015 to get a working C compiler so Twisted can build the necessary extension modules and install successfully.
QUESTION
Does Apache Active MQ provide Server-To-Server-Connection as IBM Websphere MQ does?
Background:
We currently have Websphere MQ 7.0.1 (CUST) installed to communicate with another remote Websphere MQ Server (GOV), which is not under our control. The MQs hold a Server-To-Server-Connection via VPN-tunnel. We would like to replace our Websphere MQ with Apache ActiveMQ.
We have one QM-Manager with 4 queues and 3 channels.
Queues:
- OUT (type remote): for sending messages to GOV
- QOUT (local type transmission) that is used for OUT
- IMP (local): used for receiving from GOV
- DLQ: (local): dead letter queue
Channels:
- conch: server connection
- CUST_GOV: sender
- GOV_CUST: receiver
I read a lot about bridging ActiveMQ to Websphere MQ (Client API, Resource Adapter, OSGi) with Camel.
Looks pretty easy with a Camel route, but this is at least a Client-Server setup.
E. G. https://www.shaishavparekh.com/2016/01/wmq-to-amq-bridge/
I need something that hides away the IBM proprietary channel stuff.
Now I found this entry: https://serverfault.com/questions/366743/apache-activemq-server-to-server-connection
As this is from 2012 I would like to ask, if anyone successful switched from Websphere MQ to ActiveMQ resp. is it still true that I can only use Client-Server?
...ANSWER
Answered 2019-Apr-04 at 14:19ActiveMQ does not support a server-to-server connection to WebsphereMQ. As you mentioned, Camel would probably be the simplest way to get a connection between the two brokers.
To be clear, even if ActiveMQ did implement a bridge with WebsphereMQ it would almost certainly use the WebsphereMQ client so would fundamentally still be a client-server implementation. It's not really clear from your question why you want to avoid this.
QUESTION
I want to implement a Telnet Server using Twisted python. According to Twisted documentation, I wrote code below and it works correctly. but I have 2 problems with it.
First of all, I can not understand what lambda syntax exactly mean in this code and how those three classes are related to each other using lambda.
Second, I need to use self.transport.getPeer() to get client ip address. but there is nothing similar to transport attribute in HistoricRecvLine class. (self.transport is one of ServerProtocol attributes.)
I really need to use recvline in order to manage terminal, and also need to use transport attribute. But i don't know how to use both of them.
What do you recommend?
ANSWER
Answered 2019-Sep-02 at 08:44I can not understand what lambda syntax exactly mean in this code
It's defining a function with no name. It's as if you wrote
QUESTION
trying to run a pymodbus tcp server and im getting this stack trace... at a total loss here so any help is appreciated. Thanks!
...ANSWER
Answered 2017-Dec-04 at 21:24I was using pip 7 and got the same problem. Upgrading to pip 9 solved it. I'm not sure about the cause.
QUESTION
I've been trying to learn purrr, as I've been working with some deeply nested JSON data, but I keep getting errors that don't seem to be appearing elsewhere online. Below is my JSON data / code:
...ANSWER
Answered 2019-Jun-11 at 22:19If you want to return an element of a list if something else is true, why not just a simple ifelse?
QUESTION
I have a Solaris 10 system, with Python 2.6.4, and I have to retrieve the files via the SFTP protocol, from the server, which does not allow the SSH logging in, i.e. only SFTP with RSA key is allowed. Could anyone please tell me:
- is this possible at all?
- is this possible with the above version of Python, or I need to upgrade it to 2.7.* work with the latest version of Twisted?
I have found this treat with the relevant information: twisted conch filetransfer And this one: Python Twisted: twisted conch filetransfer verifyHostKey But it is said there that Twisted first creates the SSH channel, and then establishes SFTP on top of it (forgive me for my possible misunderstanding and/or illiteracy), from the Twisted documentation:
Conch also provides an endpoint that is initialized with an already established SSH connection. This endpoint just opens a new channel on the existing connection and launches a command in that.
Will the same approach work in case you can not logging in via SSH? I.e. might it be possible to create an SSH channel if terminal SSH logging in is forbidden?
Are there any other approaches except Paramico, any other libraries that can help me in case of "No" to the above questions?
...ANSWER
Answered 2019-Apr-02 at 18:38I know nothing about "Twisted". But I believe that you just have a terminology problem.
which does not allow the SSH logging in, i.e. only SFTP with RSA key is allowed
The above is nonsense. You cannot allow SFTP, but disallow SSH, because as you have already found in Twisted documentation, SFTP runs on top of SSH (this is true in general, that's nothing Twisted-specific).
What your server most probably really "does not allow" is "shell" access. That's not the same as as SSH. So the server allows SSH, allows SFTP, but does not allow shell.
QUESTION
I finally have scrapy installed but am unable to get it to run bench or shell. here is what is returned in console:
...ANSWER
Answered 2018-Feb-19 at 22:34In python 3.7, async and await are made keywords, making that syntax invalid.
This is mentioned in PEP 492, but I don't see any reference to it in the "What's New" docs for python 3.7
It would seem that twisted doesn't yet support python 3.7
QUESTION
I'm trying to make a simple Telnet server that logs the username/password pairs used by the bots out there that try to brute force weak Telnet credentials (Mirai, Gafgyt, etc.). I am trying to use Twisted for this purpose, since it seems to be the state-of-the-art technology for such purposes.
This is what I have made so far:
...ANSWER
Answered 2017-Sep-06 at 14:36Here's your use of Deferred:
QUESTION
This is a newbie question: I have these two classes that I needed to get a specific list.
...ANSWER
Answered 2017-Sep-07 at 13:13Assuming you want all the customers with a "New York City" address and ALL their addresses (hierarchical), you would simply do this:
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