relay | Golang library to help construct | GraphQL library
kandi X-RAY | relay Summary
kandi X-RAY | relay Summary
A Go/Golang library to help construct a graphql-go server supporting react-relay. See a live demo here: Source code for demo can be found at
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of relay
relay Key Features
relay Examples and Code Snippets
import {Environment, Network, RecordSource, Store} from 'relay-runtime';
import {execute, makePromise} from 'apollo-link';
import {HttpLink} from 'apollo-link-http';
import {parse} from 'graphql';
const link = new HttpLink({
uri: 'http://localhost
Community Discussions
Trending Discussions on relay
QUESTION
I've written a Pi Hardware Interface Server (phis) that uses http protocol to control the hardware connected to my Raspberry Pi (relays, analog measurements, etc). It processes simple requests and responds with plain text. It has been working flawlessly for years and I have written extensive browser-based interfaces to the system. Here's the basic structure:
...ANSWER
Answered 2021-Jun-13 at 18:07Found the answer in this post ("Duh" moment the instant I saw it!)
I had forgotten to close the connected and listening sockets in the forked child, which were inherited by the spawned daemon and stayed open as long as it runs. Here's the code I'm using to spawn a process that will be left running (daemonized):
QUESTION
I'm using FastAPI and I need to represent different STIX 2 objects (from MITRE ATT&CK) with a corresponding/equivalent Pydantic model in order to return them as a response JSON.
Let's consider the AttackPattern object.
...ANSWER
Answered 2021-Jun-11 at 08:46A possible and promising approach is to generate the Pydantic model starting from the corresponding JSON Schema of the STIX object.
Luckily enough the JSON schemas for all the STIX 2 objects have been defined by the OASIS Open organization on the GitHub repository CTI-STIX2-JSON-Schemas.
In particular, the JSON Schema for the Attack-Pattern is available here.
QUESTION
I am using the free TURN server provided by https://numb.viagenie.ca/. The STUN servers are also public.
I am using the following configuration:
...ANSWER
Answered 2021-Mar-17 at 16:54Before setting up a brand new TURN server you can try to understand what's actually happening: if you take a trace on the computer with an application like Wireshark, and filter for stun
messages, you should be able to see the browser sending Binding Request and Allocate Request methods towards the TURN server.
A missing response from the server may mean that the server is not available, the port is wrong, or a firewall prevents the browser to reach the TURN server.
If instead the credentials are wrong, the browser will receive a 401 error to the Allocate Request with the message-integrity attribute.
You can also verify the TURN URL and credentials by running the WebRTC sample application that deals with ICE candidate gathering at https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice/ .
QUESTION
I want to observe two behaviorRelays
with a single observer
, wait for both relays
to emitt their values, then in the subscription
have two seperate closure arguemts
, one for each relay
. Something like this:
ANSWER
Answered 2021-Jun-10 at 14:22you can use combineLatest:
combineLatest is an operator which you want to use when value depends on the mix of some others Observables. When an item is emitted by either of two Observables, combine the latest item emitted by each Observable via a specified closure and emit items based on the results of this closure.
For reference follow this - combineLatest meduim link
QUESTION
I have a view like custom popup, in it I have a button.
I observe tap on it with the help of let tap = button.rx.tap
When this button had been tapped, l need to make action in my viewModel - for example, print "tap" and push action into relay, but l can't understand, how to bind whem together.
I try to make it in my viewModel:
...ANSWER
Answered 2021-Jun-09 at 01:34First, let's clear up a misconception. The view model is not where you "make action." The view model is where you want logic. There should not be any relays, subjects or observers in your view model. It should be Observables in, Observables out.
Second, when defining an Observable chain, much like when you are defining a formula in a cell of an Excel spreadsheet, the final result, the thing you want to ultimately do, is the most important part but that is the one thing you haven't described. I doubt that all you want to do is print something.
Third, a Subscription, just like a use-case, consists of a Cause and Effect, with Logic transforming the cause into an effect. The Logic is what goes in the view model, an here the only logic you have described is that "tap" should be the output every time the button is tapped.
So as it stands, the entire use-case you have described is "when the user taps the button, the system should print 'tap'." With only that to go on, we have a Cause (the button tap), the Logic (the word "tap" once per tap) and the Effect (print something.) Which would be modeled like this:
QUESTION
I have a page on which the user can click a link and a panel slides in from the right to cover half of the page. It only uses CSS
, no JS
, and it works fine usually.
However, the main part of the page has an element and as soon as I add a
URL
to it, the panel opening behavior goes strange - the panel does slide in, but the main page contents jump offscreen and slide in from the left. Here's a minimal example.
ANSWER
Answered 2021-Jun-08 at 14:56The issue is coming from your targeted element being transitioned in off screen. When you click on the anchor, the #panel
element is in focus/selected, and the browser will attempt to move the viewport in a way such that the element remains visible in the viewport. Since your element is rendered outside the viewport but slides in after, this causes the browser to keep adjusting its horizontal scroll position to keep it in view.
A possible workaround is to simply wrap the contents of #panel
in an inner
#panel
always remains on screen in a way:
QUESTION
I am running a main python program on a Windows PC that is hooked to equipment that cannot be ran on an Raspberry pi. At a certain point in the main program, I want to call/execute a Rpi program to run. I need the GPIO pins from the Rpi to turn on a relay/s. Is there a way to wirelessly(or serially) open and run the program on the raspberry pi from the main program already running on the Windows PC?
Maybe I am not thinking of something, is there an easier and just as cheap solution to turn on a relay from the Windows PC program?
Any points in the right direction would be greatly appreciated.
...ANSWER
Answered 2021-Jun-06 at 15:30depending on security requirements. Assuming that the Desktop PC and raspberry pi are on the same network, you could create an HTTP REST endpoint on the pi, you could use flask or fastapi for this. then call that from the app running on the desktop. for help with flask see https://flask.palletsprojects.com/en/2.0.x/ if you are familiar with python flask is fairly simple to get started with.
QUESTION
I have an AWS Amazon Linux 2 box. I am using a python script (Python 3.7) to send an email using Sendgrid as the SMTP service. I can send the email using $ python3 send_email.py
but, when I use crontab ($ crontab -e
then * * * * * python3 ~/apps/send_email.py
), the error in the log file /var/log/cron
is (CRON) EXEC FAILED (/usr/sbin/sendmail): No such file or directory
. The crontab is working as expected (I've tested other cron commands and they work fine), but the email part is what's not working.
Here's what I've tried to fix it:
- Run the command as a root crontab (ie
$ sudo crontab -e
) - Run the the crontab as a user crontab (ie
$crontab -e)
), but withsudo python3 ...
in the crontab command. - Add the path directory at the top of the crontab file in case those directories couldn't be resolved
- Installed Postfix to install something in the
/usr/bin/sendmail
directory but, since I don't need it to run the Sendgrid-powered email using$ python3 send_email.py
, I'm not sure why I would need it through cron. I could be totally wrong on this, though. With Postfix installed, it resolves the(CRON) EXEC FAILED (/usr/sbin/sendmail): No such file or directory
error in the cron log - the log entry in that case is(ec2-user) CMD (python3 ~/apps/send_email.py)
- but I don't receive an email. Probably because Postfix isn't configured for the SMTP I'm using (Sendgrid). - (EDIT) I have configured Sendgrid to work with Postfix via the Sendgrid docs but it still won't send me an email although it looks like nothing is erroring out in the Postfix logs...
ANSWER
Answered 2021-Jun-05 at 20:28I was able to finally resolve this after much troubleshooting. Here's what worked.
- I kept the original setup the same: Sendgrid for SMTP using their python lib (no Postfix or smtplib), using user crontab (using
$ crontab -e
not$ sudo crontab -e
), and using Python 3.7. - Apparently the word 'email' in the python script name can cause interpreter issues so I renamed the file to remove the word 'email'. For example,
send_noti.py
instead ofsend_email.py
- I used absolute paths for every call to a file in the python script. I was reading, writing, and executing files in the user directory in my python script as well as sending an email. Those R,W,X commands started erroring out in cron but not when called from outside of cron for some reason, even after renaming the file. Using absolute paths for all references to files fixed that.
- I also used the absolute path for the python file in the crontab file. For example,
* * * * * python3 /home/ec2-user/apps/send_noti.py
instead of* * * * * python3 ~/apps/send_noti.py
- I removed the unnecessary items in the crontab file I had put in before such as redefining the PATH directory.
I hope this helps someone because this took me about 3 weeks to troubleshoot and figure out.
QUESTION
I have JSON response with an array but is not mapping and throwing error, how I can handle JSON like this
...ANSWER
Answered 2021-Jun-05 at 12:02As commented, Jackson
doesn't find "ID" field so it throws an exception. You can add @JsonProperty("ID")
on top of id
field in ItemDto
:
QUESTION
I have a collection devices
of documents having a field name
with 5 possible string values 'LIGHT', 'TEMP', 'SOUND', 'INFRARED', 'RELAY'
. How do I query for only documents with field name
not equal both 'INFRARED'
and 'RELAY'
?
The solution I thought of was to use compound query
...ANSWER
Answered 2021-Jun-05 at 00:58There is now not-in
- similar to in
which matches a single field to any entry in an array, but in this case NOT in the array.
https://firebase.google.com/docs/firestore/query-data/queries#in_not-in_and_array-contains-any
Limited to an array of 10 entries or less, which fits your use-case of two values.
Also Note: any field used in a query will automatically reject
all documents that do not have that field.
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