statemachine | Simple finite-state machines in Python
kandi X-RAY | statemachine Summary
kandi X-RAY | statemachine Summary
If you aren't programming with state machines, you should be. statemachine offers a simple and easy-to-use finite-state machine that can adapted into almost any code base.
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Top functions reviewed by kandi - BETA
- Decorator to perform transition
- Check if a transition is a transition
- Transition from from to_state
- Decorator to create a transition
- Transition to to_state
- Create a transition after transition
- Create a before transition
statemachine Key Features
statemachine Examples and Code Snippets
Lines of Code : 58License : Permissive (MIT)
Copyimport statemachine
class TrafficLight(statemachine.Machine):
initial_state = 'red'
>>> stoplight = TrafficLight()
>>> stoplight.state
'red'
import statemachine
class TrafficLight(statemachine.Machine):
initial_state = ' $ pip install statemachine
Community Discussions
Trending Discussions on statemachine
QUESTION
I am a beginner to rive and flutter. I am building a favorite items page in flutter. If there are not anything added to favorites I need to show a riveAnimation on screen. I already implemented almost everything to show the animation on screen. But I need to toggle a jumping animation when user tap on the animation which is really cool. for now I have the animation on 'Idle' mode
You may want to refer to the rive file => Go to Rive. And I renamed Rive stateMachine name to Bird. Everything else is the same.
summary => I want bird to jump when user tap on him :)
The code and the image may be little bit bigger. Sorry about that
...ANSWER
Answered 2022-Apr-17 at 19:07If you open/run rive file on rive site, you can find that it is using Trigger variable for jumping and it is using State Machine 1 state machine.
Next thing comes about declaring variable. You need to use SMITrigger data type for this and use StateMachineController to control the animation.
Use .findSMI(..) instead of .findInput() for SMITrigger.
To start animation on trigger, use
QUESTION
I'm trying to use SignalR in my Xamarin Forms project.
It works perfectly when I'm using Android (device or simulator).
But using the same code on iOS, it hangs at await hubConnection.StartAsync();
I'm using Visual Studio 2022. XAML hot reload is disabled. I've tried adding the System.Memory and System.Buffers IncludeAssets None fix.
Here's the code
...ANSWER
Answered 2022-Mar-24 at 14:13Well I had only half of the solution implemented.
What fixed it for me was adding this to BOTH the common AND iOS projects. Not only the common project.
QUESTION
I was trying to deploy a practice project to Heroku and it gets deployed. However there is a application error, which is preventing the app to run on the server. I got some details about the errors, after running heroku logs.
ANSWER
Answered 2022-Mar-13 at 01:40I solved this by not having node_modules in my .gitignore folder which was there originally.
QUESTION
I have been able to use awscli to get start the execution but I need to be able to know when is completed or result is success before it can go to the next step in the pipeline.
aws stepfunctions start-execution --state-machine-arn arn:aws:states:us-west-2:2xx244xxxx:stateMachine:SamplePipeOrchestration-ftpiles --name SamplePipeOrchestration-ftpiles --input {} --region us-west-2 --profile sampledev
ANSWER
Answered 2022-Mar-01 at 00:02You have to develop your own waiter in a form a loop which iteratively queries (e.g. every 10s) the status of your execution (e.g. using describe-execution and checks for a successful or failed completion.
QUESTION
I'm working on a project with this workflow : an API Gateway (defined using open api) trigger a Step function from AWS. There is 2 steps, and in case of errors, there is a catch block in the State machine definition.
But I'm facing an issue with error handling. Even if my code throw an error (400 for example), my Postman (or other REST API testing tools) respond with a 200. And I would like to have a 500/400...
Here is the code :
Step function definiton as serverless
...ANSWER
Answered 2021-Aug-03 at 13:30After a quick scan of your code I think you've missed two things.
Firstly, in the step function, your error state is of type "Fail" which means that the step function stops and nothing is returned to the API Gateway so all it can do is report the 200 (or the default status code set in the open api definition).
To get a non-standard status code back to the client, you have to return something from the step function and then use a data transformation in the API Gateway to override the status function.
So your fallback state should be of type "Pass" and output the error information, including a status code.
And then you detect that status code in the Gateway and use it to override the response status code using a velocity template.
Take a look at https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-override-request-response-parameters.html for an example.
QUESTION
I'm aware of many posts regarding these warnings in Chrome dev tools. For all of them, the solution is to turn off notifications "Enable javascript source maps" and "Enable CSS source maps".
What I want to know is how to FIX this and what is the reason under the hood that causes these warnings.
I'm currently developing a Vue JS app that uses Twilio Js SDK
and I'm getting tons of warnings when the app is built in stage mode by using sudo npm run build -- --mode staging
Any advice will be appreciated.
...ANSWER
Answered 2022-Feb-05 at 08:12Twilio developer evangelist here.
Do you need to turn on sourcemaps in webpack, like in this GitHub issue?
QUESTION
I am having a lot of issues handling concurrent runs of a StateMachine (Step Function) that does have a GlueJob task in it.
The state machine is initiated by a Lambda that gets trigger by a FIFO SQS queue.
The lambda gets the message, checks how many of state machine instances are running and if this number is below the GlueJob concurrent runs threshold, it starts the State Machine.
The problem I am having is that this check fails most of the time. The state machine starts although there is not enough concurrency available for my GlueJob. Obviously, the message the SQS queue passes to lambda gets processed, so if the state machine fails for this reason, that message is gone forever (unless I catch the exception and send back a new message to the queue).
I believe this behavior is due to the speed messages gets processed by my lambda (although it's a FIFO queue, so 1 message at a time), and the fact that my checker cannot keep up.
I have implemented some time.sleep() here and there to see if things get better, but no substantial improvement.
I would like to ask you if you have ever had issues like this one and how you got them programmatically solved.
Thanks in advance!
This is my checker:
...ANSWER
Answered 2022-Jan-22 at 14:39You are going to run into problems with this approach because the call to start a new flow may not immediately cause the list_executions() to show a new number. There may be some seconds between requesting that a new workflow start, and the workflow actually starting. As far as I'm aware there are no strong consistency guarantees for the list_executions() API call.
You need something that is strongly consistent, and DynamoDB atomic counters is a great solution for this problem. Amazon published a blog post detailing the use of DynamoDB for this exact scenario. The gist is that you would attempt to increment an atomic counter in DynamoDB, with a limit expression that causes the increment to fail if it would cause the counter to go above a certain value. Catching that failure/exception is how your Lambda function knows to send the message back to the queue. Then at the end of the workflow you call another Lambda function to decrement the counter.
QUESTION
I'm using swifts stateMachine from gamePlayKit. It works great, but there is one thing I don't understand: The stateMachineseems to be its own isolated island; from what I can tell there is no way to pass in arguments or get callbacks. And this raises questions like, how do I update the UI?
Lets say I enter combat state:
...ANSWER
Answered 2022-Jan-31 at 20:54I totally recommend you check the DemoBots project from Apple.
You should pass the entity reference on the State Initializer
For example
QUESTION
I am sure I am missing some basic info but my setup is as follows:
I have 1 lambda function and I have 2 State Machines. Each state machine is calling the same lambda function twice in sequence (30 sec pause between calls) Then I have rules setup to trigger the state machines every minute. Below is what each of my state machines look like, each lambda invoke is for the same function.
Each state machine is passing different params to the lambda function so I am trying to get to a situation where my Lambda function is called every 30 seconds with 1 set of params (from statemachine 1), and the same lambda function is called with a different set of params (via statemachine 2) every 30 seconds.
Looking at the lambda function logs it looks like the state machines will not run the lambda function until the other state machine has completed its entire execution (ie calling the lambda function twice). I would expect that the two state machines would run independently of each other and there would be no timing dependency between them?
Is there some limitation because they are all calling the same lambda function? Or is there some setup issue or is this just how it works?
Thanks!
...ANSWER
Answered 2022-Jan-18 at 09:03From the documetation:
When you invoke a Lambda function, the execution will wait for the function to complete. However, it is possible to call Lambda asynchronously using the InvocationType parameter, as seen in the following example
To avoid waiting for oneLambda function to end and continue your step function you have to set the InvocationType to Event in the parameters. However, if your Lambda functions are completely independent from one another using the Parallel execution type may be a better option for you.
QUESTION
I am trying to build a statemachine in C++ using variadic templates.
...ANSWER
Answered 2022-Jan-15 at 16:35You need to use using-declaration to introduce the default implementation into the derived class definition
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Install statemachine
You can use statemachine like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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