Temporal Intro Workshop

This repository contains example code for my Temporal Intro Workshop. You can create your own Workshop with my Workshop template.

Record: https://youtu.be/UwdGmdTO3Ts

Record (HUN): https://youtu.be/IGAnWQ52xOI

Prerequisites

Git, Make, etc.
Make sure you have the latest Go and Docker installed

Alternatively, install nix and direnv, then run direnv allow once you checked out the repository.

Note: you should still install Docker using your native package manager.

Usage

Checkout this repository
Run make up
Wait for Temporal to start
Check if Temporal is running with make ps
Start a new shell with make shell

Alternatively, you can use the following alias for the tctl commands instead of opening a new shell:

alias tctl='docker compose exec --profile cli temporal-admin-tools tctl'

Running a workflow using the CLI

You can run a workflow using the CLI with the following command:

tctl workflow run --taskqueue workshop --execution_timeout 60 --workflow_type WORKFLOW_TYPE -i 'arg1 arg2...'

As a best practice, workflows generally have a single input struct (to remain compatible with other languages). By default, Temporal uses JSON encoding, so such workflow execution looks like this:

tctl workflow run --taskqueue workshop --execution_timeout 60 --workflow_type example01 -i '{"A": 1, "B": 2}'

You can shorten the command a lot by using shorthands for commands and options:

tctl wf run --tq workshop --et 60 --wt example01 -i '{"A": 1, "B": 2}'

Last, but not least, if you want to start a workflow without waiting for its result, you can do so by using the start command instead of run:

tctl wf start --tq workshop --et 60 --wt example01 -i '{"A": 1, "B": 2}'

Quering workflow state using the CLI

Workflows can register query handlers to expose state about themselves. You can query that state using the following command:

tctl workflow query --workflow_id 72daa600-3cac-49b0-9e86-277a47c80a87 --query_type current_number

Or using a shorter version:

tctl wf query --wid 72daa600-3cac-49b0-9e86-277a47c80a87 --qt current_number

There is a special query type called __stack_trace that gives you the current stack trace of the workflow. Useful if a workflow is stuck for a long time and you want to check where it stopped.

Signaling a workflow using the CLI

Workflows can register query handlers to expose state about themselves. You can query that state using the following command:

tctl workflow signal --workflow_id 72daa600-3cac-49b0-9e86-277a47c80a87 --name set_number --input '2'

Or using a shorter version:

tctl wf signal --wid 72daa600-3cac-49b0-9e86-277a47c80a87 -n set_number -i '2'

There is a special query type called __stack_trace that gives you the current stack trace of the workflow. Useful if a workflow is stuck for a long time and you want to check where it stopped.

Cleaning up

Once you are finished with the workshop, you can clean up all resources (containers) by running the following command:

make down

Development

Make sure nix and direnv are installed, then run direnv allow.

To work on the slides, run make slides. It will open a browser window and automatically refresh the page when you make changes to the slides.

License

The MIT License (MIT). Please see License File for more information.

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