replay tutorial

This repo contains a tutorial that introduces developers to the replay framework.

Each sub-folder contains a simple go program. Some are purely examples and can just be studied and run with go run. Others contain TODO(you) that must completed before the program will run successfully.

• 00_helloworld
• 01_typedhello
• 02_signalhello
• 03_outputhello
• 04_restarthello
• 05_cron
• 06_appendonlylog
• 07_makertrade
• 08_sparkline
• 09_parentjob
• 10_distributed
• 11_sharding

TODO

• versioning
• best effort activity consumers

Tips

• Read the replay docs first (can skip Under the hood)

• Read each exercise from top to bottom (including comments).

• Running the programs can be done in IDE's supporting go:generate or from the command line:

go run github.com/corverroos/replaytutorial/00_helloworld
# Exit early with Ctrl-C to test restart robustness

• Regularly install the latest typedreplay code generation tool:

go install github.com/corverroos/replay/typedreplay/cmd/typedreplay@latest

• Some exercises contain //showme:hidden foo directives associated with a TODO(you) instruction. Executing the following go:generate command will show the next 1 solution in the go file. Note that the -hide flag will hide the solutions.

//go:generate go run ../lib/showme 1 

• This tutorial assumes a mysql DB is accessible at mysql://root@unix(/tmp/mysql.sock)/. If not specify the connection url via db_url. Note it creates a long-lived database called replay_tutorial. Use the flag db_refresh to clear the database.

• Experiment!