https://github.com/avinashupadhya99/productcatalogservice

https://github.com/avinashupadhya99/productcatalogservice

Last synced: 16 days ago
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• Host: GitHub
• URL: https://github.com/avinashupadhya99/productcatalogservice
• Owner: avinashupadhya99
• Created: 2022-10-05T16:43:41.000Z (over 2 years ago)
• Default Branch: main
• Last Pushed: 2022-10-07T15:01:54.000Z (over 2 years ago)
• Last Synced: 2025-01-10T08:47:44.684Z (22 days ago)
• Language: Go
• Size: 54.7 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# productcatalogservice

Run the following command to restore dependencies to `vendor/` directory:

    dep ensure --vendor-only

## Dynamic catalog reloading / artificial delay

This service has a "dynamic catalog reloading" feature that is purposefully

not well implemented. The goal of this feature is to allow you to modify the

`products.json` file and have the changes be picked up without having to

restart the service.

However, this feature is bugged: the catalog is actually reloaded on each

request, introducing a noticeable delay in the frontend. This delay will also

show up in profiling tools: the `parseCatalog` function will take more than 80%

of the CPU time.

You can trigger this feature (and the delay) by sending a `USR1` signal and

remove it (if needed) by sending a `USR2` signal:

```

# Trigger bug

kubectl exec \

    $(kubectl get pods -l app=productcatalogservice -o jsonpath='{.items[0].metadata.name}') \

    -c server -- kill -USR1 1

# Remove bug

kubectl exec \

    $(kubectl get pods -l app=productcatalogservice -o jsonpath='{.items[0].metadata.name}') \

    -c server -- kill -USR2 1

```

## Latency injection

This service has an `EXTRA_LATENCY` environment variable. This will inject a sleep for the specified [time.Duration](https://golang.org/pkg/time/#ParseDuration) on every call to

to the server.

For example, use `EXTRA_LATENCY="5.5s"` to sleep for 5.5 seconds on every request.