Hermes

Hermes is Utopia's main logging utility. It handles local environments by logging to standard output or AWS CloudWatch Logs for our deployed environments.

How to use

First import and initialise Hermes.

import (
  "github.com/FutureAdLabs/hermes"
)

...

func main() {
...
  // Initialise it with your service name
  hermes.Init("sso")
...
}

Once done, you can get a logger from Hermes anywhere!

import (
  "github.com/FutureAdLabs/hermes"
)
func myFunc() {
  logger := hermes.Logger()

  logger.Info().Msg("beep boop this is a log")
}

The logging library Hermes uses is zerolog. To know more about how to use it https://github.com/rs/zerolog.

Troubleshooting

• Hermes does NOT create LogGroups on CloudWatch (the LogGroup name to use is selected as ${YOUR_SERVICE}-${ENVIRONMENT} (e.g. sso-testing).
• Hermes DOES create LogStreams inside the LogGroup. It uses the HOSTNAME env variable to decide the stream name. Each Pod in Kubernetes has its own hostname.
• Hermes differentiates between environments based on the ENV environment variable. For local development ENV=dev, otherwise it should match the deployed env as ENV=testing or ENV=production