healthcheck

Description

This npm module contains various healthchecks in order to retrieve the status from different sources like dbs, filesystems or upstream services.

elasticsearch

• read+write check by incrementing a counter within a document, if index or document does not exist yet it is created on first run

mongodb

• read+write check by creating a new document with a random testvalue in a capped collection of max 1 document on each run

postgres

• read+write check by incrementing a counter stored within a sequence, if sequence does not exist yet it is created on first run

redis

• read+write check by incrementing a counter associated with a specific key, if key does not exist yet it is created on first run

success

• dummy check for testing purposes which does not perform any tests and always returns true

upstream

• performs a GET request to /alive endpoint and resolves check successfully if a http status code of 200 OK is returned

filesystem

• read+write check by creating and removing a file in a temporary directory

Development

Before starting development

• Install npm packages: make npm or npm install
• Build service dependencies (docker images): make build-dev-images
• Start service dependencies (docker container): make dev-inf-up
• Watch for file changes: npm run watch
  • alternatively press ⇧⌘B to execute default task runner in vscode

During development

• Run test suite: npm run test
• Commit your changes into a separare feature branch using semantic commit messages
• Regulary push your changes to remote origin

After finishing development

• Stop service dependencies: make dev-inf-down
• Push your changes to remote origin
• Create a pull request from feature branch to branch Development via the Webinterface of git server
  • Add a reviwer to the pull request
• Check CI/CD Pipeline result

Publishing

• Sign in to registry with npm adduser --registry=<registry> --always-auth
• Update version number in package.json file
• Make sure to update .npmignore file
• Run npm publish --registry=<registry> to push latest version to private registry
• Signin to the registry and verify result