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components.md

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Components

An overview of all the components in this repo, and related components needed to run this service.

Included in this repo

  • downloader: Takes download items from the queue, downloads an issue's details from the GitHub API, stores their values onto the disk, and then adds an index item onto the queue.
  • indexer: Takes index items from the queue, and imports JSON files from the disk into ElasticSearch.
  • elasticsearch: Indexed storage, containing all issue information, and provides APIs to query and consume the data.
  • kibana: Web UI for accessing ElasticSearch data, allowing quick and easy quering, and building data visualizations.
  • queue-cli: Small helper tool that allows manual modifications to the queue, like manually queuing issues for download, or checking the current queue state.
  • redis: Small key-value storage, responsible for holding queue items.
  • reverse-proxy: nginx image with pre-defined config, responsible for making sure that the right requests end up at the right components. For example, serving Kibana at /kibana/, or exposing the webhook-receiver on /webhooks/.
  • webhook-receiver: HTTP server to receive GitHub Webhook notifications. If a webhook is received, the receiver will add a download queue item.

External components, and additional stuff not in this repo

  • External reverse proxy/Load Balancer: The docker-compose stack does not listen on public ports, it just listens on 127.0.0.1:8080 with an HTTP-only connection. You are responsible for making sure the application is available from the internet. An example configuration for nginx can be found in /_docs/additional-files/external-nginx.conf, adapt as needed.
  • Cronjobs/systemd-timer: This repository contains two scripts at /src/scripts/: make-snapshot and remove-old-snapshots. These scripts are responsible for creating daily snapshots of web-bug data, and for deleting snapshots older than one week. It is your responsibility to make sure those scripts are called once per day.
  • Backups: You absolutely should back up the data generated by this app to external backup storage. /_docs/backups.md contains additional details and hints.