2020-08-14 22:53:59 +00:00
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# Architecture Guide
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This guide describes the program architecture.
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## Contents
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- [Architecture Guide](#architecture-guide)
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- [Contents](#contents)
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- [Summary](#summary)
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- [Labels](#labels)
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- [Flag Labels](#flag-labels)
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- [Change Sets](#change-sets)
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- [State Labels](#state-labels)
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- [State Values](#state-values)
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- [State Changes](#state-changes)
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- [Remote](#remote)
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- [Github Remote](#github-remote)
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- [Gitlab Remote](#gitlab-remote)
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- [Sync](#sync)
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- [Sync Issues](#sync-issues)
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- [Sync Projects](#sync-projects)
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2020-08-22 22:29:19 +00:00
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## Summary
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2020-08-22 22:29:19 +00:00
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`cautious-journey` is a label manager and state machine for remote APIs. It creates and updates labels to match
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the configuration, can replace labels to create complex workflows, and supports multiple projects with shared or
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unique labels.
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2020-08-22 22:29:19 +00:00
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## Labels
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Labels come in two varieties: individual flags and mutually-exclusive states. These are equivalent to
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checkboxes and radio groups in web forms, with the state changes between values forming a state machine within
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each group of state labels.
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2020-08-22 22:29:19 +00:00
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### Flag Labels
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Flag labels are set individually. They support basic change sets, like `adds` and `removes`. While flags are
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independent by default, they can depend on other labels in `requires`.
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#### Change Sets
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If the flag in question is present on an issue, then:
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- the labels listed in `adds` will be added
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- the labels listed in `removes` will be removed
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### State Labels
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State labels are set from a group of values. Only one value from each state may be present at a time; if more than
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one value exists, the highest priority will be kept. Each value can define a set of potential state changes, which
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will replace the current value with another label (flag or state value).
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#### State Values
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State values are mutually exclusive, but are normal labels in other ways. They support basic change sets, like
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`adds` and `removes`, along with a set of potential changes in `becomes`.
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#### State Changes
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State labels may replace one value with another using normal change rules, with the addition
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of a list of matching labels that must be present for the state change to be resolved.
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For example, a state with three values like so:
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```yaml
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projects:
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- name: foo
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flags:
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- name: next
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states:
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- name: status
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values:
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- name: new
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becomes:
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- adds: [status/in-progress]
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matches: [next]
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- name: in-progress
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becomes:
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- adds: [status/done]
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matches: [next]
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- name: done
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becomes:
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- adds: [status/new]
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matches: [next]
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```
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Each time `cautious-journey` evaluates the labels on this project, any issues with the `status/new` **and** `next`
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labels will be promoted to `status/in-progress`, and both the `status/new` and `next` labels will be removed.
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2020-08-14 22:53:59 +00:00
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## Remote
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2020-08-22 22:29:19 +00:00
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`cautious-journey` typically connects to some remote service to manage labels there. You can choose which remote
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should be used for each project.
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### Github Remote
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Connects to a Github repository.
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- `type: github-remote`
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- `data:`
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- `type: app`
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- `appId`
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- `installationId`
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- `privateKey`
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- `type: token`
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- `token`: personal token with `repo` scope
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### Gitlab Remote
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Connects to a Gitlab repository.
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- `type: gitlab-remote`
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- `data:`
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- `type: token`
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- `token`: personal access token with `api` scope
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## Sync
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Update issue labels or the labels themselves.
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### Sync Issues
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2020-08-22 22:29:19 +00:00
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Update issue labels by resolving state changes and other change sets.
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### Sync Projects
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2020-08-22 22:29:19 +00:00
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Update project labels to match the `flags` and `states` provided in the config.
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The project config is considered the source of truth when syncing projects, and the remote labels will be
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updated to match the config.
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