44bd1446f5
- docs/backend: admin controllers, forms, lists and filters, relation manager, users and permissions, settings, partials and widgets, admin SPA - docs/services: storage, outbound HTTP, realtime, Web Push, search, parity testing and the Frontend and AJAX (not provided) page - Examples for cabana (with testdata/docs YAML), fetchguard, lighthouse and its centrifugo driver, flare, beachcomber and typesense, tide; lighthouse and beachcomber TestDocs* regions run on their Postgres harnesses - concept map rows link their guide pages and the not-provided rows the Frontend and AJAX page; index lists Backend, Database and Services - TestDocsRequiredPages asserts the D-08 section order
98 lines
4.5 KiB
Markdown
98 lines
4.5 KiB
Markdown
---
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title: Configuration
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description: Read layered configuration with compass, from plugin defaults through per-environment files and SUMMER_ variables to runtime overrides saved to disk.
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section: services
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order: 10
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---
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# Configuration
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WinterCMS reads configuration with `Config::get('app.name')` from `config/*.php`, per-environment directories and `.env`. SummerCMS reads it from a `compass.Config` built by [compass](../../modules/compass/README.md), with the same dot paths. [Setup, Configuration](../setup/configuration.md) lists the keys an application sets; this page covers how the layers merge and how code reads and changes them.
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## Layers
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`compass.Config` merges its sources in a fixed order. Each layer overrides the ones before it:
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1. Plugin defaults, merged with `compass.Config.MergePlugin` when the plugin is activated. A plugin's `config/config.yaml` becomes `<plugin id>.<key>`, so `acme.blog.posts_per_page` is the WinterCMS `acme.blog::posts_per_page`. Any other `config/<name>.yaml` becomes `<plugin id>.<name>.<key>`.
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2. `config/*.yaml`. Each file is a section named after the file, so `config/app.yaml` provides `app.*`.
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3. `config/env/<environment>/*.yaml`, the per-environment sections.
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4. `SUMMER_` environment variables and the `.env` file next to `config/`. `SUMMER_MAIL__DRIVER` sets `mail.driver`: the prefix is removed, `__` separates the path segments and the name is lower-cased. A `.env` value applies only when the real environment does not set the same variable.
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5. `config/env/<environment>/overrides.yaml`, written by `compass.Config.Persist`.
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6. Values set in memory with `compass.Config.Set`.
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The environment comes from `SUMMER_ENV` and defaults to `production`. Its name may contain only letters, digits, `-` and `_`.
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## Reading values
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The typed getters `compass.Config.String`, `compass.Config.Int` and `compass.Config.Bool` return the zero value for a missing key. Use `compass.Config.Lookup` or `compass.Config.Has` when a missing key must be told apart from a zero value, and `compass.Config.LoadSection` to read a whole section into a struct with `koanf` tags:
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```go src=modules/compass/example_test.go#ExampleOpen
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dir, err := os.MkdirTemp("", "acme-config")
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if err != nil {
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fmt.Println(err)
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return
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}
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defer os.RemoveAll(dir)
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if err := writeConfig(dir); err != nil {
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fmt.Println(err)
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return
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}
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// Environ stands in for the process environment (nil reads os.Environ).
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cfg, err := compass.Open(compass.Options{
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Dir: dir,
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Env: "development",
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Environ: []string{"SUMMER_MAIL__DRIVER=smtp"},
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})
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if err != nil {
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fmt.Println(err)
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return
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}
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// A plugin's embedded config/config.yaml becomes its defaults.
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plugin := fstest.MapFS{"config/config.yaml": {Data: []byte("posts_per_page: 10\n")}}
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if err := cfg.MergePlugin("acme.blog", plugin); err != nil {
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fmt.Println(err)
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return
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}
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fmt.Println(cfg.String("app.name"), cfg.Bool("app.debug"), cfg.Int("acme.blog.posts_per_page"))
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var mail mailSettings
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if err := cfg.LoadSection("mail", &mail); err != nil {
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fmt.Println(err)
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return
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}
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fmt.Println(mail.Driver, mail.From)
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_, found := cfg.Lookup("app.timezone")
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fmt.Println(cfg.Environment(), found)
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// A runtime override, saved to env/development/overrides.yaml.
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if err := cfg.Set("acme.blog.posts_per_page", 25); err != nil {
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fmt.Println(err)
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return
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}
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if err := cfg.Persist(); err != nil {
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fmt.Println(err)
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return
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}
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saved, _ := os.ReadFile(filepath.Join(dir, "env", "development", "overrides.yaml"))
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fmt.Print(string(saved))
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// Output:
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// Acme true 10
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// smtp blog@example.com
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// development false
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// acme:
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// blog:
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// posts_per_page: 25
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```
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The application opens its configuration once with `compass.Load("config")` in the generated `main` and hands it to the `backpack.App`. Plugins read it through `app.Config` and never open their own.
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## Changing values at runtime
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`compass.Config.Set` changes a value in memory. `compass.Config.Persist` saves every value set at runtime to `config/env/<environment>/overrides.yaml`, keeping the keys already saved there. It replaces the file atomically, creates it readable only by its owner and refuses any path outside the config directory. `compass.Config.Reload` rereads every source and discards values that were set but not persisted.
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Values that admins edit in the backend are not configuration: settings pages store them in a database row; see [Settings](../backend/settings.md).
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> [!WARNING]
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> `overrides.yaml` is written by the running application. Keep it out of version control, and keep secrets in environment variables rather than in values the application persists.
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