summercms/examples/hello/plugins/greeter/plugin.go

package greeter

import (
	"context"
	"fmt"
	"net/http"

	"git.golem15.com/golem15/summercms/backpack"
	"git.golem15.com/golem15/summercms/bonfire"
	"git.golem15.com/golem15/summercms/festival"
	"git.golem15.com/golem15/summercms/pact"
	"git.golem15.com/golem15/summercms/party"
	"git.golem15.com/golem15/summercms/surf"
	"git.golem15.com/golem15/summercms/towel"
)

var (
	_ festival.Collectable = (*HelloEvent)(nil)
	_ festival.Handleable  = (*HelloEvent)(nil)
	_ pact.HasCommands     = (*Plugin)(nil)
	_ pact.HasRoutes       = (*Plugin)(nil)
)

// Plugin is the golem15.greeter plugin. It requires golem15.hello.
type Plugin struct {
	app   *backpack.App
	extra string
}

func (p *Plugin) ID() string         { return "golem15.greeter" }
func (p *Plugin) Requires() []string { return []string{"golem15.hello"} }

func (p *Plugin) Register(*backpack.App) error { return nil }

func (p *Plugin) Boot(app *backpack.App) error {
	p.app = app
	p.extra = ""
	if app != nil && app.HasPlugin("golem15.optional") {
		if msg, ok := app.Lookup[pact.OptionalMessage](); ok {
			p.extra = msg.Message()
		}
	}
	if app != nil && app.Events != nil {
		app.Events.Listen[*HelloEvent]("golem15.greeter", func(ctx context.Context, e *HelloEvent) error {
			if e.data == nil {
				e.data = map[string]any{}
			}
			e.data["source"] = "greeter"
			if actor, ok := towel.Actor(ctx); ok {
				e.data["actor"] = actor
			}
			e.handled = true
			return nil
		})
	}
	return nil
}

func (p *Plugin) Routes(r pact.Router) error {
	r.Get("/items/{id}", func(w http.ResponseWriter, req *http.Request) {
		id, ok := surf.IntParam(req, "id")
		if !ok || id != 1 {
			http.NotFound(w, req)
			return
		}
		w.Header().Set("Content-Type", "application/json")
		fmt.Fprintf(w, `{"id":%d}`, id)
	})
	r.Where("id", `[0-9]+`)
	r.Get("/kinds/{kind}", func(w http.ResponseWriter, req *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		fmt.Fprintf(w, `{"kind":%q}`, req.PathValue("kind"))
	})
	r.WhereIn("kind", "widget", "gadget")
	return nil
}

func (p *Plugin) Commands() []bonfire.Command {
	return []bonfire.Command{{
		Name:        "greeter:hello",
		Description: "Print the configured application name",
		Run: func(ctx context.Context, in bonfire.Input, out bonfire.Output) error {
			name := ""
			posts := 0
			debug := false
			if p.app != nil && p.app.Config != nil {
				name = p.app.Config.String("app.name")
				posts = p.app.Config.Int("golem15.hello.posts_per_page")
				debug = p.app.Config.Bool("app.debug")
			}
			events := "ok"
			collected := ""
			handled := false
			if p.app != nil && p.app.Events != nil {
				if err := p.app.Events.Fire(ctx, &HelloEvent{}); err != nil {
					events = "err"
				}
				payload, err := p.app.Events.Collect(ctx, &HelloEvent{})
				if err != nil {
					events = "err"
				}
				if src, ok := payload["source"].(string); ok {
					collected = src
				}
				ok, err := p.app.Events.UntilHandled(ctx, &HelloEvent{})
				if err != nil {
					events = "err"
				}
				handled = ok
			}
			out.Table([]string{"plugin", "status"}, [][]string{{"golem15.greeter", "active"}})
			if _, err := out.Confirm("show greeting?", true); err != nil {
				return err
			}
			out.Printf("name=%s posts_per_page=%d debug=%t extra=%s events=%s collected=%s handled=%t\n", name, posts, debug, p.extra, events, collected, handled)
			return nil
		},
	}}
}

// HelloEvent is a typed greeter event used to demonstrate Fire, Collect
// and UntilHandled on the app bus.
type HelloEvent struct {
	data    map[string]any
	handled bool
}

func (e *HelloEvent) Collected() map[string]any {
	if e == nil {
		return nil
	}
	return e.data
}

func (e *HelloEvent) IsHandled() bool {
	return e != nil && e.handled
}

func init() {
	party.Register(&Plugin{})
}