grafana/pkg/codegen/tmpl/plugin_lineage_file.tmpl

{{ template "autogen_header.tmpl" .Header -}}
package {{ .PackageName }}

import (
	"embed"
	"fmt"
	"path/filepath"
	"sync"

	"github.com/grafana/grafana/pkg/cuectx"
	"github.com/grafana/grafana/pkg/plugins/pfs"
	"github.com/grafana/thema"
)

var parseOnce sync.Once
var ptree *pfs.Tree

//go:embed plugin.{{ if .RootCUE }}cue{{ else }}json{{ end }}{{ if .HasModels }} models.cue{{ end }}
var plugFS embed.FS

// PluginTree returns the plugin tree representing the statically analyzable contents of the {{ .PluginID }} plugin.
func PluginTree(rt *thema.Runtime) *pfs.Tree {
	var err error
	if rt == nil || rt == cuectx.GrafanaThemaRuntime() {
		parseOnce.Do(func() {
			ptree, err = pfs.ParsePluginFS(plugFS, cuectx.GrafanaThemaRuntime())
		})
	} else {
		ptree, err = pfs.ParsePluginFS(plugFS, rt)
	}

	if err != nil {
		// Even the most rudimentary testing in CI ensures this is unreachable
		panic(fmt.Errorf("error parsing plugin fs tree: %w", err))
	}

	return ptree
}

{{ $pluginfo := . }}{{ range $slot := .SlotImpls }}
// {{ .SlotName }}Lineage returns the Thema lineage for the {{ $pluginfo.PluginID }} {{ $pluginfo.PluginType }} plugin's
// {{ .SlotName }} ["github.com/grafana/grafana/pkg/framework/coremodel".Slot] implementation.
func {{ .SlotName }}Lineage(rt *thema.Runtime, opts ...thema.BindOption) (thema.Lineage, error) {
  t := PluginTree(rt)
  lin, has := t.RootPlugin().SlotImplementations()["{{ .SlotName }}"]
  if !has {
    panic("unreachable: lineage for {{ .SlotName }} does not exist, but code is only generated for existing lineages")
  }
  return lin, nil
}

// The current schema version of the {{ .SlotName }} slot implementation.
//
// Code generation ensures that this is always the version number for the latest schema
// in the {{ .SlotName }} Thema lineage.
var currentVersion{{ .SlotName }} = thema.SV({{ .LatestMajv }}, {{ .LatestMinv }})

{{ end }}