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database.go
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database.go
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package persistence
import (
"context"
"github.com/b2wdigital/restQL-golang/v6/pkg/restql"
"github.com/pkg/errors"
)
// Database defines the operations exposed by an external store.
type Database restql.DatabasePlugin
// NewDatabase constructs a Database compliant value
// from the database plugin registered.
// In case of no plugin, a noop implementation is returned.
func NewDatabase(log restql.Logger, disabled bool) (Database, error) {
if disabled {
return noOpDatabase{}, nil
}
pluginInfo, found := restql.GetDatabasePlugin()
if !found {
log.Info("no database plugin provided")
return noOpDatabase{}, nil
}
dbPlugin, err := pluginInfo.New(log)
if err != nil {
return noOpDatabase{}, err
}
if dbPlugin == nil {
log.Info("empty database instance returned by plugin", "plugin", pluginInfo.Name)
return noOpDatabase{}, nil
}
database, ok := dbPlugin.(restql.DatabasePlugin)
if !ok {
return noOpDatabase{}, errors.Errorf("failed to cast database plugin, unknown type: %T", dbPlugin)
}
return database, nil
}
var errNoDatabase = errors.New("no op database")
type noOpDatabase struct{}
func (n noOpDatabase) UpdateQueryArchiving(ctx context.Context, namespace string, queryName string, archived bool) error {
return nil
}
func (n noOpDatabase) UpdateRevisionArchiving(ctx context.Context, namespace string, name string, revision int, archived bool) error {
return nil
}
func (n noOpDatabase) Name() string {
return "noopdatabase"
}
func (n noOpDatabase) FindAllNamespaces(ctx context.Context) ([]string, error) {
return nil, errNoDatabase
}
func (n noOpDatabase) FindQueriesForNamespace(ctx context.Context, namespace string, archived bool) ([]restql.SavedQuery, error) {
return nil, errNoDatabase
}
func (n noOpDatabase) FindQueryWithAllRevisions(ctx context.Context, namespace string, queryName string, archived bool) (restql.SavedQuery, error) {
return restql.SavedQuery{}, errNoDatabase
}
func (n noOpDatabase) CreateQueryRevision(ctx context.Context, namespace string, queryName string, content string) error {
return errNoDatabase
}
func (n noOpDatabase) FindAllTenants(ctx context.Context) ([]string, error) {
return nil, errNoDatabase
}
func (n noOpDatabase) CreateMapping(ctx context.Context, tenantID string, mappingsName string, url string) error {
return errNoDatabase
}
func (n noOpDatabase) SetMapping(ctx context.Context, tenantID string, mappingsName string, url string) error {
return errNoDatabase
}
func (n noOpDatabase) FindMappingsForTenant(ctx context.Context, tenantID string) ([]restql.Mapping, error) {
return nil, errNoDatabase
}
func (n noOpDatabase) FindQuery(ctx context.Context, namespace string, name string, revision int) (restql.SavedQueryRevision, error) {
return restql.SavedQueryRevision{}, errNoDatabase
}