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server.go
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server.go
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package bigstruct
import (
"context"
"errors"
"fmt"
"github.com/rjeczalik/bigstruct/big"
"github.com/rjeczalik/bigstruct/big/codec"
"github.com/rjeczalik/bigstruct/internal/bigstruct"
"github.com/rjeczalik/bigstruct/storage"
"github.com/rjeczalik/bigstruct/storage/model"
"gorm.io/gorm"
)
var (
structOnly = func(tx storage.Gorm) storage.Gorm { return tx.WithDB(tx.DB.Where("`type` = ?", "struct")) }
)
type Transport interface {
Do(context.Context, ...*Op) error
}
type Func func(context.Context, ...*Op) error
func (fn Func) Do(ctx context.Context, ops ...*Op) error { return fn(ctx, ops...) }
type Server struct {
Storage *storage.Gorm
Codec big.Codec
}
func (s *Server) Do(ctx context.Context, ops ...*Op) error {
return s.Storage.Transaction(s.txDo(ctx, ops...))
}
func (s *Server) txDo(ctx context.Context, ops ...*Op) storage.Func {
return func(tx storage.Gorm) (err error) {
for _, op := range ops {
switch op.Type {
case "LIST":
err = s.txDoList(ctx, op)(tx)
case "GET":
err = s.txDoGet(ctx, op)(tx)
case "SET":
err = s.txDoSet(ctx, op)(tx)
case "DEBUG":
err = s.txDoDebug(ctx, op)(tx)
default:
err = fmt.Errorf("unsupported op type: %q", op.Type)
}
if err != nil {
return err
}
}
return nil
}
}
func (s *Server) doList(ctx context.Context, op *Op) error {
return s.Storage.Transaction(s.txDoList(ctx, op))
}
func (s *Server) txDoList(ctx context.Context, op *Op) storage.Func {
var (
prefixes = op.Struct.Fields().Keys()
)
if len(prefixes) == 0 {
prefixes = append(prefixes, big.Prefix)
}
return func(tx storage.Gorm) error {
var (
obj bigstruct.Object
)
if err := s.txObject(ctx, op, &obj)(tx); err != nil {
return fmt.Errorf("error building object: %w", err)
}
tx = tx.WithScopes(structOnly)
for _, prefix := range prefixes {
if err := obj.LoadSchema(tx, prefix); err != nil {
return fmt.Errorf("error loading schema for %q prefix: %w", prefix, err)
}
}
op.Struct = obj.Schemas().Fields().Struct()
return nil
}
}
func (s *Server) doGet(ctx context.Context, op *Op) error {
return s.Storage.Transaction(s.txDoGet(ctx, op))
}
func (s *Server) txDoGet(ctx context.Context, op *Op) storage.Func {
var (
keys = op.Struct.Fields().Keys()
)
if len(keys) == 0 {
keys = append(keys, big.Prefix)
}
return func(tx storage.Gorm) (err error) {
var obj bigstruct.Object
if err = s.txObject(ctx, op, &obj)(tx); err != nil {
return fmt.Errorf("error building object: %w", err)
}
for _, key := range keys {
if err = obj.LoadSchema(tx, key); err != nil {
return fmt.Errorf("error loading schema for %q key: %w", key, err)
}
if err = obj.LoadValue(tx, key); err != nil {
return fmt.Errorf("error loading values for %q key: %w", key, err)
}
}
if err := obj.Encode(ctx, codec.DefaultTemplate); err != nil {
return fmt.Errorf("error templating object: %w", err)
}
op.Struct = obj.Struct()
if op.Encode {
if err = op.Struct.Encode(ctx, s.codec()); err != nil {
return fmt.Errorf("error encoding struct: %w", err)
}
}
return nil
}
}
func (s *Server) doSet(ctx context.Context, op *Op) error {
return s.Storage.Transaction(s.txDoSet(ctx, op))
}
func (s *Server) txDoSet(ctx context.Context, op *Op) storage.Func {
return func(tx storage.Gorm) (err error) {
var obj bigstruct.Object
if err = s.txObject(ctx, op, &obj)(tx); err != nil {
return fmt.Errorf("error building object: %w", err)
}
if obj.Overlay == nil {
return errors.New("overlay is missing")
}
// todo: load only schema=true and schema for obj.Overlay
if err = obj.LoadSchema(tx, big.Prefix); err != nil {
return fmt.Errorf("error loading schema: %w", err)
}
scope, err := obj.Build(ctx, op.Struct, s.codec())
if err != nil {
return fmt.Errorf("error building object: %w", err)
}
if err := tx.UpsertSchemas(scope.Schema); err != nil {
return fmt.Errorf("error upserting schema: %w", err)
}
if err := tx.UpsertValues(scope.Value); err != nil {
return fmt.Errorf("error upserting values: %w", err)
}
return nil
}
}
func (s *Server) doDebug(ctx context.Context, op *Op) error {
return s.Storage.Transaction(s.txDoDebug(ctx, op))
}
func (s *Server) txDoDebug(ctx context.Context, op *Op) storage.Func {
var (
keys = op.Struct.Fields().Keys()
)
if len(keys) == 0 {
keys = append(keys, big.Prefix)
}
return func(tx storage.Gorm) (err error) {
var obj bigstruct.Object
if err = s.txObject(ctx, op, &obj)(tx); err != nil {
return fmt.Errorf("error building object: %w", err)
}
for _, key := range keys {
if err = obj.LoadSchema(tx, key); err != nil {
return fmt.Errorf("error loading schema for %q key: %w", key, err)
}
if err = obj.LoadValue(tx, key); err != nil {
return fmt.Errorf("error loading values for %q key: %w", key, err)
}
}
op.Struct = nil
op.Debug.Schemas = obj.Schemas()
op.Debug.Values = obj.Values()
return nil
}
}
func (s *Server) object(ctx context.Context, op *Op) (*bigstruct.Object, error) {
var obj bigstruct.Object
return &obj, s.Storage.Transaction(s.txObject(ctx, op, &obj))
}
func (s *Server) txObject(ctx context.Context, op *Op, out *bigstruct.Object) storage.Func {
return func(tx storage.Gorm) (err error) {
obj := bigstruct.Object{
Index: op.Index,
Overlay: op.Overlay,
}
if op.Overlay != nil {
obj.Overlay, err = tx.Overlay(op.Overlay.Ref())
if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
return fmt.Errorf("error loading %q overlay: %w", op.Overlay.Ref(), err)
}
}
ns, err := s.buildOverlays(ctx, tx, &obj)
if err != nil {
return fmt.Errorf("error building overlays: %w", err)
}
for _, n := range ns {
obj.Scopes = append(obj.Scopes, bigstruct.Scope{
Overlay: n,
})
}
*out = obj
return nil
}
}
func (s *Server) buildOverlays(ctx context.Context, tx storage.Gorm, obj *bigstruct.Object) (model.Overlays, error) {
ns, err := tx.ListOverlays()
if err != nil {
return nil, err
}
n, err := s.indexOverlays(ctx, tx, ns, obj)
if err != nil {
return nil, err
}
return ns[:n], nil
}
func (s *Server) indexOverlays(ctx context.Context, tx storage.Gorm, ns model.Overlays, obj *bigstruct.Object) (int, error) {
var (
m = obj.Index.Index.Map()
n = len(ns)
)
if len(m) == 0 {
err := tx.DB.Where("`name` = ? AND `property` = ?", obj.Index.Name, obj.Index.Property).First(obj.Index).Error
if err != nil {
return 0, fmt.Errorf("error looking up static index for %q: %w", obj.Index.Ref(), err)
}
m = obj.Index.Index.Map()
}
for i, ns := range ns {
var prop string
if v, ok := m[ns.Name]; ok && v != "" {
prop = fmt.Sprint(v)
}
if err := ns.SetProperty(prop); err != nil {
return 0, fmt.Errorf(
"unable to set property %v for overlay %q indexed via %q: %w",
prop, ns.Name, obj.Index.Ref(), err,
)
}
if obj.Overlay != nil && obj.Overlay.Name == ns.Name {
n = i + 1
break
}
}
return n, nil
}
func (s *Server) codec() big.Codec {
if s.Codec != nil {
return s.Codec
}
return codec.Default
}