generated from TBD54566975/tbd-project-template
/
schema.go
145 lines (125 loc) 路 3.31 KB
/
schema.go
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package schema
import (
"crypto/sha256"
"fmt"
"reflect"
"strings"
"github.com/alecthomas/types/optional"
"google.golang.org/protobuf/proto"
schemapb "github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/schema"
)
type Schema struct {
Pos Position `parser:"" protobuf:"1,optional"`
Modules []*Module `parser:"@@*" protobuf:"2"`
}
var _ Node = (*Schema)(nil)
func (s *Schema) Position() Position { return s.Pos }
func (s *Schema) String() string {
out := &strings.Builder{}
for i, m := range s.Modules {
if i != 0 {
fmt.Fprintln(out)
}
fmt.Fprint(out, m)
}
return out.String()
}
func (s *Schema) schemaChildren() []Node {
out := make([]Node, len(s.Modules))
for i, m := range s.Modules {
out[i] = m
}
return out
}
func (s *Schema) Hash() [sha256.Size]byte {
return sha256.Sum256([]byte(s.String()))
}
func (s *Schema) ResolveRefMonomorphised(ref *Ref) (*Data, error) {
out := &Data{}
err := s.ResolveRefToType(ref, out)
if err != nil {
return nil, err
}
return out.Monomorphise(ref)
}
func (s *Schema) ResolveRef(ref *Ref) Decl {
for _, module := range s.Modules {
if module.Name == ref.Module {
for _, decl := range module.Decls {
if decl.GetName() == ref.Name {
return decl
}
}
}
}
return nil
}
func (s *Schema) ResolveRefToType(ref *Ref, out Decl) error {
if reflect.ValueOf(out).Kind() != reflect.Ptr {
return fmt.Errorf("out parameter is not a pointer")
}
if reflect.ValueOf(out).Elem().Kind() == reflect.Invalid {
return fmt.Errorf("out parameter is a nil pointer")
}
for _, module := range s.Modules {
if module.Name == ref.Module {
for _, decl := range module.Decls {
if decl.GetName() == ref.Name {
declType := reflect.TypeOf(decl)
outType := reflect.TypeOf(out)
if declType.Elem().AssignableTo(outType.Elem()) {
reflect.ValueOf(out).Elem().Set(reflect.ValueOf(decl).Elem())
return nil
}
return fmt.Errorf("resolved declaration is not of the expected type: want %s, got %s",
outType, declType)
}
}
}
}
return fmt.Errorf("could not resolve reference %v", ref)
}
// Module returns the named module if it exists.
func (s *Schema) Module(name string) optional.Option[*Module] {
for _, module := range s.Modules {
if module.Name == name {
return optional.Some(module)
}
}
return optional.None[*Module]()
}
// Upsert inserts or replaces a module.
func (s *Schema) Upsert(module *Module) {
for i, m := range s.Modules {
if m.Name == module.Name {
s.Modules[i] = module
return
}
}
s.Modules = append(s.Modules, module)
}
func (s *Schema) ToProto() proto.Message {
return &schemapb.Schema{
Pos: posToProto(s.Pos),
Modules: nodeListToProto[*schemapb.Module](s.Modules),
}
}
func TypeName(v any) string {
t := reflect.Indirect(reflect.ValueOf(v)).Type()
// handle AbstractRefs like "AbstractRef[github.com/TBD54566975/ftl/backend/protos/xyz/block/ftl/v1/schema.DataRef]"
if strings.HasPrefix(t.Name(), "AbstractRef[") {
return strings.TrimSuffix(strings.Split(t.Name(), ".")[2], "]")
}
return t.Name()
}
// FromProto converts a protobuf Schema to a Schema and validates it.
func FromProto(s *schemapb.Schema) (*Schema, error) {
modules, err := moduleListToSchema(s.Modules)
if err != nil {
return nil, err
}
schema := &Schema{
Modules: modules,
}
return ValidateSchema(schema)
}