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package backupformat
import (
"errors"
"fmt"
"reflect"
"github.com/hamba/avro/v2"
)
func init() {
avro.DefaultConfig.Register(spiceDBBackupNamespace+"."+schemaV1SchemaName, SchemaV1{})
avro.DefaultConfig.Register(spiceDBBackupNamespace+"."+relationshipV1SchemaName, RelationshipV1{})
}
type RelationshipV1 struct {
ObjectType string `avro:"object_type"`
ObjectID string `avro:"object_id"`
Relation string `avro:"relation"`
SubjectObjectType string `avro:"subject_object_type"`
SubjectObjectID string `avro:"subject_object_id"`
SubjectRelation string `avro:"subject_relation"`
CaveatName string `avro:"caveat_name"`
CaveatContext []byte `avro:"caveat_context"`
}
type SchemaV1 struct {
SchemaText string `avro:"schema_text"`
}
const (
spiceDBBackupNamespace = "com.authzed.spicedb.backup"
relationshipV1SchemaName = "relationship_v1"
schemaV1SchemaName = "schema_v1"
metadataKeyZT = "com.authzed.spicedb.zedtoken.v1"
)
func avroSchemaV1() (string, error) {
relationshipSchema, err := recordSchemaFromAvroStruct(
relationshipV1SchemaName,
spiceDBBackupNamespace,
RelationshipV1{},
)
if err != nil {
return "", fmt.Errorf("unable to create schema: %w", err)
}
schemaSchema, err := recordSchemaFromAvroStruct(
schemaV1SchemaName,
spiceDBBackupNamespace,
SchemaV1{},
)
if err != nil {
return "", fmt.Errorf("unable to create avro SpiceDB schema schema: %w", err)
}
unionSchema, err := avro.NewUnionSchema([]avro.Schema{relationshipSchema, schemaSchema})
if err != nil {
return "", fmt.Errorf("unable to create avro union schema: %w", err)
}
serialized, err := unionSchema.MarshalJSON()
return string(serialized), err
}
func recordSchemaFromAvroStruct(name, namespace string, avroStruct any) (*avro.RecordSchema, error) {
v := reflect.TypeOf(avroStruct)
schemaFields := make([]*avro.Field, 0, v.NumField())
for i := 0; i < v.NumField(); i++ {
f := v.Field(i)
fieldName := f.Tag.Get("avro")
if fieldName == "" {
return nil, fmt.Errorf("field `%s` missing avro struct tag", f.Name)
}
fieldGoType := f.Type
var fieldType avro.Type
switch fieldGoType.Kind() {
case reflect.String:
fieldType = avro.String
case reflect.Slice:
if fieldGoType.Elem().Kind() != reflect.Uint8 {
return nil, errors.New("unable to build schema for slice, only byte slices are supported")
}
fieldType = avro.Bytes
default:
return nil, fmt.Errorf("unsupported struct kind: %s", fieldGoType)
}
schemaField, err := avro.NewField(fieldName, avro.NewPrimitiveSchema(fieldType, nil))
if err != nil {
return nil, fmt.Errorf("unable to create avro schema field: %w", err)
}
schemaFields = append(schemaFields, schemaField)
}
return avro.NewRecordSchema(name, namespace, schemaFields)
}
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