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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,178 @@ | ||
| package modusdb | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "reflect" | ||
| "strings" | ||
|
|
||
| "github.com/dgraph-io/dgo/v240/protos/api" | ||
| "github.com/dgraph-io/dgraph/v24/dql" | ||
| "github.com/dgraph-io/dgraph/v24/protos/pb" | ||
| "github.com/dgraph-io/dgraph/v24/query" | ||
| "github.com/dgraph-io/dgraph/v24/worker" | ||
| "github.com/dgraph-io/dgraph/v24/x" | ||
| ) | ||
|
|
||
| type UniqueField interface{ | ||
| uint64 | ConstrainedField | ||
| } | ||
| type ConstrainedField struct { | ||
| key string | ||
| value any | ||
| } | ||
|
|
||
| func getFieldTags(t reflect.Type) (jsonTags map[string]string, reverseEdgeTags map[string]string, err error) { | ||
| jsonTags = make(map[string]string) | ||
| reverseEdgeTags = make(map[string]string) | ||
| for i := 0; i < t.NumField(); i++ { | ||
| field := t.Field(i) | ||
| jsonTag := field.Tag.Get("json") | ||
| if jsonTag == "" { | ||
| return nil, nil, fmt.Errorf("field %s has no json tag", field.Name) | ||
| } | ||
| jsonName := strings.Split(jsonTag, ",")[0] | ||
| jsonTags[field.Name] = jsonName | ||
| reverseEdgeTag := field.Tag.Get("readFrom") | ||
| if reverseEdgeTag != "" { | ||
| typeAndField := strings.Split(reverseEdgeTag, ",") | ||
| if len(typeAndField) != 2 { | ||
| return nil, nil, fmt.Errorf("field %s has invalid readFrom tag, expected format is type=<type>,field=<field>", field.Name) | ||
| } | ||
| t := strings.Split(typeAndField[0], "=")[1] | ||
| f := strings.Split(typeAndField[1], "=")[1] | ||
| reverseEdgeTags[field.Name] = getPredicateName(t, f) | ||
| } | ||
| } | ||
| return jsonTags, reverseEdgeTags, nil | ||
| } | ||
|
|
||
| func getFieldValues(object any, jsonFields map[string]string) map[string]any { | ||
| values := make(map[string]any) | ||
| v := reflect.ValueOf(object).Elem() | ||
| for fieldName, jsonName := range jsonFields { | ||
| fieldValue := v.FieldByName(fieldName) | ||
| values[jsonName] = fieldValue.Interface() | ||
|
|
||
| } | ||
| return values | ||
| } | ||
|
|
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| func getPredicateName(typeName, fieldName string) string { | ||
| return fmt.Sprint(typeName, ".", fieldName) | ||
| } | ||
|
|
||
| func valueToValType(v any) *api.Value { | ||
| switch val := v.(type) { | ||
| case string: | ||
| return &api.Value{Val: &api.Value_StrVal{StrVal: val}} | ||
| case int: | ||
| return &api.Value{Val: &api.Value_IntVal{IntVal: int64(val)}} | ||
| case int64: | ||
| return &api.Value{Val: &api.Value_IntVal{IntVal: val}} | ||
| case uint64: | ||
| return &api.Value{Val: &api.Value_IntVal{IntVal: int64(val)}} | ||
| case bool: | ||
| return &api.Value{Val: &api.Value_BoolVal{BoolVal: val}} | ||
| case float64: | ||
| return &api.Value{Val: &api.Value_DoubleVal{DoubleVal: val}} | ||
| default: | ||
| return &api.Value{Val: &api.Value_DefaultVal{DefaultVal: fmt.Sprint(v)}} | ||
| } | ||
| } | ||
|
|
||
| func Create[T any](ctx context.Context, n *Namespace, object *T) (uint64, *T, error){ | ||
| uids, err := n.db.z.nextUIDs(&pb.Num{Val: uint64(1), Type: pb.Num_UID}) | ||
| if err != nil { | ||
| return 0, object, err | ||
| } | ||
|
|
||
| t := reflect.TypeOf(*object) | ||
| if t.Kind() != reflect.Struct { | ||
| return 0, object, fmt.Errorf("expected struct, got %s", t.Kind()) | ||
| } | ||
|
|
||
| jsonFields, _, err := getFieldTags(t) | ||
| if err != nil { | ||
| return 0, object, err | ||
| } | ||
| values := getFieldValues(object, jsonFields) | ||
|
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||
|
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||
|
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| nquads := make([]*api.NQuad, 0) | ||
| for jsonName, value := range values { | ||
| if jsonName == "uid" { | ||
| continue | ||
| } | ||
| nquad := &api.NQuad{ | ||
| Namespace: n.ID(), | ||
| Subject: fmt.Sprint(uids.StartId), | ||
| Predicate: getPredicateName(t.Name(), jsonName), | ||
| ObjectValue: valueToValType(value), | ||
| } | ||
| nquads = append(nquads, nquad) | ||
| } | ||
|
|
||
| dms := make([]*dql.Mutation, 0) | ||
| dms = append(dms, &dql.Mutation{ | ||
| Set: nquads, | ||
| }) | ||
| edges, err := query.ToDirectedEdges(dms, nil) | ||
| if err != nil { | ||
| return 0, object, err | ||
| } | ||
| ctx = x.AttachNamespace(ctx, n.ID()) | ||
|
|
||
| n.db.mutex.Lock() | ||
| defer n.db.mutex.Unlock() | ||
|
|
||
| if !n.db.isOpen { | ||
| return 0, object, ErrClosedDB | ||
| } | ||
|
|
||
| startTs, err := n.db.z.nextTs() | ||
| if err != nil { | ||
| return 0, object, err | ||
| } | ||
| commitTs, err := n.db.z.nextTs() | ||
| if err != nil { | ||
| return 0, object, err | ||
| } | ||
|
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||
| m := &pb.Mutations{ | ||
| GroupId: 1, | ||
| StartTs: startTs, | ||
| Edges: edges, | ||
| } | ||
| m.Edges, err = query.ExpandEdges(ctx, m) | ||
| if err != nil { | ||
| return 0, object, fmt.Errorf("error expanding edges: %w", err) | ||
| } | ||
|
|
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| for _, edge := range m.Edges { | ||
| worker.InitTablet(edge.Attr) | ||
| } | ||
|
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| p := &pb.Proposal{Mutations: m, StartTs: startTs} | ||
| if err := worker.ApplyMutations(ctx, p); err != nil { | ||
| return 0, object, err | ||
| } | ||
|
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| err = worker.ApplyCommited(ctx, &pb.OracleDelta{ | ||
| Txns: []*pb.TxnStatus{{StartTs: startTs, CommitTs: commitTs}}, | ||
| }) | ||
| if err != nil { | ||
| return 0, object, err | ||
| } | ||
|
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| v := reflect.ValueOf(object).Elem() | ||
|
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| uidField := v.FieldByName("Uid") | ||
|
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| if uidField.IsValid() && uidField.CanSet() && uidField.Kind() == reflect.Uint64 { | ||
| uidField.SetUint(uids.StartId) | ||
| } | ||
|
|
||
| return uids.StartId, object, nil | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| package modusdb_test | ||
|
|
||
| import ( | ||
| "context" | ||
| "testing" | ||
|
|
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| "github.com/stretchr/testify/require" | ||
|
|
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| "github.com/hypermodeinc/modusdb" | ||
| ) | ||
|
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| type User struct{ | ||
| Uid uint64 `json:"uid"` | ||
| Name string `json:"name"` | ||
| Age int `json:"age"` | ||
| } | ||
|
|
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| func TestCreateApi(t *testing.T) { | ||
| db, err := modusdb.New(modusdb.NewDefaultConfig(t.TempDir())) | ||
| require.NoError(t, err) | ||
| defer db.Close() | ||
|
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| db1, err := db.CreateNamespace() | ||
| require.NoError(t, err) | ||
|
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| require.NoError(t, db1.DropData(context.Background())) | ||
|
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| user := &User{ | ||
| Name: "B", | ||
| Age: 20, | ||
| } | ||
|
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| uid, _, err := modusdb.Create(context.Background(), db1, user) | ||
| require.NoError(t, err) | ||
|
|
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| require.Equal(t, "B", user.Name) | ||
| require.Equal(t, uint64(2), uid) | ||
| require.Equal(t, uint64(2), user.Uid) | ||
|
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| query := `{ | ||
| me(func: has(User.name)) { | ||
| uid | ||
| User.name | ||
| User.age | ||
| } | ||
| }` | ||
| resp, err := db1.Query(context.Background(), query) | ||
| require.NoError(t, err) | ||
| require.JSONEq(t, `{"me":[{"uid":"0x2","User.name":"B","User.age":20}]}`, string(resp.GetJson())) | ||
| } | ||
|
|
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| func TestCreateApiWithNonStruct(t *testing.T) { | ||
| db, err := modusdb.New(modusdb.NewDefaultConfig(t.TempDir())) | ||
| require.NoError(t, err) | ||
| defer db.Close() | ||
|
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| db1, err := db.CreateNamespace() | ||
| require.NoError(t, err) | ||
|
|
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| require.NoError(t, db1.DropData(context.Background())) | ||
|
|
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| user := &User{ | ||
| Name: "B", | ||
| Age: 20, | ||
| } | ||
|
|
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| _, _, err = modusdb.Create[*User](context.Background(), db1, &user) | ||
| require.Error(t, err) | ||
| } |
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Learn more about bidirectional Unicode characters