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/*
* SPDX-FileCopyrightText: © Hypermode Inc. <hello@hypermode.com>
* SPDX-License-Identifier: Apache-2.0
*/
package modusgraph
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"reflect"
"strings"
dg "github.com/dolan-in/dgman/v2"
)
// checkObject validates the passed obj. If it's a slice or a pointer
// to a slice, it returns the first element of the slice. Ultimately,
// the object discovered must be pointer.
func checkObject(obj any) (any, error) {
val := reflect.ValueOf(obj)
validateSlice := func(val reflect.Value) (interface{}, error) {
if val.Len() == 0 {
return nil, errors.New("slice cannot be empty")
}
firstElem := val.Index(0)
if firstElem.Kind() != reflect.Ptr {
return nil, errors.New("slice elements must be pointers")
}
return firstElem.Interface(), nil
}
if val.Kind() == reflect.Ptr && val.Elem().Kind() == reflect.Slice {
return validateSlice(val.Elem())
}
if val.Kind() == reflect.Slice {
return validateSlice(val)
}
if val.Kind() != reflect.Ptr {
return obj, errors.New("object must be a pointer")
}
return obj, nil
}
func (c client) process(ctx context.Context,
obj any, operation string,
txFunc func(*dg.TxnContext, any) ([]string, error)) error {
schemaObj, err := checkObject(obj)
if err != nil {
return err
}
if c.options.autoSchema {
err := c.UpdateSchema(ctx, schemaObj)
if err != nil {
return err
}
}
client, err := c.pool.get()
if err != nil {
c.logger.Error(err, "Failed to get client from pool")
return err
}
defer c.pool.put(client)
tx := dg.NewTxnContext(ctx, client).SetCommitNow()
uids, err := txFunc(tx, obj)
if err != nil {
return err
}
c.logger.V(2).Info(operation+" successful", "uidCount", len(uids))
return nil
}
func (c client) mutateWithUniqueVerification(ctx context.Context, obj any, insert bool) error {
schemaObj, err := checkObject(obj)
if err != nil {
return err
}
if c.options.autoSchema {
if err := c.UpdateSchema(ctx, schemaObj); err != nil {
return err
}
}
// Get the value and prepare for unified slice processing
val := reflect.ValueOf(obj)
var sliceValue reflect.Value
// Handle pointer to slice
if val.Kind() == reflect.Ptr && val.Elem().Kind() == reflect.Slice {
sliceValue = val.Elem()
} else if val.Kind() == reflect.Slice {
// Direct slice
sliceValue = val
} else {
// Single object - create a slice with one element
valElem := val
for valElem.Kind() == reflect.Ptr {
valElem = valElem.Elem()
}
sliceType := reflect.SliceOf(valElem.Type())
sliceValue = reflect.MakeSlice(sliceType, 1, 1)
sliceValue.Index(0).Set(valElem)
}
seen := make(map[string]int)
for i := 0; i < sliceValue.Len(); i++ {
elem := sliceValue.Index(i).Interface()
preds := getUniquePredicates(elem)
if len(preds) == 0 {
continue
}
// In-memory duplicate check
sig := ""
for k, v := range preds {
sig += fmt.Sprintf("%s=%v;", k, v)
}
if prev, ok := seen[sig]; ok {
return fmt.Errorf("duplicate unique predicates in slice at indices %d and %d", prev, i)
}
seen[sig] = i
// Persistent uniqueness check
nodeType := getNodeType(elem)
query, vars := generateUniquePredicateQuery(preds, nodeType)
resp, err := c.QueryRaw(ctx, query, vars)
if err != nil {
return err
}
uid, err := extractUIDFromDgraphQueryResult(resp)
if err != nil {
return err
}
if uid != "" && (insert || uid != getUIDValue(elem)) {
return &dg.UniqueError{NodeType: nodeType, UID: uid}
}
}
client, err := c.pool.get()
if err != nil {
c.logger.Error(err, "Failed to get client from pool")
return err
}
defer c.pool.put(client)
tx := dg.NewTxnContext(ctx, client).SetCommitNow()
uids, err := tx.MutateBasic(obj)
if err != nil {
return err
}
c.logger.V(2).Info("mutation successful", "uidCount", len(uids))
return nil
}
func (c client) upsert(ctx context.Context, obj any, upsertPredicate string) error {
schemaObj, err := checkObject(obj)
if err != nil {
return err
}
// users can pass slices, so check for that
val := reflect.ValueOf(obj)
var sliceValue reflect.Value
// Handle pointer to slice
if val.Kind() == reflect.Ptr && val.Elem().Kind() == reflect.Slice {
sliceValue = val.Elem()
} else if val.Kind() == reflect.Slice {
// Direct slice
sliceValue = val
}
if sliceValue.IsValid() && sliceValue.Len() > 0 {
for i := 0; i < sliceValue.Len(); i++ {
elem := sliceValue.Index(i).Interface()
err := c.upsert(ctx, elem, upsertPredicate)
if err != nil {
return err
}
}
return nil
} else {
if c.options.autoSchema {
err := c.UpdateSchema(ctx, schemaObj)
if err != nil {
return err
}
}
}
upsertPredicates := getUpsertPredicates(schemaObj, upsertPredicate == "")
if len(upsertPredicates) == 0 {
return errors.New("no upsert predicates found")
}
var firstPredicate string
for k := range upsertPredicates {
firstPredicate = k
break
}
if len(upsertPredicates) > 1 {
c.logger.V(1).Info("Multiple upsert predicates found, using first", "predicate", firstPredicate)
}
if upsertPredicate == "" {
upsertPredicate = firstPredicate
} else {
if _, ok := upsertPredicates[upsertPredicate]; !ok {
return fmt.Errorf("upsert predicate %q not found", upsertPredicate)
}
}
query := fmt.Sprintf(`{
q(func: eq(%s, "%s")) {
uid
}
}`, upsertPredicate, upsertPredicates[upsertPredicate])
resp, err := c.QueryRaw(ctx, query, nil)
if err != nil {
return err
}
uid, err := extractUIDFromDgraphQueryResult(resp)
if err != nil {
return err
}
if uid == "" {
return c.Insert(ctx, obj)
}
objValue := reflect.ValueOf(schemaObj)
objValue.Elem().FieldByName("UID").SetString(uid)
return c.Update(ctx, objValue.Interface())
}
func generateUniquePredicateQuery(predicates map[string]interface{}, nodeType string) (string, map[string]string) {
var queryBuf bytes.Buffer
vars := make(map[string]string)
// Build variable declarations and OR conditions
varDecls := make([]string, 0, len(predicates))
conditions := make([]string, 0, len(predicates))
for key, val := range predicates {
varType := "string"
switch val.(type) {
case int, int32, int64, float32, float64:
varType = "int"
}
varDecls = append(varDecls, fmt.Sprintf("$%s: %s", key, varType))
conditions = append(conditions, fmt.Sprintf("eq(%s, $%s)", key, key))
key = fmt.Sprintf("$%s", key)
vars[key] = fmt.Sprintf("%v", val)
}
queryBuf.WriteString("query q(")
queryBuf.WriteString(strings.Join(varDecls, ", "))
queryBuf.WriteString(") {\n")
queryBuf.WriteString(fmt.Sprintf(" q(func: type(%s)) @filter(%s) {\n", nodeType, strings.Join(conditions, " OR ")))
queryBuf.WriteString(" uid\n }\n")
queryBuf.WriteString("}\n")
return queryBuf.String(), vars
}
func getNodeType(obj any) string {
v := reflect.ValueOf(obj)
if v.Kind() == reflect.Ptr {
v = v.Elem()
}
dtypeField := v.FieldByName("DType")
var nodeType string
if dtypeField.IsValid() && dtypeField.Kind() == reflect.Slice && dtypeField.Len() > 0 {
nodeType = dtypeField.Index(0).String()
} else {
nodeType = v.Type().Name() // fallback if DType is not present or empty
}
return nodeType
}
func getUIDValue(obj any) string {
v := reflect.ValueOf(obj)
if v.Kind() == reflect.Ptr {
v = v.Elem()
}
return v.FieldByName("UID").String()
}
func extractUIDFromDgraphQueryResult(resp []byte) (string, error) {
var result map[string]interface{}
if err := json.Unmarshal(resp, &result); err != nil {
return "", err
}
q, ok := result["q"].([]interface{})
if !ok || len(q) == 0 {
return "", nil
}
firstItem, ok := q[0].(map[string]interface{})
if !ok {
return "", fmt.Errorf("invalid structure in 'q' array")
}
uid, ok := firstItem["uid"].(string)
if !ok {
return "", fmt.Errorf("uid not found or not a string")
}
return uid, nil
}
func getUpsertPredicates(obj any, firstOnly bool) map[string]any {
return getPredicatesByTag(obj, "upsert", firstOnly)
}
func getUniquePredicates(obj any) map[string]any {
return getPredicatesByTag(obj, "unique", false)
}
func getPredicatesByTag(obj any, tagName string, firstOnly bool) map[string]any {
result := make(map[string]any)
v := reflect.ValueOf(obj)
if v.Kind() == reflect.Ptr {
v = v.Elem()
}
if v.Kind() != reflect.Struct {
return result
}
t := v.Type()
for i := 0; i < t.NumField(); i++ {
field := t.Field(i)
tag := field.Tag.Get("dgraph")
if tag == "" || !strings.Contains(tag, tagName) {
continue
}
var predName string
if idx := strings.Index(tag, "predicate="); idx != -1 {
// Find the first comma or space after predicate=
endIdx := len(tag)
commaIdx := strings.Index(tag[idx:], ",")
spaceIdx := strings.Index(tag[idx:], " ")
if commaIdx != -1 && (spaceIdx == -1 || commaIdx < spaceIdx) {
endIdx = idx + commaIdx
} else if spaceIdx != -1 {
endIdx = idx + spaceIdx
}
predName = tag[idx+len("predicate=") : endIdx]
} else {
jsonTag := field.Tag.Get("json")
if jsonTag != "" && jsonTag != "-" {
commaIdx := strings.Index(jsonTag, ",")
if commaIdx != -1 {
predName = jsonTag[:commaIdx]
} else {
predName = jsonTag
}
} else {
predName = field.Name
}
}
result[predName] = v.Field(i).Interface()
if firstOnly {
break
}
}
return result
}