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relationship.go
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relationship.go
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package persistence
import (
"github.com/autom8ter/morpheus/pkg/api"
"github.com/autom8ter/morpheus/pkg/constants"
"github.com/autom8ter/morpheus/pkg/encode"
"github.com/dgraph-io/badger/v3"
"github.com/palantir/stacktrace"
"github.com/spf13/cast"
)
type Relation struct {
relationType string
relationID string
item map[string]interface{}
db *DB
}
func (n *Relation) Type() string {
return n.relationType
}
func (n *Relation) ID() string {
return n.relationID
}
func (n *Relation) Properties() (map[string]interface{}, error) {
if len(n.item) > 0 {
return n.item, nil
}
data := map[string]interface{}{}
if err := n.db.db.View(func(txn *badger.Txn) error {
var key = getRelationPath(n.relationType, n.relationID)
item, err := txn.Get(key)
if err != nil {
return stacktrace.Propagate(err, "failed to get relation properties")
}
if err := item.Value(func(val []byte) error {
return encode.Unmarshal(val, &data)
}); err != nil {
return stacktrace.Propagate(err, "failed to get relation properties")
}
return nil
}); err != nil {
return nil, stacktrace.Propagate(err, "failed to get relation properties")
}
n.item = data
return data, nil
}
func (n *Relation) GetProperty(name string) (interface{}, error) {
all, err := n.Properties()
if err != nil {
return nil, stacktrace.Propagate(err, "")
}
if all == nil {
return nil, stacktrace.Propagate(constants.ErrNotFound, "")
}
return all[name], nil
}
func (n *Relation) SetProperties(properties map[string]interface{}) error {
bits, err := encode.Marshal(properties)
if err != nil {
return stacktrace.Propagate(err, "")
}
var key = getRelationPath(n.relationType, n.relationID)
if err := n.db.db.Update(func(txn *badger.Txn) error {
return txn.Set(key, bits)
}); err != nil {
return stacktrace.Propagate(err, "")
}
n.item = properties
return nil
}
func (n *Relation) DelProperty(name string) error {
all, err := n.Properties()
if err != nil {
return stacktrace.Propagate(err, "")
}
delete(all, name)
if err := n.SetProperties(all); err != nil {
return stacktrace.Propagate(err, "")
}
return nil
}
func (r Relation) Direction() (api.Direction, error) {
all, err := r.Properties()
if err != nil {
return api.Direction(""), stacktrace.Propagate(err, "")
}
if err := r.SetProperties(all); err != nil {
return api.Direction(""), stacktrace.Propagate(err, "")
}
return api.Direction(cast.ToString(all[Internal_Direction])), nil
}
func (r Relation) Relation() (string, error) {
all, err := r.Properties()
if err != nil {
return "", stacktrace.Propagate(err, "")
}
return cast.ToString(all[Internal_Relation]), nil
}
func (r Relation) Source() (api.Node, error) {
all, err := r.Properties()
if err != nil {
return nil, stacktrace.Propagate(err, "failed to load source node")
}
n, err := r.db.GetNode(cast.ToString(all[Internal_SourceType]), cast.ToString(all[Internal_SourceID]))
if err != nil {
return nil, stacktrace.Propagate(err, "")
}
return n, nil
}
func (r Relation) Target() (api.Node, error) {
all, err := r.Properties()
if err != nil {
return nil, stacktrace.Propagate(err, "failed to load target node")
}
n, err := r.db.GetNode(cast.ToString(all[Internal_TargetType]), cast.ToString(all[Internal_TargetID]))
if err != nil {
return nil, stacktrace.Propagate(err, "")
}
return n, nil
}