// handleProperty retrieves or deletes properties that can be added to a vertex or edge -- data posted
// or retrieved uses default compression
func (d *Data) handleProperty(ctx *datastore.VersionedCtx, db storage.GraphDB, w http.ResponseWriter, r *http.Request, path []string, method string) error {
edgemode := false
var propertyname string
if len(path) == 3 {
edgemode = true
propertyname = path[2]
} else if len(path) != 2 {
return fmt.Errorf("Incorrect number of parameters specified for handling properties")
} else {
propertyname = path[1]
}
temp, err := strconv.Atoi(path[0])
if err != nil {
return fmt.Errorf("Vertex number not provided")
}
id1 := dvid.VertexID(temp)
id2 := dvid.VertexID(0)
if edgemode {
temp, err := strconv.Atoi(path[1])
if err != nil {
return fmt.Errorf("Vertex number not provided")
}
id2 = dvid.VertexID(temp)
}
// remove a property from a vertex or edge
if method == "delete" {
if edgemode {
db.RemoveEdgeProperty(ctx, id1, id2, propertyname)
if err != nil {
return fmt.Errorf("Failed to remove edge property %d-%d %s: %v\n", id1, id2, propertyname, err)
}
} else {
db.RemoveVertexProperty(ctx, id1, propertyname)
if err != nil {
return fmt.Errorf("Failed to remove vertex property %d %s: %v\n", id1, propertyname, err)
}
}
} else if method == "get" {
var data []byte
if edgemode {
data, err = db.GetEdgeProperty(ctx, id1, id2, propertyname)
} else {
data, err = db.GetVertexProperty(ctx, id1, propertyname)
}
if err != nil {
return fmt.Errorf("Failed to get property %s: %v\n", propertyname, err)
}
uncompress := true
value, _, e := dvid.DeserializeData(data, uncompress)
if e != nil {
err = fmt.Errorf("Unable to deserialize data for property '%s': %v\n", propertyname, e.Error())
return err
}
w.Header().Set("Content-Type", "application/octet-stream")
_, err = w.Write(value)
if err != nil {
return err
}
} else if method == "post" {
// read as binary and load into propertyname
data, err := ioutil.ReadAll(r.Body)
if err != nil {
return err
}
serialization, err := dvid.SerializeData(data, d.Compression(), d.Checksum())
if err != nil {
return fmt.Errorf("Unable to serialize data: %v\n", err)
}
if edgemode {
err = db.SetEdgeProperty(ctx, id1, id2, propertyname, serialization)
} else {
err = db.SetVertexProperty(ctx, id1, propertyname, serialization)
}
if err != nil {
return fmt.Errorf("Failed to add property %s: %v\n", propertyname, err)
}
}
return err
}
// handelPropertyTransaction allows gets/posts (really puts) of edge or vertex properties.
func (d *Data) handlePropertyTransaction(ctx *datastore.VersionedCtx, db storage.GraphDB, w http.ResponseWriter, r *http.Request, path []string, method string) error {
if len(path) < 2 {
return fmt.Errorf("Must specify edges or vertices in URI and property name")
}
if method == "delete" {
return fmt.Errorf("Transactional delete not supported")
}
edgemode := false
if path[0] == "edges" {
edgemode = true
} else if path[0] != "vertices" {
return fmt.Errorf("Must specify edges or vertices in URI")
}
propertyname := path[1]
readonly := false
if method == "get" {
readonly = true
}
data, err := ioutil.ReadAll(r.Body)
// only allow 1000 vertices to be locked
transactions, start, err := d.transaction_log.createTransactionGroupBinary(data, readonly)
defer transactions.closeTransaction()
if err != nil {
return fmt.Errorf("Failed to create property transaction: %v", err)
}
returned_data := transactions.exportTransactionsBinary()
if method == "post" {
// deserialize transaction (vertex or edge) -- use URI?
num_properties := binary.LittleEndian.Uint64(data[start:])
start += 8
for i := uint64(0); i < num_properties; i++ {
temp := binary.LittleEndian.Uint64(data[start:])
id := dvid.VertexID(temp)
var id2 dvid.VertexID
start += 8
if edgemode {
temp = binary.LittleEndian.Uint64(data[start:])
id2 = dvid.VertexID(temp)
start += 8
}
data_size := binary.LittleEndian.Uint64(data[start:])
start += 8
data_begin := start
start += int(data_size)
data_end := start
if data_begin == data_end {
continue
}
// check if post is possible
if _, ok := transactions.locked_ids[id]; !ok {
continue
}
if edgemode {
if _, ok := transactions.locked_ids[id2]; !ok {
continue
}
}
// execute post
serialization, err := dvid.SerializeData(data[data_begin:data_end], d.Compression(), d.Checksum())
if err != nil {
return fmt.Errorf("Unable to serialize data: %v\n", err)
}
if edgemode {
err = db.SetEdgeProperty(ctx, id, id2, propertyname, serialization)
} else {
err = db.SetVertexProperty(ctx, id, propertyname, serialization)
}
if err != nil {
return fmt.Errorf("Failed to add property %s: %v\n", propertyname, err)
}
}
} else {
num_properties := binary.LittleEndian.Uint64(data[start:])
start += 8
num_properties_loc := len(returned_data)
longbuf := make([]byte, 8, 8)
binary.LittleEndian.PutUint64(longbuf, 0)
returned_data = append(returned_data, longbuf...)
num_executed_transactions := uint64(0)
// read the vertex or edge properties desired
for i := uint64(0); i < num_properties; i++ {
temp := binary.LittleEndian.Uint64(data[start:])
id := dvid.VertexID(temp)
var id2 dvid.VertexID
start += 8
if edgemode {
temp := binary.LittleEndian.Uint64(data[start:])
id2 = dvid.VertexID(temp)
start += 8
}
// check if post is possible
if _, ok := transactions.locked_ids[id]; !ok {
continue
}
if edgemode {
if _, ok := transactions.locked_ids[id2]; !ok {
continue
}
}
// execute get command
var dataout []byte
if edgemode {
dataout, err = db.GetEdgeProperty(ctx, id, id2, propertyname)
} else {
dataout, err = db.GetVertexProperty(ctx, id, propertyname)
}
// serialize return data only if there is return data and no error;
// otherwise return just return the id and size of 0
var data_serialized []byte
if (err == nil) && len(dataout) > 0 {
uncompress := true
data_serialized, _, err = dvid.DeserializeData(dataout, uncompress)
if err != nil {
return fmt.Errorf("Unable to deserialize data for property '%s': %v\n", propertyname, err)
}
}
// save transaction
num_executed_transactions += 1
binary.LittleEndian.PutUint64(longbuf, uint64(id))
returned_data = append(returned_data, longbuf...)
if edgemode {
binary.LittleEndian.PutUint64(longbuf, uint64(id2))
returned_data = append(returned_data, longbuf...)
}
binary.LittleEndian.PutUint64(longbuf, uint64(len(data_serialized)))
returned_data = append(returned_data, longbuf...)
returned_data = append(returned_data, data_serialized...)
}
// update the number of transactions
binary.LittleEndian.PutUint64(returned_data[num_properties_loc:], num_executed_transactions)
}
w.Header().Set("Content-Type", "application/octet-stream")
_, err = w.Write(returned_data)
return err
}