github.com/GeniusesGroup/libgo@v0.0.0-20220929090155-5ff932cb408e/object/service-get-metadata-sdk.go (about)

     1  /* For license and copyright information please see LEGAL file in repository */
     2  
     3  package object
     4  
     5  import (
     6  	"../protocol"
     7  	"../service"
     8  	"../srpc"
     9  	"../syllab"
    10  )
    11  
    12  var GetMetadataService = getMetadataService{
    13  	Service: service.New("urn:giti:object.protocol:service:get-metadata", "", protocol.ServiceStatePreAlpha, 1587282740).
    14  		SetDetail(protocol.LanguageEnglish, "Get Metadata",
    15  			`use to get an object by the objectID and structureID! It must send to proper node otherwise get not found error!`,
    16  			[]string{}).
    17  		SetAuthorization(protocol.CRUDRead, protocol.UserTypeApp).Expired(0, ""),
    18  }
    19  
    20  type getMetadataService struct {
    21  	service.Service
    22  }
    23  
    24  func (ser *getMetadataService) DoSRPC(req GetMetadataRequest) (res protocol.ObjectMetadata, err protocol.Error) {
    25  	var node protocol.ApplicationNode
    26  	node, err = protocol.App.GetNodeByObjectID(req.objectID)
    27  	if err != nil {
    28  		return
    29  	}
    30  
    31  	if node.Status() == protocol.ApplicationStateLocalNode {
    32  		return getMetadata(&req)
    33  	}
    34  
    35  	var srpcRes srpc.Response
    36  	srpcRes, err = srpc.HandleOutcomeRequest(node.Conn(), ser, &req)
    37  	if err != nil {
    38  		return
    39  	}
    40  	res = Metadata(syllab.GetByteArray(srpcRes.Payload(), 0))
    41  	return
    42  }
    43  
    44  /*
    45  	Service request and response shape
    46  */
    47  
    48  type getMetadataRequest interface {
    49  	ObjectID() [32]byte
    50  	ObjectStructureID() uint64
    51  }
    52  
    53  /*
    54  	Service Request
    55  */
    56  
    57  // GetMetadataRequest is request structure of Object()
    58  type GetMetadataRequest struct {
    59  	objectID          [32]byte
    60  	objectStructureID uint64
    61  }
    62  
    63  // methods to implements getRequest interface
    64  func (req *GetMetadataRequest) ObjectID() [32]byte        { return req.objectID }
    65  func (req *GetMetadataRequest) ObjectStructureID() uint64 { return req.objectStructureID }
    66  
    67  // methods to implements protocol.Syllab interface
    68  func (req *GetMetadataRequest) CheckSyllab(payload []byte) (err protocol.Error) {
    69  	if len(payload) < int(req.LenOfSyllabStack()) {
    70  		err = syllab.ErrShortArrayDecode
    71  	}
    72  	return
    73  }
    74  func (req *GetMetadataRequest) FromSyllab(payload []byte, stackIndex uint32) {
    75  	copy(req.objectID[:], payload[:])
    76  }
    77  func (req *GetMetadataRequest) ToSyllab(payload []byte, stackIndex, heapIndex uint32) (freeHeapIndex uint32) {
    78  	copy(payload[4:], req.objectID[:])
    79  	syllab.SetUInt64(payload, 36, req.objectStructureID)
    80  	return heapIndex
    81  }
    82  func (req *GetMetadataRequest) LenAsSyllab() uint64          { return 40 }
    83  func (req *GetMetadataRequest) LenOfSyllabStack() uint32     { return 40 }
    84  func (req *GetMetadataRequest) LenOfSyllabHeap() (ln uint32) { return }