[英]Hyperledger error when trying to query the state database after installing the chaincode
这只是我的 chaincod package 的摘录,但我使用 function ListDoctorPermissions
来查询 state 数据库,在我的情况下,我的权限是资产:
type Permission struct {
PermissionId string `json:"permissionId"`
DataCategory string `json:"dataCategory"`
PatientId string `json:"patientId"`
DoctorId string `json:"doctorId"`
Right string `json:"right"`
From string `json:"from"`
To string `json:"to"`
}
在部署链代码的过程中,我在最后运行查询以测试链代码,但出现错误:
Error: endorsement failure during query. response: status:500 message:"Error handling success response. Value did not match schema:\n1. return: Invalid type. Expected: array, given: string"
这就是我调用链码的方式:
peer chaincode query -C mychannel -n permissions -c '{"Args":["ListDoctorPermissions", "doctor1"]}'
在运行查询之前,我在 state 数据库中创建了一个权限,其医生 ID 为“doctor1”,因此在数据库 (couchDB) 中找到复合键和条目应该没有问题。
// List all Permissions given to a doctor
func (s *SmartContract) ListDoctorPermissions(ctx contractapi.TransactionContextInterface, doctorId string) ([]byte, error) {
doctorIterator, err := ctx.GetStub().GetStateByPartialCompositeKey("permissionId", []string{doctorId})
if err != nil {
return nil, err
}
fmt.Printf("the doctor Iterator is: %s", doctorIterator)
defer doctorIterator.Close()
var dataCategory string
var patientId string
var permissionId string
var permissions []byte
bArrayPermissionAlreadyWritten := false
for doctorIterator.HasNext() {
responseRange, err := doctorIterator.Next()
if err != nil {
return nil, err
}
objectType, compositeKeyParts, err := ctx.GetStub().SplitCompositeKey(responseRange.Key)
if err != nil {
return nil, err
}
fmt.Printf("the objectType is: %s", objectType)
dataCategory = compositeKeyParts[1]
patientId = compositeKeyParts[2]
permissionId = doctorId + dataCategory + patientId
fmt.Printf("the compositeKeyParts are: %s", compositeKeyParts[0], compositeKeyParts[1], compositeKeyParts[2])
permissionAsBytes, err := ctx.GetStub().GetState(permissionId)
if err != nil {
return nil, err
}
if bArrayPermissionAlreadyWritten == true {
newBytes := append([]byte(","), permissionAsBytes...)
permissions = append(permissions, newBytes...)
} else {
permissions = append(permissions, permissionAsBytes...)
fmt.Print(permissions)
}
fmt.Printf("Found a asset for index : %s asset id : ", objectType, compositeKeyParts[0], compositeKeyParts[1], compositeKeyParts[2])
bArrayPermissionAlreadyWritten = true
}
permissions = append(permissions, []byte("]")...)
fmt.Print(permissions)
return permissions, nil
}
我已经运行了上面提供的代码,您在评论中是正确的,该问题似乎源于使用[]byte
作为您的返回类型。 我不完全确定为什么会发生这种情况,因为这应该是一个有效的返回类型。 我会进一步研究这个,因为它可能是一个错误。
我能够通过将返回类型转换为string
并返回string(permissions)
来正确返回数据
我注意到在这样做时,您的代码正在构建一个基于 getState 字节的字节数组。 因此,另一种选择是json.Unmarshal
来自 get state 调用的字节到Permission
结构和 append 到一个数组。 然后,您可以将返回类型设为[]Permission
。
我现在建议您采用字符串或权限数组方法,因为我将不得不研究使用[]byte
作为返回类型会发生什么。
// List all Permissions given to a doctor
func (s *SmartContract) ListDoctorPermissions(ctx contractapi.TransactionContextInterface, doctorId string) (string, error) {
doctorIterator, err := ctx.GetStub().GetStateByPartialCompositeKey("permissionId", []string{doctorId})
if err != nil {
return "", err
}
fmt.Printf("the doctor Iterator is: %s", doctorIterator)
defer doctorIterator.Close()
var dataCategory string
var patientId string
var permissionId string
var permissions []byte
bArrayPermissionAlreadyWritten := false
for doctorIterator.HasNext() {
responseRange, err := doctorIterator.Next()
if err != nil {
return "", err
}
objectType, compositeKeyParts, err := ctx.GetStub().SplitCompositeKey(responseRange.Key)
if err != nil {
return "", err
}
fmt.Printf("the objectType is: %s", objectType)
dataCategory = compositeKeyParts[1]
patientId = compositeKeyParts[2]
permissionId = doctorId + dataCategory + patientId
fmt.Printf("the compositeKeyParts are: %s", compositeKeyParts[0], compositeKeyParts[1], compositeKeyParts[2])
permissionAsBytes, err := ctx.GetStub().GetState(permissionId)
if err != nil {
return "", err
}
if bArrayPermissionAlreadyWritten == true {
newBytes := append([]byte(","), permissionAsBytes...)
permissions = append(permissions, newBytes...)
} else {
permissions = append(permissions, permissionAsBytes...)
fmt.Print(permissions)
}
fmt.Printf("Found a asset for index : %s asset id : ", objectType, compositeKeyParts[0], compositeKeyParts[1], compositeKeyParts[2])
bArrayPermissionAlreadyWritten = true
}
permissions = append(permissions, []byte("]")...)
fmt.Print(permissions)
return string(permissions), nil
}
// List all Permissions given to a doctor
func (s *SmartContract) ListDoctorPermissions(ctx contractapi.TransactionContextInterface, doctorId string) ([]Permission, error) {
doctorIterator, err := ctx.GetStub().GetStateByPartialCompositeKey("permissionId", []string{doctorId})
if err != nil {
return nil, err
}
fmt.Printf("the doctor Iterator is: %s", doctorIterator)
defer doctorIterator.Close()
var dataCategory string
var patientId string
var permissionId string
var permissions []Permission
for doctorIterator.HasNext() {
responseRange, err := doctorIterator.Next()
if err != nil {
return nil, err
}
objectType, compositeKeyParts, err := ctx.GetStub().SplitCompositeKey(responseRange.Key)
if err != nil {
return nil, err
}
fmt.Printf("the objectType is: %s", objectType)
dataCategory = compositeKeyParts[1]
patientId = compositeKeyParts[2]
permissionId = doctorId + dataCategory + patientId
fmt.Printf("the compositeKeyParts are: %s", compositeKeyParts[0], compositeKeyParts[1], compositeKeyParts[2])
permissionAsBytes, err := ctx.GetStub().GetState(permissionId)
if err != nil {
return nil, err
}
foundPermission := new(Permission)
err = json.Unmarshal(permissionAsBytes, foundPermission)
if err != nil {
return nil, err
}
permissions = append(permissions, *foundPermission)
}
fmt.Printf("Permissions %v", permissions)
return permissions, nil
}
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