我正在Mac上用GO编写链码程序。以下是代码:
package main
import (
"encoding/json"
"fmt"
"github.com/hyperledger/fabric/core/chaincode/shim"
sc "github.com/hyperledger/fabric/protos/peer"
)
//Init and Invoke
type SmartContract struct {
}
type SomeDocument struct {
DocumentID string `json:"docid"`
CreatorID string `json:"uid"`
DocHolder string `json:"doc_holder"`
Location string `json:"location"`
DocumentType string `json:"doc_type"`
Content string `json:"doc_content"`
}
func (s *SmartContract) Init(APIstub shim.ChaincodeStubInterface) sc.Response {
return shim.Success(nil)
}
func (s *SmartContract) Invoke(APIstub shim.ChaincodeStubInterface) sc.Response {
return shim.Success(nil)
}
func main() {
first_doc := SomeDocument{"1001", "123456789012", "ABCD EFGH", "New Delhi", "School Form", "I want to enroll in this school"}
theJson, _ := json.Marshal(first_doc) //returns JSON encoding of first_stamp
fmt.Printf("%+v\n", string(theJson))
err := shim.Start(new(SmartContract))
if err != nil {
fmt.Printf("Error creating new Smart Document: %s", err)
} else {
fmt.Println("Success")
}
}
由于此行shim.Start(new(SmartContract))显示以下错误:
{"docid":"1001","uid":"123456789012","doc_holder":"ABCD EFGH","location":"New Delhi","doc_type":"School Form","doc_content":"I want to enroll in this school"}
2018-04-10 23:34:41.598 IST [shim] SetupChaincodeLogging -> INFO 001 Chaincode log level not provided; defaulting to: INFO
2018-04-10 23:34:41.598 IST [shim] SetupChaincodeLogging -> INFO 002 Chaincode (build level: ) starting up ...
Error creating new Smart Document: error chaincode id not provided%
我找不到任何解决方案。
是否可以指定struct属性长度的限制?例如,DocumentID的长度应为10。
答案 0 :(得分:1)
在你看the source时,你看到它在做什么
chaincodename := viper.GetString("chaincode.id.name")
if chaincodename == "" {
return errors.New("error chaincode id not provided")
}
我相信你可以做到:
os.Setenv("chaincode.id.name", "whatever")
或
chaincode.id.name=whatever go run main.go
过去那个。
至于指定属性的长度,当然可以。您要么使用具有长度的数据结构(例如[10]byte
),要么将该字段设为私有并验证setter方法中的长度。
https://play.golang.org/p/WvG-ZWKhrZ7
package main
import (
"fmt"
"encoding/json"
)
type SomeDocument struct {
DocumentID [10]byte `json:"docid"`
CreatorID string `json:"uid"`
DocHolder string `json:"doc_holder"`
Location string `json:"location"`
DocumentType string `json:"doc_type"`
Content string `json:"doc_content"`
}
func (s *SomeDocument) SetDocumentID(id string) {
copy(s.DocumentID[:], []byte(id))
}
func (s SomeDocument) MarshalJSON() ([]byte, error) {
tmp := struct {
DocumentID string `json:"docid"`
CreatorID string `json:"uid"`
DocHolder string `json:"doc_holder"`
Location string `json:"location"`
DocumentType string `json:"doc_type"`
Content string `json:"doc_content"`
}{
string(s.DocumentID[:]),
s.CreatorID,
s.DocHolder,
s.Location,
s.DocumentType,
s.Content,
}
return json.Marshal(tmp)
}
func main() {
s := SomeDocument{}
s.SetDocumentID("1234567890abcd")
js, err := json.Marshal(s)
if err != nil {
panic(err)
}
fmt.Println(string(js))
// {"docid":"1234567890","uid":"","doc_holder":"","location":"","doc_type":"","doc_content":""}
}
答案 1 :(得分:1)
看起来您尝试从IDE或本地运行您的链代码,我建议您查阅文档,特别是查看如何Hangup Bot。
在您的情况下,您只缺少一些环境变量:
export CORE_CHAINCODE_LOGLEVEL=debug
export CORE_PEER_ADDRESS=127.0.0.1:7052
export CORE_CHAINCODE_ID_NAME=mycc:0 // <--- name and version of your chaincode
需要在本地执行您的链码。