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Hyperledger Fabric getHistory Golang
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func (t *SimpleChaincode) getHistoryForMarble(stub shim.ChaincodeStubInterface, args []string) sc.Response { | |
if len(args) < 1 { | |
return shim.Error("Incorrect number of arguments. Expecting 1") | |
} | |
marbleName := args[0] | |
fmt.Printf("- start getHistoryForMarble: %s\n", marbleName) | |
resultsIterator, err := stub.GetHistoryForKey(marbleName) | |
if err != nil { | |
return shim.Error(err.Error()) | |
} | |
defer resultsIterator.Close() | |
// buffer is a JSON array containing historic values for the marble | |
var buffer bytes.Buffer | |
buffer.WriteString("[") | |
bArrayMemberAlreadyWritten := false | |
for resultsIterator.HasNext() { | |
response, err := resultsIterator.Next() | |
if err != nil { | |
return shim.Error(err.Error()) | |
} | |
// Add a comma before array members, suppress it for the first array member | |
if bArrayMemberAlreadyWritten == true { | |
buffer.WriteString(",") | |
} | |
buffer.WriteString("{\"TxId\":") | |
buffer.WriteString("\"") | |
buffer.WriteString(response.TxId) | |
buffer.WriteString("\"") | |
buffer.WriteString(", \"Value\":") | |
// if it was a delete operation on given key, then we need to set the | |
//corresponding value null. Else, we will write the response.Value | |
//as-is (as the Value itself a JSON marble) | |
if response.IsDelete { | |
buffer.WriteString("null") | |
} else { | |
buffer.WriteString(string(response.Value)) | |
} | |
buffer.WriteString(", \"Timestamp\":") | |
buffer.WriteString("\"") | |
buffer.WriteString(time.Unix(response.Timestamp.Seconds, int64(response.Timestamp.Nanos)).String()) | |
buffer.WriteString("\"") | |
buffer.WriteString(", \"IsDelete\":") | |
buffer.WriteString("\"") | |
buffer.WriteString(strconv.FormatBool(response.IsDelete)) | |
buffer.WriteString("\"") | |
buffer.WriteString("}") | |
bArrayMemberAlreadyWritten = true | |
} | |
buffer.WriteString("]") | |
fmt.Printf("- getHistoryForMarble returning:\n%s\n", buffer.String()) | |
return shim.Success(buffer.Bytes()) | |
} |
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