I'm trying to use a ticker in my chaincode to update the chaincode state periodically, based on some condition:
func (t *SimpleChaincode) Invoke(stub *shim.ChaincodeStub, function string, args []string) ([]byte, error) {
ticker := time.NewTicker(time.Millisecond * 10000)
go func() {
for t := range ticker.C {
fmt.Println("Tick at", t)
a = a+5
err:= stub.PutState("a", []byte(strconv.Itoa(a)))
fmt.Println(err.Error())
}
}()
return nil, nil
I am sending the invoke transaction using the chaincode REST API for invoke :
POST http://<ip>:<port>/chaincode
{
"jsonrpc": "2.0",
"method": "invoke",
"params": {
"type": 1,
"chaincodeID":{
"name":"c7b3c82f1170423115dcfc2524189f96f156b30961e0a0e84426c425c22f3b4e8b6ecbf477b76e014bfce74b996dee476a2470cbddc14d390617192f00c22c38"
},
"ctorMsg": {
"function":"invoke",
"args":[]
},
"secureContext": "tom"
},
"id": 1
}
But PutState is failing with the following log:
2016/05/20 13:44:04 [8bcbe40e]Inside putstate, isTransaction = false
Tick at 2016-05-20 13:44:04.609079034 +0000 UTC
Cannot put state in query context
Tick at 2016-05-20 13:44:14.609093012 +0000 UTC
Cannot put state in query context
2016/05/20 13:44:14 [8bcbe40e]Inside putstate, isTransaction = false
Tick at 2016-05-20 13:44:24.609070317 +0000 UTC
Cannot put state in query context
Why is isTransaction = false, and why does it consider this context as a query context?
Back