I'm looking at the tutorial on hyperledger fabric (https://hyperledger-fabric.readthedocs.io/en/latest/test_network.html).
The tutorial mentions command peer chaincode invoke, which accepts
--ctor string Constructor message for the chaincode in JSON format (default "{}")
What's the specification of the JSON message? Is there a documentation available?
I know what JSON is, but what is the format required by the JSON?
The tutorial shows two usages, e.g. -c '{"function":"TransferAsset","Args":["asset6","gqq"]}' and -c '{"Args":["GetAllAssets"]}'
Besides "function" and "Args", can I do something else?
non-empty JSON chaincode parameters must contain the following keys: 'Args' or 'Function' and 'Args'
this are source code
if chaincodeCtorJSON != "{}" {
var f interface{}
err := json.Unmarshal([]byte(chaincodeCtorJSON), &f)
if err != nil {
return errors.Wrap(err, "chaincode argument error")
}
m := f.(map[string]interface{})
sm := make(map[string]interface{})
for k := range m {
sm[strings.ToLower(k)] = m[k]
}
_, argsPresent := sm["args"]
_, funcPresent := sm["function"]
if !argsPresent || (len(m) == 2 && !funcPresent) || len(m) > 2 {
return errors.New("non-empty JSON chaincode parameters must contain the following keys: 'Args' or 'Function' and 'Args'")
}
} else {
if cmd == nil || (cmd != chaincodeInstallCmd && cmd != chaincodePackageCmd) {
return errors.New("empty JSON chaincode parameters must contain the following keys: 'Args' or 'Function' and 'Args'")
}
}
Related
Context: I'm developing a TF Provider.
I'm adding the CustomizeDiff function instead however there's a gotcha: if a resource attribute references another attribute (foo = bar.resourcefoo.xyz), it seems to return "" as value on an initial terraform plan run.
Its signature is
// See Resource documentation.
type CustomizeDiffFunc func(context.Context, *ResourceDiff, interface{}) error
and ResourceDiff doesn't have IsNewResource() that ResourceData has. Are there any workarounds to have something similar to IsNewResource()?
In other words, I want something similar to
func SetDiff(ctx context.Context, diff *schema.ResourceDiff, meta interface{}) error {
if diff.IsNewResource() { return nil }
// Otherwise run the check
...
// If we are increasing "size" then the new value must be
// a multiple of the old value.
if new.(int) <= old.(int) {
return nil
}
Some hacks I discovered:
#1:
if diff.Id() == "" { return nil }
#2:
if diff.HasChange()
I am trying to fetch data from blockchain using query in chaincode. I have invoked around 2,50,000 records in blockchain and trying to fetch the data using query. When I run the chaincode and get the peer logs, I am getting the below error.
Chaincode error in peer logs:
Here is my code:
queryStringsa := fmt.Sprintf("{\"selector\":{\"$and\":[{\"savesID\":{\"$ne\":\"%s\"}},{\"bankID\":{\"$eq\":\"%s\"}},{\"ytdSavedFlag\":{\"$ne\":\"%s\"}},{\"saveMonthYear\":{\"$eq\":\"%s\"}}]},\"use_index\":[\"_design/indexSavesDataReportDoc\",\"indexSavesDataReportName\"]}","null",bankidsave,"Yes",lastImportDatekey)
queryResultss11sa, errsav := getQueryResultForQueryString(stub, queryStringsa)
// getQueryResultForQueryString
func getQueryResultForQueryString(stub shim.ChaincodeStubInterface, queryString string) ([]byte, error) {
_scbLogger.Infof(string("**********************************"))
_scbLogger.Infof(string("getQueryResultForQueryString queryString : "+ queryString))
_scbLogger.Infof(string("**********************************"))
resultsIterator, err := stub.GetQueryResult(queryString)
if err != nil {
_scbLogger.Error("Error Starting SCB-Efficiency Chaincode is " + string(err.Error()))
return nil, err
}
defer resultsIterator.Close()
// buffer is a JSON array containing QueryRecords
var buffer bytes.Buffer
buffer.WriteString("[")
bArrayMemberAlreadyWritten := false
fmt.Println("resultsIterator length : ", (resultsIterator))
for resultsIterator.HasNext() {
queryResponse, err := resultsIterator.Next()
//fmt.Println("queryresponse inside for next : ", queryResponse)
if err != nil {
fmt.Println("$$$$$$$$$$$ error in reuslt iterator : ", err)
return nil, err
}
// Add a comma before array members, suppress it for the first array member
if bArrayMemberAlreadyWritten == true {
buffer.WriteString(",")
}
buffer.WriteString("{\"Key\":")
buffer.WriteString("\"")
buffer.WriteString(queryResponse.Key)
buffer.WriteString("\"")
buffer.WriteString(", \"Record\":")
// Record is a JSON object, so we write as-is
//fmt.Println("string(queryResponse.Value) : ",string(queryResponse.Value))
buffer.WriteString(string(queryResponse.Value))
buffer.WriteString("}")
bArrayMemberAlreadyWritten = true
}
buffer.WriteString("]")
//fmt.Printf("- getQueryResultForQueryString queryResult:\n%s\n", buffer.String())
return buffer.Bytes(), nil
}
I have 5 set of different queries in same function. sometimes few queries return the query result and sometimes none of the queries gives the result, rather it shows the above error.
When I run the same queries in CouchDB fauxton I am getting the query result. When I run the same function for less number of records, the queries work properly without any errors.
I am trying to read Redis Key-val in Go. Key is string and value is JSON string. Eg- Key=
discov_32161296
and Value as Json string=
"{\"10283\":true,\"11064\":true,\"15123\":true,\"15447\":true,\"15926\":true,\"16530\":true,\"16537\":true,\"16799\":true,\"17088\":true,\"17249\":true,\"18501\":true,\"18529\":true,\"18601\":true,\"3044\":true,\"3687\":true,\"4926\":true,\"5483\":true,\"6\":true,\"6675\":true,\"8332\":true,\"8336\":true,\"8674\":true}"
Getting below error while reading in Go
redis.Values err redigo: unexpected type for Values, got type []uint8
Here's my code :
uIDDiscoveryOffer := fmt.Sprintf("%s_%d", "discov", uid)
opDataStr, err := redis.String(redis.Values(con.Do("GET", uIDDiscoveryOffer)))
if err != nil || err != redis.ErrNil {
utils.Log1("readCacheTxnByUID-Disc-redis.Values-err", fmt.Sprint("redis.Values err : ", uidDiscoveryOffer, " error: ", err.Error()))
} else {
//Some Logic
}
The Redis GET returns the value of a key. redis.Values() may be used to convert the result of a command that returns multiple items.
Since GET returns a single item, only use redis.String(), you don't need redis.Values() here:
opDataStr, err := redis.String(con.Do("GET", uIDDiscoveryOffer))
i am trying to store fund transfer record on hyperledger fabric. i have written chain code in go lang. it work fine when i add data in initLedger function. but when i call it from other function like createTransfer(i will provide both codes) it show successful transaction but when i retrieve chain data .it does not appear in it.
transfer struct
type Transfer struct {
TransferID string `json:"transferID"`
FromAccount string `json:"fromAccount"`
ToAccount string `json:"toAcount"`
Amount string `json:"amount"`
}
this function write data to ledger: it workis fine when i directly call it in initLedger method
func writeTransferToLedger(APIStub shim.ChaincodeStubInterface, transfers []Transfer) sc.Response {
for i := 0; i < len(transfers); i++ {
key := transfers[i].TransferID
chkBytes, _ := APIStub.GetState(key)
if chkBytes == nil {
asBytes, _ := json.Marshal(transfers[i])
err := APIStub.PutState(transfers[i].TransferID, asBytes)
if err != nil {
return shim.Error(err.Error())
}
} else {
msg := "Transfer already exist" + key + " Failure---------------"
return shim.Error(msg)
}
}
return shim.Success([]byte("Write to Ledger"))
}
Call writeToTransferLedger method with in createTransfer function:
func (s *SmartContract) createTransfer(APIStub shim.ChaincodeStubInterface, args []string) sc.Response {
if len(args) != 4 {
return shim.Error("Incorrect Number of arguments for transfer func, Expecting 4")
}
transfers := []Transfer{Transfer{TransferID: args[0], FromAccount: args[1], ToAccount: args[2], Amount: args[3]}}
writeTransferToLedger(APIStub, transfers)
return shim.Success([]byte("stored:" + args[0] + args[1] + args[2] + args[3]))
}
when i call createTransfer from nodesdk code it execute succefully but when i retrive data from chain code not thing return.
i Expect it to work with createTransfer function as it is working with writeTransferToLedger.
inside initLedger method i have created transfer struct with given data and called writeTransferToLedger function code is given below:
transfer := []Transfer{
{TransferID: "1233", FromAccount: "US_John_Doe_123", ToAccount: "UK_Alice_456", Amount: "200"},
{TransferID: "231", FromAccount: "JPY_Alice_456", ToAccount: "UK_John_Doe", Amount: "3000"},
}
writeTransferToLedger(APIstub, transfer)
thanks for your help . i have resolved the issue.
i was calling invoke function when trying to retrieve data from customer ledger.
i have to query the ledger and get transfer data from ledger.
I am writing a function in golang to search for a string in elasticsearch documents which are indexed. I am using elasticsearch golang client elastic. For example consider the object is tweet,
type Tweet struct {
User string
Message string
Retweets int
}
And the search function is
func SearchProject() error{
// Search with a term query
termQuery := elastic.NewTermQuery("user", "olivere")
searchResult, err := client.Search().
Index("twitter"). // search in index "twitter"
Query(&termQuery). // specify the query
Sort("user", true). // sort by "user" field, ascending
From(0).Size(10). // take documents 0-9
Pretty(true). // pretty print request and response JSON
Do() // execute
if err != nil {
// Handle error
panic(err)
return err
}
// searchResult is of type SearchResult and returns hits, suggestions,
// and all kinds of other information from Elasticsearch.
fmt.Printf("Query took %d milliseconds\n", searchResult.TookInMillis)
// Each is a convenience function that iterates over hits in a search result.
// It makes sure you don't need to check for nil values in the response.
// However, it ignores errors in serialization. If you want full control
// over iterating the hits, see below.
var ttyp Tweet
for _, item := range searchResult.Each(reflect.TypeOf(ttyp)) {
t := item.(Tweet)
fmt.Printf("Tweet by %s: %s\n", t.User, t.Message)
}
// TotalHits is another convenience function that works even when something goes wrong.
fmt.Printf("Found a total of %d tweets\n", searchResult.TotalHits())
// Here's how you iterate through results with full control over each step.
if searchResult.Hits != nil {
fmt.Printf("Found a total of %d tweets\n", searchResult.Hits.TotalHits)
// Iterate through results
for _, hit := range searchResult.Hits.Hits {
// hit.Index contains the name of the index
// Deserialize hit.Source into a Tweet (could also be just a map[string]interface{}).
var t Tweet
err := json.Unmarshal(*hit.Source, &t)
if err != nil {
// Deserialization failed
}
// Work with tweet
fmt.Printf("Tweet by %s: %s\n", t.User, t.Message)
}
} else {
// No hits
fmt.Print("Found no tweets\n")
}
return nil
}
This search is printing tweets by the user 'olivere'. But if I give 'olive' then search is not working. How do I search for a string which is part of User/Message/Retweets?
And the Indexing function looks like this,
func IndexProject(p *objects.ElasticProject) error {
// Index a tweet (using JSON serialization)
tweet1 := `{"user" : "olivere", "message" : "It's a Raggy Waltz"}`
put1, err := client.Index().
Index("twitter").
Type("tweet").
Id("1").
BodyJson(tweet1).
Do()
if err != nil {
// Handle error
panic(err)
return err
}
fmt.Printf("Indexed tweet %s to index %s, type %s\n", put1.Id, put1.Index, put1.Type)
return nil
}
Output:
Indexed tweet 1 to index twitter, type tweet
Got document 1 in version 1 from index twitter, type tweet
Query took 4 milliseconds
Tweet by olivere: It's a Raggy Waltz
Found a total of 1 tweets
Found a total of 1 tweets
Tweet by olivere: It's a Raggy Waltz
Version
Go 1.4.2
Elasticsearch-1.4.4
Elasticsearch Go Library
github.com/olivere/elastic
Could anyone help me on this.? Thank you
How you search and find data depends on your analyser - from your code it's likely that the standard analyser is being used (i.e. you haven't specified an alternative in your mapping).
The Standard Analyser will only index complete words. So to match "olive" against "olivere" you could either:
Change the search process
e.g. switch from a term query to a Prefix query or use a Query String query with a wildcard.
Change the index process
If you want to find strings within larger strings then look at using nGrams or Edge nGrams in your analyser.
multiQuery := elastic.NewMultiMatchQuery(
term,
"name", "address", "location", "email", "phone_number", "place", "postcode",
).Type("phrase_prefix")