It there any way to use Stub.GetQueryResult?

[r3code]

I want to read data as a sorted list. I added CouchDB query:

func list(c router.Context) (interface{}, error) {
	queryString := `{
        "selector": {},
        "sort": [
            {"id": "asc"}
        ]
	}`

	iter, err1 := c.Stub().GetQueryResult(queryString)
	if err1 != nil {
		return nil, errors.Wrap(err1, "failed to GetQueryResult")
	}
	defer iter.Close()

	items := []interface{}{}
	for iter.HasNext() {
		kvResult, err := iter.Next()
		if err != nil {
			return nil, errors.Wrap(err1, "fetch error")
		}
		item := QueueItem{}
		err2 := json.Unmarshal(kvResult.Value, &item)
		if err2 != nil {
			return nil, errors.Wrap(err1, "value unmarshal error")
		}
		items = append(items, item)
	}
	return items, nil
}

But the test by mock tells me `failed to GetQueryResult: not implemented.
Is it so because I run the test with mock?

[vadiminshakov]

Yes, it's because of MockStub: https://github.com/hyperledger/fabric/blob/release-1.4/core/chaincode/shim/mockstub.go#L290

[r3code]

@vadiminshakov Thanks! I'll use a real network then for such tests.

[akoita]

Hi,

After having noticed the limitations of the mock which is in the Fabric source code, I came across CCKit which offers a mock with more possibilities and especially an advanced testing approach with Ginkgo and Gomega.

But I notice that an essential operation like the simulation of CouchDB requests is not supported. Do you plan to add this feature? How else do you test the operations of your chaincodes that execute CouchDB queries?

For information, this other implementation of the chaincode stub in TypesScript provides support for testing CouchDB requests: https://github.com/wearetheledger/fabric-mock-stub.

[vitiko]

Hi, at the moment we don't have plans to add a simulation of CouchDB requests, cause we mostly use encrypted protobuf marshaling to bytes and rich queries can't work with encrypted data. But you can try to do it for the case of JSON data modeling and add pull requests.

[akoita]

Hi,
All right, I understand.
For now, I don't plan to implement the simulation of CouchDB requests either, but it would be a pleasure to submit a PR if I happen to implement it.