could not find symbol value for github.com/hyperledger/fabric/core/chaincode/platforms/util

[siddjain]

1. What version of Delve are you using (dlv version)?

$ dlv version
Delve Debugger
Version: 1.3.2
Build: $Id: 569ccbd514fc47c8b4c521b142556867ec5e6917

2. What version of Go are you using? (go version)?

$ go version
go version go1.13.3 darwin/amd64

3. What operating system and processor architecture are you using?

$ uname -a
Darwin WITSC02X6385JGH 18.7.0 Darwin Kernel Version 18.7.0: Thu Jan 23 06:52:12 PST 2020; root:xnu-4903.278.25~1/RELEASE_X86_64 x86_64

4. What did you do?

I tried to debug a program using dlv and following command

/Users/sjain68/go/bin/dlv debug github.com/hyperledger/fabric/cmd/peer --api-version=2 --log=true -- node start

I then inserted breakpoints in the code and paused execution at

> github.com/hyperledger/fabric/core/chaincode/lifecycle.(*Serializer).IsSerialized() /Users/sjain68/go/src/github.com/hyperledger/fabric/core/chaincode/lifecycle/serializer.go:290 (hits goroutine(240):1 total:1) (PC: 0x4e802f9)
   285:			marshaledFieldValue, err := s.Marshaler.Marshal(stateData)
   286:			if err != nil {
   287:				return false, errors.WithMessagef(err, "could not marshal value for key %s", keyName)
   288:			}
   289:
=> 290:			if existingValue, ok := existingKeys[keyName]; !ok || !bytes.Equal(existingValue, util.ComputeSHA256(marshaledFieldValue)) {
   291:				return false, nil
   292:			}
   293:		}
   294:
   295:		return true, nil

After that I tried to run this command

(dlv) call util.ComputeSHA256(marshaledFieldValue)

5. What did you expect to see?

I expected to see result of util.ComputeSHA256(marshaledFieldValue)

6. What did you see instead?

This is what I saw

(dlv) call util.ComputeSHA256(marshaledFieldValue)
2020-03-03T12:24:31-08:00 debug layer=debugger function call util.ComputeSHA256(marshaledFieldValue)
> github.com/hyperledger/fabric/core/chaincode/lifecycle.(*Serializer).IsSerialized() /Users/sjain68/go/src/github.com/hyperledger/fabric/core/chaincode/lifecycle/serializer.go:290 (hits goroutine(240):3 total:3) (PC: 0x4e802f9)
Command failed: could not find symbol value for github.com/hyperledger/fabric/core/chaincode/platforms/util

I am not a Go developer btw.

some more info

(dlv) print existingValue
[]uint8 len: 32, cap: 512, [45,113,139,136,71,63,99,249,55,132,127,145,17,58,252,254,26,167,8,202,212,18,234,57,236,163,155,104,217,86,64,187]
(dlv) print marshaledFieldValue
[]uint8 len: 44, cap: 44, [18,42,10,4,118,115,99,99,18,34,18,32,47,67,104,97,110,110,101,108,47,65,112,112,108,105,99,97,116,105,111,110,47,69,110,100,111,114,115,101,109,101,110,116]

[chainhelen]

It means debugger could not find this method, so can't use call.
You can type funcs util* to see all methods of package util.

[aarzilli]

The problem here is that the util package is ambiguous, the file containing the function you are trying to debug uses github.com/hyperledger/fabric/common/util but Delve is trying to search the method inside github.com/hyperledger/fabric/core/chaincode/platforms/util. We currently do not have a way to disambiguate package names.

[chainhelen]

It seem to be related to this comment

// There's no particular reason to expect the first entry to be the
// correct one if the package name is ambiguous, but trying all possible
// expansions of all types mentioned in the expression is complicated
// and, besides type assertions, users can always specify the type they
// want exactly, using a string.

[siddjain]

Thanks.

[siddjain]

Does this comment: We currently do not have a way to disambiguate package names. mean that even if I wanted to, there is no way to call the correct function from dlv because there is no way to disambiguate it from the dlv command line?