Prometheus client library packages not found in chain code container spun by peer container

[pvrbharg]

Hi,

I am trying to custom instrument my sample chaincode example_cc using Prometheus client golang library. The program works correctly natively in non-container environment. It fails at run time when I try to containerize the change [specifically at the instantiate step - when peer container tries to build chaincode example_cc with shim into an image and start the image in its own dev chaincode container]. I have used Go Module dependency resolution. I am using go.mod and go.sum mechanisms to resolve dependencies. I am seeing the following errors:
++++
hlbcadmin@ubuntu:~/go/src/github.com/securekey/fabric-examples/fabric-cli/cmd/fabric-cli$ go run fabric-cli.go chaincode instantiate --cid orgchannel --ccp=github.com/securekey/example_cc --ccid ExampleCC --v v0 --args '{"Args":["A","1","B","2"]}' --policy "AND('Org1MSP.member','Org2MSP.member')" --config ../../test/fixtures/config/config_test_local.yaml
[fabriccli] 2019/06/12 13:06:05 UTC - chaincode.glob..func4 -> ERRO Error while running instantiateAction: error instantiating chaincode: sending deploy transaction proposal failed: Transaction processing for endorser [localhost:7051]:
Chaincode status Code: (500) UNKNOWN. Description: error starting container: error starting container: Failed to generate platform-specific docker build: Error returned from build: 1 "chaincode/input/src/github.com/securekey/example_cc/example_cc.go:27:5: cannot find package "github.com/prometheus/client_golang/prometheus" in any of:
/opt/go/src/github.com/prometheus/client_golang/prometheus (from $GOROOT)
/chaincode/input/src/github.com/prometheus/client_golang/prometheus (from $GOPATH)
/opt/gopath/src/github.com/prometheus/client_golang/prometheus
chaincode/input/src/github.com/securekey/example_cc/example_cc.go:29:2: cannot find package "github.com/prometheus/client_golang/prometheus/promauto" in any of:
/opt/go/src/github.com/prometheus/client_golang/prometheus/promauto (from $GOROOT)
/chaincode/input/src/github.com/prometheus/client_golang/prometheus/promauto (from $GOPATH)
/opt/gopath/src/github.com/prometheus/client_golang/prometheus/promauto
chaincode/input/src/github.com/securekey/example_cc/example_cc.go:28:5: cannot find package "github.com/prometheus/client_golang/prometheus/promhttp" in any of:
/opt/go/src/github.com/prometheus/client_golang/prometheus/promhttp (from $GOROOT)
/chaincode/input/src/github.com/prometheus/client_golang/prometheus/promhttp (from $GOPATH)
/opt/gopath/src/github.com/prometheus/client_golang/prometheus/promhttp
"
++++

My question - where exactly should I stage my vendor folder with client library packages for Prometheus and how do I make the child container spun by peer with chaincode+shim in to find the Prometheus client packages?

I am willing to share my project as a zip file if that helps. Thanks.

[pvrbharg]

Dear team, I had some detailed discussions in the rocket chat with @nyet and @troyronda - per team wisdom - I may be underestimating the effort here... Not sure - I did various experiments and none of them are working or bearing fruits with the outcomes I had in mind. I did vendor where all I thought I should do and still the result ended up in failure. As I said - I am willing to share my project tree if it helps. My latest experimental results are in the attachment. I also posted a question for our fabric developers in the fabric chat and waiting for some response. I can connect with the developers and contributors directly if I need to.
fabricsdkgo-vendoring-issue-June162019.txt
Thanks.