# Chaincode

[PREV: Deploy a Fabric Network](20-fabric.md) <==> [NEXT: Go Bananas](40-bananas.md)

---

Using the traditional chaincode lifecycle, smart contract deployment requires a Fabric administrator to prepare
and install a chaincode package declaring the contract source code, metadata, and target language/runtime.  When the
contract is committed to a channel, peers are responsible for compiling a custom chaincode binary and launching the
contract as a child process.  This workflow creates several issues for container-based runtimes, where the `build`
phase is additionally responsible for compiling a Docker image, and the `run` phase is responsible for managing the
lifecycle of a chaincode process in a container orchestrator.  

In container based environments such as Kubernetes, the classical chaincode deployment was generally supported with a
custom chaincode server / launcher.

With the introduction of [Chaincode as a Service](https://hyperledger-fabric.readthedocs.io/en/latest/cc_service.html)
(>= 2.4.1), Fabric administrators were provided an alternative deployment option whereby an external chaincode
builder could be configured as a _"no-op builder"_.  Using CCaaS, an administrator could prepare a custom chaincode
container, upload the image to a container registry, launch the chaincode "as a service," and complete the peer
lifecycle using traditional `peer` CLI commands.

While the CCaaS / _no-op_ builder alleviated some mechanical issues and offered full customization of the chaincode
lifecycle, it placed two new major responsibilities on the Fabric network administrator: 

- `build` : The admin must prepare a chaincode image and upload to a container registry.
- `run` : The admin must prepare a `Service`, `Deployment`, and configure TLS for the chaincode endpoint.

_"But - I just want to write some chaincode!"_


In this exercise, we will see how the new [Kubernetes Chaincode Builder](https://github.com/hyperledger-labs/fabric-builder-k8s)
enables an external container build pipeline and eliminates the administrative burdens associated with CCaaS.

Using the fabric-k8s-builder, you will deploy (and iterate) a smart contract definition by:

1. Preparing a chaincode container image and uploading to a distribution registry.
2. Preparing a `type=k8s` chaincode package specifying the unique and immutable [container image digest](https://github.com/opencontainers/image-spec/blob/main/descriptor.md#digests).
3. Using the `peer` CLI binaries to install and commit the smart contract to a channel.


![Fabric k8s Builder](../images/CloudReady/30-chaincode.png)


## Ready?

```shell

just check-network

```


## Set the peer client environment

```shell

export ORG1_PEER1_ADDRESS=${WORKSHOP_NAMESPACE}-org1-peer1-peer.${WORKSHOP_INGRESS_DOMAIN}:443
export ORG1_PEER2_ADDRESS=${WORKSHOP_NAMESPACE}-org1-peer2-peer.${WORKSHOP_INGRESS_DOMAIN}:443

# org1-peer1: 
export CORE_PEER_LOCALMSPID=Org1MSP
export CORE_PEER_ADDRESS=${ORG1_PEER1_ADDRESS}
export CORE_PEER_TLS_ENABLED=true
export CORE_PEER_MSPCONFIGPATH=${WORKSHOP_CRYPTO}/enrollments/org1/users/org1admin/msp
export CORE_PEER_TLS_ROOTCERT_FILE=${WORKSHOP_CRYPTO}/channel-msp/peerOrganizations/org1/msp/tlscacerts/tlsca-signcert.pem
export CORE_PEER_CLIENT_CONNTIMEOUT=15s
export CORE_PEER_DELIVERYCLIENT_CONNTIMEOUT=15s
export ORDERER_ENDPOINT=${WORKSHOP_NAMESPACE}-org0-orderersnode1-orderer.${WORKSHOP_INGRESS_DOMAIN}:443
export ORDERER_TLS_CERT=${WORKSHOP_CRYPTO}/channel-msp/ordererOrganizations/org0/orderers/org0-orderersnode1/tls/signcerts/tls-cert.pem

```

## Docker Engine Configuration

**NOTE: SKIP THIS STEP IF USING `localho.st` AS THE INGRESS DOMAIN**

Configure the docker engine with the insecure container registry `${WORKSHOP_INGRESS_DOMAIN}:5000`

For example:  (Docker -> Preferences -> Docker Engine)
```json
{
  "insecure-registries": [
    "192-168-205-6.nip.io:5000"
  ]
}
```

- apply and restart

## Chaincode Revision

```shell

CHANNEL_NAME=mychannel
VERSION=v0.0.1
SEQUENCE=1

```

## Build the Chaincode Docker Image

```shell

CHAINCODE_NAME=asset-transfer
CHAINCODE_PACKAGE=${CHAINCODE_NAME}.tgz
CONTAINER_REGISTRY=$WORKSHOP_INGRESS_DOMAIN:5000
CHAINCODE_IMAGE=$CONTAINER_REGISTRY/$CHAINCODE_NAME

# Build the chaincode image
docker build -t $CHAINCODE_IMAGE contracts/$CHAINCODE_NAME-typescript

# Push the image to the insecure container registry
docker push $CHAINCODE_IMAGE

```


## Prepare a k8s Chaincode Package

```shell

IMAGE_DIGEST=$(docker inspect --format='{{index .RepoDigests 0}}' $CHAINCODE_IMAGE | cut -d'@' -f2)

infrastructure/pkgcc.sh -l $CHAINCODE_NAME -n localhost:5000/$CHAINCODE_NAME -d $IMAGE_DIGEST

```

## Install the Chaincode

```shell

# Install the chaincode package on both peers in the org 
CORE_PEER_ADDRESS=${ORG1_PEER1_ADDRESS} peer lifecycle chaincode install $CHAINCODE_PACKAGE
CORE_PEER_ADDRESS=${ORG1_PEER2_ADDRESS} peer lifecycle chaincode install $CHAINCODE_PACKAGE

export PACKAGE_ID=$(peer lifecycle chaincode calculatepackageid $CHAINCODE_PACKAGE) && echo $PACKAGE_ID

# Approve the contract for org1 
peer lifecycle \
	chaincode       approveformyorg \
	--channelID     ${CHANNEL_NAME} \
	--name          ${CHAINCODE_NAME} \
	--version       ${VERSION} \
	--package-id    ${PACKAGE_ID} \
	--sequence      ${SEQUENCE} \
	--orderer       ${ORDERER_ENDPOINT} \
	--tls --cafile  ${ORDERER_TLS_CERT} \
	--connTimeout   15s

# Commit the contract on the channel
peer lifecycle \
	chaincode       commit \
	--channelID     ${CHANNEL_NAME} \
	--name          ${CHAINCODE_NAME} \
	--version       ${VERSION} \
	--sequence      ${SEQUENCE} \
	--orderer       ${ORDERER_ENDPOINT} \
	--tls --cafile  ${ORDERER_TLS_CERT} \
	--connTimeout   15s

```

```shell

peer chaincode query -n $CHAINCODE_NAME -C mychannel -c '{"Args":["org.hyperledger.fabric:GetMetadata"]}' | jq

```


# Take it Further 

## Edit, compile, upload, and re-install your chaincode:

```shell

SEQUENCE=$((SEQUENCE + 1))
VERSION=v0.0.$SEQUENCE

```

- Make a change to the contracts/asset-transfer-typescript source code
- build a new chaincode docker image and publish to the local container registry  
- prepare a new chaincode package as above.
- install, approve, and commit as above.


## Install chaincode from a CI Pipeline

```shell

SEQUENCE=$((SEQUENCE + 1))
VERSION=v0.1.3
CHAINCODE_PACKAGE=asset-transfer-typescript-${VERSION}.tgz

```

- Download a chaincode release artifact from GitHub:
```shell

curl -LO https://github.com/hyperledgendary/full-stack-asset-transfer-guide/releases/download/${VERSION}/${CHAINCODE_PACKAGE}

```

- install, approve, and commit as above.


## Debug with Chaincode as a Service

- prepare a chaincode package with connection.json -> HOST IP:9999  (todo: link to dig out)
- compute CHAINCODE_ID=shasum CC package.tgz
- docker run -e CHAINCODE_ID -e CHAINCODE_SERVER_ADDRESS ... $CHAINCODE_IMAGE in a different shell 
- install, approve, commit as above.


## Deploy Chaincode With Ansible

- cp tgz from github releases -> _cfg/
- edit _cfg/cc yaml with package name
- `just ... chaincode`  


---

[PREV: Deploy a Fabric Network](20-fabric.md) <==> [NEXT: Go Bananas](40-bananas.md)