doc: Add developer instructions (#57)

Add documentation that describes how to update the code, build a new
image and test the code changes in a ModelMesh Serving deployment.

---------

Signed-off-by: Christian Kadner <ckadner@us.ibm.com>

README.md

@@ -1,8 +1,10 @@
 [![Build](https://github.com/kserve/modelmesh-runtime-adapter/actions/workflows/build.yml/badge.svg?branch=main)](https://github.com/kserve/modelmesh-runtime-adapter/actions/workflows/build.yml)
 
-# Modelmesh Runtime Adapter
+# ModelMesh Runtime Adapter
 
-This repo contains the unified puller/runtime-adapter image of the sidecar containers which run in the modelmesh-serving model server Pods. See the main [modelmesh-serving](https://github.com/kserve/modelmesh-serving) repo for more details.
+This repo contains the unified puller/runtime-adapter image of the sidecar containers
+which run in the ModelMesh Serving model server Pods. Take a look at the main
+[ModelMesh Serving](https://github.com/kserve/modelmesh-serving) repo for more details.
 
 Logical subcomponents within the image:
 
@@ -12,8 +14,183 @@ Logical subcomponents within the image:
 - [model-mesh-ovms-adapter](model-mesh-ovms-adapter)
 - [model-mesh-torchserve-adapter](model-mesh-torchserve-adapter)
 
-### Build Image
+## Generate sources
 
-```bash
+The gRPC code stubs, interfaces and data access classes have to be generated by the
+[`protoc` compiler](https://protobuf.dev/getting-started/gotutorial/#compiling-protocol-buffers)
+from the `.proto` source files under `internal/proto/*`.
+
+If any of the `.proto` files were modified, run the `protoc` compiler to regenerate
+the respective Go source code. It's recommended to use the developer image, which
+has all the required libraries pre-installed, by running `make run proto.compile`
+instead of `make proto.compile`.
+
+```shell
+make run proto.compile
+```
+
+## Test the code changes
+
+After making code changes, ensure all existing and new functionality still works
+properly by running the unit tests.
+
+```shell
+make test
+```
+
+## Format code
+
+Run the linter to make sure all code style rules are adhered to. The code will
+automatically be formatted if any code style violations are found.
+
+It's recommended to use the developer image, which has all the required libraries
+pre-installed, by running `make run fmt` instead of `make fmt`.
+
+```shell
+make run fmt
+```
+
+## Build the Docker image
+
+Once the code changes have been tested and linted, build a new `modelmesh-runtime-adapter`
+Docker image.
+
+```shell
 make build
 ```
+
+## Push the image to a container registry
+
+Push the newly built `modelmesh-runtime-adapter` image to a container registry.
+Replace the value of the `DOCKER_USER` environment variable to your docker user ID
+and change the `IMAGE_TAG` to something meaningful.
+
+```bash
+export DOCKER_USER="<your-docker-userid>"
+export IMAGE_TAG="dev"
+
+docker tag kserve/modelmesh-runtime-adapter:latest \
+    ${DOCKER_USER}/modelmesh-runtime-adapter:${IMAGE_TAG}
+
+docker push ${DOCKER_USER}/modelmesh-runtime-adapter:${IMAGE_TAG}
+```
+
+## Update the ModelMesh Serving deployment
+
+In order to test the code changes in an existing [ModelMesh Serving](https://github.com/kserve/modelmesh-serving)
+deployment, the newly built container image needs to be added to the
+`model-serving-config` ConfigMap.
+
+### Check existing model serving configuration
+
+First, check if your ModelMesh Serving deployment already has an existing
+`model-serving-config` ConfigMap:
+
+```Shell
+kubectl get configmap
+
+NAME                            DATA   AGE
+kube-root-ca.crt                1      12d
+model-serving-config            1      12d
+model-serving-config-defaults   1      12d
+tc-config                       2      12d
+```
+
+### Create a new model serving config
+
+If you did not already have a `model-serving-config` ConfigMap on your cluster,
+you can create one. Replace the `<your-docker-userid>` placeholder with your
+Docker username. Make sure the value of the `IMAGE_TAG` variable matches
+the one that was pushed to the container registry.
+
+```shell
+export DOCKER_USER="<your-docker-userid>"
+export IMAGE_NAME="${DOCKER_USER}/modelmesh-runtime-adapter"
+export IMAGE_TAG="dev"
+
+kubectl apply -f - <<EOF
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: model-serving-config
+data:
+  config.yaml: |
+    storageHelperImage:
+      name: ${IMAGE_NAME}
+      tag: ${IMAGE_TAG}
+EOF
+```
+
+### Update an existing model serving config
+
+If the ConfigMap list contains `model-serving-config`, save the contents of your
+existing configuration in a local temp file:
+
+```Bash
+mkdir -p temp
+kubectl get configmap model-serving-config -o yaml > temp/model-serving-config.yaml
+```
+
+Add the `storageHelperImage` property to the `config.yaml` string property.
+
+```YAML
+      storageHelperImage:
+        name: your-docker-userid/modelmesh-runtime-adapter
+        tag: latest
+```
+
+Replace the `your-docker-userid` placeholder with _your_ Docker username and make
+sure the `tag` matches the one that was pushed to the container registry earlier.
+
+The complete ConfigMap YAML file _may_ look like this:
+
+```YAML
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: model-serving-config
+  namespace: modelmesh-serving
+data:
+  config.yaml: |
+    podsPerRuntime: 1
+    restProxy:
+      enabled: true
+    scaleToZero:
+      enabled: false
+      gracePeriodSeconds: 5
+    storageHelperImage:
+      name: your-docker-userid/modelmesh-runtime-adapter
+      tag: dev
+```
+
+Apply the ConfigMap to your cluster:
+
+```Bash
+kubectl apply -f temp/model-serving-config.yaml
+```
+
+If you are comfortable using `vi`, you can forgo creating a temp file and edit
+the ConfigMap directly in the terminal:
+
+```Shell
+kubectl edit configmap model-serving-config
+```
+
+### Verify the container images used by the model serving runtime
+
+The `modelmesh-controller` watches the ConfigMap and responds to updates by
+automatically restarting the serving runtime pods using the newly built
+runtime adapter image.
+
+You can check which container images are used by running the following command:
+
+```Shell
+kubectl get pods -o jsonpath='{range .items[*]}{"\n"}{.metadata.name}{"\t"}{range .spec.containers[*]}{.image}{", "}{end}{end}' | sort | column -ts $'\t' | sed 's/, *$//g'
+
+etcd-78ff7867d5-45svw                            quay.io/coreos/etcd:v3.5.4
+minio-6ddbfc9665-gtf7x                           kserve/modelmesh-minio-examples:latest
+modelmesh-controller-64f5c8d6d6-k6rzc            kserve/modelmesh-controller:latest
+modelmesh-serving-mlserver-1.x-84884c6849-s8dw6  kserve/rest-proxy:latest, seldonio/mlserver:1.3.2, your-docker-userid/modelmesh-runtime-adapter:dev, kserve/modelmesh:latest
+modelmesh-serving-mlserver-1.x-84884c6849-xpdw4  kserve/rest-proxy:latest, seldonio/mlserver:1.3.2, your-docker-userid/modelmesh-runtime-adapter:dev, kserve/modelmesh:latest
+```

model-mesh-torchserve-adapter/.gitignore

@@ -0,0 +1,4 @@
+# files generated by tests
+server/testdata/_torchserve_models/mmconfig.properties
+torchserve/mocktorchserve
+main

scripts/build_docker.sh

@@ -29,6 +29,8 @@ usage() {
   exit 1
 }
 
+DOCKER_USER=${DOCKER_USER:-"kserve"}
+IMAGE_TAG=${IMAGE_TAG:-"latest"}
 DOCKER_TARGET="runtime"
 DOCKER_TAG="$(git rev-parse --abbrev-ref HEAD)-$(date +"%Y%m%dT%H%M%S%Z")"
 
@@ -75,8 +77,8 @@ fi
 
 declare -a docker_args=(
   --target "${DOCKER_TARGET}"
-  -t "kserve/modelmesh-runtime-adapter${IMAGE_SUFFIX}:${DOCKER_TAG}"
-  -t "kserve/modelmesh-runtime-adapter${IMAGE_SUFFIX}:latest"
+  -t "${DOCKER_USER}/modelmesh-runtime-adapter${IMAGE_SUFFIX}:${DOCKER_TAG}"
+  -t "${DOCKER_USER}/modelmesh-runtime-adapter${IMAGE_SUFFIX}:${IMAGE_TAG}"
 )
 
 if [[ $DOCKER_TARGET == 'runtime' ]]; then

scripts/run_tests.sh

@@ -15,13 +15,15 @@
 
 set -e
 
-## declare an array variable
-declare -a subpackages=("model-mesh-mlserver-adapter"
-                        "model-mesh-ovms-adapter"
-                        "model-mesh-torchserve-adapter"
-                        "model-mesh-triton-adapter"
-                        "model-serving-puller"
-                        "pullman")
+# declare an array variable with all sub-packages
+declare -a subpackages=(
+  "model-mesh-mlserver-adapter"
+  "model-mesh-ovms-adapter"
+  "model-mesh-torchserve-adapter"
+  "model-mesh-triton-adapter"
+  "model-serving-puller"
+  "pullman"
+)
 
 failed=false
 summary=""