add xgboost server rock and tests

xgbserver/README.md

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+## Testing
+
+### Prerequisites
+
+* docker
+* Google Cloud CLI tools ([installation guide](https://cloud.google.com/sdk/docs/install))
+
+### Instructions
+
+From the [upstream usage example](https://kserve.github.io/website/master/modelserving/v1beta1/xgboost/), this rock can be tested locally using:
+
+Launch the server with:
+```
+# download the model locally
+mkdir sample_model
+gsutil cp -r gs://kfserving-examples/models/xgboost/iris ./sample_model/
+
+# mount the model into the container at runtime
+docker run -p 8080:8080 -v $(pwd)/sample_model/iris:/mnt/models xgbserver:<version> --model_name test_model --model_dir=/mnt/models --http_port=8080
+
+```
+
+Test the server with:
+```
+cat <<EOF >> iris-input-v2.json
+{
+  "inputs": [
+    {
+      "name": "input-0",
+      "shape": [2, 4],
+      "datatype": "FP32",
+      "data": [
+        [6.8, 2.8, 4.8, 1.4],
+        [6.0, 3.4, 4.5, 1.6]
+      ]
+    }
+  ]
+}
+EOF
+
+curl -v \
+  -H "Content-Type: application/json" \
+  -d @./iris-input-v2.json \
+  localhost:8080/v2/models/test_model/infer
+```
+
+which should return the expected output described in the docs.  

xgbserver/dummy_pyproject.toml

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+[tool.poetry]
+name = "workaround-for-editable-install"
+version = "0.0.1"
+description = ""
+authors = ["none"]
+
+[tool.poetry.dependencies]
+# This range should match that used in upstream's server pyproject.toml
+python = ">=3.8,<3.12"
+kserve = { path = "../python/kserve", develop = false }
+xgbserver = { path = "../python/xgbserver", develop = false }
+

xgbserver/rockcraft.yaml

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+# Based on https://github.com/kserve/kserve/blob/master/python/xgb.Dockerfile
+# 
+# See ../CONTRIBUTING.md for more details about the patterns used in this rock. 
+# This rock is implemented with some atypical patterns due to the native of the upstream
+# Dockerfile.
+name: xgbserver
+summary: xgboost server for Kserve deployments
+description: "Kserve xgboost server"
+version: "0.11.2"
+license: Apache-2.0
+base: [email protected]
+platforms:
+    amd64:
+run-user: _daemon_
+services:
+  xgbserver:
+    override: replace
+    summary: "xgbserver server service"
+    startup: enabled
+    command: "python -m xgbserver [ ]"
+entrypoint-service: xgbserver
+
+parts:
+  security-team-requirement:
+    plugin: nil
+    override-build: |
+      mkdir -p ${CRAFT_PART_INSTALL}/usr/share/rocks
+      (echo "# os-release" && cat /etc/os-release && echo "# dpkg-query" && \
+      dpkg-query --root=${CRAFT_PROJECT_DIR}/../bundles/ubuntu-22.04/rootfs/ -f '${db:Status-Abbrev},${binary:Package},${Version},${source:Package},${Source:Version}\n' -W) \
+      > ${CRAFT_PART_INSTALL}/usr/share/rocks/dpkg.query
+
+  python:
+    plugin: nil
+    source: https://github.com/kserve/kserve.git
+    source-subdir: python
+    source-tag: v0.11.2
+    build-packages:
+      - libgomp1
+    overlay-packages:
+    - python3.10  
+    # Including python3-pip here means pip also gets primed for the final rock
+    - python3-pip
+    override-build: |
+      # Populate the build system's python environment with all packages needed for 
+      # the server in the final rock
+
+      # Setup poetry
+      pip install poetry==1.4.0
+      poetry config virtualenvs.create false 
+
+      # Install the kserve package, this specific server package, and their dependencies.
+      mkdir -p ./python_env_builddir
+      cp -rf $CRAFT_PROJECT_DIR/dummy_pyproject.toml ./python_env_builddir/pyproject.toml
+      (cd python_env_builddir && poetry install --no-interaction --no-root)
+
+      # Promote the packages we've installed from the local env to the primed image
+      mkdir -p $CRAFT_PART_INSTALL/usr/local/lib/python3.10/dist-packages
+      cp -fr /usr/local/lib/python3.10/dist-packages/* $CRAFT_PART_INSTALL/usr/local/lib/python3.10/dist-packages/
+
+      # TODO: why do we need this?
+      mkdir -p $CRAFT_PART_INSTALL/usr/local/share
+      cp -fr /usr/local/share/* $CRAFT_PART_INSTALL/usr/local/share/
+
+      # Ensure `python` is an executable command in our primed image by making
+      # a symbolic link
+      mkdir -p $CRAFT_PART_INSTALL/usr/bin/
+      ln -s /usr/bin/python3.10 $CRAFT_PART_INSTALL/usr/bin/python
+
+  # Copy licenses
+  third-party:
+    plugin: nil
+    after: [python]
+    source: https://github.com/kserve/kserve.git
+    source-subdir: python
+    source-tag: v0.11.2
+    override-build: |
+      cp -fr third_party/* ${CRAFT_PART_INSTALL}/third_party
+

xgbserver/tests/test_rock.py

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+# Copyright 2024 Canonical Ltd.
+# See LICENSE file for licensing details.
+
+from pathlib import Path
+
+import os
+import logging
+import random
+import pytest
+import string
+import subprocess
+import yaml
+
+from charmed_kubeflow_chisme.rock import CheckRock
+
+
+@pytest.fixture()
+def rock_test_env(tmpdir):
+    """Yields a temporary directory and random docker container name, then cleans them up after."""
+    container_name = "".join(
+        [str(i) for i in random.choices(string.ascii_lowercase, k=8)]
+    )
+    yield tmpdir, container_name
+
+    try:
+        subprocess.run(["docker", "rm", container_name])
+    except Exception:
+        pass
+    # tmpdir fixture we use here should clean up the other files for us
+
+
+@pytest.mark.abort_on_fail
+def test_rock(rock_test_env):
+    """Test rock."""
+    temp_dir, container_name = rock_test_env
+    check_rock = CheckRock("rockcraft.yaml")
+    rock_image = check_rock.get_name()
+    rock_version = check_rock.get_version()
+    LOCAL_ROCK_IMAGE = f"{rock_image}:{rock_version}"
+
+    # assert we have the expected files
+    subprocess.run(
+        [
+            "docker",
+            "run",
+            "--entrypoint",
+            "/bin/bash",
+            LOCAL_ROCK_IMAGE,
+            "-c",
+            "ls -la /usr/local/lib/python3.10/dist-packages/xgbserver",
+        ],
+        check=True,
+    )
+    subprocess.run(
+        [
+            "docker",
+            "run",
+            "--entrypoint",
+            "/bin/bash",
+            LOCAL_ROCK_IMAGE,
+            "-c",
+            "ls -la /usr/local/lib/python3.10/dist-packages/kserve",
+        ],
+        check=True,
+    )
+    subprocess.run(
+        [
+            "docker",
+            "run",
+            "--entrypoint",
+            "/bin/bash",
+            LOCAL_ROCK_IMAGE,
+            "-c",
+            "ls -la /third_party",
+        ],
+        check=True,
+    )
+

xgbserver/tox.ini

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+# Copyright 2024 Canonical Ltd.
+# See LICENSE file for licensing details.
+[tox]
+skipsdist = True
+skip_missing_interpreters = True
+envlist = pack, export-to-docker, sanity, integration
+
+[testenv]
+setenv =
+    PYTHONPATH={toxinidir}
+    PYTHONBREAKPOINT=ipdb.set_trace
+    CHARM_REPO=https://github.com/canonical/kserve-operators.git
+    CHARM_BRANCH=main
+    LOCAL_CHARM_DIR=charm_repo
+
+[testenv:pack]
+passenv = *
+allowlist_externals =
+    rockcraft
+commands =
+    rockcraft pack
+
+[testenv:export-to-docker]
+passenv = *
+allowlist_externals =
+    bash
+    skopeo
+    yq
+commands =
+    # pack rock and export to docker
+    bash -c 'NAME=$(yq eval .name rockcraft.yaml) && \
+             VERSION=$(yq eval .version rockcraft.yaml) && \
+             ARCH=$(yq eval ".platforms | keys | .[0]" rockcraft.yaml) && \
+             ROCK="$\{NAME\}_$\{VERSION\}_$\{ARCH\}.rock" && \
+             DOCKER_IMAGE=$NAME:$VERSION && \
+             echo "Exporting $ROCK to docker as $DOCKER_IMAGE" && \
+             skopeo --insecure-policy copy oci-archive:$ROCK docker-daemon:$DOCKER_IMAGE'
+
+[testenv:sanity]
+passenv = *
+deps =
+    pytest
+    charmed-kubeflow-chisme
+commands =
+    # run rock tests
+    pytest -s -v --tb native --show-capture=all --log-cli-level=INFO {posargs} {toxinidir}/tests
+
+[testenv:integration]
+passenv = *
+allowlist_externals =
+    echo
+commands =
+    # TODO: Implement integration tests here
+    echo "WARNING: This is a placeholder test - no test is implemented here."