CCM-12616: Replaced mesh-poll Lambda with a skeleton Python version

Author: gareth-allan

infrastructure/terraform/components/dl/module_lambda_mesh_poll.tf

@@ -20,10 +20,10 @@ module "mesh_poll" {
 
   function_s3_bucket      = local.acct.s3_buckets["lambda_function_artefacts"]["id"]
   function_code_base_path = local.aws_lambda_functions_dir_path
-  function_code_dir       = "mesh-poll/dist"
+  function_code_dir       = "mesh-poll/target/dist"
   function_include_common = true
-  handler_function_name   = "handler"
-  runtime                 = "nodejs22.x"
+  handler_function_name   = "mesh_poll.handler.handler"
+  runtime                 = "python3.9"
   memory                  = 128
   timeout                 = 5
   log_level               = var.log_level

lambdas/mesh-poll/.eslintignore

@@ -1,4 +1,2 @@
-coverage
-node_modules
-dist
-.reports
+__pycache__
+.venv

lambdas/mesh-poll/.gitignore

@@ -0,0 +1,28 @@
+PACKAGE=mesh_poll
+VERSION=0.1.0
+
+audit:
+	poetry run python -m jake.app ddt -t POETRY -f poetry.lock
+
+install:
+	poetry install
+
+test:
+	poetry run pytest
+
+test-coverage:
+	poetry run pytest --cov --cov-report xml:target/coverage/@comms/mesh-poll-lambda/cobertura-coverage.xml
+
+lint:
+	poetry run pylint mesh_poll
+
+format:
+	poetry run autopep8 -ri .
+
+package:
+	./package_python_lambda.sh meshpolllambda
+
+clean:
+	rm -rf target
+
+.PHONY: install test test-coverage lint format package clean

lambdas/mesh-poll/Makefile

@@ -0,0 +1,5 @@
+"""Mesh Poll"""
+
+__version__ = '0.1.0'
+from .config import *
+from .handler import *

lambdas/mesh-poll/jest.config.ts

@@ -0,0 +1,7 @@
+"""
+Module for configuring Mesh Poll application
+"""
+import structlog
+
+structlog.configure(processors=[structlog.processors.JSONRenderer()])
+log = structlog.get_logger()

lambdas/mesh-poll/mesh_poll/__init__.py

@@ -0,0 +1,8 @@
+"""lambda handler for mesh poll application"""
+
+from .config import log
+
+
+def handler(_, __):
+    """lambda handler for mesh poll application"""
+    log.info('Polling for new messages from MESH...')

lambdas/mesh-poll/mesh_poll/config.py

@@ -14,11 +14,14 @@
   "name": "nhs-notify-digital-letters-mesh-poll",
   "private": true,
   "scripts": {
-    "lambda-build": "rm -rf dist && npx esbuild --bundle --minify --sourcemap --target=es2020 --platform=node --loader:.node=file --entry-names=[name] --outdir=dist src/index.ts",
-    "lint": "eslint .",
-    "lint:fix": "eslint . --fix",
-    "test:unit": "jest",
-    "typecheck": "tsc --noEmit"
+    "audit": "make audit",
+    "lambda-build": "make package",
+    "lint": "make lint",
+    "lint:fmt": "make format",
+    "python-install": "make install",
+    "test:unit": "make test",
+    "test:unit:coverage": "make test-coverage",
+    "typecheck": "echo this package contains no typescript"
   },
   "version": "0.0.1"
 }

lambdas/mesh-poll/mesh_poll/handler.py

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+set -e
+
+component_name="$1"
+
+rootdir=$(realpath "$(dirname "$0")/../..")
+source ${rootdir}/utils/get_version.sh
+
+VERSIONED_ZIP_NAME="NHSD.comms."${component_name}-"${point_version}"".zip"
+
+dist_dir="${PWD}/target/dist"
+build_dir="${PWD}/target/python-build"
+mkdir -p "${dist_dir}"
+rm -rf "${build_dir}"
+mkdir -p "${build_dir}"
+rm -rf "${dist_dir}/${VERSIONED_ZIP_NAME}"
+
+# poetry config virtualenvs.in-project true
+
+# this asserts we are using the right pip+python
+poetry install --only-root
+source .venv/bin/activate
+
+# now bundle dependencies from lock file
+poetry export -f requirements.txt --output target/all_requirements.txt --without dev
+grep -v file:// target/all_requirements.txt > target/external_requirements.txt
+grep file:// target/all_requirements.txt > target/internal_requirements.txt
+pip install --platform manylinux2014_x86_64 --only-binary=:all: -r target/external_requirements.txt --target ${build_dir} --no-deps
+pip install -r target/internal_requirements.txt --target ${build_dir} --no-deps
+
+# now bundle application code
+pip install . --no-deps --target ${build_dir}
+
+# and construct the build artefact
+cd ${build_dir} && zip -r "${dist_dir}/${VERSIONED_ZIP_NAME}" .