Switch thread polling to a denylist with OCI version fallback - #212

# Python 3.10 Lambda container image using AWS Lambda base image
FROM public.ecr.aws/lambda/python:3.10 AS build-image
# Install build dependencies
RUN yum install -y \
 gcc \
 gcc-c++ \
 make \
 cmake3 \
 libcurl-devel \
 autoconf \
 automake \
 libtool \
 tar \
 gzip \
 && ln -sf /usr/bin/cmake3 /usr/bin/cmake \
 && yum clean all
# Build the runtime interface client from local source
ARG RIC_BUILD_DIR="/home/build/"
RUN mkdir -p ${RIC_BUILD_DIR}
WORKDIR ${RIC_BUILD_DIR}
COPY . .
RUN pip install setuptools
RUN make init build
RUN mv ./dist/awslambdaric-*.tar.gz ./dist/awslambdaric-test.tar.gz
# Copy the function handler
ARG FUNCTION_DIR="/var/task"
RUN mkdir -p ${FUNCTION_DIR}
COPY tests/integration/test-handlers/shutdown-hook/* ${FUNCTION_DIR}
# Final stage - clean runtime image
FROM public.ecr.aws/lambda/python:3.10
ARG FUNCTION_DIR="/var/task"
WORKDIR ${FUNCTION_DIR}
# Copy the function code
COPY --from=build-image ${FUNCTION_DIR} ${FUNCTION_DIR}
# Copy the built RIC tarball and install it, overriding the bundled awslambdaric in /var/runtime
COPY --from=build-image /home/build/dist/awslambdaric-test.tar.gz /tmp/
RUN yum install -y gcc gcc-c++ make cmake3 libcurl-devel tar gzip autoconf automake libtool && \
 ln -sf /usr/bin/cmake3 /usr/bin/cmake && \
 rm -rf /var/runtime/awslambdaric* && \
 rm -f /var/runtime/runtime_client* && \
 pip install /tmp/awslambdaric-test.tar.gz --target /var/runtime && \
 rm /tmp/awslambdaric-test.tar.gz && \
 yum history undo -y last && yum clean all && rm -rf /var/cache/yum
# Install Lambda Insights extension layer (required for graceful shutdown support)
# Download manually before building:
# curl -f -s -o lambda-insights-amd64-64.zip "$(aws lambda get-layer-version-by-arn --region eu-west-1 --arn "arn:aws:lambda:eu-west-1:580247275435:layer:LambdaInsightsExtension:64" --query 'Content.Location' --output text)"
COPY lambda-insights-amd64-64.zip /tmp
# hadolint ignore=DL3033
RUN yum install -y unzip && unzip -q -d /opt /tmp/lambda-insights-amd64-64.zip && rm /tmp/*.zip && \
 yum history undo -y last && yum clean all && rm -rf /var/cache/yum
# Replace AWS_EXECUTION_ENV so the base image's bundled RIC path isn't triggered
RUN sed -i 's/export AWS_EXECUTION_ENV=.*/export AWS_EXECUTION_ENV=AWS_Lambda_Image/' /var/runtime/bootstrap
CMD [ "app.lambda_handler" ]

import json
import platform
import signal
import sys
import time
def exit_gracefully(signum, frame):
 r"""
 SIGTERM Handler: https://docs.aws.amazon.com/lambda/latest/operatorguide/static-initialization.html
 Listening for os signals that can be handled,reference: https://docs.aws.amazon.com/lambda/latest/dg/runtimes-extensions-api.html
 Termination Signals: https://www.gnu.org/software/libc/manual/html_node/Termination-Signals.html
 """
 print("[runtime] SIGTERM received")
 print("[runtime] cleaning up")
 # perform actual clean up work here.
 time.sleep(0.2)
 print("[runtime] exiting")
 sys.exit(0)
signal.signal(signal.SIGTERM, exit_gracefully)
def lambda_handler(event, context):
 return "SUCCESS"

2026年07月02日T17:51:39.669+01:00	LOGS Name: cloudwatch_lambda_agent State: Subscribed Types: [Platform]	
	2026年07月02日T17:51:40.201+01:00	EXTENSION Name: cloudwatch_lambda_agent State: Ready Events: [INVOKE, SHUTDOWN]
	2026年07月02日T17:51:40.208+01:00	START RequestId: be18ce5e-0ef9-4933-917f-ebfc53522ab7 Version: $LATEST
	2026年07月02日T17:51:40.218+01:00	END RequestId: be18ce5e-0ef9-4933-917f-ebfc53522ab7
	2026年07月02日T17:51:40.218+01:00	REPORT RequestId: be18ce5e-0ef9-4933-917f-ebfc53522ab7 Duration: 3.36 ms Billed Duration: 642 ms Memory Size: 512 MB Max Memory Used: 39 MB Init Duration: 637.70 ms
	2026年07月02日T17:57:39.206+01:00	[runtime] SIGTERM received
	2026年07月02日T17:57:39.206+01:00	[runtime] cleaning up
	2026年07月02日T17:57:39.406+01:00	[runtime] exiting