问题
I would like to try the custom C++ runtime for AWS Lambda and testing it locally using SAM. Unfortunately I get the error Runtime exited without providing a reason (compare error details below). How can I run C++ Lambda functions locally with SAM?
Approach:
I am following the exact steps described in official C++ Introduction blog, up to the last step of "Create your C++ function". The rest of the blog is about deploying the function on Lambda (which I DO NOT want to do, since I would like to use SAM locally).
In order to use SAM, I am putting a template.yaml in the build dir. The structure of the build dir now looks like this:
├── CMakeCache.txt
├── CMakeFiles
| |...
├── cmake_install.cmake
├── hello
├── hello.zip
├── Makefile
└── template.yaml
6 directories, 37 files
This is the content of the template.yaml in the build dir:
AWSTemplateFormatVersion: "2010-09-09"
Transform: AWS::Serverless-2016-10-31
Description: >
cpp hello world
Globals: # default settings across all resources if nothing else is specified
Function:
Timeout: 15
Resources:
HelloWorldFunction:
Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
Properties:
CodeUri: hello.zip # relative location or S3 key
Handler: hello # function to handle call? Why is this hello and not main?
Runtime: provided
Events:
HelloWorld: # the name of the event
Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
Properties:
Path: /hello
Method: get
Outputs:
HelloWorldApi:
Description: "API Gateway endpoint URL for Prod stage for Hello World function"
Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/hello/"
HelloWorldFunction:
Description: "Hello World Lambda Function ARN"
Value: !GetAtt HelloWorldFunction.Arn
HelloWorldFunctionIamRole:
Description: "Implicit IAM Role created for Hello World function"
Value: !GetAtt HelloWorldFunctionRole.Arn
Invoke:
I am running sam local start-api --debug in the debug folder.
I am invoking the function by going to 127.0.0.1:3000/hello in chrome.
Error:
Some details from the message that results from invoking the URL:
...
Invoking hello (provided)
Decompressing /home/path/to/folder/test_cpp_local/aws-lambda-cpp/build/hello_cpp/build/hello.zip
Fetching lambci/lambda:provided Docker container image......
Mounting /tmp/tmpm9djt4mb as /var/task:ro,delegated inside runtime container
/var/task/bin/hello: error while loading shared libraries: /var/task/lib/libc.so.6: file too short
START RequestId: 3435a342-d86d-1a59-df1a-10167070cd22 Version: $LATEST
END RequestId: 3435a342-d86d-1a59-df1a-10167070cd22
REPORT RequestId: 3435a342-d86d-1a59-df1a-10167070cd22 Init Duration: 29.71 ms Duration: 0.00 ms Billed Duration: 100 ms Memory Size: 128 MB Max Memory Used: 6 MB
{
"errorType": "Runtime.ExitError",
"errorMessage": "RequestId: 3435a342-d86d-1a59-df1a-10167070cd22 Error: Runtime exited without providing a reason"
}
Function returned an invalid response (must include one of: body, headers, multiValueHeaders or statusCode in the response object
...
My System:
I am building on a Ubuntu 16.04 using cmake 3.5.1, g++ 4.5.0, gcc 4.5.0
Ideas how to solve this:
I somehow have to build remote on a machine that uses AWS Linux (I hope that this is not the case)
I could use the CloudFormationPackage as recommended here stackoverflow. I would like to avoid this, since I would like to test locally only.
回答1:
The problem is likely here:
/var/task/bin/hello: error while loading shared libraries: /var/task/lib/libc.so.6: file too short
Your binary does not even invoke.
You should be able to resolve this problem by building the binary on matching version of AWS Linux or by building a static binary.
回答2:
Run inside a docker container
I assume that this is an issue with SAM. I was able to this just the way I build it using docker-lambda. For this I had to extract hello.zip and than call it with
docker run --rm -v "<path/to/hello>":/var/task lambci/lambda:provided handler
Using this workaround I did not need to build statically.
Build inside a docker container
You can also build inside an amazonlinux container. A hello_world Dockerfile would look like this (includes the program itself):
FROM amazonlinux:latest
RUN yum -y install make
RUN yum -y install git
RUN yum -y install gcc-c++
RUN yum -y install nano
RUN yum -y install zip
RUN yum -y install clang
RUN yum -y install gcc-c++
RUN yum -y install libcurl-devel
RUN yum -y install cmake3
RUN export CC=gcc && \
export CXX=g++ && \
cd ~ && \
git clone https://github.com/awslabs/aws-lambda-cpp.git && \
cd aws-lambda-cpp && \
mkdir build && \
cd build && \
cmake3 .. -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=OFF -DCMAKE_INSTALL_PREFIX=~/out && \
make &&\
make install && \
mkdir hello-cpp-world && \
cd hello-cpp-world && \
echo -e "// main.cpp\n#include <aws/lambda-runtime/runtime.h>\nusing namespace aws::lambda_runtime;\ninvocation_response my_handler(invocation_request const& request)\n{\n return invocation_response::success(\"Hello, World!\", \"application/json\");\n}\n\nint main()\n{\nrun_handler(my_handler);\n return 0; \n}" >> main.cpp && \
echo -e "cmake_minimum_required(VERSION 3.5)\nset(CMAKE_CXX_STANDARD 11)\nproject(hello LANGUAGES CXX)\nfind_package(aws-lambda-runtime REQUIRED)\nadd_executable(hello \"main.cpp\")\ntarget_link_libraries(hello PUBLIC AWS::aws-lambda-runtime)\naws_lambda_package_target(hello NO_LIBC)" >> CMakeLists.txt && \
mkdir build &&\
cd build &&\
cmake3 .. -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH=~/out && \
make && \
make aws-lambda-package-hello
RUN cd / && \
cp /root/aws-lambda-cpp/build/hello-cpp-world/build/hello.zip /artifacts/hello.zip
Important is, that if you are building in an amazonlinux environment, you have to include aws_lambda_package_target(hello NO_LIBC) to your CMakeLists.txt. This is in order to not include the C runtime as a dependency.
In the example I mounted a folder called artifacts inside my container, to which I am copying the resulting zip file.
来源：https://stackoverflow.com/questions/58451803/how-to-run-a-c-aws-lambda-function-locally-with-sam