python - Running perl script in lambda function with python3.6 runtime

Question

I am trying to run an exiftool for reading image meta data within a python script, as part of a lambda function on AWS.

On an ec2 instance running amazon linux, which is what the python3.6 runtime uses, I can download the tool, extract it, then run it easily. However, trying to do this from my python script in the lambda function does not work.

My lambda function is as follows:

import imageio
import subprocess
import utils
import os
import stat
import boto3

s3_client = boto3.client('s3')

# get exif tool
s3_client.download_file(
    'zipped.code',
    'Image-ExifTool-11.53.tar.gz', 
    '/tmp/Image-ExifTool-11.53.tar.gz')
p = subprocess.run('tar -zxvf Image-ExifTool-11.53.tar.gz', cwd='/tmp', shell=True)

def get_meta_data(im):
    p = subprocess.Popen(
        '/tmp/Image-ExifTool-11.53/exiftool -',
        stdout=subprocess.PIPE,
        stdin=subprocess.PIPE,
        stderr=subprocess.PIPE,
        shell=True)
    out, err = p.communicate(input=imageio.imwrite('<bytes>', im, format='jpg'))
    print(out) # b''
    print(err) # b'/bin/sh: /tmp/Image-ExifTool-11.53/exiftool: /usr/bin/perl: bad interpreter: No such file or directory\n'


def lambda_handler(event, context):
    src_key = event['src_key']
    image = utils.download_image_to_memory(src_key)
    print(get_meta_data(image))

I have ran this code locally and it works. If I print the contents of /usr/bin within the lambda function by print(os.listdit('/usr/bin')) there is no perl executable in there. However in the /usr/bin directory on an ec2 instance with amazon linux the perl executable is there.

I suspect the problem is my lack of perl (the tool is written in perl), but why is there no perl interpretter given that lambdas are supposed to run with the amazon linux image?

标签： pythonperlaws-lambda

Answer 1

尝试将https://p3rl.org/AWS::Lambda中列出的 ARN 之一添加到您的引用层（那里有说明）。

我自己没有这样做，但从我所看到的一切来看，它应该可以工作。