lambda客户端调用函数并从MQ读取json消息并将其发送到AWS Kinesis

Question

I have two lambda function written in python.

1- subscriber.py (Will connect to AWS MQ, collect and displays the message)

import time
import boto3
import stomp
import json
global message

lambda_client = boto3.client('lambda')

class Listener(stomp.ConnectionListener):
    def on_error(self, headers, message):
        print('received an error "%s"' % message)

    def on_message(self, headers, message):
        print('received a message in subscriber : "%s"' % message)
        invoke_response = lambda_client.invoke(FunctionName="op_worker",
                                           InvocationType='Event',
                                           Payload=json.dumps(message)
                                           )
        #print('invoke_response a message in subscriber : "%s"' % invoke_response)
        print("terstesfsff")
        print (invoke_response['Payload'].read())
def lambda_handler(event, context):
    conn = stomp.Connection(host_and_ports=[('b-4714-4441-8166-1.mq.eu-central-1.amazonaws.com', 61614)])
    lst = Listener()
    conn.set_listener('Listener', lst)
    conn.set_ssl(for_hosts=[('b-4714-4441-8166-1.mq.eu-central-1.amazonaws.com', 61614)])
    conn.start()
    print('CONNECTION Started')
    conn.connect(login='test_mq', passcode='test_secure_mq',wait=True)
    print('CONNECTION established')
    conn.subscribe(destination='/queue/', id=1, ack='auto')
    print('CONNECTION Subscribed')
    time.sleep(10)
    conn.disconnect()
    return

2- worker.py (Which needs to collect message from subscriber.py function and pass this message to Kinesis)

import time
import boto3
import stomp
import json

lambda_client = boto3.client('lambda')
kinesis_client = boto3.client('kinesis')

def lambda_handler(event, context):

    #print (invoke_response['Payload'].read())
    print('received a message in worker : "%s"' % message)
    kinesis_client.put_record(
            StreamName='',
            Data=b'bytes',
            PartitionKey='1'
        )
    return { 
        'message' : message
    }

Error message while I am executing subscriber.py Lambda function:-

    Response:
null

Request ID:
"009406bc-f334-11e8-950f-fde41035f262"

Function Logs:
START RequestId: 009406bc-f334-11e8-950f-fde41035f262 Version: $LATEST
CONNECTION Started
CONNECTION established
CONNECTION Subscribed
received a message in subscriber : "{

  "rateChange":{

    "contractCode":"DOPC/DOPC0004/W19",
    "sourceMarketGroup":"TNO"
}
}"
terstesfsff
b''
END RequestId: 009406bc-f334-11e8-950f-fde41035f262
REPORT RequestId: 009406bc-f334-11e8-950f-fde41035f262  Duration: 10255.69 ms   Billed Duration: 10300 ms   Memory Size: 128 MB Max Memory Used: 33 MB

Error message on worker.py:-

    {
  "errorMessage": "name 'message' is not defined",
  "errorType": "NameError",
  "stackTrace": [
    [
      "/var/task/op_worker.py",
      12,
      "lambda_handler",
      "print('received a message in worker : \"%s\"' % message)"
    ]

Subscriber Cloudwatch events

Worker Cloudwatch events

Answer 1

Here's the problem:

1. Your subscriber.py returns no error, but rather what is supposed to return. It returns b'' as response from your worker.py call because worker.py yields no result
2. worker.py returns error because there's no variable called message . The json you send as function parameter when calling worker.py is inside the event object and you should access the information you are sending through event .

Answer 2

Updated code for worker:-

import time
import boto3
import stomp
import json

lambda_client = boto3.client('lambda')
kinesis_client = boto3.client('kinesis')

def lambda_handler(event, context):
    print('received a message in worker : "%s"' % event)
    kinesis_client.put_record(
            StreamName='OnePurchasing',
            Data=b'bytes',
            PartitionKey='1'
        )