我目前有一个 lambda 函数,该函数使用作为参数传递的值更新 DynamoDB 表。我能够在 Lambda 控制台中运行以下命令,并将测试参数设置为 "TEST"
:
import boto3
import json
def lambda_handler(event, context):
# TODO implement
update_ami(event)
def update_ami(ami_id):
#DO STUFF
我正在尝试从从以下 JSON 文档构建的 SSM 自动化调用它:
{
"description":"Test Execute Lambda Function.",
"schemaVersion":"0.3",
"assumeRole":"MYARN",
"parameters":{},
"mainSteps":[
{
"name": "invokeMyLambdaFunction",
"action": "aws:invokeLambdaFunction",
"maxAttempts": 3,
"timeoutSeconds": 120,
"onFailure": "Abort",
"inputs": {
"FunctionName": "MyLambdaFunction",
"Payload": "TESTER"
}
}
]
}
执行此自动化会导致以下错误:
Automation Step Execution fails when it is invoking the lambda function. Get Exception from Invoke API of lambda Service. Exception Message from Invoke API: [Could not parse request body into json: Unrecognized token 'TESTER': was expecting ('true', 'false' or 'null')
我还尝试将Payload
输入作为 JSON 对象而不是字符串传递,并相应地调整了我的 lambda 方法:
JSON 自动化:
...
"inputs": {
"FunctionName": "MyLambdaFunction",
"Payload": {
"ami_id": "AMI-TESTER"
}
}
...
Lambda Python:
def lambda_handler(event, context):
# TODO implement
update_ami(event['ami-id'])
这会导致来自 SSM 控制台中的自动化文档编辑器的以下错误:
Input {ami_id=TESTER} is of type class java.util.LinkedHashMap, but expected type is String.
所以简而言之...如何将单个字符串从自动化文档传递到 Lambda 函数?
显示的错误似乎是有效负载未作为字符串传递的问题:
Input {ami_id=TESTER} is of type class java.util.LinkedHashMap, but expected type is String
请尝试在双引号前使用转义字符。
"inputs": {
"FunctionName": "MyLambdaFunction",
"Payload": "{
"ami_id": "AMI-TESTER"
}"
}
AWS 提供了正确的语法(如果您看到此 URL
{
"name":"updateSsmParam",
"action":"aws:invokeLambdaFunction",
"timeoutSeconds":1200,
"maxAttempts":1,
"onFailure":"Abort",
"inputs":{
"FunctionName":"Automation-UpdateSsmParam",
"Payload":"{"parameterName":"latestAmi", "parameterValue":"{{createImage.ImageId}}"}"
}
}