可以使用AWS Step Functions的Catch块来处理AWS Lambda函数调用中的错误,并使用State Timeout参数来控制状态的超时。以下是一个示例JSON定义:
{
"StartAt": "FirstStep",
"States": {
"FirstStep": {
"Type": "Task",
"Resource": "arn:aws:lambda:us-east-1:123456789:function:myLambda",
"Catch": [
{
"ErrorEquals": [ "TimeoutInSeconds" ],
"Next": "TimeoutError"
},
{
"ErrorEquals": [ "States.ALL" ],
"Next": "GeneralError"
}
],
"TimeoutSeconds": 60,
"Retry": [
{
"ErrorEquals": [ "Lambda.TooManyRequestsException" ],
"MaxAttempts": 2,
"IntervalSeconds": 3
}
],
"End": true
},
"TimeoutError": {
"Type": "Pass",
"Result": {
"Message": "The step function has timed out.",
"ErrorCode": "StepFunction.TimeoutError"
},
"End": true
},
"GeneralError": {
"Type": "Pass",
"Result": {
"Message": "The step function has encountered an error.",
"ErrorCode": "StepFunction.GeneralError"
},
"End": true
}
}
}
上面的示例中,Catch块捕获了AWS Lambda函数在调用期间可能发生的错误。如果函数引发TimeoutInSeconds错误,则状态将转移到TimeoutError状态,如果出现其他错误,则将转移到GeneralError状态。
此外,在Task状态下,TimeoutSeconds参数控制状态的超时时间,Retry参数指定在出现Lambda.TooManyRequestsException错误时要进行的重试策略。
请注意,TimeoutInSeconds错误是自定义错误类型,需要在Lambda函数中显式引发:
import time
def my_lambda_handler(event, context):
start_time = time.monotonic()
timeout = 30 # seconds
while True:
elapsed_time = time.monotonic() - start_time
if elapsed_time > timeout:
raise Exception("TimeoutInSeconds")
# do some work
time.sleep(1)
在上面的示例中,Lambda函数将运行30秒,如果在此期间超时,则引发TimeoutInSeconds错误。这将被Catch块捕获并在状态机中处理。