[英]Reading csv from S3 and inserting into a MySQL table with AWS Lambda
I'm trying to automate the loading of a csv into a MySQL table when it's received into a S3 bucket. 我正在尝试自动将csv加载到MySQL表中,当它被收到S3存储桶时。
My strategy is that S3 launches an event when it receives a file into a specified bucket (let's call it 'bucket-file'). 我的策略是S3在收到指定存储桶中的文件时启动一个事件(我们称之为'bucket-file')。 This is event is notified to an AWS Lambda function that will download and process the file inserting each row into a MySql table (let's call it 'target_table').
这是事件被通知给AWS Lambda函数,该函数将下载并处理将每行插入MySql表的文件(让我们称之为'target_table')。
We have to take into consideration that RDS is in a VPC. 我们必须考虑到RDS在VPC中。
The current permission configuration of the bucket is: 存储桶的当前权限配置为:
{
"Version": "2008-10-17",
"Statement": [
{
"Sid": "PublicReadForGetBucketObjects",
"Effect": "Allow",
"Principal": {
"AWS": "*"
},
"Action": "s3:GetObject",
"Resource": "arn:aws:s3:::bucket-file/*"
}
]
}
I've created a role with the following policies, AmazonS3FullAccess and AWSLambdaVPCAccessExecutionRole attached to the AWS Lambda function. 我创建了一个角色,其中包含以下策略:附加到AWS Lambda函数的AmazonS3FullAccess和AWSLambdaVPCAccessExecutionRole。
The lambda code is: lambda代码是:
from __future__ import print_function
import boto3
import logging
import os
import sys
import uuid
import pymysql
import csv
import rds_config
rds_host = rds_config.rds_host
name = rds_config.db_username
password = rds_config.db_password
db_name = rds_config.db_name
logger = logging.getLogger()
logger.setLevel(logging.INFO)
try:
conn = pymysql.connect(rds_host, user=name, passwd=password, db=db_name, connect_timeout=5)
except Exception as e:
logger.error("ERROR: Unexpected error: Could not connect to MySql instance.")
logger.error(e)
sys.exit()
logger.info("SUCCESS: Connection to RDS mysql instance succeeded")
s3_client = boto3.client('s3')
def handler(event, context):
bucket = event['Records'][0]['s3']['bucket']['name']
key = event['Records'][0]['s3']['object']['key']
download_path = '/tmp/{}{}'.format(uuid.uuid4(), key)
s3_client.download_file(bucket, key,download_path)
csv_data = csv.reader(file( download_path))
with conn.cursor() as cur:
for idx, row in enumerate(csv_data):
logger.info(row)
try:
cur.execute('INSERT INTO target_table(column1, column2, column3)' \
'VALUES("%s", "%s", "%s")'
, row)
except Exception as e:
logger.error(e)
if idx % 100 == 0:
conn.commit()
conn.commit()
return 'File loaded into RDS:' + str(download_path)
I've been testing the function and S3 sends the event when a file is uploaded, Lambda connects to the RDS instance and get the notification. 我一直在测试该功能,S3在上传文件时发送事件,Lambda连接到RDS实例并获取通知。 I've checked that the bucket name is 'bucket-file' and the filename is also right.
我已经检查过桶名称是'bucket-file',文件名也是正确的。 The problem is when the function reaches the line
s3_client.download_file(bucket, key,download_path)
where it gets stuck until the lamdba expiration time is reached. 问题是当函数到达行
s3_client.download_file(bucket, key,download_path)
,它会一直停滞,直到达到lamdba到期时间。
Watching the logs it says: 看着日志,它说:
[INFO] 2017-01-24T14:36:52.102Z SUCCESS: Connection to RDS mysql instance succeeded
[INFO] 2017-01-24T14:36:53.282Z Starting new HTTPS connection (1): bucket-files.s3.amazonaws.com
[INFO] 2017-01-24T14:37:23.223Z Starting new HTTPS connection (2): bucket-files.s3.amazonaws.com
2017-01-24T14:37:48.684Z Task timed out after 60.00 seconds
I've also read that if you are working within a VPC, in order to access S3 bucket you have to create a VPC Endpoint that grants access to S3 for this subnet. 我还读到,如果您在VPC中工作,为了访问S3存储桶,您必须创建一个VPC端点,以便为该子网授予对S3的访问权限。 I've also tried this solution but the result is the same.
我也试过这个解决方案,结果是一样的。
I'd appreciate some ideas. 我很欣赏一些想法。
Thanks in advance! 提前致谢!
I finally got it! 我终于明白了!
The problem was the VPC issue. 问题是VPC问题。 As I said, I created an VPC Endpoint to make S3 service accessible form my VPC, but I had my route table wrongly configured.
正如我所说,我创建了一个VPC端点,使我的VPC可以访问S3服务,但我的路由表配置错误。
So, in conclusion, if you are working in a VPC with lambda and you want to access to S3, you need to create a VPC Endpoint. 因此,总而言之,如果您在使用lambda的VPC中工作并且想要访问S3,则需要创建VPC端点。 Besides, if you want to access any other internet service outside your VPC, you need to configure a NAT Gateway.
此外,如果要访问VPC外部的任何其他Internet服务,则需要配置NAT网关。
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