Serverless API’s

Streaming data met AWS Kinesis en Lambda

Maksim Pecherskiy

Data Engineer

Vorige les

Toegang geven tot data

Eenvoudige API

Voeg een trigger toe

Test je nieuwe API

Onze eerste API

API-parameters

Voorbeeldverzoek

https://.../speederReporterApi?date=20200620

Voorbeeldevent

{
  "queryStringParameters": {
    "date": "20200620"
  },
  "isBase64Encoded": false
}

Lambda-handler

import json, boto3
import awswrangler as wr
import pandas as pd

session = boto3.Session(aws_access_key_id = AWS_KEY, 
                        aws_secret_access_key = AWS_SECRET, 
                        region_name="us-east-1")

Lambda-handler

def lambda_handler(event, context):
    filter_date = event['queryStringParameters']['date']

    df = wr.s3.read_csv(
        f"s3://sd-vehicle-data/speeders_daily/{filter_date}.csv", 
        boto3_session=session, 
        delimiter=" ")

Reageren met data

def lambda_handler(event, context):
    ...
    return {
        'statusCode': 200,
        'headers': {
            "content-type" : "application/json"
        },
        'body': df.to_json()
    }

Live response

https://.../default/speederReporterApi?date=20200621

[
  {
      "record_id":"939ed1d1-1740-420c-8906-445278573c7f",
      "timestamp":"4:25:06.000",
      "vin":"4FTEX4944AK844294",
      "lon":106.9447146,
      "lat":-6.3385652,
      "speed":25
  },
  {
      "record_id":"f29a5b3d-d0fa-43c0-9e1a-e2a5cdb8be7a",
      ...
  },

  ...
]

Start een andere Lambda

def trigger_recalc():
  lambda_client = boto3.client("s3", 
                            aws_access_key_id = AWS_KEY, 
                            aws_secret_access_key = AWS_SECRET, 
                            region_name = 'us-east-1')

def lambda_handler(event, context):
  ...

speederAggregator-ARN

Aanroepen

def trigger_recalc():
  ...
  lambda_client.invoke(
    FunctionName='arn:aws:lambda:us-east-1:458913182630:function:speederAggregator',
    InvocationType='Event', # (or RequestResponse)
  )

Herhaling

Laten we oefenen!

Streaming data met AWS Kinesis en Lambda