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July 29, 2020 11:52
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import os | |
import json | |
import uuid | |
import boto3 | |
# Inside docker use docker dns name localstack | |
# os.environ['LOCALSTACK_SQS_ENDPOINT_URL'] = 'http://localstack:4576' | |
# If your connecting to the localstack outside docker use host dns | |
# each aws service has its own endpoint url ensure boto3 client is configured accordingly | |
# you can change endpoint_url to point to any local aws stack e.g aws local dynamodb instance | |
os.environ['LOCALSTACK_SQS_ENDPOINT_URL'] = 'http://localhost:4576' | |
os.environ['AWS_ACCESS_KEY_ID'] = 'foo' | |
os.environ['AWS_SECRET_ACCESS_KEY'] = 'bar' | |
os.environ['AWS_DEFAULT_REGION'] = 'us-east-1' | |
if os.environ.get('LOCALSTACK_SQS_ENDPOINT_URL'): | |
sqs = boto3.client("sqs", endpoint_url = os.environ.get('LOCALSTACK_SQS_ENDPOINT_URL')) | |
else: | |
sqs = boto3.client("sqs") | |
body = { | |
"time": { | |
"updated": "Jul 4, 2020 14:12:00 UTC", | |
"updatedISO": "2020-07-04T14:12:00+00:00", | |
"updateduk": "Jul 4, 2020 at 15:12 BST" | |
}, | |
"disclaimer": "This data was produced from the CoinDesk Bitcoin Price Index (USD). Non-USD currency data converted using hourly conversion rate from openexchangerates.org", | |
"bpi": { | |
"USD": { | |
"code": "USD", | |
"rate": "9,083.8632", | |
"descriptio n": "United States Dollar", | |
"rate_float": 9083.8632 | |
}, | |
"BTC": { | |
"code": "BTC", | |
"rate": "1.0000", | |
"description": "Bitcoin", | |
"rate_float": 1 | |
} | |
} | |
} | |
# Below is your typical message sending and receiving with long polling | |
response = sqs.send_message( | |
QueueUrl='http://localhost:4576/000000000000/blockchain-local-engine-input.fifo', | |
MessageBody=json.dumps(body), | |
DelaySeconds=3, | |
MessageDeduplicationId=str(uuid.uuid4()), | |
MessageGroupId='blockchain', | |
MessageAttributes={ | |
"contentType": { | |
"StringValue": "application/json", "DataType": "String"} | |
} | |
) | |
# WaitTimeSeconds=20 enables longer polling this means less read cycles to SQS reducing your costs if running in production | |
messages = sqs.receive_message(QueueUrl='http://localhost:4576/000000000000/blockchain-local-engine-input.fifo', | |
AttributeNames=['All'], MaxNumberOfMessages=10, WaitTimeSeconds=20, VisibilityTimeout=30) | |
messages = messages.get("Messages", []) | |
print('Total messages = {}'.format(len(messages))) | |
for message in messages: | |
message_body = json.loads(message.get('Body')) | |
print(message_body) | |
sqs.delete_message( | |
QueueUrl='http://localhost:4576/000000000000/blockchain-local-engine-input.fifo', | |
ReceiptHandle=message.get("ReceiptHandle")) | |
messages = sqs.receive_message(QueueUrl='http://localhost:4576/000000000000/blockchain-local-engine-input.fifo', | |
AttributeNames=['All'], MaxNumberOfMessages=10, WaitTimeSeconds=20, | |
VisibilityTimeout=30) | |
messages = messages.get("Messages", []) | |
print('Total messages remaining ={}'.format(len(messages))) | |
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