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#!/usr/bin/env python
# --------------------------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See License.txt in the project root for license information.
# --------------------------------------------------------------------------------------------
"""
Example to demonstrate utilizing azure.core.credentials.AzureSasCredential to authenticate with Event Hubs.
"""
import os
import time
import hmac
import hashlib
import base64
from urllib.parse import quote as url_parse_quote
from azure.core.credentials import AzureSasCredential
from azure.eventhub import EventHubProducerClient, EventData
def generate_sas_token(uri, sas_name, sas_value, token_ttl):
"""Performs the signing and encoding needed to generate a sas token from a sas key."""
sas = sas_value.encode("utf-8")
expiry = str(int(time.time() + token_ttl))
string_to_sign = (uri + "\n" + expiry).encode("utf-8")
signed_hmac_sha256 = hmac.HMAC(sas, string_to_sign, hashlib.sha256)
signature = url_parse_quote(base64.b64encode(signed_hmac_sha256.digest()))
return "SharedAccessSignature sr={}&sig={}&se={}&skn={}".format(uri, signature, expiry, sas_name)
# Target namespace and hub must also be specified. Consumer group is set to default unless required otherwise.
FULLY_QUALIFIED_NAMESPACE = os.environ["EVENT_HUB_HOSTNAME"]
EVENTHUB_NAME = os.environ["EVENT_HUB_NAME"]
# The following part creates a SAS token. A SAS token is typically given to you after being created.
SAS_POLICY = os.environ["EVENT_HUB_SAS_POLICY"]
SAS_KEY = os.environ["EVENT_HUB_SAS_KEY"]
uri = "sb://{}/{}".format(FULLY_QUALIFIED_NAMESPACE, EVENTHUB_NAME)
token_ttl = 3000 # seconds
sas_token = generate_sas_token(uri, SAS_POLICY, SAS_KEY, token_ttl)
credential = AzureSasCredential(sas_token)
producer_client = EventHubProducerClient(
fully_qualified_namespace=FULLY_QUALIFIED_NAMESPACE,
eventhub_name=EVENTHUB_NAME,
credential=credential,
logging_enable=True,
)
start_time = time.time()
with producer_client:
event_data_batch = producer_client.create_batch()
event_data_batch.add(EventData("Single message"))
producer_client.send_batch(event_data_batch)
print("Send messages in {} seconds.".format(time.time() - start_time))
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