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Make use of ssm parameter for rds replica host #8

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Make use of ssm parameter for rds replica host #8

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2 changes: 1 addition & 1 deletion rds-postgres/admin-login/main.tf
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Original file line number Diff line number Diff line change
Expand Up @@ -41,7 +41,7 @@ module "rotation" {
variables = {
ALTERNATE_USERNAME = coalesce(var.alternate_username, "${var.username}_alt")
PRIMARY_USERNAME = var.username
REPLICA_HOST = can(var.replica_host) ? var.replica_host : ""
REPLICA_HOST_PARAM = can(var.replica_host_param) ? var.replica_host_param : ""
}
}

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19 changes: 13 additions & 6 deletions rds-postgres/admin-login/rotation/lambda_function.py
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@

ALTERNATE_USERNAME = os.environ['ALTERNATE_USERNAME']
PRIMARY_USERNAME = os.environ['PRIMARY_USERNAME']
REPLICA_HOST = os.environ['REPLICA_HOST']
REPLICA_HOST_PARAM = os.environ['REPLICA_HOST_PARAM']


def lambda_handler(event, context):
Expand Down Expand Up @@ -111,6 +111,9 @@ def create_secret(service_client, arn, token):
KeyError: If the secret json does not contain the expected keys

"""
# Setup ssm client
ssm_client = boto3.client('ssm')

# Make sure the current secret exists
current_dict = get_secret_dict(service_client, arn, "AWSCURRENT")

Expand All @@ -127,11 +130,15 @@ def create_secret(service_client, arn, token):
current_dict['password'] = passwd['RandomPassword']

# Add DATABASE_URL to secret
current_dict['DATABASE_URL'] = dict_to_url(current_dict, False)
current_dict['DATABASE_URL'] = dict_to_url(current_dict, "")

if REPLICA_HOST_PARAM:
# Fetch database replica url
replica_url_parameter = ssm_client.get_parameter(Name=REPLICA_HOST_PARAM, WithDecryption=True)
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@jferris jferris Dec 19, 2023

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Do we need to add something to the IAM policy to support this API request?

replica_url = replica_url_parameter['Parameter']['Value']

if REPLICA_HOST:
# Add DATABASE_REPLICA_URL to secret
current_dict['DATABASE_REPLICA_URL'] = dict_to_url(current_dict, True)
current_dict['DATABASE_REPLICA_URL'] = dict_to_url(current_dict, replica_url)

# Put the secret
service_client.put_secret_value(SecretId=arn, ClientRequestToken=token, SecretString=json.dumps(current_dict), VersionStages=['AWSPENDING'])
Expand Down Expand Up @@ -295,9 +302,9 @@ def dict_to_url(secret, replica):
url: DATABASE_URL-style string
"""
if replica:
host = secret['host']
host = replica
else:
host = REPLICA_HOST
host = secret['host']

return "postgres://%s:%s@%s:%s/%s" % (secret['username'],
secret['password'], host, secret['port'],
Expand Down