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Allows querying DynamoDB instead of scanning #7

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Allows querying DynamoDB instead of scanning #7

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80 changes: 70 additions & 10 deletions python_dycasbin/adapter.py
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Original file line number Diff line number Diff line change
@@ -1,8 +1,7 @@
import hashlib

import boto3
from casbin import persist

from casbin import persist, Model

class Adapter(persist.Adapter):
"""the interface for Casbin adapters."""
Expand All @@ -22,6 +21,14 @@ def __init__(self, table_name='casbin_rule', **kwargs):
{
'AttributeName': 'id',
'AttributeType': 'S'
},
{
'AttributeName': 'v0',
'AttributeType': 'S'
},
{
'AttributeName': 'v1',
'AttributeType': 'S'
}
],
KeySchema=[
Expand All @@ -30,10 +37,41 @@ def __init__(self, table_name='casbin_rule', **kwargs):
'KeyType': 'HASH'
},
],
ProvisionedThroughput={
'ReadCapacityUnits': 10,
'WriteCapacityUnits': 10
}
GlobalSecondaryIndexes=[
{
'IndexName': 'v0-v1-index',
'KeySchema': [
{
'AttributeName': 'v0',
'KeyType': 'HASH'
},
{
'AttributeName': 'v1',
'KeyType': 'RANGE'
},
],
'Projection': {
'ProjectionType': 'ALL',
}
},
{
'IndexName': 'v1-v0-index',
'KeySchema': [
{
'AttributeName': 'v1',
'KeyType': 'HASH'
},
{
'AttributeName': 'v0',
'KeyType': 'RANGE'
},
],
'Projection': {
'ProjectionType': 'ALL',
}
},
],
BillingMode='PAY_PER_REQUEST'
)
except self.dynamodb.exceptions.ResourceInUseException:
pass
Expand Down Expand Up @@ -70,10 +108,7 @@ def get_filtered_item(self, ptype, rules):

return data

def load_policy(self, model):
"""load all policies from database"""
response = self.dynamodb.scan(TableName=self.table_name)

def load_policy_lines(self, response, model):
for i in response['Items']:
persist.load_policy_line(self.get_line_from_item(i), model)

Expand All @@ -89,6 +124,31 @@ def load_policy(self, model):
if "LastEvaluatedKey" in response and response["LastEvaluatedKey"] == "from_pytest":
break

def load_policy(self, model):
"""load all policies from database"""
response = self.dynamodb.scan(TableName=self.table_name)
self.load_policy_lines(response, model)

def load_filtered_policy_by_sub(self, model: Model, sub: str) -> None:
response = self.dynamodb.query(
TableName=self.table_name,
IndexName='v0-v1-index',
Select='ALL_ATTRIBUTES',
KeyConditionExpression='v0 = :v0',
ExpressionAttributeValues={':v0':{'S': sub}}
)
self.load_policy_lines(response, model)

def load_filtered_policy_by_obj(self, model: Model, obj: str) -> None:
response = self.dynamodb.query(
TableName=self.table_name,
IndexName='v1-v0-index',
Select='ALL_ATTRIBUTES',
KeyConditionExpression='v1 = :v1',
ExpressionAttributeValues={':v1':{'S': obj}}
)
self.load_policy_lines(response, model)

def get_line_from_item(self, item):
"""make casbin policy string from dynamodb item"""
line = item['ptype']['S']
Expand Down