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How to use get_lambda_policy method in localstack

Best Python code snippet using localstack_python

import_lambda.py

Source:import_lambda.py

1#External libs2import ast3import boto34import json5import sys6import os7from botocore.exceptions import ClientError8#Establish our boto resources9client = boto3.client('lambda')10session = boto3.session.Session()11region = session.region_name12ec2Client = boto3.client('ec2')13def import_config(lambda_name, alias=False):14    '''15    Uses the lambda name to grab existing lambda configuration16    and import it into a config file17    args:18        lambda_name: the name of the lambda you want to import19        alias: the alias, defaults to $LATEST if not present20    '''21    print('Attempting to import configuration')22    #Create an empty config dict, start with the bare minimum23    config_dict = { 24                    "initializers": {25                        "name": "",26                        "description": "",27                        "region": region,28                        "handler": "",29                        "role": ""30                    },31                    "provisioners": {32                        "runtime": "",33                        "timeout": 0,34                        "mem_size": 035                    }36                }37    #If the user didn't pass an alias we want to use $LATEST38    if not alias:39        alias_used = '$LATEST'40    else:41        alias_used = alias42    try:43        lambda_config = client.get_function(44                            FunctionName=lambda_name,45                            Qualifier=alias_used46                        )47        #Set a variable to make things readable later48        config = lambda_config['Configuration']49    except ClientError as error:50        print(error.response)51        sys.exit(1)52    else:53        #Check to make sure there is a config there54        #print(json.dumps(config, indent=4))55        if 'FunctionName' in config:56            #Grab our initializers57            config_dict['initializers']['name'] = config['FunctionName']58            config_dict['initializers']['handler'] = handler = config['Handler']59            config_dict['initializers']['description'] = config['Description']60            config_dict['initializers']['role'] = config['Role'].split('/')[-1]61            62            #Grab our provisioners63            config_dict['provisioners']['timeout'] = config['Timeout']64            config_dict['provisioners']['mem_size'] = config['MemorySize']65            config_dict['provisioners']['runtime'] = config['Runtime']66            #VPC Work67            sg_ids = config['VpcConfig']['SecurityGroupIds']68            if len(sg_ids) != 0:69                vpc_id = config['VpcConfig']['VpcId']70                config_dict['vpc_setting'] = {"vpc_name": vpc_id, "security_group_ids": sg_ids}     71            else:72                pass73            74            #Tracing config75            trace_config = config['TracingConfig']76            if trace_config['Mode'] != "PassThrough":77                config_dict['initializers']['tracing_mode'] = trace_config['Mode'].lower()78            else:79                pass80            if 'DeadLetterConfig' in config:81                #Split DLQ config so we can grab things easily82                dead_letter_split = config['DeadLetterConfig']['TargetArn'].split(':')83                config_dict['dead_letter_config'] = {"type": dead_letter_split[2], "target_name": dead_letter_split[-1]}84            else:85                pass86            #Variables87            if 'Environment' in config:88                config_dict['variables'] = config['Environment']['Variables']89            else:90                pass91            #Write the alias if needed92            if alias_used != "$LATEST":93                config_dict['initializers']['alias'] = alias94            else:95                pass96            #Set a variable for the ARN97            true_arn = config['FunctionArn'].split(':')[:7]98            function_arn = ":".join(true_arn)99        else:100            print("No Lambda found! Please check your config")101    finally:102        return config_dict, function_arn103def import_triggers(lambda_name, alias=False):104    '''105    Uses the lambda name to grab triggers from existing lambda config106    and import it into a config file107    args:108        lambda_name: 109        alias: 110    '''111    print("Attempting to retrieve lambda triggers")112    try:113        if not alias:114            get_lambda_policy = client.get_policy(115                        FunctionName=lambda_name116                    )117        else:118            get_lambda_policy = client.get_policy(119                            FunctionName=lambda_name,120                            Qualifier=alias121                        ) 122    except ClientError as error:123        print("No policy found")124        principal = ''125        resource = ''126    else:127        policy = ast.literal_eval(get_lambda_policy['Policy'])128        statement_dict = policy['Statement'][0]129        principal = statement_dict['Principal']['Service'].split('.')[0]130        resource = statement_dict['Condition']['ArnLike']['AWS:SourceArn'].split(":")[-1]131    finally:132        return principal, resource133def get_sg_name(sg_id):134    '''135    Grabs the NAME of the security groups, we want them because they are136    friendlier to read than the sg code137    args:138        sg_id: the id of the security group, returned from import_config139    '''140    print('Attempting to retrieve security group names')141    try:142        sg_info = ec2Client.describe_security_groups(143                    GroupIds=sg_id144                )145        group_info = sg_info['SecurityGroups'][0]146    except ClientError as error:147        print(error.response)148        sys.exit(1)149    finally:150        print("Retrieved name for groups %s" % group_info['GroupName'])151        return group_info['GroupName']152def get_vpc_name(vpc_id):153    '''154    Grabs the NAME of the VPC155    args:156        vpc_id: the id the VPC, returned from import_config157    '''158    print('Attempting to retrieve VPC name')159    try:160        vpc_info = ec2Client.describe_vpcs(161                        VpcIds=[vpc_id]162                    )163        vpc_info = vpc_info['Vpcs'][0]164    except ClientError as error:165        print(error.response)166        sys.exit(1)167    else:168        tags = vpc_info['Tags'][0]169        170        if tags['Key'] == 'Name':171            name = tags['Value']172        else:173            print("No VPC found, make sure your VPC is tagged 'Key': 'Name', 'Value': 'Your-VPC'")174            sys.exit(1)175    finally:176        print('Retrieved VPC name %s' % name)177        return name178def get_tags(lambda_arn):179    '''180    Grabs a tags dict from the current lambda181    args:182        lambda_arn: the arn returned from the import config function183    '''184    print('Attempting to retrieve tags')185    try:186        tags = client.list_tags(Resource=lambda_arn)187        tags = tags['Tags']188    except ClientError as error:189        print(error.response)190        sys.exit(1)191    finally:192        return tags193########### Entrypoint ###########194def import_lambda(lambda_name, alias):195    '''196    The main entry point of the module197    args:198        lambda_name: the name of the lambda199        alias: alias of the lambda200    '''201    config_dict, lambda_arn = import_config(lambda_name=lambda_name, alias=alias)202    tag_dict = get_tags(lambda_arn)203    if len(tag_dict) != 0:204        config_dict['tags'] = tag_dict205    if 'vpc_setting' in config_dict:206        config_dict['vpc_setting']['vpc_name'] = get_vpc_name(config_dict['vpc_setting']['vpc_name'])207        config_dict['vpc_setting']['security_group_ids'] = get_sg_name(config_dict['vpc_setting']['security_group_ids'])208    trigger_method, trigger_source = import_triggers(lambda_name=lambda_name, alias=alias)209    210    if len(trigger_method) != 0:211        config_dict['trigger'] = {"method": trigger_method, "source": trigger_source}212    ...

monitoring_lambda.py

Source:monitoring_lambda.py

...10    for statement in policy_statements_id_list:11        print(lambda_wrapper.remove_lambda_permission(12            logs_client, lambda_name, statement))13def get_lambda_policy_statements(logs_client, lambda_name):14    res = json.loads(lambda_wrapper.get_lambda_policy(15        logs_client, lambda_name)['Policy'])16    statements = []17    for r in res["Statement"]:18        statements.append(r["Sid"])19    return statements20def exist_subcription_filter(logs_client, log_group_name):21    subcription_filters = logs_wrapper.list_subcription_filters(logs_client)22    for sflist in subcription_filters:23        for sf in sflist:24            if sf['logGroupName'] == log_group_name:25                return True26    return False27def add_log_group_for_monitoring(lambda_client,28                                 logs_client,29                                 destination_lambda_name,30                                 log_group_name, pattern, region, account):31    if not logs_wrapper.exist_log_group(logs_client, log_group_name):32        raise Exception(f'The {log_group_name} does not exist.')33    response_lambda = lambda_wrapper.add_lambda_permission(34        lambda_client, destination_lambda_name, log_group_name, account, region)35    response_logs = logs_wrapper.create_subcription_filter(36        logs_client, destination_lambda_name, log_group_name, pattern, region, account)37    return {'response': [response_lambda, response_logs]}38def remove_log_group_of_monitoring(lambda_client, logs_client, destination_lambda_name, log_group_name):39    res = json.loads(lambda_wrapper.get_lambda_policy(40        lambda_client, destination_lambda_name)['Policy'])41    statements = res['Statement']42    for s in statements:43        ln = s['Sid'].split('_')[1]44        if ln == log_group_name.split('/')[-1]:45            lambda_wrapper.remove_lambda_permission(46                lambda_client, destination_lambda_name, s['Sid'])47    return logs_wrapper.remove_subcription_filter(logs_client, log_group_name)48def add_lambda_for_monitoring(lambda_client,49                              logs_client,50                              destination_lambda_name,51                              lambda_name, pattern, region, account):52    log_group_name = "/aws/lambda/{}".format(lambda_name)53    if not logs_wrapper.exist_log_group(logs_client, log_group_name):54        logs_wrapper.create_lambda_log_group(logs_client, lambda_name)55    response_lambda = lambda_wrapper.add_lambda_permission(56        lambda_client, destination_lambda_name, log_group_name, account, region)57    response_logs = logs_wrapper.create_subcription_filter(58        logs_client, destination_lambda_name, log_group_name, pattern, region, account)59    return {'response': [response_lambda, response_logs]}60def remove_lambda_of_monitoring(lambda_client, logs_client, destination_lambda_name, lambda_name):61    res = json.loads(lambda_wrapper.get_lambda_policy(62        lambda_client, destination_lambda_name)['Policy'])63    statements = res['Statement']64    for s in statements:65        ln = s['Sid'].split('_')[1]66        if ln == lambda_name:67            lambda_wrapper.remove_lambda_permission(68                lambda_client, destination_lambda_name, s['Sid'])69    return logs_wrapper.remove_subcription_filter(logs_client, "/aws/lambda/{}".format(lambda_name))70if __name__ == "__main__":71    print(lambda_wrapper.invoke_lambda_function(72        lambda_client, "hello-world-lambda-py", {}))73    # print(json.dumps(logs_wrapper.list_logs_events(...

utils.py

Source:utils.py

...15    region_name=os.environ.get('AWS_REGION') or 'us-east-1'16)17cloud_watch = session.client('logs')18lambda_func = session.client('lambda')19def get_lambda_policy():20    try:21        lambda_policy = lambda_func.get_policy(FunctionName=LOG_SHIPPER_FUNCTION).get("Policy")22        return json.loads(lambda_policy)23    except ClientError as error:24        raise error25def remove_lambda_permissions(sid):26    try:27        remove_permission = lambda_func.remove_permission(FunctionName=LOG_SHIPPER_FUNCTION, StatementId=sid)28        return remove_permission29    except ClientError as error:...

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