paco.models

An object model for semantic cloud infrastructure.

paco.models parses a directory of YAML files that compose an Paco project and loads them into a complete object model.

What's in the model?

The model defines common logical cloud infrastructure concepts, such as networks, accounts, applications and environments.

The model uses network and applications as hierarchical trees of configuration that can have their values over rode when they are placed into environments. Environments live in a network and contain applications, and typically represent the stages of the software development lifecycle (SDLC), such as 'development', 'staging' and 'production'.

The model has a declarative schema that explicitly defines the fields for each object type in the model. This schema declares not only type (e.g. string, integer) but can also declare defaults, min and max values, constrain to specific values, and define invariants that ensure that if one field has a specific value, another fields value is compatabile with that. The model will validates these fields when it loads a Paco project.

Developing

Install this package with your Python tool of choice. Typically set-up a virtualenv and pip install the dependencies in there:

python -m venv env

./env/bin/pip install -e .

There are unit tests using PyTest. If you are using VS Code you can turn on the "Py Test Enabled" setting and run "Discover Unit Tests" command.

Generated Vocabulary

The module paco.models.gen_vocabulary is dynamically generated by the script paco_update_gen_vocabulary.

To run this script first install the paco.models (pip install -e .) project. Then create an IAM User in an active AWS account with read-only access and save them in your .aws/credentials file. If you aren't using the default profile name, you can set the AWS_PROFILE environment variable.

The paco.models buildout will create a handy profile.sh to set this up for you:

buildout
source profile.sh

Changelog for paco.models

7.7.1 (2020-12-31)

Added

• ReleasePhases for DeploymentPipeline CodeBuild actions.

7.7.0 (2020-12-23)

Changed

• Add support for Network Load Balaners. New IloadBalancer base class and IApplicationLoadBalancer and INetworkLoadBalancer classes. The LBApplication class has been renamed to ApplicationLoadBalancer.

Added

• AlarmDescription metadata now includes a 'ref' field, which is the paco.ref parts to the Alarm resource.

• Constraint for IS3BucketPolicy and IStatement for the condition field to check for valid AWS Constraint.

• IBackupPlan has new copy_actions field.

• Initial schemas for DynamoDB.

Fixed

• AdminIAMUsers for IAccount is now a container with a name.

• ListenerRules for IListener for load balancers is now a container with a name.

• CloudFrontOrigins for ICloudFront is now a container with a name.

• CloudFrontFactories for ICloudFront is now a container with a name.

7.6.1 (2020-11-12)

Added

• Added codedeploy_agent to field to EC2LaunchOptions.

7.6.0 (2020-11-07)

Fixed

• Cross-account netenv refs are properly detected and don't get munged.

• add_stack_hooks can be called before or after template initialization and be registred.

• IoTPolicy now works with Services.

Added

• Add add_paco_suffix field to S3Bucket resource.

• Lambda Triggers for CognitoUserPool

• Path fields that go to a local path can now use ~/ to expand to the home directory path.

• IECSServices has setting_groups field.

• IApiGatewayResource has child_resources and enable_cors fields.

• New method Project.get_all_resources_by_type() which depends upon a Project resource registry which contains a dict of all application resources grouped by type. Easily query across applications!

• loader has a validate_local_paths to allow loading the model from a CI/CD or other environments that may not have local paths available.

• New IBinaryFileReference to load binary files.

• CloudFront LambdaFunctionAssociation support and Lambda@Edge initial support.

• Initial Cognito support with resource types for ICognitoUserPool and ICognitoIdentityPool.

• TargetGroup has a target_type field.

• ECSServices has Fargate support.

• ECSService has a target_tracking_scaling_policies for service scaling.

• Helpful errors for misconfigured AlarmSets.

• Added monitoring to ECSServices and ECSCluster.

• Added ecr_repositories to IDeploymentPipelineBuildCodeBuild to simplify declaring ECR Repository permissions.

• Added a add_stack_hooks to paco.models.base.Resource.

Changed

• YAML file loading now accounts for case-sensitive filesystems, but allowing for directory names and filenames to either be lower-case or capitalized.

• Renamed IApiGatewayMethod for ApiGatewayRestApi from resource_id to resource_name to better reflect the name matches the resources of the gatewway.

• Renamed IAWSCertificateManager to IACM so that it matches it's Resource Type name.

• ApiGatewayRestApi doesn't supply a name in it's CloudFormation export

7.5.0 (2020-09-17)

Added

• Added paco.models.registry as a place to contain configuration that extends or changes Paco.

• Added IIAMUserResource as an application-level IAMUser resource.

• Minimal IPinpointApplication schema for AWS Pinpoint support.

• AlarmSets and CWLogging are loaded into project.monitor. These are used by paco describe feature.

• Added extend_base_schema hook to the loader to allows Services to extend schemas before the loader loads.

• Container loader can load empty objects (objects with no fields, only a name)

Changed

• paco.modes.services.list_service_plugins changed to list_enabled_services. Returns ony enabed services in a dict format.

• IIAMUserProgrammaticAccess changed to IEnablable and now defaults to True.

• The ICloudFrontCustomErrorResponse field error_caching_min_ttl has a default of 300.

• PyLance detected fixes: re-arrange IRDS schema so it no longer provides IResource. https://github.com/microsoft/pylance-release

7.4.0 (2020-07-14)

Added

• DeploymentPipeline now has an ECR.Source action.

• Added IEnablable that is the same as IDeployable except it defaults to true.

• Added IRDSMysqlAurora and IRDSPostgresqlAurora for Aurora support.

• Added users and groups to resource/ec2.yaml and ssh_access to IASG.

• ECSSerivce additional fields for deployment_maximum_percent, deployment_minimum_healthy_percent and health_check_grace_period_seconds.

• ISecretManagerSecret now has an account field to specify it belongs to a specific account.

Changed

• IDeploymentPipelineStageAction uses IEnablable so that deployment actions are enabled by default.

• ISNSTopic uses IEnablable so that topics are enabled by default.

7.3.0 (2020-06-22)

Added

• ICodeCommitUser has a permissions field that can be ReadWrite or ReadOnly.

• IDeploymentPipelineBuildCodeBuild has a buildspec field.

• New paco.models.gen_vocabulary of vocabularies dynamically generated from AWS API calls. Added vocabulary for AWS AMI Ids.

• paco.ref function now supports a : synatx to pass extra context to a function

• New paco.aws package with paco.ref function calls. First call is paco.aws.ami_id:latest.amazon-linux-2-ecs

• ECS Cluster with initial EC2 AutoScalingGroup support.

• New resource/sns.yaml fiel with SNS global resource to allow SNS Topics and Subscriptions to be provisioned across any combination of accounts/regions.

• AWS Config support added in resource/config.yaml.

• ICloudTrail now has a kms_users field which is a list of IAM Users granted access to encrypted CloudTrail logs.

Changed

• ISNSTopics has a locations field. This only applies for resource/sns.yaml

• The IASG instance_iam_role field is no longer a required field.

• The home / config_folder is now a pathlib.Path object.

7.2.0 (2020-05-09)

Added

• Added IASG.launch_options.ssm_agent to indicate if SSM Agent should be installed.

• Added IRDSPostgresql with RDS for Postgresql support. Added complete list of RDS EngineVerions for Mysql and Postgresql to vocabulary.

Changed

• Vocabulary for instance_ami_type expanded to include OS major release or other significant attributes.

• Added poll_for_source_changes to IDeploymentPipelineSourceGitHub.

• Lambda:code:zipfile can now be a path to a local directory.

7.1.0 (2020-04-04)

Migration

• ASG field's update_policy_max_batch_size and update_policy_min_instances_in_service are removed. Instead use the ASG field rolling_update_policy and set max_batch_size and min_instances_in_service.

Added

• New managed_policies for IIAMUserPermissionCustomPolicy to allow easily adding AWS Managed Policies.

• IIoTAnalyticsPipeline, IIoTTopicRule and IIoTPolicy schemas and implementation to support core IoT ingestion and analysis.

• IListener has an ssl_policy for setting the SslPolicy for a SSL Listener.

7.0.2 (2020-03-14)

Fixed

• Restore cfn-init wget command.

7.0.1 (2020-03-14)

Added

• IDeploymentPipelineDeployS3 has input_artifacts field for Stages/Actions.

7.0.0 (2020-03-06)

Migration

• NotifcationGroups was renamed to SNSTopics. Migration: git mv resource/NotificationGroups.yaml resource/snstopics.yaml

• IEventsRule now has an IEventTarget instead of just a paco.ref to the target. This allows you to specify the input_json for the target.

Added

• IManagedPolicy has a policy_name field which can be used to specify the name of IAM Policy in AWS.

• IDeploymentPipelineSourceGitHub to model GitHub.Source actions for CodePipeline.

• IDeploymentPipeline has a stages field which can be used to create more flexible Stages and Actions than the pre-baked source/build/deploy fields.

Changed

• IS3Resource now has an IS3Buckets instead of a dict and references for global buckets has been cleaned up.

Fixed

• All IVPC schemas with dicts have been replaced by INamed objects so that they can provide a paco_ref.

6.4.1 (2020-02-19)

Added

• New IVersionControl schema for a IProject configuration.

6.4.0 (2020-02-17)

Added

• IElasticsearchDomain schema.

• ASG has instance_ami_ignore_changes field to indicate the AMI Id is being updated externally.

• paco.ref function can now call any arbitrary Python function.

• Add enabled_state for IEventRule.

• Added log_group_names and expire_events_after_days to ILambda to allow it to manage Log Groups and set a Retention period.

Changed

• Superflous ICodeCommitRepositoryGroups was removed and ICodeCommit is the container now for an ICodeCommitRepositoryGroup.

Fixed

• Fix errors thrown by loader when loading environments with empty config.

6.3.7 (2020-02-05)

Added

• Full set of fields for generate_secret_string for Secrets.

Fixed

• Lambda.add_environment_variable was not passing the parent.

6.3.6 (2020-01-29)

Added

• Error message when cfn-init files with !Sub and !Join can't be parsed.

6.3.5 (2020-01-23)

Fixed

• Ubuntu awscli install had extra whitespace which could stop up UserData.

6.3.4 (2020-01-16)

Added

• Added external_resource field for ICodeCommit.

6.3.3 (2020-01-09)

Added

• The TextReference class was renamed PacoRefernce and can now be passed schema_constraint with the name or Schema that it must be a reference to.

• Support for users and groups in cfn-init. Invariant to prevent user name duplicating group name.

Changed

• Temporarily disable chmod 400 check on .credentials to support filesystems that don't have permissions.

• CodeCommit contains CodeCommitRepositoryGroups and CodeCommitRepostory group objects instead of a two-level dict. Fixes docs and simplifies loader.

Fixed

• Lambad.add_environment_variable passes parent.

6.3.2 (2020-01-06)

Changed

• Schema clean-up, removed IMapping for all schemas that do not actually use it.

• Removed unused managed_udpates field for IApplication.

6.3.1 (2020-01-03)

Added

• IRoute53HealthCheck has ip_address field.

• resource/snstopics.yaml is an alias for resource/notificationgroups.yaml

• raise_invalid_reference method to display helpful message when a ref look-up fails.

Fixed

• cfn-init package sets were only loading for item, now loads all package types.

• ICloudWatchLogSource log_stream_name is a required field, if it's empty the agent won't launch.

6.3.0 (2019-12-03)

Added

• ICloudWatchDashboard for CloudWatch Dashboard resources.

• Route53 Health Checks have domain_name and enable_sni fields.

Changed

• Invariant errors in schema checks have non-confusing error message.

6.2.1 (2019-11-29)

• Fixes for the AIM to paco rename.

6.2.0 (2019-11-28)

Changed

• Package rename: paco.models is now paco.models, consistent with the tool being renamed to paco.

• Top-level directories have been renamed to be consistent with their names in the model: NetworkEnvironments --> netenv Resources --> resource Services --> service Accounts --> account MonitorConfig --> monitor The loader will look for NetworkEnvironments and if it exists use the legacy names.

Added

• Added support for AWS Backup Vault. There can now be global backup_vaults field in NetworkEnvironment YAML files. These can be overrode in EnvironmentDefault and EnvironmentRegion configuration sections.

• Added support for block_device_mappings for IASG.

6.1.0 (2019-11-06)

Added

• Applications can be provisioned in the same environment more than once with a new "app{suffix}" syntax for an environments application keys.

• INotificationGroups has a regions field, if it is the default of ['ALL'] it will apply to all of a project's active regions. Otherwise is will just provision in the selected region(s).

• ICloudFormationInit for modelling AWS::CloudFormation::Init, which can be applied to the IASG.cfn_init field.

• ICloudWatchLogAlarm schema. ICloudWatchAlarm now has "type: Alarm" and if it is "type: LogAlarm" an ICloudWatchLogAlarm will be created which can be used to connect an alarm to a MetricFilter of a LogGroup.

• IDBParameterGrouups resource.

• IElastiCache has description and cache_clusters fields, while IElastiCacheRedis has snapshot_retention_limit_days and snapshot_window fields.

• IRDS has new license_model, cloudwatch_logs_export and deletion_protection fields.

• global_role_name field for IAM Role can be set to True and the RoleName will not be hashed. Can only be used for global Roles, otherwise if these Roles overlap per-environment, things will break!

• monitoring.health_checks which can contain HealthCheck Resources. IRoute53HealthCheck resource for Route53 health checks.

• region_name property can be overrode if a overrode_region_name attribute is set.

• Added a CodeBuild IAM Permission for IAM Users

• Added resolve_ref method to DeploymentPipelineConfiguration

• Added the EIP Application Resource and a support 'eip' field to the ASG resource for associating an EIP with a single instance ASG.

• Added AWS Cli install commands to vocabulary.

• Added dns to EIP Application Resource

• Added cftemplate_iam_user_delegates_2019_10_02 legacy flag to make user delegate role stack names consistent with others.

• Added route53_hosted_zone_2019_10_12 legacy flag for Route53 CFTemplate refactor.

• Added route53_record_set_2019_10_16 legacy flag for the Route53 RecordSet refactor.

• Added availability_zone for locking in an ASG to a single Availability Zone.

• Added parameter_group to IElastiCache Application Resource

• Added vpc_associations to IPrivateHosted.

• Added vpc_config to the ILambda Application Resources

• Added secrets_manager to IIEnvironmentDefault.

• Added ttl to IDNS

• Added caching to instance AMI ID function.ref lookups.

• Added the EBS Application Resources. Added ebs_volume_mounts to IASG to mount volumes to single instance groups.

• Added launch_options to IASG as an IEC2LaunchOptions object. The initial option is update_packages which will update the linux distributions packages on launch.

• Added resolve_ref() to Resource in base.py as a catch all.

Changed

• ISecurityGroupRule source_security_group was moved to IIngressRule and IEgressRule (finally!) has a destination_security_group field.

• load_resources was removed and you can now simply apply_attributes to an Application and it will recurse through app.groups..resources. without any external fiddling.

• Moved deepdiff CLI functions into aim project.

• IApplication is now IMonitorable. Alarms at the Application level must specify their Namespace and Dimensions.

• Changed RDS primary_domain_name and primary_hosted_zone to an IDNS object

Fixed

• Alarm overrides are now cast to the schema of the field. Fixes "threshold: 10" loading as in int() when the schema expects a float().

6.0.0 (2019-09-27)

Added

• ICloudWatchAlarms have enable_ok_actions and enable_insufficient_data_actions booleans that will send to the notification groups when the alarm enters the OK or INSUFFICIENT_DATA states.

• references.get_model_obj_ref will resolve an paco.ref to a model object and won't attempt to do Stack output lookups.

• Service plug-ins are loaded according to an initilization_order integer that each plug-in can supply. If no integer is supplied, loading for unordered plug-ins count up from 1000.

• Minimal API Gateway models for Methods, Resources, Models and Stages.

• S3Bucket NotificationConfiguration for Lambdas.

• S3Bucket has get_bucket_name() to return the full computed bucket name.

• IGlobalResources for project['resource'] to contain config from the ./Resources/ directory. Resources such as S3 and EC2 now implement INamed and are loaded into project['resource'].

• ISNSTopic has cross_account_access which grants sns:Publish to all accounts in the AIM Project.

• IAccountContainer and IRegionContainer are lightweight containers for account and region information. They can be used by Services that want to set-up Resources in a multi-account, multi-region manner.

Changed

• CloudTrail defines CloudWatchLogGroup as a sub-object rather than an paco.ref.

• Alarms have get_alarm_actions_paco_refs renamed from get_alarm_actions as alarms can only provide paco.refs and need to get the ARNs from the stacks.

• NotificationGroups are now Resources. Now they have regular working paco.ref's.

5.0.0 (2019-08-26)

Added

• New field paco.models.reference.FileReference which resolves the path and replaces the original value with the value of the file indicated by the path. IApiGatewayRestApi.body_file_location uses this new field.

• ApiGatewayRestApi and CloudWatchAlarm have a cfn_export_dict property that returns a new dict that can be used to created Troposphere resources.

• Added external_resource support to the ACM

• Added ReadOnly support to the Administrator IAMUserPermission

Changed

• Multi-Dimension Alarms now need to specify an paco.ref as the Value.

• Added IAMUser schemas and loading for IAM users.

• Added a CommaList() schema type for loading comma separated lists into schema.List()

• Moved aim reference generation into the Model. Model objects now have .paco_ref and .paco_ref_parts properties which contain their paco.ref reference.

• Renamed project['ne'] to project['netenv']

• Modified NatGateway segments to aim references

Fixed

• Invariants were not being check for resources. Invariants need to be checked by the loader if they are not contained in a zope.schema.Object field, which will run the check behind the scenes.

4.0.0 (2019-08-21)

Added

• IVPCPeering and IVPCPeeringRoute have been added to the model for VPC Peering support.

• Added a CloudTrail schema configured in Resources/CloudTrail.yaml.

• IS3BucketPolicy now has principal and condition fields. principal can be either a Key-Value dictionary, where the key is either 'AWS', 'Service', etc. and the value can be either a String or a List. It is an alternate to the aws field, which will remain for setting simpler AWS-only principals. The condition field is a Key-Value dictionary of Key-Value filters.

• Alarm now has 'get_alarm_actions' and 'get_alarm_description' to help construct alarms.

• CloudTrail has a 'get_accounts' which will resolve the CloudTrail.accounts field to a list of Account objects in the model.

• IAlarm has description and runbook_url fields.

• CodePipeBuildDeploy.resolve_ref() function covers wider scope of ref lookups

• Added VPCPeering to the model.

• Added IElastiCache and IElastiCacheRedis to the model.

Changed

• MonitorConfig/LogSets.yaml has been renamed to MonitorConfig/Logging.yaml. CloudWatch logging is under the top level cw_logging key. The schema has been completely reworked so that LogGroups and LogSets are properly modelled.

• IAccount.region, IEC2KeyPair.region and ICredentials.aws_default_region no longer have us-west-2 as a default. The region needs to be explicity set.

Fixed

• IAlarm.classification is now a required field.

3.1.0 (2019-08-08)

Added

• aim-project-version.txt file in the root directory can now contain the AIM Project YAML version. IProject now has an paco_project_version field to store this value.

• ICloudWatchAlarm gets a namespace field. Can be used to override the default Resource namespace, for example, use 'CWAgent' for the CloudWatch agent metrics.

• IResource now has a resource_fullname field. The fullname is the name needed to specify for a metric in a CloudWatch Alarm.

• ICloudWatchAlarm now has a dimensions field, which is a List of Dimension objects.

• ITargetGroup now inherits from IResource. It loads resource_name from outputs.

3.0.0 (2019-08-06)

Added

• New MonitorConfig/NotificationGroups.yaml that contains subscription groups for notifications.

• sdb_cache field for Lambda.

• Lambda can have alarms.

• ISNSTopic and ISNSTopicSubscription to model SNS.

Changed

• All references have been renamed to start with paco.ref for consistency.

• AlarmSets, AlarmSet and Alarm all now implement INamed and are locatable in the model

• Service plugins can load their outputs

2.0.0 (2019-07-23)

Added

• Schema for Notifications for subscribing to Alarms

• Added S3Resource for Resources/S3.yml configuration

• Added Lambda resolve_ref support

Changed

• Services are loaded as entry_point plugins named paco.services

• Refactored the models applications, resources, and services.

• Renamed IRoute53 to IRoute53Resource.

Fixed

• CloudWatchAlarms now validate a classification field value of 'performance', 'health' or 'security' is supplied.

1.1.0 (2019-07-06)

Added

• Added function.ref to be able to look-up latest AMI IDs

• Added more constraints to the schemas.

• Added default to IS3Bucket.policy

• Added Route53 to schema and model

• Added redirect to Listner rules in the ALB

Changed

• Description attribute for Fields is now used to describe constraints.

• Ported CodeCommit to schema and model

• Refactored S3 to use Application StackGroup

• CPBD artifacts s3 bucket now uses S3 Resource in NetEnv yaml instead

• Converted the ALB's listener and listener rules to dicts from lists

Removed

• Removed unused yaml config from pacodemo under fixtures.

1.0.1 (2019-06-19)

• Improvements to Python packaging metadata.

1.0.0 (2019-06-19)

• First open source release