CBA

The Controller Blueprint Archived is the overall service design, fully model-driven, package needed to automate the instantiation and any config provisioning operation, such as day0 or day2 configuration.

The CBA is .zip file, comprised of the following structure:

.
├── Definitions
│   ├── blueprint.json
│   ├── artifact_types.json
│   ├── data_types.json
│   ├── node_types.json
│   ├── policy_types.json
│   ├── relationship_types.json
│   ├── resources_definition_types.json
│   └── *-mapping.json
├── Plans
│   ├── ResourceAssignment.xml
│   ├── ConfigAssign.xml
│   └── ConfigDeploy.xml
├── Scripts
│   └── python
│

-------------------- To be finished --------------------

This guide is geared to provide information regarding  how to do service design to automate instantiation and day0 configuration.

Installation

ONAP is meant to be deployed within a Kubernetes environment. Hence, the de-facto way to deploy CDS is through Kubernetes.

ONAP also package Kubernetes manifest as Chart, using Helm.

Prerequisite

https://docs.onap.org/en/latest/guides/onap-developer/settingup/index.html

Setup local Helm

helm serve &
helm repo add local http://127.0.0.1:8879

Get the chart

Make sure to checkout the release to use, by replacing $release-tag in bellow command

git clone https://gerrit.onap.org/r/oom
git checkout tags/$release-tag
cd oom/kubernetes
make cds

Install CDS

helm install --name cds cds

Result

       ├── ConfigDeployExample.py
│       ├── ResourceResolutionExample.py
│   

└── __init__.py
├── TOSCA-Metadata
│   

└── 

TOSCA.meta
└── Templates
    

└── *-template.vtl

Data Dictionary

A data dictionary defines a specifc resource that can be resolved using the bellow the supported sources.

A data dictionary can support multiple resources.

The main goal of data dictionary is to define generic entity that could be shared accross the service catalog.

Resolution sources

Input

Default

SQL

Default (SDNC DB)

Generic

REST

Default (SDNC MDSAL)

Generic

Capability (scripts)

Python

Kotlin script

Netconf (through Python)

Workflow

A workflow defines an overall action to be taken for the service; it can be composed of a set of node to execute. Currently, workflows are backed by Directed Graph engine.

A CBA can have as many workflow as needed.

Required workflows

The following workflows are contracts being established between SO, SDNC and CDS to cover the instantiation and the post-instantiation use cases.

resource-assignment

This action is meant to assign resources needed to instantiate the service. The goal is to resolved all the HEAT environment variables.

This action is triggered by Generic-Resource-API (GR-API) within SDNC as part of the AssignBB orchestrated by SO. Hence it will be triggered for each VNF(s) and VF-Module(s).

In order to know what to resolved, one input is required, that is the artifact prefix (see bellow for explanation).

artifacts

For each VNF and VF-Module comprising the service, a combinaison of a template and mapping is needed.

The requirement is as follow for VNF:

${vnf-name}-template
${vnf-name}-mapping

and as follow for VF-Module, where the vf-module-label is actually the name of the HEAT template file.

${vf-module-label}-template
${vf-module-label}-mapping

${vnf-name} and ${vf-module-label} is what we call the artifact prefix, so the requirement could be seen as follow:

${artifact-prefix}-template
${artifact-prefix}-mapping

template

The template has to be a resource accumulator template; that be composed of the following sections:

• resource-accumulator-resolved-data: defines all the resources that can be resolved directly from the context. It expresses a direct mapping between the name of the resource and its value.

  Code Block
  title RA resolved data collapse true
  "resource-accumulator-resolved-data": [ { "param-name": "service-instance-id", "param-value": "${service-instance-id}" }, { "param-name": "vnf_id", "param-value": "${vnf-id}" } ]

  
  

• capability-data: defines what capability to use to create a specific resource, along with the ingredients required to invoke the capability and the output mapping.

  Code Block
  title RA capability payload collapse true
  { "capability-name": "netbox-ip-assign", "key-mapping": [ { "payload": [ {

...

...

Design time

Bellow are the requirements to enable automation for a service within ONAP.

For instantiation, the goal is to be able to automatically resolve all the HEAT/Helm variables, called cloud parameters.

For post-instantiation, the goal is to configure the VNF with initial configuration.

...

...

Prerequisite

Gather the cloud parameters:

...

...

Create and fill-in the a table for all the dynamic values

While doing so, identify the resources using the same process to be resolved; for instance, if two IPs has to be resolved through the same IPAM, the process the resolve the IP is the same.

...

Here are the information to capture for each dynamic cloud parameters

...

...

Value will be resolved by sending a query to the REST system

...

Supported Auth type

...

...

Value will be resolved by sending a SQL statement to the DB system

...

jdbc:mysql://<host>:<port>/db

...

These are all the required parameters to process the resolution of that particular resources.

...

...

This is the expected result from the system, and you should know what value out of the response is of interest for you.

If it's a JSON payload, then you should think about the json path to access to value of interest.

...

Data dictionary

What is a data dictionary?

For each unique identified dynamic resource, along with all their ingredients, we need to create a data dictionary.

Here are the modeling guideline: Modeling Concepts#resourceDefinition-modeling

Bellow are examples of data dictionary

...

...

Value will be pass as input.

{
    "tags": "unit-number",
    "name": "unit-number",
    "property": {
      "description": "unit-number",
      "type": "string"
    },
    "updated-by": "adetalhouet",
    "sources": {
      "input": {
        "type": "source-input"
      }
    }
  }

...

Value will be defaulted.

{
  "tags": "prefix-id",
  "name": "prefix-id",
  "property" :{
    "description": "prefix-id",
    "type": "integer"
  },
  "updated-by": "adetalhouet",
  "sources": {
    "default": {
      "type": "source-default"
    }
  }
}

...

Value will be resolved through REST.

Modeling reference: Modeling Concepts#rest

...

In this example, we're making a POST request to an IPAM system with no payload.

Some ingredients are required to perform the query, in this case, $prefixId. Hence It is provided as an input-key-mapping and defined as a key-dependencies. Please refer to the modeling guideline for more in depth understanding.

As part of this request, the expected response will be as bellow. What is of interest is the address field, as this is what we're trying to resolve.

{
    "id": 4,
    "address": "192.168.10.2/32",
    "vrf": null,
    "tenant": null,
    "status": 1,
    "role": null,
    "interface": null,
    "description": "",
    "nat_inside": null,
    "created": "2018-08-30",
    "last_updated": "2018-08-30T14:59:05.277820Z"
}

To tell the resolution framework what is of interest in the response, the path property can be used, which uses JSON_PATH, to get the value.

{
    "tags" : "oam-local-ipv4-address",
    "name" : "create_netbox_ip",
    "property" : {
      "description" : "netbox ip",
      "type" : "string"
    },
    "updated-by" : "adetalhouet",
    "sources" : {
      "primary-config-data" : {
        "type" : "source-rest",
        "properties" : {
          "type" : "JSON",
          "verb" : "POST",
          "endpoint-selector" : "ipam-1",
          "url-path" : "/api/ipam/prefixes/$prefixId/available-ips/",
          "path" : "/address",
          "input-key-mapping" : {
            "prefixId" : "prefix-id"
          },
          "output-key-mapping" : {
            "address" : "address"
          },
          "key-dependencies" : [ "prefix-id" ]
        }
      }
    }
  }

...

primary-aai-data via type source-rest

TBD

{
  "name" : "primary-aai-data",
  "tags" : "primary-aai-data",
  "updated-by" : "Steve, Siani <steve.djissitchi@bell.ca>",
  "property" : {
    "description" : "primary-aai-data",
    "type" : "string"
  },
  "sources" : {
    "default": {
      "type": "source-default",
      "properties": {
      }
    },
    "input": {
      "type": "source-input",
      "properties": {
      }
    },
    "primary-aai-data" : {
      "type" : "source-rest",
      "properties": {
        "type": "JSON",
        "url-path": "$aai-port/aai/v14/network/generic-vnfs/generic-vnf/$vnf-id",
        "path": "",
        "input-key-mapping": {
          "aai-port": "port",
          "vnf-id": "vnf-id"
        },
        "output-key-mapping": {
        },
        "key-dependencies": [
          "port",
          "vnf-id"
        ]
      }
    }
  }
}

...

Value will be resolved through a database.

Modeling reference: Modeling Concepts#sql

In this example, we're making a SQL to the primary database.

Some ingredients are required to perform the query, in this case, $vfmoudleid. Hence It is provided as an input-key-mapping and defined as a key-dependencies. Please refer to the modeling guideline for more in depth understanding.

As part of this request, the expected response will be as put in value. In the output-key-mapping section, that value will be mapped to the expected resource name to resolve.

{
  "name": "vf-module-type",
  "tags": "vf-module-type",
  "property": {
    "description": "vf-module-type",
    "type": "string"
  },
  "updated-by": "adetalhouet",
  "sources": {
    "primary-db": {
      "type": "source-primary-db",
      "properties": {
        "type": "SQL",
        "query": "select sdnctl.demo.value as value from sdnctl.demo where sdnctl.demo.id=:vfmoduleid",
        "input-key-mapping": {
          "vfmoduleid": "vf-module-number"
        },
        "output-key-mapping": {
          "vf-module-type": "value"
        },
        "key-dependencies": [
          "vf-module-number"
        ]
      }
    }
  }
}

...

Value will be resolved through the execution of a script.

Modeling reference: Modeling Concepts#Capability

In this example, we're making use of a Python script.

Some ingredients are required to perform the query, in this case, $vf-module-type. Hence It is provided as a key-dependencies. Please refer to the modeling guideline for more in depth understanding.

As part of this request, the expected response will set within the script itself.

{
  "tags": "interface-description",
  "name": "interface-description",
  "property": {
    "description": "interface-description",
    "type": "string"
  },
  "updated-by": "adetalhouet",
  "sources": {
    "capability": {
      "type": "source-capability",
      "properties": {
        "script-type": "jython",
        "script-class-reference": "Scripts/python/DescriptionExample.py",
        "instance-dependencies": [],
        "key-dependencies": [
          "vf-module-type"
        ]
      }
    }
  }
}

The script itself is as bellow.

The key is to have the script class derived from the framework standards.

In the case of resource resolution, the class to derive from is AbstractRAProcessor

It will give the required methods to implement: process and recover, along with some utility functions, such as set_resource_data_value or addError.

These functions either come from the AbstractRAProcessor class, or from the class it derived from.

If the resolution fail, the recover method will get called with the exception as parameter.

#  Copyright (c) 2019 Bell Canada.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

from abstract_ra_processor import AbstractRAProcessor
from blueprint_constants import *
from java.lang import Exception as JavaException

class DescriptionExample(AbstractRAProcessor):

    def process(self, resource_assignment):
        try:
            # get key-dependencies value
            value = self.raRuntimeService.getStringFromResolutionStore("vf-module-type")
            
            # logic based on key-dependency outcome
            result = ""
            if value == "vfw":
                result = "This is the Virtual Firewall entity"
            elif value == "vsn":
                result = "This is the Virtual Sink entity"
            elif value == "vpg":
                result = "This is the Virtual Packet Generator"

            # set the value of resource getting currently resolved
            self.set_resource_data_value(resource_assignment, result)

        except JavaException, err:
          log.error("Java Exception in the script {}", err)
        except Exception, err:
          log.error("Python Exception in the script {}", err)
        return None

    def recover(self, runtime_exception, resource_assignment):
        print self.addError(runtime_exception.getMessage())
        return None

...

Value will be resolved through REST., and output will be a complex type.

Modeling reference: Modeling Concepts#rest

In this example, we're making a POST request to an IPAM system with no payload.

Some ingredients are required to perform the query, in this case, $prefixId. Hence It is provided as an input-key-mapping and defined as a key-dependencies. Please refer to the modeling guideline for more in depth understanding.

As part of this request, the expected response will be as bellow.

{
    "id": 4,
    "address": "192.168.10.2/32",
    "vrf": null,
    "tenant": null,
    "status": 1,
    "role": null,
    "interface": null,
    "description": "",
    "nat_inside": null,
    "created": "2018-08-30",
    "last_updated": "2018-08-30T14:59:05.277820Z"
}

What is of interest is the address and id fields. For the process to return these two values, we need to create a custom data-type, as bellow

{
  "version": "1.0.0",
  "description": "This is Netbox IP Data Type",
  "properties": {
    "address": {
      "required": true,
      "type": "string"
    },
    "id": {
      "required": true,
      "type": "integer"
    }
  },
  "derived_from": "tosca.datatypes.Root"
}

The type of the data dictionary will be dt-netbox-ip.

To tell the resolution framework what is of interest in the response, the output-key-mapping section is used. The process will map the output-key-mapping to the defined data-type.

{
    "tags" : "oam-local-ipv4-address",
    "name" : "create_netbox_ip",
    "property" : {
      "description" : "netbox ip",
      "type" : "dt-netbox-ip"
    },
    "updated-by" : "adetalhouet",
    "sources" : {
      "primary-config-data" : {
        "type" : "source-rest",
        "properties" : {
          "type" : "JSON",
          "verb" : "POST",
          "endpoint-selector" : "ipam-1",
          "url-path" : "/api/ipam/prefixes/$prefixId/available-ips/",
          "path" : "",
          "input-key-mapping" : {
            "prefixId" : "prefix-id"
          },
          "output-key-mapping" : {
			"address" : "address",
            "id" : "id"
          },
          "key-dependencies" : [ "prefix-id" ]
        }
      }
    }
  }

...

Workflows

The following workflows are contracts established between SO, SDNC and CDS to cover the instantiation and the post-instantiation use cases.

Please refer to the modeling guide to understand workflow concept: Modeling Concepts#workflow

...

...

resource-assignment

This action is meant to assign resources needed to instantiate the service, e.g. to resolve all the cloud parameters.

Also, this action has the ability to perform a dry-run, meaning that result from the resolution will be made visible to the user.

If user is fine with the result, he can proceed, else, (TDB) he will have opportunity to re-trigger the resolution.

Context

This action is triggered by Generic-Resource-API (GR-API) within SDNC as part of the AssignBB orchestrated by SO.

It will be triggered for the service, and each VNF(s) and VF-Module(s) (referred as entity bellow).

See SO Building blocks Assignment.

Steps

This is a single action type of workflow, hence the target will refer to a node_template of type component-resource-resolution

Inputs

...

These templates are identified using artifact prefix. See Modeling Concepts#template

So in order to know for which entity the action is triggered, this is required as input is required.

...

The dry-run functionality requires the ability to retrieve the resolution that has been made later point in time in the process.

The combination of the artifact-name and the resolution-key will be used to uniquely identify the result.

Output

In order to perform dry-run, it is necessary to provide the meshed resolved template as output. To do so, the use of Modeling Concepts#getAttribute expression is required.

Also, as mentioned here Modeling Concepts#resourceResolution, the resource resolution component node will populate an attribute named assignment-params with the result.

Finally, the name of the ouput has to be meshed-template so SDNC GR-API knows how to properly parse the response.

Example

Here is an example of the resource-assignment workflow:

{
  "workflows": {
    "resource-assignment": {
      "steps": {
        "resource-assignment-process": {
          "description": "Resource Assign Workflow",
          "target": "resource-assignment-process"
        }
      },
      "inputs": {
        "artifact-name": {
          "required": true,
          "type": "string"
        },
        "resolution-key": {
          "required": true,
          "type": "string"
        },
        "resource-assignment-properties": {
          "description": "Dynamic PropertyDefinition for workflow(resource-assignment).",
          "required": true,
          "type": "dt-resource-assignment-properties"
        }
      },
      "outputs": {
        "meshed-template": {
          "type": "json",
          "value": {
            "get_attribute": [
              "SELF",
              "assignment-params"
            ]
          }
        }
      }
    }
  }
}

...

config-assign

This action is meant to assign all the resources and mesh the templates needed for the configuration to apply during post-instantiation (day0 config).

If user is fine with the result, he can proceed, else, (TDB) he will have opportunity to re-trigger the resolution.

Context

This action is triggered by SO after the AssignBB has been executed for Service, VNF and VF-Module. It corresponds to the ConfigAssignBB.

See SO Building blocks Assignment.

Steps

This is a single action type of workflow, hence the target will refer to a node_template of type component-resource-resolution

Inputs

...

The dry-run functionality requires the ability to retrieve the resolution that has been made later point in time in the process.

The combination of the artifact-name and the resolution-key will be used to uniquely identify the result.

Output

In order to perform dry-run, it is necessary to provide the meshed resolved template as output. To do so, the use of Modeling Concepts#getAttribute expression is required.

Also, as mentioned here Modeling Concepts#resourceResolution, the resource resolution component node will populate an attribute named assignment-params with the result.

Example

Here is an example of the config-assign workflow:

{
  "workflows": {
    "config-assign": {
      "steps": {
        "config-assign-process": {
          "description": "Config Assign Workflow",
          "target": "config-assign-process"
        }
      },
      "inputs": {
        "resolution-key": {
          "required": true,
          "type": "string"
        },
        "config-assign-properties": {
          "description": "Dynamic PropertyDefinition for workflow(config-assign).",
          "required": true,
          "type": "dt-config-assign-properties"
        }
      },
      "outputs": {
        "dry-run": {
          "type": "json",
          "value": {
            "get_attribute": [
              "SELF",
              "assignment-params"
            ]
          }
        }
      }
    }
  }
}

...

config-deploy

This action is meant to push the configuration templates defined during the config-assign step for the post-instantiation.

This action is triggered by SO during after the CreateBB has been executed for all the VF-Modules.

Context

This action is triggered by SO after the CreateVnfBB has been executed. It corresponds to the ConfigDeployBB.

See SO Building blocks Assignment.

Steps

This is a single action type of workflow, hence the target will refer to a node_template of type component-netconf-executor or component-jython-executor or component-restconf-executor.

Inputs

...

Needed to retrieve the resolution that has been made earlier point in time in the process.

The combination of the artifact-name and the resolution-key will be used to uniquely identify the result.

Output

SUCCESS or FAILURE

Example

Here is an example of the config-deploy workflow:

...

...

• "param-name": "service-instance-id", "param-value": "${service-instance-id}" }, { "param-name": "prefix-id", "param-value": "${private-prefix-id}" }, { "

...

• param-name": "

...

• vf-module-id",

...

• "

...

• param-value": "

...

• ${vf-

...

• module-

...

• id}" },

...

...

• {

...

• "param-name":

...

• "external_key",

...

• "param-value":

...

• "${vf-module-id}-vpg_private_ip_1"

...

• }

...

• ], "

...

• output-

...

• key-

...

• mapping":

...

• [

...

• { "

...

• resource-name":

...

• "vpg_private_ip_1",

...

• "resource-value": "

...

• ${vpg_private_ip_1}" }

...

• ] }

...

• ] }

  
  

mapping

Defines the contract of each resource to be resolved. Each placeholder in the template must have a corresponding mapping definition.

A mapping is comprised of:

• name
• required / optional
• type (support complex type)
• dictionary-name
• dictionary-source
• dependencies: this allows to make sure given resources get resolved prior the resolution of the resources defining the dependency.

The dictionary fields reference to a specific data dictionary.

scripts

If any of the mapping uses a source capabbility to resolve a parameters.

config-assign

This action is meant to assign all the resources and mesh the templates needed for the configuration to apply post-instantiation.

This action is triggered by SO during after the AssignBB has been executed for Service, VNF and VF-Module.

artifacts

Combinaison of templates with respective mappings

Scripts if needed

config-deploy

This action is meant to push the configuration templates defined during the config-assign step for the post-instantiation.

This action is triggered by SO during after the CreateBB has been executed for all the VF-Modules.

artifacts

Combinaison of templates with respective mappings

Scripts using Netconf or Restconf to push configure the network element.

...

...

...

...

...

...