Context attributes in events for event engine

[ITD27M01]

We use the event engine for managing DNS records with Designate service. To create "PTR" records for each "A" record, the following event trigger used:

{
  "Workflow ID": "feb60678-669f-458f-bca0-ea39dd7bdb8a",
  "Exchange": "designate",
  "Event": "dns.recordset.create",
  "Topic": "notifications",
  "Params": "{}",
  "Updated at": null,
  "ID": "414be2c6-b692-42b9-a745-842955a54138",
  "Created at": "2019-12-18 16:42:16",
  "Name": "cloud.events.dns.create_ptr"
}

Here is an example of event_definitions.yaml for such events:

cat /etc/mistral/event_definitions.yaml
- event_types:
    - dns.*
  properties:
    event: <% $ %>
    project_id: <% $.context.project %>
    user_id: <% $.context.user %>

The problem is context from service has attributes <user> and <project> but not <user_id> and <project_id> [1], [2], [3]. Here is an example of an event:

        "event": {
            "publisher": "central.172.30.0.134",
            "context": {
                "domain": null,
                "project_domain": null,
                "auth_token": "gAAAAABd_Jfa9ELieG6_mXivzbdkTqaprOKRzAXYvQH0NXyD8AKfbqJ22ppjtTHg26wrln8TCLJWscHsv8YowSfQl70Fs9NBSdgrCqJ-BFTTqvDMPfLXLWnLcevK4CCrPWW7dsKllRGvs3KqWkQSnVBtoDj4Wy6QZKuIKtKJIPMgv35Su70-pmSg5VUCkkVHLqVcfOT1wx4z",
                "resource_uuid": null,
                "original_tenant": null,
                "read_only": false,
                "system_scope": null,
                "user_identity": "ad64ce5e9890b9596163edd10c8a4da2bca62c4f84f720b59cf30d20903c60ab 975d866668854d14b6cb37d6a9780172 - - -",
                "is_admin_project": true,
                "hide_counts": false,
                "client_timeout": null,
                "global_request_id": null,
                "is_admin": false,
                "user": "ad64ce5e9890b9596163edd10c8a4da2bca62c4f84f720b59cf30d20903c60ab",
                "service_catalog": []
                "tsigkey_id": null,
                "all_tenants": false,
                "tenant": "975d866668854d14b6cb37d6a9780172",
                "show_deleted": false,
                "roles": [
                    "admin"
                ],
                "edit_managed_records": false,
                "client_addr": "172.30.44.64",
                "project": "975d866668854d14b6cb37d6a9780172",
                "request_id": "req-a272bad3-8621-401f-9584-11f7dcfb715c",
                "abandon": null,
                "user_domain": null
            },
            "event_type": "dns.recordset.create",
            "timestamp": "2019-12-20 09:43:59.434517",
            "payload": {
                "zone_id": "70a6c3e9-fbd7-4b9a-beb5-841046754de3",
                "tenant_id": "975d866668854d14b6cb37d6a9780172",
                "created_at": "2019-12-20T09:43:59.393688",
                "description": "None",
                "updated_at": null,
                "records": [
                    {
                        "status": "PENDING",
                        "zone_id": "70a6c3e9-fbd7-4b9a-beb5-841046754de3",
                        "managed": false,
                        "managed_resource_id": null,
                        "managed_resource_type": null,
                        "tenant_id": "975d866668854d14b6cb37d6a9780172",
                        "created_at": "2019-12-20T09:43:59.405292",
                        "managed_extra": null,
                        "updated_at": null,
                        "managed_plugin_type": null,
                        "version": 1,
                        "managed_plugin_name": null,
                        "managed_tenant_id": null,
                        "action": "CREATE",
                        "hash": "0ee96e7ffa25e0a81485d7200bc55e11",
                        "managed_resource_region": null,
                        "recordset_id": "440305dc-f31a-4c0e-abbb-e626f3beec5b",
                        "data": "srv8-jobscdc.delivery.cloud",
                        "id": "2d0acbcb-b5f6-4a10-adee-b8c5c7b1b02b",
                        "serial": 1576835039,
                        "description": null
                    }
                ],
                "version": 1,
                "ttl": null,
                "zone_name": "176.30.172.in-addr.arpa.",
                "type": "PTR",
                "id": "440305dc-f31a-4c0e-abbb-e626f3beec5b",
                "name": "213.176.30.172.in-addr.arpa."
            }
        }

As a result, the trigger cannot start the workflow because default_event_engine cannot match the context with the event trigger owner.

[1] https://github.com/openstack/mistral/blob/master/mistral/event_engine/default_event_engine.py#L295
[2] https://github.com/openstack/mistral/blob/master/mistral/event_engine/default_event_engine.py#L44
[3] https://github.com/openstack/mistral/blob/master/mistral/event_engine/default_event_engine.py#L45

[ITD27M01 (igortiunov)]

The example context for compute.instance.create.end event (both project and project_id are present):

        "context": {
            "domain": null,
            "project_domain": "95ab4645f0764ac782765cbdcc79bbff",
            "auth_token": "",
            "resource_uuid": null,
            "read_only": false,
            "user_id": "bbe117ded750704ba460feaabff6190c6b07c9acabc91066878cfca0c8362f48",
            "system_scope": null,
            "user_identity": "bbe117ded750704ba460feaabff6190c6b07c9acabc91066878cfca0c8362f48 40e5d3f91fb44ccaa9056252efc243a7 - 95ab4645f0764ac782765cbdcc79bbff 95ab4645f0764ac782765cbdcc79bbff",
            "is_admin_project": true,
            "tenant": "40e5d3f91fb44ccaa9056252efc243a7",
            "project_id": "40e5d3f91fb44ccaa9056252efc243a7",
            "user_name": "my_user",
            "client_timeout": null,
            "project_name": "my_project",
            "global_request_id": null,
            "timestamp": "2020-03-16T07:58:10.676305",
            "remote_address": "172.30.202.28",
            "quota_class": null,
            "is_admin": false,
            "user": "bbe117ded750704ba460feaabff6190c6b07c9acabc91066878cfca0c8362f48",
            "service_catalog": [
            ],
            "read_deleted": "no",
            "show_deleted": false,
            "roles": [
                "user"
            ],
            "project": "40e5d3f91fb44ccaa9056252efc243a7",
            "request_id": "req-80c91d5b-2b22-4aca-800e-e27cf65949f1",
            "user_domain": "95ab4645f0764ac782765cbdcc79bbff"
        }