We will use the Pub/Sub Golang library, which uses a persistent TCP connection under the covers.
google_pubsub: A new table for adding Pub/Sub connection details and topics
name: String column PK
system_key: String column
project_id: String column
credentials: String column (Encrypted. Will contain the credentials JSON file)
topics: JSONB column (Pub/Sub topics array)
There will be endpoints for CRUD (details will be added later).
The topics entered during Pub/Sub connection creation will be added as subscribers to the topic tree. The Pub/Sub connection will implement the client interface in core_messaging/broker/client_manager.go. Use the Publish function to forward messages.
Endpoints:
/admin/{systemKey}/{name}/google-integrations/pub-sub
GET, POST, PUT, and DELETE support
POST:
Body required. The body can have IoT Core and non-IoT Core topics. type and target are required for IoT Core topics. type can be 1 for events and 2 for state:
{
"credentials_map": { // This is the service account JSON object
"type": "service_account",
"project_id": "myprojectid",
"private_key_id": "blahblahblah",
"private_key": "<priv_key>",
"client_email": "a@a.com",
"client_id": "9126871624161341",
"auth_uri": "https://accounts.google.com/o/oauth2/auth",
"token_uri": "https://oauth2.googleapis.com/token",
"auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
"client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/dahjkdhajkd%40dajsdgajdadsad.iam.gserviceaccount.com"
},
"project_id": "myprojectid",
"topics": [
{"path": "iotdemo"}, // Non IoT Core topic
{"path": "/devices/+/events", "type": 1, "target": "performance-testing"}, // IoT Core topic
{"path": "/devices/+/events/sub", "type": 1, "target": "performance-testing-sub", "sub_folder": "sub"}, // iot core topic
{"path": "/devices/+/state", "type": 2, "target": "performance-testing-state"} // IoT Core topic
]
}
path is the topic the Pub/Sub client will subscribe to internally to the ClearBlade broker. type is the topic type. No type represents a non-IoT Core topic. 1 is for event and 2 is for state. target is the topic the Pub/Sub client will publish to in Pub/Sub. sub_folder is for the event's topic if it has a subfolder.
GET:
No query support. Admin or Dev.
Returns the same object as the POST body.
/admin/{systemKey}/google-integrations/pub-sub
GET and DELETE support only. GET obtains all Pub/Sub connections for that system, and DELETE deletes all.