We will use the Pub/Sub Golang library, which uses a persistent TCP connection under the covers.
google_pubsub: a A new table for adding Pub/Sub connection details and topics
name: string String column PK
system_key: string String column
project_id: string String column
credentials: string String column (encryptedEncrypted. Will contain the credentials JSON file)
topics: jsonb JSONB column (array of 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. We will use Use the Publish function to forward messages.
...
| Code Block |
|---|
{
"credentials_map": { // thisThis is the service account jsonJSON 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 iotIoT coreCore topic
{"path": "/devices/+/events", "type": 1, "target": "performance-testing"}, // iotIoT coreCore 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"} // iotIoT coreCore 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.
...