This plugin implements emitter.io Metering interface. The usage statistics are written to Google Datastore as descendants of contract kind, in MM/YYYY format. The counters are incremented using Google Datastore transactions which allows multiple brokers increment counters concurrently. Note that this is intended for demonstration purposes and has not yet been tested in production.
In order to use this plugin, you'd need to first build it (go build -buildmode=plugin) after this, launch the broker and point metering provider to the .so file generated, as in the example below.
{
"listen": ":8080",
"license": "....",
"cluster": {
"name": "00:00:00:00:00:01",
"listen": ":4000",
"advertise": "127.0.0.1:4000",
"passphrase": "emitter-io"
},
"metering": {
"provider": "/mnt/d/Workspace/Go/src/github.com/kelindar/plugins/metering/metering.so",
"config": {
"type": "service_account",
"project_id": "your project",
"private_key_id": "....",
"private_key": "-----BEGIN PRIVATE KEY-----.....",
"client_email": ".....@appspot.gserviceaccount.com",
"client_id": ".....",
"auth_uri": "https://accounts.google.com/o/oauth2/auth",
"token_uri": "https://accounts.google.com/o/oauth2/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/emitter-io%40appspot.gserviceaccount.com"
}
}
}
The config is actually Google Serivice Account credentials JSON file. The plugin will copy this in a separate creds.json file and provide it to the Google Cloud client internally. For more info, see: https://developers.google.com/identity/protocols/application-default-credentials.