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datasource.go
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datasource.go
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package plugin
import (
"encoding/json"
"path"
"github.com/grafana/grafana-plugin-sdk-go/backend"
"github.com/grafana/grafana-plugin-sdk-go/backend/instancemgmt"
"github.com/ISSACS-PSG/mqtt-datasource/pkg/mqtt"
)
// Make sure MQTTDatasource implements required interfaces.
// This is important to do since otherwise we will only get a
// not implemented error response from plugin in runtime.
var (
_ backend.QueryDataHandler = (*MQTTDatasource)(nil)
_ backend.CheckHealthHandler = (*MQTTDatasource)(nil)
_ backend.StreamHandler = (*MQTTDatasource)(nil)
_ instancemgmt.InstanceDisposer = (*MQTTDatasource)(nil)
)
// NewMQTTDatasource creates a new datasource instance.
func NewMQTTInstance(s backend.DataSourceInstanceSettings) (instancemgmt.Instance, error) {
settings, err := getDatasourceSettings(s)
if err != nil {
return nil, err
}
client, err := mqtt.NewClient(*settings)
if err != nil {
return nil, err
}
return NewMQTTDatasource(client, s.UID), nil
}
type MQTTDatasource struct {
Client mqtt.Client
channelPrefix string
}
// NewMQTTDatasource creates a new datasource instance.
func NewMQTTDatasource(client mqtt.Client, uid string) *MQTTDatasource {
return &MQTTDatasource{
Client: client,
channelPrefix: path.Join("ds", uid),
}
}
// Dispose here tells plugin SDK that plugin wants to clean up resources
// when a new instance created. As soon as datasource settings change detected
// by SDK old datasource instance will be disposed and a new one will be created
// using NewMQTTDatasource factory function.
func (ds *MQTTDatasource) Dispose() {
ds.Client.Dispose()
}
func getDatasourceSettings(s backend.DataSourceInstanceSettings) (*mqtt.Options, error) {
settings := &mqtt.Options{}
if err := json.Unmarshal(s.JSONData, settings); err != nil {
return nil, err
}
if password, exists := s.DecryptedSecureJSONData["password"]; exists {
settings.Password = password
}
return settings, nil
}