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datasources.go
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/
datasources.go
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package datasources
import (
"errors"
"github.com/grafana/grafana/pkg/bus"
"github.com/grafana/grafana/pkg/log"
"github.com/grafana/grafana/pkg/models"
)
var (
ErrInvalidConfigToManyDefault = errors.New("datasource.yaml config is invalid. Only one datasource per organization can be marked as default")
)
func Provision(configDirectory string) error {
dc := newDatasourceProvisioner(log.New("provisioning.datasources"))
return dc.applyChanges(configDirectory)
}
type DatasourceProvisioner struct {
log log.Logger
cfgProvider *configReader
}
func newDatasourceProvisioner(log log.Logger) DatasourceProvisioner {
return DatasourceProvisioner{
log: log,
cfgProvider: &configReader{log: log},
}
}
func (dc *DatasourceProvisioner) apply(cfg *DatasourcesAsConfig) error {
if err := dc.deleteDatasources(cfg.DeleteDatasources); err != nil {
return err
}
for _, ds := range cfg.Datasources {
cmd := &models.GetDataSourceByNameQuery{OrgId: ds.OrgId, Name: ds.Name}
err := bus.Dispatch(cmd)
if err != nil && err != models.ErrDataSourceNotFound {
return err
}
if err == models.ErrDataSourceNotFound {
dc.log.Info("inserting datasource from configuration ", "name", ds.Name)
insertCmd := createInsertCommand(ds)
if err := bus.Dispatch(insertCmd); err != nil {
return err
}
} else {
dc.log.Debug("updating datasource from configuration", "name", ds.Name)
updateCmd := createUpdateCommand(ds, cmd.Result.Id)
if err := bus.Dispatch(updateCmd); err != nil {
return err
}
}
}
return nil
}
func (dc *DatasourceProvisioner) applyChanges(configPath string) error {
configs, err := dc.cfgProvider.readConfig(configPath)
if err != nil {
return err
}
for _, cfg := range configs {
if err := dc.apply(cfg); err != nil {
return err
}
}
return nil
}
func (dc *DatasourceProvisioner) deleteDatasources(dsToDelete []*DeleteDatasourceConfig) error {
for _, ds := range dsToDelete {
cmd := &models.DeleteDataSourceByNameCommand{OrgId: ds.OrgId, Name: ds.Name}
if err := bus.Dispatch(cmd); err != nil {
return err
}
if cmd.DeletedDatasourcesCount > 0 {
dc.log.Info("deleted datasource based on configuration", "name", ds.Name)
}
}
return nil
}