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datasource_plugin_wrapper.go
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/
datasource_plugin_wrapper.go
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package wrapper
import (
"context"
"errors"
"fmt"
"github.com/grafana/grafana/pkg/components/null"
"github.com/grafana/grafana/pkg/log"
"github.com/grafana/grafana/pkg/models"
"github.com/grafana/grafana/pkg/tsdb"
"github.com/grafana/grafana_plugin_model/go/datasource"
)
func NewDatasourcePluginWrapper(log log.Logger, plugin datasource.DatasourcePlugin) *DatasourcePluginWrapper {
return &DatasourcePluginWrapper{DatasourcePlugin: plugin, logger: log}
}
type DatasourcePluginWrapper struct {
datasource.DatasourcePlugin
logger log.Logger
}
func (tw *DatasourcePluginWrapper) Query(ctx context.Context, ds *models.DataSource, query *tsdb.TsdbQuery) (*tsdb.Response, error) {
jsonData, err := ds.JsonData.MarshalJSON()
if err != nil {
return nil, err
}
pbQuery := &datasource.DatasourceRequest{
Datasource: &datasource.DatasourceInfo{
Name: ds.Name,
Type: ds.Type,
Url: ds.Url,
Id: ds.Id,
OrgId: ds.OrgId,
JsonData: string(jsonData),
DecryptedSecureJsonData: ds.SecureJsonData.Decrypt(),
},
TimeRange: &datasource.TimeRange{
FromRaw: query.TimeRange.From,
ToRaw: query.TimeRange.To,
ToEpochMs: query.TimeRange.GetToAsMsEpoch(),
FromEpochMs: query.TimeRange.GetFromAsMsEpoch(),
},
Queries: []*datasource.Query{},
}
for _, q := range query.Queries {
modelJson, _ := q.Model.MarshalJSON()
pbQuery.Queries = append(pbQuery.Queries, &datasource.Query{
ModelJson: string(modelJson),
IntervalMs: q.IntervalMs,
RefId: q.RefId,
MaxDataPoints: q.MaxDataPoints,
})
}
pbres, err := tw.DatasourcePlugin.Query(ctx, pbQuery)
if err != nil {
return nil, err
}
res := &tsdb.Response{
Results: map[string]*tsdb.QueryResult{},
}
for _, r := range pbres.Results {
qr := &tsdb.QueryResult{
RefId: r.RefId,
Series: []*tsdb.TimeSeries{},
Tables: []*tsdb.Table{},
}
if r.Error != "" {
qr.Error = errors.New(r.Error)
qr.ErrorString = r.Error
}
for _, s := range r.GetSeries() {
points := tsdb.TimeSeriesPoints{}
for _, p := range s.Points {
po := tsdb.NewTimePoint(null.FloatFrom(p.Value), float64(p.Timestamp))
points = append(points, po)
}
qr.Series = append(qr.Series, &tsdb.TimeSeries{
Name: s.Name,
Tags: s.Tags,
Points: points,
})
}
mappedTables, err := tw.mapTables(r)
if err != nil {
return nil, err
}
qr.Tables = mappedTables
res.Results[r.RefId] = qr
}
return res, nil
}
func (tw *DatasourcePluginWrapper) mapTables(r *datasource.QueryResult) ([]*tsdb.Table, error) {
var tables []*tsdb.Table
for _, t := range r.GetTables() {
mappedTable, err := tw.mapTable(t)
if err != nil {
return nil, err
}
tables = append(tables, mappedTable)
}
return tables, nil
}
func (tw *DatasourcePluginWrapper) mapTable(t *datasource.Table) (*tsdb.Table, error) {
table := &tsdb.Table{}
for _, c := range t.GetColumns() {
table.Columns = append(table.Columns, tsdb.TableColumn{
Text: c.Name,
})
}
table.Rows = make([]tsdb.RowValues, 0)
for _, r := range t.GetRows() {
row := tsdb.RowValues{}
for _, rv := range r.Values {
mappedRw, err := tw.mapRowValue(rv)
if err != nil {
return nil, err
}
row = append(row, mappedRw)
}
table.Rows = append(table.Rows, row)
}
return table, nil
}
func (tw *DatasourcePluginWrapper) mapRowValue(rv *datasource.RowValue) (interface{}, error) {
switch rv.Kind {
case datasource.RowValue_TYPE_NULL:
return nil, nil
case datasource.RowValue_TYPE_INT64:
return rv.Int64Value, nil
case datasource.RowValue_TYPE_BOOL:
return rv.BoolValue, nil
case datasource.RowValue_TYPE_STRING:
return rv.StringValue, nil
case datasource.RowValue_TYPE_DOUBLE:
return rv.DoubleValue, nil
case datasource.RowValue_TYPE_BYTES:
return rv.BytesValue, nil
default:
return nil, fmt.Errorf("Unsupported row value %v from plugin", rv.Kind)
}
}