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85ea1a5d64
Re-adding back Azure authentication support to Prometheus datasource after the datasource query logic was rewritten from plugin.json routes to Go backend. Ref #35857
121 lines
3.1 KiB
Go
121 lines
3.1 KiB
Go
package prometheus
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"regexp"
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"github.com/grafana/grafana/pkg/tsdb/prometheus/promclient"
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"github.com/grafana/grafana-plugin-sdk-go/backend"
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"github.com/grafana/grafana-plugin-sdk-go/backend/datasource"
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"github.com/grafana/grafana-plugin-sdk-go/backend/instancemgmt"
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"github.com/grafana/grafana/pkg/infra/httpclient"
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"github.com/grafana/grafana/pkg/infra/log"
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"github.com/grafana/grafana/pkg/infra/tracing"
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"github.com/grafana/grafana/pkg/tsdb/intervalv2"
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"github.com/grafana/grafana/pkg/util/maputil"
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apiv1 "github.com/prometheus/client_golang/api/prometheus/v1"
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)
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var (
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plog = log.New("tsdb.prometheus")
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legendFormat = regexp.MustCompile(`\{\{\s*(.+?)\s*\}\}`)
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safeRes = 11000
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)
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type Service struct {
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intervalCalculator intervalv2.Calculator
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im instancemgmt.InstanceManager
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tracer tracing.Tracer
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}
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func ProvideService(httpClientProvider httpclient.Provider, tracer tracing.Tracer) *Service {
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plog.Debug("initializing")
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return &Service{
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intervalCalculator: intervalv2.NewCalculator(),
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im: datasource.NewInstanceManager(newInstanceSettings(httpClientProvider)),
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tracer: tracer,
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}
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}
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func newInstanceSettings(httpClientProvider httpclient.Provider) datasource.InstanceFactoryFunc {
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return func(settings backend.DataSourceInstanceSettings) (instancemgmt.Instance, error) {
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var jsonData map[string]interface{}
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err := json.Unmarshal(settings.JSONData, &jsonData)
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if err != nil {
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return nil, fmt.Errorf("error reading settings: %w", err)
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}
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p := promclient.NewProvider(settings, jsonData, httpClientProvider, plog)
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pc, err := promclient.NewProviderCache(p)
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if err != nil {
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return nil, err
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}
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timeInterval, err := maputil.GetStringOptional(jsonData, "timeInterval")
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if err != nil {
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return nil, err
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}
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mdl := DatasourceInfo{
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ID: settings.ID,
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URL: settings.URL,
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TimeInterval: timeInterval,
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getClient: pc.GetClient,
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}
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return mdl, nil
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}
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}
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func (s *Service) QueryData(ctx context.Context, req *backend.QueryDataRequest) (*backend.QueryDataResponse, error) {
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if len(req.Queries) == 0 {
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return &backend.QueryDataResponse{}, fmt.Errorf("query contains no queries")
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}
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q := req.Queries[0]
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dsInfo, err := s.getDSInfo(req.PluginContext)
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if err != nil {
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return nil, err
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}
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var result *backend.QueryDataResponse
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switch q.QueryType {
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case "timeSeriesQuery":
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fallthrough
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default:
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result, err = s.executeTimeSeriesQuery(ctx, req, dsInfo)
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}
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return result, err
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}
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func (s *Service) getDSInfo(pluginCtx backend.PluginContext) (*DatasourceInfo, error) {
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i, err := s.im.Get(pluginCtx)
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if err != nil {
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return nil, err
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}
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instance := i.(DatasourceInfo)
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return &instance, nil
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}
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// IsAPIError returns whether err is or wraps a Prometheus error.
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func IsAPIError(err error) bool {
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// Check if the right error type is in err's chain.
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var e *apiv1.Error
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return errors.As(err, &e)
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}
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func ConvertAPIError(err error) error {
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var e *apiv1.Error
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if errors.As(err, &e) {
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return fmt.Errorf("%s: %s", e.Msg, e.Detail)
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}
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return err
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}
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