mirror of
https://github.com/grafana/grafana.git
synced 2024-11-26 02:40:26 -06:00
375 lines
9.6 KiB
Go
375 lines
9.6 KiB
Go
package expr
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import (
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"context"
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"encoding/json"
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"fmt"
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"time"
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"github.com/grafana/grafana-plugin-sdk-go/backend"
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"github.com/grafana/grafana-plugin-sdk-go/data"
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"github.com/grafana/grafana/pkg/expr/classic"
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"github.com/grafana/grafana/pkg/expr/mathexp"
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"github.com/grafana/grafana/pkg/infra/log"
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"gonum.org/v1/gonum/graph/simple"
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)
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var (
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logger = log.New("expr")
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)
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// baseNode includes commmon properties used across DPNodes.
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type baseNode struct {
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id int64
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refID string
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}
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type rawNode struct {
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RefID string `json:"refId"`
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Query map[string]interface{}
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QueryType string
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TimeRange TimeRange
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DatasourceUID string
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}
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func (rn *rawNode) GetDatasourceName() (string, error) {
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rawDs, ok := rn.Query["datasource"]
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if !ok {
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return "", nil
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}
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dsName, ok := rawDs.(string)
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if !ok {
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return "", fmt.Errorf("expted datasource identifier to be a string, got %T", rawDs)
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}
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return dsName, nil
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}
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func (rn *rawNode) GetCommandType() (c CommandType, err error) {
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rawType, ok := rn.Query["type"]
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if !ok {
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return c, fmt.Errorf("no expression command type in query for refId %v", rn.RefID)
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}
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typeString, ok := rawType.(string)
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if !ok {
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return c, fmt.Errorf("expected expression command type to be a string, got type %T", rawType)
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}
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return ParseCommandType(typeString)
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}
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// String returns a string representation of the node. In particular for
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// %v formatting in error messages.
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func (b *baseNode) String() string {
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return b.refID
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}
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// CMDNode is a DPNode that holds an expression command.
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type CMDNode struct {
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baseNode
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CMDType CommandType
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Command Command
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}
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// ID returns the id of the node so it can fulfill the gonum's graph Node interface.
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func (b *baseNode) ID() int64 {
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return b.id
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}
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// RefID returns the refId of the node.
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func (b *baseNode) RefID() string {
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return b.refID
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}
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// NodeType returns the data pipeline node type.
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func (gn *CMDNode) NodeType() NodeType {
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return TypeCMDNode
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}
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// Execute runs the node and adds the results to vars. If the node requires
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// other nodes they must have already been executed and their results must
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// already by in vars.
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func (gn *CMDNode) Execute(ctx context.Context, vars mathexp.Vars, s *Service) (mathexp.Results, error) {
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return gn.Command.Execute(ctx, vars)
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}
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func buildCMDNode(dp *simple.DirectedGraph, rn *rawNode) (*CMDNode, error) {
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commandType, err := rn.GetCommandType()
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if err != nil {
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return nil, fmt.Errorf("invalid expression command type in '%v'", rn.RefID)
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}
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node := &CMDNode{
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baseNode: baseNode{
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id: dp.NewNode().ID(),
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refID: rn.RefID,
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},
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CMDType: commandType,
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}
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switch commandType {
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case TypeMath:
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node.Command, err = UnmarshalMathCommand(rn)
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case TypeReduce:
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node.Command, err = UnmarshalReduceCommand(rn)
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case TypeResample:
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node.Command, err = UnmarshalResampleCommand(rn)
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case TypeClassicConditions:
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node.Command, err = classic.UnmarshalConditionsCmd(rn.Query, rn.RefID)
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default:
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return nil, fmt.Errorf("expression command type '%v' in '%v' not implemented", commandType, rn.RefID)
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}
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if err != nil {
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return nil, err
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}
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return node, nil
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}
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const (
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defaultIntervalMS = int64(64)
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defaultMaxDP = int64(5000)
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)
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// DSNode is a DPNode that holds a datasource request.
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type DSNode struct {
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baseNode
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query json.RawMessage
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datasourceID int64
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datasourceUID string
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orgID int64
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queryType string
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timeRange TimeRange
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intervalMS int64
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maxDP int64
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}
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// NodeType returns the data pipeline node type.
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func (dn *DSNode) NodeType() NodeType {
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return TypeDatasourceNode
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}
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func (s *Service) buildDSNode(dp *simple.DirectedGraph, rn *rawNode, orgID int64) (*DSNode, error) {
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encodedQuery, err := json.Marshal(rn.Query)
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if err != nil {
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return nil, err
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}
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dsNode := &DSNode{
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baseNode: baseNode{
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id: dp.NewNode().ID(),
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refID: rn.RefID,
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},
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orgID: orgID,
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query: json.RawMessage(encodedQuery),
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queryType: rn.QueryType,
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intervalMS: defaultIntervalMS,
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maxDP: defaultMaxDP,
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timeRange: rn.TimeRange,
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}
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rawDsID, ok := rn.Query["datasourceId"]
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switch ok {
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case true:
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floatDsID, ok := rawDsID.(float64)
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if !ok {
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return nil, fmt.Errorf("expected datasourceId to be a float64, got type %T for refId %v", rawDsID, rn.RefID)
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}
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dsNode.datasourceID = int64(floatDsID)
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default:
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if rn.DatasourceUID == "" {
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return nil, fmt.Errorf("neither datasourceId or datasourceUid in expression data source request for refId %v", rn.RefID)
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}
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dsNode.datasourceUID = rn.DatasourceUID
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}
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var floatIntervalMS float64
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if rawIntervalMS := rn.Query["intervalMs"]; ok {
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if floatIntervalMS, ok = rawIntervalMS.(float64); !ok {
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return nil, fmt.Errorf("expected intervalMs to be an float64, got type %T for refId %v", rawIntervalMS, rn.RefID)
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}
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dsNode.intervalMS = int64(floatIntervalMS)
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}
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var floatMaxDP float64
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if rawMaxDP := rn.Query["maxDataPoints"]; ok {
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if floatMaxDP, ok = rawMaxDP.(float64); !ok {
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return nil, fmt.Errorf("expected maxDataPoints to be an float64, got type %T for refId %v", rawMaxDP, rn.RefID)
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}
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dsNode.maxDP = int64(floatMaxDP)
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}
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return dsNode, nil
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}
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// Execute runs the node and adds the results to vars. If the node requires
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// other nodes they must have already been executed and their results must
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// already by in vars.
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func (dn *DSNode) Execute(ctx context.Context, vars mathexp.Vars, s *Service) (mathexp.Results, error) {
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pc := backend.PluginContext{
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OrgID: dn.orgID,
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DataSourceInstanceSettings: &backend.DataSourceInstanceSettings{
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ID: dn.datasourceID,
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UID: dn.datasourceUID,
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},
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}
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q := []backend.DataQuery{
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{
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RefID: dn.refID,
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MaxDataPoints: dn.maxDP,
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Interval: time.Duration(int64(time.Millisecond) * dn.intervalMS),
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JSON: dn.query,
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TimeRange: backend.TimeRange{
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From: dn.timeRange.From,
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To: dn.timeRange.To,
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},
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QueryType: dn.queryType,
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},
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}
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resp, err := s.queryData(ctx, &backend.QueryDataRequest{
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PluginContext: pc,
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Queries: q,
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})
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if err != nil {
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return mathexp.Results{}, err
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}
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vals := make([]mathexp.Value, 0)
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for refID, qr := range resp.Responses {
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if qr.Error != nil {
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return mathexp.Results{}, fmt.Errorf("failed to execute query %v: %w", refID, qr.Error)
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}
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if len(qr.Frames) == 1 {
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frame := qr.Frames[0]
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if frame.TimeSeriesSchema().Type == data.TimeSeriesTypeNot && isNumberTable(frame) {
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logger.Debug("expression datasource query (numberSet)", "query", refID)
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numberSet, err := extractNumberSet(frame)
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if err != nil {
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return mathexp.Results{}, err
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}
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for _, n := range numberSet {
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vals = append(vals, n)
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}
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return mathexp.Results{
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Values: vals,
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}, nil
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}
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}
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for _, frame := range qr.Frames {
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logger.Debug("expression datasource query (seriesSet)", "query", refID)
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series, err := WideToMany(frame)
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if err != nil {
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return mathexp.Results{}, err
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}
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for _, s := range series {
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vals = append(vals, s)
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}
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}
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}
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return mathexp.Results{
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Values: vals,
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}, nil
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}
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func isNumberTable(frame *data.Frame) bool {
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if frame == nil || frame.Fields == nil {
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return false
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}
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numericCount := 0
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stringCount := 0
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otherCount := 0
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for _, field := range frame.Fields {
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fType := field.Type()
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switch {
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case fType.Numeric():
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numericCount++
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case fType == data.FieldTypeString || fType == data.FieldTypeNullableString:
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stringCount++
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default:
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otherCount++
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}
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}
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return numericCount == 1 && otherCount == 0
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}
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func extractNumberSet(frame *data.Frame) ([]mathexp.Number, error) {
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numericField := 0
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stringFieldIdxs := []int{}
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stringFieldNames := []string{}
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for i, field := range frame.Fields {
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fType := field.Type()
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switch {
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case fType.Numeric():
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numericField = i
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case fType == data.FieldTypeString || fType == data.FieldTypeNullableString:
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stringFieldIdxs = append(stringFieldIdxs, i)
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stringFieldNames = append(stringFieldNames, field.Name)
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}
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}
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numbers := make([]mathexp.Number, frame.Rows())
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for rowIdx := 0; rowIdx < frame.Rows(); rowIdx++ {
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val, _ := frame.FloatAt(numericField, rowIdx)
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var labels data.Labels
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for i := 0; i < len(stringFieldIdxs); i++ {
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if i == 0 {
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labels = make(data.Labels)
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}
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key := stringFieldNames[i] // TODO check for duplicate string column names
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val, _ := frame.ConcreteAt(stringFieldIdxs[i], rowIdx)
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labels[key] = val.(string) // TODO check assertion / return error
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}
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n := mathexp.NewNumber("", labels)
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n.SetValue(&val)
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numbers[rowIdx] = n
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}
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return numbers, nil
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}
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// WideToMany converts a data package wide type Frame to one or multiple Series. A series
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// is created for each value type column of wide frame.
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//
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// This might not be a good idea long term, but works now as an adapter/shim.
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func WideToMany(frame *data.Frame) ([]mathexp.Series, error) {
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tsSchema := frame.TimeSeriesSchema()
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if tsSchema.Type != data.TimeSeriesTypeWide {
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return nil, fmt.Errorf("input data must be a wide series but got type %s (input refid)", tsSchema.Type)
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}
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if len(tsSchema.ValueIndices) == 1 {
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s, err := mathexp.SeriesFromFrame(frame)
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if err != nil {
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return nil, err
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}
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return []mathexp.Series{s}, nil
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}
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series := []mathexp.Series{}
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for _, valIdx := range tsSchema.ValueIndices {
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l := frame.Rows()
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f := data.NewFrameOfFieldTypes(frame.Name, l, frame.Fields[tsSchema.TimeIndex].Type(), frame.Fields[valIdx].Type())
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f.Fields[0].Name = frame.Fields[tsSchema.TimeIndex].Name
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f.Fields[1].Name = frame.Fields[valIdx].Name
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if frame.Fields[valIdx].Labels != nil {
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f.Fields[1].Labels = frame.Fields[valIdx].Labels.Copy()
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}
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for i := 0; i < l; i++ {
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f.SetRow(i, frame.Fields[tsSchema.TimeIndex].CopyAt(i), frame.Fields[valIdx].CopyAt(i))
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}
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s, err := mathexp.SeriesFromFrame(f)
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if err != nil {
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return nil, err
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}
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series = append(series, s)
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}
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return series, nil
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}
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