mirror of https://github.com/grafana/grafana.git
124 lines
3.4 KiB
Go
124 lines
3.4 KiB
Go
package expr
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import (
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"context"
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"errors"
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"fmt"
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"time"
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"github.com/grafana/grafana-plugin-sdk-go/data"
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"github.com/grafana/grafana/pkg/apimachinery/errutil"
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"github.com/grafana/grafana/pkg/expr/mathexp"
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"github.com/grafana/grafana/pkg/expr/sql"
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"github.com/grafana/grafana/pkg/infra/tracing"
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)
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// SQLCommand is an expression to run SQL over results
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type SQLCommand struct {
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query string
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varsToQuery []string
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refID string
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}
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// NewSQLCommand creates a new SQLCommand.
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func NewSQLCommand(refID, rawSQL string) (*SQLCommand, error) {
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if rawSQL == "" {
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return nil, errutil.BadRequest("sql-missing-query",
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errutil.WithPublicMessage("missing SQL query"))
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}
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tables, err := sql.TablesList(rawSQL)
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if err != nil {
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logger.Warn("invalid sql query", "sql", rawSQL, "error", err)
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return nil, errutil.BadRequest("sql-invalid-sql",
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errutil.WithPublicMessage("error reading SQL command"),
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)
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}
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if len(tables) == 0 {
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logger.Warn("no tables found in SQL query", "sql", rawSQL)
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}
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if tables != nil {
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logger.Debug("REF tables", "tables", tables, "sql", rawSQL)
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}
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return &SQLCommand{
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query: rawSQL,
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varsToQuery: tables,
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refID: refID,
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}, nil
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}
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// UnmarshalSQLCommand creates a SQLCommand from Grafana's frontend query.
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func UnmarshalSQLCommand(rn *rawNode) (*SQLCommand, error) {
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if rn.TimeRange == nil {
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logger.Error("time range must be specified for refID", "refID", rn.RefID)
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return nil, fmt.Errorf("time range must be specified for refID %s", rn.RefID)
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}
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expressionRaw, ok := rn.Query["expression"]
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if !ok {
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logger.Error("no expression in the query", "query", rn.Query)
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return nil, errors.New("no expression in the query")
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}
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expression, ok := expressionRaw.(string)
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if !ok {
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logger.Error("expected sql expression to be type string", "expression", expressionRaw)
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return nil, fmt.Errorf("expected sql expression to be type string, but got type %T", expressionRaw)
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}
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return NewSQLCommand(rn.RefID, expression)
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}
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// NeedsVars returns the variable names (refIds) that are dependencies
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// to execute the command and allows the command to fulfill the Command interface.
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func (gr *SQLCommand) NeedsVars() []string {
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return gr.varsToQuery
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}
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// Execute runs the command and returns the results or an error if the command
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// failed to execute.
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func (gr *SQLCommand) Execute(ctx context.Context, now time.Time, vars mathexp.Vars, tracer tracing.Tracer) (mathexp.Results, error) {
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_, span := tracer.Start(ctx, "SSE.ExecuteSQL")
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defer span.End()
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allFrames := []*data.Frame{}
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for _, ref := range gr.varsToQuery {
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results, ok := vars[ref]
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if !ok {
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logger.Warn("no results found for", "ref", ref)
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continue
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}
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frames := results.Values.AsDataFrames(ref)
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allFrames = append(allFrames, frames...)
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}
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rsp := mathexp.Results{}
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db := sql.DB{}
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logger.Debug("Executing query", "query", gr.query, "frames", len(allFrames))
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frame, err := db.QueryFrames(ctx, gr.refID, gr.query, allFrames)
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if err != nil {
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logger.Error("Failed to query frames", "error", err.Error())
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rsp.Error = err
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return rsp, nil
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}
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logger.Debug("Done Executing query", "query", gr.query, "rows", frame.Rows())
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if frame.Rows() == 0 {
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rsp.Values = mathexp.Values{
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mathexp.NoData{Frame: frame},
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}
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return rsp, nil
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}
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rsp.Values = mathexp.Values{
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mathexp.TableData{Frame: frame},
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}
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return rsp, nil
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}
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func (gr *SQLCommand) Type() string {
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return TypeSQL.String()
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}
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