mirror of
https://github.com/grafana/grafana.git
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319 lines
8.3 KiB
Go
319 lines
8.3 KiB
Go
package mysql
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import (
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"container/list"
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"context"
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"database/sql"
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"fmt"
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"math"
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"strconv"
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"time"
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"github.com/go-sql-driver/mysql"
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"github.com/go-xorm/core"
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"github.com/grafana/grafana/pkg/components/null"
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"github.com/grafana/grafana/pkg/log"
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"github.com/grafana/grafana/pkg/models"
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"github.com/grafana/grafana/pkg/tsdb"
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)
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type MysqlQueryEndpoint struct {
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sqlEngine tsdb.SqlEngine
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log log.Logger
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}
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func init() {
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tsdb.RegisterTsdbQueryEndpoint("mysql", NewMysqlQueryEndpoint)
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}
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func NewMysqlQueryEndpoint(datasource *models.DataSource) (tsdb.TsdbQueryEndpoint, error) {
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endpoint := &MysqlQueryEndpoint{
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log: log.New("tsdb.mysql"),
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}
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endpoint.sqlEngine = &tsdb.DefaultSqlEngine{
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MacroEngine: NewMysqlMacroEngine(),
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}
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cnnstr := fmt.Sprintf("%s:%s@%s(%s)/%s?collation=utf8mb4_unicode_ci&parseTime=true&loc=UTC&allowNativePasswords=true",
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datasource.User,
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datasource.Password,
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"tcp",
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datasource.Url,
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datasource.Database,
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)
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endpoint.log.Debug("getEngine", "connection", cnnstr)
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if err := endpoint.sqlEngine.InitEngine("mysql", datasource, cnnstr); err != nil {
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return nil, err
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}
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return endpoint, nil
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}
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// Query is the main function for the MysqlExecutor
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func (e *MysqlQueryEndpoint) Query(ctx context.Context, dsInfo *models.DataSource, tsdbQuery *tsdb.TsdbQuery) (*tsdb.Response, error) {
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return e.sqlEngine.Query(ctx, dsInfo, tsdbQuery, e.transformToTimeSeries, e.transformToTable)
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}
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func (e MysqlQueryEndpoint) transformToTable(query *tsdb.Query, rows *core.Rows, result *tsdb.QueryResult, tsdbQuery *tsdb.TsdbQuery) error {
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columnNames, err := rows.Columns()
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columnCount := len(columnNames)
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if err != nil {
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return err
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}
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table := &tsdb.Table{
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Columns: make([]tsdb.TableColumn, columnCount),
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Rows: make([]tsdb.RowValues, 0),
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}
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for i, name := range columnNames {
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table.Columns[i].Text = name
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}
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columnTypes, err := rows.ColumnTypes()
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if err != nil {
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return err
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}
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rowLimit := 1000000
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rowCount := 0
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for ; rows.Next(); rowCount++ {
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if rowCount > rowLimit {
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return fmt.Errorf("MySQL query row limit exceeded, limit %d", rowLimit)
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}
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values, err := e.getTypedRowData(columnTypes, rows)
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if err != nil {
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return err
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}
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table.Rows = append(table.Rows, values)
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}
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result.Tables = append(result.Tables, table)
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result.Meta.Set("rowCount", rowCount)
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return nil
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}
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func (e MysqlQueryEndpoint) getTypedRowData(types []*sql.ColumnType, rows *core.Rows) (tsdb.RowValues, error) {
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values := make([]interface{}, len(types))
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for i, stype := range types {
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e.log.Debug("type", "type", stype)
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switch stype.DatabaseTypeName() {
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case mysql.FieldTypeNameTiny:
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values[i] = new(int8)
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case mysql.FieldTypeNameInt24:
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values[i] = new(int32)
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case mysql.FieldTypeNameShort:
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values[i] = new(int16)
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case mysql.FieldTypeNameVarString:
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values[i] = new(string)
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case mysql.FieldTypeNameVarChar:
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values[i] = new(string)
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case mysql.FieldTypeNameLong:
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values[i] = new(int)
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case mysql.FieldTypeNameLongLong:
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values[i] = new(int64)
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case mysql.FieldTypeNameDouble:
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values[i] = new(float64)
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case mysql.FieldTypeNameDecimal:
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values[i] = new(float32)
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case mysql.FieldTypeNameNewDecimal:
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values[i] = new(float64)
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case mysql.FieldTypeNameFloat:
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values[i] = new(float64)
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case mysql.FieldTypeNameTimestamp:
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values[i] = new(time.Time)
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case mysql.FieldTypeNameDateTime:
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values[i] = new(time.Time)
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case mysql.FieldTypeNameTime:
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values[i] = new(string)
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case mysql.FieldTypeNameYear:
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values[i] = new(int16)
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case mysql.FieldTypeNameNULL:
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values[i] = nil
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case mysql.FieldTypeNameBit:
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values[i] = new([]byte)
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case mysql.FieldTypeNameBLOB:
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values[i] = new(string)
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case mysql.FieldTypeNameTinyBLOB:
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values[i] = new(string)
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case mysql.FieldTypeNameMediumBLOB:
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values[i] = new(string)
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case mysql.FieldTypeNameLongBLOB:
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values[i] = new(string)
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case mysql.FieldTypeNameString:
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values[i] = new(string)
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case mysql.FieldTypeNameDate:
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values[i] = new(string)
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default:
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return nil, fmt.Errorf("Database type %s not supported", stype.DatabaseTypeName())
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}
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}
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if err := rows.Scan(values...); err != nil {
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return nil, err
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}
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return values, nil
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}
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func (e MysqlQueryEndpoint) transformToTimeSeries(query *tsdb.Query, rows *core.Rows, result *tsdb.QueryResult, tsdbQuery *tsdb.TsdbQuery) error {
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pointsBySeries := make(map[string]*tsdb.TimeSeries)
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seriesByQueryOrder := list.New()
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columnNames, err := rows.Columns()
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if err != nil {
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return err
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}
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rowData := NewStringStringScan(columnNames)
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rowLimit := 1000000
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rowCount := 0
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fillMissing := query.Model.Get("fill").MustBool(false)
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var fillInterval float64
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fillValue := null.Float{}
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if fillMissing {
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fillInterval = query.Model.Get("fillInterval").MustFloat64() * 1000
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if query.Model.Get("fillNull").MustBool(false) == false {
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fillValue.Float64 = query.Model.Get("fillValue").MustFloat64()
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fillValue.Valid = true
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}
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}
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for ; rows.Next(); rowCount++ {
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if rowCount > rowLimit {
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return fmt.Errorf("MySQL query row limit exceeded, limit %d", rowLimit)
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}
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err := rowData.Update(rows.Rows)
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if err != nil {
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e.log.Error("MySQL response parsing", "error", err)
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return fmt.Errorf("MySQL response parsing error %v", err)
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}
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if rowData.metric == "" {
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rowData.metric = "Unknown"
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}
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if !rowData.time.Valid {
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return fmt.Errorf("Found row with no time value")
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}
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series, exist := pointsBySeries[rowData.metric]
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if exist == false {
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series = &tsdb.TimeSeries{Name: rowData.metric}
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pointsBySeries[rowData.metric] = series
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seriesByQueryOrder.PushBack(rowData.metric)
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}
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if fillMissing {
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var intervalStart float64
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if exist == false {
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intervalStart = float64(tsdbQuery.TimeRange.MustGetFrom().UnixNano() / 1e6)
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} else {
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intervalStart = series.Points[len(series.Points)-1][1].Float64 + fillInterval
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}
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// align interval start
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intervalStart = math.Floor(intervalStart/fillInterval) * fillInterval
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for i := intervalStart; i < rowData.time.Float64; i += fillInterval {
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series.Points = append(series.Points, tsdb.TimePoint{fillValue, null.FloatFrom(i)})
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rowCount++
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}
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}
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series.Points = append(series.Points, tsdb.TimePoint{rowData.value, rowData.time})
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}
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for elem := seriesByQueryOrder.Front(); elem != nil; elem = elem.Next() {
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key := elem.Value.(string)
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result.Series = append(result.Series, pointsBySeries[key])
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if fillMissing {
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series := pointsBySeries[key]
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// fill in values from last fetched value till interval end
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intervalStart := series.Points[len(series.Points)-1][1].Float64
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intervalEnd := float64(tsdbQuery.TimeRange.MustGetTo().UnixNano() / 1e6)
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// align interval start
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intervalStart = math.Floor(intervalStart/fillInterval) * fillInterval
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for i := intervalStart + fillInterval; i < intervalEnd; i += fillInterval {
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series.Points = append(series.Points, tsdb.TimePoint{fillValue, null.FloatFrom(i)})
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rowCount++
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}
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}
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}
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result.Meta.Set("rowCount", rowCount)
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return nil
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}
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type stringStringScan struct {
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rowPtrs []interface{}
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rowValues []string
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columnNames []string
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columnCount int
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time null.Float
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value null.Float
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metric string
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}
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func NewStringStringScan(columnNames []string) *stringStringScan {
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s := &stringStringScan{
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columnCount: len(columnNames),
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columnNames: columnNames,
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rowPtrs: make([]interface{}, len(columnNames)),
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rowValues: make([]string, len(columnNames)),
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}
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for i := 0; i < s.columnCount; i++ {
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s.rowPtrs[i] = new(sql.RawBytes)
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}
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return s
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}
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func (s *stringStringScan) Update(rows *sql.Rows) error {
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if err := rows.Scan(s.rowPtrs...); err != nil {
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return err
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}
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s.time = null.FloatFromPtr(nil)
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s.value = null.FloatFromPtr(nil)
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for i := 0; i < s.columnCount; i++ {
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if rb, ok := s.rowPtrs[i].(*sql.RawBytes); ok {
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s.rowValues[i] = string(*rb)
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switch s.columnNames[i] {
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case "time_sec":
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if sec, err := strconv.ParseInt(s.rowValues[i], 10, 64); err == nil {
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s.time = null.FloatFrom(float64(sec * 1000))
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}
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case "value":
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if value, err := strconv.ParseFloat(s.rowValues[i], 64); err == nil {
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s.value = null.FloatFrom(value)
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}
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case "metric":
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s.metric = s.rowValues[i]
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}
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*rb = nil // reset pointer to discard current value to avoid a bug
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} else {
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return fmt.Errorf("Cannot convert index %d column %s to type *sql.RawBytes", i, s.columnNames[i])
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}
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}
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return nil
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}
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