mirror of
https://github.com/grafana/grafana.git
synced 2024-11-23 09:26:43 -06:00
111 lines
3.0 KiB
Go
111 lines
3.0 KiB
Go
package mssql
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import (
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"database/sql"
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"fmt"
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"strconv"
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"github.com/grafana/grafana/pkg/setting"
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_ "github.com/denisenkom/go-mssqldb"
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"github.com/grafana/grafana/pkg/infra/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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"github.com/grafana/grafana/pkg/tsdb/sqleng"
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"github.com/grafana/grafana/pkg/util"
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"github.com/grafana/grafana/pkg/util/errutil"
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"xorm.io/core"
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)
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func init() {
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tsdb.RegisterTsdbQueryEndpoint("mssql", newMssqlQueryEndpoint)
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}
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func newMssqlQueryEndpoint(datasource *models.DataSource) (tsdb.TsdbQueryEndpoint, error) {
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logger := log.New("tsdb.mssql")
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cnnstr, err := generateConnectionString(datasource)
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if err != nil {
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return nil, err
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}
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if setting.Env == setting.DEV {
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logger.Debug("getEngine", "connection", cnnstr)
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}
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config := sqleng.SqlQueryEndpointConfiguration{
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DriverName: "mssql",
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ConnectionString: cnnstr,
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Datasource: datasource,
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MetricColumnTypes: []string{"VARCHAR", "CHAR", "NVARCHAR", "NCHAR"},
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}
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queryResultTransformer := mssqlQueryResultTransformer{
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log: logger,
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}
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return sqleng.NewSqlQueryEndpoint(&config, &queryResultTransformer, newMssqlMacroEngine(), logger)
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}
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func generateConnectionString(datasource *models.DataSource) (string, error) {
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addr, err := util.SplitHostPortDefault(datasource.Url, "localhost", "1433")
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if err != nil {
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return "", errutil.Wrapf(err, "Invalid data source URL '%s'", datasource.Url)
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}
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encrypt := datasource.JsonData.Get("encrypt").MustString("false")
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connStr := fmt.Sprintf("server=%s;port=%s;database=%s;user id=%s;password=%s;",
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addr.Host,
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addr.Port,
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datasource.Database,
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datasource.User,
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datasource.DecryptedPassword(),
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)
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if encrypt != "false" {
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connStr += fmt.Sprintf("encrypt=%s;", encrypt)
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}
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return connStr, nil
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}
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type mssqlQueryResultTransformer struct {
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log log.Logger
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}
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func (t *mssqlQueryResultTransformer) TransformQueryResult(columnTypes []*sql.ColumnType, rows *core.Rows) (tsdb.RowValues, error) {
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values := make([]interface{}, len(columnTypes))
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valuePtrs := make([]interface{}, len(columnTypes))
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for i := range columnTypes {
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// debug output on large tables causes high memory utilization/leak
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// t.log.Debug("type", "type", stype)
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valuePtrs[i] = &values[i]
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}
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if err := rows.Scan(valuePtrs...); err != nil {
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return nil, err
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}
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// convert types not handled by denisenkom/go-mssqldb
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// unhandled types are returned as []byte
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for i := 0; i < len(columnTypes); i++ {
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if value, ok := values[i].([]byte); ok {
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switch columnTypes[i].DatabaseTypeName() {
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case "MONEY", "SMALLMONEY", "DECIMAL":
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if v, err := strconv.ParseFloat(string(value), 64); err == nil {
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values[i] = v
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} else {
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t.log.Debug("Rows", "Error converting numeric to float", value)
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}
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default:
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t.log.Debug("Rows", "Unknown database type", columnTypes[i].DatabaseTypeName(), "value", value)
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values[i] = string(value)
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}
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}
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}
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return values, nil
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}
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func (t *mssqlQueryResultTransformer) TransformQueryError(err error) error {
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return err
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}
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