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Postgres/MySQL/MSSQL: Add setting to limit maximum amount of rows processed (#38986)

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Adds a new setting dataproxy.row_limit that allows an operator to limit the 
amount of rows being processed/accepted in response to database queries 
originating from SQL data sources.

Closes #38975
Ref #39095

Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>
This commit is contained in:
Marcus Efraimsson
2021-09-13 15:27:51 +02:00
committed by GitHub
parent 5b7dc16c06
commit 1c892a2fc4
12 changed files with 279 additions and 21 deletions
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8
pkg/tsdb/mysql/mysql.go
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@ -46,8 +46,7 @@ func characterEscape(s string, escapeChar string) string {
func ProvideService(cfg *setting.Cfg, manager backendplugin.Manager, httpClientProvider httpclient.Provider) (*Service, error) {
s := &Service{
Cfg: cfg,
im: datasource.NewInstanceManager(newInstanceSettings(httpClientProvider)),
im: datasource.NewInstanceManager(newInstanceSettings(cfg, httpClientProvider)),
}
factory := coreplugin.New(backend.ServeOpts{
QueryDataHandler: s,
@ -59,7 +58,7 @@ func ProvideService(cfg *setting.Cfg, manager backendplugin.Manager, httpClientP
return s, nil
}
func newInstanceSettings(httpClientProvider httpclient.Provider) datasource.InstanceFactoryFunc {
func newInstanceSettings(cfg *setting.Cfg, httpClientProvider httpclient.Provider) datasource.InstanceFactoryFunc {
return func(settings backend.DataSourceInstanceSettings) (instancemgmt.Instance, error) {
jsonData := sqleng.JsonData{
MaxOpenConns: 0,
@ -117,7 +116,7 @@ func newInstanceSettings(httpClientProvider httpclient.Provider) datasource.Inst
cnnstr += fmt.Sprintf("&time_zone='%s'", url.QueryEscape(dsInfo.JsonData.Timezone))
}
if setting.Env == setting.Dev {
if cfg.Env == setting.Dev {
logger.Debug("getEngine", "connection", cnnstr)
}
@ -127,6 +126,7 @@ func newInstanceSettings(httpClientProvider httpclient.Provider) datasource.Inst
DSInfo: dsInfo,
TimeColumnNames: []string{"time", "time_sec"},
MetricColumnTypes: []string{"CHAR", "VARCHAR", "TINYTEXT", "TEXT", "MEDIUMTEXT", "LONGTEXT"},
RowLimit: cfg.DataProxyRowLimit,
}
rowTransformer := mysqlQueryResultTransformer{