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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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7
pkg/setting/setting_data_proxy.go
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@ -2,6 +2,8 @@ package setting
import "gopkg.in/ini.v1"
const defaultDataProxyRowLimit = int64(1000000)
func readDataProxySettings(iniFile *ini.File, cfg *Cfg) error {
dataproxy := iniFile.Section("dataproxy")
cfg.SendUserHeader = dataproxy.Key("send_user_header").MustBool(false)
@ -15,6 +17,11 @@ func readDataProxySettings(iniFile *ini.File, cfg *Cfg) error {
cfg.DataProxyMaxIdleConns = dataproxy.Key("max_idle_connections").MustInt()
cfg.DataProxyIdleConnTimeout = dataproxy.Key("idle_conn_timeout_seconds").MustInt(90)
cfg.ResponseLimit = dataproxy.Key("response_limit").MustInt64(0)
cfg.DataProxyRowLimit = dataproxy.Key("row_limit").MustInt64(defaultDataProxyRowLimit)
if cfg.DataProxyRowLimit <= 0 {
cfg.DataProxyRowLimit = defaultDataProxyRowLimit
}
if val, err := dataproxy.Key("max_idle_connections_per_host").Int(); err == nil {
cfg.Logger.Warn("[Deprecated] the configuration setting 'max_idle_connections_per_host' is deprecated, please use 'max_idle_connections' instead")