Improved perfs

internal/config/config.go

@@ -3,6 +3,7 @@ package config
 import (
 	"fmt"
 	"os"
+	"strconv"
 	"strings"
 
 	"github.com/BurntSushi/toml"
@@ -14,8 +15,9 @@ type Config struct {
 }
 
 type ServerConfig struct {
-	Listen     string `toml:"listen"`
-	StorageDir string `toml:"storage_dir"`
+	Listen           string  `toml:"listen"`
+	StorageDir       string  `toml:"storage_dir"`
+	MaxUpdateRateHz  float64 `toml:"max_update_rate_hz"` // 0 = unlimited
 }
 
 type DatasourceConfig struct {
@@ -84,6 +86,11 @@ func applyEnv(cfg *Config) {
 	if v := env("UOPI_SERVER_STORAGE_DIR"); v != "" {
 		cfg.Server.StorageDir = v
 	}
+	if v := env("UOPI_SERVER_MAX_UPDATE_RATE_HZ"); v != "" {
+		if hz, err := strconv.ParseFloat(v, 64); err == nil {
+			cfg.Server.MaxUpdateRateHz = hz
+		}
+	}
 	if v := env("UOPI_EPICS_CA_ADDR_LIST"); v != "" {
 		cfg.Datasource.EPICS.CAAddrList = v
 	}