perf: parallelize GetFullMeasurementSet with errgroup

- run 5 independent DB queries concurrently via errgroup.WithContext
  - add ctx parameter and bind db with WithContext for cancellation support
  - replace silent error swallowing (if err == nil) with wrapped error returns
  - promote golang.org/x/sync to direct dependency in go.mod

database/query_component_measurement.go

@@ -2,8 +2,12 @@
 package database
 
 import (
+	"context"
+	"fmt"
+
 	"modelRT/orm"
 
+	"golang.org/x/sync/errgroup"
 	"gorm.io/gorm"
 )
 
@@ -17,7 +21,7 @@ type StationWithParent struct {
 	ZoneTag string `gorm:"column:zone_tag"`
 }
 
-func GetFullMeasurementSet(db *gorm.DB) (*orm.MeasurementSet, error) {
+func GetFullMeasurementSet(ctx context.Context, db *gorm.DB) (*orm.MeasurementSet, error) {
 	mSet := &orm.MeasurementSet{
 		GridToZoneTags:       make(map[string][]string),
 		ZoneToStationTags:    make(map[string][]string),
@@ -26,85 +30,110 @@ func GetFullMeasurementSet(db *gorm.DB) (*orm.MeasurementSet, error) {
 		CompTagToMeasTags:    make(map[string][]string),
 	}
 
-	var grids []orm.Grid
-	if err := db.Table("grid").Select("tagname").Scan(&grids).Error; err == nil {
-		for _, g := range grids {
-			if g.TAGNAME != "" {
-				mSet.AllGridTags = append(mSet.AllGridTags, g.TAGNAME)
+	g, gctx := errgroup.WithContext(ctx)
+	db = db.WithContext(gctx)
+
+	g.Go(func() error {
+		var grids []orm.Grid
+		if err := db.Table("grid").Select("tagname").Scan(&grids).Error; err != nil {
+			return fmt.Errorf("query grids: %w", err)
+		}
+		for _, grid := range grids {
+			if grid.TAGNAME != "" {
+				mSet.AllGridTags = append(mSet.AllGridTags, grid.TAGNAME)
 			}
 		}
-	}
+		return nil
+	})
 
-	var zones []struct {
-		orm.Zone
-		GridTag string `gorm:"column:grid_tag"`
-	}
-	if err := db.Table("zone").
-		Select("zone.*, grid.tagname as grid_tag").
-		Joins("left join grid on zone.grid_id = grid.id").
-		Scan(&zones).Error; err == nil {
+	g.Go(func() error {
+		var zones []struct {
+			orm.Zone
+			GridTag string `gorm:"column:grid_tag"`
+		}
+		if err := db.Table("zone").
+			Select("zone.*, grid.tagname as grid_tag").
+			Joins("left join grid on zone.grid_id = grid.id").
+			Scan(&zones).Error; err != nil {
+			return fmt.Errorf("query zones: %w", err)
+		}
 		for _, z := range zones {
 			mSet.AllZoneTags = append(mSet.AllZoneTags, z.TAGNAME)
 			if z.GridTag != "" {
 				mSet.GridToZoneTags[z.GridTag] = append(mSet.GridToZoneTags[z.GridTag], z.TAGNAME)
 			}
 		}
-	}
+		return nil
+	})
 
-	var stations []struct {
-		orm.Station
-		ZoneTag string `gorm:"column:zone_tag"`
-	}
-	if err := db.Table("station").
-		Select("station.*, zone.tagname as zone_tag").
-		Joins("left join zone on station.zone_id = zone.id").
-		Scan(&stations).Error; err == nil {
+	g.Go(func() error {
+		var stations []struct {
+			orm.Station
+			ZoneTag string `gorm:"column:zone_tag"`
+		}
+		if err := db.Table("station").
+			Select("station.*, zone.tagname as zone_tag").
+			Joins("left join zone on station.zone_id = zone.id").
+			Scan(&stations).Error; err != nil {
+			return fmt.Errorf("query stations: %w", err)
+		}
 		for _, s := range stations {
 			mSet.AllStationTags = append(mSet.AllStationTags, s.TAGNAME)
 			if s.ZoneTag != "" {
 				mSet.ZoneToStationTags[s.ZoneTag] = append(mSet.ZoneToStationTags[s.ZoneTag], s.TAGNAME)
 			}
 		}
-	}
+		return nil
+	})
 
-	var comps []struct {
-		orm.Component
-		StationTag string `gorm:"column:station_tag"`
-	}
-	if err := db.Table("component").
-		Select("component.*, station.tagname as station_tag").
-		Joins("left join station on component.station_id = station.id").
-		Scan(&comps).Error; err == nil {
+	g.Go(func() error {
+		var comps []struct {
+			orm.Component
+			StationTag string `gorm:"column:station_tag"`
+		}
+		if err := db.Table("component").
+			Select("component.*, station.tagname as station_tag").
+			Joins("left join station on component.station_id = station.id").
+			Scan(&comps).Error; err != nil {
+			return fmt.Errorf("query components: %w", err)
+		}
 		for _, c := range comps {
 			mSet.AllCompNSPaths = append(mSet.AllCompNSPaths, c.NSPath)
 			mSet.AllCompTags = append(mSet.AllCompTags, c.Tag)
-
 			if c.StationTag != "" {
 				mSet.StationToCompNSPaths[c.StationTag] = append(mSet.StationToCompNSPaths[c.StationTag], c.NSPath)
 			}
-
 			if c.NSPath != "" {
 				mSet.CompNSPathToCompTags[c.NSPath] = append(mSet.CompNSPathToCompTags[c.NSPath], c.Tag)
 			}
 		}
-	}
+		return nil
+	})
 
-	mSet.AllConfigTags = append(mSet.AllConfigTags, "bay")
-
-	var measurements []struct {
-		orm.Measurement
-		CompTag string `gorm:"column:comp_tag"`
-	}
-	if err := db.Table("measurement").
-		Select("measurement.*, component.tag as comp_tag").
-		Joins("left join component on measurement.component_uuid = component.global_uuid").
-		Scan(&measurements).Error; err == nil {
+	g.Go(func() error {
+		var measurements []struct {
+			orm.Measurement
+			CompTag string `gorm:"column:comp_tag"`
+		}
+		if err := db.Table("measurement").
+			Select("measurement.*, component.tag as comp_tag").
+			Joins("left join component on measurement.component_uuid = component.global_uuid").
+			Scan(&measurements).Error; err != nil {
+			return fmt.Errorf("query measurements: %w", err)
+		}
 		for _, m := range measurements {
 			mSet.AllMeasTags = append(mSet.AllMeasTags, m.Tag)
 			if m.CompTag != "" {
 				mSet.CompTagToMeasTags[m.CompTag] = append(mSet.CompTagToMeasTags[m.CompTag], m.Tag)
 			}
 		}
+		return nil
+	})
+
+	if err := g.Wait(); err != nil {
+		return nil, err
 	}
+
+	mSet.AllConfigTags = append(mSet.AllConfigTags, "bay")
 	return mSet, nil
 }

go.mod

@@ -27,6 +27,7 @@ require (
 	go.opentelemetry.io/otel/sdk v1.43.0
 	go.opentelemetry.io/otel/trace v1.43.0
 	go.uber.org/zap v1.27.0
+	golang.org/x/sync v0.20.0
 	gorm.io/driver/mysql v1.5.7
 	gorm.io/driver/postgres v1.5.9
 	gorm.io/gorm v1.25.12
@@ -94,7 +95,6 @@ require (
 	golang.org/x/crypto v0.49.0 // indirect
 	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
 	golang.org/x/net v0.52.0 // indirect
-	golang.org/x/sync v0.20.0 // indirect
 	golang.org/x/sys v0.42.0 // indirect
 	golang.org/x/text v0.35.0 // indirect
 	golang.org/x/tools v0.42.0 // indirect

main.go

@@ -214,7 +214,7 @@ func main() {
 			panic(err)
 		}
 
-		measurementSet, err := database.GetFullMeasurementSet(tx)
+		measurementSet, err := database.GetFullMeasurementSet(ctx, tx)
 		if err != nil {
 			logger.Error(ctx, "generate component measurement group failed", "error", err)
 			panic(err)