refactor: replace gperr.Builder with gperr.Group for concurrent error handling

- Updated various files to utilize gperr.Group for cleaner concurrency error handling.
- Removed sync.WaitGroup usage, simplifying the code structure.
- Ensured consistent error reporting across different components.

internal/api/v1/metrics/all_system_info.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/json"
 	"net/http"
-	"sync"
 	"sync/atomic"
 	"time"
 
@@ -103,54 +102,52 @@ func AllSystemInfo(c *gin.Context) {
 
 	// processing function for one round.
 	doRound := func() (bool, error) {
-		var roundWg sync.WaitGroup
 		var numErrs atomic.Int32
 
 		totalAgents := int32(1) // myself
 
-		errs := gperr.NewBuilderWithConcurrency()
+		var errs gperr.Group
 		// get system info for me and all agents in parallel.
-		roundWg.Go(func() {
+		errs.Go(func() error {
 			data, err := systeminfo.Poller.GetRespData(req.Period, query)
 			if err != nil {
-				errs.Add(gperr.Wrap(err, "Main server"))
 				numErrs.Add(1)
-				return
+				return gperr.PrependSubject("Main server", err)
 			}
 			select {
 			case <-manager.Done():
-				return
+				return nil
 			case dataCh <- SystemInfoData{
 				AgentName:  "GoDoxy",
 				SystemInfo: data,
 			}:
 			}
+			return nil
 		})
 
 		for _, a := range agent.IterAgents() {
 			totalAgents++
-			agentShallowCopy := *a
 
-			roundWg.Go(func() {
-				data, err := getAgentSystemInfoWithRetry(manager.Context(), &agentShallowCopy, queryEncoded)
+			errs.Go(func() error {
+				data, err := getAgentSystemInfoWithRetry(manager.Context(), a, queryEncoded)
 				if err != nil {
-					errs.Add(gperr.Wrap(err, "Agent "+agentShallowCopy.Name))
 					numErrs.Add(1)
-					return
+					return gperr.PrependSubject("Agent "+a.Name, err)
 				}
 				select {
 				case <-manager.Done():
-					return
+					return nil
 				case dataCh <- SystemInfoData{
-					AgentName:  agentShallowCopy.Name,
+					AgentName:  a.Name,
 					SystemInfo: data,
 				}:
 				}
+				return nil
 			})
 		}
 
-		roundWg.Wait()
-		return numErrs.Load() == totalAgents, errs.Error()
+		err := errs.Wait().Error()
+		return numErrs.Load() == totalAgents, err
 	}
 
 	// write system info immediately once.

internal/config/state.go

@@ -302,13 +302,16 @@ func (state *state) initProxmox() error {
 		return nil
 	}
 
-	errs := gperr.NewBuilder()
+	var errs gperr.Group
 	for _, cfg := range proxmoxCfg {
-		if err := cfg.Init(state.task.Context()); err != nil {
-			errs.Add(err.Subject(cfg.URL))
-		}
+		errs.Go(func() error {
+			if err := cfg.Init(state.task.Context()); err != nil {
+				return err.Subject(cfg.URL)
+			}
+			return nil
+		})
 	}
-	return errs.Error()
+	return errs.Wait().Error()
 }
 
 func (state *state) storeProvider(p types.RouteProvider) {
@@ -326,8 +329,8 @@ func (state *state) loadRouteProviders() error {
 	}()
 
 	providers := &state.Providers
-	errs := gperr.NewBuilderWithConcurrency("route provider errors")
-	results := gperr.NewBuilder("loaded route providers")
+	errs := gperr.NewGroup("route provider errors")
+	results := gperr.NewGroup("loaded route providers")
 
 	agent.RemoveAllAgents()
 
@@ -388,8 +391,6 @@ func (state *state) loadRouteProviders() error {
 		}
 	}
 
-	results.EnableConcurrency()
-
 	// load routes concurrently
 	var providersLoader sync.WaitGroup
 	for _, p := range state.providers.Range {
@@ -402,10 +403,10 @@ func (state *state) loadRouteProviders() error {
 	}
 	providersLoader.Wait()
 
-	state.tmpLog.Info().Msg(results.String())
+	state.tmpLog.Info().Msg(results.Wait().String())
 	state.printRoutesByProvider(lenLongestName)
 	state.printState()
-	return errs.Error()
+	return errs.Wait().Error()
 }
 
 func (state *state) printRoutesByProvider(lenLongestName int) {

internal/idlewatcher/watcher.go

@@ -143,7 +143,7 @@ func NewWatcher(parent task.Parent, r types.Route, cfg *types.IdlewatcherConfig)
 		}
 	}
 
-	depErrors := gperr.NewBuilder()
+	var depErrors gperr.Builder
 	for i, dep := range cfg.DependsOn {
 		depSegments := strings.Split(dep, ":")
 		dep = depSegments[0]

internal/metrics/systeminfo/system_info.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"errors"
 	"net/url"
-	"sync"
 	"syscall"
 	"time"
 
@@ -72,43 +71,41 @@ func isNoDataAvailable(err error) bool {
 }
 
 func getSystemInfo(ctx context.Context, lastResult *SystemInfo) (*SystemInfo, error) {
-	errs := gperr.NewBuilderWithConcurrency("failed to get system info")
+	errs := gperr.NewGroup("failed to get system info")
 	var s SystemInfo
 	s.Timestamp = time.Now().Unix()
 
-	var wg sync.WaitGroup
-
 	if !common.MetricsDisableCPU {
-		wg.Go(func() {
-			errs.Add(s.collectCPUInfo(ctx))
+		errs.Go(func() error {
+			return s.collectCPUInfo(ctx)
 		})
 	}
 	if !common.MetricsDisableMemory {
-		wg.Go(func() {
-			errs.Add(s.collectMemoryInfo(ctx))
+		errs.Go(func() error {
+			return s.collectMemoryInfo(ctx)
 		})
 	}
 	if !common.MetricsDisableDisk {
-		wg.Go(func() {
-			errs.Add(s.collectDisksInfo(ctx, lastResult))
+		errs.Go(func() error {
+			return s.collectDisksInfo(ctx, lastResult)
 		})
 	}
 	if !common.MetricsDisableNetwork {
-		wg.Go(func() {
-			errs.Add(s.collectNetworkInfo(ctx, lastResult))
+		errs.Go(func() error {
+			return s.collectNetworkInfo(ctx, lastResult)
 		})
 	}
 	if !common.MetricsDisableSensors {
-		wg.Go(func() {
-			errs.Add(s.collectSensorsInfo(ctx))
+		errs.Go(func() error {
+			return s.collectSensorsInfo(ctx)
 		})
 	}
-	wg.Wait()
 
-	if errs.HasError() {
+	result := errs.Wait()
+	if result.HasError() {
 		allWarnings := gperr.NewBuilder("")
 		allErrors := gperr.NewBuilder("failed to get system info")
-		errs.ForEach(func(err error) {
+		result.ForEach(func(err error) {
 			warnings := new(warning.Warning)
 			if errors.As(err, &warnings) {
 				for _, warning := range warnings.List {

internal/net/gphttp/loadbalancer/loadbalancer.go

@@ -13,7 +13,6 @@ import (
 	gperr "github.com/yusing/goutils/errs"
 	"github.com/yusing/goutils/pool"
 	"github.com/yusing/goutils/task"
-	"golang.org/x/sync/errgroup"
 )
 
 // TODO: stats of each server.
@@ -223,7 +222,7 @@ func (lb *LoadBalancer) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
 		return
 	}
 	if r.URL.Path == idlewatcher.WakeEventsPath {
-		var errs errgroup.Group
+		var errs gperr.Group
 		// wake all servers
 		for _, srv := range srvs {
 			errs.Go(func() error {
@@ -234,7 +233,7 @@ func (lb *LoadBalancer) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
 				return nil
 			})
 		}
-		if err := errs.Wait(); err != nil {
+		if err := errs.Wait().Error(); err != nil {
 			gperr.LogWarn("failed to wake some servers", err, &lb.l)
 		}
 	}

internal/net/gphttp/middleware/middleware_builder.go

@@ -43,8 +43,8 @@ func BuildMiddlewaresFromYAML(source string, data []byte, eb *gperr.Builder) map
 func compileMiddlewares(middlewaresMap map[string]OptionsRaw) ([]*Middleware, gperr.Error) {
 	middlewares := make([]*Middleware, 0, len(middlewaresMap))
 
-	errs := gperr.NewBuilder()
-	invalidOpts := gperr.NewBuilder()
+	var errs gperr.Builder
+	var invalidOpts gperr.Builder
 
 	for name, opts := range middlewaresMap {
 		m, err := Get(name)
@@ -55,7 +55,7 @@ func compileMiddlewares(middlewaresMap map[string]OptionsRaw) ([]*Middleware, gp
 
 		m, err = m.New(opts)
 		if err != nil {
-			invalidOpts.Add(err.Subject("middlewares." + name))
+			invalidOpts.AddSubjectf(err, "middlewares.%s", name)
 			continue
 		}
 		middlewares = append(middlewares, m)
@@ -78,23 +78,23 @@ func BuildMiddlewareFromMap(name string, middlewaresMap map[string]OptionsRaw) (
 
 // TODO: check conflict or duplicates.
 func BuildMiddlewareFromChainRaw(name string, defs []map[string]any) (*Middleware, gperr.Error) {
-	chainErr := gperr.NewBuilder("")
+	var chainErr gperr.Builder
 	chain := make([]*Middleware, 0, len(defs))
 	for i, def := range defs {
 		if def["use"] == nil || def["use"] == "" {
-			chainErr.Add(ErrMissingMiddlewareUse.Subjectf("%s[%d]", name, i))
+			chainErr.AddSubjectf(ErrMissingMiddlewareUse, "%s[%d]", name, i)
 			continue
 		}
 		baseName := def["use"].(string)
 		base, err := Get(baseName)
 		if err != nil {
-			chainErr.Add(err.Subjectf("%s[%d]", name, i))
+			chainErr.AddSubjectf(err, "%s[%d]", name, i)
 			continue
 		}
 		delete(def, "use")
 		m, err := base.New(def)
 		if err != nil {
-			chainErr.Add(err.Subjectf("%s[%d]", name, i))
+			chainErr.AddSubjectf(err, "%s[%d]", name, i)
 			continue
 		}
 		m.name = fmt.Sprintf("%s[%d]", name, i)

internal/route/provider/provider.go

@@ -97,8 +97,7 @@ func (p *Provider) MarshalText() ([]byte, error) {
 
 // Start implements task.TaskStarter.
 func (p *Provider) Start(parent task.Parent) gperr.Error {
-	errs := gperr.NewBuilder("routes error")
-	errs.EnableConcurrency()
+	errs := gperr.NewGroup("routes error")
 
 	t := parent.Subtask("provider."+p.String(), false)
 
@@ -108,15 +107,13 @@ func (p *Provider) Start(parent task.Parent) gperr.Error {
 		routeSlice = append(routeSlice, r)
 	}
 
-	var wg sync.WaitGroup
 	for _, r := range routeSlice {
-		wg.Add(1)
-		go func(r *route.Route) {
-			defer wg.Done()
-			errs.Add(p.startRoute(t, r))
-		}(r)
+		errs.Go(func() error {
+			return p.startRoute(t, r)
+		})
 	}
-	wg.Wait()
+
+	err := errs.Wait().Error()
 
 	eventQueue := events.NewEventQueue(
 		t.Subtask("event_queue", false),
@@ -133,7 +130,7 @@ func (p *Provider) Start(parent task.Parent) gperr.Error {
 	)
 	eventQueue.Start(p.watcher.Events(t.Context()))
 
-	if err := errs.Error(); err != nil {
+	if err != nil {
 		return err.Subject(p.String())
 	}
 	return nil

internal/serialization/serialization.go

@@ -86,7 +86,7 @@ func initPtr(dst reflect.Value) {
 }
 
 func ValidateWithFieldTags(s any) gperr.Error {
-	errs := gperr.NewBuilder()
+	var errs gperr.Builder
 	err := validate.Struct(s)
 	var valErrs validator.ValidationErrors
 	if errors.As(err, &valErrs) {
@@ -302,7 +302,7 @@ func mapUnmarshalValidate(src SerializedObject, dstV reflect.Value, checkValidat
 	// convert target fields to lower no-snake
 	// then check if the field of data is in the target
 
-	errs := gperr.NewBuilder()
+	var errs gperr.Builder
 
 	switch dstV.Kind() {
 	case reflect.Struct, reflect.Interface:
@@ -457,7 +457,7 @@ func Convert(src reflect.Value, dst reflect.Value, checkValidateTag bool) gperr.
 		if dstT.Kind() != reflect.Slice {
 			return ErrUnsupportedConversion.Subject(dstT.String() + " to " + srcT.String())
 		}
-		sliceErrs := gperr.NewBuilder()
+		var sliceErrs gperr.Builder
 		i := 0
 		gi.ReflectInitSlice(dst, srcLen, srcLen)
 		for j, v := range src.Seq2() {
@@ -541,7 +541,7 @@ func ConvertString(src string, dst reflect.Value) (convertible bool, convErr gpe
 		if !isMultiline && src[0] != '-' {
 			values := strutils.CommaSeperatedList(src)
 			gi.ReflectInitSlice(dst, len(values), len(values))
-			errs := gperr.NewBuilder()
+			var errs gperr.Builder
 			for i, v := range values {
 				_, err := ConvertString(v, dst.Index(i))
 				if err != nil {

internal/types/idlewatcher.go

@@ -76,7 +76,8 @@ func (c *IdlewatcherConfig) Validate() gperr.Error {
 		c.valErr = nil
 		return nil
 	}
-	errs := gperr.NewBuilder()
+
+	var errs gperr.Builder
 	errs.AddRange(
 		c.validateProvider(),
 		c.validateTimeouts(),