Merge pull request #195 from safing/feature/modules-microtask-improve…

…ments

Microtasks Improvements and Module Status Export

api/endpoints.go

@@ -388,18 +388,18 @@ func (e *Endpoint) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		if eMethod != e.ReadMethod {
 			log.Tracer(r.Context()).Warningf(
 				"api: method %q does not match required read method %q%s",
-				" - this will be an error and abort the request in the future",
 				r.Method,
 				e.ReadMethod,
+				" - this will be an error and abort the request in the future",
 			)
 		}
 	} else {
 		if eMethod != e.WriteMethod {
 			log.Tracer(r.Context()).Warningf(
 				"api: method %q does not match required write method %q%s",
-				" - this will be an error and abort the request in the future",
 				r.Method,
-				e.ReadMethod,
+				e.WriteMethod,
+				" - this will be an error and abort the request in the future",
 			)
 		}
 	}

api/endpoints_modules.go

@@ -3,9 +3,21 @@ package api
 import (
 	"errors"
 	"fmt"
+
+	"github.com/safing/portbase/modules"
 )
 
 func registerModulesEndpoints() error {
+	if err := RegisterEndpoint(Endpoint{
+		Path:        "modules/status",
+		Read:        PermitUser,
+		StructFunc:  getStatusfunc,
+		Name:        "Get Module Status",
+		Description: "Returns status information of all modules.",
+	}); err != nil {
+		return err
+	}
+
 	if err := RegisterEndpoint(Endpoint{
 		Path:        "modules/{moduleName:.+}/trigger/{eventName:.+}",
 		Write:       PermitSelf,
@@ -19,6 +31,14 @@ func registerModulesEndpoints() error {
 	return nil
 }
 
+func getStatusfunc(ar *Request) (i interface{}, err error) {
+	status := modules.GetStatus()
+	if status == nil {
+		return nil, errors.New("modules not yet initialized")
+	}
+	return status, nil
+}
+
 func triggerEvent(ar *Request) (msg string, err error) {
 	// Get parameters.
 	moduleName := ar.URLVars["moduleName"]

log/input.go

@@ -93,7 +93,10 @@ func log(level Severity, msg string, tracer *ContextTracer) {
 
 	// wake up writer if necessary
 	if logsWaitingFlag.SetToIf(false, true) {
-		logsWaiting <- struct{}{}
+		select {
+		case logsWaiting <- struct{}{}:
+		default:
+		}
 	}
 }
 

log/logging.go

@@ -109,7 +109,7 @@ var (
 	pkgLevels       = make(map[string]Severity)
 	pkgLevelsLock   sync.Mutex
 
-	logsWaiting     = make(chan struct{}, 4)
+	logsWaiting     = make(chan struct{}, 1)
 	logsWaitingFlag = abool.NewBool(false)
 
 	shutdownFlag      = abool.NewBool(false)

modules/export.go

@@ -0,0 +1,117 @@
+package modules
+
+import "sync/atomic"
+
+// Status holds an exported status summary of the modules system.
+type Status struct {
+	Modules map[string]*ModuleStatus
+	Total   struct {
+		Workers         int
+		Tasks           int
+		MicroTasks      int
+		CtrlFuncRunning int
+	}
+	Config struct {
+		MicroTasksThreshhold int
+		MediumPriorityDelay  string
+		LowPriorityDelay     string
+	}
+}
+
+// ModuleStatus holds an exported status summary of one module.
+type ModuleStatus struct { //nolint:maligned
+	Enabled bool
+
+	Status      string
+	FailureType string
+	FailureID   string
+	FailureMsg  string
+
+	Workers         int
+	Tasks           int
+	MicroTasks      int
+	CtrlFuncRunning bool
+}
+
+// GetStatus exports status data from the module system.
+func GetStatus() *Status {
+	// Check if modules have been initialized.
+	if modulesLocked.IsNotSet() {
+		return nil
+	}
+
+	// Create new status.
+	status := &Status{
+		Modules: make(map[string]*ModuleStatus, len(modules)),
+	}
+
+	// Add config.
+	status.Config.MicroTasksThreshhold = int(atomic.LoadInt32(microTasksThreshhold))
+	status.Config.MediumPriorityDelay = defaultMediumPriorityMaxDelay.String()
+	status.Config.LowPriorityDelay = defaultLowPriorityMaxDelay.String()
+
+	// Gather status data.
+	for name, module := range modules {
+		moduleStatus := &ModuleStatus{
+			Enabled:         module.Enabled(),
+			Status:          getStatusName(module.Status()),
+			Workers:         int(atomic.LoadInt32(module.workerCnt)),
+			Tasks:           int(atomic.LoadInt32(module.taskCnt)),
+			MicroTasks:      int(atomic.LoadInt32(module.microTaskCnt)),
+			CtrlFuncRunning: module.ctrlFuncRunning.IsSet(),
+		}
+
+		// Add failure status.
+		failureStatus, failureID, failureMsg := module.FailureStatus()
+		moduleStatus.FailureType = getFailureStatusName(failureStatus)
+		moduleStatus.FailureID = failureID
+		moduleStatus.FailureMsg = failureMsg
+
+		// Add to total counts.
+		status.Total.Workers += moduleStatus.Workers
+		status.Total.Tasks += moduleStatus.Tasks
+		status.Total.MicroTasks += moduleStatus.MicroTasks
+		if moduleStatus.CtrlFuncRunning {
+			status.Total.CtrlFuncRunning++
+		}
+
+		// Add to export.
+		status.Modules[name] = moduleStatus
+	}
+
+	return status
+}
+
+func getStatusName(status uint8) string {
+	switch status {
+	case StatusDead:
+		return "dead"
+	case StatusPreparing:
+		return "preparing"
+	case StatusOffline:
+		return "offline"
+	case StatusStopping:
+		return "stopping"
+	case StatusStarting:
+		return "starting"
+	case StatusOnline:
+		return "online"
+	default:
+		return "unknown"
+	}
+}
+
+func getFailureStatusName(status uint8) string {
+	switch status {
+	case FailureNone:
+		return ""
+	case FailureHint:
+		return "hint"
+	case FailureWarning:
+		return "warning"
+	case FailureError:
+		return "error"
+	default:
+		return "unknown"
+	}
+}

modules/microtasks.go

@@ -30,7 +30,8 @@ const (
 func init() {
 	var microTasksVal int32
 	microTasks = &microTasksVal
-	var microTasksThreshholdVal int32
+
+	microTasksThreshholdVal := int32(runtime.GOMAXPROCS(0) * 2)
 	microTasksThreshhold = &microTasksThreshholdVal
 }
 

modules/start.go

@@ -4,7 +4,6 @@ import (
 	"errors"
 	"fmt"
 	"os"
-	"runtime"
 
 	"github.com/tevino/abool"
 
@@ -36,7 +35,6 @@ func Start() error {
 	defer mgmtLock.Unlock()
 
 	// start microtask scheduler
-	SetMaxConcurrentMicroTasks(runtime.GOMAXPROCS(0))
 	go microTaskScheduler()
 
 	// inter-link modules