major change of websocket dbmHandler structure

dbm/dbmHandler.go

@@ -0,0 +1,197 @@
+package dbm
+
+import (
+	"bufio"
+	"context"
+	"encoding/json"
+	"fmt"
+	"os"
+	"runtime"
+	"sync"
+	"time"
+
+	"github.com/tecamino/tecamino-logger/logging"
+	"github.com/zuadi/tecamino-dbm/args"
+	"github.com/zuadi/tecamino-dbm/models"
+	serverModels "github.com/zuadi/tecamino-dbm/server/models"
+)
+
+type DBMHandler struct {
+	filePath string
+	DB       models.Datapoint
+	Clients  serverModels.Clients
+	sync.RWMutex
+	Log *logging.Logger
+	arg *args.Args
+}
+
+// initialze new Database Manager
+// it will call cli arguments
+func NewDbmHandler(a *args.Args) (*DBMHandler, error) {
+
+	logger, err := logging.NewLogger("dbmServer.log", &logging.Config{
+		MaxSize:     1,
+		MaxBackup:   3,
+		MaxAge:      28,
+		Debug:       a.Debug,
+		TerminalOut: true,
+	})
+
+	if err != nil {
+		return nil, err
+	}
+	logger.Info("main", "start dma")
+
+	// Initialize dtabase manager handler
+	dmaHandler := DBMHandler{
+		arg:      a,
+		filePath: fmt.Sprintf("%s/%s.dma", a.RootDir, a.DMAFile),
+		Log:      logger,
+		Clients:  serverModels.NewClients(),
+	}
+
+	// initialize system datapoint and periodically update it
+	if err := dmaHandler.AddSystemDps(); err != nil {
+		return nil, err
+	}
+
+	// check if dtabase file exists to load data
+	if _, err := os.Stat(dmaHandler.filePath); err == nil {
+
+		f, err := os.Open(dmaHandler.filePath)
+		if err != nil {
+			return nil, err
+		}
+		defer f.Close()
+
+		// read in dtaabase file content
+		scanner := bufio.NewScanner(f)
+
+		for scanner.Scan() {
+			dp := models.Datapoint{}
+			err = json.Unmarshal(scanner.Bytes(), &dp)
+			if err != nil {
+				return nil, err
+			}
+			dmaHandler.ImportDatapoints(&dp)
+		}
+	}
+
+	return &dmaHandler, nil
+}
+
+func (d *DBMHandler) SaveDb() (err error) {
+	f, err := os.OpenFile(d.filePath, os.O_CREATE|os.O_RDWR|os.O_TRUNC, 0666)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	for _, dp := range d.DB.GetAllDatapoints(0) {
+		b, er := json.Marshal(dp)
+		if er != nil {
+			return er
+		}
+
+		_, err = f.Write(b)
+		if err != nil {
+			return
+		}
+		_, err = f.Write([]byte("\n"))
+		if err != nil {
+			return
+		}
+	}
+	return
+}
+
+func (d *DBMHandler) CreateDatapoint(typ models.Type, value any, right models.Rights, path string) error {
+	if err := d.DB.CreateDatapoint(typ, value, right, path); err != nil {
+		return err
+	}
+	dp := d.QueryDatapoints(1, "System:Datapoints")
+	d.UpdateDatapointValue("System:Datapoints", dp[0].GetValueUint64()+1)
+	return nil
+}
+
+func (d *DBMHandler) ImportDatapoints(dps ...*models.Datapoint) error {
+	for _, dp := range dps {
+		err := d.DB.ImportDatapoint(dp, dp.Path)
+		if err != nil {
+			return err
+		}
+		dp := d.QueryDatapoints(1, "System:Datapoints")
+		d.UpdateDatapointValue("System:Datapoints", dp[0].GetValueUint64()+1)
+	}
+	return nil
+}
+
+func (d *DBMHandler) UpdateDatapointValue(path string, value any) error {
+	return d.DB.UpdateDatapointValue(value, path)
+}
+
+func (d *DBMHandler) RemoveDatapoint(path string) error {
+	if err := d.DB.RemoveDatapoint(path); err != nil {
+		return err
+	}
+	dp := d.QueryDatapoints(1, "System:Datapoints")
+	d.UpdateDatapointValue("System:Datapoints", dp[0].GetValueUint64()+1)
+	return nil
+}
+
+func (d *DBMHandler) QueryDatapoints(depth int, key string) []*models.Datapoint {
+	return d.DB.QueryDatapoints(depth, key)
+}
+
+func (d *DBMHandler) AddSystemDps() (err error) {
+	tim := "System:Time"
+	memory := "System:UsedMemory"
+	var m runtime.MemStats
+	var mOld uint64
+	var tOld int64
+
+	err = d.DB.CreateDatapoint(models.LOU, 0, models.Read, "System:Datapoints")
+	if err != nil {
+		d.Log.Error("dmb.Handler.AddSystemDps.CreateDatapoint", err.Error())
+		return
+	}
+
+	err = d.DB.CreateDatapoint(models.STR, nil, models.Read, tim)
+	if err != nil {
+		d.Log.Error("dmb.Handler.AddSystemDps.CreateDatapoint", err.Error())
+		return
+	}
+	err = d.DB.CreateDatapoint(models.STR, nil, models.Read, memory)
+	if err != nil {
+		d.Log.Error("dmb.Handler.AddSystemDps.CreateDatapoint", err.Error())
+		return
+	}
+
+	go func() {
+
+		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Minute)
+		defer cancel()
+
+		for {
+			t := time.Now().UnixMilli()
+			if tOld != t {
+				if er := d.DB.UpdateDatapointValue(t, tim); er != nil {
+					d.Log.Error("dmb.Handler.AddSystemDps.UpdateDatapointValue", er.Error())
+				}
+				d.Publish(ctx, OnChange, tim, t)
+				tOld = t
+			}
+			runtime.ReadMemStats(&m)
+			if m.Sys != mOld {
+				mem := fmt.Sprintf("%.2f MB", float64(m.Sys)/1024/1024)
+				if er := d.DB.UpdateDatapointValue(mem, memory); er != nil {
+					d.Log.Error("dmb.Handler.AddSystemDps.UpdateDatapointValue", er.Error())
+				}
+				d.Publish(ctx, OnChange, memory, mem)
+				mOld = m.Sys
+			}
+			time.Sleep(1 * time.Second)
+		}
+	}()
+	return
+}