small reorg, some improvements, readme updates

- fix hemtt config to copy example
- add measurements table in Readme
- ENTITY COUNTS
  - re add side tags
  - use `side group _x` for units and players
  - fix players_connected and add headless_clients
- get `_allUserInfos = allUsers apply {getUserInfo _x} select {count _x > 0};` from main loop and use in entity counts and player performance

extension/IFXMetrics/internal/influx/influx.go

@@ -0,0 +1,123 @@
+package influx
+
+import (
+	"context"
+	"time"
+
+	"github.com/indig0fox/IFXMetrics/internal/logger"
+	influxdb2 "github.com/influxdata/influxdb-client-go/v2"
+	"github.com/influxdata/influxdb-client-go/v2/api"
+	"github.com/influxdata/influxdb-client-go/v2/domain"
+	"github.com/kataras/iris/v12/x/errors"
+	"github.com/spf13/viper"
+)
+
+var InfluxClient influxdb2.Client
+var Connected bool = false
+var activeSettings *viper.Viper
+
+var writeAPIs = map[string]api.WriteAPI{}
+var writeAPIErrorChannels = map[string]<-chan error{}
+
+func Setup(
+	settings *viper.Viper,
+) error {
+	activeSettings = settings
+	// create influx client
+	InfluxClient = influxdb2.NewClientWithOptions(
+		activeSettings.GetString("influxdb.host"),
+		activeSettings.GetString("influxdb.token"),
+		influxdb2.DefaultOptions().SetFlushInterval(1000),
+	)
+
+	_, err := InfluxClient.Ping(context.Background())
+	if err != nil {
+		return err
+	}
+
+	Connected = true
+
+	// start error handler
+	go func() {
+		for {
+			for bucket, err := range writeAPIErrorChannels {
+				thisLog := logger.FileOnly.With().
+					Str("component", "influx").
+					Str("bucket", bucket).
+					Logger()
+
+				select {
+				case e := <-err:
+					thisLog.Error().Msg(e.Error())
+				default:
+					continue
+				}
+			}
+			time.Sleep(1 * time.Second)
+		}
+	}()
+	return nil
+}
+
+func WriteLine(
+	bucket string,
+	measurement string,
+	tags map[string]string,
+	fields map[string]interface{},
+) error {
+
+	if !Connected {
+		return errors.New("influxdb not connected")
+	}
+
+	if InfluxClient == nil {
+		return errors.New("influxdb client not initialized")
+	}
+
+	// check if bucket exists
+	b := InfluxClient.BucketsAPI()
+	_, err := b.FindBucketByName(context.Background(), bucket)
+	if err != nil {
+		// get organization
+		org, err := InfluxClient.OrganizationsAPI().FindOrganizationByName(
+			context.Background(),
+			activeSettings.GetString("influxdb.org"),
+		)
+		if err != nil {
+
+			return err
+		}
+		// create bucket
+		bucket, err := b.CreateBucketWithName(
+			context.Background(),
+			org,
+			bucket,
+			domain.RetentionRule{EverySeconds: 0},
+		)
+		if err != nil {
+
+			return err
+		}
+		logger.Log.Info().Msgf("created bucket %s", bucket.Name)
+		return err
+	}
+
+	if writeAPIs[bucket] == nil {
+		writeAPIs[bucket] = InfluxClient.WriteAPI(
+			activeSettings.GetString("influxdb.org"),
+			bucket,
+		)
+		writeAPIErrorChannels[bucket] = writeAPIs[bucket].Errors()
+	}
+
+	p := influxdb2.NewPoint(
+		measurement,
+		tags,
+		fields,
+		time.Now(),
+	)
+
+	writeAPIs[bucket].WritePoint(p)
+
+	return nil
+}