Preallocate slices of known length

* Correct misspelled words
* Remove unused code
* Break up very long lines into multiple lines
* lp.NewMessage -> lp.NewMetric

collectors/customCmdMetric.go

@@ -8,11 +8,10 @@
 package collectors
 
 import (
-	"bytes"
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io"
+	"log"
 	"os"
 	"os/exec"
 	"slices"
@@ -21,9 +20,7 @@ import (
 
 	cclog "github.com/ClusterCockpit/cc-lib/v2/ccLogger"
 	lp "github.com/ClusterCockpit/cc-lib/v2/ccMessage"
-
-	receivers "github.com/ClusterCockpit/cc-lib/v2/receivers"
-	lp2 "github.com/influxdata/line-protocol/v2/lineprotocol"
+	influx "github.com/influxdata/line-protocol"
 )
 
 const CUSTOMCMDPATH = `/home/unrz139/Work/cc-metric-collector/collectors/custom`
@@ -36,6 +33,8 @@ type CustomCmdCollectorConfig struct {
 
 type CustomCmdCollector struct {
 	metricCollector
+	handler  *influx.MetricHandler
+	parser   *influx.Parser
 	config   CustomCmdCollectorConfig
 	commands []string
 	files    []string
@@ -87,6 +86,9 @@ func (m *CustomCmdCollector) Init(config json.RawMessage) error {
 	if len(m.files) == 0 && len(m.commands) == 0 {
 		return errors.New("no metrics to collect")
 	}
+	m.handler = influx.NewMetricHandler()
+	m.parser = influx.NewParser(m.handler)
+	m.parser.SetTimeFunc(DefaultTime)
 	m.init = true
 	return nil
 }
@@ -100,83 +102,46 @@ func (m *CustomCmdCollector) Read(interval time.Duration, output chan lp.CCMessa
 		return
 	}
 	for _, cmd := range m.commands {
-		// Execute configured commands
-		cmdFields := strings.Fields(cmd)
-		command := exec.Command(cmdFields[0], cmdFields[1:]...)
-		stdout, _ := command.StdoutPipe()
-		errBuf := new(bytes.Buffer)
-		command.Stderr = errBuf
-
-		// Start command
-		if err := command.Start(); err != nil {
-			cclog.ComponentError(
-				m.name,
-				fmt.Sprintf("Read(): Failed to start command \"%s\": %v", command.String(), err),
-			)
-			return
-		}
-
-		// Read and decode influxDB line-protocol from command output
-		d := lp2.NewDecoder(stdout)
-		for d.Next() {
-			metric, err := receivers.DecodeInfluxMessage(d)
-			if err != nil {
-				cclog.ComponentError(
-					m.name,
-					fmt.Sprintf("Read(): Failed to decode influx Message: %v", err),
-				)
-				continue
-			}
-			if slices.Contains(m.config.ExcludeMetrics, metric.Name()) {
-				continue
-			}
-			output <- metric
-		}
-
-		// Wait for command end
+		cmdfields := strings.Fields(cmd)
+		command := exec.Command(cmdfields[0], cmdfields[1:]...)
 		if err := command.Wait(); err != nil {
-			errMsg, _ := io.ReadAll(errBuf)
-			cclog.ComponentError(
-				m.name,
-				fmt.Sprintf("Read(): Failed to wait for the end of command \"%s\": %v\n", command.String(), err),
-			)
-			cclog.ComponentError(
-				m.name,
-				fmt.Sprintf("Read(): command stderr: \"%s\"\n", strings.TrimSpace(string(errMsg))))
-			return
+			log.Print(err)
+			continue
+		}
+		stdout, err := command.Output()
+		if err != nil {
+			log.Print(err)
+			continue
+		}
+		cmdmetrics, err := m.parser.Parse(stdout)
+		if err != nil {
+			log.Print(err)
+			continue
+		}
+		for _, c := range cmdmetrics {
+			if slices.Contains(m.config.ExcludeMetrics, c.Name()) {
+				continue
+			}
+
+			output <- lp.FromInfluxMetric(c)
 		}
 	}
-	for _, filename := range m.files {
-		file, err := os.Open(filename)
+	for _, file := range m.files {
+		buffer, err := os.ReadFile(file)
 		if err != nil {
-			cclog.ComponentError(
-				m.name,
-				fmt.Sprintf("Read(): Failed to open file \"%s\": %v\n", filename, err),
-			)
+			log.Print(err)
+			return
 		}
-
-		// Read and decode influxDB line-protocol from file
-		d := lp2.NewDecoder(file)
-		for d.Next() {
-			metric, err := receivers.DecodeInfluxMessage(d)
-			if err != nil {
-				cclog.ComponentError(
-					m.name,
-					fmt.Sprintf("Read(): Failed to decode influx Message: %v", err),
-				)
+		fmetrics, err := m.parser.Parse(buffer)
+		if err != nil {
+			log.Print(err)
+			continue
+		}
+		for _, f := range fmetrics {
+			if slices.Contains(m.config.ExcludeMetrics, f.Name()) {
 				continue
 			}
-			if slices.Contains(m.config.ExcludeMetrics, metric.Name()) {
-				continue
-			}
-			output <- metric
-		}
-
-		if err := file.Close(); err != nil {
-			cclog.ComponentError(
-				m.name,
-				fmt.Sprintf("Read(): Failed to close file \"%s\": %v\n", filename, err),
-			)
+			output <- lp.FromInfluxMetric(f)
 		}
 	}
 }