fix: [Telemetry] Prevent telemetry connect if no binary path (#1883)

* Prevent telemetry connect if no binary path

* agnostic calls, addressing comments

* agnostic calls, addressing comments

* Correcting flow, lint

* Restoring aiwrapper

* lint error 113 cleanup

* addressing comments

* cleaning up telemetry folder error calls

* addressing comments

* addressing comments

* addressing comments

---------

Co-authored-by: jpayne3506 <johnpayne@microsoft.com>
Co-authored-by: tamilmani1989 <tamanoha@microsoft.com>

telemetry/aiwrapper.go

@@ -2,16 +2,18 @@
 package telemetry
 
 import (
-	"fmt"
+	"errors"
+
 	"github.com/Azure/azure-container-networking/aitelemetry"
 	"github.com/Azure/azure-container-networking/log"
 )
 
 var (
-	aiMetadata     string
-	th             aitelemetry.TelemetryHandle
-	gDisableTrace  bool
-	gDisableMetric bool
+	aiMetadata           string
+	th                   aitelemetry.TelemetryHandle
+	gDisableTrace        bool
+	gDisableMetric       bool
+	ErrTelemetryDisabled = errors.New("telemetry is disabled")
 )
 
 const (
@@ -24,7 +26,7 @@ func CreateAITelemetryHandle(aiConfig aitelemetry.AIConfig, disableAll, disableM
 
 	if disableAll {
 		log.Printf("Telemetry is disabled")
-		return fmt.Errorf("Telmetry disabled")
+		return ErrTelemetryDisabled
 	}
 
 	th, err = aitelemetry.NewAITelemetry("", aiMetadata, aiConfig)

telemetry/telemetry_linux.go

@@ -4,13 +4,13 @@
 package telemetry
 
 import (
-	"fmt"
 	"os/exec"
 	"runtime"
 	"strings"
 	"syscall"
 
 	"github.com/Azure/azure-container-networking/platform"
+	"github.com/pkg/errors"
 )
 
 // Memory Info structure.
@@ -36,7 +36,7 @@ func getMemInfo() (*MemInfo, error) {
 
 	err := syscall.Sysinfo(info)
 	if err != nil {
-		return nil, fmt.Errorf("Sysinfo failed due to %v", err)
+		return nil, errors.Wrapf(err, "Sysinfo failed due to ")
 	}
 
 	unit := uint64(info.Unit) * MB // MB
@@ -51,7 +51,7 @@ func getDiskInfo(path string) (*DiskInfo, error) {
 
 	err := syscall.Statfs(path, &fs)
 	if err != nil {
-		return nil, fmt.Errorf("Statfs call failed with error %v", err)
+		return nil, errors.Wrapf(err, "Statfs call failed with error ")
 	}
 
 	total := fs.Blocks * uint64(fs.Bsize) / MB

telemetry/telemetrybuffer.go

@@ -7,7 +7,6 @@ import (
 	"bufio"
 	"context"
 	"encoding/json"
-	"fmt"
 	"net"
 	"os"
 	"path/filepath"
@@ -305,9 +304,14 @@ func ReadConfigFile(filePath string) (TelemetryConfig, error) {
 func (tb *TelemetryBuffer) ConnectToTelemetryService(telemetryNumRetries, telemetryWaitTimeInMilliseconds int) {
 	path, dir := getTelemetryServiceDirectory()
 	args := []string{"-d", dir}
+
 	for attempt := 0; attempt < 2; attempt++ {
 		if err := tb.Connect(); err != nil {
 			log.Logf("Connection to telemetry socket failed: %v", err)
+			if _, exists := os.Stat(path); exists != nil {
+				log.Logf("Skip starting telemetry service as file didn't exist")
+				return
+			}
 			tb.Cleanup(FdName)
 			StartTelemetryService(path, args)
 			WaitForTelemetrySocket(telemetryNumRetries, time.Duration(telemetryWaitTimeInMilliseconds))
@@ -319,20 +323,17 @@ func (tb *TelemetryBuffer) ConnectToTelemetryService(telemetryNumRetries, teleme
 	}
 }
 
+// getTelemetryServiceDirectory - check CNI install directory and Executable location for telemetry binary
 func getTelemetryServiceDirectory() (path string, dir string) {
-	path = fmt.Sprintf("%v/%v", CniInstallDir, TelemetryServiceProcessName)
-	if exists, _ := platform.CheckIfFileExists(path); !exists {
+	path = filepath.Join(CniInstallDir, TelemetryServiceProcessName)
+
+	if _, exists := os.Stat(path); exists != nil {
 		ex, _ := os.Executable()
 		exDir := filepath.Dir(ex)
-		path = fmt.Sprintf("%v/%v", exDir, TelemetryServiceProcessName)
-		if exists, _ = platform.CheckIfFileExists(path); !exists {
-			log.Logf("Skip starting telemetry service as file didn't exist")
-			return
-		}
+		path = filepath.Join(exDir, TelemetryServiceProcessName)
 		dir = exDir
 	} else {
 		dir = CniInstallDir
 	}
-
 	return
 }