pkg/infra: Check errors (#19705)

* pkg/infra: Check errors

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

* pkg/infra: Handle errors

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

* Update pkg/infra/usagestats/usage_stats.go

Co-Authored-By: Marcus Efraimsson <marcus.efraimsson@gmail.com>

pkg/infra/log/file.go

@@ -209,20 +209,23 @@ func (w *FileLogWriter) DoRotate() error {
 
 func (w *FileLogWriter) deleteOldLog() {
 	dir := filepath.Dir(w.Filename)
-	filepath.Walk(dir, func(path string, info os.FileInfo, err error) (returnErr error) {
+	err := filepath.Walk(dir, func(path string, info os.FileInfo, err error) (returnErr error) {
 		defer func() {
 			if r := recover(); r != nil {
 				returnErr = fmt.Errorf("Unable to delete old log '%s', error: %+v", path, r)
 			}
 		}()
 
-		if !info.IsDir() && info.ModTime().Unix() < (time.Now().Unix()-60*60*24*w.Maxdays) {
-			if strings.HasPrefix(filepath.Base(path), filepath.Base(w.Filename)) {
-				os.Remove(path)
-			}
+		if !info.IsDir() && info.ModTime().Unix() < (time.Now().Unix()-60*60*24*w.Maxdays) &&
+			strings.HasPrefix(filepath.Base(path), filepath.Base(w.Filename)) {
+			returnErr = os.Remove(path)
+			return
 		}
-		return returnErr
+		return
 	})
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "FileLogWriter(%q): %s\n", w.Filename, err)
+	}
 }
 
 // destroy file logger, close file writer.
@@ -234,7 +237,9 @@ func (w *FileLogWriter) Close() {
 // there are no buffering messages in file logger in memory.
 // flush file means sync file from disk.
 func (w *FileLogWriter) Flush() {
-	w.mw.fd.Sync()
+	if err := w.mw.fd.Sync(); err != nil {
+		fmt.Fprintf(os.Stderr, "FileLogWriter(%q): %s\n", w.Filename, err)
+	}
 }
 
 // Reload file logger

pkg/infra/log/log.go

@@ -209,7 +209,11 @@ func ReadLoggingConfig(modes []string, logsPath string, cfg *ini.File) {
 			handler = log15.StreamHandler(os.Stdout, format)
 		case "file":
 			fileName := sec.Key("file_name").MustString(filepath.Join(logsPath, "grafana.log"))
-			os.MkdirAll(filepath.Dir(fileName), os.ModePerm)
+			dpath := filepath.Dir(fileName)
+			if err := os.MkdirAll(dpath, os.ModePerm); err != nil {
+				Root.Error("Failed to create directory", "dpath", dpath, "err", err)
+				break
+			}
 			fileHandler := NewFileWriter()
 			fileHandler.Filename = fileName
 			fileHandler.Format = format
@@ -218,7 +222,10 @@ func ReadLoggingConfig(modes []string, logsPath string, cfg *ini.File) {
 			fileHandler.Maxsize = 1 << uint(sec.Key("max_size_shift").MustInt(28))
 			fileHandler.Daily = sec.Key("daily_rotate").MustBool(true)
 			fileHandler.Maxdays = sec.Key("max_days").MustInt64(7)
-			fileHandler.Init()
+			if err := fileHandler.Init(); err != nil {
+				Root.Error("Failed to create directory", "dpath", dpath, "err", err)
+				break
+			}
 
 			loggersToClose = append(loggersToClose, fileHandler)
 			loggersToReload = append(loggersToReload, fileHandler)

pkg/infra/metrics/graphitebridge/graphite_test.go

@@ -547,9 +547,15 @@ func newMockGraphite(port string) (*mockGraphite, error) {
 		conn, err := ln.Accept()
 		if err != nil {
 			errc <- err
+			return
 		}
+
 		var b bytes.Buffer
-		io.Copy(&b, conn)
+		if _, err := io.Copy(&b, conn); err != nil {
+			errc <- err
+			return
+		}
+
 		readc <- b.String()
 	}()
 

pkg/infra/remotecache/database_storage_test.go

@@ -32,10 +32,12 @@ func TestDatabaseStorageGarbageCollection(t *testing.T) {
 	assert.Equal(t, err, nil)
 
 	// insert object that should never expire
-	db.Set("key4", obj, 0)
+	err = db.Set("key4", obj, 0)
+	assert.Equal(t, err, nil)
 
 	getTime = time.Now
-	db.Set("key5", obj, 1000*time.Second)
+	err = db.Set("key5", obj, 1000*time.Second)
+	assert.Equal(t, err, nil)
 
 	//run GC
 	db.internalRunGC()

pkg/infra/remotecache/remotecache_test.go

@@ -7,6 +7,7 @@ import (
 	"github.com/grafana/grafana/pkg/services/sqlstore"
 	"github.com/grafana/grafana/pkg/setting"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 type CacheableStruct struct {
@@ -29,19 +30,17 @@ func createTestClient(t *testing.T, opts *setting.RemoteCacheOptions, sqlstore *
 	}
 
 	err := dc.Init()
-	if err != nil {
-		t.Fatalf("failed to init client for test. error: %v", err)
-	}
+	require.Nil(t, err, "Failed to init client for test")
 
 	return dc
 }
 
 func TestCachedBasedOnConfig(t *testing.T) {
-
 	cfg := setting.NewCfg()
-	cfg.Load(&setting.CommandLineArgs{
+	err := cfg.Load(&setting.CommandLineArgs{
 		HomePath: "../../../",
 	})
+	require.Nil(t, err, "Failed to load config")
 
 	client := createTestClient(t, cfg.RemoteCacheOptions, sqlstore.InitTestDB(t))
 	runTestsForClient(t, client)

pkg/infra/tracing/tracing.go

@@ -38,7 +38,7 @@ func (ts *TracingService) Init() error {
 	ts.parseSettings()
 
 	if ts.enabled {
-		ts.initGlobalTracer()
+		return ts.initGlobalTracer()
 	}
 
 	return nil

pkg/infra/usagestats/usage_stats.go

@@ -151,7 +151,11 @@ func (uss *UsageStatsService) sendUsageStats(oauthProviders map[string]bool) {
 	data := bytes.NewBuffer(out)
 
 	client := http.Client{Timeout: 5 * time.Second}
-	go client.Post(usageStatsURL, "application/json", data)
+	go func() {
+		if _, err := client.Post(usageStatsURL, "application/json", data); err != nil {
+			metricsLogger.Error("Failed to send usage stats", "err", err)
+		}
+	}()
 }
 
 func (uss *UsageStatsService) updateTotalStats() {