fixed initialism errors in accordance with golang conventions in 7 files. (#24287)

server/channels/utils/file.go

@@ -8,7 +8,7 @@ import (
 	"io"
 )
 
-var SizeLimitExceeded = errors.New("Size limit exceeded")
+var ErrSizeLimitExceeded = errors.New("size limit exceeded")
 
 type LimitedReaderWithError struct {
 	limitedReader *io.LimitedReader
@@ -23,7 +23,7 @@ func NewLimitedReaderWithError(reader io.Reader, maxBytes int64) *LimitedReaderW
 func (l *LimitedReaderWithError) Read(p []byte) (int, error) {
 	n, err := l.limitedReader.Read(p)
 	if l.limitedReader.N <= 0 && err == io.EOF {
-		return n, SizeLimitExceeded
+		return n, ErrSizeLimitExceeded
 	}
 	return n, err
 }

server/channels/utils/file_test.go

@@ -51,7 +51,7 @@ func TestLimitedReaderWithError(t *testing.T) {
 		buf := make([]byte, moreThanMaxBytes)
 		_, err = io.ReadFull(lr, buf)
 		require.Error(t, err)
-		require.Equal(t, SizeLimitExceeded, err)
+		require.Equal(t, ErrSizeLimitExceeded, err)
 	})
 
 	t.Run("multiple small reads, total larger than max size", func(t *testing.T) {
@@ -71,6 +71,6 @@ func TestLimitedReaderWithError(t *testing.T) {
 		// lets do it again
 		_, err = io.ReadFull(lr, buf)
 		require.Error(t, err)
-		require.Equal(t, SizeLimitExceeded, err)
+		require.Equal(t, ErrSizeLimitExceeded, err)
 	})
 }