WIP

logger.go

@@ -94,13 +94,13 @@ func (lf *LogFile) truncate() error {
 
 func prettyByteSize(b int64) string {
 	bf := float64(b)
-	for _, unit := range []string{"", "K", "M", "G", "T", "P", "E", "Z"} {
+	for _, unit := range []string{"", "K", "M", "G", "T", "P"} {
 		if math.Abs(bf) < 1024.0 {
 			return fmt.Sprintf("%3.1f%sB", bf, unit)
 		}
 		bf /= 1024.0
 	}
-	return fmt.Sprintf("%.1fYB", bf)
+	return fmt.Sprintf("%.1fEB", bf)
 }
 
 func compressOldFile(fname string) error {

logger_test.go

@@ -2,7 +2,10 @@ package main
 
 import (
 	"fmt"
+	"os"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func TestTruncate(t *testing.T) {
@@ -11,14 +14,123 @@ func TestTruncate(t *testing.T) {
 	mkDirForTest(t, fmt.Sprintf("%s/tmp", tmpDir))
 	rulesJsonFp := "testData/app_over_size.log"
 
-	expected := fmt.Sprintf("%s/tmp/app.log", tmpDir)
+	tmpLf := fmt.Sprintf("%s/tmp/app.log", tmpDir)
 
-	cpFileForTest(t, rulesJsonFp, expected)
+	cpFileForTest(t, rulesJsonFp, tmpLf)
 
-	cfg := &LogFile{
-		path: expected,
+	lf := &LogFile{
+		path: tmpLf,
 	}
 
+	lf.path = tmpLf
 	// Continue from here
+	isEmpty := isFileEmpty(t, tmpLf)
+	assert.Equal(t, isEmpty, false)
 
+	err := lf.truncate()
+	assert.Equal(t, err, nil)
+	isEmpty = isFileEmpty(t, tmpLf)
+	assert.Equal(t, isEmpty, true)
+}
+
+func TestMakeCopyTo(t *testing.T) {
+	tmpDir := t.TempDir()
+
+	mkDirForTest(t, fmt.Sprintf("%s/tmp", tmpDir))
+	rulesJsonFp := "testData/app_over_size.log"
+
+	tmpLf := fmt.Sprintf("%s/tmp/app.log", tmpDir)
+
+	cpFileForTest(t, rulesJsonFp, tmpLf)
+
+	newLocation := fmt.Sprintf("%s/tmp/app.1.log", tmpDir)
+
+	lf := &LogFile{
+		path: tmpLf,
+	}
+
+	lf.path = tmpLf
+
+	isEmpty := isFileEmpty(t, tmpLf)
+	assert.Equal(t, isEmpty, false)
+
+	err := lf.makeCopyTo(newLocation)
+	assert.Equal(t, err, nil)
+	isEmpty = isFileEmpty(t, tmpLf)
+	assert.Equal(t, isEmpty, false)
+	ok := areFilesTheSame(t, lf.path, newLocation)
+	assert.Equal(t, ok, true)
+}
+
+func TestPrettyByteSize(t *testing.T) {
+	tests := map[string]struct {
+		input int
+		want  string
+	}{
+		"KB": {input: 5675, want: "5.5KB"},
+		"MB": {input: 7060600, want: "6.7MB"},
+		"GB": {input: 8000000000, want: "7.5GB"},
+		"TB": {input: 1300007000000, want: "1.2TB"},
+		"EB": {input: 1300007000000000000, want: "1.1EB"},
+	}
+
+	for name, tc := range tests {
+		t.Run(name, func(t *testing.T) {
+			got := prettyByteSize(int64(tc.input))
+			assert.Equal(t, got, tc.want)
+		})
+	}
+}
+
+func TestCompressFile(t *testing.T) {
+	tmpDir := t.TempDir()
+
+	mkDirForTest(t, fmt.Sprintf("%s/tmp", tmpDir))
+	rulesJsonFp := "testData/app_over_size.log"
+
+	tmpLf := fmt.Sprintf("%s/tmp/app.log", tmpDir)
+
+	cpFileForTest(t, rulesJsonFp, tmpLf)
+
+	expected := fmt.Sprintf("%s/tmp/app.log.gz", tmpDir)
+
+	err := compressOldFile(tmpLf)
+	assert.Equal(t, err, nil)
+	exists := doesFileExist(tmpLf)
+	assert.Equal(t, exists, false)
+	exists = doesFileExist(expected)
+	assert.Equal(t, exists, true)
+}
+
+func TestRotate(t *testing.T) {
+	tmpDir := t.TempDir()
+
+	mkDirForTest(t, fmt.Sprintf("%s/tmp", tmpDir))
+	rulesJsonFp := "testData/app_over_size.log"
+
+	tmpLf := fmt.Sprintf("%s/tmp/app.log", tmpDir)
+
+	cpFileForTest(t, rulesJsonFp, tmpLf)
+
+	lf := &LogFile{
+		path: tmpLf,
+	}
+
+	fd, _ := os.Open(tmpLf)
+	lf.handle = fd
+
+	isEmpty := isFileEmpty(t, tmpLf)
+	assert.Equal(t, isEmpty, false)
+	err := lf.rotate(true)
+	assert.Equal(t, err, nil)
+	exists := doesFileExist(tmpLf)
+	assert.Equal(t, exists, true)
+	isEmpty = isFileEmpty(t, tmpLf)
+	assert.Equal(t, isEmpty, true)
+
+	expected := walkMatch(t, tmpDir, "*.gz")
+	assert.NotEmpty(t, expected)
+	t.Logf("%+v", expected)
+
+	assert.NotEqual(t, lf.handle, fd)
 }

testUtils_test.go

@@ -1,11 +1,13 @@
 package main
 
 import (
+	"bytes"
 	"encoding/json"
 	"errors"
 	"io"
 	"io/fs"
 	"os"
+	"path/filepath"
 	"testing"
 )
 
@@ -81,6 +83,29 @@ func doesFileExist(name string) bool {
 	return err == nil
 }
 
+// Derived from here (https://stackoverflow.com/a/55300382)
+func walkMatch(t *testing.T, root, pattern string) []string {
+	var matches []string
+	err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if info.IsDir() {
+			return nil
+		}
+		if matched, err := filepath.Match(pattern, filepath.Base(path)); err != nil {
+			return err
+		} else if matched {
+			matches = append(matches, path)
+		}
+		return nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	return matches
+}
+
 // func doesFileExist(name string) bool {
 // 	_, err := os.Stat(name)
 // 	return !errors.Is(err, fs.ErrNotExist)
@@ -113,3 +138,72 @@ func isFileEmpty(t *testing.T, name string) bool {
 	}
 	return finfo.Size() < 1
 }
+
+// Derived from here (https://stackoverflow.com/a/73411967)
+func areFilesTheSame(t *testing.T, fp_1 string, fp_2 string) bool {
+	chunkSize := 4 * 1024
+
+	// shortcuts: check file metadata
+	finfo_1, err := os.Stat(fp_1)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	finfo_2, err := os.Stat(fp_2)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// are inputs are literally the same file?
+	if os.SameFile(finfo_1, finfo_2) {
+		return true
+	}
+
+	// do inputs at least have the same size?
+	if finfo_1.Size() != finfo_2.Size() {
+		return false
+	}
+
+	// long way: compare contents
+	fd_1, err := os.Open(fp_1)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	defer fd_1.Close()
+
+	fd_2, err := os.Open(fp_2)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer fd_2.Close()
+
+	bfd_1 := make([]byte, chunkSize)
+	bfd_2 := make([]byte, chunkSize)
+	for {
+		n1, err1 := io.ReadFull(fd_1, bfd_1)
+		n2, err2 := io.ReadFull(fd_2, bfd_2)
+
+		// https://pkg.go.dev/io#Reader
+		// > Callers should always process the n > 0 bytes returned
+		// > before considering the error err. Doing so correctly
+		// > handles I/O errors that happen after reading some bytes
+		// > and also both of the allowed EOF behaviors.
+
+		if !bytes.Equal(bfd_1[:n1], bfd_2[:n2]) {
+			return false
+		}
+
+		if (err1 == io.EOF && err2 == io.EOF) || (err1 == io.ErrUnexpectedEOF && err2 == io.ErrUnexpectedEOF) {
+			return true
+		}
+
+		// some other error, like a dropped network connection or a bad transfer
+		if err1 != nil {
+			t.Fatal(err1)
+		}
+		if err2 != nil {
+			t.Fatal(err2)
+		}
+	}
+}