badguardhome/querylog/qlog_file_test.go

package querylog

import (
	"encoding/binary"
	"io"
	"io/ioutil"
	"net"
	"os"
	"strings"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
)

func TestQLogFileEmpty(t *testing.T) {
	testDir := prepareTestDir()
	defer func() { _ = os.RemoveAll(testDir) }()
	testFile := prepareTestFile(testDir, 0)

	// create the new QLogFile instance
	q, err := NewQLogFile(testFile)
	assert.Nil(t, err)
	assert.NotNil(t, q)

	// seek to the start
	pos, err := q.SeekStart()
	assert.Nil(t, err)
	assert.Equal(t, int64(0), pos)

	// try reading anyway
	line, err := q.ReadNext()
	assert.Equal(t, io.EOF, err)
	assert.Equal(t, "", line)
}

func TestQLogFileLarge(t *testing.T) {
	// should be large enough
	count := 50000

	testDir := prepareTestDir()
	defer func() { _ = os.RemoveAll(testDir) }()
	testFile := prepareTestFile(testDir, count)

	// create the new QLogFile instance
	q, err := NewQLogFile(testFile)
	assert.Nil(t, err)
	assert.NotNil(t, q)

	// seek to the start
	pos, err := q.SeekStart()
	assert.Nil(t, err)
	assert.NotEqual(t, int64(0), pos)

	read := 0
	var line string
	for err == nil {
		line, err = q.ReadNext()
		if err == nil {
			assert.True(t, len(line) > 0)
			read += 1
		}
	}

	assert.Equal(t, count, read)
	assert.Equal(t, io.EOF, err)
}

func TestQLogFileSeekLargeFile(t *testing.T) {
	// more or less big file
	count := 10000

	testDir := prepareTestDir()
	defer func() { _ = os.RemoveAll(testDir) }()
	testFile := prepareTestFile(testDir, count)

	// create the new QLogFile instance
	q, err := NewQLogFile(testFile)
	assert.Nil(t, err)
	assert.NotNil(t, q)

	// CASE 1: NOT TOO OLD LINE
	testSeekLine(t, q, 300)

	// CASE 2: OLD LINE
	testSeekLine(t, q, count-300)

	// CASE 3: FIRST LINE
	testSeekLine(t, q, 0)

	// CASE 4: LAST LINE
	testSeekLine(t, q, count)

	// CASE 5: Seek non-existent (too low)
	_, err = q.Seek(123)
	assert.NotNil(t, err)

	// CASE 6: Seek non-existent (too high)
	ts, _ := time.Parse(time.RFC3339, "2100-01-02T15:04:05Z07:00")
	_, err = q.Seek(uint64(ts.UnixNano()))
	assert.NotNil(t, err)
}

func TestQLogFileSeekSmallFile(t *testing.T) {
	// more or less big file
	count := 10

	testDir := prepareTestDir()
	defer func() { _ = os.RemoveAll(testDir) }()
	testFile := prepareTestFile(testDir, count)

	// create the new QLogFile instance
	q, err := NewQLogFile(testFile)
	assert.Nil(t, err)
	assert.NotNil(t, q)

	// CASE 1: NOT TOO OLD LINE
	testSeekLine(t, q, 2)

	// CASE 2: OLD LINE
	testSeekLine(t, q, count-2)

	// CASE 3: FIRST LINE
	testSeekLine(t, q, 0)

	// CASE 4: LAST LINE
	testSeekLine(t, q, count)

	// CASE 5: Seek non-existent (too low)
	_, err = q.Seek(123)
	assert.NotNil(t, err)

	// CASE 6: Seek non-existent (too high)
	ts, _ := time.Parse(time.RFC3339, "2100-01-02T15:04:05Z07:00")
	_, err = q.Seek(uint64(ts.UnixNano()))
	assert.NotNil(t, err)
}

func testSeekLine(t *testing.T, q *QLogFile, lineNumber int) {
	line, err := getQLogLine(q, lineNumber)
	assert.Nil(t, err)
	ts := q.readTimestamp(line)
	assert.NotEqual(t, uint64(0), ts)

	// try seeking to that line now
	pos, err := q.Seek(ts)
	assert.Nil(t, err)
	assert.NotEqual(t, int64(0), pos)

	testLine, err := q.ReadNext()
	assert.Nil(t, err)
	assert.Equal(t, line, testLine)
}

func getQLogLine(q *QLogFile, lineNumber int) (string, error) {
	_, err := q.SeekStart()
	if err != nil {
		return "", err
	}

	for i := 1; i < lineNumber; i++ {
		_, err := q.ReadNext()
		if err != nil {
			return "", err
		}
	}
	return q.ReadNext()
}

// Check adding and loading (with filtering) entries from disk and memory
func TestQLogFile(t *testing.T) {
	testDir := prepareTestDir()
	defer func() { _ = os.RemoveAll(testDir) }()
	testFile := prepareTestFile(testDir, 2)

	// create the new QLogFile instance
	q, err := NewQLogFile(testFile)
	assert.Nil(t, err)
	assert.NotNil(t, q)

	// seek to the start
	pos, err := q.SeekStart()
	assert.Nil(t, err)
	assert.True(t, pos > 0)

	// read first line
	line, err := q.ReadNext()
	assert.Nil(t, err)
	assert.True(t, strings.Contains(line, "0.0.0.2"), line)
	assert.True(t, strings.HasPrefix(line, "{"), line)
	assert.True(t, strings.HasSuffix(line, "}"), line)

	// read second line
	line, err = q.ReadNext()
	assert.Nil(t, err)
	assert.Equal(t, int64(0), q.position)
	assert.True(t, strings.Contains(line, "0.0.0.1"), line)
	assert.True(t, strings.HasPrefix(line, "{"), line)
	assert.True(t, strings.HasSuffix(line, "}"), line)

	// try reading again (there's nothing to read anymore)
	line, err = q.ReadNext()
	assert.Equal(t, io.EOF, err)
	assert.Equal(t, "", line)
}

// prepareTestFile - prepares a test query log file with the specified number of lines
func prepareTestFile(dir string, linesCount int) string {
	format := `{"IP":"${IP}","T":"${TIMESTAMP}","QH":"example.org","QT":"A","QC":"IN","Answer":"AAAAAAABAAEAAAAAB2V4YW1wbGUDb3JnAAABAAEHZXhhbXBsZQNvcmcAAAEAAQAAAAAABAECAwQ=","Result":{},"Elapsed":0,"Upstream":"upstream"}`

	lineTime, _ := time.Parse(time.RFC3339Nano, "2020-02-18T22:36:35.920973+03:00")
	lineIP := uint32(0)

	f, _ := ioutil.TempFile(dir, "*.txt")

	for i := 0; i < linesCount; i++ {
		lineIP += 1
		lineTime = lineTime.Add(time.Second)

		ip := make(net.IP, 4)
		binary.BigEndian.PutUint32(ip, lineIP)

		line := format
		line = strings.ReplaceAll(line, "${IP}", ip.String())
		line = strings.ReplaceAll(line, "${TIMESTAMP}", lineTime.Format(time.RFC3339Nano))

		_, _ = f.WriteString(line)
		_, _ = f.WriteString("\n")
	}

	return f.Name()
}