package querylog import ( "encoding/binary" "errors" "fmt" "io" "io/ioutil" "math" "net" "strings" "testing" "time" "github.com/stretchr/testify/assert" "github.com/stretchr/testify/require" ) // prepareTestFile prepares one test query log file with the specified lines // count. func prepareTestFile(t *testing.T, dir string, linesNum int) (name string) { t.Helper() f, err := ioutil.TempFile(dir, "*.txt") require.NoError(t, err) // Use defer and not t.Cleanup to make sure that the file is closed // after this function is done. defer func() { derr := f.Close() require.NoError(t, derr) }() const ans = `"AAAAAAABAAEAAAAAB2V4YW1wbGUDb3JnAAABAAEHZXhhbXBsZQNvcmcAAAEAAQAAAAAABAECAwQ="` const format = `{"IP":%q,"T":%q,"QH":"example.org","QT":"A","QC":"IN",` + `"Answer":` + ans + `,"Result":{},"Elapsed":0,"Upstream":"upstream"}` + "\n" var lineIP uint32 lineTime := time.Date(2020, 2, 18, 19, 36, 35, 920973000, time.UTC) for i := 0; i < linesNum; i++ { lineIP++ lineTime = lineTime.Add(time.Second) ip := make(net.IP, 4) binary.BigEndian.PutUint32(ip, lineIP) line := fmt.Sprintf(format, ip, lineTime.Format(time.RFC3339Nano)) _, err = f.WriteString(line) require.NoError(t, err) } return f.Name() } // prepareTestFiles prepares several test query log files, each with the // specified lines count. func prepareTestFiles(t *testing.T, filesNum, linesNum int) []string { t.Helper() if filesNum == 0 { return []string{} } dir := t.TempDir() files := make([]string, filesNum) for i := range files { files[filesNum-i-1] = prepareTestFile(t, dir, linesNum) } return files } // newTestQLogFile creates new *QLogFile for tests and registers the required // cleanup functions. func newTestQLogFile(t *testing.T, linesNum int) (file *QLogFile) { t.Helper() testFile := prepareTestFiles(t, 1, linesNum)[0] // Create the new QLogFile instance. file, err := NewQLogFile(testFile) require.Nil(t, err) assert.NotNil(t, file) t.Cleanup(func() { assert.Nil(t, file.Close()) }) return file } func TestQLogFile_ReadNext(t *testing.T) { testCases := []struct { name string linesNum int }{{ name: "empty", linesNum: 0, }, { name: "large", linesNum: 50000, }} for _, tc := range testCases { t.Run(tc.name, func(t *testing.T) { q := newTestQLogFile(t, tc.linesNum) // Calculate the expected position. fileInfo, err := q.file.Stat() require.Nil(t, err) var expPos int64 if expPos = fileInfo.Size(); expPos > 0 { expPos-- } // Seek to the start. pos, err := q.SeekStart() require.Nil(t, err) require.EqualValues(t, expPos, pos) var read int var line string for err == nil { line, err = q.ReadNext() if err == nil { assert.NotEmpty(t, line) read++ } } require.Equal(t, io.EOF, err) assert.Equal(t, tc.linesNum, read) }) } } func TestQLogFile_SeekTS_good(t *testing.T) { linesCases := []struct { name string num int }{{ name: "large", num: 10000, }, { name: "small", num: 10, }} for _, l := range linesCases { testCases := []struct { name string linesNum int line int }{{ name: "not_too_old", line: 2, }, { name: "old", line: l.num - 2, }, { name: "first", line: 0, }, { name: "last", line: l.num, }} q := newTestQLogFile(t, l.num) for _, tc := range testCases { t.Run(l.name+"_"+tc.name, func(t *testing.T) { line, err := getQLogFileLine(q, tc.line) require.Nil(t, err) ts := readQLogTimestamp(line) assert.NotEqualValues(t, 0, ts) // Try seeking to that line now. pos, _, err := q.SeekTS(ts) require.Nil(t, err) assert.NotEqualValues(t, 0, pos) testLine, err := q.ReadNext() require.Nil(t, err) assert.Equal(t, line, testLine) }) } } } func TestQLogFile_SeekTS_bad(t *testing.T) { linesCases := []struct { name string num int }{{ name: "large", num: 10000, }, { name: "small", num: 10, }} for _, l := range linesCases { testCases := []struct { name string ts int64 leq bool }{{ name: "non-existent_long_ago", }, { name: "non-existent_far_ahead", }, { name: "almost", leq: true, }} q := newTestQLogFile(t, l.num) testCases[0].ts = 123 lateTS, _ := time.Parse(time.RFC3339, "2100-01-02T15:04:05Z07:00") testCases[1].ts = lateTS.UnixNano() line, err := getQLogFileLine(q, l.num/2) require.Nil(t, err) testCases[2].ts = readQLogTimestamp(line) - 1 for _, tc := range testCases { t.Run(tc.name, func(t *testing.T) { assert.NotEqualValues(t, 0, tc.ts) var depth int _, depth, err = q.SeekTS(tc.ts) assert.NotEmpty(t, l.num) require.NotNil(t, err) if tc.leq { assert.LessOrEqual(t, depth, int(math.Log2(float64(l.num))+3)) } }) } } } func getQLogFileLine(q *QLogFile, lineNumber int) (line string, err error) { if _, err = q.SeekStart(); err != nil { return line, err } for i := 1; i < lineNumber; i++ { if _, err = q.ReadNext(); err != nil { return line, err } } return q.ReadNext() } // Check adding and loading (with filtering) entries from disk and memory. func TestQLogFile(t *testing.T) { // Create the new QLogFile instance. q := newTestQLogFile(t, 2) // Seek to the start. pos, err := q.SeekStart() require.Nil(t, err) assert.Greater(t, pos, int64(0)) // Read first line. line, err := q.ReadNext() require.Nil(t, err) assert.Contains(t, line, "0.0.0.2") assert.True(t, strings.HasPrefix(line, "{"), line) assert.True(t, strings.HasSuffix(line, "}"), line) // Read second line. line, err = q.ReadNext() require.Nil(t, err) assert.EqualValues(t, 0, q.position) assert.Contains(t, line, "0.0.0.1") 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() require.Equal(t, io.EOF, err) assert.Empty(t, line) } func NewTestQLogFileData(t *testing.T, data string) (file *QLogFile) { f, err := ioutil.TempFile(t.TempDir(), "*.txt") require.Nil(t, err) t.Cleanup(func() { assert.Nil(t, f.Close()) }) _, err = f.WriteString(data) require.Nil(t, err) file, err = NewQLogFile(f.Name()) require.Nil(t, err) t.Cleanup(func() { assert.Nil(t, file.Close()) }) return file } func TestQLog_Seek(t *testing.T) { const nl = "\n" const strV = "%s" const recs = `{"T":"` + strV + `","QH":"wfqvjymurpwegyv","QT":"A","QC":"IN","CP":"","Answer":"","Result":{},"Elapsed":66286385,"Upstream":"tls://dns-unfiltered.adguard.com:853"}` + nl + `{"T":"` + strV + `"}` + nl + `{"T":"` + strV + `"}` + nl timestamp, _ := time.Parse(time.RFC3339Nano, "2020-08-31T18:44:25.376690873+03:00") testCases := []struct { name string delta int wantErr error wantDepth int }{{ name: "ok", delta: 0, wantErr: nil, wantDepth: 2, }, { name: "too_late", delta: 2, wantErr: ErrTSTooLate, wantDepth: 2, }, { name: "too_early", delta: -2, wantErr: ErrTSTooEarly, wantDepth: 1, }} for _, tc := range testCases { t.Run(tc.name, func(t *testing.T) { data := fmt.Sprintf(recs, timestamp.Add(-time.Second).Format(time.RFC3339Nano), timestamp.Format(time.RFC3339Nano), timestamp.Add(time.Second).Format(time.RFC3339Nano), ) q := NewTestQLogFileData(t, data) _, depth, err := q.SeekTS(timestamp.Add(time.Second * time.Duration(tc.delta)).UnixNano()) require.Truef(t, errors.Is(err, tc.wantErr), "%v", err) assert.Equal(t, tc.wantDepth, depth) }) } }