package tail import ( "io/ioutil" "os" "runtime" "testing" "github.com/influxdata/telegraf/plugins/parsers" "github.com/influxdata/telegraf/testutil" "github.com/stretchr/testify/assert" "github.com/stretchr/testify/require" ) func TestTailFromBeginning(t *testing.T) { tmpfile, err := ioutil.TempFile("", "") require.NoError(t, err) defer os.Remove(tmpfile.Name()) _, err = tmpfile.WriteString("cpu,mytag=foo usage_idle=100\n") require.NoError(t, err) tt := NewTail() tt.FromBeginning = true tt.Files = []string{tmpfile.Name()} p, _ := parsers.NewInfluxParser() tt.SetParser(p) defer tt.Stop() defer tmpfile.Close() acc := testutil.Accumulator{} require.NoError(t, tt.Start(&acc)) require.NoError(t, tt.Gather(&acc)) acc.Wait(1) acc.AssertContainsTaggedFields(t, "cpu", map[string]interface{}{ "usage_idle": float64(100), }, map[string]string{ "mytag": "foo", }) } func TestTailFromEnd(t *testing.T) { tmpfile, err := ioutil.TempFile("", "") require.NoError(t, err) defer os.Remove(tmpfile.Name()) _, err = tmpfile.WriteString("cpu,mytag=foo usage_idle=100\n") require.NoError(t, err) tt := NewTail() tt.Files = []string{tmpfile.Name()} p, _ := parsers.NewInfluxParser() tt.SetParser(p) defer tt.Stop() defer tmpfile.Close() acc := testutil.Accumulator{} require.NoError(t, tt.Start(&acc)) for _, tailer := range tt.tailers { for n, err := tailer.Tell(); err == nil && n == 0; n, err = tailer.Tell() { // wait for tailer to jump to end runtime.Gosched() } } _, err = tmpfile.WriteString("cpu,othertag=foo usage_idle=100\n") require.NoError(t, err) require.NoError(t, tt.Gather(&acc)) acc.Wait(1) acc.AssertContainsTaggedFields(t, "cpu", map[string]interface{}{ "usage_idle": float64(100), }, map[string]string{ "othertag": "foo", }) assert.Len(t, acc.Metrics, 1) } func TestTailBadLine(t *testing.T) { tmpfile, err := ioutil.TempFile("", "") require.NoError(t, err) defer os.Remove(tmpfile.Name()) tt := NewTail() tt.FromBeginning = true tt.Files = []string{tmpfile.Name()} p, _ := parsers.NewInfluxParser() tt.SetParser(p) defer tt.Stop() defer tmpfile.Close() acc := testutil.Accumulator{} require.NoError(t, tt.Start(&acc)) _, err = tmpfile.WriteString("cpu mytag= foo usage_idle= 100\n") require.NoError(t, err) require.NoError(t, tt.Gather(&acc)) acc.WaitError(1) assert.Contains(t, acc.Errors[0].Error(), "E! Malformed log line") }