package level_test
import (
"bytes"
"errors"
"io"
"strings"
"testing"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
)
func TestVariousLevels(t *testing.T) {
testCases := []struct {
name string
allowed level.Option
want string
}{
{
"AllowAll",
level.AllowAll(),
strings.Join([]string{
`{"level":"debug","this is":"debug log"}`,
`{"level":"info","this is":"info log"}`,
`{"level":"warn","this is":"warn log"}`,
`{"level":"error","this is":"error log"}`,
}, "\n"),
},
{
"AllowDebug",
level.AllowDebug(),
strings.Join([]string{
`{"level":"debug","this is":"debug log"}`,
`{"level":"info","this is":"info log"}`,
`{"level":"warn","this is":"warn log"}`,
`{"level":"error","this is":"error log"}`,
}, "\n"),
},
{
"AllowDebug",
level.AllowInfo(),
strings.Join([]string{
`{"level":"info","this is":"info log"}`,
`{"level":"warn","this is":"warn log"}`,
`{"level":"error","this is":"error log"}`,
}, "\n"),
},
{
"AllowWarn",
level.AllowWarn(),
strings.Join([]string{
`{"level":"warn","this is":"warn log"}`,
`{"level":"error","this is":"error log"}`,
}, "\n"),
},
{
"AllowError",
level.AllowError(),
strings.Join([]string{
`{"level":"error","this is":"error log"}`,
}, "\n"),
},
{
"AllowNone",
level.AllowNone(),
``,
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
var buf bytes.Buffer
logger := level.NewFilter(log.NewJSONLogger(&buf), tc.allowed)
level.Debug(logger).Log("this is", "debug log")
level.Info(logger).Log("this is", "info log")
level.Warn(logger).Log("this is", "warn log")
level.Error(logger).Log("this is", "error log")
if want, have := tc.want, strings.TrimSpace(buf.String()); want != have {
t.Errorf("\nwant:\n%s\nhave:\n%s", want, have)
}
})
}
}
func TestErrNotAllowed(t *testing.T) {
myError := errors.New("squelched!")
opts := []level.Option{
level.AllowWarn(),
level.ErrNotAllowed(myError),
}
logger := level.NewFilter(log.NewNopLogger(), opts...)
if want, have := myError, level.Info(logger).Log("foo", "bar"); want != have {
t.Errorf("want %#+v, have %#+v", want, have)
}
if want, have := error(nil), level.Warn(logger).Log("foo", "bar"); want != have {
t.Errorf("want %#+v, have %#+v", want, have)
}
}
func TestErrNoLevel(t *testing.T) {
myError := errors.New("no level specified")
var buf bytes.Buffer
opts := []level.Option{
level.SquelchNoLevel(true),
level.ErrNoLevel(myError),
}
logger := level.NewFilter(log.NewJSONLogger(&buf), opts...)
if want, have := myError, logger.Log("foo", "bar"); want != have {
t.Errorf("want %v, have %v", want, have)
}
if want, have := ``, strings.TrimSpace(buf.String()); want != have {
t.Errorf("\nwant '%s'\nhave '%s'", want, have)
}
}
func TestAllowNoLevel(t *testing.T) {
var buf bytes.Buffer
opts := []level.Option{
level.SquelchNoLevel(false),
level.ErrNoLevel(errors.New("I should never be returned!")),
}
logger := level.NewFilter(log.NewJSONLogger(&buf), opts...)
if want, have := error(nil), logger.Log("foo", "bar"); want != have {
t.Errorf("want %v, have %v", want, have)
}
if want, have := `{"foo":"bar"}`, strings.TrimSpace(buf.String()); want != have {
t.Errorf("\nwant '%s'\nhave '%s'", want, have)
}
}
func TestLevelContext(t *testing.T) {
var buf bytes.Buffer
// Wrapping the level logger with a context allows users to use
// log.DefaultCaller as per normal.
var logger log.Logger
logger = log.NewLogfmtLogger(&buf)
logger = level.NewFilter(logger, level.AllowAll())
logger = log.With(logger, "caller", log.DefaultCaller)
level.Info(logger).Log("foo", "bar")
if want, have := `level=info caller=level_test.go:149 foo=bar`, strings.TrimSpace(buf.String()); want != have {
t.Errorf("\nwant '%s'\nhave '%s'", want, have)
}
}
func TestContextLevel(t *testing.T) {
var buf bytes.Buffer
// Wrapping a context with the level logger still works, but requires users
// to specify a higher callstack depth value.
var logger log.Logger
logger = log.NewLogfmtLogger(&buf)
logger = log.With(logger, "caller", log.Caller(5))
logger = level.NewFilter(logger, level.AllowAll())
level.Info(logger).Log("foo", "bar")
if want, have := `caller=level_test.go:165 level=info foo=bar`, strings.TrimSpace(buf.String()); want != have {
t.Errorf("\nwant '%s'\nhave '%s'", want, have)
}
}
func TestLevelFormatting(t *testing.T) {
testCases := []struct {
name string
format func(io.Writer) log.Logger
output string
}{
{
name: "logfmt",
format: log.NewLogfmtLogger,
output: `level=info foo=bar`,
},
{
name: "JSON",
format: log.NewJSONLogger,
output: `{"foo":"bar","level":"info"}`,
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
var buf bytes.Buffer
logger := tc.format(&buf)
level.Info(logger).Log("foo", "bar")
if want, have := tc.output, strings.TrimSpace(buf.String()); want != have {
t.Errorf("\nwant: '%s'\nhave '%s'", want, have)
}
})
}
}
func TestInjector(t *testing.T) {
var (
output []interface{}
logger log.Logger
)
logger = log.LoggerFunc(func(keyvals ...interface{}) error {
output = keyvals
return nil
})
logger = level.NewInjector(logger, level.InfoValue())
logger.Log("foo", "bar")
if got, want := len(output), 4; got != want {
t.Errorf("missing level not injected: got len==%d, want len==%d", got, want)
}
if got, want := output[0], level.Key(); got != want {
t.Errorf("wrong level key: got %#v, want %#v", got, want)
}
if got, want := output[1], level.InfoValue(); got != want {
t.Errorf("wrong level value: got %#v, want %#v", got, want)
}
level.Error(logger).Log("foo", "bar")
if got, want := len(output), 4; got != want {
t.Errorf("leveled record modified: got len==%d, want len==%d", got, want)
}
if got, want := output[0], level.Key(); got != want {
t.Errorf("wrong level key: got %#v, want %#v", got, want)
}
if got, want := output[1], level.ErrorValue(); got != want {
t.Errorf("wrong level value: got %#v, want %#v", got, want)
}
}