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encode_test.go
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encode_test.go
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package logfmt_test
import (
"bytes"
"errors"
"fmt"
"io/ioutil"
"reflect"
"testing"
"time"
"github.com/go-logfmt/logfmt"
)
func TestEncodeKeyval(t *testing.T) {
data := []struct {
key, value interface{}
want string
err error
}{
{key: "k", value: "v", want: "k=v"},
{key: "k", value: nil, want: "k=null"},
{key: `\`, value: "v", want: `\=v`},
{key: "k", value: "", want: "k="},
{key: "k", value: "null", want: `k="null"`},
{key: "k", value: "<nil>", want: `k=<nil>`},
{key: "k", value: true, want: "k=true"},
{key: "k", value: 1, want: "k=1"},
{key: "k", value: 1.025, want: "k=1.025"},
{key: "k", value: 1e-3, want: "k=0.001"},
{key: "k", value: 3.5 + 2i, want: "k=(3.5+2i)"},
{key: "k", value: "v v", want: `k="v v"`},
{key: "k", value: " ", want: `k=" "`},
{key: "k", value: `"`, want: `k="\""`},
{key: "k", value: `=`, want: `k="="`},
{key: "k", value: `\`, want: `k=\`},
{key: "k", value: `=\`, want: `k="=\\"`},
{key: "k", value: `\"`, want: `k="\\\""`},
{key: "k", value: [2]int{2, 19}, err: logfmt.ErrUnsupportedValueType},
{key: "k", value: []string{"e1", "e 2"}, err: logfmt.ErrUnsupportedValueType},
{key: "k", value: structData{"a a", 9}, err: logfmt.ErrUnsupportedValueType},
{key: "k", value: decimalMarshaler{5, 9}, want: "k=5.9"},
{key: "k", value: (*decimalMarshaler)(nil), want: "k=null"},
{key: "k", value: decimalStringer{5, 9}, want: "k=5.9"},
{key: "k", value: (*decimalStringer)(nil), want: "k=null"},
{key: "k", value: marshalerStringer{5, 9}, want: "k=5.9"},
{key: "k", value: (*marshalerStringer)(nil), want: "k=null"},
{key: "k", value: new(nilMarshaler), want: "k=notnilmarshaler"},
{key: "k", value: (*nilMarshaler)(nil), want: "k=nilmarshaler"},
{key: (*marshalerStringer)(nil), value: "v", err: logfmt.ErrNilKey},
{key: decimalMarshaler{5, 9}, value: "v", want: "5.9=v"},
{key: (*decimalMarshaler)(nil), value: "v", err: logfmt.ErrNilKey},
{key: decimalStringer{5, 9}, value: "v", want: "5.9=v"},
{key: (*decimalStringer)(nil), value: "v", err: logfmt.ErrNilKey},
{key: marshalerStringer{5, 9}, value: "v", want: "5.9=v"},
{key: "k", value: "\xbd", want: `k="\ufffd"`},
{key: "k", value: "\ufffd\x00", want: `k="\ufffd\u0000"`},
{key: "k", value: "\ufffd", want: `k="\ufffd"`},
{key: "k", value: []byte("\ufffd\x00"), want: `k="\ufffd\u0000"`},
{key: "k", value: []byte("\ufffd"), want: `k="\ufffd"`},
}
for _, d := range data {
w := &bytes.Buffer{}
enc := logfmt.NewEncoder(w)
err := enc.EncodeKeyval(d.key, d.value)
if err != d.err {
t.Errorf("%#v, %#v: got error: %v, want error: %v", d.key, d.value, err, d.err)
}
if got, want := w.String(), d.want; got != want {
t.Errorf("%#v, %#v: got '%s', want '%s'", d.key, d.value, got, want)
}
}
}
func TestMarshalKeyvals(t *testing.T) {
one := 1
ptr := &one
nilPtr := (*int)(nil)
data := []struct {
in []interface{}
want []byte
err error
}{
{in: nil, want: nil},
{in: kv(), want: nil},
{in: kv(nil, "v"), err: logfmt.ErrNilKey},
{in: kv(nilPtr, "v"), err: logfmt.ErrNilKey},
{in: kv("\ufffd"), err: logfmt.ErrInvalidKey},
{in: kv("\xbd"), err: logfmt.ErrInvalidKey},
{in: kv("k"), want: []byte("k=null")},
{in: kv("k", nil), want: []byte("k=null")},
{in: kv("k", ""), want: []byte("k=")},
{in: kv("k", "null"), want: []byte(`k="null"`)},
{in: kv("k", "v"), want: []byte("k=v")},
{in: kv("k", true), want: []byte("k=true")},
{in: kv("k", 1), want: []byte("k=1")},
{in: kv("k", ptr), want: []byte("k=1")},
{in: kv("k", nilPtr), want: []byte("k=null")},
{in: kv("k", 1.025), want: []byte("k=1.025")},
{in: kv("k", 1e-3), want: []byte("k=0.001")},
{in: kv("k", "v v"), want: []byte(`k="v v"`)},
{in: kv("k", `"`), want: []byte(`k="\""`)},
{in: kv("k", `=`), want: []byte(`k="="`)},
{in: kv("k", `\`), want: []byte(`k=\`)},
{in: kv("k", `=\`), want: []byte(`k="=\\"`)},
{in: kv("k", `\"`), want: []byte(`k="\\\""`)},
{in: kv("k1", "v1", "k2", "v2"), want: []byte("k1=v1 k2=v2")},
{in: kv("k1", "v1", "k2", [2]int{}), want: []byte("k1=v1 k2=\"unsupported value type\"")},
{in: kv([2]int{}, "v1", "k2", "v2"), want: []byte("k2=v2")},
{in: kv("k", time.Date(2009, time.November, 10, 23, 0, 0, 0, time.UTC)), want: []byte("k=2009-11-10T23:00:00Z")},
{in: kv("k", errorMarshaler{}), want: []byte("k=\"error marshaling value of type logfmt_test.errorMarshaler: marshal error\"")},
{in: kv("k", decimalMarshaler{5, 9}), want: []byte("k=5.9")},
{in: kv("k", (*decimalMarshaler)(nil)), want: []byte("k=null")},
{in: kv("k", decimalStringer{5, 9}), want: []byte("k=5.9")},
{in: kv("k", (*decimalStringer)(nil)), want: []byte("k=null")},
{in: kv("k", marshalerStringer{5, 9}), want: []byte("k=5.9")},
{in: kv("k", (*marshalerStringer)(nil)), want: []byte("k=null")},
{in: kv(one, "v"), want: []byte("1=v")},
{in: kv(ptr, "v"), want: []byte("1=v")},
{in: kv((*marshalerStringer)(nil), "v"), err: logfmt.ErrNilKey},
{in: kv(decimalMarshaler{5, 9}, "v"), want: []byte("5.9=v")},
{in: kv((*decimalMarshaler)(nil), "v"), err: logfmt.ErrNilKey},
{in: kv(decimalStringer{5, 9}, "v"), want: []byte("5.9=v")},
{in: kv((*decimalStringer)(nil), "v"), err: logfmt.ErrNilKey},
{in: kv(marshalerStringer{5, 9}, "v"), want: []byte("5.9=v")},
{in: kv("k", panicingStringer{0}), want: []byte("k=ok")},
{in: kv("k", panicingStringer{1}), want: []byte("k=PANIC:panic1")},
// Need extra mechanism to test panic-while-printing-panicVal
//{in: kv("k", panicingStringer{2}), want: []byte("?")},
}
for _, d := range data {
got, err := logfmt.MarshalKeyvals(d.in...)
if err != d.err {
t.Errorf("%#v: got error: %v, want error: %v", d.in, err, d.err)
}
if !reflect.DeepEqual(got, d.want) {
t.Errorf("%#v: got '%s', want '%s'", d.in, got, d.want)
}
}
}
func kv(keyvals ...interface{}) []interface{} {
return keyvals
}
type structData struct {
A string `logfmt:"fieldA"`
B int
}
type nilMarshaler int
func (m *nilMarshaler) MarshalText() ([]byte, error) {
if m == nil {
return []byte("nilmarshaler"), nil
}
return []byte("notnilmarshaler"), nil
}
type decimalMarshaler struct {
a, b int
}
func (t decimalMarshaler) MarshalText() ([]byte, error) {
buf := &bytes.Buffer{}
fmt.Fprintf(buf, "%d.%d", t.a, t.b)
return buf.Bytes(), nil
}
type decimalStringer struct {
a, b int
}
func (s decimalStringer) String() string {
return fmt.Sprintf("%d.%d", s.a, s.b)
}
type marshalerStringer struct {
a, b int
}
func (t marshalerStringer) MarshalText() ([]byte, error) {
buf := &bytes.Buffer{}
fmt.Fprintf(buf, "%d.%d", t.a, t.b)
return buf.Bytes(), nil
}
func (t marshalerStringer) String() string {
return fmt.Sprint(t.a + t.b)
}
var errMarshal = errors.New("marshal error")
type errorMarshaler struct{}
func (errorMarshaler) MarshalText() ([]byte, error) {
return nil, errMarshal
}
type panicingStringer struct {
a int
}
func (p panicingStringer) String() string {
switch p.a {
case 1:
panic("panic1")
case 2:
panic(panicingStringer{a: 2})
}
return "ok"
}
func BenchmarkEncodeKeyval(b *testing.B) {
b.ReportAllocs()
enc := logfmt.NewEncoder(ioutil.Discard)
for i := 0; i < b.N; i++ {
enc.EncodeKeyval("sk", "10")
enc.EncodeKeyval("some-key", "a rather long string with spaces")
}
}