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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package slog
import (
"strconv"
"strings"
"testing"
"time"
"golang.org/x/exp/slices"
)
func TestRecordAttrs(t *testing.T) {
as := []Attr{Int("k1", 1), String("k2", "foo"), Int("k3", 3),
Int64("k4", -1), Float64("f", 3.1), Uint64("u", 999)}
r := newRecordWithAttrs(as)
if g, w := r.NumAttrs(), len(as); g != w {
t.Errorf("NumAttrs: got %d, want %d", g, w)
}
if got := attrsSlice(r); !attrsEqual(got, as) {
t.Errorf("got %v, want %v", got, as)
}
// Early return.
var got []Attr
r.Attrs(func(a Attr) bool {
got = append(got, a)
return len(got) < 2
})
want := as[:2]
if !attrsEqual(got, want) {
t.Errorf("got %v, want %v", got, want)
}
}
func TestRecordSource(t *testing.T) {
// Zero call depth => empty *Source.
for _, test := range []struct {
depth int
wantFunction string
wantFile string
wantLinePositive bool
}{
{0, "", "", false},
{-16, "", "", false},
{1, "golang.org/x/exp/slog.TestRecordSource", "record_test.go", true}, // 1: caller of NewRecord
{2, "testing.tRunner", "testing.go", true},
} {
var pc uintptr
if test.depth > 0 {
pc = callerPC(test.depth + 1)
}
r := NewRecord(time.Time{}, 0, "", pc)
got := r.source()
if i := strings.LastIndexByte(got.File, '/'); i >= 0 {
got.File = got.File[i+1:]
}
if got.Function != test.wantFunction || got.File != test.wantFile || (got.Line > 0) != test.wantLinePositive {
t.Errorf("depth %d: got (%q, %q, %d), want (%q, %q, %t)",
test.depth,
got.Function, got.File, got.Line,
test.wantFunction, test.wantFile, test.wantLinePositive)
}
}
}
func TestAliasingAndClone(t *testing.T) {
intAttrs := func(from, to int) []Attr {
var as []Attr
for i := from; i < to; i++ {
as = append(as, Int("k", i))
}
return as
}
check := func(r Record, want []Attr) {
t.Helper()
got := attrsSlice(r)
if !attrsEqual(got, want) {
t.Errorf("got %v, want %v", got, want)
}
}
// Create a record whose Attrs overflow the inline array,
// creating a slice in r.back.
r1 := NewRecord(time.Time{}, 0, "", 0)
r1.AddAttrs(intAttrs(0, nAttrsInline+1)...)
// Ensure that r1.back's capacity exceeds its length.
b := make([]Attr, len(r1.back), len(r1.back)+1)
copy(b, r1.back)
r1.back = b
// Make a copy that shares state.
r2 := r1
// Adding to both should panic.
r1.AddAttrs(Int("p", 0))
if !panics(func() { r2.AddAttrs(Int("p", 1)) }) {
t.Error("expected panic")
}
r1Attrs := attrsSlice(r1)
// Adding to a clone is fine.
r2 = r1.Clone()
check(r2, r1Attrs)
r2.AddAttrs(Int("p", 2))
check(r1, r1Attrs) // r1 is unchanged
check(r2, append(slices.Clip(r1Attrs), Int("p", 2)))
}
func newRecordWithAttrs(as []Attr) Record {
r := NewRecord(time.Now(), LevelInfo, "", 0)
r.AddAttrs(as...)
return r
}
func attrsSlice(r Record) []Attr {
s := make([]Attr, 0, r.NumAttrs())
r.Attrs(func(a Attr) bool { s = append(s, a); return true })
return s
}
func attrsEqual(as1, as2 []Attr) bool {
return slices.EqualFunc(as1, as2, Attr.Equal)
}
// Currently, pc(2) takes over 400ns, which is too expensive
// to call it for every log message.
func BenchmarkPC(b *testing.B) {
for depth := 0; depth < 5; depth++ {
b.Run(strconv.Itoa(depth), func(b *testing.B) {
b.ReportAllocs()
var x uintptr
for i := 0; i < b.N; i++ {
x = callerPC(depth)
}
_ = x
})
}
}
func BenchmarkRecord(b *testing.B) {
const nAttrs = nAttrsInline * 10
var a Attr
for i := 0; i < b.N; i++ {
r := NewRecord(time.Time{}, LevelInfo, "", 0)
for j := 0; j < nAttrs; j++ {
r.AddAttrs(Int("k", j))
}
r.Attrs(func(b Attr) bool { a = b; return true })
}
_ = a
}
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