mirror of
https://github.com/tailscale/tailscale.git
synced 2025-10-31 08:11:32 +01:00
c25968e1c5
Also perform minor cleanups on the ctxkey package itself. Provide guidance on when to use ctxkey.Key[T] over ctxkey.New. Also, allow for interface kinds because the value wrapping trick also happens to fix edge cases with interfaces in Go. Updates #cleanup Signed-off-by: Joe Tsai <joetsai@digital-static.net>
105 lines
3.5 KiB
Go
105 lines
3.5 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
|
|
// SPDX-License-Identifier: BSD-3-Clause
|
|
|
|
package ctxkey
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"io"
|
|
"regexp"
|
|
"testing"
|
|
"time"
|
|
|
|
qt "github.com/frankban/quicktest"
|
|
)
|
|
|
|
func TestKey(t *testing.T) {
|
|
c := qt.New(t)
|
|
ctx := context.Background()
|
|
|
|
// Test keys with the same name as being distinct.
|
|
k1 := New("same.Name", "")
|
|
c.Assert(k1.String(), qt.Equals, "same.Name")
|
|
k2 := New("same.Name", "")
|
|
c.Assert(k2.String(), qt.Equals, "same.Name")
|
|
c.Assert(k1 == k2, qt.Equals, false)
|
|
ctx = k1.WithValue(ctx, "hello")
|
|
c.Assert(k1.Has(ctx), qt.Equals, true)
|
|
c.Assert(k1.Value(ctx), qt.Equals, "hello")
|
|
c.Assert(k2.Has(ctx), qt.Equals, false)
|
|
c.Assert(k2.Value(ctx), qt.Equals, "")
|
|
ctx = k2.WithValue(ctx, "goodbye")
|
|
c.Assert(k1.Has(ctx), qt.Equals, true)
|
|
c.Assert(k1.Value(ctx), qt.Equals, "hello")
|
|
c.Assert(k2.Has(ctx), qt.Equals, true)
|
|
c.Assert(k2.Value(ctx), qt.Equals, "goodbye")
|
|
|
|
// Test default value.
|
|
k3 := New("mapreduce.Timeout", time.Hour)
|
|
c.Assert(k3.Has(ctx), qt.Equals, false)
|
|
c.Assert(k3.Value(ctx), qt.Equals, time.Hour)
|
|
ctx = k3.WithValue(ctx, time.Minute)
|
|
c.Assert(k3.Has(ctx), qt.Equals, true)
|
|
c.Assert(k3.Value(ctx), qt.Equals, time.Minute)
|
|
|
|
// Test incomparable value.
|
|
k4 := New("slice", []int(nil))
|
|
c.Assert(k4.Has(ctx), qt.Equals, false)
|
|
c.Assert(k4.Value(ctx), qt.DeepEquals, []int(nil))
|
|
ctx = k4.WithValue(ctx, []int{1, 2, 3})
|
|
c.Assert(k4.Has(ctx), qt.Equals, true)
|
|
c.Assert(k4.Value(ctx), qt.DeepEquals, []int{1, 2, 3})
|
|
|
|
// Accessors should be allocation free.
|
|
c.Assert(testing.AllocsPerRun(100, func() {
|
|
k1.Value(ctx)
|
|
k1.Has(ctx)
|
|
k1.ValueOk(ctx)
|
|
}), qt.Equals, 0.0)
|
|
|
|
// Test keys that are created without New.
|
|
var k5 Key[string]
|
|
c.Assert(k5.String(), qt.Equals, "string")
|
|
c.Assert(k1 == k5, qt.Equals, false) // should be different from key created by New
|
|
c.Assert(k5.Has(ctx), qt.Equals, false)
|
|
ctx = k5.WithValue(ctx, "fizz")
|
|
c.Assert(k5.Value(ctx), qt.Equals, "fizz")
|
|
var k6 Key[string]
|
|
c.Assert(k6.String(), qt.Equals, "string")
|
|
c.Assert(k5 == k6, qt.Equals, true)
|
|
c.Assert(k6.Has(ctx), qt.Equals, true)
|
|
ctx = k6.WithValue(ctx, "fizz")
|
|
|
|
// Test interface value types.
|
|
var k7 Key[any]
|
|
c.Assert(k7.Has(ctx), qt.Equals, false)
|
|
ctx = k7.WithValue(ctx, "whatever")
|
|
c.Assert(k7.Value(ctx), qt.DeepEquals, "whatever")
|
|
ctx = k7.WithValue(ctx, []int{1, 2, 3})
|
|
c.Assert(k7.Value(ctx), qt.DeepEquals, []int{1, 2, 3})
|
|
ctx = k7.WithValue(ctx, nil)
|
|
c.Assert(k7.Has(ctx), qt.Equals, true)
|
|
c.Assert(k7.Value(ctx), qt.DeepEquals, nil)
|
|
k8 := New[error]("error", io.EOF)
|
|
c.Assert(k8.Has(ctx), qt.Equals, false)
|
|
c.Assert(k8.Value(ctx), qt.Equals, io.EOF)
|
|
ctx = k8.WithValue(ctx, nil)
|
|
c.Assert(k8.Value(ctx), qt.Equals, nil)
|
|
c.Assert(k8.Has(ctx), qt.Equals, true)
|
|
err := fmt.Errorf("read error: %w", io.ErrUnexpectedEOF)
|
|
ctx = k8.WithValue(ctx, err)
|
|
c.Assert(k8.Value(ctx), qt.Equals, err)
|
|
c.Assert(k8.Has(ctx), qt.Equals, true)
|
|
}
|
|
|
|
func TestStringer(t *testing.T) {
|
|
t.SkipNow() // TODO(https://go.dev/cl/555697): Enable this after fix is merged upstream.
|
|
c := qt.New(t)
|
|
ctx := context.Background()
|
|
c.Assert(fmt.Sprint(New("foo.Bar", "").WithValue(ctx, "baz")), qt.Matches, regexp.MustCompile("foo.Bar.*baz"))
|
|
c.Assert(fmt.Sprint(New("", []int{}).WithValue(ctx, []int{1, 2, 3})), qt.Matches, regexp.MustCompile(fmt.Sprintf("%[1]T.*%[1]v", []int{1, 2, 3})))
|
|
c.Assert(fmt.Sprint(New("", 0).WithValue(ctx, 5)), qt.Matches, regexp.MustCompile("int.*5"))
|
|
c.Assert(fmt.Sprint(Key[time.Duration]{}.WithValue(ctx, time.Hour)), qt.Matches, regexp.MustCompile(fmt.Sprintf("%[1]T.*%[1]v", time.Hour)))
|
|
}
|