stack_test.go

Documentation: golang.org/x/xerrors

     1  // Copyright 2018 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package xerrors_test
     6  
     7  import (
     8  	"bytes"
     9  	"fmt"
    10  	"math/big"
    11  	"testing"
    12  
    13  	"golang.org/x/xerrors"
    14  	"golang.org/x/xerrors/internal"
    15  )
    16  
    17  type myType struct{}
    18  
    19  func (myType) Format(s fmt.State, v rune) {
    20  	s.Write(bytes.Repeat([]byte("Hi! "), 10))
    21  }
    22  
    23  func BenchmarkErrorf(b *testing.B) {
    24  	err := xerrors.New("foo")
    25  	// pi := big.NewFloat(3.14) // Something expensive.
    26  	num := big.NewInt(5)
    27  	args := func(a ...interface{}) []interface{} { return a }
    28  	benchCases := []struct {
    29  		name   string
    30  		format string
    31  		args   []interface{}
    32  	}{
    33  		{"no_format", "msg: %v", args(err)},
    34  		{"with_format", "failed %d times: %v", args(5, err)},
    35  		{"method: mytype", "pi: %v", args("myfile.go", myType{}, err)},
    36  		{"method: number", "pi: %v", args("myfile.go", num, err)},
    37  	}
    38  	for _, bc := range benchCases {
    39  		b.Run(bc.name, func(b *testing.B) {
    40  			b.Run("ExpWithTrace", func(b *testing.B) {
    41  				for i := 0; i < b.N; i++ {
    42  					xerrors.Errorf(bc.format, bc.args...)
    43  				}
    44  			})
    45  			b.Run("ExpNoTrace", func(b *testing.B) {
    46  				internal.EnableTrace = false
    47  				defer func() { internal.EnableTrace = true }()
    48  
    49  				for i := 0; i < b.N; i++ {
    50  					xerrors.Errorf(bc.format, bc.args...)
    51  				}
    52  			})
    53  			b.Run("Core", func(b *testing.B) {
    54  				for i := 0; i < b.N; i++ {
    55  					fmt.Errorf(bc.format, bc.args...)
    56  				}
    57  			})
    58  		})
    59  	}
    60  }
    61
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