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brianvoe committed Feb 18, 2024
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781 changes: 326 additions & 455 deletions BENCHMARKS.md

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84 changes: 52 additions & 32 deletions README.md
Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
![alt text](https://raw.githubusercontent.com/brianvoe/gofakeit/master/logo.png)

# Gofakeit [![Go Report Card](https://goreportcard.com/badge/github.com/brianvoe/gofakeit)](https://goreportcard.com/report/github.com/brianvoe/gofakeit) ![Test](https://github.com/brianvoe/gofakeit/workflows/Test/badge.svg?branch=master) [![GoDoc](https://godoc.org/github.com/brianvoe/gofakeit/v6?status.svg)](https://godoc.org/github.com/brianvoe/gofakeit/v6) [![license](http://img.shields.io/badge/license-MIT-green.svg?style=flat)](https://raw.githubusercontent.com/brianvoe/gofakeit/master/LICENSE.txt)
# Gofakeit [![Go Report Card](https://goreportcard.com/badge/github.com/brianvoe/gofakeit)](https://goreportcard.com/report/github.com/brianvoe/gofakeit) ![Test](https://github.com/brianvoe/gofakeit/workflows/Test/badge.svg?branch=master) [![GoDoc](https://godoc.org/github.com/brianvoe/gofakeit/v7?status.svg)](https://godoc.org/github.com/brianvoe/gofakeit/v7) [![license](http://img.shields.io/badge/license-MIT-green.svg?style=flat)](https://raw.githubusercontent.com/brianvoe/gofakeit/master/LICENSE.txt)

Random data generator written in go

Expand Down Expand Up @@ -33,13 +33,13 @@ Thank you to all our Gofakeit contributors!
## Installation

```go
go get github.com/brianvoe/gofakeit/v6
go get github.com/brianvoe/gofakeit/v7
```

## Simple Usage

```go
import "github.com/brianvoe/gofakeit/v6"
import "github.com/brianvoe/gofakeit/v7"

gofakeit.Name() // Markus Moen
gofakeit.Email() // alaynawuckert@kozey.biz
Expand All @@ -65,7 +65,7 @@ If you need a reproducible outcome you can set it via the Seed function call. Ev
this repo sets it for testing purposes.

```go
import "github.com/brianvoe/gofakeit/v6"
import "github.com/brianvoe/gofakeit/v7"

gofakeit.Seed(0) // If 0 will use crypto/rand to generate a number

Expand All @@ -76,25 +76,43 @@ gofakeit.Seed(8675309) // Set it to whatever number you want

## Random Sources

Gofakeit has a few rand sources, by default it uses math.Rand and uses mutex locking to allow for safe goroutines.
Gofakeit has a few rand sources, by default it uses math/rand/v2 PCG which is a pseudo random number generator and is thread locked.

If you want to use a more performant source please use NewUnlocked. Be aware that it is not goroutine safe.
If you want to see other potential sources you can see the sub package [Source](https://pkg.go.dev/github.com/brianvoe/gofakeit/v7/source) for more information.

```go
import "github.com/brianvoe/gofakeit/v6"
import (
"github.com/brianvoe/gofakeit/v7"
"github.com/brianvoe/gofakeit/v7/source"
"math/rand/v2"
)

// Uses math/rand(Pseudo) with mutex locking
// Uses math/rand/v2(PCG Pseudo) with mutex locking
faker := gofakeit.New(0)

// Uses math/rand(Pseudo) with NO mutext locking
// More performant but not goroutine safe.
faker := gofakeit.NewUnlocked(0)
// NewFaker takes in a source and whether or not it should be thread safe
faker := gofakeit.NewFaker(source rand.Source, threadSafe bool)

// Uses crypto/rand(cryptographically secure) with mutext locking
faker := gofakeit.NewCrypto()
// PCG Pseudo
faker := gofakeit.NewFaker(rand.NewPCG(11, 11), true)

// Pass in your own random source
faker := gofakeit.NewCustom()
// ChaCha8
faker := gofakeit.NewFaker(rand.NewChaCha8([32]byte{0, 1, 2, 3, 4, 5}), true)


// Additional from Gofakeit sub package source

// JSF(Jenkins Small Fast)
faker := gofakeit.NewFaker(source.NewJSF(11), true)

// SFC(Simple Fast Counter)
faker := gofakeit.NewFaker(source.NewSFC(11), true)

// Crypto - Uses crypto/rand
faker := gofakeit.NewFaker(source.NewCrypto(), true)

// Dumb - simple incrementing number
faker := gofakeit.NewFaker(source.NewDumb(11), true)
```

## Global Rand Set
Expand All @@ -103,10 +121,13 @@ If you would like to use the simple function calls but need to use something lik
crypto/rand you can override the default global with the random source that you want.

```go
import "github.com/brianvoe/gofakeit/v6"
import (
"github.com/brianvoe/gofakeit/v7"
"math/rand/v2"
)

faker := gofakeit.NewCrypto()
gofakeit.SetGlobalFaker(faker)
faker := gofakeit.New(0)
gofakeit.GlobalFaker = faker
```

## Struct
Expand All @@ -117,7 +138,7 @@ as well as some non-basic like time.Time.
Struct fields can also use tags to more specifically generate data for that field type.

```go
import "github.com/brianvoe/gofakeit/v6"
import "github.com/brianvoe/gofakeit/v7"

// Create structs with random injected data
type Foo struct {
Expand Down Expand Up @@ -147,14 +168,14 @@ type Bar struct {

// Pass your struct as a pointer
var f Foo
gofakeit.Struct(&f)
err := gofakeit.Struct(&f)

fmt.Println(f.Str) // hrukpttuezptneuvunh
fmt.Println(f.Int) // -7825289004089916589
fmt.Println(*f.Pointer) // -343806609094473732
fmt.Println(f.Name) // fred
fmt.Println(f.Sentence) // Record river mind.
fmt.Println(f.RandStr) // world
fmt.Println(fStr) // world
fmt.Println(f.Number) // 4
fmt.Println(f.Regex) // cbdfc
fmt.Println(f.Map) // map[PxLIo:52 lxwnqhqc:846]
Expand Down Expand Up @@ -229,8 +250,8 @@ gofakeit.AddFuncLookup("friendname", gofakeit.Info{
Description: "Random friend name",
Example: "bill",
Output: "string",
Generate: func(r *rand.Rand, m *gofakeit.MapParams, info *gofakeit.Info) (any, error) {
return gofakeit.RandomString([]string{"bill", "bob", "sally"}), nil
Generate: func(f *Faker, m *gofakeit.MapParams, info *gofakeit.Info) (any, error) {
return f.RandomString([]string{"bill", "bob", "sally"}), nil
},
})

Expand All @@ -243,14 +264,14 @@ gofakeit.AddFuncLookup("jumbleword", gofakeit.Info{
Params: []gofakeit.Param{
{Field: "word", Type: "string", Description: "Word you want to jumble"},
},
Generate: func(r *rand.Rand, m *gofakeit.MapParams, info *gofakeit.Info) (any, error) {
Generate: func(f *Faker, m *gofakeit.MapParams, info *gofakeit.Info) (any, error) {
word, err := info.GetString(m, "word")
if err != nil {
return nil, err
}

split := strings.Split(word, "")
gofakeit.ShuffleStrings(split)
f.ShuffleStrings(split)
return strings.Join(split, ""), nil
},
})
Expand Down Expand Up @@ -301,7 +322,7 @@ Additional Available Functions
### Example Usages

```go
import "github.com/brianvoe/gofakeit/v6"
import "github.com/brianvoe/gofakeit/v7"

func main() {
// Accessing the Lines variable from within the template.
Expand Down Expand Up @@ -748,10 +769,14 @@ ProgrammingLanguageBest() string

```go
Number(min int, max int) int
Int() int
IntN(n int) int
Int8() int8
Int16() int16
Int32() int32
Int64() int64
Uint() uint
UintN(n uint) uint
Uint8() uint8
Uint16() uint16
Uint32() uint32
Expand All @@ -762,12 +787,7 @@ Float64() float64
Float64Range(min, max float64) float64
ShuffleInts(a []int)
RandomInt(i []int) int
HexUint8() string
HexUint16() string
HexUint32() string
HexUint64() string
HexUint128() string
HexUint256() string
HexUint(bitsize int) string
```

### String
Expand Down
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