rand.go

Documentation: github.com/aws/aws-sdk-go-v2/internal/rand

     1  package rand
     2  
     3  import (
     4  	"crypto/rand"
     5  	"fmt"
     6  	"io"
     7  	"math/big"
     8  )
     9  
    10  func init() {
    11  	Reader = rand.Reader
    12  }
    13  
    14  // Reader provides a random reader that can reset during testing.
    15  var Reader io.Reader
    16  
    17  var floatMaxBigInt = big.NewInt(1 << 53)
    18  
    19  // Float64 returns a float64 read from an io.Reader source. The returned float will be between [0.0, 1.0).
    20  func Float64(reader io.Reader) (float64, error) {
    21  	bi, err := rand.Int(reader, floatMaxBigInt)
    22  	if err != nil {
    23  		return 0, fmt.Errorf("failed to read random value, %v", err)
    24  	}
    25  
    26  	return float64(bi.Int64()) / (1 << 53), nil
    27  }
    28  
    29  // CryptoRandFloat64 returns a random float64 obtained from the crypto rand
    30  // source.
    31  func CryptoRandFloat64() (float64, error) {
    32  	return Float64(Reader)
    33  }
    34

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