github.com/johnathanhowell/sia@v0.5.1-beta.0.20160524050156-83dcc3d37c94/modules/renter/erasure_test.go (about)

     1  package renter
     2  
     3  import (
     4  	"bytes"
     5  	"crypto/rand"
     6  	"io/ioutil"
     7  	"testing"
     8  )
     9  
    10  // TestRSEncode tests the rsCode type.
    11  func TestRSEncode(t *testing.T) {
    12  	badParams := []struct {
    13  		data, parity int
    14  	}{
    15  		{-1, -1},
    16  		{-1, 0},
    17  		{0, -1},
    18  		{0, 0},
    19  		{0, 1},
    20  		{1, 0},
    21  	}
    22  	for _, ps := range badParams {
    23  		if _, err := NewRSCode(ps.data, ps.parity); err == nil {
    24  			t.Error("expected bad parameter error, got nil")
    25  		}
    26  	}
    27  
    28  	rsc, err := NewRSCode(10, 3)
    29  	if err != nil {
    30  		t.Fatal(err)
    31  	}
    32  
    33  	data := make([]byte, 777)
    34  	rand.Read(data)
    35  
    36  	pieces, err := rsc.Encode(data)
    37  	if err != nil {
    38  		t.Fatal(err)
    39  	}
    40  	_, err = rsc.Encode(nil)
    41  	if err == nil {
    42  		t.Fatal("expected nil data error, got nil")
    43  	}
    44  
    45  	buf := new(bytes.Buffer)
    46  	err = rsc.Recover(pieces, 777, buf)
    47  	if err != nil {
    48  		t.Fatal(err)
    49  	}
    50  	err = rsc.Recover(nil, 777, buf)
    51  	if err == nil {
    52  		t.Fatal("expected nil pieces error, got nil")
    53  	}
    54  
    55  	if !bytes.Equal(data, buf.Bytes()) {
    56  		t.Fatal("recovered data does not match original")
    57  	}
    58  }
    59  
    60  func BenchmarkRSEncode(b *testing.B) {
    61  	rsc, err := NewRSCode(80, 20)
    62  	if err != nil {
    63  		b.Fatal(err)
    64  	}
    65  	data := make([]byte, 1<<20)
    66  	rand.Read(data)
    67  
    68  	b.SetBytes(1 << 20)
    69  	b.ResetTimer()
    70  	for i := 0; i < b.N; i++ {
    71  		rsc.Encode(data)
    72  	}
    73  }
    74  
    75  func BenchmarkRSRecover(b *testing.B) {
    76  	rsc, err := NewRSCode(50, 200)
    77  	if err != nil {
    78  		b.Fatal(err)
    79  	}
    80  	data := make([]byte, 1<<20)
    81  	rand.Read(data)
    82  	pieces, err := rsc.Encode(data)
    83  	if err != nil {
    84  		b.Fatal(err)
    85  	}
    86  
    87  	b.SetBytes(1 << 20)
    88  	b.ResetTimer()
    89  	for i := 0; i < b.N; i++ {
    90  		pieces[0] = nil
    91  		rsc.Recover(pieces, 1<<20, ioutil.Discard)
    92  	}
    93  }