github.com/peterbourgon/diskv@v2.0.1+incompatible/issues_test.go (about)

     1  package diskv
     2  
     3  import (
     4  	"bytes"
     5  	"io/ioutil"
     6  	"sync"
     7  	"testing"
     8  	"time"
     9  )
    10  
    11  // ReadStream from cache shouldn't panic on a nil dereference from a nonexistent
    12  // Compression :)
    13  func TestIssue2A(t *testing.T) {
    14  	d := New(Options{
    15  		BasePath:     "test-issue-2a",
    16  		Transform:    func(string) []string { return []string{} },
    17  		CacheSizeMax: 1024,
    18  	})
    19  	defer d.EraseAll()
    20  
    21  	input := "abcdefghijklmnopqrstuvwxy"
    22  	key, writeBuf, sync := "a", bytes.NewBufferString(input), false
    23  	if err := d.WriteStream(key, writeBuf, sync); err != nil {
    24  		t.Fatal(err)
    25  	}
    26  
    27  	for i := 0; i < 2; i++ {
    28  		began := time.Now()
    29  		rc, err := d.ReadStream(key, false)
    30  		if err != nil {
    31  			t.Fatal(err)
    32  		}
    33  		buf, err := ioutil.ReadAll(rc)
    34  		if err != nil {
    35  			t.Fatal(err)
    36  		}
    37  		if !cmpBytes(buf, []byte(input)) {
    38  			t.Fatalf("read #%d: '%s' != '%s'", i+1, string(buf), input)
    39  		}
    40  		rc.Close()
    41  		t.Logf("read #%d in %s", i+1, time.Since(began))
    42  	}
    43  }
    44  
    45  // ReadStream on a key that resolves to a directory should return an error.
    46  func TestIssue2B(t *testing.T) {
    47  	blockTransform := func(s string) []string {
    48  		transformBlockSize := 3
    49  		sliceSize := len(s) / transformBlockSize
    50  		pathSlice := make([]string, sliceSize)
    51  		for i := 0; i < sliceSize; i++ {
    52  			from, to := i*transformBlockSize, (i*transformBlockSize)+transformBlockSize
    53  			pathSlice[i] = s[from:to]
    54  		}
    55  		return pathSlice
    56  	}
    57  
    58  	d := New(Options{
    59  		BasePath:     "test-issue-2b",
    60  		Transform:    blockTransform,
    61  		CacheSizeMax: 0,
    62  	})
    63  	defer d.EraseAll()
    64  
    65  	v := []byte{'1', '2', '3'}
    66  	if err := d.Write("abcabc", v); err != nil {
    67  		t.Fatal(err)
    68  	}
    69  
    70  	_, err := d.ReadStream("abc", false)
    71  	if err == nil {
    72  		t.Fatal("ReadStream('abc') should return error")
    73  	}
    74  	t.Logf("ReadStream('abc') returned error: %v", err)
    75  }
    76  
    77  // Ensure ReadStream with direct=true isn't racy.
    78  func TestIssue17(t *testing.T) {
    79  	var (
    80  		basePath = "test-data"
    81  	)
    82  
    83  	dWrite := New(Options{
    84  		BasePath:     basePath,
    85  		CacheSizeMax: 0,
    86  	})
    87  	defer dWrite.EraseAll()
    88  
    89  	dRead := New(Options{
    90  		BasePath:     basePath,
    91  		CacheSizeMax: 50,
    92  	})
    93  
    94  	cases := map[string]string{
    95  		"a": `1234567890`,
    96  		"b": `2345678901`,
    97  		"c": `3456789012`,
    98  		"d": `4567890123`,
    99  		"e": `5678901234`,
   100  	}
   101  
   102  	for k, v := range cases {
   103  		if err := dWrite.Write(k, []byte(v)); err != nil {
   104  			t.Fatalf("during write: %s", err)
   105  		}
   106  		dRead.Read(k) // ensure it's added to cache
   107  	}
   108  
   109  	var wg sync.WaitGroup
   110  	start := make(chan struct{})
   111  	for k, v := range cases {
   112  		wg.Add(1)
   113  		go func(k, v string) {
   114  			<-start
   115  			dRead.ReadStream(k, true)
   116  			wg.Done()
   117  		}(k, v)
   118  	}
   119  	close(start)
   120  	wg.Wait()
   121  }