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package recordio_test
import (
"bytes"
"fmt"
"io"
"math/rand"
"reflect"
"strconv"
"strings"
"testing"
"testing/iotest"
"github.com/mesos/mesos-go/api/v1/lib/encoding/framing"
"github.com/mesos/mesos-go/api/v1/lib/recordio"
)
func Example() {
var (
r = recordio.NewReader(strings.NewReader("6\nhello 0\n6\nworld!"))
lines []string
)
for {
fr, err := r.ReadFrame()
if err == io.EOF {
break
}
if err != nil {
panic(err)
}
lines = append(lines, string(fr))
}
fmt.Println(lines)
// Output:
// [hello world!]
}
func TestReadFrame(t *testing.T) {
list := func(v ...string) []string { return v }
variants := []struct {
name string
decorate func(io.Reader) io.Reader
}{
{"identity", func(r io.Reader) io.Reader { return r }},
{"one-byte", iotest.OneByteReader},
{"half", iotest.HalfReader},
}
for ti, tc := range []struct {
in string
frames []string
err error
}{
/* 0 */ {"", nil, nil},
/* 1 */ {"a", nil, framing.ErrorUnderrun},
/* 2 */ {"aaaaaaaaaaaaaaaaaaaaa", nil, framing.ErrorBadSize}, // 21 digits is too large for frame size
/* 3 */ {"111111111111111111111", nil, framing.ErrorBadSize},
/* 4 */ {"a\n", nil, framing.ErrorBadSize},
/* 5 */ {"0\n", nil, nil},
/* 6 */ {"00000000000000000000\n", nil, nil},
/* 7 */ {"000000000000000000000\n", nil, framing.ErrorBadSize},
/* 8 */ {"0\n0\n0\n", nil, nil},
/* 9 */ {"1\n", nil, framing.ErrorUnderrun},
/* 10 */ {"1\na", list("a"), nil},
/* 11 */ {"1\na0\n1\nb", list("a", "b"), nil},
/* 12 */ {"2\na", nil, framing.ErrorUnderrun},
/* 13 */ {"1\na1\nb1\nc", list("a", "b", "c"), nil},
/* 14 */ {"5\nabcde", list("abcde"), nil},
/* 15 */ {"5\nabcde3\nfgh", list("abcde", "fgh"), nil},
/* 16 */ {"5\nabcde5\nfgh", list("abcde"), framing.ErrorUnderrun},
/* 17 */ {"23\n", nil, framing.ErrorOversizedFrame}, // 23 exceeds max of 22
} {
for _, v := range variants {
t.Run(fmt.Sprintf("test case %d %s", ti, v.name), func(t *testing.T) {
var (
r = recordio.NewReader(v.decorate(
strings.NewReader(tc.in)), recordio.MaxMessageSize(22))
frames []string
lastErr error
)
for lastErr == nil {
fr, err := r.ReadFrame()
if err == nil {
t.Log("read frame " + string(fr))
frames = append(frames, string(fr))
}
lastErr = err
}
if tc.err == nil && lastErr != io.EOF {
t.Fatalf("unexpected error %q", lastErr)
}
if tc.err != nil && lastErr != tc.err {
t.Fatalf("expected error %q instead of error %q", tc.err, lastErr)
}
if !reflect.DeepEqual(tc.frames, frames) {
t.Fatalf("expected frames %#v instead of frames %#v", tc.frames, frames)
}
})
}
}
}
func BenchmarkReader(b *testing.B) {
var buf bytes.Buffer
genRecords(b, &buf)
r := recordio.NewReader(&buf)
b.StopTimer()
b.ResetTimer()
b.StartTimer()
for i := 0; i < b.N; i++ {
if tok, err := r.ReadFrame(); err != nil && err != io.EOF {
b.Fatal(err)
} else {
b.SetBytes(int64(len(tok)))
}
}
}
func genRecords(tb testing.TB, w io.Writer) {
rnd := rng{rand.New(rand.NewSource(0xdeadbeef))}
buf := make([]byte, 2<<12)
for i := 0; i < cap(buf); i++ {
sz := rnd.Intn(cap(buf))
n, err := rnd.Read(buf[:sz])
if err != nil {
tb.Fatal(err)
}
header := strconv.FormatInt(int64(n), 10) + "\n"
if _, err = io.WriteString(w, header); err != nil {
tb.Fatal(err)
} else if _, err = w.Write(buf[:n]); err != nil {
tb.Fatal(err)
}
}
}
type rng struct{ *rand.Rand }
func (r rng) Read(p []byte) (n int, err error) {
for i := 0; i < len(p); i += 7 {
val := r.Int63()
for j := 0; i+j < len(p) && j < 7; j++ {
p[i+j] = byte(val)
val >>= 8
}
}
return len(p), nil
}
|
