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package main
import (
"fmt"
"io"
"path"
"os"
"sort"
"time"
"xdelta"
)
const (
xdataset = "/volume/home/jmacd/src/testdata"
xcompare = "/volume/home/jmacd/src/xdelta3-3.0.10/xdelta3"
xdelta3 = "/volume/home/jmacd/src/xdelta-devel/xdelta3/xdelta3"
seed = 1422253499919909358
)
type Config struct {
srcbuf_size int64
window_size int64
blocksize int
}
func NewC() Config {
// TODO make these (and above) flags
return Config{1<<26, 1<<22, 1<<16}
}
func (c Config) smokeTest(t *xdelta.TestGroup, p xdelta.Program) {
target := "Hello world!"
source := "Hello world, nice to meet you!"
enc, err := t.Exec("encode", p, true, []string{"-e"})
if err != nil {
fmt.Println(err)
t.Panic(err)
}
dec, err := t.Exec("decode", p, true, []string{"-d"})
if err != nil {
fmt.Println(err)
t.Panic(err)
}
encodeout := t.Drain(enc.Stdout, "encode.stdout")
decodeout := t.Drain(dec.Stdout, "decode.stdout")
t.Empty(enc.Stderr, "encode")
t.Empty(dec.Stderr, "decode")
t.TestWrite("encode.stdin", enc.Stdin, []byte(target))
t.TestWrite("encode.srcin", enc.Srcin, []byte(source))
t.TestWrite("decode.stdin", dec.Stdin, <-encodeout)
t.TestWrite("decode.srcin", dec.Srcin, []byte(source))
if do := string(<-decodeout); do != target {
t.Panic(fmt.Errorf("It's not working! %s\n!=\n%s\n", do, target))
}
t.Wait(enc, dec)
}
type PairTest struct {
// Input
Config
program xdelta.Program
source, target string
// Output
encoded int64
encDuration time.Duration
decDuration time.Duration
}
// P is the test program, Q is the reference version.
func (cfg Config) datasetTest(t *xdelta.TestGroup, p, q xdelta.Program) {
dir, err := os.Open(xdataset)
if err != nil {
t.Panic(err)
}
dents, err := dir.Readdir(-1)
if err != nil {
t.Panic(err)
}
paths := make([]string, len(dents))
var total int64
for i, d := range dents {
if !d.Mode().IsRegular() {
continue
}
paths[i] = fmt.Sprint(xdataset, "/", d.Name())
total += d.Size()
}
meansize := total / int64(len(dents))
sort.Strings(paths)
for _, in1 := range paths {
for _, in2 := range paths {
if in1 == in2 { continue }
largest := uint(20)
for ; largest <= 31 && 1<<largest < meansize; largest++ {}
// 1/4, 1/2, and 1/1 of the power-of-2 rounded-up mean size
for b := largest - 2; b <= largest; b++ {
c1 := cfg
c1.srcbuf_size = 1<<b
ptest := &PairTest{c1, p, in1, in2, -1, 0, 0}
ptest.datasetPairTest(t, 1<<b);
qtest := &PairTest{c1, q, in1, in2, -1, 0, 0}
qtest.datasetPairTest(t, 1<<b)
fmt.Printf("%s, %s: %+d/%db, E:%s/%s D:%s/%s [B=%d]\n",
path.Base(in1), path.Base(in2),
ptest.encoded - qtest.encoded,
qtest.encoded,
(ptest.encDuration - qtest.encDuration).String(),
qtest.encDuration,
(ptest.decDuration - qtest.decDuration).String(),
qtest.decDuration,
1<<b)
}
}
}
}
func (pt *PairTest) datasetPairTest(t *xdelta.TestGroup, meanSize int64) {
cfg := pt.Config
eargs := []string{"-e", fmt.Sprint("-B", cfg.srcbuf_size), // "-q",
fmt.Sprint("-W", cfg.window_size), "-s", pt.source,
"-I0", "-S", "none", pt.target}
enc, err := t.Exec("encode", pt.program, false, eargs)
if err != nil {
t.Panic(err)
}
dargs := []string{"-dc", fmt.Sprint("-B", cfg.srcbuf_size), //"-q",
fmt.Sprint("-W", cfg.window_size), "-s", pt.source,
"-S", "none"}
dec, err := t.Exec("decode", pt.program, false, dargs)
if err != nil {
t.Panic(err)
}
tgt_check, err := os.Open(pt.target)
if err != nil {
t.Panic(err)
}
tgt_info, err := tgt_check.Stat()
if err != nil {
t.Panic(err)
}
t.Empty(enc.Stderr, "encode")
t.Empty(dec.Stderr, "decode")
t.CopyStreams(enc.Stdout, dec.Stdin, &pt.encoded)
t.CompareStreams(dec.Stdout, tgt_check, tgt_info.Size())
t.Wait(enc, dec)
pt.decDuration = dec.Cmd.ProcessState.UserTime()
pt.encDuration = enc.Cmd.ProcessState.UserTime()
}
func (cfg Config) offsetTest(t *xdelta.TestGroup, p xdelta.Program, offset, length int64) {
eargs := []string{"-e", "-0", fmt.Sprint("-B", cfg.srcbuf_size), "-q",
fmt.Sprint("-W", cfg.window_size)}
enc, err := t.Exec("encode", p, true, eargs)
if err != nil {
t.Panic(err)
}
dargs := []string{"-d", fmt.Sprint("-B", cfg.srcbuf_size), "-q",
fmt.Sprint("-W", cfg.window_size)}
dec, err := t.Exec("decode", p, true, dargs)
if err != nil {
t.Panic(err)
}
// The pipe used to read the decoder output and compare
// against the target.
read, write := io.Pipe()
t.Empty(enc.Stderr, "encode")
t.Empty(dec.Stderr, "decode")
var encoded_size int64
t.CopyStreams(enc.Stdout, dec.Stdin, &encoded_size)
t.CompareStreams(dec.Stdout, read, length)
// The decoder output ("read", above) is compared with the
// test-provided output ("write", below). The following
// generates the input and output twice.
t.WriteRstreams("encode", seed, offset, length, enc.Srcin, enc.Stdin)
t.WriteRstreams("decode", seed, offset, length, dec.Srcin, write)
t.Wait(enc, dec)
expect := cfg.srcbuf_size - offset
if float64(encoded_size) < (0.95 * float64(expect)) ||
float64(encoded_size) > (1.05 * float64(expect)) {
t.Fail("encoded size should be ~=", expect, ", actual ", encoded_size)
}
}
func main() {
r, err := xdelta.NewRunner()
if err != nil {
panic(err)
}
defer r.Cleanup()
cfg := NewC()
prog := xdelta.Program{xdelta3}
r.RunTest("smoketest", func(t *xdelta.TestGroup) { cfg.smokeTest(t, prog) })
// for i := uint(19); i <= 30; i += 1 {
// // The arguments to offsetTest are offset, source
// // window size, and file size. The source window size
// // is (2 << i) and (in the 3.0x release branch) is
// // limited to 2^31, so the the greatest value of i is
// // 30.
// cfg.srcbuf_size = 2 << i
// r.RunTest(fmt.Sprint("offset", i), func(t *xdelta.TestGroup) {
// cfg.offsetTest(t, prog, 1 << i, 3 << i) })
// }
comp := xdelta.Program{xcompare}
r.RunTest("dataset", func(t *xdelta.TestGroup) { cfg.datasetTest(t, prog, comp) })
}
|
