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|
package lmdbsync
import (
"bufio"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"testing"
"time"
"golang.org/x/net/context"
"github.com/bmatsuo/lmdb-go/lmdb"
)
func TestResize(t *testing.T) {
tempdir, err := ioutil.TempDir("", "lmdbsync_testresize")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tempdir)
dbpath := filepath.Join(tempdir, "db")
err = os.Mkdir(dbpath, 0755)
if err != nil {
t.Error(err)
return
}
env, err := NewEnv(nil)
if err != nil {
t.Error(err)
return
}
defer env.Close()
err = env.Open(dbpath, 0, 0644)
if err != nil {
t.Error(err)
return
}
var root lmdb.DBI
env.Update(func(txn *lmdb.Txn) (err error) {
root, err = txn.OpenRoot(0)
if err != nil {
return err
}
return txn.Put(root, []byte("_start"), []byte(time.Now().String()), 0)
})
before, err := env.Info()
if err != nil {
t.Error(err)
return
}
bin := filepath.Join(tempdir, "testresize")
build := exec.Command("go", "build", "-o", bin, "./testresize")
build.Stderr = os.Stderr
err = build.Run()
if err != nil {
t.Error(err)
return
}
r1, w1, err := os.Pipe()
if err != nil {
t.Error(err)
return
}
r2, w2, err := os.Pipe()
if err != nil {
t.Error(err)
return
}
closePipes := func() {
w1.Close()
w2.Close()
r1.Close()
r2.Close()
}
cmd1 := exec.Command(bin)
cmd1.Dir = tempdir
cmd2 := exec.Command(bin)
cmd2.Dir = tempdir
cmd1.Stdin = r1
cmd2.Stdout = w1
cmd2.Stdin = r2
cmd1.Stdout = w2
stderr1, err := cmd1.StderrPipe()
if err != nil {
t.Error(err)
closePipes()
return
}
stderr2, err := cmd2.StderrPipe()
if err != nil {
t.Error(err)
closePipes()
return
}
stderr := io.MultiReader(stderr1, stderr2)
err = cmd1.Start()
if err != nil {
t.Errorf("start 1: %v", err)
closePipes()
return
}
err = cmd2.Start()
if err != nil {
t.Errorf("start 2: %v", err)
closePipes()
return
}
go fmt.Fprintln(w1, "start")
scanner := bufio.NewScanner(stderr)
for scanner.Scan() {
t.Log(scanner.Text())
}
closePipes()
err1 := cmd1.Wait()
if err1 != nil {
t.Errorf("err 1: %v", err1)
}
err2 := cmd2.Wait()
if err2 != nil {
t.Errorf("err 2: %v", err2)
}
trace := &resizeTracer{}
runner := env.WithHandler(HandlerChain{
trace,
MapResizedHandler(2, func(retry int) time.Duration {
if retry > 0 {
t.Errorf("failed to reopen at %d times", retry)
}
return time.Millisecond
}),
})
err = runner.Update(func(txn *lmdb.Txn) (err error) {
return txn.Put(root, []byte("_finish"), []byte(time.Now().String()), 0)
})
if err != nil {
t.Error(err)
}
if trace.resized == 0 {
t.Errorf("no resize detected")
}
after, err := env.Info()
if err != nil {
t.Error(err)
return
}
if after.MapSize <= before.MapSize {
t.Errorf("mapsize: %d (<= %d)", after.MapSize, before.MapSize)
}
}
type resizeTracer struct {
resized int
}
func (t *resizeTracer) HandleTxnErr(c context.Context, env *Env, err error) (context.Context, error) {
if lmdb.IsMapResized(err) {
t.resized++
}
return c, err
}
|
