Add streaming read and write benchmarks

Run using

    ./main_benchmark.bash

Also, rewrite command line args handling

frontend/fe_file.go

@@ -68,7 +68,7 @@ func (f *File) Open(ctx context.Context, req *fuse.OpenRequest, resp *fuse.OpenR
 
 func (f *File) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error {
 
-	fmt.Printf("Read: o=%d l=%d\n", req.Offset, req.Size)
+	cryptfs.Debug.Printf("Read: o=%d l=%d\n", req.Offset, req.Size)
 
 	// Read the backing ciphertext in one go
 	iblocks := f.crfs.SplitRange(uint64(req.Offset), uint64(req.Size))

frontend/fe_fs.go

@@ -27,17 +27,17 @@ type nullTracer struct {}
 
 func (nullTracer) Trace(op cluefs.FsOperTracer) {}
 
-func NewFS(key [16]byte, backing string, useOpenssl bool) *FS {
-	var nt nullTracer
-	clfs, err := cluefs.NewClueFS(backing, nt)
+func NewFS(key [16]byte, backing string, useOpenssl bool) (*FS, error) {
+	var tracer nullTracer
+	clfs, err := cluefs.NewClueFS(backing, tracer)
 	if err != nil {
-		panic(err)
+		return nil, err
 	}
 	return &FS {
 		CryptFS: cryptfs.NewCryptFS(key, useOpenssl),
 		ClueFS: clfs,
 		backing: backing,
-	}
+	}, nil
 }
 
 func (fs *FS) Root() (fusefs.Node, error) {

main.go

@@ -1,29 +1,46 @@
 package main
 
 import (
+	"path/filepath"
+	"flag"
+	"os"
+	"fmt"
+	"github.com/rfjakob/gocryptfs/frontend"
 	"bazil.org/fuse"
 	fusefs "bazil.org/fuse/fs"
-	"fmt"
-	"github.com/rfjakob/cluefs/lib/cluefs"
-	"github.com/rfjakob/gocryptfs/frontend"
-	"os"
+
 )
 
 const (
 	PROGRAM_NAME = "gocryptfs"
 	USE_OPENSSL = true
+
+	ERREXIT_USAGE = 1
+	ERREXIT_NEWFS = 2
+	ERREXIT_MOUNT = 3
+	ERREXIT_SERVE = 4
+	ERREXIT_MOUNT2 = 5
 )
 
 func main() {
 	// Parse command line arguments
-	conf, err := cluefs.ParseArguments()
-	if err != nil {
-		os.Exit(1)
+	flag.Parse()
+	if flag.NArg() < 2 {
+		fmt.Printf("NArg=%d\n", flag.NArg())
+		fmt.Printf("usage: %s CIPHERDIR MOUNTPOINT\n", PROGRAM_NAME)
+		os.Exit(ERREXIT_USAGE)
 	}
 
+	cipherdir, _ := filepath.Abs(flag.Arg(0))
+	mountpoint, err := filepath.Abs(flag.Arg(1))
+
 	// Create the file system object
 	var key [16]byte
-	cfs := frontend.NewFS(key, conf.GetShadowDir(), USE_OPENSSL)
+	cfs, err := frontend.NewFS(key, cipherdir, USE_OPENSSL)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(ERREXIT_NEWFS)
+	}
 
 	// Mount the file system
 	mountOpts := []fuse.MountOption{
@@ -33,24 +50,24 @@ func main() {
 		fuse.LocalVolume(),
 		fuse.MaxReadahead(1024*1024),
 	}
-	conn, err := fuse.Mount(conf.GetMountPoint(), mountOpts...)
+	conn, err := fuse.Mount(mountpoint, mountOpts...)
 	if err != nil {
 		fmt.Println(err)
-		os.Exit(1)
+		os.Exit(ERREXIT_MOUNT)
 	}
 	defer conn.Close()
 
 	// Start serving requests
 	if err = fusefs.Serve(conn, cfs); err != nil {
 		fmt.Println(err)
-		os.Exit(1)
+		os.Exit(ERREXIT_SERVE)
 	}
 
 	// Check for errors when mounting the file system
 	<-conn.Ready
 	if err = conn.MountError; err != nil {
 		fmt.Println(err)
-		os.Exit(1)
+		os.Exit(ERREXIT_MOUNT2)
 	}
 
 	// We are done

main_benchmark.bash

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+set -eux
+
+go build
+go test -bench=.

main_test.go

@@ -0,0 +1,149 @@
+package main
+
+import (
+	"io"
+	"fmt"
+	"time"
+	"testing"
+	"os"
+	"os/exec"
+	"io/ioutil"
+	"crypto/md5"
+	"encoding/hex"
+)
+
+const tmpDir = "test_tmp_dir/"
+const plainDir = tmpDir + "plain/"
+const cipherDir = tmpDir + "cipher/"
+
+func TestMain(m *testing.M) {
+
+	fu := exec.Command("fusermount", "-u", plainDir)
+	fu.Stdout = os.Stdout
+	fu.Stderr = os.Stderr
+	fu.Run()
+	os.RemoveAll(tmpDir)
+
+	err := os.MkdirAll(plainDir, 0777)
+	if err != nil {
+		panic("Could not create plainDir")
+	}
+
+	err = os.MkdirAll(cipherDir, 0777)
+	if err != nil {
+		panic("Could not create cipherDir")
+	}
+
+	c := exec.Command("./gocryptfs", cipherDir, plainDir)
+	c.Stdout = os.Stdout
+	c.Stderr = os.Stderr
+	go c.Run()
+
+	time.Sleep(3 * time.Second)
+
+	r := m.Run()
+
+
+	fu.Run()
+	os.Exit(r)
+}
+
+func testWriteN(t *testing.T, fn string, n int, hashWant string) {
+	file, err := os.Create(plainDir + fn)
+	if err != nil {
+		t.FailNow()
+	}
+
+	d := make([]byte, n)
+	written, err := file.Write(d)
+	if err != nil || written != len(d) {
+		fmt.Printf("err=\"%s\", written=%d\n", err, written)
+		t.Fail()
+	}
+	file.Close()
+
+	buf, err := ioutil.ReadFile(plainDir + fn)
+	if err != nil {
+		t.Fail()
+	}
+
+	rawHash := md5.Sum(buf)
+	hashActual := hex.EncodeToString(rawHash[:])
+	if hashActual != hashWant {
+		fmt.Printf("hashWant=%s hashActual=%s\n", hashWant, hashActual)
+		t.Fail()
+	}
+}
+
+func TestWrite10(t *testing.T) {
+	testWriteN(t, "10", 10, "a63c90cc3684ad8b0a2176a6a8fe9005")
+}
+
+func TestWrite100(t *testing.T) {
+	testWriteN(t, "100", 100, "6d0bb00954ceb7fbee436bb55a8397a9")
+}
+
+func TestWrite1M(t *testing.T) {
+	testWriteN(t, "1M", 1024*1024, "b6d81b360a5672d80c27430f39153e2c")
+}
+
+func TestWrite1Mx100(t *testing.T) {
+	testWriteN(t, "1Mx100", 1024*1024, "b6d81b360a5672d80c27430f39153e2c")
+	// Read and check 100 times to catch race conditions
+	var i int
+	for i = 0; i < 100; i++ {
+		buf, err := ioutil.ReadFile(plainDir + "1M")
+		if err != nil {
+			t.Fail()
+		}
+		rawHash := md5.Sum(buf)
+		hashActual := hex.EncodeToString(rawHash[:])
+		if hashActual != "b6d81b360a5672d80c27430f39153e2c" {
+			fmt.Printf("Read corruption in loop # %d\n", i)
+			t.FailNow()
+		} else {
+			//fmt.Print(".")
+		}
+	}
+}
+
+func BenchmarkStreamWrite(t *testing.B) {
+	buf := make([]byte, 1024*1024)
+	t.SetBytes(int64(len(buf)))
+
+	file, err := os.Create(plainDir + "BenchmarkWrite")
+	if err != nil {
+		t.FailNow()
+	}
+
+	t.ResetTimer()
+	var i int
+	for i = 0; i < t.N; i++ {
+		written, err := file.Write(buf)
+		if err != nil {
+			fmt.Printf("err=\"%s\", written=%d\n", err.Error(), written)
+			t.FailNow()
+		}
+	}
+}
+
+func BenchmarkStreamRead(t *testing.B) {
+	buf := make([]byte, 1024*1024)
+	t.SetBytes(int64(len(buf)))
+	file, err := os.Open(plainDir + "BenchmarkWrite")
+	if err != nil {
+		t.FailNow()
+	}
+	t.ResetTimer()
+	var i int
+	for i = 0; i < t.N; i++ {
+		_, err := file.Read(buf)
+		if err == io.EOF {
+			fmt.Printf("Test file too small\n")
+			t.SkipNow()
+		} else if err != nil {
+			fmt.Println(err)
+			t.FailNow()
+		}
+	}
+}