Undeterministic upload tests

changelog/unreleased/non-deterministic-ocis-storage-test.md

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+Enhancement: Capture non-deterministic behavior on storages 
+
+As a developer creating/maintaining a storage driver I want to be able to validate the atomicity of all my storage driver operations.
+* Test for: Start 2 uploads, pause the first one, let the second one finish first, resume the first one at some point in time. Both uploads should finish. Needs to result in 2 versions, last finished is the most recent version.
+* Test for: Start 2 MKCOL requests with the same path, one needs to fail.
+
+https://github.com/cs3org/reva/pull/1430

pkg/storage/fs/ocis/ocis_test.go

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+// Copyright 2018-2021 CERN
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// In applying this license, CERN does not waive the privileges and immunities
+// granted to it by virtue of its status as an Intergovernmental Organization
+// or submit itself to any jurisdiction.
+
+// +build storageRace
+
+package ocis
+
+import (
+	"context"
+	"fmt"
+	userpb "github.com/cs3org/go-cs3apis/cs3/identity/user/v1beta1"
+	provider "github.com/cs3org/go-cs3apis/cs3/storage/provider/v1beta1"
+	"github.com/cs3org/reva/pkg/user"
+	"github.com/stretchr/testify/assert"
+	"io/ioutil"
+	"os"
+	"path"
+	"sync"
+	"testing"
+)
+
+// TestLackAdvisoryLocks demonstrates that access to a file
+// is not mutually exclusive on the oCIS storage.
+var (
+	config = make(map[string]interface{})
+	ctx context.Context
+	f, f1 *os.File
+	tmpDir string
+)
+
+func TestMain(m *testing.M) {
+	var err error
+
+	// prepare storage
+	{
+		tmpDir, _ = ioutil.TempDir("", "ocis_fs_unittests")
+		{
+			config["root"] = tmpDir
+			config["enable_home"] = false
+			config["user_layout"] = "{{.Id.OpaqueId}}"
+			config["owner"] = "f7fbf8c8-139b-4376-b307-cf0a8c2d0d9c"
+		}
+	}
+
+	// prepare context
+	{
+		u := &userpb.User{
+			Id: &userpb.UserId{
+				OpaqueId: "f7fbf8c8-139b-4376-b307-cf0a8c2d0d9c",
+			},
+			Username:    "test",
+			Mail:        "marie@example.org",
+			DisplayName: "Marie Curie",
+			Groups: []string{
+				"radium-lovers",
+				"polonium-lovers",
+				"physics-lovers",
+			},
+		}
+		ctx = user.ContextSetUser(context.Background(), u)
+	}
+
+	// do not do this. Prepare f0
+	if err = ioutil.WriteFile(fmt.Sprintf("%s/%s", tmpDir,"f.lol"), []byte("test"), 0644); err != nil {
+		panic(err)
+	}
+	f, err = os.Open(fmt.Sprintf("%s/%s", tmpDir,"f.lol"))
+	if err != nil {
+		panic(err)
+	}
+
+	// do not do this. Prepare f1
+	if err = ioutil.WriteFile(fmt.Sprintf("%s/%s", tmpDir,"f1.lol"), []byte("another run"), 0644); err != nil {
+		panic(err)
+	}
+	f1, err = os.Open(fmt.Sprintf("%s/%s", tmpDir,"f1.lol"))
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Printf("%s\n", tmpDir)
+	m.Run()
+
+	cts, err := ioutil.ReadFile(path.Join(tmpDir, "nodes", "root", "uploaded.txt"))
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println(string(cts))
+}
+
+// Scenario: start 2 uploads, pause the first one, let the second one finish first,
+// resume the first one at some point in time. Both uploads should finish.
+// Needs to result in 2 versions, last finished is the most recent version.
+func TestTwoUploadsVersioning(t *testing.T) {
+	//runtime.GOMAXPROCS(1) // uncomment to remove concurrency and see revisions working.
+	ofs, err := New(config)
+	if err != nil {
+		t.Error(err)
+	}
+
+	wg := &sync.WaitGroup{}
+	wg.Add(2)
+
+	// upload file with contents: "test"
+	go func(wg *sync.WaitGroup) {
+		ofs.Upload(ctx, &provider.Reference{
+			Spec: &provider.Reference_Path{Path: "uploaded.txt"},
+		}, f)
+		wg.Done()
+	}(wg)
+
+	// upload file with contents: "another run"
+	go func(wg *sync.WaitGroup) {
+		ofs.Upload(ctx, &provider.Reference{
+			Spec: &provider.Reference_Path{Path: "uploaded.txt"},
+		}, f1)
+		wg.Done()
+	}(wg)
+
+	// this test, by the way the oCIS storage is implemented, is non-deterministic, and the contents
+	// of uploaded.txt will change on each run depending on which of the 2 routines above makes it
+	// first into the scheduler. In order to make it deterministic, we have to consider the Upload impl-
+	// ementation and we can leverage concurrency and add locks only when the destination path are the
+	// same for 2 uploads.
+
+	wg.Wait()
+	revisions, err := ofs.ListRevisions(ctx, &provider.Reference{
+		Spec: &provider.Reference_Path{Path: "uploaded.txt"},
+	})
+	assert.NoError(t, err)
+	assert.Equal(t, 1, len(revisions))
+}
+
+// TestParallelMkcol ensures that, on an unit level, if multiple requests fight for creating a directory (race condition)
+// only the first one will create it. Note that there is little to synchronize here because if the folder is already
+// created, the underlying filesystem (not the storage driver layer) will fail when attempting to create the directory.
+func TestParallelMkcol(t *testing.T) {
+	ofs, err := New(config)
+	if err != nil {
+		t.Error(err)
+	}
+
+	for i:=0; i< 10; i++ {
+		t.Run("", func (t *testing.T) {
+			t.Parallel()
+			if err := ofs.CreateDir(ctx, "fightforit"); err != nil {
+				rinfo, err := ofs.GetMD(ctx, &provider.Reference{
+					Spec: &provider.Reference_Path{Path: "fightforit"},
+				}, nil)
+				if err != nil {
+					t.Error(err)
+				}
+
+				assert.NotNil(t, rinfo)
+			}
+		})
+	}
+}