From 6f8c7b0defd4df773a1c9d630514016d3b914897 Mon Sep 17 00:00:00 2001
From: Egon Elbre <egonelbre@gmail.com>
Date: Tue, 8 Aug 2017 12:32:10 +0300
Subject: [PATCH] ethdb: add basic and parallel sanity tests (#14938)

* ethdb: add basic sanity test

* ethdb: test MemDatabase

* ethdb: add parallel tests
---
 ethdb/database_test.go | 161 ++++++++++++++++++++++++++++++++++++++---
 1 file changed, 152 insertions(+), 9 deletions(-)

diff --git a/ethdb/database_test.go b/ethdb/database_test.go
index 0e69a1218c..4740cdaedd 100644
--- a/ethdb/database_test.go
+++ b/ethdb/database_test.go
@@ -14,21 +14,164 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
-package ethdb
+package ethdb_test
 
 import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
 	"os"
-	"path/filepath"
+	"strconv"
+	"sync"
+	"testing"
 
-	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/ethdb"
 )
 
-func newDb() *LDBDatabase {
-	file := filepath.Join("/", "tmp", "ldbtesttmpfile")
-	if common.FileExist(file) {
-		os.RemoveAll(file)
+func newTestLDB() (*ethdb.LDBDatabase, func()) {
+	dirname, err := ioutil.TempDir(os.TempDir(), "ethdb_test_")
+	if err != nil {
+		panic("failed to create test file: " + err.Error())
+	}
+	db, err := ethdb.NewLDBDatabase(dirname, 0, 0)
+	if err != nil {
+		panic("failed to create test database: " + err.Error())
 	}
-	db, _ := NewLDBDatabase(file, 0, 0)
 
-	return db
+	return db, func() {
+		db.Close()
+		os.RemoveAll(dirname)
+	}
+}
+
+var test_values = []string{"", "a", "1251", "\x00123\x00"}
+
+func TestLDB_PutGet(t *testing.T) {
+	db, remove := newTestLDB()
+	defer remove()
+	testPutGet(db, t)
+}
+
+func TestMemoryDB_PutGet(t *testing.T) {
+	db, _ := ethdb.NewMemDatabase()
+	testPutGet(db, t)
+}
+
+func testPutGet(db ethdb.Database, t *testing.T) {
+	t.Parallel()
+
+	for _, v := range test_values {
+		err := db.Put([]byte(v), []byte(v))
+		if err != nil {
+			t.Fatalf("put failed: %v", err)
+		}
+	}
+
+	for _, v := range test_values {
+		data, err := db.Get([]byte(v))
+		if err != nil {
+			t.Fatalf("get failed: %v", err)
+		}
+		if !bytes.Equal(data, []byte(v)) {
+			t.Fatalf("get returned wrong result, got %q expected %q", string(data), v)
+		}
+	}
+
+	for _, v := range test_values {
+		err := db.Put([]byte(v), []byte("?"))
+		if err != nil {
+			t.Fatalf("put override failed: %v", err)
+		}
+	}
+
+	for _, v := range test_values {
+		data, err := db.Get([]byte(v))
+		if err != nil {
+			t.Fatalf("get failed: %v", err)
+		}
+		if !bytes.Equal(data, []byte("?")) {
+			t.Fatalf("get returned wrong result, got %q expected ?", string(data))
+		}
+	}
+
+	for _, v := range test_values {
+		err := db.Delete([]byte(v))
+		if err != nil {
+			t.Fatalf("delete %q failed: %v", v, err)
+		}
+	}
+
+	for _, v := range test_values {
+		_, err := db.Get([]byte(v))
+		if err == nil {
+			t.Fatalf("got deleted value %q", v)
+		}
+	}
+}
+
+func TestLDB_ParallelPutGet(t *testing.T) {
+	db, remove := newTestLDB()
+	defer remove()
+	testParallelPutGet(db, t)
+}
+
+func TestMemoryDB_ParallelPutGet(t *testing.T) {
+	db, _ := ethdb.NewMemDatabase()
+	testParallelPutGet(db, t)
+}
+
+func testParallelPutGet(db ethdb.Database, t *testing.T) {
+	const n = 8
+	var pending sync.WaitGroup
+
+	pending.Add(n)
+	for i := 0; i < n; i++ {
+		go func(key string) {
+			defer pending.Done()
+			err := db.Put([]byte(key), []byte("v"+key))
+			if err != nil {
+				panic("put failed: " + err.Error())
+			}
+		}(strconv.Itoa(i))
+	}
+	pending.Wait()
+
+	pending.Add(n)
+	for i := 0; i < n; i++ {
+		go func(key string) {
+			defer pending.Done()
+			data, err := db.Get([]byte(key))
+			if err != nil {
+				panic("get failed: " + err.Error())
+			}
+			if !bytes.Equal(data, []byte("v"+key)) {
+				panic(fmt.Sprintf("get failed, got %q expected %q", []byte(data), []byte("v"+key)))
+			}
+		}(strconv.Itoa(i))
+	}
+	pending.Wait()
+
+	pending.Add(n)
+	for i := 0; i < n; i++ {
+		go func(key string) {
+			defer pending.Done()
+			err := db.Delete([]byte(key))
+			if err != nil {
+				panic("delete failed: " + err.Error())
+			}
+		}(strconv.Itoa(i))
+	}
+	pending.Wait()
+
+	pending.Add(n)
+	for i := 0; i < n; i++ {
+		go func(key string) {
+			defer pending.Done()
+			_, err := db.Get([]byte(key))
+			if err == nil {
+				panic("get succeeded")
+			}
+		}(strconv.Itoa(i))
+	}
+	pending.Wait()
 }