swarm/storage: Add unit test for hasherStore

swarm/storage/hasherstore_test.go

@@ -0,0 +1,125 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// 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 storage
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/binary"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/swarm/storage/encryption"
+
+	"github.com/ethereum/go-ethereum/common"
+)
+
+func TestHasherStore(t *testing.T) {
+	testHasherStore(10, false, t)
+	testHasherStore(100, false, t)
+	testHasherStore(1000, false, t)
+	testHasherStore(4096, false, t)
+	testHasherStore(10, true, t)
+	testHasherStore(100, true, t)
+	testHasherStore(1000, true, t)
+	testHasherStore(4096, true, t)
+}
+
+func testHasherStore(chunkLength int, toEncrypt bool, t *testing.T) {
+	chunkStore := newTestChunkStore()
+	hasherStore := NewHasherStore(chunkStore, MakeHashFunc(SHA3Hash), toEncrypt)
+
+	// Put two random chunks into the hasherStore
+
+	chunkData1 := generateRandomChunkData(chunkLength)
+	key1, err := hasherStore.Put(chunkData1)
+	if err != nil {
+		t.Fatalf("Expected no error got \"%v\"", err)
+	}
+
+	chunkData2 := generateRandomChunkData(chunkLength)
+	key2, err := hasherStore.Put(chunkData2)
+	if err != nil {
+		t.Fatalf("Expected no error got \"%v\"", err)
+	}
+
+	hasherStore.Close()
+
+	// Wait until chunks are really stored
+	hasherStore.Wait()
+
+	// Get the first chunk
+	retrievedChunkData1, err := hasherStore.Get(key1)
+	if err != nil {
+		t.Fatalf("Expected no error got \"%v\"", err)
+	}
+
+	// Retrieved data should be same as the original
+	if !bytes.Equal(chunkData1, retrievedChunkData1) {
+		t.Fatalf("Expected retrieved chunk data %v got %v", common.Bytes2Hex(chunkData1), common.Bytes2Hex(retrievedChunkData1))
+	}
+
+	// Get the second chunk
+	retrievedChunkData2, err := hasherStore.Get(key2)
+	if err != nil {
+		t.Fatalf("Expected no error got \"%v\"", err)
+	}
+
+	// Retrieved data should be same as the original
+	if !bytes.Equal(chunkData2, retrievedChunkData2) {
+		t.Fatalf("Expected retrieved chunk data %v got %v", common.Bytes2Hex(chunkData2), common.Bytes2Hex(retrievedChunkData2))
+	}
+
+	hash1, encryptionKey1, err := parseReference(key1)
+	if err != nil {
+		t.Fatalf("Expected no error got \"%v\"", err)
+	}
+
+	if toEncrypt {
+		if encryptionKey1 == nil {
+			t.Fatal("Expected non-nil encryption key got nil")
+		} else if len(encryptionKey1) != encryption.KeyLength {
+			t.Fatalf("Expected encryption key length %v got %v", encryption.KeyLength, len(encryptionKey1))
+		}
+	}
+	if !toEncrypt && encryptionKey1 != nil {
+		t.Fatalf("Expected nil encryption key got key with length %v", len(encryptionKey1))
+	}
+
+	// Check if chunk data in store is encrypted or not
+	chunkInStore, err := chunkStore.Get(hash1)
+	if err != nil {
+		t.Fatalf("Expected no error got \"%v\"", err)
+	}
+
+	chunkDataInStore := chunkInStore.SData
+
+	if toEncrypt && bytes.Equal(chunkData1, chunkDataInStore) {
+		t.Fatalf("Chunk expected to be encrypted but it is stored without encryption")
+	}
+	if !toEncrypt && !bytes.Equal(chunkData1, chunkDataInStore) {
+		t.Fatalf("Chunk expected to be not encrypted but stored content is different. Expected %v got %v", common.Bytes2Hex(chunkData1), common.Bytes2Hex(chunkDataInStore))
+	}
+
+}
+
+func generateRandomChunkData(length int) ChunkData {
+	chunkData := make([]byte, length)
+
+	rand.Read(chunkData)
+	binary.LittleEndian.PutUint64(chunkData[:8], uint64(len(chunkData)-8))
+	return chunkData
+}