path: root/swarm/storage/dpa_test.go

// Copyright 2016 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"
    "io"
    "io/ioutil"
    "os"
    "sync"
    "testing"
)

const testDataSize = 0x1000000

func TestDPArandom(t *testing.T) {
    dbStore := initDbStore(t)
    dbStore.setCapacity(50000)
    memStore := NewMemStore(dbStore, defaultCacheCapacity)
    localStore := &LocalStore{
        memStore,
        dbStore,
    }
    chunker := NewTreeChunker(NewChunkerParams())
    dpa := &DPA{
        Chunker:    chunker,
        ChunkStore: localStore,
    }
    dpa.Start()
    defer dpa.Stop()
    defer os.RemoveAll("/tmp/bzz")

    reader, slice := testDataReaderAndSlice(testDataSize)
    wg := &sync.WaitGroup{}
    key, err := dpa.Store(reader, testDataSize, wg, nil)
    if err != nil {
        t.Errorf("Store error: %v", err)
    }
    wg.Wait()
    resultReader := dpa.Retrieve(key)
    resultSlice := make([]byte, len(slice))
    n, err := resultReader.ReadAt(resultSlice, 0)
    if err != io.EOF {
        t.Errorf("Retrieve error: %v", err)
    }
    if n != len(slice) {
        t.Errorf("Slice size error got %d, expected %d.", n, len(slice))
    }
    if !bytes.Equal(slice, resultSlice) {
        t.Errorf("Comparison error.")
    }
    ioutil.WriteFile("/tmp/slice.bzz.16M", slice, 0666)
    ioutil.WriteFile("/tmp/result.bzz.16M", resultSlice, 0666)
    localStore.memStore = NewMemStore(dbStore, defaultCacheCapacity)
    resultReader = dpa.Retrieve(key)
    for i, _ := range resultSlice {
        resultSlice[i] = 0
    }
    n, err = resultReader.ReadAt(resultSlice, 0)
    if err != io.EOF {
        t.Errorf("Retrieve error after removing memStore: %v", err)
    }
    if n != len(slice) {
        t.Errorf("Slice size error after removing memStore got %d, expected %d.", n, len(slice))
    }
    if !bytes.Equal(slice, resultSlice) {
        t.Errorf("Comparison error after removing memStore.")
    }
}

func TestDPA_capacity(t *testing.T) {
    dbStore := initDbStore(t)
    memStore := NewMemStore(dbStore, defaultCacheCapacity)
    localStore := &LocalStore{
        memStore,
        dbStore,
    }
    memStore.setCapacity(0)
    chunker := NewTreeChunker(NewChunkerParams())
    dpa := &DPA{
        Chunker:    chunker,
        ChunkStore: localStore,
    }
    dpa.Start()
    reader, slice := testDataReaderAndSlice(testDataSize)
    wg := &sync.WaitGroup{}
    key, err := dpa.Store(reader, testDataSize, wg, nil)
    if err != nil {
        t.Errorf("Store error: %v", err)
    }
    wg.Wait()
    resultReader := dpa.Retrieve(key)
    resultSlice := make([]byte, len(slice))
    n, err := resultReader.ReadAt(resultSlice, 0)
    if err != io.EOF {
        t.Errorf("Retrieve error: %v", err)
    }
    if n != len(slice) {
        t.Errorf("Slice size error got %d, expected %d.", n, len(slice))
    }
    if !bytes.Equal(slice, resultSlice) {
        t.Errorf("Comparison error.")
    }
    // Clear memStore
    memStore.setCapacity(0)
    // check whether it is, indeed, empty
    dpa.ChunkStore = memStore
    resultReader = dpa.Retrieve(key)
    n, err = resultReader.ReadAt(resultSlice, 0)
    if err == nil {
        t.Errorf("Was able to read %d bytes from an empty memStore.", len(slice))
    }
    // check how it works with localStore
    dpa.ChunkStore = localStore
    //  localStore.dbStore.setCapacity(0)
    resultReader = dpa.Retrieve(key)
    for i, _ := range resultSlice {
        resultSlice[i] = 0
    }
    n, err = resultReader.ReadAt(resultSlice, 0)
    if err != io.EOF {
        t.Errorf("Retrieve error after clearing memStore: %v", err)
    }
    if n != len(slice) {
        t.Errorf("Slice size error after clearing memStore got %d, expected %d.", n, len(slice))
    }
    if !bytes.Equal(slice, resultSlice) {
        t.Errorf("Comparison error after clearing memStore.")
    }
}