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// 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 (
    "context"
    "testing"

    "github.com/dexon-foundation/dexon/swarm/log"
)

func newTestMemStore() *MemStore {
    storeparams := NewDefaultStoreParams()
    return NewMemStore(storeparams, nil)
}

func testMemStoreRandom(n int, t *testing.T) {
    m := newTestMemStore()
    defer m.Close()
    testStoreRandom(m, n, t)
}

func testMemStoreCorrect(n int, t *testing.T) {
    m := newTestMemStore()
    defer m.Close()
    testStoreCorrect(m, n, t)
}

func TestMemStoreRandom_1(t *testing.T) {
    testMemStoreRandom(1, t)
}

func TestMemStoreCorrect_1(t *testing.T) {
    testMemStoreCorrect(1, t)
}

func TestMemStoreRandom_1k(t *testing.T) {
    testMemStoreRandom(1000, t)
}

func TestMemStoreCorrect_1k(t *testing.T) {
    testMemStoreCorrect(100, t)
}

func TestMemStoreNotFound(t *testing.T) {
    m := newTestMemStore()
    defer m.Close()

    _, err := m.Get(context.TODO(), ZeroAddr)
    if err != ErrChunkNotFound {
        t.Errorf("Expected ErrChunkNotFound, got %v", err)
    }
}

func benchmarkMemStorePut(n int, b *testing.B) {
    m := newTestMemStore()
    defer m.Close()
    benchmarkStorePut(m, n, b)
}

func benchmarkMemStoreGet(n int, b *testing.B) {
    m := newTestMemStore()
    defer m.Close()
    benchmarkStoreGet(m, n, b)
}

func BenchmarkMemStorePut_500(b *testing.B) {
    benchmarkMemStorePut(500, b)
}

func BenchmarkMemStoreGet_500(b *testing.B) {
    benchmarkMemStoreGet(500, b)
}

func TestMemStoreAndLDBStore(t *testing.T) {
    ldb, cleanup := newLDBStore(t)
    ldb.setCapacity(4000)
    defer cleanup()

    cacheCap := 200
    memStore := NewMemStore(NewStoreParams(4000, 200, nil, nil), nil)

    tests := []struct {
        n         int   // number of chunks to push to memStore
        chunkSize int64 // size of chunk (by default in Swarm - 4096)
    }{
        {
            n:         1,
            chunkSize: 4096,
        },
        {
            n:         101,
            chunkSize: 4096,
        },
        {
            n:         501,
            chunkSize: 4096,
        },
        {
            n:         1100,
            chunkSize: 4096,
        },
    }

    for i, tt := range tests {
        log.Info("running test", "idx", i, "tt", tt)
        var chunks []Chunk

        for i := 0; i < tt.n; i++ {
            c := GenerateRandomChunk(tt.chunkSize)
            chunks = append(chunks, c)
        }

        for i := 0; i < tt.n; i++ {
            err := ldb.Put(context.TODO(), chunks[i])
            if err != nil {
                t.Fatal(err)
            }
            err = memStore.Put(context.TODO(), chunks[i])
            if err != nil {
                t.Fatal(err)
            }

            if got := memStore.cache.Len(); got > cacheCap {
                t.Fatalf("expected to get cache capacity less than %v, but got %v", cacheCap, got)
            }

        }

        for i := 0; i < tt.n; i++ {
            _, err := memStore.Get(context.TODO(), chunks[i].Address())
            if err != nil {
                if err == ErrChunkNotFound {
                    _, err := ldb.Get(context.TODO(), chunks[i].Address())
                    if err != nil {
                        t.Fatalf("couldn't get chunk %v from ldb, got error: %v", i, err)
                    }
                } else {
                    t.Fatalf("got error from memstore: %v", err)
                }
            }
        }
    }
}