path: root/swarm/storage/netstore_test.go

// 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 (
    "encoding/hex"
    "errors"
    "io/ioutil"
    "testing"
    "time"

    "github.com/ethereum/go-ethereum/swarm/network"
)

var (
    errUnknown = errors.New("unknown error")
)

type mockRetrieve struct {
    requests map[string]int
}

func NewMockRetrieve() *mockRetrieve {
    return &mockRetrieve{requests: make(map[string]int)}
}

func newDummyChunk(addr Address) *Chunk {
    chunk := NewChunk(addr, make(chan bool))
    chunk.SData = []byte{3, 4, 5}
    chunk.Size = 3

    return chunk
}

func (m *mockRetrieve) retrieve(chunk *Chunk) error {
    hkey := hex.EncodeToString(chunk.Addr)
    m.requests[hkey] += 1

    // on second call return error
    if m.requests[hkey] == 2 {
        return errUnknown
    }

    // on third call return data
    if m.requests[hkey] == 3 {
        *chunk = *newDummyChunk(chunk.Addr)
        go func() {
            time.Sleep(100 * time.Millisecond)
            close(chunk.ReqC)
        }()

        return nil
    }

    return nil
}

func TestNetstoreFailedRequest(t *testing.T) {
    searchTimeout = 300 * time.Millisecond

    // setup
    addr := network.RandomAddr() // tested peers peer address

    // temp datadir
    datadir, err := ioutil.TempDir("", "netstore")
    if err != nil {
        t.Fatal(err)
    }
    params := NewDefaultLocalStoreParams()
    params.Init(datadir)
    params.BaseKey = addr.Over()
    localStore, err := NewTestLocalStoreForAddr(params)
    if err != nil {
        t.Fatal(err)
    }

    r := NewMockRetrieve()
    netStore := NewNetStore(localStore, r.retrieve)

    key := Address{}

    // first call is done by the retry on ErrChunkNotFound, no need to do it here
    // _, err = netStore.Get(key)
    // if err == nil || err != ErrChunkNotFound {
    //  t.Fatalf("expected to get ErrChunkNotFound, but got: %s", err)
    // }

    // second call
    _, err = netStore.Get(key)
    if got := r.requests[hex.EncodeToString(key)]; got != 2 {
        t.Fatalf("expected to have called retrieve two times, but got: %v", got)
    }
    if err != errUnknown {
        t.Fatalf("expected to get an unknown error, but got: %s", err)
    }

    // third call
    chunk, err := netStore.Get(key)
    if got := r.requests[hex.EncodeToString(key)]; got != 3 {
        t.Fatalf("expected to have called retrieve three times, but got: %v", got)
    }
    if err != nil || chunk == nil {
        t.Fatalf("expected to get a chunk but got: %v, %s", chunk, err)
    }
    if len(chunk.SData) != 3 {
        t.Fatalf("expected to get a chunk with size 3, but got: %v", chunk.SData)
    }
}