path: root/ethdb/database_test.go

// Copyright 2014 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 ethdb_test

import (
    "bytes"
    "fmt"
    "io/ioutil"
    "os"
    "strconv"
    "sync"
    "testing"

    "github.com/ethereum/go-ethereum/ethdb"
)

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())
    }

    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) {
    testPutGet(ethdb.NewMemDatabase(), t)
}

func testPutGet(db ethdb.Database, t *testing.T) {
    t.Parallel()

    for _, k := range test_values {
        err := db.Put([]byte(k), nil)
        if err != nil {
            t.Fatalf("put failed: %v", err)
        }
    }

    for _, k := range test_values {
        data, err := db.Get([]byte(k))
        if err != nil {
            t.Fatalf("get failed: %v", err)
        }
        if len(data) != 0 {
            t.Fatalf("get returned wrong result, got %q expected nil", string(data))
        }
    }

    _, err := db.Get([]byte("non-exist-key"))
    if err == nil {
        t.Fatalf("expect to return a not found error")
    }

    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 {
        orig, err := db.Get([]byte(v))
        if err != nil {
            t.Fatalf("get failed: %v", err)
        }
        orig[0] = byte(0xff)
        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) {
    testParallelPutGet(ethdb.NewMemDatabase(), 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()
}