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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 (
"bytes"
"crypto/rand"
"io"
"sync"
"testing"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
)
type limitedReader struct {
r io.Reader
off int64
size int64
}
func limitReader(r io.Reader, size int) *limitedReader {
return &limitedReader{r, 0, int64(size)}
}
func (self *limitedReader) Read(buf []byte) (int, error) {
limit := int64(len(buf))
left := self.size - self.off
if limit >= left {
limit = left
}
n, err := self.r.Read(buf[:limit])
if err == nil && limit == left {
err = io.EOF
}
self.off += int64(n)
return n, err
}
func testDataReader(l int) (r io.Reader) {
return limitReader(rand.Reader, l)
}
func testDataReaderAndSlice(l int) (r io.Reader, slice []byte) {
slice = make([]byte, l)
if _, err := rand.Read(slice); err != nil {
panic("rand error")
}
r = limitReader(bytes.NewReader(slice), l)
return
}
func testStore(m ChunkStore, l int64, branches int64, t *testing.T) {
chunkC := make(chan *Chunk)
go func() {
for chunk := range chunkC {
m.Put(chunk)
if chunk.wg != nil {
chunk.wg.Done()
}
}
}()
chunker := NewTreeChunker(&ChunkerParams{
Branches: branches,
Hash: defaultHash,
})
swg := &sync.WaitGroup{}
key, err := chunker.Split(rand.Reader, l, chunkC, swg, nil)
swg.Wait()
close(chunkC)
chunkC = make(chan *Chunk)
quit := make(chan bool)
go func() {
for ch := range chunkC {
go func(chunk *Chunk) {
storedChunk, err := m.Get(chunk.Key)
if err == notFound {
glog.V(logger.Detail).Infof("chunk '%v' not found", chunk.Key.Log())
} else if err != nil {
glog.V(logger.Detail).Infof("error retrieving chunk %v: %v", chunk.Key.Log(), err)
} else {
chunk.SData = storedChunk.SData
chunk.Size = storedChunk.Size
}
glog.V(logger.Detail).Infof("chunk '%v' not found", chunk.Key.Log())
close(chunk.C)
}(ch)
}
close(quit)
}()
r := chunker.Join(key, chunkC)
b := make([]byte, l)
n, err := r.ReadAt(b, 0)
if err != io.EOF {
t.Fatalf("read error (%v/%v) %v", n, l, err)
}
close(chunkC)
<-quit
}
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