github.com/murrekatt/go-ethereum@v1.5.8-0.20170123175102-fc52f2c007fb/swarm/storage/common_test.go (about)

     1  // Copyright 2016 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package storage
    18  
    19  import (
    20  	"bytes"
    21  	"crypto/rand"
    22  	"fmt"
    23  	"io"
    24  	"sync"
    25  	"testing"
    26  
    27  	"github.com/ethereum/go-ethereum/logger"
    28  	"github.com/ethereum/go-ethereum/logger/glog"
    29  )
    30  
    31  type brokenLimitedReader struct {
    32  	lr    io.Reader
    33  	errAt int
    34  	off   int
    35  	size  int
    36  }
    37  
    38  func brokenLimitReader(data io.Reader, size int, errAt int) *brokenLimitedReader {
    39  	return &brokenLimitedReader{
    40  		lr:    data,
    41  		errAt: errAt,
    42  		size:  size,
    43  	}
    44  }
    45  
    46  func testDataReader(l int) (r io.Reader) {
    47  	return io.LimitReader(rand.Reader, int64(l))
    48  }
    49  
    50  func (self *brokenLimitedReader) Read(buf []byte) (int, error) {
    51  	if self.off+len(buf) > self.errAt {
    52  		return 0, fmt.Errorf("Broken reader")
    53  	}
    54  	self.off += len(buf)
    55  	return self.lr.Read(buf)
    56  }
    57  
    58  func testDataReaderAndSlice(l int) (r io.Reader, slice []byte) {
    59  	slice = make([]byte, l)
    60  	if _, err := rand.Read(slice); err != nil {
    61  		panic("rand error")
    62  	}
    63  	r = io.LimitReader(bytes.NewReader(slice), int64(l))
    64  	return
    65  }
    66  
    67  func testStore(m ChunkStore, l int64, branches int64, t *testing.T) {
    68  
    69  	chunkC := make(chan *Chunk)
    70  	go func() {
    71  		for chunk := range chunkC {
    72  			m.Put(chunk)
    73  			if chunk.wg != nil {
    74  				chunk.wg.Done()
    75  			}
    76  		}
    77  	}()
    78  	chunker := NewTreeChunker(&ChunkerParams{
    79  		Branches: branches,
    80  		Hash:     defaultHash,
    81  	})
    82  	swg := &sync.WaitGroup{}
    83  	key, _ := chunker.Split(rand.Reader, l, chunkC, swg, nil)
    84  	swg.Wait()
    85  	close(chunkC)
    86  	chunkC = make(chan *Chunk)
    87  
    88  	quit := make(chan bool)
    89  
    90  	go func() {
    91  		for ch := range chunkC {
    92  			go func(chunk *Chunk) {
    93  				storedChunk, err := m.Get(chunk.Key)
    94  				if err == notFound {
    95  					glog.V(logger.Detail).Infof("chunk '%v' not found", chunk.Key.Log())
    96  				} else if err != nil {
    97  					glog.V(logger.Detail).Infof("error retrieving chunk %v: %v", chunk.Key.Log(), err)
    98  				} else {
    99  					chunk.SData = storedChunk.SData
   100  					chunk.Size = storedChunk.Size
   101  				}
   102  				glog.V(logger.Detail).Infof("chunk '%v' not found", chunk.Key.Log())
   103  				close(chunk.C)
   104  			}(ch)
   105  		}
   106  		close(quit)
   107  	}()
   108  	r := chunker.Join(key, chunkC)
   109  
   110  	b := make([]byte, l)
   111  	n, err := r.ReadAt(b, 0)
   112  	if err != io.EOF {
   113  		t.Fatalf("read error (%v/%v) %v", n, l, err)
   114  	}
   115  	close(chunkC)
   116  	<-quit
   117  }