github.com/alanchchen/go-ethereum@v1.6.6-0.20170601190819-6171d01b1195/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/log"
    28  )
    29  
    30  type brokenLimitedReader struct {
    31  	lr    io.Reader
    32  	errAt int
    33  	off   int
    34  	size  int
    35  }
    36  
    37  func brokenLimitReader(data io.Reader, size int, errAt int) *brokenLimitedReader {
    38  	return &brokenLimitedReader{
    39  		lr:    data,
    40  		errAt: errAt,
    41  		size:  size,
    42  	}
    43  }
    44  
    45  func testDataReader(l int) (r io.Reader) {
    46  	return io.LimitReader(rand.Reader, int64(l))
    47  }
    48  
    49  func (self *brokenLimitedReader) Read(buf []byte) (int, error) {
    50  	if self.off+len(buf) > self.errAt {
    51  		return 0, fmt.Errorf("Broken reader")
    52  	}
    53  	self.off += len(buf)
    54  	return self.lr.Read(buf)
    55  }
    56  
    57  func testDataReaderAndSlice(l int) (r io.Reader, slice []byte) {
    58  	slice = make([]byte, l)
    59  	if _, err := rand.Read(slice); err != nil {
    60  		panic("rand error")
    61  	}
    62  	r = io.LimitReader(bytes.NewReader(slice), int64(l))
    63  	return
    64  }
    65  
    66  func testStore(m ChunkStore, l int64, branches int64, t *testing.T) {
    67  
    68  	chunkC := make(chan *Chunk)
    69  	go func() {
    70  		for chunk := range chunkC {
    71  			m.Put(chunk)
    72  			if chunk.wg != nil {
    73  				chunk.wg.Done()
    74  			}
    75  		}
    76  	}()
    77  	chunker := NewTreeChunker(&ChunkerParams{
    78  		Branches: branches,
    79  		Hash:     defaultHash,
    80  	})
    81  	swg := &sync.WaitGroup{}
    82  	key, _ := chunker.Split(rand.Reader, l, chunkC, swg, nil)
    83  	swg.Wait()
    84  	close(chunkC)
    85  	chunkC = make(chan *Chunk)
    86  
    87  	quit := make(chan bool)
    88  
    89  	go func() {
    90  		for ch := range chunkC {
    91  			go func(chunk *Chunk) {
    92  				storedChunk, err := m.Get(chunk.Key)
    93  				if err == notFound {
    94  					log.Trace(fmt.Sprintf("chunk '%v' not found", chunk.Key.Log()))
    95  				} else if err != nil {
    96  					log.Trace(fmt.Sprintf("error retrieving chunk %v: %v", chunk.Key.Log(), err))
    97  				} else {
    98  					chunk.SData = storedChunk.SData
    99  					chunk.Size = storedChunk.Size
   100  				}
   101  				log.Trace(fmt.Sprintf("chunk '%v' not found", chunk.Key.Log()))
   102  				close(chunk.C)
   103  			}(ch)
   104  		}
   105  		close(quit)
   106  	}()
   107  	r := chunker.Join(key, chunkC)
   108  
   109  	b := make([]byte, l)
   110  	n, err := r.ReadAt(b, 0)
   111  	if err != io.EOF {
   112  		t.Fatalf("read error (%v/%v) %v", n, l, err)
   113  	}
   114  	close(chunkC)
   115  	<-quit
   116  }