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|
package main
import (
"bufio"
"bytes"
"fmt"
"io"
"log"
"os"
"path"
)
type ChunkReader interface {
io.Reader
io.ByteReader
}
type Chunk interface {
Reader() ChunkReader
}
type StoredChunk interface {
Chunk
Id() *ChunkId
}
type ChunkId struct {
Ver int
Idx uint64
}
func (i *ChunkId) Reader(repo string) ChunkReader {
p := path.Join(repo, fmt.Sprintf(versionFmt, i.Ver), chunksName, fmt.Sprintf(chunkIdFmt, i.Idx))
f, err := os.Open(p)
if err != nil {
log.Printf("Cannot open chunk %s\n", p)
}
return bufio.NewReaderSize(f, chunkSize)
}
func NewLoadedChunk(id *ChunkId, value []byte) *LoadedChunk {
return &LoadedChunk{id: id, value: value}
}
type LoadedChunk struct {
id *ChunkId
value []byte
}
func (c *LoadedChunk) Id() *ChunkId {
return c.id
}
func (c *LoadedChunk) Reader() ChunkReader {
// log.Printf("Chunk %d: Reading from in-memory value\n", c.id)
return bytes.NewReader(c.value)
}
func NewChunkFile(repo *Repo, id *ChunkId) *ChunkFile {
return &ChunkFile{repo: repo, id: id}
}
type ChunkFile struct {
repo *Repo
id *ChunkId
}
func (c *ChunkFile) Id() *ChunkId {
return c.id
}
func (c *ChunkFile) Reader() ChunkReader {
// log.Printf("Chunk %d: Reading from file\n", c.id)
return c.id.Reader(c.repo.path)
}
func NewTempChunk(value []byte) *TempChunk {
return &TempChunk{value: value}
}
type TempChunk struct {
value []byte
}
func (c *TempChunk) Reader() ChunkReader {
return bytes.NewReader(c.value)
}
|
