/
mem.go
255 lines (210 loc) · 4.72 KB
/
mem.go
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package s3
import (
"bytes"
"crypto/md5"
"encoding/hex"
"fmt"
"io"
"sort"
"sync"
"github.com/adamwalz/keybase-client/go/libkb"
"golang.org/x/net/context"
)
type Mem struct {
mc *MemConn
mcMake sync.Once
}
var _ Root = &Mem{}
func (m *Mem) New(g *libkb.GlobalContext, signer Signer, region Region) Connection {
return m.NewMemConn()
}
type MemConn struct {
buckets map[string]*MemBucket
sync.Mutex
}
func (m *Mem) NewMemConn() *MemConn {
m.mcMake.Do(func() {
m.mc = &MemConn{
buckets: make(map[string]*MemBucket),
}
})
return m.mc
}
var _ Connection = &MemConn{}
func (s *MemConn) SetAccessKey(key string) {}
func (s *MemConn) Bucket(name string) BucketInt {
s.Lock()
defer s.Unlock()
b, ok := s.buckets[name]
if ok {
return b
}
b = NewMemBucket(s, name)
s.buckets[name] = b
return b
}
func (s *MemConn) AllMultis() []*MemMulti {
s.Lock()
defer s.Unlock()
var all []*MemMulti
for _, b := range s.buckets {
for _, m := range b.multis {
all = append(all, m)
}
}
return all
}
type MemBucket struct {
conn *MemConn
name string
objects map[string][]byte
multis map[string]*MemMulti
sync.Mutex
}
func NewMemBucket(conn *MemConn, name string) *MemBucket {
return &MemBucket{
conn: conn,
name: name,
objects: make(map[string][]byte),
multis: make(map[string]*MemMulti),
}
}
var _ BucketInt = &MemBucket{}
func (b *MemBucket) GetReader(ctx context.Context, path string) (io.ReadCloser, error) {
b.Lock()
defer b.Unlock()
obj, ok := b.objects[path]
if !ok {
return nil, fmt.Errorf("bucket %q, path %q does not exist", b.name, path)
}
return io.NopCloser(bytes.NewBuffer(obj)), nil
}
func (b *MemBucket) GetReaderWithRange(ctx context.Context, path string, begin, end int64) (io.ReadCloser, error) {
b.Lock()
defer b.Unlock()
obj, ok := b.objects[path]
if !ok {
return nil, fmt.Errorf("bucket %q, path %q does not exist", b.name, path)
}
if end >= int64(len(obj)) {
end = int64(len(obj))
}
return io.NopCloser(bytes.NewBuffer(obj[begin:end])), nil
}
func (b *MemBucket) PutReader(ctx context.Context, path string, r io.Reader, length int64, contType string, perm ACL, options Options) error {
b.Lock()
defer b.Unlock()
var buf bytes.Buffer
_, err := buf.ReadFrom(r)
if err != nil {
return err
}
b.objects[path] = buf.Bytes()
return nil
}
func (b *MemBucket) Del(ctx context.Context, path string) error {
b.Lock()
defer b.Unlock()
delete(b.objects, path)
return nil
}
func (b *MemBucket) setObject(path string, data []byte) {
b.Lock()
defer b.Unlock()
b.objects[path] = data
}
func (b *MemBucket) Multi(ctx context.Context, key, contType string, perm ACL) (MultiInt, error) {
b.Lock()
defer b.Unlock()
m, ok := b.multis[key]
if ok {
return m, nil
}
m = NewMemMulti(b, key)
b.multis[key] = m
return m, nil
}
type MemMulti struct {
bucket *MemBucket
path string
parts map[int]*part
numPutParts int
sync.Mutex
}
var _ MultiInt = &MemMulti{}
func NewMemMulti(b *MemBucket, path string) *MemMulti {
return &MemMulti{
bucket: b,
path: path,
parts: make(map[int]*part),
}
}
func (m *MemMulti) ListParts(ctx context.Context) ([]Part, error) {
m.Lock()
defer m.Unlock()
var ps []Part
for _, p := range m.parts {
ps = append(ps, p.export())
}
return ps, nil
}
func (m *MemMulti) Complete(ctx context.Context, parts []Part) error {
m.Lock()
defer m.Unlock()
// match parts coming in with existing parts
var scratch partList
for _, p := range parts {
if pp, ok := m.parts[p.N]; ok {
scratch = append(scratch, pp)
}
}
// assemble into one block
sort.Sort(scratch)
var buf bytes.Buffer
for _, p := range scratch {
buf.Write(p.data)
}
// store in bucket
m.bucket.setObject(m.path, buf.Bytes())
return nil
}
func (m *MemMulti) PutPart(ctx context.Context, index int, r io.ReadSeeker) (Part, error) {
m.Lock()
defer m.Unlock()
var buf bytes.Buffer
_, err := buf.ReadFrom(r)
if err != nil {
return Part{}, err
}
p := newPart(index, buf)
m.parts[index] = p
m.numPutParts++
return p.export(), nil
}
// NumPutParts returns the number of times PutPart was called.
func (m *MemMulti) NumPutParts() int {
m.Lock()
defer m.Unlock()
return m.numPutParts
}
type part struct {
index int
hash string
data []byte
}
func newPart(index int, buf bytes.Buffer) *part {
p := &part{
index: index,
data: buf.Bytes(),
}
h := md5.Sum(p.data)
p.hash = hex.EncodeToString(h[:])
return p
}
func (p *part) export() Part {
return Part{N: p.index, ETag: `"` + p.hash + `"`, Size: int64(len(p.data))}
}
type partList []*part
func (x partList) Len() int { return len(x) }
func (x partList) Less(a, b int) bool { return x[a].index < x[b].index }
func (x partList) Swap(a, b int) { x[a], x[b] = x[b], x[a] }