/
net.go
426 lines (337 loc) · 7.94 KB
/
net.go
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package blockstore
import (
"bytes"
"context"
"encoding/binary"
"fmt"
"sync"
"sync/atomic"
blocks "github.com/ipfs/go-block-format"
"github.com/ipfs/go-cid"
ipld "github.com/ipfs/go-ipld-format"
"github.com/libp2p/go-msgio"
cbg "github.com/whyrusleeping/cbor-gen"
"golang.org/x/xerrors"
)
type NetRPCReqType byte
const (
NRpcHas NetRPCReqType = iota
NRpcGet
NRpcGetSize
NRpcPut
NRpcDelete
// todo cancel req
)
type NetRPCRespType byte
const (
NRpcOK NetRPCRespType = iota
NRpcErr
NRpcMore
)
type NetRPCErrType byte
const (
NRpcErrGeneric NetRPCErrType = iota
NRpcErrNotFound
)
type NetRpcReq struct {
Type NetRPCReqType
ID uint64
Cid []cid.Cid // todo maxsize?
Data [][]byte // todo maxsize?
}
type NetRpcResp struct {
Type NetRPCRespType
ID uint64
// error or cids in allkeys
Data []byte // todo maxsize?
next <-chan NetRpcResp
}
type NetRpcErr struct {
Type NetRPCErrType
Msg string
// in case of NRpcErrNotFound
Cid *cid.Cid
}
type NetworkStore struct {
// note: writer is thread-safe
msgStream msgio.ReadWriteCloser
// atomic
reqCount uint64
respLk sync.Mutex
// respMap is nil after store closes
respMap map[uint64]chan<- NetRpcResp
closing chan struct{}
closed chan struct{}
closeLk sync.Mutex
onClose []func()
}
func NewNetworkStore(mss msgio.ReadWriteCloser) *NetworkStore {
ns := &NetworkStore{
msgStream: mss,
respMap: map[uint64]chan<- NetRpcResp{},
closing: make(chan struct{}),
closed: make(chan struct{}),
}
go ns.receive()
return ns
}
func (n *NetworkStore) shutdown(msg string) {
if err := n.msgStream.Close(); err != nil {
log.Errorw("closing netstore msg stream", "error", err)
}
nerr := NetRpcErr{
Type: NRpcErrGeneric,
Msg: msg,
Cid: nil,
}
var errb bytes.Buffer
if err := nerr.MarshalCBOR(&errb); err != nil {
log.Errorw("netstore shutdown: error marshaling error", "err", err)
}
n.respLk.Lock()
for id, resps := range n.respMap {
resps <- NetRpcResp{
Type: NRpcErr,
ID: id,
Data: errb.Bytes(),
}
}
n.respMap = nil
n.respLk.Unlock()
}
func (n *NetworkStore) OnClose(cb func()) {
n.closeLk.Lock()
defer n.closeLk.Unlock()
select {
case <-n.closed:
cb()
default:
n.onClose = append(n.onClose, cb)
}
}
func (n *NetworkStore) receive() {
defer func() {
n.closeLk.Lock()
defer n.closeLk.Unlock()
close(n.closed)
if n.onClose != nil {
for _, f := range n.onClose {
f()
}
}
}()
for {
select {
case <-n.closing:
n.shutdown("netstore stopping")
return
default:
}
msg, err := n.msgStream.ReadMsg()
if err != nil {
n.shutdown(fmt.Sprintf("netstore ReadMsg: %s", err))
return
}
var resp NetRpcResp
if err := resp.UnmarshalCBOR(bytes.NewReader(msg)); err != nil {
n.shutdown(fmt.Sprintf("unmarshaling netstore response: %s", err))
return
}
n.msgStream.ReleaseMsg(msg)
n.respLk.Lock()
if ch, ok := n.respMap[resp.ID]; ok {
if resp.Type == NRpcMore {
nch := make(chan NetRpcResp, 1)
resp.next = nch
n.respMap[resp.ID] = nch
} else {
delete(n.respMap, resp.ID)
}
ch <- resp
}
n.respLk.Unlock()
}
}
func (n *NetworkStore) sendRpc(rt NetRPCReqType, cids []cid.Cid, data [][]byte) (uint64, <-chan NetRpcResp, error) {
rid := atomic.AddUint64(&n.reqCount, 1)
respCh := make(chan NetRpcResp, 1) // todo pool?
n.respLk.Lock()
if n.respMap == nil {
n.respLk.Unlock()
return 0, nil, xerrors.Errorf("netstore closed")
}
n.respMap[rid] = respCh
n.respLk.Unlock()
req := NetRpcReq{
Type: rt,
ID: rid,
Cid: cids,
Data: data,
}
var rbuf bytes.Buffer // todo buffer pool
if err := req.MarshalCBOR(&rbuf); err != nil {
n.respLk.Lock()
defer n.respLk.Unlock()
if n.respMap == nil {
return 0, nil, xerrors.Errorf("netstore closed")
}
delete(n.respMap, rid)
return 0, nil, err
}
if err := n.msgStream.WriteMsg(rbuf.Bytes()); err != nil {
n.respLk.Lock()
defer n.respLk.Unlock()
if n.respMap == nil {
return 0, nil, xerrors.Errorf("netstore closed")
}
delete(n.respMap, rid)
return 0, nil, err
}
return rid, respCh, nil
}
func (n *NetworkStore) waitResp(ctx context.Context, rch <-chan NetRpcResp, rid uint64) (NetRpcResp, error) {
select {
case resp := <-rch:
if resp.Type == NRpcErr {
var e NetRpcErr
if err := e.UnmarshalCBOR(bytes.NewReader(resp.Data)); err != nil {
return NetRpcResp{}, xerrors.Errorf("unmarshaling error data: %w", err)
}
var err error
switch e.Type {
case NRpcErrNotFound:
if e.Cid != nil {
err = ipld.ErrNotFound{
Cid: *e.Cid,
}
} else {
err = xerrors.Errorf("block not found, but cid was null")
}
case NRpcErrGeneric:
err = xerrors.Errorf("generic error")
default:
err = xerrors.Errorf("unknown error type")
}
return NetRpcResp{}, xerrors.Errorf("netstore error response: %s (%w)", e.Msg, err)
}
return resp, nil
case <-ctx.Done():
// todo send cancel req
n.respLk.Lock()
if n.respMap != nil {
delete(n.respMap, rid)
}
n.respLk.Unlock()
return NetRpcResp{}, ctx.Err()
}
}
func (n *NetworkStore) Has(ctx context.Context, c cid.Cid) (bool, error) {
req, rch, err := n.sendRpc(NRpcHas, []cid.Cid{c}, nil)
if err != nil {
return false, err
}
resp, err := n.waitResp(ctx, rch, req)
if err != nil {
return false, err
}
if len(resp.Data) != 1 {
return false, xerrors.Errorf("expected reposnse length to be 1 byte")
}
switch resp.Data[0] {
case cbg.CborBoolTrue[0]:
return true, nil
case cbg.CborBoolFalse[0]:
return false, nil
default:
return false, xerrors.Errorf("has: bad response: %x", resp.Data[0])
}
}
func (n *NetworkStore) Get(ctx context.Context, c cid.Cid) (blocks.Block, error) {
req, rch, err := n.sendRpc(NRpcGet, []cid.Cid{c}, nil)
if err != nil {
return nil, err
}
resp, err := n.waitResp(ctx, rch, req)
if err != nil {
return nil, err
}
return blocks.NewBlockWithCid(resp.Data, c)
}
func (n *NetworkStore) View(ctx context.Context, c cid.Cid, callback func([]byte) error) error {
req, rch, err := n.sendRpc(NRpcGet, []cid.Cid{c}, nil)
if err != nil {
return err
}
resp, err := n.waitResp(ctx, rch, req)
if err != nil {
return err
}
return callback(resp.Data) // todo return buf to pool
}
func (n *NetworkStore) GetSize(ctx context.Context, c cid.Cid) (int, error) {
req, rch, err := n.sendRpc(NRpcGetSize, []cid.Cid{c}, nil)
if err != nil {
return 0, err
}
resp, err := n.waitResp(ctx, rch, req)
if err != nil {
return 0, err
}
if len(resp.Data) != 4 {
return 0, xerrors.Errorf("expected getsize response to be 4 bytes, was %d", resp.Data)
}
return int(binary.LittleEndian.Uint32(resp.Data)), nil
}
func (n *NetworkStore) Put(ctx context.Context, block blocks.Block) error {
return n.PutMany(ctx, []blocks.Block{block})
}
func (n *NetworkStore) PutMany(ctx context.Context, blocks []blocks.Block) error {
// todo pool
cids := make([]cid.Cid, len(blocks))
blkDatas := make([][]byte, len(blocks))
for i, block := range blocks {
cids[i] = block.Cid()
blkDatas[i] = block.RawData()
}
req, rch, err := n.sendRpc(NRpcPut, cids, blkDatas)
if err != nil {
return err
}
_, err = n.waitResp(ctx, rch, req)
if err != nil {
return err
}
return nil
}
func (n *NetworkStore) DeleteBlock(ctx context.Context, c cid.Cid) error {
return n.DeleteMany(ctx, []cid.Cid{c})
}
func (n *NetworkStore) DeleteMany(ctx context.Context, cids []cid.Cid) error {
req, rch, err := n.sendRpc(NRpcDelete, cids, nil)
if err != nil {
return err
}
_, err = n.waitResp(ctx, rch, req)
if err != nil {
return err
}
return nil
}
func (n *NetworkStore) AllKeysChan(ctx context.Context) (<-chan cid.Cid, error) {
return nil, xerrors.Errorf("not supported")
}
func (n *NetworkStore) HashOnRead(enabled bool) {
// todo
return
}
func (*NetworkStore) Flush(context.Context) error { return nil }
func (n *NetworkStore) Stop(ctx context.Context) error {
close(n.closing)
select {
case <-n.closed:
return nil
case <-ctx.Done():
return ctx.Err()
}
}
var _ Blockstore = &NetworkStore{}