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message.go
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message.go
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package message
import (
"io"
blocks "github.com/jbenet/go-ipfs/blocks"
pb "github.com/jbenet/go-ipfs/exchange/bitswap/message/internal/pb"
wantlist "github.com/jbenet/go-ipfs/exchange/bitswap/wantlist"
inet "github.com/jbenet/go-ipfs/p2p/net"
u "github.com/jbenet/go-ipfs/util"
ggio "github.com/jbenet/go-ipfs/Godeps/_workspace/src/code.google.com/p/gogoprotobuf/io"
proto "github.com/jbenet/go-ipfs/Godeps/_workspace/src/code.google.com/p/goprotobuf/proto"
)
// TODO move message.go into the bitswap package
// TODO move bs/msg/internal/pb to bs/internal/pb and rename pb package to bitswap_pb
type BitSwapMessage interface {
// Wantlist returns a slice of unique keys that represent data wanted by
// the sender.
Wantlist() []Entry
// Blocks returns a slice of unique blocks
Blocks() []*blocks.Block
// AddEntry adds an entry to the Wantlist.
AddEntry(key u.Key, priority int)
Cancel(key u.Key)
// Sets whether or not the contained wantlist represents the entire wantlist
// true = full wantlist
// false = wantlist 'patch'
// default: true
SetFull(isFull bool)
Full() bool
AddBlock(*blocks.Block)
Exportable
Loggable() map[string]interface{}
}
type Exportable interface {
ToProto() *pb.Message
ToNet(w io.Writer) error
}
type impl struct {
full bool
wantlist map[u.Key]Entry
blocks map[u.Key]*blocks.Block // map to detect duplicates
}
func New() BitSwapMessage {
return newMsg()
}
func newMsg() *impl {
return &impl{
blocks: make(map[u.Key]*blocks.Block),
wantlist: make(map[u.Key]Entry),
full: true,
}
}
type Entry struct {
wantlist.Entry
Cancel bool
}
func newMessageFromProto(pbm pb.Message) BitSwapMessage {
m := newMsg()
m.SetFull(pbm.GetWantlist().GetFull())
for _, e := range pbm.GetWantlist().GetEntries() {
m.addEntry(u.Key(e.GetBlock()), int(e.GetPriority()), e.GetCancel())
}
for _, d := range pbm.GetBlocks() {
b := blocks.NewBlock(d)
m.AddBlock(b)
}
return m
}
func (m *impl) SetFull(full bool) {
m.full = full
}
func (m *impl) Full() bool {
return m.full
}
func (m *impl) Wantlist() []Entry {
var out []Entry
for _, e := range m.wantlist {
out = append(out, e)
}
return out
}
func (m *impl) Blocks() []*blocks.Block {
bs := make([]*blocks.Block, 0)
for _, block := range m.blocks {
bs = append(bs, block)
}
return bs
}
func (m *impl) Cancel(k u.Key) {
m.addEntry(k, 0, true)
}
func (m *impl) AddEntry(k u.Key, priority int) {
m.addEntry(k, priority, false)
}
func (m *impl) addEntry(k u.Key, priority int, cancel bool) {
e, exists := m.wantlist[k]
if exists {
e.Priority = priority
e.Cancel = cancel
} else {
m.wantlist[k] = Entry{
Entry: wantlist.Entry{
Key: k,
Priority: priority,
},
Cancel: cancel,
}
}
}
func (m *impl) AddBlock(b *blocks.Block) {
m.blocks[b.Key()] = b
}
func FromNet(r io.Reader) (BitSwapMessage, error) {
pbr := ggio.NewDelimitedReader(r, inet.MessageSizeMax)
pb := new(pb.Message)
if err := pbr.ReadMsg(pb); err != nil {
return nil, err
}
m := newMessageFromProto(*pb)
return m, nil
}
func (m *impl) ToProto() *pb.Message {
pbm := new(pb.Message)
pbm.Wantlist = new(pb.Message_Wantlist)
for _, e := range m.wantlist {
pbm.Wantlist.Entries = append(pbm.Wantlist.Entries, &pb.Message_Wantlist_Entry{
Block: proto.String(string(e.Key)),
Priority: proto.Int32(int32(e.Priority)),
Cancel: &e.Cancel,
})
}
for _, b := range m.Blocks() {
pbm.Blocks = append(pbm.Blocks, b.Data)
}
return pbm
}
func (m *impl) ToNet(w io.Writer) error {
pbw := ggio.NewDelimitedWriter(w)
if err := pbw.WriteMsg(m.ToProto()); err != nil {
return err
}
return nil
}
func (m *impl) Loggable() map[string]interface{} {
var blocks []string
for _, v := range m.blocks {
blocks = append(blocks, v.Key().Pretty())
}
return map[string]interface{}{
"blocks": blocks,
"wants": m.Wantlist(),
}
}