LBRYCommunity/reflector.go
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fixed a few reflector issues, added some tests

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This commit is contained in:
Alex Grintsvayg 2018-08-09 14:56:49 -04:00
parent 3855d5c281
commit 73f3aceca6
9 changed files with 340 additions and 189 deletions
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9
Gopkg.lock generated
View file

@ -255,6 +255,14 @@
revision = "0db1d5eae1116bf7c8ed96c6749acfbf4daaec3e"
version = "v0.3.0"
[[projects]]
branch = "master"
digest = "1:d38c630298ac75e214f3caa5c240ea2923c7a089824d175ba4107d0650d56579"
name = "github.com/phayes/freeport"
packages = ["."]
pruneopts = ""
revision = "e27662a4a9d6b2083dfd7e7b5d0e30985daca925"
[[projects]]
branch = "master"
digest = "1:6ee36f2cea425916d81fdaaf983469fc18f91b3cf090cfe90fa0a9d85b8bfab7"
@ -398,6 +406,7 @@
"github.com/lbryio/lbry.go/stop",
"github.com/lbryio/lbry.go/util",
"github.com/lyoshenka/bencode",
"github.com/phayes/freeport",
"github.com/sebdah/goldie",
"github.com/sirupsen/logrus",
"github.com/spf13/cast",

4
Gopkg.toml
View file

@ -29,3 +29,7 @@
[[constraint]]
branch = "master"
name = "github.com/uber-go/atomic"
[[constraint]]
branch = "master"
name = "github.com/phayes/freeport"

6
cmd/reflector.go
View file

@ -9,8 +9,8 @@ import (
"github.com/lbryio/reflector.go/db"
"github.com/lbryio/reflector.go/reflector"
"github.com/lbryio/reflector.go/store"
log "github.com/sirupsen/logrus"
log "github.com/sirupsen/logrus"
"github.com/spf13/cobra"
)
@ -26,7 +26,9 @@ func init() {
func reflectorCmd(cmd *cobra.Command, args []string) {
db := new(db.SQL)
err := db.Connect(globalConfig.DBConn)
checkErr(err)
if err != nil {
log.Fatal(err)
}
s3 := store.NewS3BlobStore(globalConfig.AwsID, globalConfig.AwsSecret, globalConfig.BucketRegion, globalConfig.BucketName)
combo := store.NewDBBackedS3Store(s3, db)

1
dht/dht_announce.go
View file

@ -9,6 +9,7 @@ import (
"github.com/lbryio/lbry.go/errors"
"github.com/lbryio/reflector.go/dht/bits"
"golang.org/x/time/rate"
)

15
reflector/client.go
View file

@ -9,6 +9,9 @@ import (
log "github.com/sirupsen/logrus"
)
// ErrBlobExists is a default error for when a blob already exists on the reflector server.
var ErrBlobExists = errors.Base("blob exists on server")
// Client is an instance of a client connected to a server.
type Client struct {
conn net.Conn
@ -18,7 +21,7 @@ type Client struct {
// Connect connects to a specific clients and errors if it cannot be contacted.
func (c *Client) Connect(address string) error {
var err error
c.conn, err = net.Dial("tcp", address)
c.conn, err = net.Dial(network, address)
if err != nil {
return err
}
@ -38,8 +41,10 @@ func (c *Client) SendBlob(blob []byte) error {
return errors.Err("not connected")
}
if len(blob) != maxBlobSize {
return errors.Err("blob must be exactly " + strconv.Itoa(maxBlobSize) + " bytes")
if len(blob) > maxBlobSize {
return errors.Err("blob must be at most " + strconv.Itoa(maxBlobSize) + " bytes")
} else if len(blob) == 0 {
return errors.Err("blob is empty")
}
blobHash := getBlobHash(blob)
@ -50,6 +55,7 @@ func (c *Client) SendBlob(blob []byte) error {
if err != nil {
return err
}
_, err = c.conn.Write(sendRequest)
if err != nil {
return err
@ -102,8 +108,7 @@ func (c *Client) doHandshake(version int) error {
}
var resp handshakeRequestResponse
dec := json.NewDecoder(c.conn)
err = dec.Decode(&resp)
err = json.NewDecoder(c.conn).Decode(&resp)
if err != nil {
return err
} else if resp.Version != version {

70
reflector/client_test.go
View file

@ -1,70 +0,0 @@
package reflector
import (
"crypto/rand"
"io/ioutil"
"os"
"strconv"
"testing"
"github.com/lbryio/reflector.go/store"
log "github.com/sirupsen/logrus"
)
var address = "localhost:" + strconv.Itoa(DefaultPort)
func TestMain(m *testing.M) {
dir, err := ioutil.TempDir("", "reflector_client_test")
if err != nil {
log.Panic("could not create temp directory - ", err)
}
defer func(directory string) {
err := os.RemoveAll(dir)
if err != nil {
log.Panic("error removing files and directory - ", err)
}
}(dir)
ms := store.MemoryBlobStore{}
s := NewServer(&ms)
go func() {
err := s.Start(address)
if err != nil {
log.Panic("error starting up reflector server - ", err)
}
}()
os.Exit(m.Run())
}
func TestNotConnected(t *testing.T) {
c := Client{}
err := c.SendBlob([]byte{})
if err == nil {
t.Error("client should error if it is not connected")
}
}
func TestSmallBlob(t *testing.T) {
c := Client{}
err := c.Connect(address)
if err != nil {
t.Error("error connecting client to server - ", err)
}
err = c.SendBlob([]byte{})
if err == nil {
t.Error("client should error if blob is empty")
}
blob := make([]byte, 1000)
_, err = rand.Read(blob)
if err != nil {
t.Error("failed to make random blob")
}
err = c.SendBlob([]byte{})
if err == nil {
t.Error("client should error if blob is the wrong size")
}
}

196
reflector/server.go
View file

@ -2,23 +2,38 @@ package reflector
import (
"bufio"
"crypto/sha512"
"encoding/hex"
"encoding/json"
"io"
"net"
"strconv"
"time"
"github.com/lbryio/reflector.go/store"
"github.com/lbryio/lbry.go/errors"
"github.com/lbryio/lbry.go/stop"
"github.com/lbryio/reflector.go/store"
log "github.com/sirupsen/logrus"
)
const (
// DefaultPort is the port the reflector server listens on if not passed in.
DefaultPort = 5566
// DefaultTimeout is the default timeout to read or write the next message
DefaultTimeout = 5 * time.Second
network = "tcp4"
protocolVersion1 = 0
protocolVersion2 = 1
maxBlobSize = 2 * 1024 * 1024
)
// Server is and instance of the reflector server. It houses the blob store and listener.
type Server struct {
store store.BlobStore
closed bool
timeout time.Duration // timeout to read or write next message
grp *stop.Group
}
@ -27,6 +42,7 @@ func NewServer(store store.BlobStore) *Server {
return &Server{
store: store,
grp: stop.New(),
timeout: DefaultTimeout,
}
}
@ -37,16 +53,23 @@ func (s *Server) Shutdown() {
log.Debug("reflector server stopped")
}
//Start starts the server listener to handle connections.
//Start starts the server to handle connections.
func (s *Server) Start(address string) error {
//ToDo - We should make this DRY as it is the same code in both servers.
log.Println("reflector listening on " + address)
l, err := net.Listen("tcp4", address)
l, err := net.Listen(network, address)
if err != nil {
return err
return errors.Err(err)
}
go s.listenForShutdown(l)
s.grp.Add(1)
go func() {
<-s.grp.Ch()
err := l.Close()
if err != nil {
log.Error(errors.Prefix("closing listener", err))
}
s.grp.Done()
}()
s.grp.Add(1)
go func() {
@ -57,20 +80,11 @@ func (s *Server) Start(address string) error {
return nil
}
func (s *Server) listenForShutdown(listener net.Listener) {
<-s.grp.Ch()
s.closed = true
err := listener.Close()
if err != nil {
log.Error("error closing listener for peer server - ", err)
}
}
func (s *Server) listenAndServe(listener net.Listener) {
for {
conn, err := listener.Accept()
if err != nil {
if s.closed {
if s.quitting() {
return
}
log.Error(err)
@ -85,22 +99,32 @@ func (s *Server) listenAndServe(listener net.Listener) {
}
func (s *Server) handleConn(conn net.Conn) {
// all this stuff is to close the connections correctly when we're shutting down the server
connNeedsClosing := make(chan struct{})
defer func() {
if err := conn.Close(); err != nil {
close(connNeedsClosing)
}()
s.grp.Add(1)
go func() {
defer s.grp.Done()
select {
case <-connNeedsClosing:
case <-s.grp.Ch():
}
err := conn.Close()
if err != nil {
log.Error(errors.Prefix("closing peer conn", err))
}
}()
// TODO: connection should time out eventually
err := s.doHandshake(conn)
if err != nil {
if err == io.EOF {
if err == io.EOF || s.quitting() {
return
}
err := s.doError(conn, err)
if err != nil {
log.Error("error sending error response to reflector client connection - ", err)
log.Error(errors.Prefix("sending handshake error", err))
}
return
}
@ -108,11 +132,12 @@ func (s *Server) handleConn(conn net.Conn) {
for {
err = s.receiveBlob(conn)
if err != nil {
if err != io.EOF {
if err == io.EOF || s.quitting() {
return
}
err := s.doError(conn, err)
if err != nil {
log.Error("error sending error response for receiving a blob to reflector client connection - ", err)
}
log.Error(errors.Prefix("sending blob receive error", err))
}
return
}
@ -120,7 +145,7 @@ func (s *Server) handleConn(conn net.Conn) {
}
func (s *Server) doError(conn net.Conn, err error) error {
log.Errorln(err)
log.Errorln(errors.FullTrace(err))
if e2, ok := err.(*json.SyntaxError); ok {
log.Printf("syntax error at byte offset %d", e2.Offset)
}
@ -128,8 +153,7 @@ func (s *Server) doError(conn net.Conn, err error) error {
if err != nil {
return err
}
_, err = conn.Write(resp)
return err
return s.write(conn, resp)
}
func (s *Server) receiveBlob(conn net.Conn) error {
@ -165,8 +189,7 @@ func (s *Server) receiveBlob(conn net.Conn) error {
return nil
}
blob := make([]byte, blobSize)
_, err = io.ReadFull(bufio.NewReader(conn), blob)
blob, err := s.readRawBlob(conn, blobSize)
if err != nil {
return err
}
@ -193,7 +216,7 @@ func (s *Server) receiveBlob(conn net.Conn) error {
func (s *Server) doHandshake(conn net.Conn) error {
var handshake handshakeRequestResponse
err := json.NewDecoder(conn).Decode(&handshake)
err := s.read(conn, &handshake)
if err != nil {
return err
} else if handshake.Version != protocolVersion1 && handshake.Version != protocolVersion2 {
@ -205,29 +228,20 @@ func (s *Server) doHandshake(conn net.Conn) error {
return err
}
_, err = conn.Write(resp)
return err
return s.write(conn, resp)
}
func (s *Server) readBlobRequest(conn net.Conn) (int, string, bool, error) {
var sendRequest sendBlobRequest
err := json.NewDecoder(conn).Decode(&sendRequest)
err := s.read(conn, &sendRequest)
if err != nil {
return 0, "", false, err
}
if sendRequest.SdBlobHash != "" && sendRequest.BlobHash != "" {
return 0, "", false, errors.Err("invalid request")
}
var blobHash string
var blobSize int
isSdBlob := sendRequest.SdBlobHash != ""
if blobSize > maxBlobSize {
return 0, "", isSdBlob, errors.Err("blob cannot be more than " + strconv.Itoa(maxBlobSize) + " bytes")
}
if isSdBlob {
blobSize = sendRequest.SdBlobSize
blobHash = sendRequest.SdBlobHash
@ -236,6 +250,16 @@ func (s *Server) readBlobRequest(conn net.Conn) (int, string, bool, error) {
blobHash = sendRequest.BlobHash
}
if blobHash == "" {
return blobSize, blobHash, isSdBlob, errors.Err("blob hash is empty")
}
if blobSize > maxBlobSize {
return blobSize, blobHash, isSdBlob, errors.Err("blob must be at most " + strconv.Itoa(maxBlobSize) + " bytes")
}
if blobSize == 0 {
return blobSize, blobHash, isSdBlob, errors.Err("0-byte blob received")
}
return blobSize, blobHash, isSdBlob, nil
}
@ -252,8 +276,7 @@ func (s *Server) sendBlobResponse(conn net.Conn, blobExists, isSdBlob bool) erro
return err
}
_, err = conn.Write(response)
return err
return s.write(conn, response)
}
func (s *Server) sendTransferResponse(conn net.Conn, receivedBlob, isSdBlob bool) error {
@ -262,7 +285,6 @@ func (s *Server) sendTransferResponse(conn net.Conn, receivedBlob, isSdBlob bool
if isSdBlob {
response, err = json.Marshal(sdBlobTransferResponse{ReceivedSdBlob: receivedBlob})
} else {
response, err = json.Marshal(blobTransferResponse{ReceivedBlob: receivedBlob})
}
@ -270,6 +292,84 @@ func (s *Server) sendTransferResponse(conn net.Conn, receivedBlob, isSdBlob bool
return err
}
_, err = conn.Write(response)
return err
return s.write(conn, response)
}
func (s *Server) read(conn net.Conn, v interface{}) error {
err := conn.SetReadDeadline(time.Now().Add(s.timeout))
if err != nil {
return errors.Err(err)
}
return errors.Err(json.NewDecoder(conn).Decode(v))
}
func (s *Server) readRawBlob(conn net.Conn, blobSize int) ([]byte, error) {
err := conn.SetReadDeadline(time.Now().Add(s.timeout))
if err != nil {
return nil, errors.Err(err)
}
blob := make([]byte, blobSize)
_, err = io.ReadFull(bufio.NewReader(conn), blob)
return blob, errors.Err(err)
}
func (s *Server) write(conn net.Conn, b []byte) error {
err := conn.SetWriteDeadline(time.Now().Add(s.timeout))
if err != nil {
return errors.Err(err)
}
n, err := conn.Write(b)
if err == nil && n != len(b) {
err = io.ErrShortWrite
}
return errors.Err(err)
}
func (s *Server) quitting() bool {
select {
case <-s.grp.Ch():
return true
default:
return false
}
}
func getBlobHash(blob []byte) string {
hashBytes := sha512.Sum384(blob)
return hex.EncodeToString(hashBytes[:])
}
type errorResponse struct {
Error string `json:"error"`
}
type handshakeRequestResponse struct {
Version int `json:"version"`
}
type sendBlobRequest struct {
BlobHash string `json:"blob_hash,omitempty"`
BlobSize int `json:"blob_size,omitempty"`
SdBlobHash string `json:"sd_blob_hash,omitempty"`
SdBlobSize int `json:"sd_blob_size,omitempty"`
}
type sendBlobResponse struct {
SendBlob bool `json:"send_blob"`
}
type sendSdBlobResponse struct {
SendSdBlob bool `json:"send_sd_blob"`
NeededBlobs []string `json:"needed_blobs,omitempty"`
}
type blobTransferResponse struct {
ReceivedBlob bool `json:"received_blob"`
}
type sdBlobTransferResponse struct {
ReceivedSdBlob bool `json:"received_sd_blob"`
}

158
reflector/server_test.go Normal file
View file

@ -0,0 +1,158 @@
package reflector
import (
"crypto/rand"
"io"
"strconv"
"testing"
"time"
"github.com/davecgh/go-spew/spew"
"github.com/lbryio/reflector.go/store"
"github.com/phayes/freeport"
)
func startServerOnRandomPort(t *testing.T) (*Server, int) {
port, err := freeport.GetFreePort()
if err != nil {
t.Fatal(err)
}
srv := NewServer(&store.MemoryBlobStore{})
err = srv.Start("127.0.0.1:" + strconv.Itoa(port))
if err != nil {
t.Fatal(err)
}
return srv, port
}
func TestClient_NotConnected(t *testing.T) {
c := Client{}
err := c.SendBlob([]byte{})
if err == nil {
t.Error("client should error if it is not connected")
}
}
func TestClient_EmptyBlob(t *testing.T) {
srv, port := startServerOnRandomPort(t)
defer srv.Shutdown()
c := Client{}
err := c.Connect(":" + strconv.Itoa(port))
if err != nil {
t.Fatal("error connecting client to server", err)
}
err = c.SendBlob([]byte{})
if err == nil {
t.Error("client should not send empty blob")
}
}
func TestServer_MediumBlob(t *testing.T) {
srv, port := startServerOnRandomPort(t)
defer srv.Shutdown()
c := Client{}
err := c.Connect(":" + strconv.Itoa(port))
if err != nil {
t.Fatal("error connecting client to server", err)
}
blob := make([]byte, 1000)
_, err = rand.Read(blob)
if err != nil {
t.Fatal("failed to make random blob")
}
err = c.SendBlob(blob)
if err != nil {
t.Error(err)
}
}
func TestServer_FullBlob(t *testing.T) {
srv, port := startServerOnRandomPort(t)
defer srv.Shutdown()
c := Client{}
err := c.Connect(":" + strconv.Itoa(port))
if err != nil {
t.Fatal("error connecting client to server", err)
}
blob := make([]byte, maxBlobSize)
_, err = rand.Read(blob)
if err != nil {
t.Fatal("failed to make random blob")
}
err = c.SendBlob(blob)
if err != nil {
t.Error(err)
}
}
func TestServer_TooBigBlob(t *testing.T) {
srv, port := startServerOnRandomPort(t)
defer srv.Shutdown()
c := Client{}
err := c.Connect(":" + strconv.Itoa(port))
if err != nil {
t.Fatal("error connecting client to server", err)
}
blob := make([]byte, maxBlobSize+1)
_, err = rand.Read(blob)
if err != nil {
t.Fatal("failed to make random blob")
}
err = c.SendBlob(blob)
if err == nil {
t.Error("server should reject blob above max size")
}
}
func TestServer_Timeout(t *testing.T) {
t.Skip("server and client have no way to detect errors right now")
testTimeout := 50 * time.Millisecond
port, err := freeport.GetFreePort()
if err != nil {
t.Fatal(err)
}
srv := NewServer(&store.MemoryBlobStore{})
srv.timeout = testTimeout
err = srv.Start("127.0.0.1:" + strconv.Itoa(port))
if err != nil {
t.Fatal(err)
}
defer srv.Shutdown()
c := Client{}
err = c.Connect(":" + strconv.Itoa(port))
if err != nil {
t.Fatal("error connecting client to server", err)
}
time.Sleep(testTimeout * 2)
blob := make([]byte, 10)
_, err = rand.Read(blob)
if err != nil {
t.Fatal("failed to make random blob")
}
err = c.SendBlob(blob)
t.Log(spew.Sdump(err))
if err != io.EOF {
t.Error("server should have timed out by now")
}
}

58
reflector/shared.go
View file

@ -1,58 +0,0 @@
package reflector
import (
"crypto/sha512"
"encoding/hex"
"github.com/lbryio/lbry.go/errors"
)
const (
// DefaultPort is the port the reflector server listens on if not passed in.
DefaultPort = 5566
maxBlobSize = 2 * 1024 * 1024
protocolVersion1 = 0
protocolVersion2 = 1
)
// ErrBlobExists is a default error for when a blob already exists on the reflector server.
var ErrBlobExists = errors.Base("blob exists on server")
type errorResponse struct {
Error string `json:"error"`
}
type handshakeRequestResponse struct {
Version int `json:"version"`
}
type sendBlobRequest struct {
BlobHash string `json:"blob_hash,omitempty"`
BlobSize int `json:"blob_size,omitempty"`
SdBlobHash string `json:"sd_blob_hash,omitempty"`
SdBlobSize int `json:"sd_blob_size,omitempty"`
}
type sendBlobResponse struct {
SendBlob bool `json:"send_blob"`
}
type sendSdBlobResponse struct {
SendSdBlob bool `json:"send_sd_blob"`
NeededBlobs []string `json:"needed_blobs,omitempty"`
}
type blobTransferResponse struct {
ReceivedBlob bool `json:"received_blob"`
}
type sdBlobTransferResponse struct {
ReceivedSdBlob bool `json:"received_sd_blob"`
}
func getBlobHash(blob []byte) string {
hashBytes := sha512.Sum384(blob)
return hex.EncodeToString(hashBytes[:])
}