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Refactor (De)SerializeSessionDescription as common utils

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This commit is contained in:
Arlo Breault 2020-03-17 15:18:25 -04:00
parent c11461d339
commit d10af300c1
6 changed files with 72 additions and 109 deletions
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7
client/lib/lib_test.go
View file

@ -9,6 +9,7 @@ import (
"sync"
"testing"
"git.torproject.org/pluggable-transports/snowflake.git/common/util"
"github.com/pion/webrtc/v2"
. "github.com/smartystreets/goconvey/convey"
)
@ -230,7 +231,7 @@ func TestSnowflakeClient(t *testing.T) {
So(err, ShouldBeNil)
c.offerChannel <- nil
answer := deserializeSessionDescription(sampleAnswer)
answer := util.DeserializeSessionDescription(sampleAnswer)
So(answer, ShouldNotBeNil)
c.answerChannel <- answer
err = c.exchangeSDP()
@ -255,7 +256,7 @@ func TestSnowflakeClient(t *testing.T) {
ctx.So(err, ShouldBeNil)
wg.Done()
}()
answer := deserializeSessionDescription(sampleAnswer)
answer := util.DeserializeSessionDescription(sampleAnswer)
c.answerChannel <- answer
wg.Wait()
})
@ -285,7 +286,7 @@ func TestSnowflakeClient(t *testing.T) {
http.StatusOK,
[]byte(`{"type":"answer","sdp":"fake"}`),
}
fakeOffer := deserializeSessionDescription(`{"type":"offer","sdp":"test"}`)
fakeOffer := util.DeserializeSessionDescription(`{"type":"offer","sdp":"test"}`)
Convey("Construct BrokerChannel with no front domain", func() {
b, err := NewBrokerChannel("test.broker", "", transport, false)

5
client/lib/rendezvous.go
View file

@ -18,6 +18,7 @@ import (
"net/http"
"net/url"
"git.torproject.org/pluggable-transports/snowflake.git/common/util"
"github.com/pion/sdp/v2"
"github.com/pion/webrtc/v2"
)
@ -140,7 +141,7 @@ func (bc *BrokerChannel) Negotiate(offer *webrtc.SessionDescription) (
SDP: stripLocalAddresses(offer.SDP),
}
}
data := bytes.NewReader([]byte(serializeSessionDescription(offer)))
data := bytes.NewReader([]byte(util.SerializeSessionDescription(offer)))
// Suffix with broker's client registration handler.
clientURL := bc.url.ResolveReference(&url.URL{Path: "client"})
request, err := http.NewRequest("POST", clientURL.String(), data)
@ -163,7 +164,7 @@ func (bc *BrokerChannel) Negotiate(offer *webrtc.SessionDescription) (
if nil != err {
return nil, err
}
answer := deserializeSessionDescription(string(body))
answer := util.DeserializeSessionDescription(string(body))
return answer, nil
case http.StatusServiceUnavailable:
return nil, errors.New(BrokerError503)

52
client/lib/util.go
View file

@ -1,11 +1,8 @@
package lib
import (
"encoding/json"
"log"
"time"
"github.com/pion/webrtc/v2"
)
const (
@ -86,52 +83,3 @@ func (b *BytesSyncLogger) AddInbound(amount int) {
}
b.InboundChan <- amount
}
func deserializeSessionDescription(msg string) *webrtc.SessionDescription {
var parsed map[string]interface{}
err := json.Unmarshal([]byte(msg), &parsed)
if nil != err {
log.Println(err)
return nil
}
if _, ok := parsed["type"]; !ok {
log.Println("Cannot deserialize SessionDescription without type field.")
return nil
}
if _, ok := parsed["sdp"]; !ok {
log.Println("Cannot deserialize SessionDescription without sdp field.")
return nil
}
var stype webrtc.SDPType
switch parsed["type"].(string) {
default:
log.Println("Unknown SDP type")
return nil
case "offer":
stype = webrtc.SDPTypeOffer
case "pranswer":
stype = webrtc.SDPTypePranswer
case "answer":
stype = webrtc.SDPTypeAnswer
case "rollback":
stype = webrtc.SDPTypeRollback
}
if err != nil {
log.Println(err)
return nil
}
return &webrtc.SessionDescription{
Type: stype,
SDP: parsed["sdp"].(string),
}
}
func serializeSessionDescription(desc *webrtc.SessionDescription) string {
bytes, err := json.Marshal(*desc)
if nil != err {
log.Println(err)
return ""
}
return string(bytes)
}

58
common/util/util.go Normal file
View file

@ -0,0 +1,58 @@
package util
import (
"encoding/json"
"log"
"github.com/pion/webrtc/v2"
)
func SerializeSessionDescription(desc *webrtc.SessionDescription) string {
bytes, err := json.Marshal(*desc)
if nil != err {
log.Println(err)
return ""
}
return string(bytes)
}
func DeserializeSessionDescription(msg string) *webrtc.SessionDescription {
var parsed map[string]interface{}
err := json.Unmarshal([]byte(msg), &parsed)
if nil != err {
log.Println(err)
return nil
}
if _, ok := parsed["type"]; !ok {
log.Println("Cannot deserialize SessionDescription without type field.")
return nil
}
if _, ok := parsed["sdp"]; !ok {
log.Println("Cannot deserialize SessionDescription without sdp field.")
return nil
}
var stype webrtc.SDPType
switch parsed["type"].(string) {
default:
log.Println("Unknown SDP type")
return nil
case "offer":
stype = webrtc.SDPTypeOffer
case "pranswer":
stype = webrtc.SDPTypePranswer
case "answer":
stype = webrtc.SDPTypeAnswer
case "rollback":
stype = webrtc.SDPTypeRollback
}
if err != nil {
log.Println(err)
return nil
}
return &webrtc.SessionDescription{
Type: stype,
SDP: parsed["sdp"].(string),
}
}

7
proxy-go/proxy-go_test.go
View file

@ -13,6 +13,7 @@ import (
"testing"
"git.torproject.org/pluggable-transports/snowflake.git/common/messages"
"git.torproject.org/pluggable-transports/snowflake.git/common/util"
"github.com/pion/webrtc/v2"
. "github.com/smartystreets/goconvey/convey"
)
@ -197,7 +198,7 @@ func TestSessionDescriptions(t *testing.T) {
},
},
} {
desc := deserializeSessionDescription(test.msg)
desc := util.DeserializeSessionDescription(test.msg)
So(desc, ShouldResemble, test.ret)
}
})
@ -214,7 +215,7 @@ func TestSessionDescriptions(t *testing.T) {
`{"type":"offer","sdp":"test"}`,
},
} {
msg := serializeSessionDescription(test.desc)
msg := util.SerializeSessionDescription(test.desc)
So(msg, ShouldResemble, test.ret)
}
})
@ -239,7 +240,7 @@ func TestBrokerInteractions(t *testing.T) {
},
}
pc, _ := webrtc.NewPeerConnection(config)
offer := deserializeSessionDescription(sampleOffer)
offer := util.DeserializeSessionDescription(sampleOffer)
pc.SetRemoteDescription(*offer)
answer, _ := pc.CreateAnswer(nil)
pc.SetLocalDescription(answer)

52
proxy-go/snowflake.go
View file

@ -4,7 +4,6 @@ import (
"bytes"
"crypto/rand"
"encoding/base64"
"encoding/json"
"flag"
"fmt"
"io"
@ -21,6 +20,7 @@ import (
"git.torproject.org/pluggable-transports/snowflake.git/common/messages"
"git.torproject.org/pluggable-transports/snowflake.git/common/safelog"
"git.torproject.org/pluggable-transports/snowflake.git/common/util"
"git.torproject.org/pluggable-transports/snowflake.git/common/websocketconn"
"github.com/gorilla/websocket"
"github.com/pion/webrtc/v2"
@ -199,7 +199,7 @@ func (b *Broker) pollOffer(sid string) *webrtc.SessionDescription {
return nil
}
if offer != "" {
return deserializeSessionDescription(offer)
return util.DeserializeSessionDescription(offer)
}
}
}
@ -209,7 +209,7 @@ func (b *Broker) pollOffer(sid string) *webrtc.SessionDescription {
func (b *Broker) sendAnswer(sid string, pc *webrtc.PeerConnection) error {
brokerPath := b.url.ResolveReference(&url.URL{Path: "answer"})
answer := string([]byte(serializeSessionDescription(pc.LocalDescription())))
answer := string([]byte(util.SerializeSessionDescription(pc.LocalDescription())))
body, err := messages.EncodeAnswerRequest(answer, sid)
if err != nil {
return err
@ -465,49 +465,3 @@ func main() {
runSession(sessionID)
}
}
func deserializeSessionDescription(msg string) *webrtc.SessionDescription {
var parsed map[string]interface{}
err := json.Unmarshal([]byte(msg), &parsed)
if nil != err {
log.Println(err)
return nil
}
if _, ok := parsed["type"]; !ok {
log.Println("Cannot deserialize SessionDescription without type field.")
return nil
}
if _, ok := parsed["sdp"]; !ok {
log.Println("Cannot deserialize SessionDescription without sdp field.")
return nil
}
var stype webrtc.SDPType
switch parsed["type"].(string) {
default:
log.Println("Unknown SDP type")
return nil
case "offer":
stype = webrtc.SDPTypeOffer
case "pranswer":
stype = webrtc.SDPTypePranswer
case "answer":
stype = webrtc.SDPTypeAnswer
case "rollback":
stype = webrtc.SDPTypeRollback
}
return &webrtc.SessionDescription{
Type: stype,
SDP: parsed["sdp"].(string),
}
}
func serializeSessionDescription(desc *webrtc.SessionDescription) string {
bytes, err := json.Marshal(*desc)
if nil != err {
log.Println(err)
return ""
}
return string(bytes)
}