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Websocket protocol binding (only client) #606

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131 changes: 131 additions & 0 deletions protocol/ws/v2/client_protocol.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,131 @@
package v2

import (
"context"
"errors"
"fmt"
"io"
"io/ioutil"
"sync"

"nhooyr.io/websocket"

"github.com/cloudevents/sdk-go/v2/binding"
"github.com/cloudevents/sdk-go/v2/binding/format"
"github.com/cloudevents/sdk-go/v2/binding/utils"
"github.com/cloudevents/sdk-go/v2/protocol"
)

// ClientProtocol implements protocol.Receiver, protocol.Sender and protocol.Closer.
// Note: when you use client.StartReceiver with this protocol, you can use just one
// goroutine to poll this protocol, because the protocol itself cannot handle multiple
// received messages at same time (WS has no multiplexing!)
type ClientProtocol struct {
conn *websocket.Conn

format format.Format
messageType websocket.MessageType

receiverLock sync.Mutex
connOwned bool // whether this protocol created the connection
}

// Dial wraps websocket.Dial and creates the ClientProtocol.
func Dial(ctx context.Context, u string, opts *websocket.DialOptions) (*ClientProtocol, error) {
if opts == nil {
opts = &websocket.DialOptions{}
}
opts.Subprotocols = SupportedSubprotocols
c, _, err := websocket.Dial(ctx, u, opts)
if err != nil {
return nil, err
}
p, err := NewClientProtocol(c)
if err != nil {
return nil, err
}
p.connOwned = true
return p, nil
}

// NewClientProtocol wraps a websocket.Conn in a type that implements protocol.Receiver, protocol.Sender and protocol.Closer.
// Look at ClientProtocol for more details.
func NewClientProtocol(c *websocket.Conn) (*ClientProtocol, error) {
f, messageType, err := resolveFormat(c.Subprotocol())
if err != nil {
return nil, err
}
return &ClientProtocol{
conn: c,
format: f,
messageType: messageType,
connOwned: false,
}, nil
}

func (c *ClientProtocol) Send(ctx context.Context, m binding.Message, transformers ...binding.Transformer) error {
writer, err := c.conn.Writer(ctx, c.messageType)
if err != nil {
return err
}
return utils.WriteStructured(ctx, m, writer, transformers...)
}

func (c *ClientProtocol) Receive(ctx context.Context) (binding.Message, error) {
c.receiverLock.Lock()
m, err := c.UnsafeReceive(ctx)
if m != nil {
m = binding.WithFinish(m, func(err error) {
c.receiverLock.Unlock()
})
} else {
c.receiverLock.Unlock()
}
return m, err
}

// UnsafeReceive is like Receive, except it doesn't guard from multiple invocations
// from different goroutines.
func (c *ClientProtocol) UnsafeReceive(ctx context.Context) (binding.Message, error) {
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might not export this, seems like a footgun

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@slinkydeveloper slinkydeveloper Nov 10, 2020

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It's not a footgun, on the contrary this is expected for a websocket user to be unable to invoke multiple times from different goroutines a method to read from the same connection, because she/he knows the wasm stream is not multiplexed. I wish to keep it pub for "power users" of websockets that doesn't want this (huge) lock in front

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If you feel this is really problematic, we can make it unexported and export it later

messageType, reader, err := c.conn.Reader(ctx)
if errors.Is(err, io.EOF) || errors.Is(err, websocket.CloseError{}) || (ctx.Err() != nil && errors.Is(err, ctx.Err())) {
return nil, io.EOF
}
if err != nil {
return nil, err
}

if messageType != c.messageType {
// We need to consume the stream, otherwise it won't be possible to consume the stream
consumeStream(reader)
return nil, fmt.Errorf("wrong message type: %s, expected %s", messageType, c.messageType)
}

return utils.NewStructuredMessage(c.format, reader), nil
}

func consumeStream(reader io.Reader) {
//TODO is there a less expensive way to consume the stream?
ioutil.ReadAll(reader)
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There might be some fancy seek thing we can do later... so we try to find the edge of a single event at a time

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We don't need to find the edge of the websocket message, this is already done by the lib itself. But yeah this is open to optimizations

}

func (c *ClientProtocol) Close(ctx context.Context) error {
if c.connOwned {
statusCode := websocket.StatusNormalClosure
if val := ctx.Value(codeKey{}); val != nil {
statusCode = val.(websocket.StatusCode)
}

reason := ""
if val := ctx.Value(reasonKey{}); val != nil {
reason = val.(string)
}

return c.conn.Close(statusCode, reason)
}
return nil
}

var _ protocol.Receiver = (*ClientProtocol)(nil)
var _ protocol.Sender = (*ClientProtocol)(nil)
var _ protocol.Closer = (*ClientProtocol)(nil)
101 changes: 101 additions & 0 deletions protocol/ws/v2/client_protocol_test.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,101 @@
package v2

import (
"context"
"encoding/json"
"net/http"
"net/http/httptest"
"sync/atomic"
"testing"

"github.com/stretchr/testify/require"
"nhooyr.io/websocket"

cloudevents "github.com/cloudevents/sdk-go/v2"
"github.com/cloudevents/sdk-go/v2/binding"
"github.com/cloudevents/sdk-go/v2/client"
. "github.com/cloudevents/sdk-go/v2/test"
)

func pingEvent() cloudevents.Event {
event := cloudevents.NewEvent()
event.SetID("1")
event.SetType("ping")
event.SetSource("localhost")
return event
}

func TestClientProtocolPingPong(t *testing.T) {
server := httptest.NewServer(pingPongHandler(t))
defer server.Close()

p, err := Dial(context.TODO(), server.URL, nil)
require.NoError(t, err)

ping := pingEvent()
require.NoError(t, p.Send(context.TODO(), binding.ToMessage(&ping)))

receivedMessage, err := p.Receive(context.TODO())
require.NoError(t, err)

pong, err := binding.ToEvent(context.TODO(), receivedMessage)
require.NoError(t, err)

AssertEvent(t, *pong, HasId("2"), HasType("pong"))

require.NoError(t, p.Close(context.TODO()))
}

func TestClientProtocolPingPongWithClient(t *testing.T) {
server := httptest.NewServer(pingPongHandler(t))
defer server.Close()

p, err := Dial(context.TODO(), server.URL, nil)
require.NoError(t, err)

c, err := cloudevents.NewClient(p, client.WithPollGoroutines(1))
require.NoError(t, err)

ping := pingEvent()
require.NoError(t, c.Send(context.TODO(), ping))

ctx, cancelFn := context.WithCancel(context.TODO())
var received atomic.Value
// Start receiver closes the connection when stopped!
err = c.StartReceiver(ctx, func(event cloudevents.Event) {
received.Store(event)
cancelFn()
})
require.NoError(t, err)

pong, ok := received.Load().(cloudevents.Event)
require.True(t, ok)

AssertEvent(t, pong, HasId("2"), HasType("pong"))
}

func pingPongHandler(t *testing.T) http.HandlerFunc {
return func(writer http.ResponseWriter, request *http.Request) {
c, err := websocket.Accept(writer, request, &websocket.AcceptOptions{Subprotocols: SupportedSubprotocols})

require.NoError(t, err)
require.Equal(t, JsonSubprotocol, c.Subprotocol())

messageType, b, err := c.Read(context.TODO())
require.NoError(t, err)
require.Equal(t, websocket.MessageText, messageType)

var ping cloudevents.Event
require.NoError(t, json.Unmarshal(b, &ping))
AssertEvent(t, ping, HasId("1"), HasType("ping"))

pong := ping.Clone()
pong.SetID("2")
pong.SetType("pong")

require.NoError(t, c.Write(context.TODO(), websocket.MessageText, MustJSON(t, pong)))

ctx := c.CloseRead(context.TODO())
<-ctx.Done()
}
}
15 changes: 15 additions & 0 deletions protocol/ws/v2/context.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
package v2

import (
"context"

"nhooyr.io/websocket"
)

type codeKey struct{}

type reasonKey struct{}

func WithCloseReason(ctx context.Context, code websocket.StatusCode, reason string) context.Context {
return context.WithValue(context.WithValue(ctx, codeKey{}, code), reasonKey{}, reason)
}
4 changes: 4 additions & 0 deletions protocol/ws/v2/doc.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
/*
Package ws implements the Websocket protocol binding
*/
package v2
11 changes: 11 additions & 0 deletions protocol/ws/v2/go.mod
Original file line number Diff line number Diff line change
@@ -0,0 +1,11 @@
module github.com/cloudevents/sdk-go/protocol/ws/v2

go 1.14

replace github.com/cloudevents/sdk-go/v2 => ../../../v2

require (
github.com/cloudevents/sdk-go/v2 v2.0.0
github.com/stretchr/testify v1.5.1
nhooyr.io/websocket v1.8.6
)
119 changes: 119 additions & 0 deletions protocol/ws/v2/go.sum
Original file line number Diff line number Diff line change
@@ -0,0 +1,119 @@
cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
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github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
github.com/google/go-cmp v0.4.0 h1:xsAVV57WRhGj6kEIi8ReJzQlHHqcBYCElAvkovg3B/4=
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github.com/lightstep/tracecontext.go v0.0.0-20181129014701-1757c391b1ac h1:+2b6iGRJe3hvV/yVXrd41yVEjxuFHxasJqDhkIjS4gk=
github.com/lightstep/tracecontext.go v0.0.0-20181129014701-1757c391b1ac/go.mod h1:Frd2bnT3w5FB5q49ENTfVlztJES+1k/7lyWX2+9gq/M=
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go.opencensus.io v0.22.0 h1:C9hSCOW830chIVkdja34wa6Ky+IzWllkUinR+BtRZd4=
go.opencensus.io v0.22.0/go.mod h1:+kGneAE2xo2IficOXnaByMWTGM9T73dGwxeWcUqIpI8=
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go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
go.uber.org/zap v1.10.0 h1:ORx85nbTijNz8ljznvCMR1ZBIPKFn3jQrag10X2AsuM=
go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
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golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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golang.org/x/net v0.0.0-20190501004415-9ce7a6920f09/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
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golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
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golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
nhooyr.io/websocket v1.8.6 h1:s+C3xAMLwGmlI31Nyn/eAehUlZPwfYZu2JXM621Q5/k=
nhooyr.io/websocket v1.8.6/go.mod h1:B70DZP8IakI65RVQ51MsWP/8jndNma26DVA/nFSCgW0=
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