Merge pull request #39 from 178inaba/streaming_ws
WebSocket implementation of streaming API
This commit is contained in:
mattn
GitHub
commit
a8d8504d8f
178
streaming_ws.go
Normal file
178
streaming_ws.go
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package mastodon
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import (
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"context"
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"encoding/json"
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"net/url"
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"path"
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"github.com/gorilla/websocket"
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)
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// WSClient is a WebSocket client.
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type WSClient struct {
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websocket.Dialer
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client *Client
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}
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// NewWSClient return WebSocket client.
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func (c *Client) NewWSClient() *WSClient { return &WSClient{client: c} }
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// Stream is a struct of data that flows in streaming.
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type Stream struct {
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Event string `json:"event"`
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Payload interface{} `json:"payload"`
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}
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// StreamingWSPublic return channel to read events on public using WebSocket.
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func (c *WSClient) StreamingWSPublic(ctx context.Context) (chan Event, error) {
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return c.streamingWS(ctx, "public", "")
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}
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// StreamingWSPublicLocal return channel to read events on public local using WebSocket.
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func (c *WSClient) StreamingWSPublicLocal(ctx context.Context) (chan Event, error) {
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return c.streamingWS(ctx, "public:local", "")
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}
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// StreamingWSUser return channel to read events on home using WebSocket.
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func (c *WSClient) StreamingWSUser(ctx context.Context) (chan Event, error) {
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return c.streamingWS(ctx, "user", "")
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}
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// StreamingWSHashtag return channel to read events on tagged timeline using WebSocket.
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func (c *WSClient) StreamingWSHashtag(ctx context.Context, tag string) (chan Event, error) {
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return c.streamingWS(ctx, "hashtag", tag)
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}
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// StreamingWSHashtagLocal return channel to read events on tagged local timeline using WebSocket.
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func (c *WSClient) StreamingWSHashtagLocal(ctx context.Context, tag string) (chan Event, error) {
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return c.streamingWS(ctx, "hashtag:local", tag)
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}
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func (c *WSClient) streamingWS(ctx context.Context, stream, tag string) (chan Event, error) {
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params := url.Values{}
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params.Set("access_token", c.client.config.AccessToken)
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params.Set("stream", stream)
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if tag != "" {
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params.Set("tag", tag)
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}
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u, err := changeWebSocketScheme(c.client.config.Server)
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if err != nil {
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return nil, err
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}
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u.Path = path.Join(u.Path, "/api/v1/streaming")
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u.RawQuery = params.Encode()
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q := make(chan Event)
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go func() {
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for {
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err := c.handleWS(ctx, u.String(), q)
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if err != nil {
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return
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}
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}
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}()
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return q, nil
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}
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func (c *WSClient) handleWS(ctx context.Context, rawurl string, q chan Event) error {
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conn, err := c.dialRedirect(rawurl)
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if err != nil {
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q <- &ErrorEvent{err: err}
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// End.
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return err
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}
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defer conn.Close()
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for {
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select {
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case <-ctx.Done():
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q <- &ErrorEvent{err: ctx.Err()}
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// End.
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return ctx.Err()
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default:
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}
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var s Stream
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err := conn.ReadJSON(&s)
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if err != nil {
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q <- &ErrorEvent{err: err}
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// Reconnect.
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break
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}
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err = nil
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switch s.Event {
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case "update":
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var status Status
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err = json.Unmarshal([]byte(s.Payload.(string)), &status)
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if err == nil {
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q <- &UpdateEvent{Status: &status}
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}
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case "notification":
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var notification Notification
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err = json.Unmarshal([]byte(s.Payload.(string)), ¬ification)
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if err == nil {
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q <- &NotificationEvent{Notification: ¬ification}
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}
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case "delete":
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q <- &DeleteEvent{ID: int64(s.Payload.(float64))}
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}
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if err != nil {
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q <- &ErrorEvent{err}
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}
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}
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return nil
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}
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func (c *WSClient) dialRedirect(rawurl string) (conn *websocket.Conn, err error) {
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for {
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conn, rawurl, err = c.dial(rawurl)
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if err != nil {
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return nil, err
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} else if conn != nil {
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return conn, nil
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}
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}
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}
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func (c *WSClient) dial(rawurl string) (*websocket.Conn, string, error) {
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conn, resp, err := c.Dial(rawurl, nil)
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if err != nil && err != websocket.ErrBadHandshake {
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return nil, "", err
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}
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defer resp.Body.Close()
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if loc := resp.Header.Get("Location"); loc != "" {
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u, err := changeWebSocketScheme(loc)
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if err != nil {
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return nil, "", err
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}
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return nil, u.String(), nil
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}
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return conn, "", err
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}
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func changeWebSocketScheme(rawurl string) (*url.URL, error) {
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u, err := url.Parse(rawurl)
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if err != nil {
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return nil, err
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}
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switch u.Scheme {
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case "http":
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u.Scheme = "ws"
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case "https":
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u.Scheme = "wss"
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}
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return u, nil
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}
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298
streaming_ws_test.go
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298
streaming_ws_test.go
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@ -0,0 +1,298 @@
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package mastodon
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import (
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"context"
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"net/http"
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"net/http/httptest"
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"testing"
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"time"
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"github.com/gorilla/websocket"
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)
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func TestStreamingWSPublic(t *testing.T) {
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ts := httptest.NewServer(http.HandlerFunc(wsMock))
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defer ts.Close()
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client := NewClient(&Config{Server: ts.URL}).NewWSClient()
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ctx, cancel := context.WithCancel(context.Background())
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q, err := client.StreamingWSPublic(ctx)
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if err != nil {
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t.Fatalf("should not be fail: %v", err)
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}
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wsTest(t, q, cancel)
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}
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func TestStreamingWSPublicLocal(t *testing.T) {
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ts := httptest.NewServer(http.HandlerFunc(wsMock))
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defer ts.Close()
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client := NewClient(&Config{Server: ts.URL}).NewWSClient()
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ctx, cancel := context.WithCancel(context.Background())
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q, err := client.StreamingWSPublicLocal(ctx)
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if err != nil {
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t.Fatalf("should not be fail: %v", err)
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}
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wsTest(t, q, cancel)
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}
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func TestStreamingWSUser(t *testing.T) {
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ts := httptest.NewServer(http.HandlerFunc(wsMock))
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defer ts.Close()
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client := NewClient(&Config{Server: ts.URL}).NewWSClient()
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ctx, cancel := context.WithCancel(context.Background())
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q, err := client.StreamingWSUser(ctx)
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if err != nil {
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t.Fatalf("should not be fail: %v", err)
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}
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wsTest(t, q, cancel)
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}
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func TestStreamingWSHashtag(t *testing.T) {
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ts := httptest.NewServer(http.HandlerFunc(wsMock))
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defer ts.Close()
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client := NewClient(&Config{Server: ts.URL}).NewWSClient()
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ctx, cancel := context.WithCancel(context.Background())
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q, err := client.StreamingWSHashtag(ctx, "zzz")
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if err != nil {
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t.Fatalf("should not be fail: %v", err)
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}
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wsTest(t, q, cancel)
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}
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func TestStreamingWSHashtagLocal(t *testing.T) {
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ts := httptest.NewServer(http.HandlerFunc(wsMock))
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defer ts.Close()
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client := NewClient(&Config{Server: ts.URL}).NewWSClient()
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ctx, cancel := context.WithCancel(context.Background())
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q, err := client.StreamingWSHashtagLocal(ctx, "zzz")
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if err != nil {
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t.Fatalf("should not be fail: %v", err)
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}
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wsTest(t, q, cancel)
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}
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func wsMock(w http.ResponseWriter, r *http.Request) {
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if r.URL.Path != "/api/v1/streaming" {
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http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
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return
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}
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u := websocket.Upgrader{}
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conn, err := u.Upgrade(w, r, nil)
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if err != nil {
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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defer conn.Close()
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err = conn.WriteMessage(websocket.TextMessage,
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[]byte(`{"event":"update","payload":"{\"content\":\"foo\"}"}`))
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if err != nil {
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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err = conn.WriteMessage(websocket.TextMessage,
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[]byte(`{"event":"notification","payload":"{\"id\":123}"}`))
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if err != nil {
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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err = conn.WriteMessage(websocket.TextMessage,
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[]byte(`{"event":"delete","payload":1234567}`))
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if err != nil {
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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err = conn.WriteMessage(websocket.TextMessage,
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[]byte(`{"event":"update","payload":"<html></html>"}`))
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if err != nil {
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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time.Sleep(10 * time.Second)
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}
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func wsTest(t *testing.T, q chan Event, cancel func()) {
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time.AfterFunc(time.Second, func() {
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cancel()
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close(q)
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})
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events := []Event{}
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for e := range q {
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events = append(events, e)
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}
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if len(events) != 4 {
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t.Fatalf("result should be two: %d", len(events))
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}
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if events[0].(*UpdateEvent).Status.Content != "foo" {
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t.Fatalf("want %q but %q", "foo", events[0].(*UpdateEvent).Status.Content)
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}
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if events[1].(*NotificationEvent).Notification.ID != 123 {
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t.Fatalf("want %d but %d", 123, events[1].(*NotificationEvent).Notification.ID)
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}
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if events[2].(*DeleteEvent).ID != 1234567 {
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t.Fatalf("want %d but %d", 1234567, events[2].(*DeleteEvent).ID)
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}
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if errorEvent, ok := events[3].(*ErrorEvent); !ok {
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t.Fatalf("should be fail: %v", errorEvent.err)
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}
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}
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func TestStreamingWS(t *testing.T) {
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ts := httptest.NewServer(http.HandlerFunc(wsMock))
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defer ts.Close()
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client := NewClient(&Config{Server: ":"}).NewWSClient()
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_, err := client.StreamingWSPublicLocal(context.Background())
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if err == nil {
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t.Fatalf("should be fail: %v", err)
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}
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client = NewClient(&Config{Server: ts.URL}).NewWSClient()
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ctx, cancel := context.WithCancel(context.Background())
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cancel()
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q, err := client.StreamingWSPublicLocal(ctx)
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if err != nil {
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t.Fatalf("should not be fail: %v", err)
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}
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go func() {
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e := <-q
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if errorEvent, ok := e.(*ErrorEvent); !ok {
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t.Fatalf("should be fail: %v", errorEvent.err)
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}
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}()
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}
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func TestHandleWS(t *testing.T) {
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ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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u := websocket.Upgrader{}
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conn, err := u.Upgrade(w, r, nil)
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if err != nil {
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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defer conn.Close()
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err = conn.WriteMessage(websocket.TextMessage,
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[]byte(`<html></html>`))
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if err != nil {
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http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
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return
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}
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time.Sleep(10 * time.Second)
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}))
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defer ts.Close()
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q := make(chan Event)
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client := NewClient(&Config{}).NewWSClient()
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go func() {
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e := <-q
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if errorEvent, ok := e.(*ErrorEvent); !ok {
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t.Fatalf("should be fail: %v", errorEvent.err)
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}
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}()
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err := client.handleWS(context.Background(), ":", q)
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if err == nil {
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t.Fatalf("should be fail: %v", err)
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}
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ctx, cancel := context.WithCancel(context.Background())
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cancel()
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go func() {
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e := <-q
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if errorEvent, ok := e.(*ErrorEvent); !ok {
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t.Fatalf("should be fail: %v", errorEvent.err)
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}
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}()
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err = client.handleWS(ctx, "ws://"+ts.Listener.Addr().String(), q)
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if err == nil {
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t.Fatalf("should be fail: %v", err)
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}
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go func() {
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e := <-q
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if errorEvent, ok := e.(*ErrorEvent); !ok {
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t.Fatalf("should be fail: %v", errorEvent.err)
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}
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}()
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client.handleWS(context.Background(), "ws://"+ts.Listener.Addr().String(), q)
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}
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func TestDialRedirect(t *testing.T) {
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client := NewClient(&Config{}).NewWSClient()
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_, err := client.dialRedirect(":")
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if err == nil {
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t.Fatalf("should be fail: %v", err)
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}
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}
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func TestDial(t *testing.T) {
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canErr := true
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ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if canErr {
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canErr = false
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http.Redirect(w, r, ":", http.StatusMovedPermanently)
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return
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}
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http.Redirect(w, r, "http://www.example.com/", http.StatusMovedPermanently)
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}))
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defer ts.Close()
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client := NewClient(&Config{}).NewWSClient()
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_, _, err := client.dial(":")
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if err == nil {
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t.Fatalf("should be fail: %v", err)
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}
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_, rawurl, err := client.dial("ws://" + ts.Listener.Addr().String())
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if err == nil {
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t.Fatalf("should be fail: %v", err)
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}
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_, rawurl, err = client.dial("ws://" + ts.Listener.Addr().String())
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if err != nil {
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t.Fatalf("should not be fail: %v", err)
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}
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if rawurl != "ws://www.example.com/" {
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t.Fatalf("want %q but %q", "ws://www.example.com/", rawurl)
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}
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}
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func TestChangeWebSocketScheme(t *testing.T) {
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_, err := changeWebSocketScheme(":")
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if err == nil {
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t.Fatalf("should be fail: %v", err)
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}
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u, err := changeWebSocketScheme("http://example.com/")
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if err != nil {
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t.Fatalf("should not be fail: %v", err)
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}
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if u.Scheme != "ws" {
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t.Fatalf("want %q but %q", "ws", u.Scheme)
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}
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u, err = changeWebSocketScheme("https://example.com/")
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if err != nil {
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t.Fatalf("should not be fail: %v", err)
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}
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if u.Scheme != "wss" {
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t.Fatalf("want %q but %q", "wss", u.Scheme)
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}
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}
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