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feat: support websocket sink (#2985)
Signed-off-by: Song Gao <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| // Copyright 2024 EMQ Technologies Co., Ltd. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package websocket | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "strings" | ||
|
|
||
| "github.com/lf-edge/ekuiper/contract/v2/api" | ||
| "github.com/lf-edge/ekuiper/v2/internal/io/http/httpserver" | ||
| "github.com/lf-edge/ekuiper/v2/internal/io/memory/pubsub" | ||
| "github.com/lf-edge/ekuiper/v2/pkg/cast" | ||
| "github.com/lf-edge/ekuiper/v2/pkg/connection" | ||
| ) | ||
|
|
||
| type WebsocketSink struct { | ||
| cfg *WebsocketConfig | ||
| props map[string]any | ||
| topic string | ||
| } | ||
|
|
||
| func (w *WebsocketSink) Provision(ctx api.StreamContext, configs map[string]any) error { | ||
| cfg := &WebsocketConfig{} | ||
| if err := cast.MapToStruct(configs, cfg); err != nil { | ||
| return err | ||
| } | ||
| if !strings.HasPrefix(cfg.Endpoint, "/") { | ||
| return fmt.Errorf("websocket endpoint should start with /") | ||
| } | ||
| w.cfg = cfg | ||
| w.props = configs | ||
| return nil | ||
| } | ||
|
|
||
| func (w *WebsocketSink) Close(ctx api.StreamContext) error { | ||
| pubsub.RemovePub(w.topic) | ||
| return connection.DetachConnection(ctx, buildWebsocketEpID(w.cfg.Endpoint), w.props) | ||
| } | ||
|
|
||
| func (w *WebsocketSink) Connect(ctx api.StreamContext) error { | ||
| conn, err := connection.FetchConnection(ctx, buildWebsocketEpID(w.cfg.Endpoint), "websocket", w.props) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| c, ok := conn.(*httpserver.WebsocketConnection) | ||
| if !ok { | ||
| return fmt.Errorf("should use websocket connection") | ||
| } | ||
| w.topic = c.SendTopic | ||
| pubsub.CreatePub(w.topic) | ||
| return nil | ||
| } | ||
|
|
||
| func (w *WebsocketSink) Collect(ctx api.StreamContext, item api.RawTuple) error { | ||
| return w.collect(ctx, item.Raw()) | ||
| } | ||
|
|
||
| func (w *WebsocketSink) collect(ctx api.StreamContext, data []byte) error { | ||
| pubsub.ProduceAny(ctx, w.topic, data) | ||
| return nil | ||
| } | ||
|
|
||
| func GetSink() api.Sink { | ||
| return &WebsocketSink{} | ||
| } | ||
|
|
||
| var _ api.BytesCollector = &WebsocketSink{} | ||
|
|
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| func buildWebsocketEpID(endpoint string) string { | ||
| return fmt.Sprintf("$$ws/%s", endpoint) | ||
| } |
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