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78 lines
2.4 KiB
78 lines
2.4 KiB
package core
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import (
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ctypes "github.com/tendermint/tendermint/rpc/core/types"
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"github.com/tendermint/tendermint/rpc/lib/types"
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"github.com/tendermint/tendermint/types"
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)
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// Subscribe for events via WebSocket.
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//
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// ```go
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// import 'github.com/tendermint/tendermint/types'
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//
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// client := client.NewHTTP("tcp://0.0.0.0:46657", "/websocket")
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// result, err := client.AddListenerForEvent(types.EventStringNewBlock())
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// ```
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//
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// > The above command returns JSON structured like this:
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//
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// ```json
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// {
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// "error": "",
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// "result": {},
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// "id": "",
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// "jsonrpc": "2.0"
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// }
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// ```
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//
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// ### Query Parameters
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//
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// | Parameter | Type | Default | Required | Description |
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// |-----------+--------+---------+----------+-------------|
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// | event | string | "" | true | Event name |
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//
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// <aside class="notice">WebSocket only</aside>
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func Subscribe(wsCtx rpctypes.WSRPCContext, event string) (*ctypes.ResultSubscribe, error) {
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logger.Info("Subscribe to event", "remote", wsCtx.GetRemoteAddr(), "event", event)
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types.AddListenerForEvent(wsCtx.GetEventSwitch(), wsCtx.GetRemoteAddr(), event, func(msg types.TMEventData) {
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// NOTE: EventSwitch callbacks must be nonblocking
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// NOTE: RPCResponses of subscribed events have id suffix "#event"
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tmResult := &ctypes.ResultEvent{event, msg}
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wsCtx.TryWriteRPCResponse(rpctypes.NewRPCResponse(wsCtx.Request.ID+"#event", tmResult, ""))
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})
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return &ctypes.ResultSubscribe{}, nil
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}
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// Unsubscribe from events via WebSocket.
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//
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// ```go
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// import 'github.com/tendermint/tendermint/types'
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//
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// client := client.NewHTTP("tcp://0.0.0.0:46657", "/websocket")
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// result, err := client.RemoveListenerForEvent(types.EventStringNewBlock())
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// ```
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//
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// > The above command returns JSON structured like this:
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//
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// ```json
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// {
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// "error": "",
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// "result": {},
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// "id": "",
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// "jsonrpc": "2.0"
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// }
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// ```
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//
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// ### Query Parameters
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//
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// | Parameter | Type | Default | Required | Description |
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// |-----------+--------+---------+----------+-------------|
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// | event | string | "" | true | Event name |
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//
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// <aside class="notice">WebSocket only</aside>
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func Unsubscribe(wsCtx rpctypes.WSRPCContext, event string) (*ctypes.ResultUnsubscribe, error) {
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logger.Info("Unsubscribe to event", "remote", wsCtx.GetRemoteAddr(), "event", event)
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wsCtx.GetEventSwitch().RemoveListenerForEvent(event, wsCtx.GetRemoteAddr())
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return &ctypes.ResultUnsubscribe{}, nil
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}
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