77 lines
2.2 KiB
Go
77 lines
2.2 KiB
Go
// Copyright 2020 The Matrix.org Foundation C.I.C.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package hooks exposes places in Dendrite where custom code can be executed, useful for MSCs.
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// Hooks can only be run in monolith mode.
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package hooks
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import (
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"sync"
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)
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const (
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// KindNewEventPersisted is a hook which is called with *types.HeaderedEvent
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// It is run when a new event is persisted in the roomserver.
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// Usage:
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// hooks.Attach(hooks.KindNewEventPersisted, func(headeredEvent interface{}) { ... })
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KindNewEventPersisted = "new_event_persisted"
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// KindNewEventReceived is a hook which is called with *types.HeaderedEvent
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// It is run before a new event is processed by the roomserver. This hook can be used
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// to modify the event before it is persisted by adding data to `unsigned`.
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// Usage:
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// hooks.Attach(hooks.KindNewEventReceived, func(headeredEvent interface{}) {
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// ev := headeredEvent.(*types.HeaderedEvent)
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// _ = ev.SetUnsignedField("key", "val")
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// })
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KindNewEventReceived = "new_event_received"
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)
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var (
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hookMap = make(map[string][]func(interface{}))
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hookMu = sync.Mutex{}
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enabled = false
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)
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// Enable all hooks. This may slow down the server slightly. Required for MSCs to work.
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func Enable() {
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enabled = true
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}
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// Run any hooks
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func Run(kind string, data interface{}) {
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if !enabled {
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return
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}
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cbs := callbacks(kind)
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for _, cb := range cbs {
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cb(data)
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}
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}
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// Attach a hook
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func Attach(kind string, callback func(interface{})) {
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if !enabled {
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return
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}
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hookMu.Lock()
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defer hookMu.Unlock()
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hookMap[kind] = append(hookMap[kind], callback)
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}
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func callbacks(kind string) []func(interface{}) {
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hookMu.Lock()
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defer hookMu.Unlock()
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return hookMap[kind]
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}
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