112 lines
3 KiB
Go
112 lines
3 KiB
Go
// Vikunja is a to-do list application to facilitate your life.
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// Copyright 2018-2021 Vikunja and contributors. All rights reserved.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public Licensee as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public Licensee for more details.
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//
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// You should have received a copy of the GNU Affero General Public Licensee
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package events
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import (
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"context"
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"encoding/json"
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"time"
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"code.vikunja.io/api/pkg/log"
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vmetrics "code.vikunja.io/api/pkg/metrics"
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"github.com/ThreeDotsLabs/watermill"
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"github.com/ThreeDotsLabs/watermill/components/metrics"
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"github.com/ThreeDotsLabs/watermill/message"
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"github.com/ThreeDotsLabs/watermill/message/router/middleware"
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"github.com/ThreeDotsLabs/watermill/pubsub/gochannel"
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)
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var pubsub *gochannel.GoChannel
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// Event represents the event interface used by all events
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type Event interface {
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Name() string
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}
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// InitEvents sets up everything needed to work with events
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func InitEvents() (err error) {
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logger := log.NewWatermillLogger()
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router, err := message.NewRouter(
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message.RouterConfig{},
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logger,
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)
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if err != nil {
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return err
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}
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metricsBuilder := metrics.NewPrometheusMetricsBuilder(vmetrics.GetRegistry(), "", "")
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metricsBuilder.AddPrometheusRouterMetrics(router)
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pubsub = gochannel.NewGoChannel(
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gochannel.Config{
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OutputChannelBuffer: 1024,
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},
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logger,
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)
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poison, err := middleware.PoisonQueue(pubsub, "poison")
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if err != nil {
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return err
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}
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router.AddNoPublisherHandler("poison.logger", "poison", pubsub, func(msg *message.Message) error {
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meta := ""
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for s, m := range msg.Metadata {
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meta += s + "=" + m + ", "
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}
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log.Errorf("Error while handling message %s, %s payload=%s", msg.UUID, meta, string(msg.Payload))
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return nil
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})
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router.AddMiddleware(
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poison,
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middleware.Retry{
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MaxRetries: 5,
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InitialInterval: time.Millisecond * 100,
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MaxInterval: time.Hour,
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Multiplier: 2,
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MaxElapsedTime: 0,
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RandomizationFactor: 1,
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Logger: logger,
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}.Middleware,
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middleware.Recoverer,
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)
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for topic, funcs := range listeners {
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for _, handler := range funcs {
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router.AddNoPublisherHandler(topic+"."+handler.Name(), topic, pubsub, handler.Handle)
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}
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}
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return router.Run(context.Background())
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}
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// Dispatch dispatches an event
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func Dispatch(event Event) error {
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if isUnderTest {
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dispatchedTestEvents = append(dispatchedTestEvents, event)
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return nil
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}
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content, err := json.Marshal(event)
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if err != nil {
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return err
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}
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msg := message.NewMessage(watermill.NewUUID(), content)
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return pubsub.Publish(event.Name(), msg)
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}
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