mirror of https://github.com/harness/drone.git
80 lines
1.8 KiB
Go
80 lines
1.8 KiB
Go
// Copyright 2023 Harness, Inc.
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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 cache
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import (
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"bytes"
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"context"
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"encoding/gob"
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"github.com/harness/gitness/pubsub"
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"github.com/rs/zerolog/log"
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)
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type Evictor[T any] struct {
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nameSpace string
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topicName string
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bus pubsub.PubSub
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}
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func NewEvictor[T any](
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nameSpace string,
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topicName string,
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bus pubsub.PubSub,
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) Evictor[T] {
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return Evictor[T]{
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nameSpace: nameSpace,
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topicName: topicName,
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bus: bus,
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}
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}
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func (e Evictor[T]) Subscribe(ctx context.Context, fn func(key T) error) {
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if e.bus == nil {
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return
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}
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_ = e.bus.Subscribe(ctx, e.topicName, func(payload []byte) error {
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var key T
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err := gob.NewDecoder(bytes.NewReader(payload)).Decode(&key)
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if err != nil {
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log.Ctx(ctx).Warn().Err(err).Msgf("failed to process update event from type: %T", key)
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return err
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}
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return fn(key)
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}, pubsub.WithChannelNamespace(e.nameSpace))
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}
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func (e Evictor[T]) Evict(ctx context.Context, key T) {
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if e.bus == nil {
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return
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}
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buf := bytes.NewBuffer(nil)
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_ = gob.NewEncoder(buf).Encode(key)
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err := e.bus.Publish(
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ctx,
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e.topicName,
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buf.Bytes(),
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pubsub.WithPublishNamespace(e.nameSpace),
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)
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if err != nil {
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log.Ctx(ctx).Warn().Err(err).Msgf("failed to publish update event for type %T", key)
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}
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}
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