Peter Stuifzand
3d4c4744fe
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74 lines
1.6 KiB
Go
74 lines
1.6 KiB
Go
// Package timeline contains different types of timeline backends.
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//
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// "sorted-set" uses Redis sorted sets as a backend
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// "stream" uses Redis 5 streams as a backend
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// "null" doesn't remember any items added to it
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package timeline
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import (
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"encoding/json"
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"p83.nl/go/ekster/pkg/microsub"
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"github.com/gomodule/redigo/redis"
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)
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// Backend specifies the interface for Timeline. It supports everything that is needed
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// for Ekster to implement the channel protocol for Microsub
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type Backend interface {
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Items(before, after string) (microsub.Timeline, error)
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Count() (int, error)
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AddItem(item microsub.Item) error
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MarkRead(uids []string) error
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// Not used at the moment
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// MarkUnread(uids []string) error
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}
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// Create creates a channel of the specfied type. Return nil when the type
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// is not known.
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func Create(channel, timelineType string, pool *redis.Pool) Backend {
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if timelineType == "sorted-set" {
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timeline := &redisSortedSetTimeline{channel: channel, pool: pool}
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err := timeline.Init()
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if err != nil {
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return nil
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}
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return timeline
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}
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if timelineType == "stream" {
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timeline := &redisStreamTimeline{channel: channel, pool: pool}
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err := timeline.Init()
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if err != nil {
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return nil
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}
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return timeline
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}
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if timelineType == "null" {
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timeline := &nullTimeline{channel: channel}
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err := timeline.Init()
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if err != nil {
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return nil
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}
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return timeline
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}
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return nil
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}
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type redisItem struct {
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ID string
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Published string
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Read bool
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Data []byte
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}
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func (ri *redisItem) Item() microsub.Item {
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var item microsub.Item
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_ = json.Unmarshal(ri.Data, &item)
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return item
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}
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