mirror of
https://github.com/ergochat/ergo.git
synced 2024-12-04 18:09:29 +01:00
46 lines
1.2 KiB
Go
46 lines
1.2 KiB
Go
// Copyright (c) 2022 Shivaram Lingamneni <slingamn@cs.stanford.edu>
|
|
// released under the MIT license
|
|
|
|
package datastore
|
|
|
|
import (
|
|
"time"
|
|
|
|
"github.com/ergochat/ergo/irc/utils"
|
|
)
|
|
|
|
type Table uint16
|
|
|
|
// XXX these are persisted and must remain stable;
|
|
// do not reorder, when deleting use _ to ensure that the deleted value is skipped
|
|
const (
|
|
TableMetadata Table = iota
|
|
TableChannels
|
|
TableChannelPurges
|
|
)
|
|
|
|
type KV struct {
|
|
UUID utils.UUID
|
|
Value []byte
|
|
}
|
|
|
|
// A Datastore provides the following abstraction:
|
|
// 1. Tables, each keyed on a UUID (the implementation is free to merge
|
|
// the table name and the UUID into a single key as long as the rest of
|
|
// the contract can be satisfied). Table names are [a-z0-9_]+
|
|
// 2. The ability to efficiently enumerate all uuid-value pairs in a table
|
|
// 3. Gets, sets, and deletes for individual (table, uuid) keys
|
|
type Datastore interface {
|
|
Backoff() time.Duration
|
|
|
|
GetAll(table Table) ([]KV, error)
|
|
|
|
// This is rarely used because it would typically lead to TOCTOU races
|
|
Get(table Table, key utils.UUID) (value []byte, err error)
|
|
|
|
Set(table Table, key utils.UUID, value []byte, expiration time.Time) error
|
|
|
|
// Note that deleting a nonexistent key is not considered an error
|
|
Delete(table Table, key utils.UUID) error
|
|
}
|