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