1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
import { randomUUID } from "node:crypto";
import {
explodeTurn,
explodeUserText,
groupRowsToMessages,
type MessageRow,
} from "../chunks/transform.js";
import type { ChunkData, ChunkRow, ChunkRowDraft, TextData } from "../types/index.js";
import { getDatabase } from "./index.js";
// Re-export the DB-free transforms so existing barrel consumers
// (`@dispatch/core`) keep importing them from here. The browser frontend deep-
// imports them directly from `chunks/transform.js` to avoid the DB dependency.
export { explodeTurn, explodeUserText, groupRowsToMessages, type MessageRow };
// ─── Persistence ─────────────────────────────────────────────────
function mapRow(row: Record<string, unknown>): ChunkRow {
let data: ChunkData;
try {
data = JSON.parse(row.data_json as string) as ChunkData;
} catch {
data = { text: "" } as TextData;
}
return {
id: row.id as string,
tabId: row.tab_id as string,
seq: row.seq as number,
turnId: row.turn_id as string,
step: row.step as number,
role: row.role as ChunkRow["role"],
type: row.type as ChunkRow["type"],
data,
createdAt: row.created_at as number,
};
}
/**
* Append one or more chunk-row drafts to a tab, assigning a monotonic per-tab
* `seq` and a fresh id/timestamp to each. Returns the inserted rows in order.
*/
export function appendChunks(tabId: string, drafts: ChunkRowDraft[]): ChunkRow[] {
if (drafts.length === 0) return [];
const db = getDatabase();
const maxSeq = db
.query("SELECT COALESCE(MAX(seq), -1) as max_seq FROM chunks WHERE tab_id = $tabId")
.get({ $tabId: tabId }) as { max_seq: number };
let seq = (maxSeq?.max_seq ?? -1) + 1;
const now = Date.now();
const insert = db.query(
`INSERT INTO chunks (id, tab_id, seq, turn_id, step, role, type, data_json, created_at)
VALUES ($id, $tabId, $seq, $turnId, $step, $role, $type, $dataJson, $now)`,
);
const out: ChunkRow[] = [];
// Wrap the whole batch in one transaction: a turn's chunks are persisted in
// a single `appendChunks` call, so this is one fsync per turn instead of one
// per row — the chosen low-IO write strategy for constrained backends.
const insertAll = db.transaction(() => {
for (const draft of drafts) {
const id = randomUUID();
insert.run({
$id: id,
$tabId: tabId,
$seq: seq,
$turnId: draft.turnId,
$step: draft.step,
$role: draft.role,
$type: draft.type,
$dataJson: JSON.stringify(draft.data),
$now: now,
});
out.push({
id,
tabId,
seq,
turnId: draft.turnId,
step: draft.step,
role: draft.role,
type: draft.type,
data: draft.data,
createdAt: now,
});
seq++;
}
});
insertAll();
return out;
}
/**
* Read chunk rows for a tab in `seq` order (ASC). Pagination mirrors the old
* message pagination but at chunk granularity:
* - no options → all rows;
* - `before` → rows with `seq < before`, most-recent-first then reversed;
* - `limit` → most recent `limit` rows, reversed to ASC.
*/
export function getChunksForTab(
tabId: string,
options?: { limit?: number; before?: number },
): ChunkRow[] {
const db = getDatabase();
if (!options) {
const rows = db
.query("SELECT * FROM chunks WHERE tab_id = $tabId ORDER BY seq ASC")
.all({ $tabId: tabId }) as Array<Record<string, unknown>>;
return rows.map(mapRow);
}
const { limit, before } = options;
if (before !== undefined) {
if (limit !== undefined) {
const rows = db
.query(
"SELECT * FROM chunks WHERE tab_id = $tabId AND seq < $before ORDER BY seq DESC LIMIT $limit",
)
.all({ $tabId: tabId, $before: before, $limit: limit }) as Array<Record<string, unknown>>;
return rows.map(mapRow).reverse();
}
const rows = db
.query("SELECT * FROM chunks WHERE tab_id = $tabId AND seq < $before ORDER BY seq DESC")
.all({ $tabId: tabId, $before: before }) as Array<Record<string, unknown>>;
return rows.map(mapRow).reverse();
}
if (limit !== undefined) {
const rows = db
.query("SELECT * FROM chunks WHERE tab_id = $tabId ORDER BY seq DESC LIMIT $limit")
.all({ $tabId: tabId, $limit: limit }) as Array<Record<string, unknown>>;
return rows.map(mapRow).reverse();
}
const rows = db
.query("SELECT * FROM chunks WHERE tab_id = $tabId ORDER BY seq ASC")
.all({ $tabId: tabId }) as Array<Record<string, unknown>>;
return rows.map(mapRow);
}
/**
* Derived, grouped view of a tab's full history as messages. Used to
* pre-populate the agent's in-memory `ChatMessage[]` history when an Agent is
* (re)constructed. Always reads the full log (grouping a partial window would
* be lossy for the rebuild path).
*/
export function getMessagesForTab(tabId: string): MessageRow[] {
return groupRowsToMessages(getChunksForTab(tabId));
}
export function getTotalChunkCount(tabId: string): number {
const db = getDatabase();
const row = db
.query("SELECT COUNT(*) as count FROM chunks WHERE tab_id = $tabId")
.get({ $tabId: tabId }) as { count: number } | null;
return row?.count ?? 0;
}
export function clearChunksForTab(tabId: string): void {
const db = getDatabase();
db.query("DELETE FROM chunks WHERE tab_id = $tabId").run({ $tabId: tabId });
}
|
