180 lines
4.5 KiB
TypeScript
180 lines
4.5 KiB
TypeScript
import { SQLite } from "../../server/deps.ts";
|
|
import { SysCallMapping } from "../system.ts";
|
|
|
|
export type Item = {
|
|
page: string;
|
|
key: string;
|
|
value: any;
|
|
};
|
|
|
|
export type KV = {
|
|
key: string;
|
|
value: any;
|
|
};
|
|
|
|
export function ensureTable(db: SQLite, tableName: string) {
|
|
const stmt = db.prepare(
|
|
`SELECT name FROM sqlite_master WHERE type='table' AND name=?`,
|
|
);
|
|
const result = stmt.all(tableName);
|
|
if (result.length === 0) {
|
|
db.exec(`CREATE TABLE ${tableName} (key STRING PRIMARY KEY, value TEXT);`);
|
|
console.log(`Created table ${tableName}`);
|
|
}
|
|
return Promise.resolve();
|
|
}
|
|
|
|
export type Query = {
|
|
filter?: Filter[];
|
|
orderBy?: string;
|
|
orderDesc?: boolean;
|
|
limit?: number;
|
|
select?: string[];
|
|
};
|
|
|
|
export type Filter = {
|
|
op: string;
|
|
prop: string;
|
|
value: any;
|
|
};
|
|
|
|
export function queryToSql(
|
|
query: Query,
|
|
): { sql: string; params: any[] } {
|
|
const whereClauses: string[] = [];
|
|
const clauses: string[] = [];
|
|
const params: any[] = [];
|
|
if (query.filter) {
|
|
for (const filter of query.filter) {
|
|
whereClauses.push(
|
|
`json_extract(value, '$.${filter.prop}') ${filter.op} ?`,
|
|
);
|
|
params.push(filter.value);
|
|
}
|
|
}
|
|
if (query.orderBy) {
|
|
clauses.push(
|
|
`ORDER BY json_extract(value, '$.${query.orderBy}') ${
|
|
query.orderDesc ? "desc" : "asc"
|
|
}`,
|
|
);
|
|
}
|
|
if (query.limit) {
|
|
clauses.push(`LIMIT ${query.limit}`);
|
|
}
|
|
return {
|
|
sql: whereClauses.length > 0
|
|
? `WHERE ${whereClauses.join(" AND ")} ${clauses.join(" ")}`
|
|
: clauses.join(" "),
|
|
params,
|
|
};
|
|
}
|
|
|
|
export function asyncQuery<T extends Record<string, unknown>>(
|
|
db: SQLite,
|
|
query: string,
|
|
...params: any[]
|
|
): Promise<T[]> {
|
|
// console.log("Querying", query, params);
|
|
return Promise.resolve(db.prepare(query).all<T>(params));
|
|
}
|
|
|
|
export function asyncExecute(
|
|
db: SQLite,
|
|
query: string,
|
|
...params: any[]
|
|
): Promise<number> {
|
|
// console.log("Exdecting", query, params);
|
|
return Promise.resolve(db.exec(query, params));
|
|
}
|
|
|
|
export function storeSyscalls(
|
|
db: SQLite,
|
|
tableName: string,
|
|
): SysCallMapping {
|
|
const apiObj: SysCallMapping = {
|
|
"store.delete": async (_ctx, key: string) => {
|
|
await asyncExecute(db, `DELETE FROM ${tableName} WHERE key = ?`, key);
|
|
},
|
|
"store.deletePrefix": async (_ctx, prefix: string) => {
|
|
await asyncExecute(
|
|
db,
|
|
`DELETE FROM ${tableName} WHERE key LIKE ?`,
|
|
`${prefix}%`,
|
|
);
|
|
},
|
|
"store.deleteQuery": async (_ctx, query: Query) => {
|
|
const { sql, params } = queryToSql(query);
|
|
await asyncExecute(db, `DELETE FROM ${tableName} ${sql}`, ...params);
|
|
},
|
|
"store.deleteAll": async () => {
|
|
await asyncExecute(db, `DELETE FROM ${tableName}`);
|
|
},
|
|
"store.set": async (_ctx, key: string, value: any) => {
|
|
await asyncExecute(
|
|
db,
|
|
`UPDATE ${tableName} SET value = ? WHERE key = ?`,
|
|
JSON.stringify(value),
|
|
key,
|
|
);
|
|
if (db.changes === 0) {
|
|
await asyncExecute(
|
|
db,
|
|
`INSERT INTO ${tableName} (key, value) VALUES (?, ?)`,
|
|
key,
|
|
JSON.stringify(value),
|
|
);
|
|
}
|
|
},
|
|
// TODO: Optimize
|
|
"store.batchSet": async (ctx, kvs: KV[]) => {
|
|
for (const { key, value } of kvs) {
|
|
await apiObj["store.set"](ctx, key, value);
|
|
}
|
|
},
|
|
"store.batchDelete": async (ctx, keys: string[]) => {
|
|
for (const key of keys) {
|
|
await apiObj["store.delete"](ctx, key);
|
|
}
|
|
},
|
|
"store.get": async (_ctx, key: string): Promise<any | null> => {
|
|
const result = await asyncQuery<Item>(
|
|
db,
|
|
`SELECT value FROM ${tableName} WHERE key = ?`,
|
|
key,
|
|
);
|
|
if (result.length) {
|
|
return JSON.parse(result[0].value);
|
|
} else {
|
|
return null;
|
|
}
|
|
},
|
|
"store.queryPrefix": async (_ctx, prefix: string) => {
|
|
return (
|
|
await asyncQuery<Item>(
|
|
db,
|
|
`SELECT key, value FROM ${tableName} WHERE key LIKE ?`,
|
|
`${prefix}%`,
|
|
)
|
|
).map(({ key, value }) => ({
|
|
key,
|
|
value: JSON.parse(value),
|
|
}));
|
|
},
|
|
"store.query": async (_ctx, query: Query) => {
|
|
const { sql, params } = queryToSql(query);
|
|
return (
|
|
await asyncQuery<Item>(
|
|
db,
|
|
`SELECT key, value FROM ${tableName} ${sql}`,
|
|
...params,
|
|
)
|
|
).map(({ key, value }: { key: string; value: string }) => ({
|
|
key,
|
|
value: JSON.parse(value),
|
|
}));
|
|
},
|
|
};
|
|
return apiObj;
|
|
}
|