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silverbullet/plugos/syscalls/store.deno.ts
2022-10-14 16:49:45 +02:00

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;
}