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feat: core grammar, discovery and renderer; Postgres dialect; conformance suite

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packages/postgres/package.json
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{
"name": "@crudy/restloom-postgres",
"version": "0.1.0",
"type": "module",
"description": "Postgres dialect for restloom",
"keywords": ["restloom", "postgres", "postgresql", "rest", "api"],
"author": "Marc Villain",
"homepage": "https://restloom.crudy.fr",
"repository": { "type": "git", "url": "git+https://github.com/crudylabs/restloom.git", "directory": "packages/postgres" },
"license": "Apache-2.0",
"exports": {
".": { "types": "./dist/index.d.ts", "default": "./dist/index.js" }
},
"files": ["dist", "LICENSE", "README.md"],
"engines": { "node": ">=20" },
"scripts": {
"build": "tsc -p .",
"prepack": "npm run build"
},
"dependencies": {
"@crudy/restloom": "^0.1.0"
},
"peerDependencies": {
"pg": "^8.11.0"
},
"devDependencies": {
"@types/node": "^24.0.0",
"@types/pg": "^8.11.0",
"pg": "^8.16.0",
"typescript": "^5.9.0"
}
}
packages/postgres/src/errors.ts
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import { RestError } from '@crudy/restloom';
const CODES: Record<string, [number, string]> = {
'42501': [403, 'forbidden'],
'23505': [409, 'duplicate'],
'23503': [409, 'reference_missing'],
'23502': [400, 'value_required'],
'23514': [400, 'value_rejected'],
'22P02': [400, 'invalid_value'],
'22007': [400, 'invalid_value'],
'22008': [400, 'invalid_value'],
'22003': [400, 'invalid_value'],
'22001': [400, 'invalid_value'],
'22023': [400, 'invalid_value'],
'57014': [503, 'timeout'],
};
/** A Postgres error the client caused, by SQLSTATE. The database's own message is never passed on. */
export function mapError(err: unknown): RestError | null {
const code = (err as { code?: unknown })?.code;
const hit = typeof code === 'string' ? CODES[code] : undefined;
return hit ? new RestError(hit[0], hit[1]) : null;
}
packages/postgres/src/index.ts
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import { SqlRenderer, type Dialect, type Tx } from '@crudy/restloom';
import type { Pool } from 'pg';
import { mapError } from './errors.js';
import { introspect } from './introspect.js';
export { mapError } from './errors.js';
/** Postgres writes every primitive the core's defaults assume; subclass it to change one. */
export class PostgresRenderer extends SqlRenderer {}
export interface PostgresOptions {
renderer?: SqlRenderer;
}
/**
* The Postgres dialect over a `pg` Pool. Every request runs in one transaction
* with a local statement timeout, read-only for reads, so a `transaction` hook
* can set the role and session settings that row security reads.
*/
export function postgres(pool: Pool, options: PostgresOptions = {}): Dialect {
return {
name: 'postgres',
capabilities: { returning: true, estimatedCount: true, rowSecurity: true },
renderer: options.renderer ?? new PostgresRenderer(),
introspect: (scope) => introspect(pool, scope),
async transaction(fn, { timeoutMs, readOnly }) {
const client = await pool.connect();
try {
await client.query(readOnly ? 'BEGIN READ ONLY' : 'BEGIN');
await client.query(`SET LOCAL statement_timeout = ${Math.max(1, Math.floor(timeoutMs))}`);
const tx: Tx = { query: async (sql, params) => (await client.query(sql, params)).rows };
const out = await fn(tx);
await client.query('COMMIT');
return out;
} catch (err) {
await client.query('ROLLBACK').catch(() => undefined);
throw err;
} finally {
client.release();
}
},
mapError,
async estimate(tx, sql, params) {
const [row] = await tx.query(`EXPLAIN (FORMAT JSON) ${sql}`, params);
const plan = (row?.['QUERY PLAN'] as { Plan?: { 'Plan Rows'?: number } }[] | undefined)?.[0]?.Plan;
return typeof plan?.['Plan Rows'] === 'number' ? plan['Plan Rows'] : null;
},
};
}
packages/postgres/src/introspect.ts
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import type { Catalog, CatalogColumn, CatalogTable } from '@crudy/restloom';
import type { Pool } from 'pg';
import { logical } from './types.js';
const TABLES = `
SELECT c.oid, n.nspname AS schema, c.relname AS name, c.relkind AS kind
FROM pg_class c JOIN pg_namespace n ON n.oid = c.relnamespace
WHERE c.relkind IN ('r', 'p', 'v', 'm', 'f')
AND (n.nspname = ANY($1::text[]) OR n.nspname || '.' || c.relname = ANY($2::text[]))`;
const COLUMNS = `
SELECT a.attrelid AS oid, a.attname AS name, format_type(a.atttypid, a.atttypmod) AS native,
b.typname, b.typtype, b.typcategory, a.attnotnull AS notnull,
(a.attgenerated <> '' OR a.attidentity = 'a') AS generated
FROM pg_attribute a
JOIN pg_type t ON t.oid = a.atttypid
JOIN pg_type b ON b.oid = CASE WHEN t.typtype = 'd' THEN t.typbasetype ELSE t.oid END
WHERE a.attrelid = ANY($1::oid[]) AND a.attnum > 0 AND NOT a.attisdropped
ORDER BY a.attrelid, a.attnum`;
const PRIMARY_KEYS = `
SELECT i.indrelid AS oid, array_agg(a.attname::text ORDER BY k.ord) AS columns
FROM pg_index i
CROSS JOIN LATERAL unnest(i.indkey) WITH ORDINALITY AS k(attnum, ord)
JOIN pg_attribute a ON a.attrelid = i.indrelid AND a.attnum = k.attnum
WHERE i.indisprimary AND i.indrelid = ANY($1::oid[])
GROUP BY i.indrelid`;
const FOREIGN_KEYS = `
SELECT con.conrelid AS oid, tn.nspname AS target_schema, tc.relname AS target_table,
(SELECT array_agg(a.attname::text ORDER BY k.ord) FROM unnest(con.conkey) WITH ORDINALITY k(n, ord)
JOIN pg_attribute a ON a.attrelid = con.conrelid AND a.attnum = k.n) AS columns,
(SELECT array_agg(a.attname::text ORDER BY k.ord) FROM unnest(con.confkey) WITH ORDINALITY k(n, ord)
JOIN pg_attribute a ON a.attrelid = con.confrelid AND a.attnum = k.n) AS target_columns
FROM pg_constraint con
JOIN pg_class tc ON tc.oid = con.confrelid
JOIN pg_namespace tn ON tn.oid = tc.relnamespace
WHERE con.contype = 'f' AND con.conrelid = ANY($1::oid[])
ORDER BY con.conname`;
const FUNCTIONS = `
SELECT n.nspname AS schema, p.proname AS name, p.proretset AS returns_set, p.pronargs AS nargs,
p.pronargdefaults AS ndefaults, coalesce(p.proargnames, '{}') AS argnames,
(SELECT array_agg(format_type(t, NULL) ORDER BY ord) FROM unnest(p.proargtypes) WITH ORDINALITY u(t, ord)) AS natives,
(SELECT array_agg(b.typname::text || ':' || b.typtype::text || ':' || b.typcategory::text ORDER BY ord)
FROM unnest(p.proargtypes) WITH ORDINALITY u(t, ord) JOIN pg_type b ON b.oid = u.t) AS types
FROM pg_proc p JOIN pg_namespace n ON n.oid = p.pronamespace
WHERE p.prokind = 'f' AND n.nspname = ANY($1::text[])`;
type Row = Record<string, unknown>;
/** Reads the tables, views, keys, foreign keys and functions of the exposed schemas and tables. */
export async function introspect(pool: Pool, scope: { schemas: string[]; tables: string[] }): Promise<Catalog> {
const { rows: tables } = await pool.query<Row>(TABLES, [scope.schemas, scope.tables]);
const oids = tables.map((t) => t.oid as number);
const [columns, keys, fks, fns] = await Promise.all([
pool.query<Row>(COLUMNS, [oids]), pool.query<Row>(PRIMARY_KEYS, [oids]),
pool.query<Row>(FOREIGN_KEYS, [oids]), pool.query<Row>(FUNCTIONS, [scope.schemas]),
]);
const byOid = new Map<number, CatalogTable>();
for (const t of tables) {
byOid.set(t.oid as number, {
schema: t.schema as string, name: t.name as string,
kind: t.kind === 'v' || t.kind === 'm' ? 'view' : 'table',
columns: [], primaryKey: [], foreignKeys: [],
});
}
for (const c of columns.rows) {
const col: CatalogColumn = {
name: c.name as string, nativeType: c.native as string, nullable: !c.notnull, generated: c.generated as boolean,
type: logical(c.typname as string, c.typtype as string, c.typcategory as string),
};
byOid.get(c.oid as number)?.columns.push(col);
}
for (const k of keys.rows) byOid.get(k.oid as number)!.primaryKey = k.columns as string[];
for (const f of fks.rows) {
byOid.get(f.oid as number)!.foreignKeys.push({
columns: f.columns as string[], targetColumns: f.target_columns as string[],
target: { schema: f.target_schema as string, table: f.target_table as string },
});
}
const functions = fns.rows.map((f) => {
const names = f.argnames as string[];
const types = (f.types as string[] | null) ?? [];
const natives = (f.natives as string[] | null) ?? [];
const nargs = f.nargs as number;
return {
schema: f.schema as string, name: f.name as string, returnsSet: f.returns_set as boolean,
args: types.map((t, i) => {
const [typname, typtype, category] = t.split(':');
return { name: names[i] ?? '', type: logical(typname, typtype, category), nativeType: natives[i], hasDefault: i >= nargs - (f.ndefaults as number) };
}),
};
});
return { tables: [...byOid.values()], functions };
}
packages/postgres/src/types.ts
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import type { LogicalType } from '@crudy/restloom';
const BY_NAME: Record<string, LogicalType> = {
int2: 'integer', int4: 'integer', int8: 'integer', oid: 'integer',
numeric: 'number', float4: 'number', float8: 'number', money: 'number',
bool: 'boolean', uuid: 'uuid',
date: 'date', timestamp: 'timestamp', timestamptz: 'timestamp', time: 'time', timetz: 'time',
text: 'text', varchar: 'text', bpchar: 'text', name: 'text', citext: 'text', inet: 'text', cidr: 'text',
json: 'json', jsonb: 'json', bytea: 'binary',
};
/** A Postgres type (after resolving a domain to its base) as a logical type. Enums read as text. */
export function logical(typname: string, typtype: string, category: string): LogicalType {
if (BY_NAME[typname]) return BY_NAME[typname];
if (typtype === 'e') return 'text';
if (category === 'A') return 'array';
return 'other';
}
packages/postgres/tsconfig.json
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{
"extends": "../../tsconfig.base.json",
"compilerOptions": { "outDir": "dist", "rootDir": "src" },
"include": ["src"]
}