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96 KiB
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{"version":3,"sources":["../../src/live/index.ts","../../../pg-protocol/src/string-utils.ts","../../../pg-protocol/src/buffer-writer.ts","../../../pg-protocol/src/serializer.ts","../../../pg-protocol/src/buffer-reader.ts","../../../pg-protocol/src/parser.ts","../../src/types.ts","../../src/parse.ts","../../src/utils.ts"],"sourcesContent":["import type {\n Extension,\n PGliteInterface,\n Results,\n Transaction,\n} from '../interface'\nimport type {\n LiveQueryOptions,\n LiveIncrementalQueryOptions,\n LiveChangesOptions,\n LiveNamespace,\n LiveQuery,\n LiveChanges,\n Change,\n LiveQueryResults,\n} from './interface'\nimport { uuid, formatQuery, debounceMutex } from '../utils.js'\n\nexport type {\n LiveNamespace,\n LiveQuery,\n LiveChanges,\n Change,\n LiveQueryResults,\n} from './interface.js'\n\nconst MAX_RETRIES = 5\n\nconst setup = async (pg: PGliteInterface, _emscriptenOpts: any) => {\n // The notify triggers are only ever added and never removed\n // Keep track of which triggers have been added to avoid adding them multiple times\n const tableNotifyTriggersAdded = new Set<string>()\n\n const namespaceObj: LiveNamespace = {\n async query<T>(\n query: string | LiveQueryOptions<T>,\n params?: any[] | null,\n callback?: (results: Results<T>) => void,\n ) {\n let signal: AbortSignal | undefined\n let offset: number | undefined\n let limit: number | undefined\n if (typeof query !== 'string') {\n signal = query.signal\n params = query.params\n callback = query.callback\n offset = query.offset\n limit = query.limit\n query = query.query\n }\n\n // Offset and limit must be provided together\n if ((offset === undefined) !== (limit === undefined)) {\n throw new Error('offset and limit must be provided together')\n }\n\n const isWindowed = offset !== undefined && limit !== undefined\n let totalCount: number | undefined = undefined\n\n if (\n isWindowed &&\n (typeof offset !== 'number' ||\n isNaN(offset) ||\n typeof limit !== 'number' ||\n isNaN(limit))\n ) {\n throw new Error('offset and limit must be numbers')\n }\n\n let callbacks: Array<(results: Results<T>) => void> = callback\n ? [callback]\n : []\n const id = uuid().replace(/-/g, '')\n let dead = false\n\n let results: LiveQueryResults<T>\n\n let unsubList: Array<(tx?: Transaction) => Promise<void>>\n const init = async () => {\n await pg.transaction(async (tx) => {\n // Create a temporary view with the query\n const formattedQuery =\n params && params.length > 0\n ? await formatQuery(pg, query, params, tx)\n : query\n await tx.exec(\n `CREATE OR REPLACE TEMP VIEW live_query_${id}_view AS ${formattedQuery}`,\n )\n\n // Get the tables used in the view and add triggers to notify when they change\n const tables = await getTablesForView(tx, `live_query_${id}_view`)\n await addNotifyTriggersToTables(tx, tables, tableNotifyTriggersAdded)\n\n if (isWindowed) {\n await tx.exec(`\n PREPARE live_query_${id}_get(int, int) AS\n SELECT * FROM live_query_${id}_view\n LIMIT $1 OFFSET $2;\n `)\n await tx.exec(`\n PREPARE live_query_${id}_get_total_count AS\n SELECT COUNT(*) FROM live_query_${id}_view;\n `)\n totalCount = (\n await tx.query<{ count: number }>(\n `EXECUTE live_query_${id}_get_total_count;`,\n )\n ).rows[0].count\n results = {\n ...(await tx.query<T>(\n `EXECUTE live_query_${id}_get(${limit}, ${offset});`,\n )),\n offset,\n limit,\n totalCount,\n }\n } else {\n await tx.exec(`\n PREPARE live_query_${id}_get AS\n SELECT * FROM live_query_${id}_view;\n `)\n results = await tx.query<T>(`EXECUTE live_query_${id}_get;`)\n }\n // Setup the listeners\n unsubList = await Promise.all(\n tables!.map((table) =>\n tx.listen(\n `\"table_change__${table.schema_oid}__${table.table_oid}\"`,\n async () => {\n refresh()\n },\n ),\n ),\n )\n })\n }\n await init()\n\n // Function to refresh the query\n const refresh = debounceMutex(\n async ({\n offset: newOffset,\n limit: newLimit,\n }: {\n offset?: number\n limit?: number\n } = {}) => {\n // We can optionally provide new offset and limit values to refresh with\n if (\n !isWindowed &&\n (newOffset !== undefined || newLimit !== undefined)\n ) {\n throw new Error(\n 'offset and limit cannot be provided for non-windowed queries',\n )\n }\n if (\n (newOffset &&\n (typeof newOffset !== 'number' || isNaN(newOffset))) ||\n (newLimit && (typeof newLimit !== 'number' || isNaN(newLimit)))\n ) {\n throw new Error('offset and limit must be numbers')\n }\n offset = newOffset ?? offset\n limit = newLimit ?? limit\n\n const run = async (count = 0) => {\n if (callbacks.length === 0) {\n return\n }\n try {\n if (isWindowed) {\n // For a windowed query we defer the refresh of the total count until\n // after we have returned the results with the old total count. This\n // is due to a count(*) being a fairly slow query and we want to update\n // the rows on screen as quickly as possible.\n results = {\n ...(await pg.query<T>(\n `EXECUTE live_query_${id}_get(${limit}, ${offset});`,\n )),\n offset,\n limit,\n totalCount, // This is the old total count\n }\n } else {\n results = await pg.query<T>(`EXECUTE live_query_${id}_get;`)\n }\n } catch (e) {\n const msg = (e as Error).message\n if (\n msg.startsWith(`prepared statement \"live_query_${id}`) &&\n msg.endsWith('does not exist')\n ) {\n // If the prepared statement does not exist, reset and try again\n // This can happen if using the multi-tab worker\n if (count > MAX_RETRIES) {\n throw e\n }\n await init()\n run(count + 1)\n } else {\n throw e\n }\n }\n\n runResultCallbacks(callbacks, results)\n\n // Update the total count\n // If the total count has changed, refresh the query\n if (isWindowed) {\n const newTotalCount = (\n await pg.query<{ count: number }>(\n `EXECUTE live_query_${id}_get_total_count;`,\n )\n ).rows[0].count\n if (newTotalCount !== totalCount) {\n // The total count has changed, refresh the query\n totalCount = newTotalCount\n refresh()\n }\n }\n }\n await run()\n },\n )\n\n // Function to subscribe to the query\n const subscribe = (callback: (results: Results<T>) => void) => {\n if (dead) {\n throw new Error(\n 'Live query is no longer active and cannot be subscribed to',\n )\n }\n callbacks.push(callback)\n }\n\n // Function to unsubscribe from the query\n // If no function is provided, unsubscribe all callbacks\n // If there are no callbacks, unsubscribe from the notify triggers\n const unsubscribe = async (callback?: (results: Results<T>) => void) => {\n if (callback) {\n callbacks = callbacks.filter((callback) => callback !== callback)\n } else {\n callbacks = []\n }\n if (callbacks.length === 0 && !dead) {\n dead = true\n await pg.transaction(async (tx) => {\n await Promise.all(unsubList.map((unsub) => unsub(tx)))\n await tx.exec(`\n DROP VIEW IF EXISTS live_query_${id}_view;\n DEALLOCATE live_query_${id}_get;\n `)\n })\n }\n }\n\n // If the signal has already been aborted, unsubscribe\n if (signal?.aborted) {\n await unsubscribe()\n } else {\n // Add an event listener to unsubscribe if the signal is aborted\n signal?.addEventListener(\n 'abort',\n () => {\n unsubscribe()\n },\n { once: true },\n )\n }\n\n // Run the callback with the initial results\n runResultCallbacks(callbacks, results!)\n\n // Return the initial results\n return {\n initialResults: results!,\n subscribe,\n unsubscribe,\n refresh,\n } satisfies LiveQuery<T>\n },\n\n async changes<T>(\n query: string | LiveChangesOptions<T>,\n params?: any[] | null,\n key?: string,\n callback?: (changes: Array<Change<T>>) => void,\n ) {\n let signal: AbortSignal | undefined\n if (typeof query !== 'string') {\n signal = query.signal\n params = query.params\n key = query.key\n callback = query.callback\n query = query.query\n }\n if (!key) {\n throw new Error('key is required for changes queries')\n }\n let callbacks: Array<(changes: Array<Change<T>>) => void> = callback\n ? [callback]\n : []\n const id = uuid().replace(/-/g, '')\n let dead = false\n\n let stateSwitch: 1 | 2 = 1\n let changes: Results<Change<T>>\n\n let unsubList: Array<(tx?: Transaction) => Promise<void>>\n\n const init = async () => {\n await pg.transaction(async (tx) => {\n // Create a temporary view with the query\n const formattedQuery = await formatQuery(pg, query, params, tx)\n await tx.query(\n `CREATE OR REPLACE TEMP VIEW live_query_${id}_view AS ${formattedQuery}`,\n )\n\n // Get the tables used in the view and add triggers to notify when they change\n const tables = await getTablesForView(tx, `live_query_${id}_view`)\n await addNotifyTriggersToTables(tx, tables, tableNotifyTriggersAdded)\n\n // Get the columns of the view\n const columns = [\n ...(\n await tx.query<any>(`\n SELECT column_name, data_type, udt_name\n FROM information_schema.columns \n WHERE table_name = 'live_query_${id}_view'\n `)\n ).rows,\n { column_name: '__after__', data_type: 'integer' },\n ]\n\n // Init state tables as empty temp table\n await tx.exec(`\n CREATE TEMP TABLE live_query_${id}_state1 (LIKE live_query_${id}_view INCLUDING ALL);\n CREATE TEMP TABLE live_query_${id}_state2 (LIKE live_query_${id}_view INCLUDING ALL);\n `)\n\n // Create Diff views and prepared statements\n for (const curr of [1, 2]) {\n const prev = curr === 1 ? 2 : 1\n await tx.exec(`\n PREPARE live_query_${id}_diff${curr} AS\n WITH\n prev AS (SELECT LAG(\"${key}\") OVER () as __after__, * FROM live_query_${id}_state${prev}),\n curr AS (SELECT LAG(\"${key}\") OVER () as __after__, * FROM live_query_${id}_state${curr}),\n data_diff AS (\n -- INSERT operations: Include all columns\n SELECT \n 'INSERT' AS __op__,\n ${columns\n .map(\n ({ column_name }) =>\n `curr.\"${column_name}\" AS \"${column_name}\"`,\n )\n .join(',\\n')},\n ARRAY[]::text[] AS __changed_columns__\n FROM curr\n LEFT JOIN prev ON curr.${key} = prev.${key}\n WHERE prev.${key} IS NULL\n UNION ALL\n -- DELETE operations: Include only the primary key\n SELECT \n 'DELETE' AS __op__,\n ${columns\n .map(({ column_name, data_type, udt_name }) => {\n if (column_name === key) {\n return `prev.\"${column_name}\" AS \"${column_name}\"`\n } else {\n return `NULL${data_type === 'USER-DEFINED' ? `::${udt_name}` : ``} AS \"${column_name}\"`\n }\n })\n .join(',\\n')},\n ARRAY[]::text[] AS __changed_columns__\n FROM prev\n LEFT JOIN curr ON prev.${key} = curr.${key}\n WHERE curr.${key} IS NULL\n UNION ALL\n -- UPDATE operations: Include only changed columns\n SELECT \n 'UPDATE' AS __op__,\n ${columns\n .map(({ column_name, data_type, udt_name }) =>\n column_name === key\n ? `curr.\"${column_name}\" AS \"${column_name}\"`\n : `CASE \n WHEN curr.\"${column_name}\" IS DISTINCT FROM prev.\"${column_name}\" \n THEN curr.\"${column_name}\"\n ELSE NULL${data_type === 'USER-DEFINED' ? `::${udt_name}` : ``}\n END AS \"${column_name}\"`,\n )\n .join(',\\n')},\n ARRAY(SELECT unnest FROM unnest(ARRAY[${columns\n .filter(({ column_name }) => column_name !== key)\n .map(\n ({ column_name }) =>\n `CASE\n WHEN curr.\"${column_name}\" IS DISTINCT FROM prev.\"${column_name}\" \n THEN '${column_name}' \n ELSE NULL \n END`,\n )\n .join(\n ', ',\n )}]) WHERE unnest IS NOT NULL) AS __changed_columns__\n FROM curr\n INNER JOIN prev ON curr.${key} = prev.${key}\n WHERE NOT (curr IS NOT DISTINCT FROM prev)\n )\n SELECT * FROM data_diff;\n `)\n }\n\n // Setup the listeners\n unsubList = await Promise.all(\n tables!.map((table) =>\n tx.listen(\n `\"table_change__${table.schema_oid}__${table.table_oid}\"`,\n async () => {\n refresh()\n },\n ),\n ),\n )\n })\n }\n\n await init()\n\n const refresh = debounceMutex(async () => {\n if (callbacks.length === 0 && changes) {\n return\n }\n let reset = false\n for (let i = 0; i < 5; i++) {\n try {\n await pg.transaction(async (tx) => {\n // Populate the state table\n await tx.exec(`\n INSERT INTO live_query_${id}_state${stateSwitch} \n SELECT * FROM live_query_${id}_view;\n `)\n\n // Get the changes\n changes = await tx.query<any>(\n `EXECUTE live_query_${id}_diff${stateSwitch};`,\n )\n\n // Switch state\n stateSwitch = stateSwitch === 1 ? 2 : 1\n\n // Truncate the old state table\n await tx.exec(`\n TRUNCATE live_query_${id}_state${stateSwitch};\n `)\n })\n break\n } catch (e) {\n const msg = (e as Error).message\n if (\n msg ===\n `relation \"live_query_${id}_state${stateSwitch}\" does not exist`\n ) {\n // If the state table does not exist, reset and try again\n // This can happen if using the multi-tab worker\n reset = true\n await init()\n continue\n } else {\n throw e\n }\n }\n }\n\n runChangeCallbacks(callbacks, [\n ...(reset\n ? [\n {\n __op__: 'RESET' as const,\n },\n ]\n : []),\n ...changes!.rows,\n ])\n })\n\n // Function to subscribe to the query\n const subscribe = (callback: (changes: Array<Change<T>>) => void) => {\n if (dead) {\n throw new Error(\n 'Live query is no longer active and cannot be subscribed to',\n )\n }\n callbacks.push(callback)\n }\n\n // Function to unsubscribe from the query\n const unsubscribe = async (\n callback?: (changes: Array<Change<T>>) => void,\n ) => {\n if (callback) {\n callbacks = callbacks.filter((callback) => callback !== callback)\n } else {\n callbacks = []\n }\n if (callbacks.length === 0 && !dead) {\n dead = true\n await pg.transaction(async (tx) => {\n await Promise.all(unsubList.map((unsub) => unsub(tx)))\n await tx.exec(`\n DROP VIEW IF EXISTS live_query_${id}_view;\n DROP TABLE IF EXISTS live_query_${id}_state1;\n DROP TABLE IF EXISTS live_query_${id}_state2;\n DEALLOCATE live_query_${id}_diff1;\n DEALLOCATE live_query_${id}_diff2;\n `)\n })\n }\n }\n\n // If the signal has already been aborted, unsubscribe\n if (signal?.aborted) {\n await unsubscribe()\n } else {\n // Add an event listener to unsubscribe if the signal is aborted\n signal?.addEventListener(\n 'abort',\n () => {\n unsubscribe()\n },\n { once: true },\n )\n }\n\n // Run the callback with the initial changes\n await refresh()\n\n // Fields\n const fields = changes!.fields.filter(\n (field) =>\n !['__after__', '__op__', '__changed_columns__'].includes(field.name),\n )\n\n // Return the initial results\n return {\n fields,\n initialChanges: changes!.rows,\n subscribe,\n unsubscribe,\n refresh,\n } satisfies LiveChanges<T>\n },\n\n async incrementalQuery<T>(\n query: string | LiveIncrementalQueryOptions<T>,\n params?: any[] | null,\n key?: string,\n callback?: (results: Results<T>) => void,\n ) {\n let signal: AbortSignal | undefined\n if (typeof query !== 'string') {\n signal = query.signal\n params = query.params\n key = query.key\n callback = query.callback\n query = query.query\n }\n if (!key) {\n throw new Error('key is required for incremental queries')\n }\n let callbacks: Array<(results: Results<T>) => void> = callback\n ? [callback]\n : []\n const rowsMap: Map<any, any> = new Map()\n const afterMap: Map<any, any> = new Map()\n let lastRows: T[] = []\n let firstRun = true\n\n const {\n fields,\n unsubscribe: unsubscribeChanges,\n refresh,\n } = await namespaceObj.changes<T>(query, params, key, (changes) => {\n // Process the changes\n for (const change of changes) {\n const {\n __op__: op,\n __changed_columns__: changedColumns,\n ...obj\n } = change as typeof change & { [key: string]: any }\n switch (op) {\n case 'RESET':\n rowsMap.clear()\n afterMap.clear()\n break\n case 'INSERT':\n rowsMap.set(obj[key], obj)\n afterMap.set(obj.__after__, obj[key])\n break\n case 'DELETE': {\n const oldObj = rowsMap.get(obj[key])\n rowsMap.delete(obj[key])\n // null is the starting point, we don't delete it as another insert\n // may have happened thats replacing it\n if (oldObj.__after__ !== null) {\n afterMap.delete(oldObj.__after__)\n }\n break\n }\n case 'UPDATE': {\n const newObj = { ...(rowsMap.get(obj[key]) ?? {}) }\n for (const columnName of changedColumns) {\n newObj[columnName] = obj[columnName]\n if (columnName === '__after__') {\n afterMap.set(obj.__after__, obj[key])\n }\n }\n rowsMap.set(obj[key], newObj)\n break\n }\n }\n }\n\n // Get the rows in order\n const rows: T[] = []\n let lastKey: any = null\n for (let i = 0; i < rowsMap.size; i++) {\n const nextKey = afterMap.get(lastKey)\n const obj = rowsMap.get(nextKey)\n if (!obj) {\n break\n }\n // Remove the __after__ key from the exposed row\n const cleanObj = { ...obj }\n delete cleanObj.__after__\n rows.push(cleanObj)\n lastKey = nextKey\n }\n lastRows = rows\n\n // Run the callbacks\n if (!firstRun) {\n runResultCallbacks(callbacks, {\n rows,\n fields,\n })\n }\n })\n\n firstRun = false\n runResultCallbacks(callbacks, {\n rows: lastRows,\n fields,\n })\n\n const subscribe = (callback: (results: Results<T>) => void) => {\n callbacks.push(callback)\n }\n\n const unsubscribe = async (callback?: (results: Results<T>) => void) => {\n if (callback) {\n callbacks = callbacks.filter((callback) => callback !== callback)\n } else {\n callbacks = []\n }\n if (callbacks.length === 0) {\n await unsubscribeChanges()\n }\n }\n\n if (signal?.aborted) {\n await unsubscribe()\n } else {\n signal?.addEventListener(\n 'abort',\n () => {\n unsubscribe()\n },\n { once: true },\n )\n }\n\n return {\n initialResults: {\n rows: lastRows,\n fields,\n },\n subscribe,\n unsubscribe,\n refresh,\n } satisfies LiveQuery<T>\n },\n }\n\n return {\n namespaceObj,\n }\n}\n\nexport const live = {\n name: 'Live Queries',\n setup,\n} satisfies Extension\n\nexport type PGliteWithLive = PGliteInterface & {\n live: LiveNamespace\n}\n\n/**\n * Get a list of all the tables used in a view, recursively\n * @param tx a transaction or PGlite instance\n * @param viewName the name of the view\n * @returns list of tables used in the view\n */\nasync function getTablesForView(\n tx: Transaction | PGliteInterface,\n viewName: string,\n): Promise<\n {\n table_name: string\n schema_name: string\n table_oid: number\n schema_oid: number\n }[]\n> {\n const result = await tx.query<{\n table_name: string\n schema_name: string\n table_oid: number\n schema_oid: number\n }>(\n `\n WITH RECURSIVE view_dependencies AS (\n -- Base case: Get the initial view's dependencies\n SELECT DISTINCT\n cl.relname AS dependent_name,\n n.nspname AS schema_name,\n cl.oid AS dependent_oid,\n n.oid AS schema_oid,\n cl.relkind = 'v' AS is_view\n FROM pg_rewrite r\n JOIN pg_depend d ON r.oid = d.objid\n JOIN pg_class cl ON d.refobjid = cl.oid\n JOIN pg_namespace n ON cl.relnamespace = n.oid\n WHERE\n r.ev_class = (\n SELECT oid FROM pg_class WHERE relname = $1 AND relkind = 'v'\n )\n AND d.deptype = 'n'\n\n UNION ALL\n\n -- Recursive case: Traverse dependencies for views\n SELECT DISTINCT\n cl.relname AS dependent_name,\n n.nspname AS schema_name,\n cl.oid AS dependent_oid,\n n.oid AS schema_oid,\n cl.relkind = 'v' AS is_view\n FROM view_dependencies vd\n JOIN pg_rewrite r ON vd.dependent_name = (\n SELECT relname FROM pg_class WHERE oid = r.ev_class AND relkind = 'v'\n )\n JOIN pg_depend d ON r.oid = d.objid\n JOIN pg_class cl ON d.refobjid = cl.oid\n JOIN pg_namespace n ON cl.relnamespace = n.oid\n WHERE d.deptype = 'n'\n )\n SELECT DISTINCT\n dependent_name AS table_name,\n schema_name,\n dependent_oid AS table_oid,\n schema_oid\n FROM view_dependencies\n WHERE NOT is_view; -- Exclude intermediate views\n `,\n [viewName],\n )\n\n return result.rows.map((row) => ({\n table_name: row.table_name,\n schema_name: row.schema_name,\n table_oid: row.table_oid,\n schema_oid: row.schema_oid,\n }))\n}\n\n/**\n * Add triggers to tables to notify when they change\n * @param tx a transaction or PGlite instance\n * @param tables list of tables to add triggers to\n */\nasync function addNotifyTriggersToTables(\n tx: Transaction | PGliteInterface,\n tables: {\n table_name: string\n table_oid: number\n schema_name: string\n schema_oid: number\n }[],\n tableNotifyTriggersAdded: Set<string>,\n) {\n const triggers = tables\n .filter(\n (table) =>\n !tableNotifyTriggersAdded.has(`${table.schema_oid}_${table.table_oid}`),\n )\n .map((table) => {\n return `\n CREATE OR REPLACE FUNCTION \"_notify_${table.schema_oid}_${table.table_oid}\"() RETURNS TRIGGER AS $$\n BEGIN\n PERFORM pg_notify('table_change__${table.schema_oid}__${table.table_oid}', '');\n RETURN NULL;\n END;\n $$ LANGUAGE plpgsql;\n CREATE OR REPLACE TRIGGER \"_notify_trigger_${table.schema_oid}_${table.table_oid}\"\n AFTER INSERT OR UPDATE OR DELETE ON \"${table.schema_name}\".\"${table.table_name}\"\n FOR EACH STATEMENT EXECUTE FUNCTION \"_notify_${table.schema_oid}_${table.table_oid}\"();\n `\n })\n .join('\\n')\n if (triggers.trim() !== '') {\n await tx.exec(triggers)\n }\n tables.map((table) =>\n tableNotifyTriggersAdded.add(`${table.schema_oid}_${table.table_oid}`),\n )\n}\n\nconst runResultCallbacks = <T>(\n callbacks: Array<(results: Results<T>) => void>,\n results: Results<T>,\n) => {\n for (const callback of callbacks) {\n callback(results)\n }\n}\n\nconst runChangeCallbacks = <T>(\n callbacks: Array<(changes: Array<Change<T>>) => void>,\n changes: Array<Change<T>>,\n) => {\n for (const callback of callbacks) {\n callback(changes)\n }\n}\n","/**\n * Calculates the byte length of a UTF-8 encoded string\n * Adapted from https://stackoverflow.com/a/23329386\n * @param str - UTF-8 encoded string\n * @returns byte length of string\n */\nfunction byteLengthUtf8(str: string): number {\n let byteLength = str.length\n for (let i = str.length - 1; i >= 0; i--) {\n const code = str.charCodeAt(i)\n if (code > 0x7f && code <= 0x7ff) byteLength++\n else if (code > 0x7ff && code <= 0xffff) byteLength += 2\n if (code >= 0xdc00 && code <= 0xdfff) i-- // trail surrogate\n }\n return byteLength\n}\n\nexport { byteLengthUtf8 }\n","import { byteLengthUtf8 } from './string-utils'\n\nexport class Writer {\n #bufferView: DataView\n #offset: number = 5\n\n readonly #littleEndian = false as const\n readonly #encoder = new TextEncoder()\n readonly #headerPosition: number = 0\n constructor(private size = 256) {\n this.#bufferView = this.#allocateBuffer(size)\n }\n\n #allocateBuffer(size: number): DataView {\n return new DataView(new ArrayBuffer(size))\n }\n\n #ensure(size: number): void {\n const remaining = this.#bufferView.byteLength - this.#offset\n if (remaining < size) {\n const oldBuffer = this.#bufferView.buffer\n // exponential growth factor of around ~ 1.5\n // https://stackoverflow.com/questions/2269063/buffer-growth-strategy\n const newSize = oldBuffer.byteLength + (oldBuffer.byteLength >> 1) + size\n this.#bufferView = this.#allocateBuffer(newSize)\n new Uint8Array(this.#bufferView.buffer).set(new Uint8Array(oldBuffer))\n }\n }\n\n public addInt32(num: number): Writer {\n this.#ensure(4)\n this.#bufferView.setInt32(this.#offset, num, this.#littleEndian)\n this.#offset += 4\n return this\n }\n\n public addInt16(num: number): Writer {\n this.#ensure(2)\n this.#bufferView.setInt16(this.#offset, num, this.#littleEndian)\n this.#offset += 2\n return this\n }\n\n public addCString(string: string): Writer {\n if (string) {\n // TODO(msfstef): might be faster to extract `addString` code and\n // ensure length + 1 once rather than length and then +1?\n this.addString(string)\n }\n\n // set null terminator\n this.#ensure(1)\n this.#bufferView.setUint8(this.#offset, 0)\n this.#offset++\n return this\n }\n\n public addString(string: string = ''): Writer {\n const length = byteLengthUtf8(string)\n this.#ensure(length)\n this.#encoder.encodeInto(\n string,\n new Uint8Array(this.#bufferView.buffer, this.#offset),\n )\n this.#offset += length\n return this\n }\n\n public add(otherBuffer: ArrayBuffer): Writer {\n this.#ensure(otherBuffer.byteLength)\n new Uint8Array(this.#bufferView.buffer).set(\n new Uint8Array(otherBuffer),\n this.#offset,\n )\n\n this.#offset += otherBuffer.byteLength\n return this\n }\n\n #join(code?: number): ArrayBuffer {\n if (code) {\n this.#bufferView.setUint8(this.#headerPosition, code)\n // length is everything in this packet minus the code\n const length = this.#offset - (this.#headerPosition + 1)\n this.#bufferView.setInt32(\n this.#headerPosition + 1,\n length,\n this.#littleEndian,\n )\n }\n return this.#bufferView.buffer.slice(code ? 0 : 5, this.#offset)\n }\n\n public flush(code?: number): Uint8Array {\n const result = this.#join(code)\n this.#offset = 5\n this.#bufferView = this.#allocateBuffer(this.size)\n return new Uint8Array(result)\n }\n}\n","import { Writer } from './buffer-writer'\nimport { byteLengthUtf8 } from './string-utils'\n\nconst enum code {\n startup = 0x70,\n query = 0x51,\n parse = 0x50,\n bind = 0x42,\n execute = 0x45,\n flush = 0x48,\n sync = 0x53,\n end = 0x58,\n close = 0x43,\n describe = 0x44,\n copyFromChunk = 0x64,\n copyDone = 0x63,\n copyFail = 0x66,\n}\n\ntype LegalValue = string | ArrayBuffer | ArrayBufferView | null\n\nconst writer = new Writer()\n\nconst startup = (opts: Record<string, string>): Uint8Array => {\n // protocol version\n writer.addInt16(3).addInt16(0)\n for (const key of Object.keys(opts)) {\n writer.addCString(key).addCString(opts[key])\n }\n\n writer.addCString('client_encoding').addCString('UTF8')\n\n const bodyBuffer = writer.addCString('').flush()\n // this message is sent without a code\n\n const length = bodyBuffer.byteLength + 4\n\n return new Writer().addInt32(length).add(bodyBuffer).flush()\n}\n\nconst requestSsl = (): Uint8Array => {\n const bufferView = new DataView(new ArrayBuffer(8))\n bufferView.setInt32(0, 8, false)\n bufferView.setInt32(4, 80877103, false)\n return new Uint8Array(bufferView.buffer)\n}\n\nconst password = (password: string): Uint8Array => {\n return writer.addCString(password).flush(code.startup)\n}\n\nconst sendSASLInitialResponseMessage = (\n mechanism: string,\n initialResponse: string,\n): Uint8Array => {\n // 0x70 = 'p'\n writer\n .addCString(mechanism)\n .addInt32(byteLengthUtf8(initialResponse))\n .addString(initialResponse)\n\n return writer.flush(code.startup)\n}\n\nconst sendSCRAMClientFinalMessage = (additionalData: string): Uint8Array => {\n return writer.addString(additionalData).flush(code.startup)\n}\n\nconst query = (text: string): Uint8Array => {\n return writer.addCString(text).flush(code.query)\n}\n\ntype ParseOpts = {\n name?: string\n types?: number[]\n text: string\n}\n\nconst emptyValueArray: LegalValue[] = []\n\nconst parse = (query: ParseOpts): Uint8Array => {\n // expect something like this:\n // { name: 'queryName',\n // text: 'select * from blah',\n // types: ['int8', 'bool'] }\n\n // normalize missing query names to allow for null\n const name = query.name ?? ''\n if (name.length > 63) {\n /* eslint-disable no-console */\n console.error(\n 'Warning! Postgres only supports 63 characters for query names.',\n )\n console.error('You supplied %s (%s)', name, name.length)\n console.error(\n 'This can cause conflicts and silent errors executing queries',\n )\n /* eslint-enable no-console */\n }\n\n const buffer = writer\n .addCString(name) // name of query\n .addCString(query.text) // actual query text\n .addInt16(query.types?.length ?? 0)\n\n query.types?.forEach((type) => buffer.addInt32(type))\n\n return writer.flush(code.parse)\n}\n\ntype ValueMapper = (param: unknown, index: number) => LegalValue\n\ntype BindOpts = {\n portal?: string\n binary?: boolean\n statement?: string\n values?: LegalValue[]\n // optional map from JS value to postgres value per parameter\n valueMapper?: ValueMapper\n}\n\nconst paramWriter = new Writer()\n\n// make this a const enum so typescript will inline the value\nconst enum ParamType {\n STRING = 0,\n BINARY = 1,\n}\n\nconst writeValues = (values: LegalValue[], valueMapper?: ValueMapper): void => {\n for (let i = 0; i < values.length; i++) {\n const mappedVal = valueMapper ? valueMapper(values[i], i) : values[i]\n if (mappedVal === null) {\n // add the param type (string) to the writer\n writer.addInt16(ParamType.STRING)\n // write -1 to the param writer to indicate null\n paramWriter.addInt32(-1)\n } else if (\n mappedVal instanceof ArrayBuffer ||\n ArrayBuffer.isView(mappedVal)\n ) {\n const buffer = ArrayBuffer.isView(mappedVal)\n ? mappedVal.buffer.slice(\n mappedVal.byteOffset,\n mappedVal.byteOffset + mappedVal.byteLength,\n )\n : mappedVal\n // add the param type (binary) to the writer\n writer.addInt16(ParamType.BINARY)\n // add the buffer to the param writer\n paramWriter.addInt32(buffer.byteLength)\n paramWriter.add(buffer)\n } else {\n // add the param type (string) to the writer\n writer.addInt16(ParamType.STRING)\n paramWriter.addInt32(byteLengthUtf8(mappedVal))\n paramWriter.addString(mappedVal)\n }\n }\n}\n\nconst bind = (config: BindOpts = {}): Uint8Array => {\n // normalize config\n const portal = config.portal ?? ''\n const statement = config.statement ?? ''\n const binary = config.binary ?? false\n const values = config.values ?? emptyValueArray\n const len = values.length\n\n writer.addCString(portal).addCString(statement)\n writer.addInt16(len)\n\n writeValues(values, config.valueMapper)\n\n writer.addInt16(len)\n writer.add(paramWriter.flush())\n\n // format code\n writer.addInt16(binary ? ParamType.BINARY : ParamType.STRING)\n return writer.flush(code.bind)\n}\n\ntype ExecOpts = {\n portal?: string\n rows?: number\n}\n\nconst emptyExecute = new Uint8Array([\n code.execute,\n 0x00,\n 0x00,\n 0x00,\n 0x09,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n])\n\nconst execute = (config?: ExecOpts): Uint8Array => {\n // this is the happy path for most queries\n if (!config || (!config.portal && !config.rows)) {\n return emptyExecute\n }\n\n const portal = config.portal ?? ''\n const rows = config.rows ?? 0\n\n const portalLength = byteLengthUtf8(portal)\n const len = 4 + portalLength + 1 + 4\n // one extra bit for code\n const bufferView = new DataView(new ArrayBuffer(1 + len))\n bufferView.setUint8(0, code.execute)\n bufferView.setInt32(1, len, false)\n new TextEncoder().encodeInto(portal, new Uint8Array(bufferView.buffer, 5))\n bufferView.setUint8(portalLength + 5, 0) // null terminate portal cString\n bufferView.setUint32(bufferView.byteLength - 4, rows, false)\n return new Uint8Array(bufferView.buffer)\n}\n\nconst cancel = (processID: number, secretKey: number): Uint8Array => {\n const bufferView = new DataView(new ArrayBuffer(16))\n bufferView.setInt32(0, 16, false)\n bufferView.setInt16(4, 1234, false)\n bufferView.setInt16(6, 5678, false)\n bufferView.setInt32(8, processID, false)\n bufferView.setInt32(12, secretKey, false)\n return new Uint8Array(bufferView.buffer)\n}\n\ntype PortalOpts = {\n type: 'S' | 'P'\n name?: string\n}\n\nconst cstringMessage = (code: code, string: string): Uint8Array => {\n const writer = new Writer()\n writer.addCString(string)\n return writer.flush(code)\n}\n\nconst emptyDescribePortal = writer.addCString('P').flush(code.describe)\nconst emptyDescribeStatement = writer.addCString('S').flush(code.describe)\n\nconst describe = (msg: PortalOpts): Uint8Array => {\n return msg.name\n ? cstringMessage(code.describe, `${msg.type}${msg.name ?? ''}`)\n : msg.type === 'P'\n ? emptyDescribePortal\n : emptyDescribeStatement\n}\n\nconst close = (msg: PortalOpts): Uint8Array => {\n const text = `${msg.type}${msg.name ?? ''}`\n return cstringMessage(code.close, text)\n}\n\nconst copyData = (chunk: ArrayBuffer): Uint8Array => {\n return writer.add(chunk).flush(code.copyFromChunk)\n}\n\nconst copyFail = (message: string): Uint8Array => {\n return cstringMessage(code.copyFail, message)\n}\n\nconst codeOnlyBuffer = (code: code): Uint8Array =>\n new Uint8Array([code, 0x00, 0x00, 0x00, 0x04])\n\nconst flushBuffer = codeOnlyBuffer(code.flush)\nconst syncBuffer = codeOnlyBuffer(code.sync)\nconst endBuffer = codeOnlyBuffer(code.end)\nconst copyDoneBuffer = codeOnlyBuffer(code.copyDone)\n\nconst serialize = {\n startup,\n password,\n requestSsl,\n sendSASLInitialResponseMessage,\n sendSCRAMClientFinalMessage,\n query,\n parse,\n bind,\n execute,\n describe,\n close,\n flush: () => flushBuffer,\n sync: () => syncBuffer,\n end: () => endBuffer,\n copyData,\n copyDone: () => copyDoneBuffer,\n copyFail,\n cancel,\n}\n\nexport { serialize }\n","const emptyBuffer = new ArrayBuffer(0)\n\nexport class BufferReader {\n #bufferView: DataView = new DataView(emptyBuffer)\n #offset: number\n\n // TODO(bmc): support non-utf8 encoding?\n readonly #encoding: string = 'utf-8' as const\n readonly #decoder = new TextDecoder(this.#encoding)\n readonly #littleEndian: boolean = false as const\n\n constructor(offset: number = 0) {\n this.#offset = offset\n }\n\n public setBuffer(offset: number, buffer: ArrayBuffer): void {\n this.#offset = offset\n this.#bufferView = new DataView(buffer)\n }\n\n public int16(): number {\n // const result = this.buffer.readInt16BE(this.#offset)\n const result = this.#bufferView.getInt16(this.#offset, this.#littleEndian)\n this.#offset += 2\n return result\n }\n\n public byte(): number {\n // const result = this.bufferView[this.#offset]\n const result = this.#bufferView.getUint8(this.#offset)\n this.#offset++\n return result\n }\n\n public int32(): number {\n // const result = this.buffer.readInt32BE(this.#offset)\n const result = this.#bufferView.getInt32(this.#offset, this.#littleEndian)\n this.#offset += 4\n return result\n }\n\n public string(length: number): string {\n // const result = this.#bufferView.toString(\n // this.#encoding,\n // this.#offset,\n // this.#offset + length,\n // )\n // this.#offset += length\n\n const result = this.#decoder.decode(this.bytes(length))\n return result\n }\n\n public cstring(): string {\n // const start = this.#offset\n // let end = start\n // while (this.#bufferView[end++] !== 0) {}\n\n const start = this.#offset\n let end = start\n while (this.#bufferView.getUint8(end++) !== 0) {\n // no-op - increment until terminator reached\n }\n const result = this.string(end - start - 1)\n this.#offset = end\n return result\n }\n\n public bytes(length: number): Uint8Array {\n // const result = this.buffer.slice(this.#offset, this.#offset + length)\n const result = this.#bufferView.buffer.slice(\n this.#offset,\n this.#offset + length,\n )\n this.#offset += length\n return new Uint8Array(result)\n }\n}\n","import {\n bindComplete,\n parseComplete,\n closeComplete,\n noData,\n portalSuspended,\n copyDone,\n replicationStart,\n emptyQuery,\n ReadyForQueryMessage,\n CommandCompleteMessage,\n CopyDataMessage,\n CopyResponse,\n NotificationResponseMessage,\n RowDescriptionMessage,\n ParameterDescriptionMessage,\n Field,\n DataRowMessage,\n ParameterStatusMessage,\n BackendKeyDataMessage,\n DatabaseError,\n BackendMessage,\n MessageName,\n NoticeMessage,\n AuthenticationMessage,\n AuthenticationOk,\n AuthenticationCleartextPassword,\n AuthenticationMD5Password,\n AuthenticationSASL,\n AuthenticationSASLContinue,\n AuthenticationSASLFinal,\n} from './messages'\nimport { BufferParameter, Modes } from './types'\nimport { BufferReader } from './buffer-reader'\n\n// every message is prefixed with a single bye\nconst CODE_LENGTH = 1 as const\n// every message has an int32 length which includes itself but does\n// NOT include the code in the length\nconst LEN_LENGTH = 4 as const\n\nconst HEADER_LENGTH = CODE_LENGTH + LEN_LENGTH\n\nexport type Packet = {\n code: number\n packet: ArrayBuffer\n}\n\nconst emptyBuffer = new ArrayBuffer(0)\n\nconst enum MessageCodes {\n DataRow = 0x44, // D\n ParseComplete = 0x31, // 1\n BindComplete = 0x32, // 2\n CloseComplete = 0x33, // 3\n CommandComplete = 0x43, // C\n ReadyForQuery = 0x5a, // Z\n NoData = 0x6e, // n\n NotificationResponse = 0x41, // A\n AuthenticationResponse = 0x52, // R\n ParameterStatus = 0x53, // S\n BackendKeyData = 0x4b, // K\n ErrorMessage = 0x45, // E\n NoticeMessage = 0x4e, // N\n RowDescriptionMessage = 0x54, // T\n ParameterDescriptionMessage = 0x74, // t\n PortalSuspended = 0x73, // s\n ReplicationStart = 0x57, // W\n EmptyQuery = 0x49, // I\n CopyIn = 0x47, // G\n CopyOut = 0x48, // H\n CopyDone = 0x63, // c\n CopyData = 0x64, // d\n}\n\nexport type MessageCallback = (msg: BackendMessage) => void\n\nexport class Parser {\n #bufferView: DataView = new DataView(emptyBuffer)\n #bufferRemainingLength: number = 0\n #bufferOffset: number = 0\n #reader = new BufferReader()\n\n public parse(buffer: BufferParameter, callback: MessageCallback) {\n this.#mergeBuffer(\n ArrayBuffer.isView(buffer)\n ? buffer.buffer.slice(\n buffer.byteOffset,\n buffer.byteOffset + buffer.byteLength,\n )\n : buffer,\n )\n const bufferFullLength = this.#bufferOffset + this.#bufferRemainingLength\n let offset = this.#bufferOffset\n while (offset + HEADER_LENGTH <= bufferFullLength) {\n // code is 1 byte long - it identifies the message type\n const code = this.#bufferView.getUint8(offset)\n // length is 1 Uint32BE - it is the length of the message EXCLUDING the code\n const length = this.#bufferView.getUint32(offset + CODE_LENGTH, false)\n const fullMessageLength = CODE_LENGTH + length\n if (fullMessageLength + offset <= bufferFullLength && length > 0) {\n const message = this.#handlePacket(\n offset + HEADER_LENGTH,\n code,\n length,\n this.#bufferView.buffer,\n )\n callback(message)\n offset += fullMessageLength\n } else {\n break\n }\n }\n if (offset === bufferFullLength) {\n // No more use for the buffer\n this.#bufferView = new DataView(emptyBuffer)\n this.#bufferRemainingLength = 0\n this.#bufferOffset = 0\n } else {\n // Adjust the cursors of remainingBuffer\n this.#bufferRemainingLength = bufferFullLength - offset\n this.#bufferOffset = offset\n }\n }\n\n #mergeBuffer(buffer: ArrayBuffer): void {\n if (this.#bufferRemainingLength > 0) {\n const newLength = this.#bufferRemainingLength + buffer.byteLength\n const newFullLength = newLength + this.#bufferOffset\n if (newFullLength > this.#bufferView.byteLength) {\n // We can't concat the new buffer with the remaining one\n let newBuffer: ArrayBuffer\n if (\n newLength <= this.#bufferView.byteLength &&\n this.#bufferOffset >= this.#bufferRemainingLength\n ) {\n // We can move the relevant part to the beginning of the buffer instead of allocating a new buffer\n newBuffer = this.#bufferView.buffer\n } else {\n // Allocate a new larger buffer\n let newBufferLength = this.#bufferView.byteLength * 2\n while (newLength >= newBufferLength) {\n newBufferLength *= 2\n }\n newBuffer = new ArrayBuffer(newBufferLength)\n }\n // Move the remaining buffer to the new one\n new Uint8Array(newBuffer).set(\n new Uint8Array(\n this.#bufferView.buffer,\n this.#bufferOffset,\n this.#bufferRemainingLength,\n ),\n )\n this.#bufferView = new DataView(newBuffer)\n this.#bufferOffset = 0\n }\n\n // Concat the new buffer with the remaining one\n new Uint8Array(this.#bufferView.buffer).set(\n new Uint8Array(buffer),\n this.#bufferOffset + this.#bufferRemainingLength,\n )\n this.#bufferRemainingLength = newLength\n } else {\n this.#bufferView = new DataView(buffer)\n this.#bufferOffset = 0\n this.#bufferRemainingLength = buffer.byteLength\n }\n }\n\n #handlePacket(\n offset: number,\n code: number,\n length: number,\n bytes: ArrayBuffer,\n ): BackendMessage {\n switch (code) {\n case MessageCodes.BindComplete:\n return bindComplete\n case MessageCodes.ParseComplete:\n return parseComplete\n case MessageCodes.CloseComplete:\n return closeComplete\n case MessageCodes.NoData:\n return noData\n case MessageCodes.PortalSuspended:\n return portalSuspended\n case MessageCodes.CopyDone:\n return copyDone\n case MessageCodes.ReplicationStart:\n return replicationStart\n case MessageCodes.EmptyQuery:\n return emptyQuery\n case MessageCodes.DataRow:\n return this.#parseDataRowMessage(offset, length, bytes)\n case MessageCodes.CommandComplete:\n return this.#parseCommandCompleteMessage(offset, length, bytes)\n case MessageCodes.ReadyForQuery:\n return this.#parseReadyForQueryMessage(offset, length, bytes)\n case MessageCodes.NotificationResponse:\n return this.#parseNotificationMessage(offset, length, bytes)\n case MessageCodes.AuthenticationResponse:\n return this.#parseAuthenticationResponse(offset, length, bytes)\n case MessageCodes.ParameterStatus:\n return this.#parseParameterStatusMessage(offset, length, bytes)\n case MessageCodes.BackendKeyData:\n return this.#parseBackendKeyData(offset, length, bytes)\n case MessageCodes.ErrorMessage:\n return this.#parseErrorMessage(offset, length, bytes, 'error')\n case MessageCodes.NoticeMessage:\n return this.#parseErrorMessage(offset, length, bytes, 'notice')\n case MessageCodes.RowDescriptionMessage:\n return this.#parseRowDescriptionMessage(offset, length, bytes)\n case MessageCodes.ParameterDescriptionMessage:\n return this.#parseParameterDescriptionMessage(offset, length, bytes)\n case MessageCodes.CopyIn:\n return this.#parseCopyInMessage(offset, length, bytes)\n case MessageCodes.CopyOut:\n return this.#parseCopyOutMessage(offset, length, bytes)\n case MessageCodes.CopyData:\n return this.#parseCopyData(offset, length, bytes)\n default:\n return new DatabaseError(\n 'received invalid response: ' + code.toString(16),\n length,\n 'error',\n )\n }\n }\n\n #parseReadyForQueryMessage(\n offset: number,\n length: number,\n bytes: ArrayBuffer,\n ) {\n this.#reader.setBuffer(offset, bytes)\n const status = this.#reader.string(1)\n return new ReadyForQueryMessage(length, status)\n }\n\n #parseCommandCompleteMessage(\n offset: number,\n length: number,\n bytes: ArrayBuffer,\n ) {\n this.#reader.setBuffer(offset, bytes)\n const text = this.#reader.cstring()\n return new CommandCompleteMessage(length, text)\n }\n\n #parseCopyData(offset: number, length: number, bytes: ArrayBuffer) {\n const chunk = bytes.slice(offset, offset + (length - 4))\n return new CopyDataMessage(length, new Uint8Array(chunk))\n }\n\n #parseCopyInMessage(offset: number, length: number, bytes: ArrayBuffer) {\n return this.#parseCopyMessage(offset, length, bytes, 'copyInResponse')\n }\n\n #parseCopyOutMessage(offset: number, length: number, bytes: ArrayBuffer) {\n return this.#parseCopyMessage(offset, length, bytes, 'copyOutResponse')\n }\n\n #parseCopyMessage(\n offset: number,\n length: number,\n bytes: ArrayBuffer,\n messageName: MessageName,\n ) {\n this.#reader.setBuffer(offset, bytes)\n const isBinary = this.#reader.byte() !== 0\n const columnCount = this.#reader.int16()\n const message = new CopyResponse(length, messageName, isBinary, columnCount)\n for (let i = 0; i < columnCount; i++) {\n message.columnTypes[i] = this.#reader.int16()\n }\n return message\n }\n\n #parseNotificationMessage(\n offset: number,\n length: number,\n bytes: ArrayBuffer,\n ) {\n this.#reader.setBuffer(offset, bytes)\n const processId = this.#reader.int32()\n const channel = this.#reader.cstring()\n const payload = this.#reader.cstring()\n return new NotificationResponseMessage(length, processId, channel, payload)\n }\n\n #parseRowDescriptionMessage(\n offset: number,\n length: number,\n bytes: ArrayBuffer,\n ) {\n this.#reader.setBuffer(offset, bytes)\n const fieldCount = this.#reader.int16()\n const message = new RowDescriptionMessage(length, fieldCount)\n for (let i = 0; i < fieldCount; i++) {\n message.fields[i] = this.#parseField()\n }\n return message\n }\n\n #parseField(): Field {\n const name = this.#reader.cstring()\n const tableID = this.#reader.int32()\n const columnID = this.#reader.int16()\n const dataTypeID = this.#reader.int32()\n const dataTypeSize = this.#reader.int16()\n const dataTypeModifier = this.#reader.int32()\n const mode = this.#reader.int16() === 0 ? Modes.text : Modes.binary\n return new Field(\n name,\n tableID,\n columnID,\n dataTypeID,\n dataTypeSize,\n dataTypeModifier,\n mode,\n )\n }\n\n #parseParameterDescriptionMessage(\n offset: number,\n length: number,\n bytes: ArrayBuffer,\n ) {\n this.#reader.setBuffer(offset, bytes)\n const parameterCount = this.#reader.int16()\n const message = new ParameterDescriptionMessage(length, parameterCount)\n for (let i = 0; i < parameterCount; i++) {\n message.dataTypeIDs[i] = this.#reader.int32()\n }\n return message\n }\n\n #parseDataRowMessage(offset: number, length: number, bytes: ArrayBuffer) {\n this.#reader.setBuffer(offset, bytes)\n const fieldCount = this.#reader.int16()\n const fields: (string | null)[] = new Array(fieldCount)\n for (let i = 0; i < fieldCount; i++) {\n const len = this.#reader.int32()\n // a -1 for length means the value of the field is null\n fields[i] = len === -1 ? null : this.#reader.string(len)\n }\n return new DataRowMessage(length, fields)\n }\n\n #parseParameterStatusMessage(\n offset: number,\n length: number,\n bytes: ArrayBuffer,\n ) {\n this.#reader.setBuffer(offset, bytes)\n const name = this.#reader.cstring()\n const value = this.#reader.cstring()\n return new ParameterStatusMessage(length, name, value)\n }\n\n #parseBackendKeyData(offset: number, length: number, bytes: ArrayBuffer) {\n this.#reader.setBuffer(offset, bytes)\n const processID = this.#reader.int32()\n const secretKey = this.#reader.int32()\n return new BackendKeyDataMessage(length, processID, secretKey)\n }\n\n #parseAuthenticationResponse(\n offset: number,\n length: number,\n bytes: ArrayBuffer,\n ): AuthenticationMessage {\n this.#reader.setBuffer(offset, bytes)\n const code = this.#reader.int32()\n switch (code) {\n case 0:\n return new AuthenticationOk(length)\n case 3:\n return new AuthenticationCleartextPassword(length)\n\n case 5:\n return new AuthenticationMD5Password(length, this.#reader.bytes(4))\n\n case 10: {\n const mechanisms: string[] = []\n while (true) {\n const mechanism = this.#reader.cstring()\n if (mechanism.length === 0) {\n return new AuthenticationSASL(length, mechanisms)\n }\n mechanisms.push(mechanism)\n }\n }\n case 11:\n return new AuthenticationSASLContinue(\n length,\n this.#reader.string(length - 8),\n )\n\n case 12:\n return new AuthenticationSASLFinal(\n length,\n this.#reader.string(length - 8),\n )\n\n default:\n throw new Error('Unknown authenticationOk message type ' + code)\n }\n }\n\n #parseErrorMessage(\n offset: number,\n length: number,\n bytes: ArrayBuffer,\n name: MessageName,\n ) {\n this.#reader.setBuffer(offset, bytes)\n const fields: Record<string, string> = {}\n let fieldType = this.#reader.string(1)\n while (fieldType !== '\\0') {\n fields[fieldType] = this.#reader.cstring()\n fieldType = this.#reader.string(1)\n }\n\n const messageValue = fields.M\n\n const message =\n name === 'notice'\n ? new NoticeMessage(length, messageValue)\n : new DatabaseError(messageValue, length, name)\n\n message.severity = fields.S\n message.code = fields.C\n message.detail = fields.D\n message.hint = fields.H\n message.position = fields.P\n message.internalPosition = fields.p\n message.internalQuery = fields.q\n message.where = fields.W\n message.schema = fields.s\n message.table = fields.t\n message.column = fields.c\n message.dataType = fields.d\n message.constraint = fields.n\n message.file = fields.F\n message.line = fields.L\n message.routine = fields.R\n return message\n }\n}\n","/*\nBased on postgres.js types.js\nhttps://github.com/porsager/postgres/blob/master/src/types.js\nPublished under the Unlicense:\nhttps://github.com/porsager/postgres/blob/master/UNLICENSE \n*/\n\nimport type { ParserOptions } from './interface.js'\n\nconst JSON_parse = globalThis.JSON.parse\nconst JSON_stringify = globalThis.JSON.stringify\n\nexport const BOOL = 16,\n BYTEA = 17,\n CHAR = 18,\n INT8 = 20,\n INT2 = 21,\n INT4 = 23,\n REGPROC = 24,\n TEXT = 25,\n OID = 26,\n TID = 27,\n XID = 28,\n CID = 29,\n JSON = 114,\n XML = 142,\n PG_NODE_TREE = 194,\n SMGR = 210,\n PATH = 602,\n POLYGON = 604,\n CIDR = 650,\n FLOAT4 = 700,\n FLOAT8 = 701,\n ABSTIME = 702,\n RELTIME = 703,\n TINTERVAL = 704,\n CIRCLE = 718,\n MACADDR8 = 774,\n MONEY = 790,\n MACADDR = 829,\n INET = 869,\n ACLITEM = 1033,\n BPCHAR = 1042,\n VARCHAR = 1043,\n DATE = 1082,\n TIME = 1083,\n TIMESTAMP = 1114,\n TIMESTAMPTZ = 1184,\n INTERVAL = 1186,\n TIMETZ = 1266,\n BIT = 1560,\n VARBIT = 1562,\n NUMERIC = 1700,\n REFCURSOR = 1790,\n REGPROCEDURE = 2202,\n REGOPER = 2203,\n REGOPERATOR = 2204,\n REGCLASS = 2205,\n REGTYPE = 2206,\n UUID = 2950,\n TXID_SNAPSHOT = 2970,\n PG_LSN = 3220,\n PG_NDISTINCT = 3361,\n PG_DEPENDENCIES = 3402,\n TSVECTOR = 3614,\n TSQUERY = 3615,\n GTSVECTOR = 3642,\n REGCONFIG = 3734,\n REGDICTIONARY = 3769,\n JSONB = 3802,\n REGNAMESPACE = 4089,\n REGROLE = 4096\n\nexport const types = {\n string: {\n to: TEXT,\n from: [TEXT, VARCHAR, BPCHAR],\n serialize: (x: string | number) => {\n if (typeof x === 'string') {\n return x\n } else if (typeof x === 'number') {\n return x.toString()\n } else {\n throw new Error('Invalid input for string type')\n }\n },\n parse: (x: string) => x,\n },\n number: {\n to: 0,\n from: [INT2, INT4, OID, FLOAT4, FLOAT8],\n serialize: (x: number) => x.toString(),\n parse: (x: string) => +x,\n },\n bigint: {\n to: INT8,\n from: [INT8],\n serialize: (x: bigint) => x.toString(),\n parse: (x: string) => {\n const n = BigInt(x)\n if (n < Number.MIN_SAFE_INTEGER || n > Number.MAX_SAFE_INTEGER) {\n return n // return BigInt\n } else {\n return Number(n) // in range of standard JS numbers so return number\n }\n },\n },\n json: {\n to: JSON,\n from: [JSON, JSONB],\n serialize: (x: any) => {\n if (typeof x === 'string') {\n return x\n } else {\n return JSON_stringify(x)\n }\n },\n parse: (x: string) => JSON_parse(x),\n },\n boolean: {\n to: BOOL,\n from: [BOOL],\n serialize: (x: boolean) => {\n if (typeof x !== 'boolean') {\n throw new Error('Invalid input for boolean type')\n }\n return x ? 't' : 'f'\n },\n parse: (x: string) => x === 't',\n },\n date: {\n to: TIMESTAMPTZ,\n from: [DATE, TIMESTAMP, TIMESTAMPTZ],\n serialize: (x: Date | string | number) => {\n if (typeof x === 'string') {\n return x\n } else if (typeof x === 'number') {\n return new Date(x).toISOString()\n } else if (x instanceof Date) {\n return x.toISOString()\n } else {\n throw new Error('Invalid input for date type')\n }\n },\n parse: (x: string | number) => new Date(x),\n },\n bytea: {\n to: BYTEA,\n from: [BYTEA],\n serialize: (x: Uint8Array) => {\n if (!(x instanceof Uint8Array)) {\n throw new Error('Invalid input for bytea type')\n }\n return (\n '\\\\x' +\n Array.from(x)\n .map((byte) => byte.toString(16).padStart(2, '0'))\n .join('')\n )\n },\n parse: (x: string): Uint8Array => {\n const hexString = x.slice(2)\n return Uint8Array.from({ length: hexString.length / 2 }, (_, idx) =>\n parseInt(hexString.substring(idx * 2, (idx + 1) * 2), 16),\n )\n },\n },\n} satisfies TypeHandlers\n\nexport type Parser = (x: string, typeId?: number) => any\nexport type Serializer = (x: any) => string\n\nexport type TypeHandler = {\n to: number\n from: number | number[]\n serialize: Serializer\n parse: Parser\n}\n\nexport type TypeHandlers = {\n [key: string]: TypeHandler\n}\n\nconst defaultHandlers = typeHandlers(types)\n\nexport const parsers = defaultHandlers.parsers\nexport const serializers = defaultHandlers.serializers\n\nexport function parseType(\n x: string | null,\n type: number,\n parsers?: ParserOptions,\n): any {\n if (x === null) {\n return null\n }\n const handler = parsers?.[type] ?? defaultHandlers.parsers[type]\n if (handler) {\n return handler(x, type)\n } else {\n return x\n }\n}\n\nfunction typeHandlers(types: TypeHandlers) {\n return Object.keys(types).reduce(\n ({ parsers, serializers }, k) => {\n const { to, from, serialize, parse } = types[k]\n serializers[to] = serialize\n serializers[k] = serialize\n parsers[k] = parse\n if (Array.isArray(from)) {\n from.forEach((f) => {\n parsers[f] = parse\n serializers[f] = serialize\n })\n } else {\n parsers[from] = parse\n serializers[from] = serialize\n }\n return { parsers, serializers }\n },\n {\n parsers: {} as {\n [key: number | string]: (x: string, typeId?: number) => any\n },\n serializers: {} as {\n [key: number | string]: Serializer\n },\n },\n )\n}\n\nconst escapeBackslash = /\\\\/g\nconst escapeQuote = /\"/g\n\nfunction arrayEscape(x: string) {\n return x.replace(escapeBackslash, '\\\\\\\\').replace(escapeQuote, '\\\\\"')\n}\n\nexport function arraySerializer(\n xs: any,\n serializer: Serializer | undefined,\n typarray: number,\n): string {\n if (Array.isArray(xs) === false) return xs\n\n if (!xs.length) return '{}'\n\n const first = xs[0]\n // Only _box (1020) has the ';' delimiter for arrays, all other types use the ',' delimiter\n const delimiter = typarray === 1020 ? ';' : ','\n\n if (Array.isArray(first)) {\n return `{${xs.map((x) => arraySerializer(x, serializer, typarray)).join(delimiter)}}`\n } else {\n return `{${xs\n .map((x) => {\n if (x === undefined) {\n x = null\n // TODO: Add an option to specify how to handle undefined values\n }\n return x === null\n ? 'null'\n : '\"' + arrayEscape(serializer ? serializer(x) : x.toString()) + '\"'\n })\n .join(delimiter)}}`\n }\n}\n\nconst arrayParserState = {\n i: 0,\n char: null as string | null,\n str: '',\n quoted: false,\n last: 0,\n p: null as string | null,\n}\n\nexport function arrayParser(x: string, parser: Parser, typarray: number) {\n arrayParserState.i = arrayParserState.last = 0\n return arrayParserLoop(arrayParserState, x, parser, typarray)[0]\n}\n\nfunction arrayParserLoop(\n s: typeof arrayParserState,\n x: string,\n parser: Parser | undefined,\n typarray: number,\n): any[] {\n const xs = []\n // Only _box (1020) has the ';' delimiter for arrays, all other types use the ',' delimiter\n const delimiter = typarray === 1020 ? ';' : ','\n for (; s.i < x.length; s.i++) {\n s.char = x[s.i]\n if (s.quoted) {\n if (s.char === '\\\\') {\n s.str += x[++s.i]\n } else if (s.char === '\"') {\n xs.push(parser ? parser(s.str) : s.str)\n s.str = ''\n s.quoted = x[s.i + 1] === '\"'\n s.last = s.i + 2\n } else {\n s.str += s.char\n }\n } else if (s.char === '\"') {\n s.quoted = true\n } else if (s.char === '{') {\n s.last = ++s.i\n xs.push(arrayParserLoop(s, x, parser, typarray))\n } else if (s.char === '}') {\n s.quoted = false\n s.last < s.i &&\n xs.push(parser ? parser(x.slice(s.last, s.i)) : x.slice(s.last, s.i))\n s.last = s.i + 1\n break\n } else if (s.char === delimiter && s.p !== '}' && s.p !== '\"') {\n xs.push(parser ? parser(x.slice(s.last, s.i)) : x.slice(s.last, s.i))\n s.last = s.i + 1\n }\n s.p = s.char\n }\n s.last < s.i &&\n xs.push(\n parser ? parser(x.slice(s.last, s.i + 1)) : x.slice(s.last, s.i + 1),\n )\n return xs\n}\n","import {\n BackendMessage,\n RowDescriptionMessage,\n DataRowMessage,\n CommandCompleteMessage,\n ParameterDescriptionMessage,\n} from '@electric-sql/pg-protocol/messages'\nimport type { Results, QueryOptions } from './interface.js'\nimport { parseType, type Parser } from './types.js'\n\n/**\n * This function is used to parse the results of either a simple or extended query.\n * https://www.postgresql.org/docs/current/protocol-flow.html#PROTOCOL-FLOW-SIMPLE-QUERY\n */\nexport function parseResults(\n messages: Array<BackendMessage>,\n defaultParsers: Record<number | string, Parser>,\n options?: QueryOptions,\n blob?: Blob,\n): Array<Results> {\n const resultSets: Results[] = []\n let currentResultSet: Results = { rows: [], fields: [] }\n let affectedRows = 0\n const parsers = { ...defaultParsers, ...options?.parsers }\n\n messages.forEach((message) => {\n switch (message.name) {\n case 'rowDescription': {\n const msg = message as RowDescriptionMessage\n currentResultSet.fields = msg.fields.map((field) => ({\n name: field.name,\n dataTypeID: field.dataTypeID,\n }))\n break\n }\n case 'dataRow': {\n if (!currentResultSet) break\n const msg = message as DataRowMessage\n if (options?.rowMode === 'array') {\n currentResultSet.rows.push(\n msg.fields.map((field, i) =>\n parseType(field, currentResultSet!.fields[i].dataTypeID, parsers),\n ),\n )\n } else {\n // rowMode === \"object\"\n currentResultSet.rows.push(\n Object.fromEntries(\n msg.fields.map((field, i) => [\n currentResultSet!.fields[i].name,\n parseType(\n field,\n currentResultSet!.fields[i].dataTypeID,\n parsers,\n ),\n ]),\n ),\n )\n }\n break\n }\n case 'commandComplete': {\n const msg = message as CommandCompleteMessage\n affectedRows += retrieveRowCount(msg)\n\n resultSets.push({\n ...currentResultSet,\n affectedRows,\n ...(blob ? { blob } : {}),\n })\n\n currentResultSet = { rows: [], fields: [] }\n break\n }\n }\n })\n\n if (resultSets.length === 0) {\n resultSets.push({\n affectedRows: 0,\n rows: [],\n fields: [],\n })\n }\n\n return resultSets\n}\n\nfunction retrieveRowCount(msg: CommandCompleteMessage): number {\n const parts = msg.text.split(' ')\n switch (parts[0]) {\n case 'INSERT':\n return parseInt(parts[2], 10)\n case 'UPDATE':\n case 'DELETE':\n case 'COPY':\n case 'MERGE':\n return parseInt(parts[1], 10)\n default:\n return 0\n }\n}\n\n/** Get the dataTypeIDs from a list of messages, if it's available. */\nexport function parseDescribeStatementResults(\n messages: Array<BackendMessage>,\n): number[] {\n const message = messages.find(\n (msg): msg is ParameterDescriptionMessage =>\n msg.name === 'parameterDescription',\n )\n\n if (message) {\n return message.dataTypeIDs\n }\n\n return []\n}\n","import type { PGliteInterface, Transaction } from './interface.js'\nimport { serialize as serializeProtocol } from '@electric-sql/pg-protocol'\nimport { parseDescribeStatementResults } from './parse.js'\nimport { TEXT } from './types.js'\n\nexport const IN_NODE =\n typeof process === 'object' &&\n typeof process.versions === 'object' &&\n typeof process.versions.node === 'string'\n\nlet wasmDownloadPromise: Promise<Response> | undefined\n\nexport async function startWasmDownload() {\n if (IN_NODE || wasmDownloadPromise) {\n return\n }\n const moduleUrl = new URL('../release/pglite.wasm', import.meta.url)\n wasmDownloadPromise = fetch(moduleUrl)\n}\n\n// This is a global cache of the PGlite Wasm module to avoid having to re-download or\n// compile it on subsequent calls.\nlet cachedWasmModule: WebAssembly.Module | undefined\n\nexport async function instantiateWasm(\n imports: WebAssembly.Imports,\n module?: WebAssembly.Module,\n): Promise<{\n instance: WebAssembly.Instance\n module: WebAssembly.Module\n}> {\n if (module || cachedWasmModule) {\n return {\n instance: await WebAssembly.instantiate(\n module || cachedWasmModule!,\n imports,\n ),\n module: module || cachedWasmModule!,\n }\n }\n const moduleUrl = new URL('../release/pglite.wasm', import.meta.url)\n if (IN_NODE) {\n const fs = await import('fs/promises')\n const buffer = await fs.readFile(moduleUrl)\n const { module: newModule, instance } = await WebAssembly.instantiate(\n buffer,\n imports,\n )\n cachedWasmModule = newModule\n return {\n instance,\n module: newModule,\n }\n } else {\n if (!wasmDownloadPromise) {\n wasmDownloadPromise = fetch(moduleUrl)\n }\n const response = await wasmDownloadPromise\n const { module: newModule, instance } =\n await WebAssembly.instantiateStreaming(response, imports)\n cachedWasmModule = newModule\n return {\n instance,\n module: newModule,\n }\n }\n}\n\nexport async function getFsBundle(): Promise<ArrayBuffer> {\n const fsBundleUrl = new URL('../release/pglite.data', import.meta.url)\n if (IN_NODE) {\n const fs = await import('fs/promises')\n const fileData = await fs.readFile(fsBundleUrl)\n return fileData.buffer\n } else {\n const response = await fetch(fsBundleUrl)\n return response.arrayBuffer()\n }\n}\n\nexport const uuid = (): string => {\n // best case, `crypto.randomUUID` is available\n if (globalThis.crypto?.randomUUID) {\n return globalThis.crypto.randomUUID()\n }\n\n const bytes = new Uint8Array(16)\n\n if (globalThis.crypto?.getRandomValues) {\n // `crypto.getRandomValues` is available even in non-secure contexts\n globalThis.crypto.getRandomValues(bytes)\n } else {\n // fallback to Math.random, if the Crypto API is completely missing\n for (let i = 0; i < bytes.length; i++) {\n bytes[i] = Math.floor(Math.random() * 256)\n }\n }\n\n bytes[6] = (bytes[6] & 0x0f) | 0x40 // Set the 4 most significant bits to 0100\n bytes[8] = (bytes[8] & 0x3f) | 0x80 // Set the 2 most significant bits to 10\n\n const hexValues: string[] = []\n bytes.forEach((byte) => {\n hexValues.push(byte.toString(16).padStart(2, '0'))\n })\n\n return (\n hexValues.slice(0, 4).join('') +\n '-' +\n hexValues.slice(4, 6).join('') +\n '-' +\n hexValues.slice(6, 8).join('') +\n '-' +\n hexValues.slice(8, 10).join('') +\n '-' +\n hexValues.slice(10).join('')\n )\n}\n\n/**\n * Formats a query with parameters\n * Expects that any tables/relations referenced in the query exist in the database\n * due to requiring them to be present to describe the parameters types.\n * `tx` is optional, and to be used when formatQuery is called during a transaction.\n * @param pg - The PGlite instance\n * @param query - The query to format\n * @param params - The parameters to format the query with\n * @param tx - The transaction to use, defaults to the PGlite instance\n * @returns The formatted query\n */\nexport async function formatQuery(\n pg: PGliteInterface,\n query: string,\n params?: any[] | null,\n tx?: Transaction | PGliteInterface,\n) {\n if (!params || params.length === 0) {\n // no params so no formatting needed\n return query\n }\n\n tx = tx ?? pg\n\n // Get the types of the parameters\n const messages = []\n try {\n await pg.execProtocol(serializeProtocol.parse({ text: query }), {\n syncToFs: false,\n })\n\n messages.push(\n ...(\n await pg.execProtocol(serializeProtocol.describe({ type: 'S' }), {\n syncToFs: false,\n })\n ).messages,\n )\n } finally {\n messages.push(\n ...(await pg.execProtocol(serializeProtocol.sync(), { syncToFs: false }))\n .messages,\n )\n }\n\n const dataTypeIDs = parseDescribeStatementResults(messages)\n\n // replace $1, $2, etc with %1L, %2L, etc\n const subbedQuery = query.replace(/\\$([0-9]+)/g, (_, num) => {\n return '%' + num + 'L'\n })\n\n const ret = await tx.query<{\n query: string\n }>(\n `SELECT format($1, ${params.map((_, i) => `$${i + 2}`).join(', ')}) as query`,\n [subbedQuery, ...params],\n { paramTypes: [TEXT, ...dataTypeIDs] },\n )\n return ret.rows[0].query\n}\n\n/**\n * Debounce a function to ensure that only one instance of the function is running at\n * a time.\n * - If the function is called while an instance is already running, the new\n * call is scheduled to run after the current instance completes.\n * - If there is already a scheduled call, it is replaced with the new call.\n * @param fn - The function to debounce\n * @returns A debounced version of the function\n */\nexport function debounceMutex<A extends any[], R>(\n fn: (...args: A) => Promise<R>,\n): (...args: A) => Promise<R | void> {\n let next:\n | {\n args: A\n resolve: (value: R | void) => void\n reject: (reason?: any) => void\n }\n | undefined = undefined\n\n let isRunning = false\n const processNext = async () => {\n if (!next) {\n isRunning = false\n return\n }\n isRunning = true\n const { args, resolve, reject } = next\n next = undefined\n try {\n const ret = await fn(...args)\n resolve(ret)\n } catch (e) {\n reject(e)\n } finally {\n processNext()\n }\n }\n return async (...args: A) => {\n if (next) {\n next.resolve(undefined)\n }\n const promise = new Promise<R | void>((resolve, reject) => {\n next = { args, resolve, reject }\n })\n if (!isRunning) {\n processNext()\n }\n return promise\n }\n}\n\n/**\n * Postgresql handles quoted names as CaseSensitive and unquoted as lower case.\n * If input is quoted, returns an unquoted string (same casing)\n * If input is unquoted, returns a lower-case string\n */\nexport function toPostgresName(input: string): string {\n let output\n if (input.startsWith('\"') && input.endsWith('\"')) {\n // Postgres sensitive case\n output = input.substring(1, input.length - 1)\n } else {\n // Postgres case insensitive - all to lower\n output = input.toLowerCase()\n }\n return 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