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import * as hrana from "@libsql/hrana-client";
import { LibsqlError } from "@libsql/core/api";
import { expandConfig } from "@libsql/core/config";
import { HranaTransaction, executeHranaBatch, stmtToHrana, resultSetFromHrana, mapHranaError, } from "./hrana.js";
import { SqlCache } from "./sql_cache.js";
import { encodeBaseUrl } from "@libsql/core/uri";
import { supportedUrlLink } from "@libsql/core/util";
import promiseLimit from "promise-limit";
export * from "@libsql/core/api";
export function createClient(config) {
return _createClient(expandConfig(config, false));
}
/** @private */
export function _createClient(config) {
if (config.scheme !== "wss" && config.scheme !== "ws") {
throw new LibsqlError('The WebSocket client supports only "libsql:", "wss:" and "ws:" URLs, ' +
`got ${JSON.stringify(config.scheme + ":")}. For more information, please read ${supportedUrlLink}`, "URL_SCHEME_NOT_SUPPORTED");
}
if (config.encryptionKey !== undefined) {
throw new LibsqlError("Encryption key is not supported by the remote client.", "ENCRYPTION_KEY_NOT_SUPPORTED");
}
if (config.scheme === "ws" && config.tls) {
throw new LibsqlError(`A "ws:" URL cannot opt into TLS by using ?tls=1`, "URL_INVALID");
}
else if (config.scheme === "wss" && !config.tls) {
throw new LibsqlError(`A "wss:" URL cannot opt out of TLS by using ?tls=0`, "URL_INVALID");
}
const url = encodeBaseUrl(config.scheme, config.authority, config.path);
let client;
try {
client = hrana.openWs(url, config.authToken);
}
catch (e) {
if (e instanceof hrana.WebSocketUnsupportedError) {
const suggestedScheme = config.scheme === "wss" ? "https" : "http";
const suggestedUrl = encodeBaseUrl(suggestedScheme, config.authority, config.path);
throw new LibsqlError("This environment does not support WebSockets, please switch to the HTTP client by using " +
`a "${suggestedScheme}:" URL (${JSON.stringify(suggestedUrl)}). ` +
`For more information, please read ${supportedUrlLink}`, "WEBSOCKETS_NOT_SUPPORTED");
}
throw mapHranaError(e);
}
return new WsClient(client, url, config.authToken, config.intMode, config.concurrency);
}
const maxConnAgeMillis = 60 * 1000;
const sqlCacheCapacity = 100;
export class WsClient {
#url;
#authToken;
#intMode;
// State of the current connection. The `hrana.WsClient` inside may be closed at any moment due to an
// asynchronous error.
#connState;
// If defined, this is a connection that will be used in the future, once it is ready.
#futureConnState;
closed;
protocol;
#isSchemaDatabase;
#promiseLimitFunction;
/** @private */
constructor(client, url, authToken, intMode, concurrency) {
this.#url = url;
this.#authToken = authToken;
this.#intMode = intMode;
this.#connState = this.#openConn(client);
this.#futureConnState = undefined;
this.closed = false;
this.protocol = "ws";
this.#promiseLimitFunction = promiseLimit(concurrency);
}
async limit(fn) {
return this.#promiseLimitFunction(fn);
}
async execute(stmtOrSql, args) {
let stmt;
if (typeof stmtOrSql === 'string') {
stmt = {
sql: stmtOrSql,
args: args || []
};
}
else {
stmt = stmtOrSql;
}
return this.limit(async () => {
const streamState = await this.#openStream();
try {
const hranaStmt = stmtToHrana(stmt);
// Schedule all operations synchronously, so they will be pipelined and executed in a single
// network roundtrip.
streamState.conn.sqlCache.apply([hranaStmt]);
const hranaRowsPromise = streamState.stream.query(hranaStmt);
streamState.stream.closeGracefully();
const hranaRowsResult = await hranaRowsPromise;
return resultSetFromHrana(hranaRowsResult);
}
catch (e) {
throw mapHranaError(e);
}
finally {
this._closeStream(streamState);
}
});
}
async batch(stmts, mode = "deferred") {
return this.limit(async () => {
const streamState = await this.#openStream();
try {
const hranaStmts = stmts.map(stmtToHrana);
const version = await streamState.conn.client.getVersion();
// Schedule all operations synchronously, so they will be pipelined and executed in a single
// network roundtrip.
streamState.conn.sqlCache.apply(hranaStmts);
const batch = streamState.stream.batch(version >= 3);
const resultsPromise = executeHranaBatch(mode, version, batch, hranaStmts);
const results = await resultsPromise;
return results;
}
catch (e) {
throw mapHranaError(e);
}
finally {
this._closeStream(streamState);
}
});
}
async transaction(mode = "write") {
return this.limit(async () => {
const streamState = await this.#openStream();
try {
const version = await streamState.conn.client.getVersion();
// the BEGIN statement will be batched with the first statement on the transaction to save a
// network roundtrip
return new WsTransaction(this, streamState, mode, version);
}
catch (e) {
this._closeStream(streamState);
throw mapHranaError(e);
}
});
}
async executeMultiple(sql) {
return this.limit(async () => {
const streamState = await this.#openStream();
try {
// Schedule all operations synchronously, so they will be pipelined and executed in a single
// network roundtrip.
const promise = streamState.stream.sequence(sql);
streamState.stream.closeGracefully();
await promise;
}
catch (e) {
throw mapHranaError(e);
}
finally {
this._closeStream(streamState);
}
});
}
sync() {
return Promise.resolve();
}
async #openStream() {
if (this.closed) {
throw new LibsqlError("The client is closed", "CLIENT_CLOSED");
}
const now = new Date();
const ageMillis = now.valueOf() - this.#connState.openTime.valueOf();
if (ageMillis > maxConnAgeMillis &&
this.#futureConnState === undefined) {
// The existing connection is too old, let's open a new one.
const futureConnState = this.#openConn();
this.#futureConnState = futureConnState;
// However, if we used `futureConnState` immediately, we would introduce additional latency,
// because we would have to wait for the WebSocket handshake to complete, even though we may a
// have perfectly good existing connection in `this.#connState`!
//
// So we wait until the `hrana.Client.getVersion()` operation completes (which happens when the
// WebSocket hanshake completes), and only then we replace `this.#connState` with
// `futureConnState`, which is stored in `this.#futureConnState` in the meantime.
futureConnState.client.getVersion().then((_version) => {
if (this.#connState !== futureConnState) {
// We need to close `this.#connState` before we replace it. However, it is possible
// that `this.#connState` has already been replaced: see the code below.
if (this.#connState.streamStates.size === 0) {
this.#connState.client.close();
}
else {
// If there are existing streams on the connection, we must not close it, because
// these streams would be broken. The last stream to be closed will also close the
// connection in `_closeStream()`.
}
}
this.#connState = futureConnState;
this.#futureConnState = undefined;
}, (_e) => {
// If the new connection could not be established, let's just ignore the error and keep
// using the existing connection.
this.#futureConnState = undefined;
});
}
if (this.#connState.client.closed) {
// An error happened on this connection and it has been closed. Let's try to seamlessly reconnect.
try {
if (this.#futureConnState !== undefined) {
// We are already in the process of opening a new connection, so let's just use it
// immediately.
this.#connState = this.#futureConnState;
}
else {
this.#connState = this.#openConn();
}
}
catch (e) {
throw mapHranaError(e);
}
}
const connState = this.#connState;
try {
// Now we wait for the WebSocket handshake to complete (if it hasn't completed yet). Note that
// this does not increase latency, because any messages that we would send on the WebSocket before
// the handshake would be queued until the handshake is completed anyway.
if (connState.useSqlCache === undefined) {
connState.useSqlCache =
(await connState.client.getVersion()) >= 2;
if (connState.useSqlCache) {
connState.sqlCache.capacity = sqlCacheCapacity;
}
}
const stream = connState.client.openStream();
stream.intMode = this.#intMode;
const streamState = { conn: connState, stream };
connState.streamStates.add(streamState);
return streamState;
}
catch (e) {
throw mapHranaError(e);
}
}
#openConn(client) {
try {
client ??= hrana.openWs(this.#url, this.#authToken);
return {
client,
useSqlCache: undefined,
sqlCache: new SqlCache(client, 0),
openTime: new Date(),
streamStates: new Set(),
};
}
catch (e) {
throw mapHranaError(e);
}
}
_closeStream(streamState) {
streamState.stream.close();
const connState = streamState.conn;
connState.streamStates.delete(streamState);
if (connState.streamStates.size === 0 &&
connState !== this.#connState) {
// We are not using this connection anymore and this is the last stream that was using it, so we
// must close it now.
connState.client.close();
}
}
close() {
this.#connState.client.close();
this.closed = true;
}
}
export class WsTransaction extends HranaTransaction {
#client;
#streamState;
/** @private */
constructor(client, state, mode, version) {
super(mode, version);
this.#client = client;
this.#streamState = state;
}
/** @private */
_getStream() {
return this.#streamState.stream;
}
/** @private */
_getSqlCache() {
return this.#streamState.conn.sqlCache;
}
close() {
this.#client._closeStream(this.#streamState);
}
get closed() {
return this.#streamState.stream.closed;
}
}