852 lines
33 KiB
JavaScript
852 lines
33 KiB
JavaScript
/*
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2022-09-18
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The author disclaims copyright to this source code. In place of a
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legal notice, here is a blessing:
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* May you do good and not evil.
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* May you find forgiveness for yourself and forgive others.
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* May you share freely, never taking more than you give.
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***********************************************************************
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This file holds the synchronous half of an sqlite3_vfs
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implementation which proxies, in a synchronous fashion, the
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asynchronous Origin-Private FileSystem (OPFS) APIs using a second
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Worker, implemented in sqlite3-opfs-async-proxy.js. This file is
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intended to be appended to the main sqlite3 JS deliverable somewhere
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after sqlite3-api-glue.js and before sqlite3-api-cleanup.js.
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*/
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'use strict';
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self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
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/**
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sqlite3.installOpfsVfs() returns a Promise which, on success, installs
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an sqlite3_vfs named "opfs", suitable for use with all sqlite3 APIs
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which accept a VFS. It uses the Origin-Private FileSystem API for
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all file storage. On error it is rejected with an exception
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explaining the problem. Reasons for rejection include, but are
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not limited to:
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- The counterpart Worker (see below) could not be loaded.
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- The environment does not support OPFS. That includes when
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this function is called from the main window thread.
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Significant notes and limitations:
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- As of this writing, OPFS is still very much in flux and only
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available in bleeding-edge versions of Chrome (v102+, noting that
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that number will increase as the OPFS API matures).
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- The OPFS features used here are only available in dedicated Worker
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threads. This file tries to detect that case, resulting in a
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rejected Promise if those features do not seem to be available.
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- It requires the SharedArrayBuffer and Atomics classes, and the
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former is only available if the HTTP server emits the so-called
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COOP and COEP response headers. These features are required for
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proxying OPFS's synchronous API via the synchronous interface
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required by the sqlite3_vfs API.
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- This function may only be called a single time and it must be
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called from the client, as opposed to the library initialization,
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in case the client requires a custom path for this API's
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"counterpart": this function's argument is the relative URI to
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this module's "asynchronous half". When called, this function removes
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itself from the sqlite3 object.
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The argument may optionally be a plain object with the following
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configuration options:
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- proxyUri: as described above
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- verbose (=2): an integer 0-3. 0 disables all logging, 1 enables
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logging of errors. 2 enables logging of warnings and errors. 3
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additionally enables debugging info.
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- sanityChecks (=false): if true, some basic sanity tests are
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run on the OPFS VFS API after it's initialized, before the
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returned Promise resolves.
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On success, the Promise resolves to the top-most sqlite3 namespace
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object and that object gets a new object installed in its
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`opfs` property, containing several OPFS-specific utilities.
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*/
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sqlite3.installOpfsVfs = function callee(asyncProxyUri = callee.defaultProxyUri){
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delete sqlite3.installOpfsVfs;
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if(self.window===self ||
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!self.SharedArrayBuffer ||
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!self.FileSystemHandle ||
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!self.FileSystemDirectoryHandle ||
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!self.FileSystemFileHandle ||
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!self.FileSystemFileHandle.prototype.createSyncAccessHandle ||
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!navigator.storage.getDirectory){
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return Promise.reject(
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new Error("This environment does not have OPFS support.")
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);
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}
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const options = (asyncProxyUri && 'object'===asyncProxyUri) ? asyncProxyUri : {
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proxyUri: asyncProxyUri
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};
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const urlParams = new URL(self.location.href).searchParams;
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if(undefined===options.verbose){
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options.verbose = urlParams.has('opfs-verbose') ? 3 : 2;
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}
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if(undefined===options.sanityChecks){
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options.sanityChecks = urlParams.has('opfs-sanity-check');
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}
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if(undefined===options.proxyUri){
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options.proxyUri = callee.defaultProxyUri;
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}
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const thePromise = new Promise(function(promiseResolve, promiseReject){
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const loggers = {
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0:console.error.bind(console),
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1:console.warn.bind(console),
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2:console.log.bind(console)
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};
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const logImpl = (level,...args)=>{
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if(options.verbose>level) loggers[level]("OPFS syncer:",...args);
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};
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const log = (...args)=>logImpl(2, ...args);
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const warn = (...args)=>logImpl(1, ...args);
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const error = (...args)=>logImpl(0, ...args);
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warn("The OPFS VFS feature is very much experimental and under construction.");
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const toss = function(...args){throw new Error(args.join(' '))};
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const capi = sqlite3.capi;
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const wasm = capi.wasm;
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const sqlite3_vfs = capi.sqlite3_vfs;
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const sqlite3_file = capi.sqlite3_file;
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const sqlite3_io_methods = capi.sqlite3_io_methods;
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const W = new Worker(options.proxyUri);
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W._originalOnError = W.onerror /* will be restored later */;
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W.onerror = function(err){
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// The error object doesn't contain any useful info when the
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// failure is, e.g., that the remote script is 404.
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promiseReject(new Error("Loading OPFS async Worker failed for unknown reasons."));
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};
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const wMsg = (type,args)=>W.postMessage({type,args});
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/**
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Generic utilities for working with OPFS. This will get filled out
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by the Promise setup and, on success, installed as sqlite3.opfs.
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*/
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const opfsUtil = Object.create(null);
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/**
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Not part of the public API. Solely for internal/development
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use.
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*/
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opfsUtil.metrics = {
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dump: function(){
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let k, n = 0, t = 0, w = 0;
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for(k in state.opIds){
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const m = metrics[k];
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n += m.count;
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t += m.time;
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w += m.wait;
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m.avgTime = (m.count && m.time) ? (m.time / m.count) : 0;
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m.avgWait = (m.count && m.wait) ? (m.wait / m.count) : 0;
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}
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console.log(self.location.href,
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"metrics for",self.location.href,":",metrics,
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"\nTotal of",n,"op(s) for",t,
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"ms (incl. "+w+" ms of waiting on the async side)");
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},
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reset: function(){
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let k;
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const r = (m)=>(m.count = m.time = m.wait = 0);
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for(k in state.opIds){
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r(metrics[k] = Object.create(null));
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}
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//[ // timed routines which are not in state.opIds
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// 'xFileControl'
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//].forEach((k)=>r(metrics[k] = Object.create(null)));
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}
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}/*metrics*/;
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/**
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State which we send to the async-api Worker or share with it.
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This object must initially contain only cloneable or sharable
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objects. After the worker's "inited" message arrives, other types
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of data may be added to it.
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For purposes of Atomics.wait() and Atomics.notify(), we use a
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SharedArrayBuffer with one slot reserved for each of the API
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proxy's methods. The sync side of the API uses Atomics.wait()
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on the corresponding slot and the async side uses
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Atomics.notify() on that slot.
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The approach of using a single SAB to serialize comms for all
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instances might(?) lead to deadlock situations in multi-db
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cases. We should probably have one SAB here with a single slot
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for locking a per-file initialization step and then allocate a
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separate SAB like the above one for each file. That will
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require a bit of acrobatics but should be feasible.
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*/
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const state = Object.create(null);
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state.littleEndian = true;
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state.verbose = options.verbose;
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state.fileBufferSize =
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1024 * 64 /* size of aFileHandle.sab. 64k = max sqlite3 page
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size. */;
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state.sabS11nOffset = state.fileBufferSize;
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state.sabS11nSize = 2048;
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state.sabIO = new SharedArrayBuffer(
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state.fileBufferSize
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+ state.sabS11nSize/* arg/result serialization block */
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);
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state.opIds = Object.create(null);
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state.rcIds = Object.create(null);
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const metrics = Object.create(null);
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{
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let i = 0;
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state.opIds.whichOp = i++;
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state.opIds.nothing = i++;
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state.opIds.xAccess = i++;
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state.rcIds.xAccess = i++;
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state.opIds.xClose = i++;
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state.rcIds.xClose = i++;
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state.opIds.xDelete = i++;
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state.rcIds.xDelete = i++;
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state.opIds.xDeleteNoWait = i++;
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state.rcIds.xDeleteNoWait = i++;
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state.opIds.xFileSize = i++;
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state.rcIds.xFileSize = i++;
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state.opIds.xOpen = i++;
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state.rcIds.xOpen = i++;
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state.opIds.xRead = i++;
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state.rcIds.xRead = i++;
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state.opIds.xSleep = i++;
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state.rcIds.xSleep = i++;
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state.opIds.xSync = i++;
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state.rcIds.xSync = i++;
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state.opIds.xTruncate = i++;
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state.rcIds.xTruncate = i++;
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state.opIds.xWrite = i++;
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state.rcIds.xWrite = i++;
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state.opIds.mkdir = i++;
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state.rcIds.mkdir = i++;
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state.sabOP = new SharedArrayBuffer(i * 4/*sizeof int32*/);
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state.opIds.xFileControl = state.opIds.xSync /* special case */;
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opfsUtil.metrics.reset();
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}
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state.sq3Codes = Object.create(null);
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state.sq3Codes._reverse = Object.create(null);
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[ // SQLITE_xxx constants to export to the async worker counterpart...
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'SQLITE_ERROR', 'SQLITE_IOERR',
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'SQLITE_NOTFOUND', 'SQLITE_MISUSE',
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'SQLITE_IOERR_READ', 'SQLITE_IOERR_SHORT_READ',
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'SQLITE_IOERR_WRITE', 'SQLITE_IOERR_FSYNC',
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'SQLITE_IOERR_TRUNCATE', 'SQLITE_IOERR_DELETE',
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'SQLITE_IOERR_ACCESS', 'SQLITE_IOERR_CLOSE',
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'SQLITE_IOERR_DELETE',
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'SQLITE_OPEN_CREATE', 'SQLITE_OPEN_DELETEONCLOSE',
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'SQLITE_OPEN_READONLY'
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].forEach(function(k){
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state.sq3Codes[k] = capi[k] || toss("Maintenance required: not found:",k);
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state.sq3Codes._reverse[capi[k]] = k;
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});
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const isWorkerErrCode = (n)=>!!state.sq3Codes._reverse[n];
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/**
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Runs the given operation in the async worker counterpart, waits
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for its response, and returns the result which the async worker
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writes to the given op's index in state.sabOPView. The 2nd argument
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must be a single object or primitive value, depending on the
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given operation's signature in the async API counterpart.
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*/
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const opRun = (op,...args)=>{
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const t = performance.now();
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Atomics.store(state.sabOPView, state.opIds[op], -1);
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wMsg(op, args);
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Atomics.wait(state.sabOPView, state.opIds[op], -1);
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metrics[op].wait += performance.now() - t;
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return Atomics.load(state.sabOPView, state.opIds[op]);
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};
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const initS11n = ()=>{
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// Achtung: this code is 100% duplicated in the other half of this proxy!
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if(state.s11n) return state.s11n;
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const jsonDecoder = new TextDecoder(),
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jsonEncoder = new TextEncoder('utf-8'),
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viewSz = new DataView(state.sabIO, state.sabS11nOffset, 4),
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viewJson = new Uint8Array(state.sabIO, state.sabS11nOffset+4, state.sabS11nSize-4);
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state.s11n = Object.create(null);
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/**
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Returns an array of the state serialized by the most recent
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serialize() operation (here or in the counterpart thread), or
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null if the serialization buffer is empty.
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*/
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state.s11n.deserialize = function(){
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const sz = viewSz.getInt32(0, state.littleEndian);
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const json = sz ? jsonDecoder.decode(
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viewJson.slice(0, sz)
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/* slice() (copy) needed, instead of subarray() (reference),
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because TextDecoder throws if asked to decode from an
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SAB. */
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) : null;
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return JSON.parse(json);
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}
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/**
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Serializes all arguments to the shared buffer for consumption
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by the counterpart thread. This impl currently uses JSON for
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serialization for simplicy of implementation, but if that
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proves imperformant then a lower-level approach will be
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created.
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*/
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state.s11n.serialize = function(...args){
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const json = jsonEncoder.encode(JSON.stringify(args));
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viewSz.setInt32(0, json.byteLength, state.littleEndian);
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viewJson.set(json);
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};
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return state.s11n;
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};
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/**
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Generates a random ASCII string len characters long, intended for
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use as a temporary file name.
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*/
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const randomFilename = function f(len=16){
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if(!f._chars){
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f._chars = "abcdefghijklmnopqrstuvwxyz"+
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+
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"012346789";
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f._n = f._chars.length;
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}
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const a = [];
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let i = 0;
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for( ; i < len; ++i){
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const ndx = Math.random() * (f._n * 64) % f._n | 0;
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a[i] = f._chars[ndx];
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}
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return a.join('');
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};
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/**
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Map of sqlite3_file pointers to objects constructed by xOpen().
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*/
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const __openFiles = Object.create(null);
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const pDVfs = capi.sqlite3_vfs_find(null)/*pointer to default VFS*/;
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const dVfs = pDVfs
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? new sqlite3_vfs(pDVfs)
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: null /* dVfs will be null when sqlite3 is built with
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SQLITE_OS_OTHER. Though we cannot currently handle
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that case, the hope is to eventually be able to. */;
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const opfsVfs = new sqlite3_vfs();
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const opfsIoMethods = new sqlite3_io_methods();
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opfsVfs.$iVersion = 2/*yes, two*/;
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opfsVfs.$szOsFile = capi.sqlite3_file.structInfo.sizeof;
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opfsVfs.$mxPathname = 1024/*sure, why not?*/;
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opfsVfs.$zName = wasm.allocCString("opfs");
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// All C-side memory of opfsVfs is zeroed out, but just to be explicit:
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opfsVfs.$xDlOpen = opfsVfs.$xDlError = opfsVfs.$xDlSym = opfsVfs.$xDlClose = null;
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opfsVfs.ondispose = [
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'$zName', opfsVfs.$zName,
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'cleanup default VFS wrapper', ()=>(dVfs ? dVfs.dispose() : null),
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'cleanup opfsIoMethods', ()=>opfsIoMethods.dispose()
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];
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/**
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Pedantic sidebar about opfsVfs.ondispose: the entries in that array
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are items to clean up when opfsVfs.dispose() is called, but in this
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environment it will never be called. The VFS instance simply
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hangs around until the WASM module instance is cleaned up. We
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"could" _hypothetically_ clean it up by "importing" an
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sqlite3_os_end() impl into the wasm build, but the shutdown order
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of the wasm engine and the JS one are undefined so there is no
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guaranty that the opfsVfs instance would be available in one
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environment or the other when sqlite3_os_end() is called (_if_ it
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gets called at all in a wasm build, which is undefined).
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*/
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/**
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Installs a StructBinder-bound function pointer member of the
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given name and function in the given StructType target object.
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It creates a WASM proxy for the given function and arranges for
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that proxy to be cleaned up when tgt.dispose() is called. Throws
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on the slightest hint of error (e.g. tgt is-not-a StructType,
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name does not map to a struct-bound member, etc.).
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Returns a proxy for this function which is bound to tgt and takes
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2 args (name,func). That function returns the same thing,
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permitting calls to be chained.
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If called with only 1 arg, it has no side effects but returns a
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func with the same signature as described above.
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*/
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const installMethod = function callee(tgt, name, func){
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if(!(tgt instanceof sqlite3.StructBinder.StructType)){
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toss("Usage error: target object is-not-a StructType.");
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}
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if(1===arguments.length){
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return (n,f)=>callee(tgt,n,f);
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}
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if(!callee.argcProxy){
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callee.argcProxy = function(func,sig){
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return function(...args){
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if(func.length!==arguments.length){
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toss("Argument mismatch. Native signature is:",sig);
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}
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return func.apply(this, args);
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}
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};
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callee.removeFuncList = function(){
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if(this.ondispose.__removeFuncList){
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this.ondispose.__removeFuncList.forEach(
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(v,ndx)=>{
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if('number'===typeof v){
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try{wasm.uninstallFunction(v)}
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catch(e){/*ignore*/}
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}
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/* else it's a descriptive label for the next number in
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the list. */
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}
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);
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delete this.ondispose.__removeFuncList;
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}
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};
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}/*static init*/
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const sigN = tgt.memberSignature(name);
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if(sigN.length<2){
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toss("Member",name," is not a function pointer. Signature =",sigN);
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}
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const memKey = tgt.memberKey(name);
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//log("installMethod",tgt, name, sigN);
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const fProxy = 1
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// We can remove this proxy middle-man once the VFS is working
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? callee.argcProxy(func, sigN)
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: func;
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const pFunc = wasm.installFunction(fProxy, tgt.memberSignature(name, true));
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tgt[memKey] = pFunc;
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if(!tgt.ondispose) tgt.ondispose = [];
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if(!tgt.ondispose.__removeFuncList){
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tgt.ondispose.push('ondispose.__removeFuncList handler',
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callee.removeFuncList);
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tgt.ondispose.__removeFuncList = [];
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}
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tgt.ondispose.__removeFuncList.push(memKey, pFunc);
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return (n,f)=>callee(tgt, n, f);
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}/*installMethod*/;
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const opTimer = Object.create(null);
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opTimer.op = undefined;
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opTimer.start = undefined;
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const mTimeStart = (op)=>{
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opTimer.start = performance.now();
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opTimer.op = op;
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//metrics[op] || toss("Maintenance required: missing metrics for",op);
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++metrics[op].count;
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};
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const mTimeEnd = ()=>(
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metrics[opTimer.op].time += performance.now() - opTimer.start
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);
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/**
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Impls for the sqlite3_io_methods methods. Maintenance reminder:
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members are in alphabetical order to simplify finding them.
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*/
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const ioSyncWrappers = {
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xCheckReservedLock: function(pFile,pOut){
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// Exclusive lock is automatically acquired when opened
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//warn("xCheckReservedLock(",arguments,") is a no-op");
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wasm.setMemValue(pOut,1,'i32');
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return 0;
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},
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xClose: function(pFile){
|
|
mTimeStart('xClose');
|
|
let rc = 0;
|
|
const f = __openFiles[pFile];
|
|
if(f){
|
|
delete __openFiles[pFile];
|
|
rc = opRun('xClose', pFile);
|
|
if(f.sq3File) f.sq3File.dispose();
|
|
}
|
|
mTimeEnd();
|
|
return rc;
|
|
},
|
|
xDeviceCharacteristics: function(pFile){
|
|
//debug("xDeviceCharacteristics(",pFile,")");
|
|
return capi.SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN;
|
|
},
|
|
xFileControl: function(pFile, opId, pArg){
|
|
mTimeStart('xFileControl');
|
|
const rc = (capi.SQLITE_FCNTL_SYNC===opId)
|
|
? opRun('xSync', pFile, 0)
|
|
: capi.SQLITE_NOTFOUND;
|
|
mTimeEnd();
|
|
return rc;
|
|
},
|
|
xFileSize: function(pFile,pSz64){
|
|
mTimeStart('xFileSize');
|
|
const rc = opRun('xFileSize', pFile);
|
|
if(!isWorkerErrCode(rc)){
|
|
const sz = state.s11n.deserialize()[0];
|
|
wasm.setMemValue(pSz64, BigInt(sz), 'i64');
|
|
}
|
|
mTimeEnd();
|
|
return rc;
|
|
},
|
|
xLock: function(pFile,lockType){
|
|
//2022-09: OPFS handles lock when opened
|
|
//warn("xLock(",arguments,") is a no-op");
|
|
return 0;
|
|
},
|
|
xRead: function(pFile,pDest,n,offset64){
|
|
/* int (*xRead)(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst) */
|
|
mTimeStart('xRead');
|
|
const f = __openFiles[pFile];
|
|
let rc;
|
|
try {
|
|
rc = opRun('xRead',pFile, n, Number(offset64));
|
|
if(0===rc || capi.SQLITE_IOERR_SHORT_READ===rc){
|
|
// set() seems to be the fastest way to copy this...
|
|
wasm.heap8u().set(f.sabView.subarray(0, n), pDest);
|
|
}
|
|
}catch(e){
|
|
error("xRead(",arguments,") failed:",e,f);
|
|
rc = capi.SQLITE_IOERR_READ;
|
|
}
|
|
mTimeEnd();
|
|
return rc;
|
|
},
|
|
xSync: function(pFile,flags){
|
|
++metrics.xSync.count;
|
|
return 0; // impl'd in xFileControl()
|
|
},
|
|
xTruncate: function(pFile,sz64){
|
|
mTimeStart('xTruncate');
|
|
const rc = opRun('xTruncate', pFile, Number(sz64));
|
|
mTimeEnd();
|
|
return rc;
|
|
},
|
|
xUnlock: function(pFile,lockType){
|
|
//2022-09: OPFS handles lock when opened
|
|
//warn("xUnlock(",arguments,") is a no-op");
|
|
return 0;
|
|
},
|
|
xWrite: function(pFile,pSrc,n,offset64){
|
|
/* int (*xWrite)(sqlite3_file*, const void*, int iAmt, sqlite3_int64 iOfst) */
|
|
mTimeStart('xWrite');
|
|
const f = __openFiles[pFile];
|
|
let rc;
|
|
try {
|
|
f.sabView.set(wasm.heap8u().subarray(pSrc, pSrc+n));
|
|
rc = opRun('xWrite', pFile, n, Number(offset64));
|
|
}catch(e){
|
|
error("xWrite(",arguments,") failed:",e,f);
|
|
rc = capi.SQLITE_IOERR_WRITE;
|
|
}
|
|
mTimeEnd();
|
|
return rc;
|
|
}
|
|
}/*ioSyncWrappers*/;
|
|
|
|
/**
|
|
Impls for the sqlite3_vfs methods. Maintenance reminder: members
|
|
are in alphabetical order to simplify finding them.
|
|
*/
|
|
const vfsSyncWrappers = {
|
|
xAccess: function(pVfs,zName,flags,pOut){
|
|
mTimeStart('xAccess');
|
|
wasm.setMemValue(
|
|
pOut, (opRun('xAccess', wasm.cstringToJs(zName)) ? 0 : 1), 'i32'
|
|
);
|
|
mTimeEnd();
|
|
return 0;
|
|
},
|
|
xCurrentTime: function(pVfs,pOut){
|
|
/* If it turns out that we need to adjust for timezone, see:
|
|
https://stackoverflow.com/a/11760121/1458521 */
|
|
wasm.setMemValue(pOut, 2440587.5 + (new Date().getTime()/86400000),
|
|
'double');
|
|
return 0;
|
|
},
|
|
xCurrentTimeInt64: function(pVfs,pOut){
|
|
// TODO: confirm that this calculation is correct
|
|
wasm.setMemValue(pOut, (2440587.5 * 86400000) + new Date().getTime(),
|
|
'i64');
|
|
return 0;
|
|
},
|
|
xDelete: function(pVfs, zName, doSyncDir){
|
|
mTimeStart('xDelete');
|
|
opRun('xDelete', wasm.cstringToJs(zName), doSyncDir, false);
|
|
/* We're ignoring errors because we cannot yet differentiate
|
|
between harmless and non-harmless failures. */
|
|
mTimeEnd();
|
|
return 0;
|
|
},
|
|
xFullPathname: function(pVfs,zName,nOut,pOut){
|
|
/* Until/unless we have some notion of "current dir"
|
|
in OPFS, simply copy zName to pOut... */
|
|
const i = wasm.cstrncpy(pOut, zName, nOut);
|
|
return i<nOut ? 0 : capi.SQLITE_CANTOPEN
|
|
/*CANTOPEN is required by the docs but SQLITE_RANGE would be a closer match*/;
|
|
},
|
|
xGetLastError: function(pVfs,nOut,pOut){
|
|
/* TODO: store exception.message values from the async
|
|
partner in a dedicated SharedArrayBuffer, noting that we'd have
|
|
to encode them... TextEncoder can do that for us. */
|
|
warn("OPFS xGetLastError() has nothing sensible to return.");
|
|
return 0;
|
|
},
|
|
//xSleep is optionally defined below
|
|
xOpen: function f(pVfs, zName, pFile, flags, pOutFlags){
|
|
mTimeStart('xOpen');
|
|
if(!f._){
|
|
f._ = {
|
|
fileTypes: {
|
|
SQLITE_OPEN_MAIN_DB: 'mainDb',
|
|
SQLITE_OPEN_MAIN_JOURNAL: 'mainJournal',
|
|
SQLITE_OPEN_TEMP_DB: 'tempDb',
|
|
SQLITE_OPEN_TEMP_JOURNAL: 'tempJournal',
|
|
SQLITE_OPEN_TRANSIENT_DB: 'transientDb',
|
|
SQLITE_OPEN_SUBJOURNAL: 'subjournal',
|
|
SQLITE_OPEN_SUPER_JOURNAL: 'superJournal',
|
|
SQLITE_OPEN_WAL: 'wal'
|
|
},
|
|
getFileType: function(filename,oflags){
|
|
const ft = f._.fileTypes;
|
|
for(let k of Object.keys(ft)){
|
|
if(oflags & capi[k]) return ft[k];
|
|
}
|
|
warn("Cannot determine fileType based on xOpen() flags for file",filename);
|
|
return '???';
|
|
}
|
|
};
|
|
}
|
|
if(0===zName){
|
|
zName = randomFilename();
|
|
}else if('number'===typeof zName){
|
|
zName = wasm.cstringToJs(zName);
|
|
}
|
|
const fh = Object.create(null);
|
|
fh.fid = pFile;
|
|
fh.filename = zName;
|
|
fh.sab = new SharedArrayBuffer(state.fileBufferSize);
|
|
fh.flags = flags;
|
|
const rc = opRun('xOpen', pFile, zName, flags);
|
|
if(!rc){
|
|
/* Recall that sqlite3_vfs::xClose() will be called, even on
|
|
error, unless pFile->pMethods is NULL. */
|
|
if(fh.readOnly){
|
|
wasm.setMemValue(pOutFlags, capi.SQLITE_OPEN_READONLY, 'i32');
|
|
}
|
|
__openFiles[pFile] = fh;
|
|
fh.sabView = state.sabFileBufView;
|
|
fh.sq3File = new sqlite3_file(pFile);
|
|
fh.sq3File.$pMethods = opfsIoMethods.pointer;
|
|
}
|
|
mTimeEnd();
|
|
return rc;
|
|
}/*xOpen()*/
|
|
}/*vfsSyncWrappers*/;
|
|
|
|
if(dVfs){
|
|
opfsVfs.$xRandomness = dVfs.$xRandomness;
|
|
opfsVfs.$xSleep = dVfs.$xSleep;
|
|
}
|
|
if(!opfsVfs.$xRandomness){
|
|
/* If the default VFS has no xRandomness(), add a basic JS impl... */
|
|
vfsSyncWrappers.xRandomness = function(pVfs, nOut, pOut){
|
|
const heap = wasm.heap8u();
|
|
let i = 0;
|
|
for(; i < nOut; ++i) heap[pOut + i] = (Math.random()*255000) & 0xFF;
|
|
return i;
|
|
};
|
|
}
|
|
if(!opfsVfs.$xSleep){
|
|
/* If we can inherit an xSleep() impl from the default VFS then
|
|
assume it's sane and use it, otherwise install a JS-based
|
|
one. */
|
|
vfsSyncWrappers.xSleep = function(pVfs,ms){
|
|
Atomics.wait(state.sabOPView, state.opIds.xSleep, 0, ms);
|
|
return 0;
|
|
};
|
|
}
|
|
|
|
/* Install the vfs/io_methods into their C-level shared instances... */
|
|
let inst = installMethod(opfsIoMethods);
|
|
for(let k of Object.keys(ioSyncWrappers)) inst(k, ioSyncWrappers[k]);
|
|
inst = installMethod(opfsVfs);
|
|
for(let k of Object.keys(vfsSyncWrappers)) inst(k, vfsSyncWrappers[k]);
|
|
|
|
/**
|
|
Syncronously deletes the given OPFS filesystem entry, ignoring
|
|
any errors. As this environment has no notion of "current
|
|
directory", the given name must be an absolute path. If the 2nd
|
|
argument is truthy, deletion is recursive (use with caution!).
|
|
|
|
Returns true if the deletion succeeded and fails if it fails,
|
|
but cannot report the nature of the failure.
|
|
*/
|
|
opfsUtil.deleteEntry = function(fsEntryName,recursive=false){
|
|
return 0===opRun('xDelete', fsEntryName, 0, recursive);
|
|
};
|
|
/**
|
|
Exactly like deleteEntry() but runs asynchronously. This is a
|
|
"fire and forget" operation: it does not return a promise
|
|
because the counterpart operation happens in another thread and
|
|
waiting on that result in a Promise would block the OPFS VFS
|
|
from acting until it completed.
|
|
*/
|
|
opfsUtil.deleteEntryAsync = function(fsEntryName,recursive=false){
|
|
wMsg('xDeleteNoWait', [fsEntryName, 0, recursive]);
|
|
};
|
|
/**
|
|
Synchronously creates the given directory name, recursively, in
|
|
the OPFS filesystem. Returns true if it succeeds or the
|
|
directory already exists, else false.
|
|
*/
|
|
opfsUtil.mkdir = async function(absDirName){
|
|
return 0===opRun('mkdir', absDirName);
|
|
};
|
|
/**
|
|
Synchronously checks whether the given OPFS filesystem exists,
|
|
returning true if it does, false if it doesn't.
|
|
*/
|
|
opfsUtil.entryExists = function(fsEntryName){
|
|
return 0===opRun('xAccess', fsEntryName);
|
|
};
|
|
|
|
/**
|
|
Generates a random ASCII string, intended for use as a
|
|
temporary file name. Its argument is the length of the string,
|
|
defaulting to 16.
|
|
*/
|
|
opfsUtil.randomFilename = randomFilename;
|
|
|
|
if(sqlite3.oo1){
|
|
opfsUtil.OpfsDb = function(...args){
|
|
const opt = sqlite3.oo1.dbCtorHelper.normalizeArgs(...args);
|
|
opt.vfs = opfsVfs.$zName;
|
|
sqlite3.oo1.dbCtorHelper.call(this, opt);
|
|
};
|
|
opfsUtil.OpfsDb.prototype = Object.create(sqlite3.oo1.DB.prototype);
|
|
}
|
|
|
|
/**
|
|
Potential TODOs:
|
|
|
|
- Expose one or both of the Worker objects via opfsUtil and
|
|
publish an interface for proxying the higher-level OPFS
|
|
features like getting a directory listing.
|
|
*/
|
|
|
|
const sanityCheck = async function(){
|
|
const scope = wasm.scopedAllocPush();
|
|
const sq3File = new sqlite3_file();
|
|
try{
|
|
const fid = sq3File.pointer;
|
|
const openFlags = capi.SQLITE_OPEN_CREATE
|
|
| capi.SQLITE_OPEN_READWRITE
|
|
//| capi.SQLITE_OPEN_DELETEONCLOSE
|
|
| capi.SQLITE_OPEN_MAIN_DB;
|
|
const pOut = wasm.scopedAlloc(8);
|
|
const dbFile = "/sanity/check/file";
|
|
const zDbFile = wasm.scopedAllocCString(dbFile);
|
|
let rc;
|
|
vfsSyncWrappers.xAccess(opfsVfs.pointer, zDbFile, 0, pOut);
|
|
rc = wasm.getMemValue(pOut,'i32');
|
|
log("xAccess(",dbFile,") exists ?=",rc);
|
|
rc = vfsSyncWrappers.xOpen(opfsVfs.pointer, zDbFile,
|
|
fid, openFlags, pOut);
|
|
log("open rc =",rc,"state.sabOPView[xOpen] =",
|
|
state.sabOPView[state.opIds.xOpen]);
|
|
if(isWorkerErrCode(rc)){
|
|
error("open failed with code",rc);
|
|
return;
|
|
}
|
|
vfsSyncWrappers.xAccess(opfsVfs.pointer, zDbFile, 0, pOut);
|
|
rc = wasm.getMemValue(pOut,'i32');
|
|
if(!rc) toss("xAccess() failed to detect file.");
|
|
rc = ioSyncWrappers.xSync(sq3File.pointer, 0);
|
|
if(rc) toss('sync failed w/ rc',rc);
|
|
rc = ioSyncWrappers.xTruncate(sq3File.pointer, 1024);
|
|
if(rc) toss('truncate failed w/ rc',rc);
|
|
wasm.setMemValue(pOut,0,'i64');
|
|
rc = ioSyncWrappers.xFileSize(sq3File.pointer, pOut);
|
|
if(rc) toss('xFileSize failed w/ rc',rc);
|
|
log("xFileSize says:",wasm.getMemValue(pOut, 'i64'));
|
|
rc = ioSyncWrappers.xWrite(sq3File.pointer, zDbFile, 10, 1);
|
|
if(rc) toss("xWrite() failed!");
|
|
const readBuf = wasm.scopedAlloc(16);
|
|
rc = ioSyncWrappers.xRead(sq3File.pointer, readBuf, 6, 2);
|
|
wasm.setMemValue(readBuf+6,0);
|
|
let jRead = wasm.cstringToJs(readBuf);
|
|
log("xRead() got:",jRead);
|
|
if("sanity"!==jRead) toss("Unexpected xRead() value.");
|
|
if(vfsSyncWrappers.xSleep){
|
|
log("xSleep()ing before close()ing...");
|
|
vfsSyncWrappers.xSleep(opfsVfs.pointer,2000);
|
|
log("waking up from xSleep()");
|
|
}
|
|
rc = ioSyncWrappers.xClose(fid);
|
|
log("xClose rc =",rc,"sabOPView =",state.sabOPView);
|
|
log("Deleting file:",dbFile);
|
|
vfsSyncWrappers.xDelete(opfsVfs.pointer, zDbFile, 0x1234);
|
|
vfsSyncWrappers.xAccess(opfsVfs.pointer, zDbFile, 0, pOut);
|
|
rc = wasm.getMemValue(pOut,'i32');
|
|
if(rc) toss("Expecting 0 from xAccess(",dbFile,") after xDelete().");
|
|
}finally{
|
|
sq3File.dispose();
|
|
wasm.scopedAllocPop(scope);
|
|
}
|
|
}/*sanityCheck()*/;
|
|
|
|
|
|
W.onmessage = function({data}){
|
|
//log("Worker.onmessage:",data);
|
|
switch(data.type){
|
|
case 'opfs-async-loaded':
|
|
/*Pass our config and shared state on to the async worker.*/
|
|
wMsg('opfs-async-init',state);
|
|
break;
|
|
case 'opfs-async-inited':{
|
|
/*Indicates that the async partner has received the 'init',
|
|
so we now know that the state object is no longer subject to
|
|
being copied by a pending postMessage() call.*/
|
|
try {
|
|
const rc = capi.sqlite3_vfs_register(opfsVfs.pointer, 0);
|
|
if(rc){
|
|
opfsVfs.dispose();
|
|
toss("sqlite3_vfs_register(OPFS) failed with rc",rc);
|
|
}
|
|
if(opfsVfs.pointer !== capi.sqlite3_vfs_find("opfs")){
|
|
toss("BUG: sqlite3_vfs_find() failed for just-installed OPFS VFS");
|
|
}
|
|
capi.sqlite3_vfs_register.addReference(opfsVfs, opfsIoMethods);
|
|
state.sabOPView = new Int32Array(state.sabOP);
|
|
state.sabFileBufView = new Uint8Array(state.sabIO, 0, state.fileBufferSize);
|
|
state.sabS11nView = new Uint8Array(state.sabIO, state.sabS11nOffset, state.sabS11nSize);
|
|
initS11n();
|
|
if(options.sanityChecks){
|
|
warn("Running sanity checks because of opfs-sanity-check URL arg...");
|
|
sanityCheck();
|
|
}
|
|
W.onerror = W._originalOnError;
|
|
delete W._originalOnError;
|
|
sqlite3.opfs = opfsUtil;
|
|
log("End of OPFS sqlite3_vfs setup.", opfsVfs);
|
|
promiseResolve(sqlite3);
|
|
}catch(e){
|
|
error(e);
|
|
promiseReject(e);
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
promiseReject(e);
|
|
error("Unexpected message from the async worker:",data);
|
|
break;
|
|
}
|
|
};
|
|
})/*thePromise*/;
|
|
return thePromise;
|
|
}/*installOpfsVfs()*/;
|
|
sqlite3.installOpfsVfs.defaultProxyUri = "sqlite3-opfs-async-proxy.js";
|
|
}/*sqlite3ApiBootstrap.initializers.push()*/);
|