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Add an option to force the opfs-sahpool VFS init to re-run after it fails on a first attempt, as a workaround for flaky environments where initial access to OPFS sync access handles is rejected but then permitted on a second attempt. Reported and discussed in [https://github.com/sqlite/sqlite-wasm/issues/79|issue #79 of the npm distribution].

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FossilOrigin-Name: 5286e0f654d91a4ebee51fcabaab696e17ff07bb18990b401a31bd3d1213e695
This commit is contained in:
stephan
2024-07-11 11:04:17 +00:00
parent 64ef4582c2
commit 9958c51a5d
4 changed files with 64 additions and 30 deletions
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45
ext/wasm/api/sqlite3-vfs-opfs-sahpool.c-pp.js
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@ -102,7 +102,8 @@ globalThis.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
clearOnInit: false,
/* Logging verbosity 3+ == everything, 2 == warnings+errors, 1 ==
errors only. */
verbosity: 2
verbosity: 2,
forceReinitIfFailed: false
});
/** Logging routines, from most to least serious. */
@ -1004,9 +1005,6 @@ globalThis.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
return true;
};
/** Only for testing a rejection case. */
let instanceCounter = 0;
/**
installOpfsSAHPoolVfs() asynchronously initializes the OPFS
SyncAccessHandle (a.k.a. SAH) Pool VFS. It returns a Promise which
@ -1081,12 +1079,26 @@ globalThis.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
the default directory. If no directory is explicitly provided
then a directory name is synthesized from the `name` option.
Peculiarities of this VFS:
- `forceReinitIfFailed`: (default=`false`) Is a fallback option
to assist in working around certain flaky environments which may
mysteriously fail to permit access to OPFS sync access handles on
an initial attempt but permit it on a second attemp. This option
should never be used but is provided for those who choose to
throw caution to the wind and trust such environments. If this
option is truthy _and_ the previous attempt to initialize this
VFS with the same `name` failed, the VFS will attempt to
initialize a second time instead of returning the cached
failure. See discussion at:
<https://github.com/sqlite/sqlite-wasm/issues/79>
Peculiarities of this VFS vis a vis other SQLite VFSes:
- Paths given to it _must_ be absolute. Relative paths will not
be properly recognized. This is arguably a bug but correcting it
requires some hoop-jumping in routines which have no business
doing tricks.
doing such tricks.
- It is possible to install multiple instances under different
names, each sandboxed from one another inside their own private
@ -1207,13 +1219,19 @@ globalThis.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
handles are currently in use, e.g. by an sqlite3 db.
*/
sqlite3.installOpfsSAHPoolVfs = async function(options=Object.create(null)){
const vfsName = options.name || optionDefaults.name;
if(0 && 2===++instanceCounter){
throw new Error("Just testing rejection.");
options = Object.assign(Object.create(null), optionDefaults, (options||{}));
const vfsName = options.name;
if(options.$testThrowPhase1){
throw options.$testThrowPhase1;
}
if(initPromises[vfsName]){
//console.warn("Returning same OpfsSAHPool result",options,vfsName,initPromises[vfsName]);
return initPromises[vfsName];
const p = initPromises[vfsName];
if( (p instanceof OpfsSAHPool) || !options.forceReinitIfFailed ){
//log("Returning cached installOpfsSAHPoolVfs() result",options,vfsName,initPromises[vfsName]);
return p;
}
delete initPromises[vfsName];
/* Fall through and try again. */
}
if(!globalThis.FileSystemHandle ||
!globalThis.FileSystemDirectoryHandle ||
@ -1238,8 +1256,8 @@ globalThis.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
ensues.
*/
return initPromises[vfsName] = apiVersionCheck().then(async function(){
if(options.$testThrowInInit){
throw options.$testThrowInInit;
if(options.$testThrowPhase2){
throw options.$testThrowPhase2;
}
const thePool = new OpfsSAHPool(options);
return thePool.isReady.then(async()=>{
@ -1255,7 +1273,6 @@ globalThis.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
oo1.DB.dbCtorHelper.call(this, opt);
};
OpfsSAHPoolDb.prototype = Object.create(oo1.DB.prototype);
// yes or no? OpfsSAHPoolDb.PoolUtil = poolUtil;
poolUtil.OpfsSAHPoolDb = OpfsSAHPoolDb;
oo1.DB.dbCtorHelper.setVfsPostOpenSql(
theVfs.pointer,