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Move the JS pieces of kvvfs into their own file to facilitate pending feature experimentation.

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FossilOrigin-Name: 3c40614285449df259a3444e36f888cfb5e782ea58287914f97f496ea61e9e9f
This commit is contained in:
stephan
2025-11-21 10:49:32 +00:00
parent 1073985be7
commit 40ce52a4e5
8 changed files with 344 additions and 393 deletions
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102
ext/wasm/api/sqlite3-api-glue.c-pp.js
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@@ -988,8 +988,6 @@ globalThis.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
const notThese = Object.assign(Object.create(null),{
// For each struct to NOT register, map its name to true:
WasmTestStruct: true,
/* We unregister the kvvfs VFS from Worker threads below. */
sqlite3_kvvfs_methods: !util.isUIThread(),
/* sqlite3_index_info and friends require int64: */
sqlite3_index_info: !wasm.bigIntEnabled,
sqlite3_index_constraint: !wasm.bigIntEnabled,
@@ -1783,106 +1781,6 @@ globalThis.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
};
}/* auto-extension */
const pKvvfs = capi.sqlite3_vfs_find("kvvfs");
if( pKvvfs ){/* kvvfs-specific glue */
if(util.isUIThread()){
const kvvfsMethods = new capi.sqlite3_kvvfs_methods(
wasm.exports.sqlite3__wasm_kvvfs_methods()
);
delete capi.sqlite3_kvvfs_methods;
const kvvfsMakeKey = wasm.exports.sqlite3__wasm_kvvfsMakeKeyOnPstack,
pstack = wasm.pstack;
const kvvfsStorage = (zClass)=>
((115/*=='s'*/===wasm.peek(zClass))
? sessionStorage : localStorage);
/**
Implementations for members of the object referred to by
sqlite3__wasm_kvvfs_methods(). We swap out the native
implementations with these, which use localStorage or
sessionStorage for their backing store.
*/
const kvvfsImpls = {
xRead: (zClass, zKey, zBuf, nBuf)=>{
const stack = pstack.pointer,
astack = wasm.scopedAllocPush();
try {
const zXKey = kvvfsMakeKey(zClass,zKey);
if(!zXKey) return -3/*OOM*/;
const jKey = wasm.cstrToJs(zXKey);
const jV = kvvfsStorage(zClass).getItem(jKey);
if(!jV) return -1;
const nV = jV.length /* We are relying 100% on v being
ASCII so that jV.length is equal
to the C-string's byte length. */;
if(nBuf<=0) return nV;
else if(1===nBuf){
wasm.poke(zBuf, 0);
return nV;
}
const zV = wasm.scopedAllocCString(jV);
if(nBuf > nV + 1) nBuf = nV + 1;
wasm.heap8u().copyWithin(
Number(zBuf), Number(zV), wasm.ptr.addn(zV, nBuf,- 1)
);
wasm.poke(wasm.ptr.add(zBuf, nBuf, -1), 0);
return nBuf - 1;
}catch(e){
sqlite3.config.error("kvstorageRead()",e);
return -2;
}finally{
pstack.restore(stack);
wasm.scopedAllocPop(astack);
}
},
xWrite: (zClass, zKey, zData)=>{
const stack = pstack.pointer;
try {
const zXKey = kvvfsMakeKey(zClass,zKey);
if(!zXKey) return 1/*OOM*/;
const jKey = wasm.cstrToJs(zXKey);
kvvfsStorage(zClass).setItem(jKey, wasm.cstrToJs(zData));
return 0;
}catch(e){
sqlite3.config.error("kvstorageWrite()",e);
return capi.SQLITE_IOERR;
}finally{
pstack.restore(stack);
}
},
xDelete: (zClass, zKey)=>{
const stack = pstack.pointer;
try {
const zXKey = kvvfsMakeKey(zClass,zKey);
if(!zXKey) return 1/*OOM*/;
kvvfsStorage(zClass).removeItem(wasm.cstrToJs(zXKey));
return 0;
}catch(e){
sqlite3.config.error("kvstorageDelete()",e);
return capi.SQLITE_IOERR;
}finally{
pstack.restore(stack);
}
}
}/*kvvfsImpls*/;
for(const k of Object.keys(kvvfsImpls)){
kvvfsMethods[kvvfsMethods.memberKey(k)] =
wasm.installFunction(
kvvfsMethods.memberSignature(k),
kvvfsImpls[k]
);
}
}else{
/* Worker thread: unregister kvvfs to avoid it being used
for anything other than local/sessionStorage. It "can"
be used that way but it's not really intended to be. */
capi.sqlite3_vfs_unregister(pKvvfs);
delete capi.sqlite3_kvvfs_methods;
}
}/*pKvvfs*/
/* Warn if client-level code makes use of FuncPtrAdapter. */
wasm.xWrap.FuncPtrAdapter.warnOnUse = true;