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Build fiddle with WASMFS OPFS support and attempt to use it if available. It does not work because of an inexplicable exception in Emscripten-generated code and perpetually-locked db, but it's not yet clear why.

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FossilOrigin-Name: a16f0a46ec88c560f73d5664e4bf53fb5dd1a22e99a92c11b5c8d784816c3282
This commit is contained in:
stephan
2022-08-12 17:57:09 +00:00
parent 5b0e63eb4c
commit a579f4400d
9 changed files with 303 additions and 227 deletions
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46
ext/wasm/api/sqlite3-wasm.c
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@ -411,3 +411,49 @@ const char * sqlite3_wasm_enum_json(void){
#undef outf
#undef lenCheck
}
/*
** This function is NOT part of the sqlite3 public API. It is strictly
** for use by the sqlite project's own JS/WASM bindings.
**
** This function invokes the xDelete method of the default VFS,
** passing on the given filename. If zName is NULL, no default VFS is
** found, or it has no xDelete method, SQLITE_MISUSE is returned, else
** the result of the xDelete() call is returned.
*/
int sqlite3_wasm_vfs_unlink(const char * zName){
int rc = SQLITE_MISUSE /* ??? */;
sqlite3_vfs * const pVfs = sqlite3_vfs_find(0);
if( zName && pVfs && pVfs->xDelete ){
rc = pVfs->xDelete(pVfs, zName, 1);
}
return rc;
}
#ifdef __EMSCRIPTEN__
#include <emscripten/wasmfs.h>
#include <emscripten/console.h>
/*
** This function is NOT part of the sqlite3 public API. It is strictly
** for use by the sqlite project's own JS/WASM bindings.
**
** This function should only be called if the JS side detects the
** existence of the Origin-Private FileSystem (OPFS) APIs in the
** client. The first time it is called, this function instantiates a
** WASMFS backend impl for OPFS. On success, subsequent calls are
** no-ops.
**
** Returns 0 on success, SQLITE_NOMEM if intantiation of the backend
** object fails.
*/
int sqlite3_wasm_init_opfs(void){
static backend_t pOpfs = 0;
if( !pOpfs ){
pOpfs = wasmfs_create_opfs_backend();
if( pOpfs ){
emscripten_console_log("Created OPFS WASMFS backend.");
}
}
return pOpfs ? 0 : SQLITE_NOMEM;
}
#endif /* __EMSCRIPTEN__ */