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Cleanups in the wasmfs/opfs integration but disable it in order to get the build into a known-working state before continuing with experimentation.

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FossilOrigin-Name: 41045be752a5bd7966849638f3ca56f4905308df70f79f2cb6196ca7dce9d525
This commit is contained in:
stephan
2022-08-13 13:56:00 +00:00
parent 90218aec7a
commit 9a4c63b0fc
7 changed files with 103 additions and 29 deletions
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27
ext/wasm/api/sqlite3-wasm.c
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@ -430,7 +430,7 @@ int sqlite3_wasm_vfs_unlink(const char * zName){
return rc;
}
#ifdef __EMSCRIPTEN__
#if defined(__EMSCRIPTEN__) && defined(SQLITE_WASM_OPFS)
#include <emscripten/wasmfs.h>
#include <emscripten/console.h>
/*
@ -443,17 +443,34 @@ int sqlite3_wasm_vfs_unlink(const char * zName){
** 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.
** Returns 0 on success, SQLITE_NOMEM if instantiation of the backend
** object fails, SQLITE_IOERR if mkdir() of the "/persistent" dir in
** the virtual FS fails. In builds compiled without SQLITE_WASM_OPFS
** defined, SQLITE_NOTFOUND is returned without side effects.
*/
int sqlite3_wasm_init_opfs(void){
static backend_t pOpfs = 0;
static const char * zDir = "/persistent";
if( !pOpfs ){
pOpfs = wasmfs_create_opfs_backend();
if( pOpfs ){
emscripten_console_log("Created OPFS WASMFS backend.");
emscripten_console_log("Created WASMFS OPFS backend.");
}
}
/** It's not enough to instantiate the backend. We have to create a
mountpoint in the VFS and attach the backend to it. */
if( pOpfs && 0!=access(zDir, F_OK) ){
/* mkdir() simply hangs when called from fiddle app. Cause is
not yet determined but the hypothesis is an init-order
issue. */
const int rc = wasmfs_create_directory(zDir, 0777, pOpfs);
emscripten_console_log(rc ? "OPFS mkdir failed." : "OPFS mkdir ok.");
if(rc) return SQLITE_IOERR;
}
return pOpfs ? 0 : SQLITE_NOMEM;
}
#endif /* __EMSCRIPTEN__ */
#else
int sqlite3_wasm_init_opfs(void){
return SQLITE_NOTFOUND;
}
#endif /* __EMSCRIPTEN__ && SQLITE_WASM_OPFS */