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Refactor JS API amalgamation such that the bootstrapping/configuration is deferred until the whole amalgamation is available, to facilitate providing clients with a way to initialize the API with their own config (noting that we're still one small level of refactoring away from being able to actually do that).

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FossilOrigin-Name: 9dbe9a6aecec43b51057375ef1d2d632db0d17eac8b7552c20cc91fc2f1a55d1
This commit is contained in:
stephan
2022-08-22 13:34:13 +00:00
parent 64d04a8d9f
commit e3cd67603d
9 changed files with 206 additions and 107 deletions
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23
ext/wasm/api/sqlite3-wasm.c
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@ -435,7 +435,8 @@ int sqlite3_wasm_vfs_unlink(const char * zName){
#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.
** for use by the sqlite project's own JS/WASM bindings, specifically
** only when building with Emscripten's WASMFS support.
**
** This function should only be called if the JS side detects the
** existence of the Origin-Private FileSystem (OPFS) APIs in the
@ -443,14 +444,19 @@ int sqlite3_wasm_vfs_unlink(const char * zName){
** WASMFS backend impl for OPFS. On success, subsequent calls are
** no-ops.
**
** This function may be passed a "mount point" name, which must have a
** leading "/" and is currently restricted to a single path component,
** e.g. "/foo" is legal but "/foo/" and "/foo/bar" are not. If it is
** NULL or empty, it defaults to "/persistent".
**
** Returns 0 on success, SQLITE_NOMEM if instantiation of the backend
** object fails, SQLITE_IOERR if mkdir() of the "/persistent" dir in
** object fails, SQLITE_IOERR if mkdir() of the zMountPoint 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){
int sqlite3_wasm_init_opfs(const char *zMountPoint){
static backend_t pOpfs = 0;
static const char * zDir = "/persistent";
if( !zMountPoint || !*zMountPoint ) zMountPoint = "/persistent";
if( !pOpfs ){
pOpfs = wasmfs_create_opfs_backend();
if( pOpfs ){
@ -459,12 +465,15 @@ int sqlite3_wasm_init_opfs(void){
}
/** 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) ){
if( pOpfs && 0!=access(zMountPoint, 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.");
/* Note that this check and is not robust but it will
hypothetically suffice for the transient wasm-based virtual
filesystem we're currently running in. */
const int rc = wasmfs_create_directory(zMountPoint, 0777, pOpfs);
emscripten_console_logf("OPFS mkdir rc=%d", rc);
if(rc) return SQLITE_IOERR;
}
return pOpfs ? 0 : SQLITE_NOMEM;