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Wrap the unsafe functions to the special preupdate hook functions in a safe wrapper.

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This commit is contained in:
Midas Lambrichts 2021-02-26 21:02:06 +01:00
parent ceff6cb8b1
commit 9187b3e960
1 changed files with 68 additions and 29 deletions
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97
src/hooks.rs
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@ -48,27 +48,71 @@ mod preupdate_hook {
use crate::types::ValueRef;
use crate::{Connection, InnerConnection};
// TODO: how to allow user access to these functions, since they should be only accessible in
// the scope of a preupdate_hook callback.
pub struct PreUpdateHookFunctions {
pub enum PreUpdateCase {
Insert(PreUpdateInsert),
Delete(PreUpdateDelete),
Update(PreUpdateUpdate),
}
pub struct PreUpdateInsert {
db: *mut ffi::sqlite3,
}
impl PreUpdateHookFunctions {
pub unsafe fn get_count(&self) -> i32 {
ffi::sqlite3_preupdate_count(self.db)
impl PreUpdateInsert {
pub fn get_count(&self) -> i32 {
unsafe { ffi::sqlite3_preupdate_count(self.db) }
}
pub unsafe fn get_old(&self, i: i32) -> ValueRef {
pub fn get_new<'a>(&'a self, i: i32) -> ValueRef<'a> {
let mut p_value: *mut ffi::sqlite3_value = ptr::null_mut();
ffi::sqlite3_preupdate_old(self.db, i, &mut p_value);
ValueRef::from_value(p_value)
unsafe {
ffi::sqlite3_preupdate_new(self.db, i, &mut p_value);
ValueRef::from_value(p_value)
}
}
}
pub struct PreUpdateDelete {
db: *mut ffi::sqlite3,
}
impl PreUpdateDelete {
pub fn get_count(&self) -> i32 {
unsafe { ffi::sqlite3_preupdate_count(self.db) }
}
pub unsafe fn get_new(&self, i: i32) -> ValueRef {
pub fn get_old<'a>(&'a self, i: i32) -> ValueRef<'a> {
let mut p_value: *mut ffi::sqlite3_value = ptr::null_mut();
ffi::sqlite3_preupdate_new(self.db, i, &mut p_value);
ValueRef::from_value(p_value)
unsafe {
ffi::sqlite3_preupdate_old(self.db, i, &mut p_value);
ValueRef::from_value(p_value)
}
}
}
pub struct PreUpdateUpdate {
db: *mut ffi::sqlite3,
}
impl PreUpdateUpdate {
pub fn get_count(&self) -> i32 {
unsafe { ffi::sqlite3_preupdate_count(self.db) }
}
pub fn get_old<'a>(&'a self, i: i32) -> ValueRef<'a> {
let mut p_value: *mut ffi::sqlite3_value = ptr::null_mut();
unsafe {
ffi::sqlite3_preupdate_old(self.db, i, &mut p_value);
ValueRef::from_value(p_value)
}
}
pub fn get_new<'a>(&'a self, i: i32) -> ValueRef<'a> {
let mut p_value: *mut ffi::sqlite3_value = ptr::null_mut();
unsafe {
ffi::sqlite3_preupdate_new(self.db, i, &mut p_value);
ValueRef::from_value(p_value)
}
}
}
@ -88,7 +132,7 @@ mod preupdate_hook {
#[inline]
pub fn preupdate_hook<'c, F>(&'c self, hook: Option<F>)
where
F: FnMut(Action, &str, &str, i64, i64, &PreUpdateHookFunctions) + Send + 'c,
F: FnMut(Action, &str, &str, i64, i64, &PreUpdateCase) + Send + 'c,
{
self.db.borrow_mut().preupdate_hook(hook);
}
@ -97,12 +141,12 @@ mod preupdate_hook {
impl InnerConnection {
#[inline]
pub fn remove_preupdate_hook(&mut self) {
self.preupdate_hook(None::<fn(Action, &str, &str, i64, i64, &PreUpdateHookFunctions)>);
self.preupdate_hook(None::<fn(Action, &str, &str, i64, i64, &PreUpdateCase)>);
}
fn preupdate_hook<'c, F>(&'c mut self, hook: Option<F>)
where
F: FnMut(Action, &str, &str, i64, i64, &PreUpdateHookFunctions) + Send + 'c,
F: FnMut(Action, &str, &str, i64, i64, &PreUpdateCase) + Send + 'c,
{
unsafe extern "C" fn call_boxed_closure<F>(
p_arg: *mut c_void,
@ -113,7 +157,7 @@ mod preupdate_hook {
row_id: i64,
new_row_id: i64,
) where
F: FnMut(Action, &str, &str, i64, i64, &PreUpdateHookFunctions),
F: FnMut(Action, &str, &str, i64, i64, &PreUpdateCase),
{
use std::ffi::CStr;
use std::str;
@ -128,12 +172,12 @@ mod preupdate_hook {
str::from_utf8(c_slice)
};
// TODO: how to properly allow a user to use the functions
// (sqlite3_preupdate_old,...) that are only in scope
// during the callback?
// Also how to pass in the rowids, because they can be undefined based on the
// action.
let preupdate_hook_functions = PreUpdateHookFunctions { db: sqlite };
let preupdate_hook_functions = match action {
Action::SQLITE_INSERT => PreUpdateCase::Insert(PreUpdateInsert { db: sqlite }),
Action::SQLITE_DELETE => PreUpdateCase::Delete(PreUpdateDelete { db: sqlite }),
Action::SQLITE_UPDATE => PreUpdateCase::Update(PreUpdateUpdate { db: sqlite }),
_ => todo!(),
};
let _ = catch_unwind(|| {
let boxed_hook: *mut F = p_arg as *mut F;
@ -179,7 +223,7 @@ mod preupdate_hook {
#[cfg(test)]
mod test {
use super::super::Action;
use super::PreUpdateHookFunctions;
use super::PreUpdateCase;
use crate::{Connection, Result};
#[test]
@ -188,12 +232,7 @@ mod preupdate_hook {
let mut called = false;
db.preupdate_hook(Some(
|action,
db: &str,
tbl: &str,
row_id,
new_row_id,
_func: &PreUpdateHookFunctions| {
|action, db: &str, tbl: &str, row_id, new_row_id, _func: &PreUpdateCase| {
assert_eq!(Action::SQLITE_INSERT, action);
assert_eq!("main", db);
assert_eq!("foo", tbl);