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Allow user scalar functions to return results.
This removes the need for scalar functions to have direct access to the context (in order to set the return value).
This commit is contained in:
John Gallagher
parent
81ec7fe7cd
commit
3913e89f94
114
src/functions.rs
114
src/functions.rs
@ -221,16 +221,12 @@ impl<T: FromValue> FromValue for Option<T> {
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}
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}
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// sqlite3_user_data
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// sqlite3_get_auxdata
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// sqlite3_set_auxdata
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unsafe extern "C" fn free_boxed_value<T>(p: *mut c_void) {
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let _: Box<T> = Box::from_raw(mem::transmute(p));
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}
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pub struct Context<'a> {
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pub ctx: *mut sqlite3_context,
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ctx: *mut sqlite3_context,
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args: &'a [*mut sqlite3_value],
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}
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@ -274,31 +270,34 @@ impl<'a> Context<'a> {
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}
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impl SqliteConnection {
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pub fn create_scalar_function<F>(&self,
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fn_name: &str,
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n_arg: c_int,
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deterministic: bool,
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x_func: F)
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-> SqliteResult<()>
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where F: FnMut(&Context)
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pub fn create_scalar_function<F, T>(&self,
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fn_name: &str,
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n_arg: c_int,
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deterministic: bool,
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x_func: F)
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-> SqliteResult<()>
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where F: FnMut(&Context) -> SqliteResult<T>,
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T: ToResult
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{
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self.db.borrow_mut().create_scalar_function(fn_name, n_arg, deterministic, x_func)
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}
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}
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impl InnerSqliteConnection {
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fn create_scalar_function<F>(&mut self,
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fn_name: &str,
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n_arg: c_int,
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deterministic: bool,
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x_func: F)
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-> SqliteResult<()>
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where F: FnMut(&Context)
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fn create_scalar_function<F, T>(&mut self,
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fn_name: &str,
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n_arg: c_int,
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deterministic: bool,
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x_func: F)
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-> SqliteResult<()>
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where F: FnMut(&Context) -> SqliteResult<T>,
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T: ToResult
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{
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extern "C" fn call_boxed_closure<F>(ctx: *mut sqlite3_context,
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argc: c_int,
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argv: *mut *mut sqlite3_value)
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where F: FnMut(&Context)
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extern "C" fn call_boxed_closure<F, T>(ctx: *mut sqlite3_context,
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argc: c_int,
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argv: *mut *mut sqlite3_value)
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where F: FnMut(&Context) -> SqliteResult<T>,
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T: ToResult
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{
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unsafe {
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let ctx = Context {
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@ -307,7 +306,15 @@ impl InnerSqliteConnection {
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};
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let boxed_f: *mut F = mem::transmute(ffi::sqlite3_user_data(ctx.ctx));
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assert!(!boxed_f.is_null(), "Internal error - null function pointer");
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(*boxed_f)(&ctx);
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match (*boxed_f)(&ctx) {
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Ok(r) => r.set_result(ctx.ctx),
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Err(e) => {
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ffi::sqlite3_result_error_code(ctx.ctx, e.code);
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if let Ok(cstr) = str_to_cstring(&e.message) {
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ffi::sqlite3_result_error(ctx.ctx, cstr.as_ptr(), -1);
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}
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},
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}
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}
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}
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@ -323,7 +330,7 @@ impl InnerSqliteConnection {
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n_arg,
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flags,
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mem::transmute(boxed_f),
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Some(call_boxed_closure::<F>),
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Some(call_boxed_closure::<F, T>),
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None,
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None,
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Some(mem::transmute(free_boxed_value::<F>)))
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@ -336,20 +343,17 @@ impl InnerSqliteConnection {
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mod test {
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extern crate regex;
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use std::ffi::CString;
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use libc::c_double;
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use self::regex::Regex;
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use SqliteConnection;
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use {SqliteConnection, SqliteError, SqliteResult};
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use ffi;
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use functions::{Context, ToResult};
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use functions::Context;
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fn half(ctx: &Context) {
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fn half(ctx: &Context) -> SqliteResult<c_double> {
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assert!(ctx.len() == 1, "called with unexpected number of arguments");
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match ctx.get::<c_double>(0) {
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Ok(value) => unsafe { (value / 2f64).set_result(ctx.ctx) },
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Err(err) => unsafe { ffi::sqlite3_result_error_code(ctx.ctx, err.code) },
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}
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let value = try!(ctx.get::<c_double>(0));
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Ok(value / 2f64)
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}
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#[test]
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@ -361,50 +365,34 @@ mod test {
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assert_eq!(3f64, result.unwrap());
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}
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fn regexp(ctx: &Context) {
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fn regexp(ctx: &Context) -> SqliteResult<bool> {
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assert!(ctx.len() == 2, "called with unexpected number of arguments");
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let saved_re: Option<&Regex> = unsafe { ctx.get_aux(0) };
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let new_re = match saved_re {
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None => unsafe {
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let raw = ctx.get::<String>(0);
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if raw.is_err() {
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let msg = CString::new(format!("{}", raw.unwrap_err())).unwrap();
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ffi::sqlite3_result_error(ctx.ctx, msg.as_ptr(), -1);
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return;
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}
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let comp = Regex::new(raw.unwrap().as_ref());
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if comp.is_err() {
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let msg = CString::new(format!("{}", comp.unwrap_err())).unwrap();
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ffi::sqlite3_result_error(ctx.ctx, msg.as_ptr(), -1);
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return;
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}
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Some(comp.unwrap())
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None => {
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let s = try!(ctx.get::<String>(0));
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let r = try!(Regex::new(&s).map_err(|e| SqliteError {
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code: ffi::SQLITE_ERROR,
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message: format!("Invalid regular expression: {}", e),
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}));
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Some(r)
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},
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Some(_) => None,
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};
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{
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let is_match = {
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let re = saved_re.unwrap_or_else(|| new_re.as_ref().unwrap());
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let text = ctx.get::<String>(1);
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if text.is_ok() {
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let text = text.unwrap();
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unsafe {
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re.is_match(text.as_ref()).set_result(ctx.ctx);
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}
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} else {
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let msg = CString::new(format!("{}", text.unwrap_err())).unwrap();
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unsafe {
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ffi::sqlite3_result_error(ctx.ctx, msg.as_ptr(), -1);
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}
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return;
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}
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}
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let text = try!(ctx.get::<String>(1));
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re.is_match(&text)
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};
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if let Some(re) = new_re {
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ctx.set_aux(0, re);
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}
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Ok(is_match)
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}
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#[test]
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