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Draft for carray module in Rust

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Incomplete support for sqlite3_bind_pointer.
Make Context::set_result return a Result.
Add Values::get_array.
This commit is contained in:
gwenn 2018-06-10 12:16:54 +02:00
parent b89b574f81
commit fa64a4d0bf
10 changed files with 290 additions and 60 deletions
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2
Cargo.toml
View File

@ -31,6 +31,8 @@ sqlcipher = ["libsqlite3-sys/sqlcipher"]
unlock_notify = ["libsqlite3-sys/unlock_notify"]
vtab = ["libsqlite3-sys/min_sqlite_version_3_7_7"]
csvtab = ["csv", "vtab"]
# pointer passing interfaces: 3.20.0
array = ["vtab"]
[dependencies]
time = "0.1.0"

49
src/context.rs
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@ -1,15 +1,18 @@
//! Code related to `sqlite3_context` common to `functions` and `vtab` modules.
use std::error::Error as StdError;
use std::ffi::CStr;
use std::os::raw::{c_char, c_int, c_void};
#[cfg(feature = "array")]
use std::rc::Rc;
use ffi;
use ffi::sqlite3_context;
use ffi::sqlite3_value;
use str_to_cstring;
use types::{ToSqlOutput, ValueRef};
use {str_to_cstring, Error};
#[cfg(feature = "array")]
use vtab::array::{free_array, ARRAY_TYPE};
impl<'a> ValueRef<'a> {
pub unsafe fn from_value(value: *mut sqlite3_value) -> ValueRef<'a> {
@ -28,7 +31,8 @@ impl<'a> ValueRef<'a> {
let s = CStr::from_ptr(text as *const c_char);
// sqlite3_value_text returns UTF8 data, so our unwrap here should be fine.
let s = s.to_str()
let s = s
.to_str()
.expect("sqlite3_value_text returned invalid UTF-8");
ValueRef::Text(s)
}
@ -68,6 +72,15 @@ pub unsafe fn set_result<'a>(ctx: *mut sqlite3_context, result: &ToSqlOutput<'a>
ToSqlOutput::ZeroBlob(len) => {
return ffi::sqlite3_result_zeroblob(ctx, len);
}
#[cfg(feature = "array")]
ToSqlOutput::Array(ref a) => {
return ffi::sqlite3_result_pointer(
ctx,
Rc::into_raw(a.clone()) as *mut c_void,
ARRAY_TYPE,
Some(free_array),
);
}
};
match value {
@ -109,33 +122,3 @@ pub unsafe fn set_result<'a>(ctx: *mut sqlite3_context, result: &ToSqlOutput<'a>
}
}
}
pub unsafe fn report_error(ctx: *mut sqlite3_context, err: &Error) {
// Extended constraint error codes were added in SQLite 3.7.16. We don't have an explicit
// feature check for that, and this doesn't really warrant one. We'll use the extended code
// if we're on the bundled version (since it's at least 3.17.0) and the normal constraint
// error code if not.
#[cfg(feature = "bundled")]
fn constraint_error_code() -> i32 {
ffi::SQLITE_CONSTRAINT_FUNCTION
}
#[cfg(not(feature = "bundled"))]
fn constraint_error_code() -> i32 {
ffi::SQLITE_CONSTRAINT
}
match *err {
Error::SqliteFailure(ref err, ref s) => {
ffi::sqlite3_result_error_code(ctx, err.extended_code);
if let Some(Ok(cstr)) = s.as_ref().map(|s| str_to_cstring(s)) {
ffi::sqlite3_result_error(ctx, cstr.as_ptr(), -1);
}
}
_ => {
ffi::sqlite3_result_error_code(ctx, constraint_error_code());
if let Ok(cstr) = str_to_cstring(err.description()) {
ffi::sqlite3_result_error(ctx, cstr.as_ptr(), -1);
}
}
}
}

33
src/functions.rs
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@ -49,6 +49,7 @@
//! assert!(is_match);
//! }
//! ```
use std::error::Error as StdError;
use std::ptr;
use std::slice;
use std::os::raw::{c_int, c_void};
@ -57,11 +58,41 @@ use ffi;
use ffi::sqlite3_context;
use ffi::sqlite3_value;
use context::{report_error, set_result};
use context::{set_result};
use types::{ToSql, FromSql, FromSqlError, ValueRef};
use {Result, Error, Connection, str_to_cstring, InnerConnection};
unsafe fn report_error(ctx: *mut sqlite3_context, err: &Error) {
// Extended constraint error codes were added in SQLite 3.7.16. We don't have an explicit
// feature check for that, and this doesn't really warrant one. We'll use the extended code
// if we're on the bundled version (since it's at least 3.17.0) and the normal constraint
// error code if not.
#[cfg(feature = "bundled")]
fn constraint_error_code() -> i32 {
ffi::SQLITE_CONSTRAINT_FUNCTION
}
#[cfg(not(feature = "bundled"))]
fn constraint_error_code() -> i32 {
ffi::SQLITE_CONSTRAINT
}
match *err {
Error::SqliteFailure(ref err, ref s) => {
ffi::sqlite3_result_error_code(ctx, err.extended_code);
if let Some(Ok(cstr)) = s.as_ref().map(|s| str_to_cstring(s)) {
ffi::sqlite3_result_error(ctx, cstr.as_ptr(), -1);
}
}
_ => {
ffi::sqlite3_result_error_code(ctx, constraint_error_code());
if let Ok(cstr) = str_to_cstring(err.description()) {
ffi::sqlite3_result_error(ctx, cstr.as_ptr(), -1);
}
}
}
}
unsafe extern "C" fn free_boxed_value<T>(p: *mut c_void) {
let _: Box<T> = Box::from_raw(p as *mut T);
}

9
src/statement.rs
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@ -1,6 +1,8 @@
use std::{convert, fmt, mem, ptr, result, str};
use std::ffi::CStr;
use std::os::raw::{c_char, c_int, c_void};
#[cfg(feature = "array")]
use std::rc::Rc;
use std::slice::from_raw_parts;
use super::ffi;
@ -8,6 +10,8 @@ use super::{Connection, RawStatement, Result, Error, ValueRef, Row, Rows, AndThe
use super::str_to_cstring;
use types::{ToSql, ToSqlOutput};
use row::{RowsCrateImpl, MappedRowsCrateImpl, AndThenRowsCrateImpl};
#[cfg(feature = "array")]
use vtab::array::{ARRAY_TYPE, free_array};
/// A prepared statement.
pub struct Statement<'conn> {
@ -404,6 +408,11 @@ impl<'conn> Statement<'conn> {
return self.conn
.decode_result(unsafe { ffi::sqlite3_bind_zeroblob(ptr, col, len) });
}
#[cfg(feature = "array")]
ToSqlOutput::Array(a) => {
return self.conn
.decode_result(unsafe { ffi::sqlite3_bind_pointer(ptr, col, Rc::into_raw(a) as *mut c_void, ARRAY_TYPE, Some(free_array)) });
}
};
self.conn
.decode_result(match value {

7
src/types/to_sql.rs
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@ -1,4 +1,6 @@
use super::{Null, Value, ValueRef};
#[cfg(feature = "array")]
use vtab::array::Array;
use Result;
/// `ToSqlOutput` represents the possible output types for implementors of the `ToSql` trait.
@ -13,6 +15,9 @@ pub enum ToSqlOutput<'a> {
/// A BLOB of the given length that is filled with zeroes.
#[cfg(feature = "blob")]
ZeroBlob(i32),
#[cfg(feature = "array")]
Array(Array)
}
// Generically allow any type that can be converted into a ValueRef
@ -59,6 +64,8 @@ impl<'a> ToSql for ToSqlOutput<'a> {
#[cfg(feature = "blob")]
ToSqlOutput::ZeroBlob(i) => ToSqlOutput::ZeroBlob(i),
#[cfg(feature = "array")]
ToSqlOutput::Array(ref a) => ToSqlOutput::Array(a.clone()),
})
}
}

179
src/vtab/array.rs Normal file
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@ -0,0 +1,179 @@
//! Array Virtual Table
//! Port of [carray](http://www.sqlite.org/cgi/src/finfo?name=ext/misc/carray.c) C extension.
use std::default::Default;
use std::os::raw::{c_char, c_int, c_void};
use std::rc::Rc;
use ffi;
use types::{ToSql, ToSqlOutput, Value};
use vtab::{self, declare_vtab, Context, IndexInfo, VTab, VTabCursor, Values};
use {Connection, Error, Result};
// http://sqlite.org/bindptr.html
pub(crate) const ARRAY_TYPE: *const c_char = b"rarray\0" as *const u8 as *const c_char;
pub(crate) unsafe extern "C" fn free_array(p: *mut c_void) {
let _: Array = Rc::from_raw(p as *const Vec<Value>);
}
pub type Array = Rc<Vec<Value>>;
impl ToSql for Array {
fn to_sql(&self) -> Result<ToSqlOutput> {
Ok(ToSqlOutput::Array(self.clone()))
}
}
/// Register the "rarray" module.
pub fn load_module(conn: &Connection) -> Result<()> {
let aux: Option<()> = None;
conn.create_module("rarray", &ARRAY_MODULE, aux)
}
eponymous_module!(
ARRAY_MODULE,
ArrayTab,
(),
ArrayTabCursor,
None,
array_connect,
array_best_index,
array_disconnect,
None,
array_open,
array_close,
array_filter,
array_next,
array_eof,
array_column,
array_rowid
);
// Column numbers
// const CARRAY_COLUMN_VALUE : c_int = 0;
const CARRAY_COLUMN_POINTER: c_int = 1;
/// An instance of the Array virtual table
#[repr(C)]
struct ArrayTab {
/// Base class. Must be first
base: ffi::sqlite3_vtab,
}
impl VTab for ArrayTab {
type Aux = ();
type Cursor = ArrayTabCursor;
unsafe fn connect(db: *mut ffi::sqlite3, _aux: *mut (), _args: &[&[u8]]) -> Result<ArrayTab> {
let vtab = ArrayTab {
base: Default::default(),
};
try!(declare_vtab(db, "CREATE TABLE x(value,pointer hidden)"));
Ok(vtab)
}
fn best_index(&self, info: &mut IndexInfo) -> Result<()> {
// Index of the pointer= constraint
let mut ptr_idx = None;
for (i, constraint) in info.constraints().enumerate() {
if !constraint.is_usable() {
continue;
}
if constraint.operator() != vtab::IndexConstraintOp::SQLITE_INDEX_CONSTRAINT_EQ {
continue;
}
match constraint.column() {
CARRAY_COLUMN_POINTER => {
ptr_idx = Some(i);
}
_ => {}
}
}
if let Some(ptr_idx) = ptr_idx {
{
let mut constraint_usage = info.constraint_usage(ptr_idx);
constraint_usage.set_argv_index(1);
constraint_usage.set_omit(true);
}
info.set_estimated_cost(1f64);
info.set_estimated_rows(100);
info.set_idx_num(1);
} else {
info.set_estimated_cost(2_147_483_647f64);
info.set_estimated_rows(2_147_483_647);
info.set_idx_num(0);
}
Ok(())
}
fn open(&self) -> Result<ArrayTabCursor> {
Ok(ArrayTabCursor::new())
}
}
/// A cursor for the Array virtual table
#[repr(C)]
struct ArrayTabCursor {
/// Base class. Must be first
base: ffi::sqlite3_vtab_cursor,
/// The rowid
row_id: i64,
/// Pointer to the array of values ("pointer")
ptr: Option<Array>,
}
impl ArrayTabCursor {
fn new() -> ArrayTabCursor {
ArrayTabCursor {
base: Default::default(),
row_id: 0,
ptr: None,
}
}
fn len(&self) -> i64 {
match self.ptr {
Some(ref a) => a.len() as i64,
_ => 0,
}
}
}
impl VTabCursor for ArrayTabCursor {
type Table = ArrayTab;
fn vtab(&self) -> &ArrayTab {
unsafe { &*(self.base.pVtab as *const ArrayTab) }
}
fn filter(&mut self, idx_num: c_int, _idx_str: Option<&str>, args: &Values) -> Result<()> {
if idx_num > 0 {
self.ptr = try!(args.get_array(0));
} else {
self.ptr = None;
}
self.row_id = 1;
Ok(())
}
fn next(&mut self) -> Result<()> {
self.row_id += 1;
Ok(())
}
fn eof(&self) -> bool {
self.row_id > self.len()
}
fn column(&self, ctx: &mut Context, i: c_int) -> Result<()> {
match i {
CARRAY_COLUMN_POINTER => Ok(()),
_ => {
if let Some(ref array) = self.ptr {
let value = &array[i as usize];
ctx.set_result(&value)
} else {
Ok(())
}
}
}
}
fn rowid(&self) -> Result<i64> {
Ok(self.row_id)
}
}

12
src/vtab/csvtab.rs
View File

@ -327,12 +327,10 @@ impl VTabCursor for CSVTabCursor {
)));
}
if self.cols.is_empty() {
ctx.set_result(&Null);
return Ok(());
return ctx.set_result(&Null);
}
// TODO Affinity
ctx.set_result(&self.cols[col as usize].to_owned());
Ok(())
ctx.set_result(&self.cols[col as usize].to_owned())
}
fn rowid(&self) -> Result<i64> {
Ok(self.row_number as i64)
@ -365,7 +363,8 @@ mod test {
assert_eq!(vec!["rowid", "colA", "colB", "colC"], headers);
}
let ids: Result<Vec<i32>> = s.query_map(&[], |row| row.get::<i32, i32>(0))
let ids: Result<Vec<i32>> = s
.query_map(&[], |row| row.get::<i32, i32>(0))
.unwrap()
.collect();
let sum = ids.unwrap().iter().fold(0, |acc, &id| acc + id);
@ -382,7 +381,8 @@ mod test {
.unwrap();
{
let mut s = db.prepare(
let mut s =
db.prepare(
"SELECT v1.rowid, v1.* FROM vtab v1 NATURAL JOIN vtab v2 WHERE \
v1.rowid < v2.rowid",
).unwrap();

3
src/vtab/int_array.rs
View File

@ -139,9 +139,8 @@ impl VTabCursor for IntArrayVTabCursor {
let vtab = self.vtab();
unsafe {
let array = (*vtab.array).borrow();
ctx.set_result(&array[self.i]);
ctx.set_result(&array[self.i])
}
Ok(())
}
fn rowid(&self) -> Result<i64> {
Ok(self.i as i64)

45
src/vtab/mod.rs
View File

@ -6,7 +6,7 @@ use std::os::raw::{c_char, c_int, c_void};
use std::ptr;
use std::slice;
use context::{report_error, set_result};
use context::set_result;
use error::error_from_sqlite_code;
use ffi;
use types::{FromSql, FromSqlError, ToSql, ValueRef};
@ -207,12 +207,10 @@ pub trait VTabCursor: Sized {
pub struct Context(*mut ffi::sqlite3_context);
impl Context {
pub fn set_result<T: ToSql>(&mut self, value: &T) {
let t = value.to_sql();
match t {
Ok(ref value) => unsafe { set_result(self.0, value) },
Err(err) => unsafe { report_error(self.0, &err) },
}
pub fn set_result<T: ToSql>(&mut self, value: &T) -> Result<()> {
let t = value.to_sql()?;
unsafe { set_result(self.0, &t) };
Ok(())
}
}
@ -241,6 +239,22 @@ impl<'a> Values<'a> {
})
}
// `sqlite3_value_type` returns `SQLITE_NULL` for pointer.
// So it seems not possible to enhance `ValueRef::from_value`.
#[cfg(feature = "array")]
pub fn get_array(&self, idx: usize) -> Result<Option<array::Array>> {
use types::Value;
let arg = self.args[idx];
let ptr = unsafe { ffi::sqlite3_value_pointer(arg, array::ARRAY_TYPE) };
if ptr.is_null() {
Ok(None)
} else {
Ok(Some(unsafe {
array::Array::from_raw(ptr as *const Vec<Value>)
}))
}
}
pub fn iter(&self) -> ValueIter {
ValueIter {
iter: self.args.iter(),
@ -361,12 +375,16 @@ pub fn dequote(s: &str) -> &str {
/// 0 no false off
/// ```
pub fn parse_boolean(s: &str) -> Option<bool> {
if s.eq_ignore_ascii_case("yes") || s.eq_ignore_ascii_case("on")
|| s.eq_ignore_ascii_case("true") || s.eq("1")
if s.eq_ignore_ascii_case("yes")
|| s.eq_ignore_ascii_case("on")
|| s.eq_ignore_ascii_case("true")
|| s.eq("1")
{
Some(true)
} else if s.eq_ignore_ascii_case("no") || s.eq_ignore_ascii_case("off")
|| s.eq_ignore_ascii_case("false") || s.eq("0")
} else if s.eq_ignore_ascii_case("no")
|| s.eq_ignore_ascii_case("off")
|| s.eq_ignore_ascii_case("false")
|| s.eq("0")
{
Some(false)
} else {
@ -530,7 +548,8 @@ macro_rules! create_or_connect {
let aux = aux as *mut $aux;
let args = slice::from_raw_parts(argv, argc as usize);
let vec = args.iter()
let vec = args
.iter()
.map(|&cs| CStr::from_ptr(cs).to_bytes())
.collect::<Vec<_>>();
match $vtab::$vtab_func(db, aux, &vec[..]) {
@ -756,6 +775,8 @@ pub fn mprintf(err_msg: &str) -> *mut c_char {
unsafe { ffi::sqlite3_mprintf(c_format.as_ptr(), c_err.as_ptr()) }
}
#[cfg(feature = "array")]
pub mod array;
#[cfg(feature = "csvtab")]
pub mod csvtab;
pub mod int_array;

3
src/vtab/series.rs
View File

@ -255,8 +255,7 @@ impl VTabCursor for SeriesTabCursor {
SERIES_COLUMN_STEP => self.step,
_ => self.value,
};
ctx.set_result(&x);
Ok(())
ctx.set_result(&x)
}
fn rowid(&self) -> Result<i64> {
Ok(self.row_id)