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Replace functions::ToResult with ToSql.

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This commit is contained in:
John Gallagher 2016-05-26 00:06:53 -04:00
parent 13bff6fab6
commit 6467815d02
1 changed files with 80 additions and 127 deletions
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187
src/functions.rs
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@ -54,7 +54,7 @@ use std::ffi::CStr;
use std::mem;
use std::ptr;
use std::slice;
use libc::{c_int, c_double, c_char, c_void};
use libc::{c_int, c_char, c_void};
use ffi;
pub use ffi::sqlite3_context;
@ -62,98 +62,71 @@ pub use ffi::sqlite3_value;
pub use ffi::sqlite3_value_type;
pub use ffi::sqlite3_value_numeric_type;
use types::{Null, FromSql, ValueRef};
use types::{ToSql, ToSqlOutput, FromSql, ValueRef};
use {Result, Error, Connection, str_to_cstring, InnerConnection};
/// A trait for types that can be converted into the result of an SQL function.
pub trait ToResult {
unsafe fn set_result(&self, ctx: *mut sqlite3_context);
}
fn set_result<'a>(ctx: *mut sqlite3_context, result: &ToSqlOutput<'a>) {
let value = match *result {
ToSqlOutput::Borrowed(v) => v,
ToSqlOutput::Owned(ref v) => ValueRef::from(v),
macro_rules! raw_to_impl(
($t:ty, $f:ident) => (
impl ToResult for $t {
unsafe fn set_result(&self, ctx: *mut sqlite3_context) {
ffi::$f(ctx, *self)
#[cfg(feature = "blob")]
ToSqlOutput::ZeroBlob(len) => {
return unsafe { ffi::sqlite3_result_zeroblob(ctx, len) };
}
}
)
);
};
raw_to_impl!(c_int, sqlite3_result_int);
raw_to_impl!(i64, sqlite3_result_int64);
raw_to_impl!(c_double, sqlite3_result_double);
impl<'a> ToResult for bool {
unsafe fn set_result(&self, ctx: *mut sqlite3_context) {
if *self {
ffi::sqlite3_result_int(ctx, 1)
} else {
ffi::sqlite3_result_int(ctx, 0)
}
}
}
impl<'a> ToResult for &'a str {
unsafe fn set_result(&self, ctx: *mut sqlite3_context) {
let length = self.len();
match value {
ValueRef::Null => unsafe { ffi::sqlite3_result_null(ctx) },
ValueRef::Integer(i) => unsafe { ffi::sqlite3_result_int64(ctx, i) },
ValueRef::Real(r) => unsafe { ffi::sqlite3_result_double(ctx, r) },
ValueRef::Text(ref s) => unsafe {
let length = s.len();
if length > ::std::i32::MAX as usize {
ffi::sqlite3_result_error_toobig(ctx);
return;
}
match str_to_cstring(self) {
Ok(c_str) => {
ffi::sqlite3_result_text(ctx,
c_str.as_ptr(),
length as c_int,
ffi::SQLITE_TRANSIENT())
}
} else {
let c_str = match str_to_cstring(s) {
Ok(c_str) => c_str,
// TODO sqlite3_result_error
Err(_) => ffi::sqlite3_result_error_code(ctx, ffi::SQLITE_MISUSE),
Err(_) => return ffi::sqlite3_result_error_code(ctx, ffi::SQLITE_MISUSE),
};
let destructor = if length > 0 {
ffi::SQLITE_TRANSIENT()
} else {
ffi::SQLITE_STATIC()
};
ffi::sqlite3_result_text(ctx, c_str.as_ptr(), length as c_int, destructor);
}
}
}
impl ToResult for String {
unsafe fn set_result(&self, ctx: *mut sqlite3_context) {
(&self[..]).set_result(ctx)
}
}
impl<'a> ToResult for &'a [u8] {
unsafe fn set_result(&self, ctx: *mut sqlite3_context) {
if self.len() > ::std::i32::MAX as usize {
},
ValueRef::Blob(ref b) => unsafe {
let length = b.len();
if length > ::std::i32::MAX as usize {
ffi::sqlite3_result_error_toobig(ctx);
return;
} else if length == 0 {
ffi::sqlite3_result_zeroblob(ctx, 0)
} else {
ffi::sqlite3_result_blob(ctx, b.as_ptr() as *const c_void, length as c_int, ffi::SQLITE_TRANSIENT());
}
ffi::sqlite3_result_blob(ctx,
mem::transmute(self.as_ptr()),
self.len() as c_int,
ffi::SQLITE_TRANSIENT())
},
}
}
impl ToResult for Vec<u8> {
unsafe fn set_result(&self, ctx: *mut sqlite3_context) {
(&self[..]).set_result(ctx)
unsafe fn report_error(ctx: *mut sqlite3_context, err: &Error) {
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);
}
}
impl<T: ToResult> ToResult for Option<T> {
unsafe fn set_result(&self, ctx: *mut sqlite3_context) {
match *self {
None => ffi::sqlite3_result_null(ctx),
Some(ref t) => t.set_result(ctx),
_ => {
ffi::sqlite3_result_error_code(ctx, ffi::SQLITE_CONSTRAINT_FUNCTION);
if let Ok(cstr) = str_to_cstring(err.description()) {
ffi::sqlite3_result_error(ctx, cstr.as_ptr(), -1);
}
}
}
impl ToResult for Null {
unsafe fn set_result(&self, ctx: *mut sqlite3_context) {
ffi::sqlite3_result_null(ctx)
}
}
impl<'a> ValueRef<'a> {
@ -259,7 +232,7 @@ impl<'a> Context<'a> {
/// `A` is the type of the aggregation context and `T` is the type of the final result.
/// Implementations should be stateless.
pub trait Aggregate<A, T>
where T: ToResult
where T: ToSql
{
/// Initializes the aggregation context. Will be called prior to the first call
/// to `step()` to set up the context for an invocation of the function. (Note:
@ -316,7 +289,7 @@ impl Connection {
x_func: F)
-> Result<()>
where F: FnMut(&Context) -> Result<T>,
T: ToResult
T: ToSql
{
self.db.borrow_mut().create_scalar_function(fn_name, n_arg, deterministic, x_func)
}
@ -333,7 +306,7 @@ impl Connection {
aggr: D)
-> Result<()>
where D: Aggregate<A, T>,
T: ToResult
T: ToSql
{
self.db
.borrow_mut()
@ -361,13 +334,13 @@ impl InnerConnection {
x_func: F)
-> Result<()>
where F: FnMut(&Context) -> Result<T>,
T: ToResult
T: ToSql
{
unsafe extern "C" fn call_boxed_closure<F, T>(ctx: *mut sqlite3_context,
argc: c_int,
argv: *mut *mut sqlite3_value)
where F: FnMut(&Context) -> Result<T>,
T: ToResult
T: ToSql
{
let ctx = Context {
ctx: ctx,
@ -375,20 +348,14 @@ impl InnerConnection {
};
let boxed_f: *mut F = mem::transmute(ffi::sqlite3_user_data(ctx.ctx));
assert!(!boxed_f.is_null(), "Internal error - null function pointer");
match (*boxed_f)(&ctx) {
Ok(r) => r.set_result(ctx.ctx),
Err(Error::SqliteFailure(err, s)) => {
ffi::sqlite3_result_error_code(ctx.ctx, err.extended_code);
if let Some(Ok(cstr)) = s.map(|s| str_to_cstring(&s)) {
ffi::sqlite3_result_error(ctx.ctx, cstr.as_ptr(), -1);
}
}
Err(err) => {
ffi::sqlite3_result_error_code(ctx.ctx, ffi::SQLITE_CONSTRAINT_FUNCTION);
if let Ok(cstr) = str_to_cstring(err.description()) {
ffi::sqlite3_result_error(ctx.ctx, cstr.as_ptr(), -1);
}
}
let t = (*boxed_f)(&ctx);
let t = t.as_ref().map(|t| ToSql::to_sql(t));
match t {
Ok(Ok(ref value)) => set_result(ctx.ctx, value),
Ok(Err(err)) => report_error(ctx.ctx, &err),
Err(err) => report_error(ctx.ctx, err),
}
}
@ -419,7 +386,7 @@ impl InnerConnection {
aggr: D)
-> Result<()>
where D: Aggregate<A, T>,
T: ToResult
T: ToSql
{
unsafe fn aggregate_context<A>(ctx: *mut sqlite3_context,
bytes: usize)
@ -431,28 +398,11 @@ impl InnerConnection {
Some(pac)
}
unsafe fn report_aggregate_error(ctx: *mut sqlite3_context, err: Error) {
match err {
Error::SqliteFailure(err, s) => {
ffi::sqlite3_result_error_code(ctx, err.extended_code);
if let Some(Ok(cstr)) = s.map(|s| str_to_cstring(&s)) {
ffi::sqlite3_result_error(ctx, cstr.as_ptr(), -1);
}
}
_ => {
ffi::sqlite3_result_error_code(ctx, ffi::SQLITE_CONSTRAINT_FUNCTION);
if let Ok(cstr) = str_to_cstring(err.description()) {
ffi::sqlite3_result_error(ctx, cstr.as_ptr(), -1);
}
}
}
}
unsafe extern "C" fn call_boxed_step<A, D, T>(ctx: *mut sqlite3_context,
argc: c_int,
argv: *mut *mut sqlite3_value)
where D: Aggregate<A, T>,
T: ToResult
T: ToSql
{
let boxed_aggr: *mut D = mem::transmute(ffi::sqlite3_user_data(ctx));
assert!(!boxed_aggr.is_null(),
@ -477,13 +427,13 @@ impl InnerConnection {
match (*boxed_aggr).step(&mut ctx, &mut **pac) {
Ok(_) => {}
Err(err) => report_aggregate_error(ctx.ctx, err),
Err(err) => report_error(ctx.ctx, &err),
};
}
unsafe extern "C" fn call_boxed_final<A, D, T>(ctx: *mut sqlite3_context)
where D: Aggregate<A, T>,
T: ToResult
T: ToSql
{
let boxed_aggr: *mut D = mem::transmute(ffi::sqlite3_user_data(ctx));
assert!(!boxed_aggr.is_null(),
@ -503,10 +453,13 @@ impl InnerConnection {
None => None,
};
match (*boxed_aggr).finalize(a) {
Ok(r) => r.set_result(ctx),
Err(err) => report_aggregate_error(ctx, err),
};
let t = (*boxed_aggr).finalize(a);
let t = t.as_ref().map(|t| ToSql::to_sql(t));
match t {
Ok(Ok(ref value)) => set_result(ctx, value),
Ok(Err(err)) => report_error(ctx, &err),
Err(err) => report_error(ctx, err),
}
}
let boxed_aggr: *mut D = Box::into_raw(Box::new(aggr));