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Address documentation nits.

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Emily Toop 2018-05-11 12:16:45 +01:00
parent 5b52e2115f
commit f38f27f848
1 changed files with 109 additions and 277 deletions
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386
ffi/src/lib.rs
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@ -19,34 +19,37 @@
//! Mentat's FFI contains unsafe code. As it is an interface between foreign code
//! and native Rust code, Rust cannot guarantee that the types and data that have been passed
//! to it from another language are present and in the format it is expecting.
//! This interface is designed to ensure that nothing unsafe ever leaves this module
//! and enters Mentat proper.
//! This interface is designed to ensure that nothing unsafe passes through this module
//! and enters Mentat proper
//!
//! Structs defined with `#[repr(C)]` are guaranteed to have a layout that is compatible
//! with the platform's representation in C.
//!
//! This API passes pointers in two ways, depending on the lifetime of the value and
//! what value owns it.
//! Pointers to values that can be guaranteed to live beyond the lifetime of the function,
//! Pointers to values that are guaranteed to live beyond the lifetime of the function,
//! are passed over the FFI as a raw pointer.
//!
//! ```
//! value as *const TypedValue
//! ```
//! Pointers to values that cannot be guaranteed to live beyond the lifetime of the function
//! are first `Box`ed so that they live on the heap, and the raw pointer passed this way.
//!
//! ```
//! Box::into_raw(Box::new(value))
//! ```
//!
//! The memory for values that are moved onto the heap before being passed over the FFI
//! are no longer managed by Rust, but Rust still owns the value. Therefore the pointer
//! The memory for a value that is moved onto the heap before being passed over the FFI
//! is no longer managed by Rust, but Rust still owns the value. Therefore the pointer
//! must be returned to Rust in order to be released. To this effect a number of `destructor`
//! functions are provided for each Rust value type that is passed, and a catch all destructor
//! is provided to release memory for `#[repr(C)]` values.
//! The destructors reclaim the memory via `Box` and then drop the reference, causing the
//! functions are provided for each Rust value type that is passed, as is a catch all destructor
//! to release memory for `#[repr(C)]` values.
//! The destructors reclaim the memory via [Box](std::boxed::Box) and then drop the reference, causing the
//! memory to be released.
//!
//! A macro has been provided to make defining destructors easier.
//!
//! ```
//! define_destructor!(query_builder_destroy, QueryBuilder);
//! ```
@ -55,17 +58,18 @@
//! so callers have to be careful to ensure they manage their pointers properly.
//! Failure to call a destructor for a value on the heap will cause a memory leak.
//!
//! Most of the functions exposed in this FFI have a direct mapping to existing Mentat APIs.
//! Application logic has been kept to a minumum in order to provide the greatest flexibility
//! for callers using the interface, however there are a one exception where several steps
//! have been wrapped into a single call in order to make the interface easier to use.
//! `store_register_observer` takes a single native callback function which is wrapped inside a
//! Rust closure and added to a `TxObserver` struct. This is then used to register the
//! observer with the store.
//! Generally, the functions exposed in this module have a direct mapping to existing Mentat APIs,
//! in order to keep application logic to a minumum and provide the greatest flexibility
//! for callers using the interface. However, in some cases a single convenience function
//! has been provided in order to make the interface easier to use and reduce the number
//! of calls that have to be made over the FFI to perform a task. An example of this is
//! `store_register_observer`, which takes a single native callback function that is then
//! wrapped inside a Rust closure and added to a [TxObserver](mentat::TxObserver) struct. This is then used to
//! register the observer with the store.
//!
//! `Result` and `Option` Rust types have `repr(C)` structs that mirror them. This is to provide a more
//! [Result](std::result::Result) and [Option](std::option::Option) Rust types have `repr(C)` structs that mirror them. This is to provide a more
//! native access pattern to callers and to enable easier passing of optional types and error
//! propogation. These types have implemented `From` such that conversion from the Rust type
//! propogation. These types have implemented [From](std::convert::From) such that conversion from the Rust type
//! to the C type is as painless as possible.
//!
extern crate libc;
@ -130,7 +134,7 @@ pub use utils::log;
pub type BindingIterator = vec::IntoIter<Binding>;
pub type BindingListIterator = std::slice::Chunks<'static, mentat::Binding>;
/// A C representation of the a change provided by the transaction observers
/// A C representation of the change provided by the transaction observers
/// from a single transact.
/// Holds a transaction identifier, the changes as a set of affected attributes
/// and the length of the list of changes.
@ -163,9 +167,9 @@ pub struct TxChangeList {
pub len: usize,
}
/// A C representation Rust's Option.
/// A value of Some results in `value` containing a raw pointer as a `c_void`.
/// A value of None results in `value` containing a null pointer.
/// A C representation Rust's [Option](std::option::Option).
/// A value of `Some` results in `value` containing a raw pointer as a `c_void`.
/// A value of `None` results in `value` containing a null pointer.
///
/// #Safety
///
@ -186,10 +190,10 @@ impl<T> From<Option<T>> for ExternOption {
}
}
/// A C representation Rust's Result.
/// A value of Ok results in `ok` containing a raw pointer as a `c_void`
/// A C representation Rust's [Result](std::result::Result).
/// A value of `Ok` results in `ok` containing a raw pointer as a `c_void`
/// and `err` containing a null pointer.
/// A value of Err results in `value` containing a null pointer and `err` containing an error message.
/// A value of `Err` results in `value` containing a null pointer and `err` containing an error message.
///
/// #Safety
///
@ -225,8 +229,8 @@ impl<T, E> From<Result<T, E>> for ExternResult where E: std::error::Error {
/// A store cannot be opened twice to the same location.
/// Once created, the reference to the store is held by the caller and not Rust,
/// therefore the caller is responsible for calling `destroy` to release the memory
/// used by the Store in order to avoid a memory leak.
/// TODO: Start returning `ExternResult`s rather than crashing on error.
/// used by the [Store](mentat::Store) in order to avoid a memory leak.
// TODO: Start returning `ExternResult`s rather than crashing on error.
///
/// # Safety
///
@ -254,14 +258,11 @@ pub extern "C" fn store_open(uri: *const c_char) -> *mut Store {
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Store` is not dangling and that
/// the C string provided to `transaction` is valid.
///
/// Callers are responsible for managing the memory for the return value.
/// A destructor `destroy` is provided for releasing the memory for this
/// pointer type.
///
/// TODO: Document the errors that can result from transact
// TODO: Document the errors that can result from transact
#[no_mangle]
pub unsafe extern "C" fn store_transact(store: *mut Store, transaction: *const c_char) -> *mut ExternResult {
let store = &mut*store;
@ -275,35 +276,22 @@ pub unsafe extern "C" fn store_transact(store: *mut Store, transaction: *const c
Box::into_raw(Box::new(result.into()))
}
/// Fetches the `tx_id` for the given `TxReport`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `TxReport` is not dangling.
/// Fetches the `tx_id` for the given [TxReport](mentat::TxReport).
#[no_mangle]
pub unsafe extern "C" fn tx_report_get_entid(tx_report: *mut TxReport) -> c_longlong {
let tx_report = &*tx_report;
tx_report.tx_id as c_longlong
}
/// Fetches the `tx_instant` for the given `TxReport`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `TxReport` is not dangling.
/// Fetches the `tx_instant` for the given [TxReport](mentat::TxReport).
#[no_mangle]
pub unsafe extern "C" fn tx_report_get_tx_instant(tx_report: *mut TxReport) -> c_longlong {
let tx_report = &*tx_report;
tx_report.tx_instant.timestamp() as c_longlong
}
/// Fetches the `Entid` assigned to the `tempid` during the transaction represented
/// by the given `TxReport`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `TxReport` is not dangling and that
/// the C string provided to `tempid` is valid.
/// Fetches the [Entid](mentat::Entid) assigned to the `tempid` during the transaction represented
/// by the given [TxReport](mentat::TxReport).
#[no_mangle]
pub unsafe extern "C" fn tx_report_entity_for_temp_id(tx_report: *mut TxReport, tempid: *const c_char) -> *mut c_longlong {
let tx_report = &*tx_report;
@ -319,18 +307,15 @@ pub unsafe extern "C" fn tx_report_entity_for_temp_id(tx_report: *mut TxReport,
// TODO: q_once
/// Creates a `QueryBuilder` from the given store to execute the provided query.
/// Creates a [QueryBuilder](mentat::QueryBuilder) from the given store to execute the provided query.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Store` is not dangling and that
/// the C string provided to `query` is valid.
///
/// Callers are responsible for managing the memory for the return value.
/// A destructor `query_builder_destroy` is provided for releasing the memory for this
/// pointer type.
///
/// TODO: Update QueryBuilder so it only takes a `Store` pointer on execution
/// TODO: Update QueryBuilder so it only takes a [Store](mentat::Store) pointer on execution
#[no_mangle]
pub unsafe extern "C" fn store_query<'a>(store: *mut Store, query: *const c_char) -> *mut QueryBuilder<'a> {
let query = c_char_to_string(query);
@ -339,12 +324,7 @@ pub unsafe extern "C" fn store_query<'a>(store: *mut Store, query: *const c_char
Box::into_raw(Box::new(query_builder))
}
/// Binds a `TypedValue::Long` to a `Variable` with the given name.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `QueryBuilder` is not dangling and that
/// the C string provided to `var` is valid.
/// Binds a [TypedValue::Long](mentat::TypedValue::Long) to a [Variable](mentat::Variable) with the given name.
#[no_mangle]
pub unsafe extern "C" fn query_builder_bind_long(query_builder: *mut QueryBuilder, var: *const c_char, value: c_longlong) {
let var = c_char_to_string(var);
@ -352,12 +332,7 @@ pub unsafe extern "C" fn query_builder_bind_long(query_builder: *mut QueryBuilde
query_builder.bind_long(&var, value);
}
/// Binds a `TypedValue::Ref` to a `Variable` with the given name.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `QueryBuilder` is not dangling and that
/// the C string provided to `var` is valid.
/// Binds a [TypedValue::Ref](mentat::TypedValue::Ref) to a [Variable](mentat::Variable) with the given name.
#[no_mangle]
pub unsafe extern "C" fn query_builder_bind_ref(query_builder: *mut QueryBuilder, var: *const c_char, value: c_longlong) {
let var = c_char_to_string(var);
@ -365,17 +340,12 @@ pub unsafe extern "C" fn query_builder_bind_ref(query_builder: *mut QueryBuilder
query_builder.bind_ref(&var, value);
}
/// Binds a `TypedValue::Ref` to a `Variable` with the given name. Takes a keyword as a c string in the format
/// `:namespace/name` and converts it into an `NamespacedKeyword`.
/// Binds a [TypedValue::Ref](mentat::TypedValue::Ref) to a [Variable](mentat::Variable) with the given name. Takes a keyword as a c string in the format
/// `:namespace/name` and converts it into an [NamespacedKeyworf](mentat::NamespacedKeyword).
///
/// # Panics
///
/// If the provided keyword does not map to a valid keyword in the schema.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `QueryBuilder` is not dangling and that
/// the C strings provided to `var` and `value` are valid.
#[no_mangle]
pub unsafe extern "C" fn query_builder_bind_ref_kw(query_builder: *mut QueryBuilder, var: *const c_char, value: *const c_char) {
let var = c_char_to_string(var);
@ -386,13 +356,8 @@ pub unsafe extern "C" fn query_builder_bind_ref_kw(query_builder: *mut QueryBuil
}
}
/// Binds a `TypedValue::Keyword` to a `Variable` with the given name. Takes a keyword as a c string in the format
/// `:namespace/name` and converts it into an `NamespacedKeyword`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `QueryBuilder` is not dangling and that
/// the C strings provided to `var` and `value` are valid.
/// Binds a [TypedValue::Ref](mentat::TypedValue::Ref) to a [Variable](mentat::Variable) with the given name. Takes a keyword as a c string in the format
/// `:namespace/name` and converts it into an [NamespacedKeyworf](mentat::NamespacedKeyword).
#[no_mangle]
pub unsafe extern "C" fn query_builder_bind_kw(query_builder: *mut QueryBuilder, var: *const c_char, value: *const c_char) {
let var = c_char_to_string(var);
@ -401,12 +366,7 @@ pub unsafe extern "C" fn query_builder_bind_kw(query_builder: *mut QueryBuilder,
query_builder.bind_value(&var, kw);
}
/// Binds a `TypedValue::Boolean` to a `Variable` with the given name.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `QueryBuilder` is not dangling and that
/// the C string provided to `var` is valid.
/// Binds a [TypedValue::Boolean](mentat::TypedValue::Boolean) to a [Variable](mentat::Variable) with the given name.
#[no_mangle]
pub unsafe extern "C" fn query_builder_bind_boolean(query_builder: *mut QueryBuilder, var: *const c_char, value: bool) {
let var = c_char_to_string(var);
@ -414,12 +374,7 @@ pub unsafe extern "C" fn query_builder_bind_boolean(query_builder: *mut QueryBui
query_builder.bind_value(&var, value);
}
/// Binds a `TypedValue::Double` to a `Variable` with the given name.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `QueryBuilder` is not dangling and that
/// the C string provided to `var` is valid.
/// Binds a [TypedValue::Double](mentat::TypedValue::Double) to a [Variable](mentat::Variable) with the given name.
#[no_mangle]
pub unsafe extern "C" fn query_builder_bind_double(query_builder: *mut QueryBuilder, var: *const c_char, value: f64) {
let var = c_char_to_string(var);
@ -427,13 +382,8 @@ pub unsafe extern "C" fn query_builder_bind_double(query_builder: *mut QueryBuil
query_builder.bind_value(&var, value);
}
/// Binds a `TypedValue::Instant` to a `Variable` with the given name.
/// Binds a [TypedValue::Instant](mentat::TypedValue::Instant) to a [Variable](mentat::Variable) with the given name.
/// Takes a timestamp in microseconds.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `QueryBuilder` is not dangling and that
/// the C string provided to `var` is valid.
#[no_mangle]
pub unsafe extern "C" fn query_builder_bind_timestamp(query_builder: *mut QueryBuilder, var: *const c_char, value: c_longlong) {
let var = c_char_to_string(var);
@ -441,12 +391,7 @@ pub unsafe extern "C" fn query_builder_bind_timestamp(query_builder: *mut QueryB
query_builder.bind_instant(&var, value);
}
/// Binds a `TypedValue::String` to a `Variable` with the given name.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `QueryBuilder` is not dangling and that
/// the C strings provided to `var` and `value` are valid.
/// Binds a [TypedValue::String](mentat::TypedValue::String) to a [Variable](mentat::Variable) with the given name.
#[no_mangle]
pub unsafe extern "C" fn query_builder_bind_string(query_builder: *mut QueryBuilder, var: *const c_char, value: *const c_char) {
let var = c_char_to_string(var);
@ -455,13 +400,8 @@ pub unsafe extern "C" fn query_builder_bind_string(query_builder: *mut QueryBuil
query_builder.bind_value(&var, value);
}
/// Binds a `TypedValue::Uuid` to a `Variable` with the given name.
/// Takes a UUID as a byte slice of length 16. This maps directly to the `uuid_t` C type.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `QueryBuilder` is not dangling and that
/// the C string provided to `var` is valid.
/// Binds a [TypedValue::Uuid](mentat::TypedValue::Uuid) to a [Variable](mentat::Variable) with the given name.
/// Takes a `UUID` as a byte slice of length 16. This maps directly to the `uuid_t` C type.
#[no_mangle]
pub unsafe extern "C" fn query_builder_bind_uuid(query_builder: *mut QueryBuilder, var: *const c_char, value: *mut [u8; 16]) {
let var = c_char_to_string(var);
@ -471,16 +411,14 @@ pub unsafe extern "C" fn query_builder_bind_uuid(query_builder: *mut QueryBuilde
query_builder.bind_value(&var, value);
}
/// Executes a query and returns the results as a Scalar.
/// Executes a query and returns the results as a [Scalar](mentat::QueryResults::Scalar).
///
/// # Panics
///
/// If the query executed is not structured as Scalar.
/// If the find set of the query executed is not structured `[:find ?foo . :where ...]`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `QueryBuilder` is not dangling.
///
/// Callers are responsible for managing the memory for the return value.
/// A destructor `destroy` is provided for releasing the memory for this
/// pointer type.
@ -496,16 +434,14 @@ pub unsafe extern "C" fn query_builder_execute_scalar(query_builder: *mut QueryB
Box::into_raw(Box::new(extern_result))
}
/// Executes a query and returns the results as a Coll.
/// Executes a query and returns the results as a [Coll](mentat::QueryResults::Coll).
///
/// # Panics
///
/// If the query executed is not structured as Coll.
/// If the find set of the query executed is not structured `[:find [?foo ...] :where ...]`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `QueryBuilder` is not dangling.
///
/// Callers are responsible for managing the memory for the return value.
/// A destructor `destroy` is provided for releasing the memory for this
/// pointer type.
@ -516,16 +452,14 @@ pub unsafe extern "C" fn query_builder_execute_coll(query_builder: *mut QueryBui
Box::into_raw(Box::new(results.into()))
}
/// Executes a query and returns the results as a Tuple.
/// Executes a query and returns the results as a [Tuple](mentat::QueryResults::Tuple).
///
/// # Panics
///
/// If the query executed is not structured as Tuple.
/// If the find set of the query executed is not structured `[:find [?foo ?bar] :where ...]`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `QueryBuilder` is not dangling.
///
/// Callers are responsible for managing the memory for the return value.
/// A destructor `destroy` is provided for releasing the memory for this
/// pointer type.
@ -541,16 +475,14 @@ pub unsafe extern "C" fn query_builder_execute_tuple(query_builder: *mut QueryBu
Box::into_raw(Box::new(extern_result))
}
/// Executes a query and returns the results as a Rel.
/// Executes a query and returns the results as a [Rel](mentat::QueryResults::Rel).
///
/// # Panics
///
/// If the query executed is not structured as Rel.
/// If the find set of the query executed is not structured `[:find ?foo ?bar :where ...]`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `QueryBuilder` is not dangling.
///
/// Callers are responsible for managing the memory for the return value.
/// A destructor `destroy` is provided for releasing the memory for this
/// pointer type.
@ -568,122 +500,90 @@ fn unwrap_conversion<T>(value: Option<T>, expected_type: ValueType) -> T {
}
}
/// Consumes a `TypedValue` and returns the value as a `long`.
/// Consumes a [Binding](mentat::Binding) and returns the value as a C `long`.
///
/// # Panics
///
/// If the `ValueType` of the `TypedValue` is not `ValueType::Long`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `TypedValue` is not dangling .
/// If the [ValueType](mentat::ValueType) of the [Binding](mentat::Binding) is not [ValueType::Long](mentat::ValueType::Long).
#[no_mangle]
pub unsafe extern "C" fn typed_value_as_long(typed_value: *mut Binding) -> c_longlong {
let typed_value = Box::from_raw(typed_value);
unwrap_conversion(typed_value.into_long(), ValueType::Long)
}
/// Consumes a `TypedValue` and returns the value as an `Entid`.
/// Consumes a [Binding](mentat::Binding) and returns the value as an [Entid](mentat::Entid).
///
/// # Panics
///
/// If the `ValueType` of the `TypedValue` is not `ValueType::Ref`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `TypedValue` is not dangling .
/// If the [ValueType](mentat::ValueType) of the [Binding](mentat::Binding) is not [ValueType::Long](mentat::ValueType::Ref).
#[no_mangle]
pub unsafe extern "C" fn typed_value_as_entid(typed_value: *mut Binding) -> Entid {
let typed_value = Box::from_raw(typed_value);
unwrap_conversion(typed_value.into_entid(), ValueType::Ref)
}
/// Consumes a `TypedValue` and returns the value as an keyword `String`.
/// Consumes a [Binding](mentat::Binding) and returns the value as an keyword C `String`.
///
/// # Panics
///
/// If the `ValueType` of the `TypedValue` is not `ValueType::Ref`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `TypedValue` is not dangling .
/// If the [ValueType](mentat::ValueType) of the [Binding](mentat::Binding) is not [ValueType::Long](mentat::ValueType::Ref).
#[no_mangle]
pub unsafe extern "C" fn typed_value_as_kw(typed_value: *mut Binding) -> *const c_char {
let typed_value = Box::from_raw(typed_value);
unwrap_conversion(typed_value.into_kw_c_string(), ValueType::Keyword) as *const c_char
}
/// Consumes a `TypedValue` and returns the value as a boolean represented as an `i32`.
/// Consumes a [Binding](mentat::Binding) and returns the value as a boolean represented as an `i32`.
/// If the value of the boolean is `true` the value returned is 1.
/// If the value of the boolean is `false` the value returned is 0.
///
/// # Panics
///
/// If the `ValueType` of the `TypedValue` is not `ValueType::Boolean`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `TypedValue` is not dangling .
/// If the [ValueType](mentat::ValueType) of the [Binding](mentat::Binding) is not [ValueType::Long](mentat::ValueType::Boolean).
#[no_mangle]
pub unsafe extern "C" fn typed_value_as_boolean(typed_value: *mut Binding) -> i32 {
let typed_value = Box::from_raw(typed_value);
if unwrap_conversion(typed_value.into_boolean(), ValueType::Boolean) { 1 } else { 0 }
}
/// Consumes a `TypedValue` and returns the value as a `f64`.
/// Consumes a [Binding](mentat::Binding) and returns the value as a `f64`.
///
/// # Panics
///
/// If the `ValueType` of the `TypedValue` is not `ValueType::Double`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `TypedValue` is not dangling .
/// If the [ValueType](mentat::ValueType) of the [Binding](mentat::Binding) is not [ValueType::Long](mentat::ValueType::Double).
#[no_mangle]
pub unsafe extern "C" fn typed_value_as_double(typed_value: *mut Binding) -> f64 {
let typed_value = Box::from_raw(typed_value);
unwrap_conversion(typed_value.into_double(), ValueType::Double)
}
/// Consumes a `TypedValue` and returns the value as a microsecond timestamp.
/// Consumes a [Binding](mentat::Binding) and returns the value as a microsecond timestamp.
///
/// # Panics
///
/// If the `ValueType` of the `TypedValue` is not `ValueType::Instant`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `TypedValue` is not dangling .
/// If the [ValueType](mentat::ValueType) of the [Binding](mentat::Binding) is not [ValueType::Long](mentat::ValueType::Instant).
#[no_mangle]
pub unsafe extern "C" fn typed_value_as_timestamp(typed_value: *mut Binding) -> c_longlong {
let typed_value = Box::from_raw(typed_value);
unwrap_conversion(typed_value.into_timestamp(), ValueType::Instant)
}
/// Consumes a `TypedValue` and returns the value as a `String`.
/// Consumes a [Binding](mentat::Binding) and returns the value as a C `String`.
///
/// # Panics
///
/// If the `ValueType` of the `TypedValue` is not `ValueType::String`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `TypedValue` is not dangling .
/// If the [ValueType](mentat::ValueType) of the [Binding](mentat::Binding) is not [ValueType::Long](mentat::ValueType::String).
#[no_mangle]
pub unsafe extern "C" fn typed_value_as_string(typed_value: *mut Binding) -> *const c_char {
let typed_value = Box::from_raw(typed_value);
unwrap_conversion(typed_value.into_c_string(), ValueType::String) as *const c_char
}
/// Consumes a `TypedValue` and returns the value as a UUID byte slice of length 16.
/// Consumes a [Binding](mentat::Binding) and returns the value as a UUID byte slice of length 16.
///
/// # Panics
///
/// If the `ValueType` of the `TypedValue` is not `ValueType::Uuid`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `TypedValue` is not dangling .
/// If the [ValueType](mentat::ValueType) of the [Binding](mentat::Binding) is not [ValueType::Long](mentat::ValueType::Uuid).
#[no_mangle]
pub unsafe extern "C" fn typed_value_as_uuid(typed_value: *mut Binding) -> *mut [u8; 16] {
let typed_value = Box::from_raw(typed_value);
@ -691,11 +591,7 @@ pub unsafe extern "C" fn typed_value_as_uuid(typed_value: *mut Binding) -> *mut
Box::into_raw(Box::new(*value.as_bytes()))
}
/// Returns the `ValueType` of this `TypedValue`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `TypedValue` is not dangling .
/// Returns the [ValueType](mentat::ValueType) of this [Binding](mentat::Binding).
#[no_mangle]
pub unsafe extern "C" fn typed_value_value_type(typed_value: *mut Binding) -> ValueType {
let typed_value = &*typed_value;
@ -707,8 +603,6 @@ pub unsafe extern "C" fn typed_value_value_type(typed_value: *mut Binding) -> Va
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Vec<Vec<TypedValue>>` is not dangling .
///
/// Callers are responsible for managing the memory for the return value.
/// A destructor `typed_value_result_set_destroy` is provided for releasing the memory for this
/// pointer type.
@ -718,12 +612,10 @@ pub unsafe extern "C" fn row_at_index(rows: *mut RelResult<Binding>, index: c_in
result.row(index as usize).map_or_else(std::ptr::null_mut, |v| Box::into_raw(Box::new(v.to_vec())))
}
/// Consumes the `Vec<Vec<TypedValue>>` and returns an iterator over the values.
/// Consumes the `Vec<Vec<Binding>>` and returns an iterator over the values.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Vec<Vec<TypedValue>>` is not dangling .
///
/// Callers are responsible for managing the memory for the return value.
/// A destructor `typed_value_result_set_iter_destroy` is provided for releasing the memory for this
/// pointer type.
@ -739,8 +631,6 @@ pub unsafe extern "C" fn rows_iter(rows: *mut RelResult<Binding>) -> *mut Bindin
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Vec<Vec<TypedValue>>` is not dangling .
///
/// Callers are responsible for managing the memory for the return value.
/// A destructor `typed_value_list_destroy` is provided for releasing the memory for this
/// pointer type.
@ -750,12 +640,10 @@ pub unsafe extern "C" fn rows_iter_next(iter: *mut BindingListIterator) -> *mut
iter.next().map_or(std::ptr::null_mut(), |v| Box::into_raw(Box::new(v.to_vec())))
}
/// Consumes the `Vec<TypedValue>` and returns an iterator over the values.
/// Consumes the `Vec<Binding>` and returns an iterator over the values.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Vec<TypedValue>` is not dangling .
///
/// Callers are responsible for managing the memory for the return value.
/// A destructor `typed_value_list_iter_destroy` is provided for releasing the memory for this
/// pointer type.
@ -765,13 +653,11 @@ pub unsafe extern "C" fn values_iter(values: *mut Vec<Binding>) -> *mut BindingI
Box::into_raw(Box::new(result.into_iter()))
}
/// Returns the next value in the `iter` as a `ValueType`.
/// Returns the next value in the `iter` as a [Binding](mentat::Binding).
/// If there is no value next value, a null pointer is returned.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Vec<TypedValue>` is not dangling .
///
/// Callers are responsible for managing the memory for the return value.
/// A destructor `typed_value_destroy` is provided for releasing the memory for this
/// pointer type.
@ -781,13 +667,11 @@ pub unsafe extern "C" fn values_iter_next(iter: *mut BindingIterator) -> *mut Bi
iter.next().map_or(std::ptr::null_mut(), |v| Box::into_raw(Box::new(v)))
}
/// Returns the value at the provided `index` as a `ValueType`.
/// Returns the value at the provided `index` as a [Binding](mentat::Binding).
/// If there is no value present at the `index`, a null pointer is returned.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Vec<TypedValue>` is not dangling .
///
/// Callers are responsible for managing the memory for the return value.
/// A destructor `typed_value_destroy` is provided for releasing the memory for this
/// pointer type.
@ -797,16 +681,12 @@ pub unsafe extern "C" fn value_at_index(values: *mut Vec<Binding>, index: c_int)
result.get(index as usize).expect("No value at index") as *const Binding
}
/// Returns the value of the `TypedValue` at `index` as a `long`.
/// Returns the value of the [Binding](mentat::Binding) at `index` as a `long`.
///
/// # Panics
///
/// If the `ValueType` of the `TypedValue` is not `ValueType::Long`.
/// If the [ValueType](mentat::ValueType) of the [Binding](mentat::Binding) is not `ValueType::Long`.
/// If there is no value at `index`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Vec<TypedValue>` is not dangling .
#[no_mangle]
pub unsafe extern "C" fn value_at_index_as_long(values: *mut Vec<Binding>, index: c_int) -> c_longlong {
let result = &*values;
@ -814,16 +694,12 @@ pub unsafe extern "C" fn value_at_index_as_long(values: *mut Vec<Binding>, index
unwrap_conversion(value.clone().into_long(), ValueType::Long)
}
/// Returns the value of the `TypedValue` at `index` as an `Entid`.
/// Returns the value of the [Binding](mentat::Binding) at `index` as an [Entid](mentat::Entid).
///
/// # Panics
///
/// If the `ValueType` of the `TypedValue` is not `ValueType::Ref`.
/// If the [ValueType](mentat::ValueType) of the [Binding](mentat::Binding) is not `ValueType::Ref`.
/// If there is no value at `index`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Vec<TypedValue>` is not dangling .
#[no_mangle]
pub unsafe extern "C" fn value_at_index_as_entid(values: *mut Vec<Binding>, index: c_int) -> Entid {
let result = &*values;
@ -831,16 +707,12 @@ pub unsafe extern "C" fn value_at_index_as_entid(values: *mut Vec<Binding>, inde
unwrap_conversion(value.clone().into_entid(), ValueType::Ref)
}
/// Returns the value of the `TypedValue` at `index` as a keyword `String`.
/// Returns the value of the [Binding](mentat::Binding) at `index` as a keyword C `String`.
///
/// # Panics
///
/// If the `ValueType` of the `TypedValue` is not `ValueType::Ref`.
/// If the [ValueType](mentat::ValueType) of the [Binding](mentat::Binding) is not [ValueType::Ref](mentat::ValueType::Ref).
/// If there is no value at `index`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Vec<TypedValue>` is not dangling .
#[no_mangle]
pub unsafe extern "C" fn value_at_index_as_kw(values: *mut Vec<Binding>, index: c_int) -> *const c_char {
let result = &*values;
@ -848,18 +720,14 @@ pub unsafe extern "C" fn value_at_index_as_kw(values: *mut Vec<Binding>, index:
unwrap_conversion(value.clone().into_kw_c_string(), ValueType::Keyword) as *const c_char
}
/// Returns the value of the `TypedValue` at `index` as a boolean represented by a `i32`.
/// Returns the value of the [Binding](mentat::Binding) at `index` as a boolean represented by a `i32`.
/// If the value of the `boolean` is `true` then the value returned is 1.
/// If the value of the `boolean` is `false` then the value returned is 0.
///
/// # Panics
///
/// If the `ValueType` of the `TypedValue` is not `ValueType::Long`.
/// If the [ValueType](mentat::ValueType) of the [Binding](mentat::Binding) is not [ValueType::Long](mentat::ValueType::Long).
/// If there is no value at `index`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Vec<TypedValue>` is not dangling .
#[no_mangle]
pub unsafe extern "C" fn value_at_index_as_boolean(values: *mut Vec<Binding>, index: c_int) -> i32 {
let result = &*values;
@ -867,16 +735,12 @@ pub unsafe extern "C" fn value_at_index_as_boolean(values: *mut Vec<Binding>, in
if unwrap_conversion(value.clone().into_boolean(), ValueType::Boolean) { 1 } else { 0 }
}
/// Returns the value of the `TypedValue` at `index` as an `f64`.
/// Returns the value of the [Binding](mentat::Binding) at `index` as an `f64`.
///
/// # Panics
///
/// If the `ValueType` of the `TypedValue` is not `ValueType::Double`.
/// If the [ValueType](mentat::ValueType) of the [Binding](mentat::Binding) is not [ValueType::Double](mentat::ValueType::Double).
/// If there is no value at `index`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Vec<TypedValue>` is not dangling .
#[no_mangle]
pub unsafe extern "C" fn value_at_index_as_double(values: *mut Vec<Binding>, index: c_int) -> f64 {
let result = &*values;
@ -884,16 +748,12 @@ pub unsafe extern "C" fn value_at_index_as_double(values: *mut Vec<Binding>, ind
unwrap_conversion(value.clone().into_double(), ValueType::Double)
}
/// Returns the value of the `TypedValue` at `index` as a microsecond timestamp.
/// Returns the value of the [Binding](mentat::Binding) at `index` as a microsecond timestamp.
///
/// # Panics
///
/// If the `ValueType` of the `TypedValue` is not `ValueType::instant`.
/// If the [ValueType](mentat::ValueType) of the [Binding](mentat::Binding) is not [ValueType::Instant](mentat::ValueType::Instant).
/// If there is no value at `index`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Vec<TypedValue>` is not dangling .
#[no_mangle]
pub unsafe extern "C" fn value_at_index_as_timestamp(values: *mut Vec<Binding>, index: c_int) -> c_longlong {
let result = &*values;
@ -901,16 +761,12 @@ pub unsafe extern "C" fn value_at_index_as_timestamp(values: *mut Vec<Binding>,
unwrap_conversion(value.clone().into_timestamp(), ValueType::Instant)
}
/// Returns the value of the `TypedValue` at `index` as an `String`.
/// Returns the value of the [Binding](mentat::Binding) at `index` as a C `String`.
///
/// # Panics
///
/// If the `ValueType` of the `TypedValue` is not `ValueType::String`.
/// If the [ValueType](mentat::ValueType) of the [Binding](mentat::Binding) is not [ValueType::String](mentat::ValueType::String).
/// If there is no value at `index`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Vec<TypedValue>` is not dangling .
#[no_mangle]
pub unsafe extern "C" fn value_at_index_as_string(values: *mut Vec<Binding>, index: c_int) -> *const c_char {
let result = &*values;
@ -918,16 +774,12 @@ pub unsafe extern "C" fn value_at_index_as_string(values: *mut Vec<Binding>, ind
unwrap_conversion(value.clone().into_c_string(), ValueType::String) as *const c_char
}
/// Returns the value of the `TypedValue` at `index` as a UUID byte slice of length 16.
/// Returns the value of the [Binding](mentat::Binding) at `index` as a UUID byte slice of length 16.
///
/// # Panics
///
/// If the `ValueType` of the `TypedValue` is not `ValueType::Uuid`.
/// If the [ValueType](mentat::ValueType) of the [Binding](mentat::Binding) is not [ValueType::Uuid](mentat::ValueType::Uuid).
/// If there is no value at `index`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Vec<TypedValue>` is not dangling .
#[no_mangle]
pub unsafe extern "C" fn value_at_index_as_uuid(values: *mut Vec<Binding>, index: c_int) -> *mut [u8; 16] {
let result = &*values;
@ -936,17 +788,15 @@ pub unsafe extern "C" fn value_at_index_as_uuid(values: *mut Vec<Binding>, index
Box::into_raw(Box::new(*uuid.as_bytes()))
}
/// Returns an `ExternResult` containing the `TypedValue` associated with the `attribute` as `:namespace/name`
/// Returns an [ExternResult](ExternResult) containing the [Binding](mentat::Binding) associated with the `attribute` as `:namespace/name`
/// for the given `entid`.
/// If there is a value for that `attribute` on the entity with id `entid` then the value is returned in `ok`.
/// If there no value for that `attribute` on the entity with id `entid` but the attribute is value,
/// then a null pointer is returned in `ok`.
/// If there is no `Attribute` in the `Schema` for the given `attribute` then an error is returned in `err`.
/// If there is no [Attribute](mentat::Attribute) in the [Schema](mentat::Schema) for the given `attribute` then an error is returned in `err`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Store` is not dangling .
///
/// Callers are responsible for managing the memory for the return value.
/// A destructor `destroy` is provided for releasing the memory for this
/// pointer type.
@ -967,18 +817,13 @@ pub unsafe extern "C" fn store_value_for_attribute(store: *mut Store, entid: c_l
Box::into_raw(Box::new(value))
}
/// Registers a `TxObserver` with the `key` to observe changes to `attributes`
/// Registers a [TxObserver](mentat::TxObserver) with the `key` to observe changes to `attributes`
/// on this `store`.
/// Calls `callback` is a relevant transaction occurs.
///
/// # Panics
///
/// If there is no `Attribute` in the `Schema` for a given `attribute`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Store` is not dangling, that the
/// C string in `key` is valid and that the function pointer is not dangling.
/// If there is no [Attribute](mentat::Attribute) in the [Schema](mentat::Schema) for a given `attribute`.
///
#[no_mangle]
pub unsafe extern "C" fn store_register_observer(store: *mut Store,
@ -1011,12 +856,7 @@ pub unsafe extern "C" fn store_register_observer(store: *mut Store,
store.register_observer(key, tx_observer);
}
/// Unregisters a `TxObserver` with the `key` to observe changes on this `store`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Store` is not dangling, that the
/// C string in `key` is valid.
/// Unregisters a [TxObserver](mentat::TxObserver) with the `key` to observe changes on this `store`.
#[no_mangle]
pub unsafe extern "C" fn store_unregister_observer(store: *mut Store, key: *const c_char) {
let store = &mut*store;
@ -1024,16 +864,11 @@ pub unsafe extern "C" fn store_unregister_observer(store: *mut Store, key: *cons
store.unregister_observer(&key);
}
/// Returns the `Entid` associated with the `attr` as `:namespace/name`.
/// Returns the [Entid](mentat::Entid) associated with the `attr` as `:namespace/name`.
///
/// # Panics
///
/// If there is no `Attribute` in the `Schema` for `attr`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `Store` is not dangling, that the
/// C string in `attr` is valid.
/// If there is no [Attribute](mentat::Attribute) in the [Schema](mentat::Schema) for `attr`.
#[no_mangle]
pub unsafe extern "C" fn store_entid_for_attribute(store: *mut Store, attr: *const c_char) -> Entid {
let store = &mut*store;
@ -1044,7 +879,7 @@ pub unsafe extern "C" fn store_entid_for_attribute(store: *mut Store, attr: *con
current_schema.get_entid(&kw).expect("Unable to find entid for invalid attribute").into()
}
/// Returns the value at the provided `index` as a `TransactionChange`.
/// Returns the value at the provided `index` as a [TransactionChange](TransactionChange) .
///
/// # Panics
///
@ -1052,8 +887,6 @@ pub unsafe extern "C" fn store_entid_for_attribute(store: *mut Store, attr: *con
///
/// # Safety
///
/// Callers must ensure that the pointer to the `TxChangeList` is not dangling .
///
/// Callers are responsible for managing the memory for the return value.
/// A destructor `typed_value_destroy` is provided for releasing the memory for this
/// pointer type.
@ -1065,15 +898,11 @@ pub unsafe extern "C" fn tx_change_list_entry_at(tx_report_list: *mut TxChangeLi
Box::into_raw(report)
}
/// Returns the value at the provided `index` as a `Entid`.
/// Returns the value at the provided `index` as a [Entid](mentat::Entid) .
///
/// # Panics
///
/// If there is no value present at the `index`.
///
/// # Safety
///
/// Callers must ensure that the pointer to the `TransactionChange` is not dangling .
#[no_mangle]
pub unsafe extern "C" fn changelist_entry_at(tx_report: *mut TransactionChange, index: c_int) -> Entid {
let tx_report = &*tx_report;
@ -1099,21 +928,24 @@ macro_rules! define_destructor (
)
);
/// Destructor for releasing the memory of `QueryBuilder`.
/// Destructor for releasing the memory of [QueryBuilder](mentat::QueryBuilder) .
define_destructor!(query_builder_destroy, QueryBuilder);
/// Destructor for releasing the memory of `Store`.
/// Destructor for releasing the memory of [Store](mentat::Store) .
define_destructor!(store_destroy, Store);
/// Destructor for releasing the memory of `TxReport`.
/// Destructor for releasing the memory of [TxReport](mentat::TxReport) .
define_destructor!(tx_report_destroy, TxReport);
/// Destructor for releasing the memory of [Binding](mentat::Binding).
define_destructor!(typed_value_destroy, Binding);
define_destructor!(typed_value_list_destroy, Vec<Binding>);
/// Destructor for releasing the memory of [BindingIterator](BindingIterator) .
define_destructor!(typed_value_list_iter_destroy, BindingIterator);
define_destructor!(typed_value_result_set_destroy, RelResult<Binding>);
/// Destructor for releasing the memory of [BindingListIterator](BindingListIterator) .
define_destructor!(typed_value_result_set_iter_destroy, BindingListIterator);