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use crate::error::bad_resource_id;
use crate::error::type_error;
use crate::error::AnyError;
use crate::gotham_state::GothamState;
use crate::resources::ResourceTable;
use crate::runtime::GetErrorClassFn;
use crate::BufVec;
use crate::ZeroCopyBuf;
use futures::Future;
use indexmap::IndexMap;
use serde_json::json;
use serde_json::Value;
use std::cell::RefCell;
use std::collections::HashMap;
use std::iter::once;
use std::ops::Deref;
use std::ops::DerefMut;
use std::pin::Pin;
use std::rc::Rc;
pub type OpAsyncFuture = Pin<Box<dyn Future<Output = Box<[u8]>>>>;
pub type OpFn = dyn Fn(Rc<RefCell<OpState>>, BufVec) -> Op + 'static;
pub type OpId = usize;
pub enum Op {
Sync(Box<[u8]>),
Async(OpAsyncFuture),
AsyncUnref(OpAsyncFuture),
NotFound,
}
pub struct OpState {
pub resource_table: ResourceTable,
pub op_table: OpTable,
pub get_error_class_fn: GetErrorClassFn,
gotham_state: GothamState,
}
impl OpState {
pub(crate) fn new() -> OpState {
OpState {
resource_table: Default::default(),
op_table: OpTable::default(),
get_error_class_fn: &|_| "Error",
gotham_state: Default::default(),
}
}
}
impl Deref for OpState {
type Target = GothamState;
fn deref(&self) -> &Self::Target {
&self.gotham_state
}
}
impl DerefMut for OpState {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.gotham_state
}
}
pub struct OpTable(IndexMap<String, Rc<OpFn>>);
impl OpTable {
pub fn register_op<F>(&mut self, name: &str, op_fn: F) -> OpId
where
F: Fn(Rc<RefCell<OpState>>, BufVec) -> Op + 'static,
{
let (op_id, prev) = self.0.insert_full(name.to_owned(), Rc::new(op_fn));
assert!(prev.is_none());
op_id
}
pub fn route_op(
op_id: OpId,
state: Rc<RefCell<OpState>>,
bufs: BufVec,
) -> Op {
if op_id == 0 {
let ops: HashMap<String, OpId> =
state.borrow().op_table.0.keys().cloned().zip(0..).collect();
let buf = serde_json::to_vec(&ops).map(Into::into).unwrap();
Op::Sync(buf)
} else {
let op_fn = state
.borrow()
.op_table
.0
.get_index(op_id)
.map(|(_, op_fn)| op_fn.clone());
match op_fn {
Some(f) => (f)(state, bufs),
None => Op::NotFound,
}
}
}
}
impl Default for OpTable {
fn default() -> Self {
fn dummy(_state: Rc<RefCell<OpState>>, _bufs: BufVec) -> Op {
unreachable!()
}
Self(once(("ops".to_owned(), Rc::new(dummy) as _)).collect())
}
}
pub fn op_resources(
state: &mut OpState,
_args: Value,
_zero_copy: &mut [ZeroCopyBuf],
) -> Result<Value, AnyError> {
let serialized_resources: HashMap<u32, String> = state
.resource_table
.names()
.map(|(rid, name)| (rid, name.to_string()))
.collect();
Ok(json!(serialized_resources))
}
pub fn op_close(
state: &mut OpState,
args: Value,
_zero_copy: &mut [ZeroCopyBuf],
) -> Result<Value, AnyError> {
let rid = args
.get("rid")
.and_then(Value::as_u64)
.ok_or_else(|| type_error("missing or invalid `rid`"))?;
state
.resource_table
.close(rid as u32)
.ok_or_else(bad_resource_id)?;
Ok(json!({}))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn op_table() {
let state = Rc::new(RefCell::new(OpState::new()));
let foo_id;
let bar_id;
{
let op_table = &mut state.borrow_mut().op_table;
foo_id = op_table.register_op("foo", |_, _| Op::Sync(b"oof!"[..].into()));
assert_eq!(foo_id, 1);
bar_id = op_table.register_op("bar", |_, _| Op::Sync(b"rab!"[..].into()));
assert_eq!(bar_id, 2);
}
let foo_res = OpTable::route_op(foo_id, state.clone(), Default::default());
assert!(matches!(foo_res, Op::Sync(buf) if &*buf == b"oof!"));
let bar_res = OpTable::route_op(bar_id, state.clone(), Default::default());
assert!(matches!(bar_res, Op::Sync(buf) if &*buf == b"rab!"));
let catalog_res = OpTable::route_op(0, state, Default::default());
let mut catalog_entries = match catalog_res {
Op::Sync(buf) => serde_json::from_slice::<HashMap<String, OpId>>(&buf)
.map(|map| map.into_iter().collect::<Vec<_>>())
.unwrap(),
_ => panic!("unexpected `Op` variant"),
};
catalog_entries.sort_by(|(_, id1), (_, id2)| id1.partial_cmp(id2).unwrap());
assert_eq!(
catalog_entries,
vec![
("ops".to_owned(), 0),
("foo".to_owned(), 1),
("bar".to_owned(), 2)
]
);
}
}