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use crate::manager::{RequestManager, RequestStatus};
use crate::transport::Sender as WsSender;
use futures::channel::mpsc;
use jsonrpsee_types::v2::params::{Id, JsonRpcParams, SubscriptionId};
use jsonrpsee_types::v2::parse_request_id;
use jsonrpsee_types::v2::request::JsonRpcCallSer;
use jsonrpsee_types::v2::response::{JsonRpcNotifResponse, JsonRpcResponse};
use jsonrpsee_types::{v2::error::JsonRpcErrorAlloc, Error, RequestMessage};
use serde_json::Value as JsonValue;
/// Attempts to process a batch response.
///
/// On success the result is sent to the frontend.
pub fn process_batch_response(manager: &mut RequestManager, rps: Vec<JsonRpcResponse<JsonValue>>) -> Result<(), Error> {
let mut digest = Vec::with_capacity(rps.len());
let mut ordered_responses = vec![JsonValue::Null; rps.len()];
let mut rps_unordered: Vec<_> = Vec::with_capacity(rps.len());
for rp in rps {
let id = parse_request_id(rp.id)?;
digest.push(id);
rps_unordered.push((id, rp.result));
}
digest.sort_unstable();
let batch_state = match manager.complete_pending_batch(digest) {
Some(state) => state,
None => {
log::warn!("Received unknown batch response");
return Err(Error::InvalidRequestId);
}
};
for (id, rp) in rps_unordered {
let pos =
batch_state.order.get(&id).copied().expect("All request IDs valid checked by RequestManager above; qed");
ordered_responses[pos] = rp;
}
let _ = batch_state.send_back.send(Ok(ordered_responses));
Ok(())
}
/// Attempts to process a subscription response.
///
/// Returns `Ok()` if the response was successfully sent to the frontend.
/// Return `Err(None)` if the subscription was not found.
/// Returns `Err(Some(msg))` if the subscription was full.
pub fn process_subscription_response(
manager: &mut RequestManager,
notif: JsonRpcNotifResponse<JsonValue>,
) -> Result<(), Option<RequestMessage>> {
let sub_id = notif.params.subscription;
let request_id = match manager.get_request_id_by_subscription_id(&sub_id) {
Some(request_id) => request_id,
None => return Err(None),
};
match manager.as_subscription_mut(&request_id) {
Some(send_back_sink) => match send_back_sink.try_send(notif.params.result) {
Ok(()) => Ok(()),
Err(err) => {
log::error!("Dropping subscription {:?} error: {:?}", sub_id, err);
let msg = build_unsubscribe_message(manager, request_id, sub_id)
.expect("request ID and subscription ID valid checked above; qed");
Err(Some(msg))
}
},
None => {
log::error!("Subscription ID: {:?} not an active subscription", sub_id);
Err(None)
}
}
}
/// Process a response from the server.
///
/// Returns `Ok(None)` if the response was successfully sent.
/// Returns `Ok(Some(_))` if the response got an error but could be handled.
/// Returns `Err(_)` if the response couldn't be handled.
pub fn process_single_response(
manager: &mut RequestManager,
response: JsonRpcResponse<JsonValue>,
max_capacity_per_subscription: usize,
) -> Result<Option<RequestMessage>, Error> {
let response_id = parse_request_id(response.id)?;
match manager.request_status(&response_id) {
RequestStatus::PendingMethodCall => {
let send_back_oneshot = match manager.complete_pending_call(response_id) {
Some(Some(send)) => send,
Some(None) => return Ok(None),
None => return Err(Error::InvalidRequestId),
};
let _ = send_back_oneshot.send(Ok(response.result));
Ok(None)
}
RequestStatus::PendingSubscription => {
let (unsub_id, send_back_oneshot, unsubscribe_method) =
manager.complete_pending_subscription(response_id).ok_or(Error::InvalidRequestId)?;
let sub_id: SubscriptionId = match serde_json::from_value(response.result) {
Ok(sub_id) => sub_id,
Err(_) => {
let _ = send_back_oneshot.send(Err(Error::InvalidSubscriptionId));
return Ok(None);
}
};
let (subscribe_tx, subscribe_rx) = mpsc::channel(max_capacity_per_subscription);
if manager
.insert_subscription(response_id, unsub_id, sub_id.clone(), subscribe_tx, unsubscribe_method)
.is_ok()
{
match send_back_oneshot.send(Ok((subscribe_rx, sub_id.clone()))) {
Ok(_) => Ok(None),
Err(_) => Ok(build_unsubscribe_message(manager, response_id, sub_id)),
}
} else {
let _ = send_back_oneshot.send(Err(Error::InvalidSubscriptionId));
Ok(None)
}
}
RequestStatus::Subscription | RequestStatus::Invalid => Err(Error::InvalidRequestId),
}
}
/// Sends an unsubscribe to request to server to indicate
/// that the client is not interested in the subscription anymore.
//
// NOTE: we don't count this a concurrent request as it's part of a subscription.
pub async fn stop_subscription(sender: &mut WsSender, manager: &mut RequestManager, unsub: RequestMessage) {
if let Err(e) = sender.send(unsub.raw).await {
log::error!("Send unsubscribe request failed: {:?}", e);
let _ = manager.complete_pending_call(unsub.id);
}
}
/// Builds an unsubscription message.
pub fn build_unsubscribe_message(
manager: &mut RequestManager,
sub_req_id: u64,
sub_id: SubscriptionId,
) -> Option<RequestMessage> {
let (unsub_req_id, _, unsub, sub_id) = manager.remove_subscription(sub_req_id, sub_id)?;
let sub_id_slice: &[JsonValue] = &[sub_id.into()];
// TODO: https://github.com/paritytech/jsonrpsee/issues/275
let params = JsonRpcParams::ArrayRef(sub_id_slice);
let raw = serde_json::to_string(&JsonRpcCallSer::new(Id::Number(unsub_req_id), &unsub, params)).ok()?;
Some(RequestMessage { raw, id: unsub_req_id, send_back: None })
}
/// Attempts to process an error response.
///
/// Returns `Ok` if the response was successfully sent.
/// Returns `Err(_)` if the response ID was not found.
pub fn process_error_response(manager: &mut RequestManager, err: JsonRpcErrorAlloc) -> Result<(), Error> {
let id = err.id.as_number().copied().ok_or(Error::InvalidRequestId)?;
match manager.request_status(&id) {
RequestStatus::PendingMethodCall => {
let send_back = manager.complete_pending_call(id).expect("State checked above; qed");
let _ = send_back.map(|s| s.send(Err(Error::Request(err))));
Ok(())
}
RequestStatus::PendingSubscription => {
let (_, send_back, _) = manager.complete_pending_subscription(id).expect("State checked above; qed");
let _ = send_back.send(Err(Error::Request(err)));
Ok(())
}
_ => Err(Error::InvalidRequestId),
}
}