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Document message-queue RPC methods

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Luke Parker 2023-07-16 20:53:58 -04:00
parent a9072e6b1b
commit 8543487db2
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1 changed files with 29 additions and 2 deletions
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31
message-queue/src/main.rs
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@ -24,6 +24,19 @@ lazy_static::lazy_static! {
}
// queue RPC method
/*
Queues a message to be delivered from a processor to a coordinator, or vice versa.
Messages are authenticated to be coming from the claimed service. Recipient services SHOULD
independently verify signatures.
The metadata specifies an intent. Only one message, for a specified intent, will be delivered.
This allows services to safely send messages multiple times without them being delivered multiple
times.
The message will be ordered by this service, with the order having no guarantees other than
successful ordering by the time this call returns.
*/
fn queue_message(meta: Metadata, msg: Vec<u8>, sig: SchnorrSignature<Ristretto>) {
{
let from = (*KEYS).read().unwrap()[&meta.from];
@ -33,7 +46,7 @@ fn queue_message(meta: Metadata, msg: Vec<u8>, sig: SchnorrSignature<Ristretto>)
// Assert one, and only one of these, is the coordinator
assert!(matches!(meta.from, Service::Coordinator) ^ matches!(meta.to, Service::Coordinator));
// TODO: Verify the intent hasn't been prior seen
// TODO: Verify (from, intent) hasn't been prior seen
// Queue it
(*QUEUES).read().unwrap()[&meta.to].write().unwrap().queue_message(QueuedMessage {
@ -43,7 +56,17 @@ fn queue_message(meta: Metadata, msg: Vec<u8>, sig: SchnorrSignature<Ristretto>)
});
}
// get RPC method
// next RPC method
/*
Gets the next message in queue for this service.
This is not authenticated due to the fact every nonce would have to be saved to prevent replays,
or a challenge-response protocol implemented. Neither are worth doing when there should be no
sensitive data on this server.
The expected index is used to ensure a service didn't fall out of sync with this service. It
should always be either the next message's ID or *TODO*.
*/
fn get_next_message(service: Service, _expected: u64) -> Option<QueuedMessage> {
// TODO: Verify the expected next message ID matches
@ -54,6 +77,10 @@ fn get_next_message(service: Service, _expected: u64) -> Option<QueuedMessage> {
}
// ack RPC method
/*
Acknowledges a message as received and handled, meaning it'll no longer be returned as the next
message.
*/
fn ack_message(service: Service, id: u64, _signature: SchnorrSignature<Ristretto>) {
// TODO: Verify the signature