Do request verification in parallel, and then process the verified requests

src/accountant.rs

@@ -116,7 +116,7 @@ impl Accountant {
     }
 
     /// Process a Transaction that has already been verified.
-    fn process_verified_transaction(
+    pub fn process_verified_transaction(
         self: &mut Self,
         tr: &Transaction,
         allow_deposits: bool,

src/accountant_skel.rs

@@ -19,6 +19,7 @@ use std::thread::{spawn, JoinHandle};
 use std::time::Duration;
 use streamer;
 use transaction::Transaction;
+use rayon::prelude::*;
 
 pub struct AccountantSkel<W: Write + Send + 'static> {
     pub acc: Accountant,
@@ -34,8 +35,19 @@ pub enum Request {
     GetId { is_last: bool },
 }
 
+impl Request {
+    /// Verify the request is valid.
+    pub fn verify(&self) -> bool {
+        match *self {
+            Request::Transaction(ref tr) => tr.verify(),
+            _ => true,
+        }
+    }
+}
+
+/// Parallel verfication of a batch of requests.
 fn filter_valid_requests(reqs: Vec<(Request, SocketAddr)>) -> Vec<(Request, SocketAddr)> {
-    reqs
+    reqs.into_par_iter().filter({ |x| x.0.verify() }).collect()
 }
 
 #[derive(Serialize, Deserialize, Debug)]
@@ -66,10 +78,10 @@ impl<W: Write + Send + 'static> AccountantSkel<W> {
     }
 
     /// Process Request items sent by clients.
-    pub fn process_request(self: &mut Self, msg: Request) -> Option<Response> {
+    pub fn process_verified_request(self: &mut Self, msg: Request) -> Option<Response> {
         match msg {
             Request::Transaction(tr) => {
-                if let Err(err) = self.acc.process_transaction(tr) {
+                if let Err(err) = self.acc.process_verified_transaction(&tr, false) {
                     eprintln!("Transaction error: {:?}", err);
                 }
                 None
@@ -114,7 +126,7 @@ impl<W: Write + Send + 'static> AccountantSkel<W> {
             let mut num = 0;
             let mut ursps = rsps.write().unwrap();
             for (req, rsp_addr) in reqs {
-                if let Some(resp) = obj.lock().unwrap().process_request(req) {
+                if let Some(resp) = obj.lock().unwrap().process_verified_request(req) {
                     if ursps.responses.len() <= num {
                         ursps
                             .responses