spl: Add prune ix to dex middleware (#543)

Cargo.lock

@@ -192,6 +192,7 @@ dependencies = [
  "bytemuck",
  "solana-program",
  "thiserror",
+ "zeroize",
 ]
 
 [[package]]
@@ -2811,7 +2812,7 @@ dependencies = [
 [[package]]
 name = "serum_dex"
 version = "0.3.1"
-source = "git+https://github.com/project-serum/serum-dex?branch=armani/auth#2037a646f82e689f8e7a00c8a34b30e20253ba11"
+source = "git+https://github.com/project-serum/serum-dex?branch=armani/auth#814c1fd05b00ae99d68d8f9617cc3868b7aceae1"
 dependencies = [
  "arrayref",
  "bincode",
@@ -4359,9 +4360,9 @@ checksum = "9fc79f4a1e39857fc00c3f662cbf2651c771f00e9c15fe2abc341806bd46bd71"
 
 [[package]]
 name = "zeroize"
-version = "1.2.0"
+version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "81a974bcdd357f0dca4d41677db03436324d45a4c9ed2d0b873a5a360ce41c36"
+checksum = "4756f7db3f7b5574938c3eb1c117038b8e07f95ee6718c0efad4ac21508f1efd"
 dependencies = [
  "zeroize_derive",
 ]

examples/permissioned-markets/deps/serum-dex

@@ -1 +1 @@
-Subproject commit 2037a646f82e689f8e7a00c8a34b30e20253ba11
+Subproject commit 814c1fd05b00ae99d68d8f9617cc3868b7aceae1

spl/src/dex/middleware.rs

@@ -75,6 +75,10 @@ pub trait MarketMiddleware {
         Ok(())
     }
 
+    fn prune(&self, _ctx: &mut Context) -> ProgramResult {
+        Ok(())
+    }
+
     /// Called when the instruction data doesn't match any DEX instruction.
     fn fallback(&self, _ctx: &mut Context) -> ProgramResult {
         Ok(())
@@ -344,6 +348,20 @@ impl MarketMiddleware for OpenOrdersPda {
 
         Ok(())
     }
+
+    /// Accounts:
+    ///
+    /// ..
+    ///
+    /// Data:
+    ///
+    /// 0.   Discriminant.
+    /// ..
+    fn prune(&self, ctx: &mut Context) -> ProgramResult {
+        // Set owner of open orders to be itself.
+        ctx.accounts[5] = ctx.accounts[4].clone();
+        Ok(())
+    }
 }
 
 /// Logs each request.
@@ -471,7 +489,7 @@ macro_rules! open_orders_init_authority {
 
 // Errors.
 
-#[error]
+#[error(offset = 500)]
 pub enum ErrorCode {
     #[msg("Program ID does not match the Serum DEX")]
     InvalidDexPid,

spl/src/dex/proxy.rs

@@ -95,6 +95,12 @@ impl<'a> MarketProxy<'a> {
                     mw.close_open_orders(&mut ctx)?;
                 }
             }
+            Some(MarketInstruction::Prune) => {
+                require!(ctx.accounts.len() >= 7, ErrorCode::NotEnoughAccounts);
+                for mw in &self.middlewares {
+                    mw.prune(&mut ctx)?;
+                }
+            }
             _ => {
                 for mw in &self.middlewares {
                     mw.fallback(&mut ctx)?;