Add DateTime and Cancel conditions

Fixes solana-labs#32, solana-labs#33

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "silk"
 description = "A silky smooth implementation of the Loom architecture"
-version = "0.3.0"
+version = "0.3.1"
 documentation = "https://docs.rs/silk"
 homepage = "http://loomprotocol.com/"
 repository = "https://github.com/loomprotocol/silk"
@@ -53,3 +53,4 @@ serde_json = "1.0.10"
 ring = "0.12.1"
 untrusted = "0.5.1"
 bincode = "1.0.0"
+chrono = { version = "0.4.0", features = ["serde"] }

src/accountant.rs

@@ -12,6 +12,7 @@ use historian::{reserve_signature, Historian};
 use std::sync::mpsc::SendError;
 use std::collections::HashMap;
 use std::result;
+use chrono::prelude::*;
 
 #[derive(Debug, PartialEq, Eq)]
 pub enum AccountingError {
@@ -138,6 +139,18 @@ impl Accountant {
         self.process_transaction(tr).map(|_| sig)
     }
 
+    pub fn transfer_on_date(
+        self: &mut Self,
+        n: i64,
+        keypair: &KeyPair,
+        to: PublicKey,
+        dt: DateTime<Utc>,
+    ) -> Result<Signature> {
+        let tr = Transaction::new_on_date(keypair, to, dt, n, self.last_id);
+        let sig = tr.sig;
+        self.process_transaction(tr).map(|_| sig)
+    }
+
     pub fn get_balance(self: &Self, pubkey: &PublicKey) -> Option<i64> {
         self.balances.get(pubkey).map(|x| *x)
     }

src/lib.rs

@@ -12,6 +12,7 @@ pub mod accountant;
 pub mod accountant_skel;
 pub mod accountant_stub;
 extern crate bincode;
+extern crate chrono;
 extern crate generic_array;
 extern crate rayon;
 extern crate ring;

src/transaction.rs

@@ -4,11 +4,20 @@ use signature::{KeyPair, KeyPairUtil, PublicKey, Signature, SignatureUtil};
 use serde::Serialize;
 use bincode::serialize;
 use hash::Hash;
+use chrono::prelude::*;
+
+#[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
+pub enum Condition {
+    DateTime(DateTime<Utc>),
+    Cancel,
+}
 
 #[derive(Serialize, Deserialize, Debug, PartialEq, Eq, Clone)]
 pub struct Transaction<T> {
     pub from: PublicKey,
     pub to: PublicKey,
+    pub if_all: Vec<Condition>,
+    pub unless_any: Vec<Condition>,
     pub asset: T,
     pub last_id: Hash,
     pub sig: Signature,
@@ -19,6 +28,28 @@ impl<T: Serialize> Transaction<T> {
         let mut tr = Transaction {
             from: from_keypair.pubkey(),
             to,
+            if_all: vec![],
+            unless_any: vec![],
+            asset,
+            last_id,
+            sig: Signature::default(),
+        };
+        tr.sign(from_keypair);
+        tr
+    }
+
+    pub fn new_on_date(
+        from_keypair: &KeyPair,
+        to: PublicKey,
+        dt: DateTime<Utc>,
+        asset: T,
+        last_id: Hash,
+    ) -> Self {
+        let mut tr = Transaction {
+            from: from_keypair.pubkey(),
+            to,
+            if_all: vec![Condition::DateTime(dt)],
+            unless_any: vec![Condition::Cancel],
             asset,
             last_id,
             sig: Signature::default(),
@@ -72,6 +103,8 @@ mod tests {
         let claim0 = Transaction {
             from: Default::default(),
             to: Default::default(),
+            if_all: Default::default(),
+            unless_any: Default::default(),
             asset: 0u8,
             last_id: Default::default(),
             sig: Default::default(),