refactor: timestamp as u64 instead of a Field

noir-projects/aztec-nr/aztec/src/context/avm_context.nr

@@ -78,7 +78,7 @@ impl PublicContextInterface for AVMContext {
         block_number()
     }
 
-    fn timestamp(self) -> Field {
+    fn timestamp(self) -> u64 {
         timestamp()
     }
 
@@ -238,7 +238,7 @@ fn version() -> Field {}
 fn block_number() -> Field {}
 
 #[oracle(avmOpcodeTimestamp)]
-fn timestamp() -> Field {}
+fn timestamp() -> u64 {}
 
 #[oracle(avmOpcodeNoteHashExists)]
 fn note_hash_exists(note_hash: Field, leaf_index: Field) -> u8 {}

noir-projects/aztec-nr/aztec/src/context/interface.nr

@@ -21,7 +21,7 @@ trait ContextInterface {
 // If you are adding something here, then you should also implement it in the AVMContext.
 trait PublicContextInterface {
     fn block_number(self) -> Field;
-    fn timestamp(self) -> Field;
+    fn timestamp(self) -> u64;
     fn coinbase(self) -> EthAddress;
     fn fee_recipient(self) -> AztecAddress;
     fn push_nullifier_read_request(&mut self, nullifier: Field);

noir-projects/aztec-nr/aztec/src/context/public_context.nr

@@ -204,7 +204,7 @@ impl PublicContextInterface for PublicContext {
         self.inputs.public_global_variables.block_number
     }
 
-    fn timestamp(self) -> Field {
+    fn timestamp(self) -> u64 {
         self.inputs.public_global_variables.timestamp
     }
 

noir-projects/aztec-nr/slow-updates-tree/src/slow_map.nr

@@ -46,7 +46,7 @@ impl<N,M> SlowMap<N,M> {
 
     // Reads the "CURRENT" value of the root
     pub fn current_root(self: Self) -> Field {
-        let time = self.context.public.unwrap().timestamp() as u64;
+        let time = self.context.public.unwrap().timestamp();
         let root_object = self.read_root();
         if time <= root_object.next_change as u64 {
             root_object.before
@@ -66,7 +66,7 @@ impl<N,M> SlowMap<N,M> {
     // docs:start:read_at
     // Reads the "CURRENT" value of the leaf
     pub fn read_at(self: Self, key: Field) -> Field {
-        let time = self.context.public.unwrap().timestamp() as u64;
+        let time = self.context.public.unwrap().timestamp();
         let leaf = self.read_leaf_at(key);
         if time <= leaf.next_change as u64 {
             leaf.before
@@ -87,7 +87,7 @@ impl<N,M> SlowMap<N,M> {
         // The calling function should ensure that the index is within the tree.
         // This must be done separately to ensure we are not constraining too tight here.
 
-        let time = self.context.public.unwrap().timestamp() as u64;
+        let time = self.context.public.unwrap().timestamp();
         let next_change = compute_next_change(time as Field);
 
         let mut root = self.read_root();
@@ -132,7 +132,7 @@ impl<N,M> SlowMap<N,M> {
     // in public, limiting the cost of the update.
     pub fn update_unsafe_at(self: Self, index: Field, leaf_value: Field, new_root: Field) {
         // User must ensure that the checks from update_at is performed for safety
-        let time = self.context.public.unwrap().timestamp() as u64;
+        let time = self.context.public.unwrap().timestamp();
         let next_change = compute_next_change(time as Field);
 
         let mut root = self.read_root();

noir-projects/noir-contracts/contracts/avm_test_contract/src/main.nr

@@ -223,7 +223,7 @@ contract AvmTest {
     }
 
     #[aztec(public-vm)]
-    fn get_timestamp() -> pub Field {
+    fn get_timestamp() -> pub u64 {
         context.timestamp()
     }
 

noir-projects/noir-contracts/contracts/child_contract/src/main.nr

@@ -33,7 +33,7 @@ contract Child {
             + context.chain_id()
             + context.version()
             + context.block_number()
-            + context.timestamp();
+            + context.timestamp() as Field;
 
         return_value
     }

noir-projects/noir-contracts/contracts/crowdfunding_contract/src/main.nr

@@ -44,7 +44,7 @@ contract Crowdfunding {
     #[aztec(internal)]
     fn _check_deadline() {
         let deadline = storage.deadline.read();
-        assert(context.timestamp() as u64 < deadline, "Deadline has passed");
+        assert(context.timestamp() < deadline, "Deadline has passed");
     }
 
     #[aztec(private)]

noir-projects/noir-contracts/contracts/lending_contract/src/main.nr

@@ -56,7 +56,7 @@ contract Lending {
         assert(asset.last_updated_ts == 0);
         assert(asset.interest_accumulator == U128::from_integer(0));
 
-        let last_updated_ts = context.timestamp() as u64;
+        let last_updated_ts = context.timestamp();
 
         asset_loc.write(
             Asset { interest_accumulator: U128::from_integer(1000000000), last_updated_ts, loan_to_value, oracle }
@@ -72,7 +72,7 @@ contract Lending {
         let asset_loc = storage.assets.at(0);
         let mut asset = asset_loc.read();
 
-        let timestamp = context.timestamp() as u64;
+        let timestamp = context.timestamp();
         let dt = timestamp - asset.last_updated_ts;
 
         // Only update if time has passed.
@@ -84,7 +84,7 @@ contract Lending {
 
             // accumulator *= multiplier, and multiplier >= 1
             asset.interest_accumulator = (asset.interest_accumulator * multiplier) / precision;
-            asset.last_updated_ts = context.timestamp() as u64;
+            asset.last_updated_ts = context.timestamp();
 
             asset_loc.write(asset);
         }

noir-projects/noir-contracts/contracts/test_contract/src/main.nr

@@ -261,7 +261,7 @@ contract Test {
 
     // docs:start:is-time-equal
     #[aztec(public)]
-    fn is_time_equal(time: Field) -> Field {
+    fn is_time_equal(time: u64) -> u64 {
         assert(context.timestamp() == time);
         time
     }
@@ -334,7 +334,7 @@ contract Test {
         chain_id: Field,
         version: Field,
         block_number: Field,
-        timestamp: Field,
+        timestamp: u64,
         coinbase: EthAddress,
         fee_recipient: AztecAddress
     ) {

noir-projects/noir-protocol-circuits/crates/types/src/abis/global_variables.nr

@@ -10,7 +10,7 @@ struct GlobalVariables {
     chain_id : Field,
     version : Field,
     block_number : Field,
-    timestamp : Field,
+    timestamp : u64,
     coinbase : EthAddress,
     fee_recipient : AztecAddress,
 }
@@ -22,7 +22,7 @@ impl Serialize<GLOBAL_VARIABLES_LENGTH> for GlobalVariables {
             self.chain_id,
             self.version,
             self.block_number,
-            self.timestamp,
+            self.timestamp as Field,
             self.coinbase.to_field(),
             self.fee_recipient.to_field(),
         ]
@@ -35,7 +35,7 @@ impl Deserialize<GLOBAL_VARIABLES_LENGTH> for GlobalVariables {
             chain_id: serialized[0],
             version: serialized[1],
             block_number: serialized[2],
-            timestamp: serialized[3],
+            timestamp: serialized[3] as u64,
             coinbase: EthAddress::from_field(serialized[4]),
             fee_recipient: AztecAddress::from_field(serialized[5]),
         }