add getActions to LocalBlockchain

src/examples/state_update_rollup.ts

@@ -10,6 +10,8 @@ import {
   Party,
   isReady,
   Permissions,
+  Circuit,
+  Ledger,
 } from 'snarkyjs';
 
 await isReady;
@@ -39,9 +41,12 @@ class CounterZkapp extends SmartContract {
 
     // compute the new counter and hash from pending actions
     // remark: it's not feasible to pass in the pending actions as method arguments, because they have dynamic size
+
     let { state: newCounter, actionsHash: newActionsHash } =
       this.reducer.reduce(
-        pendingActions,
+        this.reducer.getActions({
+          fromActionHash: actionsHash,
+        }),
         // state type
         Field,
         // function that says how to apply an action
@@ -60,12 +65,6 @@ class CounterZkapp extends SmartContract {
 const doProofs = false;
 const initialCounter = Field.zero;
 
-// this is a data structure where we internally keep track of the pending actions
-// TODO: get these from a Mina node / the local blockchain
-// note: each entry in pendingActions is itself an array -- the list of actions dispatched by one method
-// this is the structure we need to do the hashing correctly
-let pendingActions: Field[][] = [];
-
 let Local = Mina.LocalBlockchain();
 Mina.setActiveInstance(Local);
 
@@ -77,7 +76,6 @@ let zkappKey = PrivateKey.fromBase58(
   'EKEQc95PPQZnMY9d9p1vq1MWLeDJKtvKj4V75UDG3rjnf32BerWD'
 );
 let zkappAddress = zkappKey.toPublicKey();
-
 let zkapp = new CounterZkapp(zkappAddress);
 if (doProofs) {
   console.log('compile');
@@ -100,15 +98,16 @@ let tx = await Mina.transaction(feePayer, () => {
 });
 tx.send();
 
+console.log('applying actions..');
+
 console.log('action 1');
+
 tx = await Mina.transaction(feePayer, () => {
   zkapp.incrementCounter();
   if (!doProofs) zkapp.sign(zkappKey);
 });
 if (doProofs) await tx.prove();
 tx.send();
-// update internal state
-pendingActions.push([INCREMENT]);
 
 console.log('action 2');
 tx = await Mina.transaction(feePayer, () => {
@@ -117,21 +116,53 @@ tx = await Mina.transaction(feePayer, () => {
 });
 if (doProofs) await tx.prove();
 tx.send();
-// update internal state
-pendingActions.push([INCREMENT]);
 
-console.log('state (on-chain): ' + zkapp.counter.get());
-console.log('pending actions:', JSON.stringify(pendingActions));
+console.log('action 3');
+tx = await Mina.transaction(feePayer, () => {
+  zkapp.incrementCounter();
+  if (!doProofs) zkapp.sign(zkappKey);
+});
+if (doProofs) await tx.prove();
+tx.send();
+
+console.log('rolling up pending actions..');
+
+console.log('state before: ' + zkapp.counter.get());
+
+tx = await Mina.transaction(feePayer, () => {
+  zkapp.rollupIncrements();
+  if (!doProofs) zkapp.sign(zkappKey);
+});
+if (doProofs) await tx.prove();
+tx.send();
+
+console.log('state after rollup: ' + zkapp.counter.get());
+
+console.log('applying more actions');
+
+console.log('action 4');
+tx = await Mina.transaction(feePayer, () => {
+  zkapp.incrementCounter();
+  if (!doProofs) zkapp.sign(zkappKey);
+});
+tx.send();
+
+console.log('action 5');
+tx = await Mina.transaction(feePayer, () => {
+  zkapp.incrementCounter();
+  if (!doProofs) zkapp.sign(zkappKey);
+});
+tx.send();
+
+console.log('rolling up pending actions..');
+
+console.log('state before: ' + zkapp.counter.get());
 
-console.log('rollup transaction');
 tx = await Mina.transaction(feePayer, () => {
   zkapp.rollupIncrements();
   if (!doProofs) zkapp.sign(zkappKey);
 });
 if (doProofs) await tx.prove();
 tx.send();
-// reset pending actions
-pendingActions = [];
 
-console.log('state (on-chain): ' + zkapp.counter.get());
-console.log('pending actions:', JSON.stringify(pendingActions));
+console.log('state after rollup: ' + zkapp.counter.get());

src/lib/mina.ts

@@ -41,6 +41,7 @@ export {
   accountCreationFee,
   sendTransaction,
   fetchEvents,
+  getActions,
   FeePayerSpec,
 };
 interface TransactionId {
@@ -197,6 +198,10 @@ interface Mina {
   accountCreationFee(): UInt64;
   sendTransaction(transaction: Transaction): TransactionId;
   fetchEvents: (publicKey: PublicKey, tokenId?: Field) => any;
+  getActions: (
+    publicKey: PublicKey,
+    tokenId?: Field
+  ) => { hash: string; actions: string[][] }[];
 }
 
 interface MockMina extends Mina {
@@ -247,6 +252,7 @@ function LocalBlockchain({
   }
 
   const events: Record<string, any> = {};
+  const actions: Record<string, any> = {};
 
   return {
     accountCreationFee: () => UInt64.from(accountCreationFee),
@@ -318,8 +324,37 @@ function LocalBlockchain({
             slot: networkState.globalSlotSinceHardFork.toString(),
           });
         }
-      });
 
+        // actions/sequencing events
+        let latestActionsHash =
+          ledger.getAccount(
+            PublicKey.fromBase58(addr),
+            Ledger.fieldOfBase58(tokenId)
+          )?.zkapp?.sequenceState[0] ?? Events.emptySequenceState();
+
+        let actionList = p.body.sequenceEvents;
+        let eventsHash = Events.hash(
+          actionList.map((e) => e.map((f) => Field(f)))
+        );
+
+        latestActionsHash = Events.updateSequenceState(
+          latestActionsHash,
+          eventsHash
+        );
+
+        if (actions[addr] === undefined) {
+          actions[addr] = {};
+        }
+        if (p.body.sequenceEvents.length > 0) {
+          if (actions[addr][tokenId] === undefined) {
+            actions[addr][tokenId] = [];
+          }
+          actions[addr][tokenId].push({
+            actions: actionList,
+            hash: Ledger.fieldToBase58(latestActionsHash),
+          });
+        }
+      });
       return { wait: async () => {} };
     },
     async transaction(sender: FeePayerSpec, f: () => void) {
@@ -350,6 +385,14 @@ function LocalBlockchain({
     ): Promise<any[]> {
       return events?.[publicKey.toBase58()]?.[TokenId.toBase58(tokenId)] ?? [];
     },
+    getActions(
+      publicKey: PublicKey,
+      tokenId: Field = TokenId.default
+    ): { hash: string; actions: string[][] }[] {
+      return (
+        actions?.[publicKey.toBase58()]?.[Ledger.fieldToBase58(tokenId)] ?? []
+      );
+    },
     addAccount,
     testAccounts,
     setTimestamp(ms: UInt64) {
@@ -477,6 +520,11 @@ function RemoteBlockchain(graphqlEndpoint: string): Mina {
         'fetchEvents() is not implemented yet for remote blockchains.'
       );
     },
+    getActions() {
+      throw Error(
+        'fetchEvents() is not implemented yet for remote blockchains.'
+      );
+    },
   };
 }
 
@@ -543,6 +591,9 @@ let activeInstance: Mina = {
   fetchEvents() {
     throw Error('must call Mina.setActiveInstance first');
   },
+  getActions() {
+    throw Error('must call Mina.setActiveInstance first');
+  },
 };
 
 /**
@@ -630,6 +681,13 @@ async function fetchEvents(publicKey: PublicKey, tokenId: Field) {
   return await activeInstance.fetchEvents(publicKey, tokenId);
 }
 
+/**
+ * @return A list of emitted sequencing actions associated to the given public key.
+ */
+function getActions(publicKey: PublicKey, tokenId: Field) {
+  return activeInstance.getActions(publicKey, tokenId);
+}
+
 function dummyAccount(pubkey?: PublicKey): Account {
   return {
     balance: UInt64.zero,

src/lib/zkapp.ts

@@ -731,6 +731,13 @@ type ReducerReturn<Action> = {
     state: State;
     actionsHash: Field;
   };
+  getActions({
+    fromActionHash,
+    endActionHash,
+  }: {
+    fromActionHash?: Field;
+    endActionHash?: Field;
+  }): Action[][];
 };
 
 function getReducer<A>(contract: SmartContract): ReducerReturn<A> {
@@ -826,6 +833,56 @@ Use the optional \`maxTransactionsWithActions\` argument to increase this number
       contract.account.sequenceState.assertEquals(actionsHash);
       return { state, actionsHash };
     },
+    getActions({
+      fromActionHash,
+      endActionHash,
+    }: {
+      fromActionHash?: Field;
+      endActionHash?: Field;
+    }): A[][] {
+      let actionsForAccount: A[][] = [];
+
+      Circuit.asProver(() => {
+        // if the fromActionHash is the empty state, we fetch all events
+        fromActionHash = fromActionHash
+          ?.equals(Events.emptySequenceState())
+          .toBoolean()
+          ? undefined
+          : fromActionHash;
+
+        // used to determine start and end values in string
+        let start: string | undefined = fromActionHash
+          ? Ledger.fieldToBase58(fromActionHash)
+          : undefined;
+        let end: string | undefined = endActionHash
+          ? Ledger.fieldToBase58(endActionHash)
+          : undefined;
+
+        let actions = Mina.getActions(contract.address, contract.self.tokenId);
+
+        // gets the start/end indices of our array slice
+        let startIndex = start
+          ? actions.findIndex((e) => e.hash === start) + 2
+          : 0;
+        let endIndex = end
+          ? actions.findIndex((e) => e.hash === end) + 1
+          : undefined;
+
+        // slices the array so we only get the wanted range between fromActionHash and endActionHash
+        actionsForAccount = actions
+          .slice(startIndex, endIndex === 0 ? undefined : endIndex)
+          .map((event: { hash: string; actions: string[][] }) =>
+            event.actions.map((action: string[]) =>
+              reducer.actionType.ofFields(
+                action.map((fieldAsString: string) =>
+                  Field.fromString(fieldAsString)
+                )
+              )
+            )
+          );
+      });
+      return actionsForAccount;
+    },
   };
 }