fix: trying to fix some heap problems

src/__tests__/integration/internal-writes/internal-write-callee.test.ts

@@ -278,10 +278,14 @@ describe('Testing internal writes', () => {
     });
 
     it('should write to cache at the end of interaction (if interaction with other contracts)', async () => {
-      await calleeContract.writeInteraction({ function: 'addAndWrite', contractId: callingContract.txId(), amount: 1 });
       await calleeContract.writeInteraction({ function: 'add' });
       await mineBlock(warp);
 
+      // this writeInteraction will cause the state with the previous 'add' to be added the cache
+      // - hence the 7 (not 6) entries in the cache at the end of this test
+      await calleeContract.writeInteraction({ function: 'addAndWrite', contractId: callingContract.txId(), amount: 1 });
+      await mineBlock(warp);
+
       await calleeContract.readState();
       const entries2 = await currentContractEntries(calleeContract.txId());
       expect(entries2.length).toEqual(7);

src/__tests__/unit/evaluation-options.test.ts

@@ -1,16 +1,18 @@
 import { EvaluationOptionsEvaluator } from '../../contract/EvaluationOptionsEvaluator';
 import { WarpFactory } from '../../core/WarpFactory';
 import { SourceType } from '../../core/modules/impl/WarpGatewayInteractionsLoader';
+import { DefaultEvaluationOptions } from '../../core/modules/StateEvaluator';
 
 describe('Evaluation options evaluator', () => {
   const warp = WarpFactory.forLocal();
 
   it('should properly set root evaluation options', async () => {
     const contract = warp.contract(null);
+    const defEvalOptions = new DefaultEvaluationOptions();
 
     expect(new EvaluationOptionsEvaluator(contract.evaluationOptions(), {}).rootOptions).toEqual({
       allowBigInt: false,
-      cacheEveryNInteractions: -1,
+      cacheEveryNInteractions: defEvalOptions.cacheEveryNInteractions,
       gasLimit: 9007199254740991,
       ignoreExceptions: true,
       internalWrites: false,
@@ -48,7 +50,7 @@ describe('Evaluation options evaluator', () => {
       }).rootOptions
     ).toEqual({
       allowBigInt: true,
-      cacheEveryNInteractions: -1,
+      cacheEveryNInteractions: defEvalOptions.cacheEveryNInteractions,
       gasLimit: 3453453,
       ignoreExceptions: true,
       internalWrites: true,
@@ -81,7 +83,7 @@ describe('Evaluation options evaluator', () => {
 
     expect(new EvaluationOptionsEvaluator(contract2.evaluationOptions(), {}).rootOptions).toEqual({
       allowBigInt: false,
-      cacheEveryNInteractions: -1,
+      cacheEveryNInteractions: defEvalOptions.cacheEveryNInteractions,
       gasLimit: 2222,
       ignoreExceptions: true,
       internalWrites: true,
@@ -111,7 +113,7 @@ describe('Evaluation options evaluator', () => {
       }).rootOptions
     ).toEqual({
       allowBigInt: false,
-      cacheEveryNInteractions: -1,
+      cacheEveryNInteractions: defEvalOptions.cacheEveryNInteractions,
       gasLimit: 2222,
       ignoreExceptions: true,
       internalWrites: false,
@@ -141,7 +143,7 @@ describe('Evaluation options evaluator', () => {
       }).rootOptions
     ).toEqual({
       allowBigInt: false,
-      cacheEveryNInteractions: -1,
+      cacheEveryNInteractions: defEvalOptions.cacheEveryNInteractions,
       gasLimit: 2222,
       ignoreExceptions: true,
       internalWrites: true,
@@ -171,7 +173,7 @@ describe('Evaluation options evaluator', () => {
       }).rootOptions
     ).toEqual({
       allowBigInt: false,
-      cacheEveryNInteractions: -1,
+      cacheEveryNInteractions: defEvalOptions.cacheEveryNInteractions,
       gasLimit: 2222,
       ignoreExceptions: true,
       internalWrites: true,

src/common/SimpleLRUCache.ts

@@ -0,0 +1,42 @@
+export class SimpleLRUCache<K, V> {
+  private readonly cache: Map<K, V>;
+  private readonly capacity: number;
+  constructor(capacity: number) {
+    this.cache = new Map<K, V>();
+    this.capacity = capacity || 10;
+  }
+
+  has(key: K) {
+    return this.cache.has(key);
+  }
+
+  size(): number {
+    return this.cache.size;
+  }
+
+  get(key: K): V {
+    if (!this.cache.has(key)) return null;
+
+    const val = this.cache.get(key);
+
+    this.cache.delete(key);
+    this.cache.set(key, val);
+
+    return val;
+  }
+
+  set(key: K, value: V) {
+    this.cache.delete(key);
+
+    if (this.cache.size === this.capacity) {
+      this.cache.delete(this.cache.keys().next().value);
+      this.cache.set(key, value);
+    } else {
+      this.cache.set(key, value);
+    }
+  }
+
+  keys(): K[] {
+    return Array.from(this.cache.keys());
+  }
+}

src/contract/Contract.ts

@@ -253,4 +253,6 @@ export interface Contract<State = unknown> {
   getStorageValues(keys: string[]): Promise<SortKeyCacheResult<Map<string, unknown>>>;
 
   interactionState(): InteractionState;
+
+  clearChildren(): void;
 }

src/contract/HandlerBasedContract.ts

@@ -1046,4 +1046,11 @@ export class HandlerBasedContract<State> implements Contract<State> {
 
     this.logger.debug('Tags with inner calls', tags);
   }
+
+  clearChildren(): void {
+    for (const child of this._children) {
+      child.clearChildren();
+    }
+    this._children = [];
+  }
 }

src/contract/states/ContractInteractionState.ts

@@ -4,9 +4,10 @@ import { EvalStateResult } from '../../core/modules/StateEvaluator';
 import { GQLNodeInterface } from '../../legacy/gqlResult';
 import { Warp } from '../../core/Warp';
 import { SortKeyCacheRangeOptions } from '../../cache/SortKeyCacheRangeOptions';
+import { SimpleLRUCache } from '../../common/SimpleLRUCache';
 
 export class ContractInteractionState implements InteractionState {
-  private readonly _json = new Map<string, Map<string, EvalStateResult<unknown>>>();
+  private readonly _json = new Map<string, SimpleLRUCache<string, EvalStateResult<unknown>>>();
   private readonly _initialJson = new Map<string, EvalStateResult<unknown>>();
   private readonly _kv = new Map<string, SortKeyCache<unknown>>();
 
@@ -22,8 +23,8 @@ export class ContractInteractionState implements InteractionState {
 
   getLessOrEqual(contractTxId: string, sortKey?: string): SortKeyCacheResult<EvalStateResult<unknown>> | null {
     const states = this._json.get(contractTxId);
-    if (states != null && states.size > 0) {
-      let keys = Array.from(states.keys());
+    if (states != null && states.size() > 0) {
+      let keys = states.keys();
       if (sortKey) {
         keys = keys.filter((k) => k.localeCompare(sortKey) <= 0);
       }
@@ -61,7 +62,7 @@ export class ContractInteractionState implements InteractionState {
     return storage.kvMap(sortKey, options);
   }
 
-  async commit(interaction: GQLNodeInterface): Promise<void> {
+  async commit(interaction: GQLNodeInterface, forceStore = false): Promise<void> {
     if (interaction.dry) {
       await this.rollbackKVs();
       return this.reset();
@@ -74,7 +75,7 @@ export class ContractInteractionState implements InteractionState {
           latestState.set(k, state.cachedValue);
         }
       });
-      await this.doStoreJson(latestState, interaction);
+      await this.doStoreJson(latestState, interaction, forceStore);
       await this.commitKVs();
     } finally {
       this.reset();
@@ -103,7 +104,8 @@ export class ContractInteractionState implements InteractionState {
 
   update(contractTxId: string, state: EvalStateResult<unknown>, sortKey: string): void {
     if (!this._json.has(contractTxId)) {
-      this._json.set(contractTxId, new Map<string, EvalStateResult<unknown>>());
+      const cache = new SimpleLRUCache<string, EvalStateResult<unknown>>(10);
+      this._json.set(contractTxId, cache);
     }
     this._json.get(contractTxId).set(sortKey, state);
   }
@@ -128,8 +130,12 @@ export class ContractInteractionState implements InteractionState {
     this._kv.clear();
   }
 
-  private async doStoreJson(states: Map<string, EvalStateResult<unknown>>, interaction: GQLNodeInterface) {
-    if (states.size > 1) {
+  private async doStoreJson(
+    states: Map<string, EvalStateResult<unknown>>,
+    interaction: GQLNodeInterface,
+    forceStore = false
+  ) {
+    if (states.size > 1 || forceStore) {
       for (const [k, v] of states) {
         await this._warp.stateEvaluator.putInCache(k, interaction, v);
       }

src/contract/states/InteractionState.ts

@@ -28,7 +28,7 @@ export interface InteractionState {
    * Called by the {@link DefaultStateEvaluator} at the end every root's contract interaction evaluation
    * - IFF the result.type == 'ok'.
    */
-  commit(interaction: GQLNodeInterface): Promise<void>;
+  commit(interaction: GQLNodeInterface, forceStore?: boolean): Promise<void>;
 
   commitKV(): Promise<void>;
 

src/core/modules/impl/DefaultStateEvaluator.ts

@@ -313,11 +313,16 @@ export abstract class DefaultStateEvaluator implements StateEvaluator {
 
       // if that's the end of the root contract's interaction - commit all the uncommitted states to cache.
       if (contract.isRoot()) {
+        contract.clearChildren();
         // update the uncommitted state of the root contract
         if (lastConfirmedTxState) {
           contract.interactionState().update(contract.txId(), lastConfirmedTxState.state, lastConfirmedTxState.tx.sortKey);
           if (validity[missingInteraction.id]) {
-            await contract.interactionState().commit(missingInteraction);
+            let forceStateStoreToCache = false;
+            if (executionContext.evaluationOptions.cacheEveryNInteractions > 0) {
+              forceStateStoreToCache = i % executionContext.evaluationOptions.cacheEveryNInteractions === 0;
+            }
+            await contract.interactionState().commit(missingInteraction, forceStateStoreToCache);
           } else {
             await contract.interactionState().rollback(missingInteraction);
           }