feat: introduce InteractionType for explicit marking of contract interactions as 'write' or 'view'

This allows for some optimizations in WASM code: 'view' interactions do not require cloning of contract state

gh-309

src/contract/HandlerBasedContract.ts

@@ -6,7 +6,8 @@ import {
   ContractInteraction,
   HandlerApi,
   InteractionData,
-  InteractionResult
+  InteractionResult,
+  InteractionType
 } from '../core/modules/impl/HandlerExecutorFactory';
 import { LexicographicalInteractionsSorter } from '../core/modules/impl/LexicographicalInteractionsSorter';
 import { InteractionsSorter } from '../core/modules/InteractionsSorter';
@@ -212,7 +213,7 @@ export class HandlerBasedContract<State> implements Contract<State> {
     transfer: ArTransfer = emptyTransfer
   ): Promise<InteractionResult<State, View>> {
     this.logger.info('View state for', this._contractTxId);
-    return await this.callContract<Input, View>(input, undefined, undefined, tags, transfer);
+    return await this.callContract<Input, View>(input, 'view', undefined, undefined, tags, transfer);
   }
 
   async viewStateForTx<Input, View>(
@@ -220,7 +221,7 @@ export class HandlerBasedContract<State> implements Contract<State> {
     interactionTx: GQLNodeInterface
   ): Promise<InteractionResult<State, View>> {
     this.logger.info(`View state for ${this._contractTxId}`);
-    return await this.doApplyInputOnTx<Input, View>(input, interactionTx);
+    return await this.doApplyInputOnTx<Input, View>(input, interactionTx, 'view');
   }
 
   async dryWrite<Input>(
@@ -230,12 +231,12 @@ export class HandlerBasedContract<State> implements Contract<State> {
     transfer?: ArTransfer
   ): Promise<InteractionResult<State, unknown>> {
     this.logger.info('Dry-write for', this._contractTxId);
-    return await this.callContract<Input>(input, caller, undefined, tags, transfer);
+    return await this.callContract<Input>(input, 'write', caller, undefined, tags, transfer);
   }
 
   async applyInput<Input>(input: Input, transaction: GQLNodeInterface): Promise<InteractionResult<State, unknown>> {
     this.logger.info(`Apply-input from transaction ${transaction.id} for ${this._contractTxId}`);
-    return await this.doApplyInputOnTx<Input>(input, transaction);
+    return await this.doApplyInputOnTx<Input>(input, transaction, 'write');
   }
 
   async writeInteraction<Input>(
@@ -370,7 +371,7 @@ export class HandlerBasedContract<State> implements Contract<State> {
     reward?: string
   ) {
     if (this._evaluationOptions.internalWrites) {
-      // it modifies tags
+     // it modifies tags
       await this.discoverInternalWrites<Input>(input, tags, transfer, strict, vrf);
     }
 
@@ -400,7 +401,7 @@ export class HandlerBasedContract<State> implements Contract<State> {
         this.signature.type == 'arweave'
           ? await arweave.wallets.ownerToAddress(interactionTx.owner)
           : interactionTx.owner;
-      const handlerResult = await this.callContract(input, caller, undefined, tags, transfer, strict, vrf);
+      const handlerResult = await this.callContract(input, 'write', caller, undefined, tags, transfer, strict, vrf);
       if (handlerResult.type !== 'ok') {
         throw Error(`Cannot create interaction: ${handlerResult.errorMessage}`);
       }
@@ -630,6 +631,7 @@ export class HandlerBasedContract<State> implements Contract<State> {
 
   private async callContract<Input, View = unknown>(
     input: Input,
+    interactionType: InteractionType,
     caller?: string,
     sortKey?: string,
     tags: Tags = [],
@@ -673,7 +675,8 @@ export class HandlerBasedContract<State> implements Contract<State> {
     // create interaction transaction
     const interaction: ContractInteraction<Input> = {
       input,
-      caller: executionContext.caller
+      caller: executionContext.caller,
+      interactionType
     };
 
     this.logger.debug('interaction', interaction);
@@ -723,7 +726,8 @@ export class HandlerBasedContract<State> implements Contract<State> {
 
   private async doApplyInputOnTx<Input, View = unknown>(
     input: Input,
-    interactionTx: GQLNodeInterface
+    interactionTx: GQLNodeInterface,
+    interactionType: InteractionType
   ): Promise<InteractionResult<State, View>> {
     this.maybeResetRootContract();
 
@@ -748,7 +752,8 @@ export class HandlerBasedContract<State> implements Contract<State> {
 
     const interaction: ContractInteraction<Input> = {
       input,
-      caller: this._parentContract.txId()
+      caller: this._parentContract.txId(),
+      interactionType
     };
 
     const interactionData: InteractionData<Input> = {
@@ -990,7 +995,17 @@ export class HandlerBasedContract<State> implements Contract<State> {
     strict: boolean,
     vrf: boolean
   ) {
-    const handlerResult = await this.callContract(input, undefined, undefined, tags, transfer, strict, vrf, false);
+    const handlerResult = await this.callContract(
+      input,
+      'write',
+      undefined,
+      undefined,
+      tags,
+      transfer,
+      strict,
+      vrf,
+      false
+    );
 
     if (strict && handlerResult.type !== 'ok') {
       throw Error(`Cannot create interaction: ${handlerResult.errorMessage}`);

src/core/modules/impl/DefaultStateEvaluator.ts

@@ -213,7 +213,8 @@ export abstract class DefaultStateEvaluator implements StateEvaluator {
 
         const interaction: ContractInteraction<unknown> = {
           input,
-          caller: missingInteraction.owner.address
+          caller: missingInteraction.owner.address,
+          interactionType: 'write'
         };
 
         const interactionData = {

src/core/modules/impl/HandlerExecutorFactory.ts

@@ -243,7 +243,7 @@ async function getWasmModule(wasmResponse: Response, binary: Buffer): Promise<We
 }
 
 export interface InteractionData<Input> {
-  interaction?: ContractInteraction<Input>;
+  interaction: ContractInteraction<Input>;
   interactionTx: GQLNodeInterface;
 }
 
@@ -281,9 +281,12 @@ export type InteractionResult<State, Result> = HandlerResult<State, Result> & {
   originalErrorMessages?: Record<string, string>;
 };
 
+export type InteractionType = 'view' | 'write';
+
 export type ContractInteraction<Input> = {
   input: Input;
   caller: string;
+  interactionType: InteractionType;
 };
 
 export type InteractionResultType = 'ok' | 'error' | 'exception';

src/core/modules/impl/handler/JsHandlerApi.ts

@@ -52,9 +52,10 @@ export class JsHandlerApi<State> extends AbstractContractHandler<State> {
     executionContext: ExecutionContext<State>
   ): Promise<State> {
     if (this.contractDefinition.manifest?.evaluationOptions?.useConstructor) {
-      const interaction = {
+      const interaction: ContractInteraction<Input> = {
         input: { function: INIT_FUNC_NAME, args: initialState } as Input,
-        caller: this.contractDefinition.owner
+        caller: this.contractDefinition.owner,
+        interactionType: 'write'
       };
 
       const interactionTx = {

src/core/modules/impl/handler/WasmHandlerApi.ts

@@ -3,7 +3,7 @@ import { ContractDefinition } from '../../../../core/ContractDefinition';
 import { ExecutionContext } from '../../../../core/ExecutionContext';
 import { EvalStateResult } from '../../../../core/modules/StateEvaluator';
 import { SmartWeaveGlobal } from '../../../../legacy/smartweave-global';
-import { InteractionData, InteractionResult } from '../HandlerExecutorFactory';
+import { ContractInteraction, InteractionData, InteractionResult } from '../HandlerExecutorFactory';
 import { AbstractContractHandler } from './AbstractContractHandler';
 
 export class WasmHandlerApi<State> extends AbstractContractHandler<State> {
@@ -89,17 +89,20 @@ export class WasmHandlerApi<State> extends AbstractContractHandler<State> {
     }
   }
 
-  private async doHandle(action: any): Promise<any> {
+  private async doHandle(action: ContractInteraction<unknown>): Promise<any> {
     switch (this.contractDefinition.srcWasmLang) {
       case 'rust': {
-        let handleResult = await this.wasmExports.handle(action.input);
-        if (!handleResult) {
-          return;
+
+        const handleResult = action.interactionType === 'write' ? await this.wasmExports.warpContractWrite(action.input) : await this.wasmExports.warpContractView(action.input);
+
+        if (Object.prototype.hasOwnProperty.call(handleResult, 'WriteResponse')) {
+          return handleResult.WriteResponse;
         }
-        if (Object.prototype.hasOwnProperty.call(handleResult, 'Ok')) {
-          return handleResult.Ok;
-        } else {
-          this.logger.debug('Error from rust', handleResult.Err);
+        if (Object.prototype.hasOwnProperty.call(handleResult, 'ViewResponse')) {
+          return handleResult.ViewResponse;
+        }
+        {
+          this.logger.error('Error from rust', handleResult);
           let errorKey;
           let errorArgs = '';
           if (typeof handleResult.Err === 'string' || handleResult.Err instanceof String) {

src/core/modules/impl/wasm/rust-wasm-imports.ts

@@ -585,11 +585,20 @@ export const rustWasmImports = (swGlobal, wbindgenImports, wasmInstance, dtorVal
    * @param {any} interaction
    * @returns {Promise<any>}
    */
-  module.handle = function (interaction) {
-    var ret = wasmInstance.exports.handle(addHeapObject(interaction));
+  module.warpContractWrite = function (interaction) {
+    var ret = wasmInstance.exports.warpContractWrite(addHeapObject(interaction));
     return takeObject(ret);
   };
 
+    /**
+   * @param {any} interaction
+   * @returns {Promise<any>}
+   */
+    module.warpContractView = function (interaction) {
+      var ret = wasmInstance.exports.warpContractView(addHeapObject(interaction));
+      return takeObject(ret);
+    };
+  
   let stack_pointer = 32;
 
   function addBorrowedObject(obj) {