feat: readContract

.changeset/empty-poets-destroy.md

@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Added `readContract`

site/.vitepress/sidebar.ts

@@ -413,7 +413,7 @@ export const sidebar: DefaultTheme.Sidebar = {
               link: '/docs/contract/multicall',
             },
             {
-              text: 'readContract 🚧',
+              text: 'readContract',
               link: '/docs/contract/readContract',
             },
             {

src/actions/index.test.ts

@@ -37,6 +37,7 @@ test('exports actions', () => {
       "increaseTime": [Function],
       "inspectTxpool": [Function],
       "mine": [Function],
+      "readContract": [Function],
       "removeBlockTimestampInterval": [Function],
       "requestAccounts": [Function],
       "requestPermissions": [Function],

src/actions/index.ts

@@ -20,6 +20,7 @@ export {
   getTransactionConfirmations,
   getTransactionCount,
   getTransactionReceipt,
+  readContract,
   simulateContract,
   uninstallFilter,
   waitForTransactionReceipt,
@@ -69,6 +70,8 @@ export type {
   OnBlockResponse,
   OnTransactions,
   OnTransactionsResponse,
+  ReadContractArgs,
+  ReadContractResponse,
   ReplacementReason,
   ReplacementResponse,
   SimulateContractArgs,

src/actions/public/index.test.ts

@@ -26,6 +26,7 @@ test('exports actions', () => {
       "getTransactionConfirmations": [Function],
       "getTransactionCount": [Function],
       "getTransactionReceipt": [Function],
+      "readContract": [Function],
       "simulateContract": [Function],
       "uninstallFilter": [Function],
       "waitForTransactionReceipt": [Function],

src/actions/public/index.ts

@@ -5,7 +5,6 @@ export { simulateContract } from './simulateContract'
 export type {
   SimulateContractArgs,
   SimulateContractResponse,
-  FormattedSimulateContract,
 } from './simulateContract'
 
 export { createPendingTransactionFilter } from './createPendingTransactionFilter'
@@ -91,6 +90,12 @@ export type {
   GetTransactionReceiptResponse,
 } from './getTransactionReceipt'
 
+export { readContract } from './readContract'
+export type {
+  ReadContractArgs,
+  ReadContractResponse,
+} from './readContract'
+
 export { uninstallFilter } from './uninstallFilter'
 export type {
   UninstallFilterArgs,

src/actions/public/readContract.test.ts

@@ -0,0 +1,128 @@
+/**
+ * TODO:  Heaps more test cases :D
+ *        - Complex calldata types
+ *        - Complex return types (tuple/structs)
+ *        - Calls against blocks
+ */
+
+import { describe, expect, test } from 'vitest'
+import {
+  accounts,
+  publicClient,
+  testClient,
+  wagmiContractConfig,
+  walletClient,
+} from '../../_test'
+import { baycContractConfig } from '../../_test/abis'
+import { encodeFunctionData } from '../../utils'
+import { mine } from '../test'
+import { sendTransaction } from '../wallet'
+
+import { deployContract } from './deployContract'
+import { getTransactionReceipt } from './getTransactionReceipt'
+import { readContract } from './readContract'
+
+describe('wagmi', () => {
+  test('default', async () => {
+    expect(
+      await readContract(publicClient, {
+        ...wagmiContractConfig,
+        functionName: 'balanceOf',
+        args: ['0xa5cc3c03994DB5b0d9A5eEdD10CabaB0813678AC'],
+      }),
+    ).toEqual(3n)
+    expect(
+      await readContract(publicClient, {
+        ...wagmiContractConfig,
+        functionName: 'getApproved',
+        args: [420n],
+      }),
+    ).toEqual('0x0000000000000000000000000000000000000000')
+    expect(
+      await readContract(publicClient, {
+        ...wagmiContractConfig,
+        functionName: 'isApprovedForAll',
+        args: [
+          '0xa5cc3c03994DB5b0d9A5eEdD10CabaB0813678AC',
+          '0x0000000000000000000000000000000000000000',
+        ],
+      }),
+    ).toEqual(false)
+    expect(
+      await readContract(publicClient, {
+        ...wagmiContractConfig,
+        functionName: 'name',
+      }),
+    ).toEqual('wagmi')
+    expect(
+      await readContract(publicClient, {
+        ...wagmiContractConfig,
+        functionName: 'ownerOf',
+        args: [420n],
+      }),
+    ).toEqual('0xa5cc3c03994DB5b0d9A5eEdD10CabaB0813678AC')
+    expect(
+      await readContract(publicClient, {
+        ...wagmiContractConfig,
+        functionName: 'supportsInterface',
+        args: ['0x1a452251'],
+      }),
+    ).toEqual(false)
+    expect(
+      await readContract(publicClient, {
+        ...wagmiContractConfig,
+        functionName: 'symbol',
+      }),
+    ).toEqual('WAGMI')
+    expect(
+      await readContract(publicClient, {
+        ...wagmiContractConfig,
+        functionName: 'tokenURI',
+        args: [420n],
+      }),
+    ).toMatchInlineSnapshot(
+      '"data:application/json;base64,eyJuYW1lIjogIndhZ21pICM0MjAiLCAiaW1hZ2UiOiAiZGF0YTppbWFnZS9zdmcreG1sO2Jhc2U2NCxQSE4yWnlCNGJXeHVjejBpYUhSMGNEb3ZMM2QzZHk1M015NXZjbWN2TWpBd01DOXpkbWNpSUhkcFpIUm9QU0l4TURJMElpQm9aV2xuYUhROUlqRXdNalFpSUdacGJHdzlJbTV2Ym1VaVBqeHdZWFJvSUdacGJHdzlJbWh6YkNneE1UY3NJREV3TUNVc0lERXdKU2tpSUdROUlrMHdJREJvTVRBeU5IWXhNREkwU0RCNklpQXZQanhuSUdacGJHdzlJbWh6YkNneU9EZ3NJREV3TUNVc0lEa3dKU2tpUGp4d1lYUm9JR1E5SWswNU1ETWdORE0zTGpWak1DQTVMakV4TXkwM0xqTTRPQ0F4Tmk0MUxURTJMalVnTVRZdU5YTXRNVFl1TlMwM0xqTTROeTB4Tmk0MUxURTJMalVnTnk0ek9EZ3RNVFl1TlNBeE5pNDFMVEUyTGpVZ01UWXVOU0EzTGpNNE55QXhOaTQxSURFMkxqVjZUVFk1T0M0MU1qa2dOVFkyWXpZdU9USXhJREFnTVRJdU5UTXROUzQxT1RZZ01USXVOVE10TVRJdU5YWXROVEJqTUMwMkxqa3dOQ0ExTGpZd09TMHhNaTQxSURFeUxqVXlPUzB4TWk0MWFESTFMakExT1dNMkxqa3lJREFnTVRJdU5USTVJRFV1TlRrMklERXlMalV5T1NBeE1pNDFkalV3WXpBZ05pNDVNRFFnTlM0Mk1Ea2dNVEl1TlNBeE1pNDFNeUF4TWk0MWN6RXlMalV5T1MwMUxqVTVOaUF4TWk0MU1qa3RNVEl1TlhZdE5UQmpNQzAyTGprd05DQTFMall3T1MweE1pNDFJREV5TGpVekxURXlMalZvTWpVdU1EVTVZell1T1RJZ01DQXhNaTQxTWprZ05TNDFPVFlnTVRJdU5USTVJREV5TGpWMk5UQmpNQ0EyTGprd05DQTFMall3T1NBeE1pNDFJREV5TGpVeU9TQXhNaTQxYURNM0xqVTRPV00yTGpreUlEQWdNVEl1TlRJNUxUVXVOVGsySURFeUxqVXlPUzB4TWk0MWRpMDNOV013TFRZdU9UQTBMVFV1TmpBNUxURXlMalV0TVRJdU5USTVMVEV5TGpWekxURXlMalV6SURVdU5UazJMVEV5TGpVeklERXlMalYyTlRZdU1qVmhOaTR5TmpRZ05pNHlOalFnTUNBeElERXRNVEl1TlRJNUlEQldORGM0TGpWak1DMDJMamt3TkMwMUxqWXdPUzB4TWk0MUxURXlMalV6TFRFeUxqVklOams0TGpVeU9XTXROaTQ1TWlBd0xURXlMalV5T1NBMUxqVTVOaTB4TWk0MU1qa2dNVEl1TlhZM05XTXdJRFl1T1RBMElEVXVOakE1SURFeUxqVWdNVEl1TlRJNUlERXlMalY2SWlBdlBqeHdZWFJvSUdROUlrMHhOVGN1TmpVMUlEVTBNV010Tmk0NU16SWdNQzB4TWk0MU5USXROUzQxT1RZdE1USXVOVFV5TFRFeUxqVjJMVFV3WXpBdE5pNDVNRFF0TlM0Mk1Ua3RNVEl1TlMweE1pNDFOVEV0TVRJdU5WTXhNakFnTkRjeExqVTVOaUF4TWpBZ05EYzRMalYyTnpWak1DQTJMamt3TkNBMUxqWXlJREV5TGpVZ01USXVOVFV5SURFeUxqVm9NVFV3TGpZeVl6WXVPVE16SURBZ01USXVOVFV5TFRVdU5UazJJREV5TGpVMU1pMHhNaTQxZGkwMU1HTXdMVFl1T1RBMElEVXVOakU1TFRFeUxqVWdNVEl1TlRVeUxURXlMalZvTVRRMExqTTBOV016TGpRMk5TQXdJRFl1TWpjMklESXVOems0SURZdU1qYzJJRFl1TWpWekxUSXVPREV4SURZdU1qVXROaTR5TnpZZ05pNHlOVWd6TWpBdU9ESTRZeTAyTGprek15QXdMVEV5TGpVMU1pQTFMalU1TmkweE1pNDFOVElnTVRJdU5YWXpOeTQxWXpBZ05pNDVNRFFnTlM0Mk1Ua2dNVEl1TlNBeE1pNDFOVElnTVRJdU5XZ3hOVEF1TmpKak5pNDVNek1nTUNBeE1pNDFOVEl0TlM0MU9UWWdNVEl1TlRVeUxURXlMalYyTFRjMVl6QXROaTQ1TURRdE5TNDJNVGt0TVRJdU5TMHhNaTQxTlRJdE1USXVOVWd5T0RNdU1UY3lZeTAyTGprek1pQXdMVEV5TGpVMU1TQTFMalU1TmkweE1pNDFOVEVnTVRJdU5YWTFNR013SURZdU9UQTBMVFV1TmpFNUlERXlMalV0TVRJdU5UVXlJREV5TGpWb0xUSTFMakV3TTJNdE5pNDVNek1nTUMweE1pNDFOVEl0TlM0MU9UWXRNVEl1TlRVeUxURXlMalYyTFRVd1l6QXROaTQ1TURRdE5TNDJNaTB4TWk0MUxURXlMalUxTWkweE1pNDFjeTB4TWk0MU5USWdOUzQxT1RZdE1USXVOVFV5SURFeUxqVjJOVEJqTUNBMkxqa3dOQzAxTGpZeE9TQXhNaTQxTFRFeUxqVTFNU0F4TWk0MWFDMHlOUzR4TURSNmJUTXdNUzR5TkRJdE5pNHlOV013SURNdU5EVXlMVEl1T0RFeElEWXVNalV0Tmk0eU56WWdOaTR5TlVnek16a3VOalUxWXkwekxqUTJOU0F3TFRZdU1qYzJMVEl1TnprNExUWXVNamMyTFRZdU1qVnpNaTQ0TVRFdE5pNHlOU0EyTGpJM05pMDJMakkxYURFeE1pNDVOalpqTXk0ME5qVWdNQ0EyTGpJM05pQXlMamM1T0NBMkxqSTNOaUEyTGpJMWVrMDBPVGNnTlRVekxqZ3hPR013SURZdU9USTVJRFV1TmpJNElERXlMalUwTmlBeE1pNDFOekVnTVRJdU5UUTJhREV6TW1FMkxqSTRJRFl1TWpnZ01DQXdJREVnTmk0eU9EWWdOaTR5TnpJZ05pNHlPQ0EyTGpJNElEQWdNQ0F4TFRZdU1qZzJJRFl1TWpjemFDMHhNekpqTFRZdU9UUXpJREF0TVRJdU5UY3hJRFV1TmpFMkxURXlMalUzTVNBeE1pNDFORFpCTVRJdU5UWWdNVEl1TlRZZ01DQXdJREFnTlRBNUxqVTNNU0EyTURSb01UVXdMamcxT0dNMkxqazBNeUF3SURFeUxqVTNNUzAxTGpZeE5pQXhNaTQxTnpFdE1USXVOVFExZGkweE1USXVPVEZqTUMwMkxqa3lPQzAxTGpZeU9DMHhNaTQxTkRVdE1USXVOVGN4TFRFeUxqVTBOVWcxTURrdU5UY3hZeTAyTGprME15QXdMVEV5TGpVM01TQTFMall4TnkweE1pNDFOekVnTVRJdU5UUTFkamMxTGpJM00zcHRNemN1TnpFMExUWXlMamN5TjJNdE5pNDVORE1nTUMweE1pNDFOekVnTlM0Mk1UY3RNVEl1TlRjeElERXlMalUwTlhZeU5TNHdPVEZqTUNBMkxqa3lPU0ExTGpZeU9DQXhNaTQxTkRZZ01USXVOVGN4SURFeUxqVTBObWd4TURBdU5UY3lZell1T1RReklEQWdNVEl1TlRjeExUVXVOakUzSURFeUxqVTNNUzB4TWk0MU5EWjJMVEkxTGpBNU1XTXdMVFl1T1RJNExUVXVOakk0TFRFeUxqVTBOUzB4TWk0MU56RXRNVEl1TlRRMVNEVXpOQzQzTVRSNklpQm1hV3hzTFhKMWJHVTlJbVYyWlc1dlpHUWlJQzgrUEM5blBqd3ZjM1puUGc9PSJ9"',
+    )
+    expect(
+      await readContract(publicClient, {
+        ...wagmiContractConfig,
+        functionName: 'totalSupply',
+      }),
+    ).toEqual(558n)
+  })
+})
+
+test('fake contract address', async () => {
+  await expect(() =>
+    readContract(publicClient, {
+      abi: wagmiContractConfig.abi,
+      address: '0x0000000000000000000000000000000000000069',
+      functionName: 'totalSupply',
+    }),
+  ).rejects.toThrowErrorMatchingInlineSnapshot(`
+    "The contract method \\"totalSupply\\" returned no data (\\"0x\\"). This could be due to any of the following:
+    - The contract does not have the function \\"totalSupply\\",
+    - The parameters passed to the contract function may be invalid, or
+    - The address is not a contract.
+     
+    Contract: 0x0000000000000000000000000000000000000000
+    Function: totalSupply()
+            > \\"0x\\"
+
+    Version: viem@1.0.2"
+  `)
+})
+
+// Deploy BAYC Contract
+async function deployBAYC() {
+  const hash = await deployContract(walletClient, {
+    ...baycContractConfig,
+    args: ['Bored Ape Wagmi Club', 'BAYC', 69420n, 0n],
+    from: accounts[0].address,
+  })
+  await mine(testClient, { blocks: 1 })
+  const { contractAddress } = await getTransactionReceipt(publicClient, {
+    hash,
+  })
+  return { contractAddress }
+}

src/actions/public/readContract.ts

@@ -0,0 +1,87 @@
+import { Abi } from 'abitype'
+
+import type { Chain, Formatter } from '../../chains'
+import type { PublicClient } from '../../clients'
+import type {
+  Address,
+  ExtractArgsFromAbi,
+  ExtractResultFromAbi,
+  ExtractFunctionNameFromAbi,
+} from '../../types'
+import {
+  EncodeFunctionDataArgs,
+  decodeFunctionResult,
+  encodeFunctionData,
+  getContractError,
+} from '../../utils'
+import { call, CallArgs, FormattedCall } from './call'
+
+export type FormattedReadContract<
+  TFormatter extends Formatter | undefined = Formatter,
+> = FormattedCall<TFormatter>
+
+export type ReadContractArgs<
+  TAbi extends Abi | readonly unknown[] = Abi,
+  TFunctionName extends string = any,
+> = Omit<
+  CallArgs,
+  | 'accessList'
+  | 'chain'
+  | 'from'
+  | 'gas'
+  | 'gasPrice'
+  | 'maxFeePerGas'
+  | 'maxPriorityFeePerGas'
+  | 'nonce'
+  | 'to'
+  | 'data'
+  | 'value'
+> & {
+  address: Address
+  abi: TAbi
+  functionName: ExtractFunctionNameFromAbi<TAbi, TFunctionName, 'pure' | 'view'>
+} & ExtractArgsFromAbi<TAbi, TFunctionName>
+
+export type ReadContractResponse<
+  TAbi extends Abi | readonly unknown[] = Abi,
+  TFunctionName extends string = string,
+> = ExtractResultFromAbi<TAbi, TFunctionName>
+
+export async function readContract<
+  TAbi extends Abi = Abi,
+  TFunctionName extends string = any,
+>(
+  client: PublicClient,
+  {
+    abi,
+    address,
+    args,
+    functionName,
+    ...callRequest
+  }: ReadContractArgs<TAbi, TFunctionName>,
+): Promise<ReadContractResponse<TAbi, TFunctionName>> {
+  const calldata = encodeFunctionData({
+    abi,
+    args,
+    functionName,
+  } as unknown as EncodeFunctionDataArgs<TAbi, TFunctionName>)
+  try {
+    const { data } = await call(client, {
+      data: calldata,
+      to: address,
+      ...callRequest,
+    } as unknown as CallArgs)
+    return decodeFunctionResult({
+      abi,
+      functionName,
+      data: data || '0x',
+    })
+  } catch (err) {
+    throw getContractError(err, {
+      abi,
+      address,
+      args,
+      functionName,
+    })
+  }
+}

src/actions/public/simulateContract.ts

@@ -16,11 +16,7 @@ import {
   getContractError,
 } from '../../utils'
 import { WriteContractArgs } from '../wallet'
-import { call, CallArgs, FormattedCall } from './call'
-
-export type FormattedSimulateContract<
-  TFormatter extends Formatter | undefined = Formatter,
-> = FormattedCall<TFormatter>
+import { call, CallArgs } from './call'
 
 export type SimulateContractArgs<
   TChain extends Chain = Chain,

src/actions/wallet/writeContract.ts

@@ -10,16 +10,11 @@ import type {
 } from '../../types'
 import { EncodeFunctionDataArgs, encodeFunctionData } from '../../utils'
 import {
-  FormattedTransactionRequest,
   sendTransaction,
   SendTransactionArgs,
   SendTransactionResponse,
 } from './sendTransaction'
 
-export type FormattedWriteContract<
-  TFormatter extends Formatter | undefined = Formatter,
-> = FormattedTransactionRequest<TFormatter>
-
 export type WriteContractArgs<
   TChain extends Chain = Chain,
   TAbi extends Abi | readonly unknown[] = Abi,

src/index.test.ts

@@ -156,6 +156,7 @@ test('exports actions', () => {
       "parseEther": [Function],
       "parseGwei": [Function],
       "parseUnit": [Function],
+      "readContract": [Function],
       "removeBlockTimestampInterval": [Function],
       "requestAccounts": [Function],
       "requestPermissions": [Function],

src/index.ts

@@ -45,6 +45,8 @@ export type {
   OnBlockResponse,
   OnTransactions,
   OnTransactionsResponse,
+  ReadContractArgs,
+  ReadContractResponse,
   ResetArgs,
   RequestPermissionsResponse,
   RevertArgs,
@@ -113,6 +115,7 @@ export {
   increaseTime,
   inspectTxpool,
   mine,
+  readContract,
   removeBlockTimestampInterval,
   reset,
   requestAccounts,