Truffle <> relay compatibility

.github/workflows/truffle-compatibility.yml

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+name: Truffle Compatibility
+
+on:
+  pull_request:
+    branches: [ main, release/** ]
+  push:
+    branches: [ main, release/** ]
+    tags: [ v* ]
+
+jobs:
+  setup-local-hedera:
+    name: Truffle Compatibility
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Setup node
+        uses: actions/setup-node@v2
+        with:
+          node-version: 16
+
+      - name: Checkout repo
+        uses: actions/checkout@v2
+
+      - name: Install packages
+        run: npm ci
+
+      - name: Create .env file
+        run: |
+          cp ./tools/truffle-example/.env.example ./tools/truffle-example/.env
+          cp ./packages/server/tests/localAcceptance.env .env
+
+      - name: Lerna Bootstrap
+        run: npm run setup
+
+      - name: Install pnpm
+        run: npm install -g pnpm
+
+      - name: Build Typescript
+        run: npx lerna run build
+
+      - name: Run RPC Server
+        run: npm run integration:prerequisite &
+
+      - name: Install truffle dependencies
+        run: cd ./tools/truffle-example/ && npm ci
+
+      - name: Run the truffle tests
+        uses: nick-fields/retry@v2
+        with:
+          max_attempts: 10
+          timeout_minutes: 10
+          retry_wait_seconds: 45
+          command: cd ./tools/truffle-example/ && npx truffle test

tools/truffle-example/.env.example

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+# all available private keys and addresses can be found here https://github.com/hashgraph/hedera-local-node#commands
+OPERATOR_PRIVATE_KEY=0x105d050185ccb907fba04dd92d8de9e32c18305e097ab41dadda21489a211524
+RECEIVER_PRIVATE_KEY=0x2e1d968b041d84dd120a5860cee60cd83f9374ef527ca86996317ada3d0d03e7
+RELAY_URL='http://localhost'
+RELAY_PORT=7546

tools/truffle-example/.gitignore

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+node_modules
+.env
+coverage
+coverage.json
+typechain
+typechain-types
+
+#Truffle files
+build

tools/truffle-example/contracts/Greeter.sol

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+//SPDX-License-Identifier: Unlicense
+pragma solidity ^0.8.0;
+
+contract Greeter {
+  string private greeting;
+
+  constructor(string memory _greeting) {
+    greeting = _greeting;
+  }
+
+  function greet() public view returns (string memory) {
+    return greeting;
+  }
+
+  function setGreeting(string memory _greeting) public {
+    greeting = _greeting;
+  }
+}

tools/truffle-example/migrations/1_deploy_greeter.js

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+/*-
+ *
+ * Hedera JSON RPC Relay - Truffle Example
+ *
+ * Copyright (C) 2022 Hedera Hashgraph, LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+const Greeter = artifacts.require('Greeter');
+
+module.exports = function (deployer) {
+  deployer.deploy(Greeter, 'initial_msg');
+};