hyperledger-cacti · petermetz · Oct 16, 2023 · Oct 9, 2023
@@ -147,6 +147,19 @@ args: {
 },
 ```
 
+## JSON-RPC Proxy
+- Connector can be used with web3js to send any JSON-RPC request to the ethereum node.
+
+### Example
+``` typescript
+  const proxyUrl = new URL(
+    "/api/v1/plugins/@hyperledger/cactus-plugin-ledger-connector-ethereum/json-rpc",
+    apiHost,
+  );
+  const web3ProxyClient = new Web3(proxyUrl.toString());
+  const gasPrice = await web3ProxyClient.eth.getGasPrice();
+```
+
 ## Running the tests
 
 To check that all has been installed correctly and that the pugin has no errors run jest test suites.

@@ -70,6 +70,7 @@
     "@hyperledger/cactus-core-api": "2.0.0-alpha.2",
     "axios": "0.21.4",
     "express": "4.17.3",
+    "http-proxy-middleware": "2.0.6",
     "minimist": "1.2.8",
     "prom-client": "13.2.0",
     "run-time-error": "1.4.0",

@@ -1159,6 +1159,9 @@
           }
         }
       }
+    },
+    "/api/v1/plugins/@hyperledger/cactus-plugin-ledger-connector-ethereum/json-rpc": {
+      "summary": "Proxy endpoint to pass JSON-RPC requests to remote ethereum node."
     }
   }
 }
@@ -78,6 +78,8 @@ import {
 } from "./types/model-type-guards";
 import { PrometheusExporter } from "./prometheus-exporter/prometheus-exporter";
 import { RuntimeError } from "run-time-error";
+import { createProxyMiddleware, fixRequestBody } from "http-proxy-middleware";
+
 import {
   Web3StringReturnFormat,
   convertWeb3ReceiptStatusToBool,
@@ -339,6 +341,26 @@ export class PluginLedgerConnectorEthereum
       });
     }
 
+    // Register JSON-RPC proxy to pass requests directly to ethereum node
+    if (this.options.rpcApiHttpHost) {
+      const proxyUrl =
+        "/api/v1/plugins/@hyperledger/cactus-plugin-ledger-connector-ethereum/json-rpc";
+      const targetUrl = this.options.rpcApiHttpHost;
+      app.use(
+        proxyUrl,
+        createProxyMiddleware({
+          target: targetUrl,
+          changeOrigin: true,
+          pathRewrite: {
+            [".*"]: "",
+          },
+          onProxyReq: fixRequestBody,
+          logLevel: "error",
+        }),
+      );
+      this.log.info(`Registered proxy from ${proxyUrl} to ${targetUrl}`);
+    }
+
     return webServices;
   }
 

@@ -63,7 +63,7 @@ describe("Ethereum contract deploy and invoke using keychain tests", () => {
     address: string,
     port: number,
     contractAddress: string,
-    apiHost,
+    apiHost: string,
     apiConfig,
     ledger: GethTestLedger,
     apiClient: EthereumApi,
@@ -129,6 +129,9 @@ describe("Ethereum contract deploy and invoke using keychain tests", () => {
       logLevel: testLogLevel,
       pluginRegistry: new PluginRegistry({ plugins: [keychainPlugin] }),
     });
+
+    await connector.getOrCreateWebServices();
+    await connector.registerWebServices(expressApp, wsApi);
   });
 
   afterAll(async () => {
@@ -143,9 +146,6 @@ describe("Ethereum contract deploy and invoke using keychain tests", () => {
   test("setup ethereum connector", async () => {
     // Instantiate connector with the keychain plugin that already has the
     // private key we want to use for one of our tests
-    await connector.getOrCreateWebServices();
-    await connector.registerWebServices(expressApp, wsApi);
-
     const initTransferValue = web3.utils.toWei(5000, "ether");
     await apiClient.runTransactionV1({
       web3SigningCredential: {
@@ -360,6 +360,7 @@ describe("Ethereum contract deploy and invoke using keychain tests", () => {
         maxPriorityFeePerGas: 0,
         maxFeePerGas: 0x40000000,
         gasLimit: 21000,
+        type: 2,
       },
       testEthAccount.privateKey,
     );

@@ -11,16 +11,29 @@ const testLogLevel = "info";
 const sutLogLevel = "info";
 
 import "jest-extended";
+import express from "express";
+import bodyParser from "body-parser";
+import http from "http";
+import Web3 from "web3";
 import { v4 as uuidv4 } from "uuid";
+import { Server as SocketIoServer } from "socket.io";
+import { AddressInfo } from "net";
+
 import { PluginRegistry } from "@hyperledger/cactus-core";
-import { PluginLedgerConnectorEthereum } from "../../../main/typescript/index";
+import { Constants } from "@hyperledger/cactus-core-api";
+import {
+  IListenOptions,
+  Logger,
+  LoggerProvider,
+  Servers,
+} from "@hyperledger/cactus-common";
 import { pruneDockerAllIfGithubAction } from "@hyperledger/cactus-test-tooling";
-import { Logger, LoggerProvider } from "@hyperledger/cactus-common";
 import {
   GethTestLedger,
   WHALE_ACCOUNT_ADDRESS,
 } from "@hyperledger/cactus-test-geth-ledger";
-import Web3 from "web3";
+
+import { PluginLedgerConnectorEthereum } from "../../../main/typescript/index";
 
 // Unit Test logger setup
 const log: Logger = LoggerProvider.getOrCreate({
@@ -36,6 +49,13 @@ describe("invokeRawWeb3EthMethod Tests", () => {
   let ethereumTestLedger: GethTestLedger;
   let connector: PluginLedgerConnectorEthereum;
   let web3: Web3;
+  let apiHost: string;
+  const expressApp = express();
+  expressApp.use(bodyParser.json({ limit: "250mb" }));
+  const server = http.createServer(expressApp);
+  const wsApi = new SocketIoServer(server, {
+    path: Constants.SocketIoConnectionPathV1,
+  });
 
   //////////////////////////////////
   // Environment Setup
@@ -64,21 +84,51 @@ describe("invokeRawWeb3EthMethod Tests", () => {
       pluginRegistry: new PluginRegistry(),
     });
 
+    const listenOptions: IListenOptions = {
+      hostname: "0.0.0.0",
+      port: 0,
+      server,
+    };
+    const addressInfo = (await Servers.listen(listenOptions)) as AddressInfo;
+    const { address, port } = addressInfo;
+    apiHost = `http://${address}:${port}`;
+
+    await connector.getOrCreateWebServices();
+    await connector.registerWebServices(expressApp, wsApi);
+
     web3 = new Web3(rpcApiHttpHost);
   });
 
   afterAll(async () => {
-    log.info("Shutdown connector");
-    await connector.shutdown();
+    log.info("Shutdown server");
+    await Servers.shutdown(server);
 
-    log.info("Stop and destroy the test ledger...");
-    await ethereumTestLedger.stop();
-    await ethereumTestLedger.destroy();
+    if (connector) {
+      log.info("Shutdown connector");
+      await connector.shutdown();
+    }
+
+    if (ethereumTestLedger) {
+      log.info("Stop and destroy the test ledger...");
+      await ethereumTestLedger.stop();
+      await ethereumTestLedger.destroy();
+    }
 
     log.info("Prune docker...");
     await pruneDockerAllIfGithubAction({ logLevel: testLogLevel });
   });
 
+  test("invoke method using json-rpc proxy", async () => {
+    const proxyUrl = new URL(
+      "/api/v1/plugins/@hyperledger/cactus-plugin-ledger-connector-ethereum/json-rpc",
+      apiHost,
+    );
+    const web3ProxyClient = new Web3(proxyUrl.toString());
+    const gasPrice = await web3ProxyClient.eth.getGasPrice();
+    expect(gasPrice).toBeTruthy();
+    expect(Number(gasPrice)).toBeGreaterThan(0);
+  });
+
   test("invokeRawWeb3EthMethod with 0-argument method works (getGasPrice)", async () => {
     const connectorResponse = await connector.invokeRawWeb3EthMethod({
       methodName: "getGasPrice",

@@ -6488,6 +6488,7 @@ __metadata:
     axios: 0.21.4
     chalk: 4.1.2
     express: 4.17.3
+    http-proxy-middleware: 2.0.6
     js-yaml: 4.1.0
     minimist: 1.2.8
     prom-client: 13.2.0
@@ -24695,7 +24696,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"http-proxy-middleware@npm:^2.0.3":
+"http-proxy-middleware@npm:2.0.6, http-proxy-middleware@npm:^2.0.3":
   version: 2.0.6
   resolution: "http-proxy-middleware@npm:2.0.6"
   dependencies:
-Original file line number
+Diff line change
@@ Expand Up / @@ -1159,6 +1159,9 @@ @@
               }
             }
           }
+        },
+        "/api/v1/plugins/@hyperledger/cactus-plugin-ledger-connector-ethereum/json-rpc": {
+          "summary": "Proxy endpoint to pass JSON-RPC requests to remote ethereum node."
         }
       }
     }