script to test polkadot.js/api functions

tests/polkadotjs_test/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "apitest",
+  "version": "1.0.0",
+  "description": "test polkadot js api stuff",
+  "main": "test.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@polkadot/api": "^2.10.1"
+  }
+}

tests/polkadotjs_test/test.js

@@ -0,0 +1,76 @@
+// Import
+const { ApiPromise, WsProvider } = require('@polkadot/api');
+const {Keyring } = require('@polkadot/keyring');
+
+async function main() {
+    // Construct
+
+    const wsProvider = new WsProvider('ws://127.0.0.1:8546');
+    const api = await ApiPromise.create({ provider: wsProvider });
+
+    // chain defaults
+    const genesisHash = await api.genesisHash;
+    console.log(`genesis hash: ${genesisHash}`);
+
+    const runtimeMetadata = await  api.runtimeMetadata;
+    // currently not sending runtimeMetadata to console because it's very large, uncomment if you want to see
+    // console.log(`runtime metadata: ${runtimeMetadata}`);
+
+    const runtimeVersion = await api.runtimeVersion;
+    console.log(`runtime version: ${runtimeVersion}`);
+
+    const libraryInfo = await api.libraryInfo;
+    console.log(`library info: ${libraryInfo}`);
+
+    //Basic queries
+    const now = await api.query.timestamp.now();
+    console.log(`timestamp now: ${now}`);
+
+    // Retrieve the account balance & nonce via the system module
+    const ADDR_Alice = '5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY';
+    const { nonce, data: balance } = await api.query.system.account(ADDR_Alice);
+    console.log(`Alice: balance of ${balance.free} and a nonce of ${nonce}`)
+
+    // RPC queries
+    const chain = await api.rpc.system.chain();
+    console.log(`system chain: ${chain}`);
+
+    const sysProperties = await api.rpc.system.properties();
+    console.log(`system properties: ${sysProperties}`);
+
+    const chainType = await api.rpc.system.chainType();
+    console.log(`system chainType: ${chainType}`);
+
+    const header = await api.rpc.chain.getHeader();
+    console.log(`header ${header}`);
+
+    // Subscribe to the new headers
+    // TODO: Issue: chain.subscribeNewHeads is returning values twice for each result new head.
+    let count = 0;
+    const unsubHeads = await api.rpc.chain.subscribeNewHeads((lastHeader) => {
+        console.log(`${chain}: last block #${lastHeader.number} has hash ${lastHeader.hash}`);
+        if (++count === 5) {
+            unsubHeads();
+        }
+    });
+
+    const blockHash = await api.rpc.chain.getBlockHash();
+    console.log(`current blockhash ${blockHash}`);
+
+    const block = await api.rpc.chain.getBlock(blockHash);
+    console.log(`current block: ${block}`);
+
+    // Simple transaction
+    // TODO Issue:  This currently fails with error: RPC-CORE: submitExtrinsic(extrinsic: Extrinsic): Hash:: -32000: validator: (nil *modules.Extrinsic): null
+    const keyring = new Keyring({type: 'sr25519' });
+    const aliceKey = keyring.addFromUri('//Alice');
+    const ADDR_Bob = '5FHneW46xGXgs5mUiveU4sbTyGBzmstUspZC92UhjJM694ty';
+
+    const transfer = await api.tx.balances.transfer(ADDR_Bob, 12345)
+        .signAndSend(aliceKey);
+
+    console.log(`hxHash ${transfer}`);
+
+}
+
+main().catch(console.error);