Create IBC light clients in ICS scenario

Author: majecty

ibc.ts/src/common/chain.ts

@@ -72,7 +72,7 @@ export class Chain {
     }
 
     public async queryClient(
-        blockNumber: number
+        blockNumber?: number
     ): Promise<IBCQueryResult<ClientState> | null> {
         return this.sdk.rpc.sendRpcRequest("ibc_query_client_state", [
             this.counterpartyIdentifiers.client,
@@ -85,6 +85,12 @@ export class Chain {
     ): Promise<IBCHeader | null> {
         return this.sdk.rpc.sendRpcRequest("ibc_compose_header", [blockNumber]);
     }
+
+    public async queryChainHeader(blockNumber: number): Promise<string | null> {
+        return this.sdk.rpc.sendRpcRequest("chain_getRawHeaderByNumber", [
+            blockNumber
+        ]);
+    }
 }
 
 async function waitForTx(sdk: SDK, txHash: H256) {

ibc.ts/src/scenario/index.ts

@@ -1,5 +1,87 @@
+import Debug from "debug";
+import { getConfig } from "../common/config";
+import { Chain } from "../common/chain";
+import { PlatformAddress } from "codechain-primitives/lib";
+import { CreateClientDatagram } from "../common/datagram/createClient";
+import { strict as assert } from "assert";
+
+require("dotenv").config();
+
+const debug = Debug("scenario:main");
+
 async function main() {
-    console.log("Not implemented");
+    const config = getConfig();
+    const chainA = new Chain({
+        server: config.chainA.rpcURL,
+        networkId: config.chainA.networkId,
+        faucetAddress: PlatformAddress.fromString(config.chainA.faucetAddress),
+        counterpartyIdentifiers: {
+            client: config.chainA.counterpartyClientId,
+            connection: config.chainA.counterpartyConnectionId,
+            channel: config.chainA.counterpartyChannelId
+        },
+        keystorePath: config.chainA.keystorePath
+    });
+    const chainB = new Chain({
+        server: config.chainB.rpcURL,
+        networkId: config.chainB.networkId,
+        faucetAddress: PlatformAddress.fromString(config.chainB.faucetAddress),
+        counterpartyIdentifiers: {
+            client: config.chainB.counterpartyClientId,
+            connection: config.chainB.counterpartyConnectionId,
+            channel: config.chainB.counterpartyChannelId
+        },
+        keystorePath: config.chainB.keystorePath
+    });
+
+    console.log("Create a light client in chain A");
+    await createLightClient({ chain: chainA, counterpartyChain: chainB });
+    console.log("Create a light client in chain B");
+    await createLightClient({ chain: chainB, counterpartyChain: chainA });
 }
 
 main().catch(console.error);
+
+async function createLightClient({
+    chain,
+    counterpartyChain
+}: {
+    chain: Chain;
+    counterpartyChain: Chain;
+}) {
+    debug("Create light client");
+    const counterpartyBlockNumber = await counterpartyChain.latestHeight();
+    const blockNumber = await chain.latestHeight();
+    debug(`height is ${counterpartyBlockNumber}`);
+    const counterpartyRawHeader = await counterpartyChain.queryChainHeader(
+        counterpartyBlockNumber
+    );
+    debug(`rawHeader is ${counterpartyRawHeader}`);
+
+    assert(counterpartyRawHeader, "header should not be empty");
+    assert.notStrictEqual(
+        counterpartyRawHeader!.substr(0, 2),
+        "0x",
+        "should not start with 0x"
+    );
+
+    debug(`Get queryClient`);
+    const clientStateBefore = await chain.queryClient(blockNumber);
+    assert.notEqual(clientStateBefore, null, "querying on the best block");
+    assert.equal(clientStateBefore!.data, null, "client is not initialized");
+
+    const createClient = new CreateClientDatagram({
+        id: chain.counterpartyIdentifiers.client,
+        kind: 0,
+        consensusState: Buffer.alloc(0),
+        data: Buffer.from(counterpartyRawHeader!, "hex")
+    });
+
+    debug(`Submit datagram`);
+    await chain.submitDatagram(createClient);
+
+    const clientStateAfter = await chain.queryClient();
+    assert.notEqual(clientStateAfter, null, "querying on the best block");
+    assert.notEqual(clientStateAfter!.data, null, "client is initialized");
+    debug(`Create client is ${JSON.stringify(clientStateAfter)}`);
+}