Merge pull request #12 from paritytech/mh-block-error

Temporary fix for block 461694

Author: maciejhirsz

package.json

@@ -1,6 +1,6 @@
 {
   "name": "polkadot-rpc-proxy",
-  "version": "0.1.3",
+  "version": "0.1.4",
   "description": "",
   "main": "index.js",
   "scripts": {
@@ -11,10 +11,10 @@
   "author": "",
   "license": "GPL-3.0-or-later",
   "dependencies": {
-    "@polkadot/api": "^1.1.1",
-    "@polkadot/metadata": "^1.1.1",
-    "@polkadot/rpc-provider": "^1.1.1",
-    "@polkadot/types": "^1.1.1",
+    "@polkadot/api": "^1.3.1",
+    "@polkadot/metadata": "^1.3.1",
+    "@polkadot/rpc-provider": "^1.3.1",
+    "@polkadot/types": "^1.3.1",
     "@types/express": "^4.17.2",
     "express": "^4.17.1",
     "typescript": "^3.7.4"

src/ApiHandler.ts

@@ -157,17 +157,22 @@ export default class ApiHandler {
 	async ensureMeta(hash: BlockHash) {
 		const { api } = this;
 
-		const runtimeVersion = await api.rpc.state.getRuntimeVersion(hash);
-		const blockSpecVersion = runtimeVersion.specVersion;
+		try {
+			const runtimeVersion = await api.rpc.state.getRuntimeVersion(hash);
+			const blockSpecVersion = runtimeVersion.specVersion;
 
-	    // swap metadata if spec version is different
-	    if (!this.specVersion.eq(blockSpecVersion)) {
-	    	this.specVersion = blockSpecVersion;
-			const meta = await api.rpc.state.getMetadata(hash);
-			const chain = await api.rpc.system.chain();
+		    // swap metadata if spec version is different
+		    if (!this.specVersion.eq(blockSpecVersion)) {
+		    	this.specVersion = blockSpecVersion;
+				const meta = await api.rpc.state.getMetadata(hash);
+				const chain = await api.rpc.system.chain();
 
-			api.registry.register(getChainTypes(chain, runtimeVersion));
-			api.registry.setMetadata(meta);
+				api.registry.register(getChainTypes(chain, runtimeVersion));
+				api.registry.setMetadata(meta);
+			}
+		} catch (err) {
+			console.error(`Failed to get Metadata for block ${hash}, using latest.`);
+			console.error(err);
 		}
 	}
 }