Specify fallback web3 provider in analytics

packages/instant/src/constants.ts

@@ -50,4 +50,5 @@ export const PROVIDER_TYPE_TO_NAME: { [key in ProviderType]: string } = {
     [ProviderType.Mist]: 'Mist',
     [ProviderType.CoinbaseWallet]: 'Coinbase Wallet',
     [ProviderType.Parity]: 'Parity',
+    [ProviderType.Fallback]: 'Fallback',
 };

packages/instant/src/types.ts

@@ -164,4 +164,5 @@ export enum ProviderType {
     Mist = 'MIST',
     CoinbaseWallet = 'COINBASE_WALLET',
     Cipher = 'CIPHER',
+    Fallback = 'FALLBACK',
 }

packages/instant/src/util/env.ts

@@ -52,6 +52,8 @@ export const envUtil = {
             return ProviderType.CoinbaseWallet;
         } else if (!_.isUndefined(_.get(window, '__CIPHER__'))) {
             return ProviderType.Cipher;
+        } else if ((provider as any).zeroExInstantFallbackEngine) {
+            return ProviderType.Fallback;
         }
         return;
     },

packages/instant/src/util/provider_factory.ts

@@ -29,6 +29,10 @@ export const providerFactory = {
         providerEngine.addProvider(new RPCSubprovider(rpcUrl));
         // // Start the Provider Engine
         providerEngine.start();
+        // This feels a bit dirty, but was the only way I could think of
+        // checking to see if this engine is our fallback engine, and not
+        // another Web3Provider engine provided by some dapp browser
+        (providerEngine as any).zeroExInstantFallbackEngine = true;
         return providerEngine;
     },
 };