From c93b48920e4861b4fe35c60be19344abbb19a184 Mon Sep 17 00:00:00 2001
From: Richard Moore <github@ricmoo.com>
Date: Thu, 18 Apr 2019 13:49:37 +0200
Subject: [PATCH] Increment JSON-RPC ID for JsonRpcProviders for environments
 that unsafely manage callbacks (#489).

---
 src.ts/providers/json-rpc-provider.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src.ts/providers/json-rpc-provider.ts b/src.ts/providers/json-rpc-provider.ts
index 65dc7485ff..5248b93931 100644
--- a/src.ts/providers/json-rpc-provider.ts
+++ b/src.ts/providers/json-rpc-provider.ts
@@ -50,6 +50,11 @@ function getLowerCase(value: string): string {
 
 const _constructorGuard = {};
 
+// Some environments (Trust Wallet and company) use a global map
+// to track JSON-RPC ID, so we try to keep IDs unique across all
+// connections. See #489.
+let _nextId = 42;
+
 export class JsonRpcSigner extends Signer {
     readonly provider: JsonRpcProvider;
     private _index: number;
@@ -250,7 +255,7 @@ export class JsonRpcProvider extends BaseProvider {
         let request = {
             method: method,
             params: params,
-            id: 42,
+            id: (_nextId++),
             jsonrpc: "2.0"
         };