From 8b88ad835cf16786f8bd76157784fb09b63d1088 Mon Sep 17 00:00:00 2001
From: Leonid Logvinov <logvinov.leon@gmail.com>
Date: Thu, 6 Jul 2017 15:17:46 -0700
Subject: Cache networkId in web3Wrapper

---
 src/web3_wrapper.ts | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

(limited to 'src')

diff --git a/src/web3_wrapper.ts b/src/web3_wrapper.ts
index 630f0bef3..8c410eef7 100644
--- a/src/web3_wrapper.ts
+++ b/src/web3_wrapper.ts
@@ -5,11 +5,13 @@ import promisify = require('es6-promisify');
 
 export class Web3Wrapper {
     private web3: Web3;
+    private networkIdIfExists?: number;
     constructor(provider: Web3.Provider) {
         this.web3 = new Web3();
         this.web3.setProvider(provider);
     }
     public setProvider(provider: Web3.Provider) {
+        this.networkIdIfExists = undefined;
         this.web3.setProvider(provider);
     }
     public isAddress(address: string): boolean {
@@ -27,11 +29,16 @@ export class Web3Wrapper {
         return this.web3.currentProvider;
     }
     public async getNetworkIdIfExistsAsync(): Promise<number|undefined> {
-        try {
-            const networkId = await this.getNetworkAsync();
-            return Number(networkId);
-        } catch (err) {
-            return undefined;
+        if (_.isUndefined(this.networkIdIfExists)) {
+            try {
+                const networkId = await this.getNetworkAsync();
+                this.networkIdIfExists = Number(networkId);
+                return this.networkIdIfExists;
+            } catch (err) {
+                return undefined;
+            }
+        } else {
+            return this.networkIdIfExists;
         }
     }
     public toWei(ethAmount: BigNumber.BigNumber): BigNumber.BigNumber {
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