Fixed out-of-bounds difficulty in getBlock, which can affect PoA netw…

…orks (#711).

packages/providers/src.ts/formatter.ts

@@ -36,17 +36,17 @@ export class Formatter {
     }
 
     getDefaultFormats(): Formats {
-        let formats: Formats = <Formats>({ });
+        const formats: Formats = <Formats>({ });
 
-        let address = this.address.bind(this);
-        let bigNumber = this.bigNumber.bind(this);
-        let blockTag = this.blockTag.bind(this);
-        let data = this.data.bind(this);
-        let hash = this.hash.bind(this);
-        let hex = this.hex.bind(this);
-        let number = this.number.bind(this);
+        const address = this.address.bind(this);
+        const bigNumber = this.bigNumber.bind(this);
+        const blockTag = this.blockTag.bind(this);
+        const data = this.data.bind(this);
+        const hash = this.hash.bind(this);
+        const hex = this.hex.bind(this);
+        const number = this.number.bind(this);
 
-        let strictData = (v: any) => { return this.data(v, true); };
+        const strictData = (v: any) => { return this.data(v, true); };
 
         formats.transaction = {
             hash: hash,
@@ -195,7 +195,7 @@ export class Formatter {
     }
 
     data(value: any, strict?: boolean): string {
-        let result = this.hex(value, strict);
+        const result = this.hex(value, strict);
         if ((result.length % 2) !== 0) {
             throw new Error("invalid data; odd-length - " + value);
         }
@@ -210,7 +210,7 @@ export class Formatter {
 
     callAddress(value: any): string {
         if (!isHexString(value, 32)) { return null; }
-        let address = getAddress(hexDataSlice(value, 12));
+        const address = getAddress(hexDataSlice(value, 12));
         return (address === AddressZero) ? null: address;
     }
 
@@ -237,7 +237,7 @@ export class Formatter {
 
     // Requires a hash, optionally requires 0x prefix; returns prefixed lowercase hash.
     hash(value: any, strict?: boolean): string {
-        let result = this.hex(value, strict);
+        const result = this.hex(value, strict);
         if (hexDataLength(result) !== 32) {
             return logger.throwArgumentError("invalid hash", "value", value);
         }
@@ -246,7 +246,9 @@ export class Formatter {
 
     // Returns the difficulty as a number, or if too large (i.e. PoA network) null
     difficulty(value: any): number {
-        let v = BigNumber.from(value);
+        if (value == null) { return null; }
+
+        const v = BigNumber.from(value);
 
         try {
             return v.toNumber();
@@ -328,7 +330,7 @@ export class Formatter {
         }
         */
 
-        let result: TransactionResponse = Formatter.check(this.formats.transaction, transaction);
+        const result: TransactionResponse = Formatter.check(this.formats.transaction, transaction);
 
         if (transaction.chainId != null) {
             let chainId = transaction.chainId;
@@ -382,7 +384,7 @@ export class Formatter {
         //let status = transactionReceipt.status;
         //let root = transactionReceipt.root;
 
-        let result: TransactionReceipt = Formatter.check(this.formats.receipt, value);
+        const result: TransactionReceipt = Formatter.check(this.formats.receipt, value);
         result.logs.forEach((entry, index) => {
             if (entry.transactionLogIndex == null) {
                 entry.transactionLogIndex = index;
@@ -414,10 +416,10 @@ export class Formatter {
     }
 
     static check(format: { [ name: string ]: FormatFunc }, object: any): any {
-        let result: any = {};
-        for (let key in format) {
+        const result: any = {};
+        for (const key in format) {
             try {
-                let value = format[key](object[key]);
+                const value = format[key](object[key]);
                 if (value !== undefined) { result[key] = value; }
             } catch (error) {
                 error.checkKey = key;
@@ -449,7 +451,7 @@ export class Formatter {
         return (function(array: any): Array<any> {
             if (!Array.isArray(array)) { throw new Error("not an array"); }
 
-            let result: any = [];
+            const result: any = [];
 
             array.forEach(function(value) {
                 result.push(format(value));

packages/tests/src.ts/test-providers.ts

@@ -120,7 +120,7 @@ const blockchainData: any = {
             balance: bnify("997787946734641021")
         },
         block3: {
-             hash: "0xf0ec9bf41b99a6bd1f6cd29f91302f71a1a82d14634d2e207edea4b7962f3676",
+            hash: "0xf0ec9bf41b99a6bd1f6cd29f91302f71a1a82d14634d2e207edea4b7962f3676",
             parentHash: "0xf110ecd84454f116e2222378e7bca81ac3e59be0dac96d7ec56d5ef1c3bc1d64",
             number: 3,
             timestamp: 1488459452,
@@ -131,6 +131,25 @@ const blockchainData: any = {
             extraData: "0xd5830105048650617269747986312e31352e31826c69",
             transactions: []
         },
+        // See: #711
+        block16265864: {
+            hash: "0xd92891a6eeaed4892289edf9bd5ebff261da5c6a51f7131cc1a481c6f4d1aa75",
+            parentHash: "0xcc769a02513be1df80eee7d3a5cb87f14f37baee03c13f3e3ad1e7bdcaf7dac3",
+            number: 16265864,
+            timestamp: 1579621004,
+            difficulty: null,
+            gasLimit: bnify("0x989680"),
+            gasUsed: bnify("0x0705bf"),
+            miner: "0x596e8221A30bFe6e7eFF67Fee664A01C73BA3C56",
+            extraData: "0xde830206088f5061726974792d457468657265756d86312e34302e30826c69",
+            transactions: [
+                "0x20e6760fa1297fb06c8c20e6ed99581e0ba964d51167ea3c8ff580bfcb10bfc3",
+                "0x0ce7eba48b1bbdee05823b79ae24e741f3f290d0abfef8ae9adf32db108b7dd6",
+                "0x1fa2baafa844bf4853e4abbbf49532bf570210d589dc626dbf7ebc4832bdfa5d",
+                "0xdb5d1fa54d30a4b6aee0b242a2c68ea52d3dd28703f69e6e30871827850aa2fa",
+                "0xcc898db85d7d2493d4778faf640be32a4a3b7f5f987257bdc0009ce75a18eeaa"
+            ]
+        },
     },
     rinkeby: {
         balance: {
@@ -327,6 +346,22 @@ function testProvider(providerName: string, networkName: string) {
             });
         });
 
+        // Kovan Test Case: See #711
+        if (blockchainData[networkName].block16265864) {
+            it("fetches block #16265864", function() {
+                this.timeout(20000);
+                let test = blockchainData[networkName].block16265864;
+                return provider.getBlock(16265864).then((block) => {
+                    for (let key in test) {
+                        equals("Block " + key, (<any>block)[key], test[key]);
+                    }
+                }, (error) => {
+                    console.log("Error", error);
+                    assert.ok(false);
+                });
+            });
+        }
+
         it("fetches address balance", function() {
             // @TODO: These tests could be fiddled with if someone sends ether to our address
             //  We should set up a contract on each network like: