Support KeyValue encoding/decoding (storage) (#164)

* consensus.setStorage takes KeyValueStorage[]

* encode KeyValue & KeyValueStorage

packages/type-extrinsics/src/consensus.ts

@@ -27,7 +27,7 @@ const setCode: CreateItemOptions = {
 const setStorage: CreateItemOptions = {
   description: 'Set storage entries',
   params: [
-    param('entries', ['KeyValue'])
+    param('entries', ['KeyValueStorage'])
   ],
   type: []
 };

packages/type-params/src/encode/type/index.ts

@@ -12,6 +12,7 @@ import u8aToU8a from '@polkadot/util/u8a/toU8a';
 import addressDecode from '@polkadot/util-keyring/address/decode';
 
 import sizes from '../../sizes';
+import keyValue from './keyValue';
 
 export default function encodeType (type: Param$Type, value: any, version: EncodingVersions): Uint8Array {
   try {
@@ -44,8 +45,6 @@ export default function encodeType (type: Param$Type, value: any, version: Encod
       case 'CandidateReceipt':
       case 'Digest':
       case 'Header':
-      case 'KeyValue':
-      case 'KeyValueStorage':
       case 'MisbehaviorReport':
       case 'Proposal':
         return u8aToU8a(value);
@@ -58,6 +57,10 @@ export default function encodeType (type: Param$Type, value: any, version: Encod
       case 'Index':
         return bnToU8a(value, sizes.Index.get(version), true);
 
+      case 'KeyValue':
+      case 'KeyValueStorage':
+        return keyValue(value);
+
       case 'ParachainId':
       case 'PropIndex':
       case 'ReferendumIndex':

packages/type-params/src/encode/type/keyValue.spec.js

@@ -0,0 +1,41 @@
+// Copyright 2017-2018 @polkadot/params authors & contributors
+// This software may be modified and distributed under the terms
+// of the ISC license. See the LICENSE file for details.
+
+import toU8a from '@polkadot/util/u8a/toU8a';
+
+import encode from './index';
+
+describe('keyValue', () => {
+  it('encodes KeyValueStorage -> Uint8Array properly', () => {
+    expect(
+      encode('KeyValueStorage', {
+        key: toU8a('0x11223344'),
+        value: toU8a('0x998877665544332211')
+      })
+    ).toEqual(
+      new Uint8Array([
+        4, 0, 0, 0,
+        0x11, 0x22, 0x33, 0x44,
+        9, 0, 0, 0,
+        0x99, 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11
+      ])
+    )
+  });
+
+  it('encodes KeyValue -> Uint8Array properly', () => {
+    expect(
+      encode('KeyValue', {
+        key: toU8a('0x11'),
+        value: toU8a('0x9988')
+      })
+    ).toEqual(
+      new Uint8Array([
+        1, 0, 0, 0,
+        0x11,
+        2, 0, 0, 0,
+        0x99, 0x88
+      ])
+    )
+  });
+});

packages/type-params/src/encode/type/keyValue.ts

@@ -0,0 +1,19 @@
+// Copyright 2017-2018 @polkadot/params authors & contributors
+// This software may be modified and distributed under the terms
+// of the ISC license. See the LICENSE file for details.
+
+import { KeyValue } from '../../types';
+
+import bnToU8a from '@polkadot/util/bn/toU8a';
+import u8aConcat from '@polkadot/util/u8a/concat';
+
+// NOTE reverse of ../../decode/value/keyValue
+
+export default function keyValue ({ key, value }: KeyValue): Uint8Array {
+  return u8aConcat(
+    bnToU8a(key.length, 32, true),
+    key,
+    bnToU8a(value.length, 32, true),
+    value
+  );
+}