From 120fb7799e050592631a227175eceee56c0febda Mon Sep 17 00:00:00 2001
From: Jaco Greeff <jacogr@gmail.com>
Date: Fri, 19 Mar 2021 16:06:31 +0100
Subject: [PATCH] Parachain voters (#4872)

* Parachain voters

* | null
---
 .../src/Overview/Parachain.tsx                | 51 ++++++++++++++++---
 .../src/Overview/Parachains.tsx               |  1 +
 2 files changed, 46 insertions(+), 6 deletions(-)

diff --git a/packages/page-parachains/src/Overview/Parachain.tsx b/packages/page-parachains/src/Overview/Parachain.tsx
index deff8c9d0c..66b1367a10 100644
--- a/packages/page-parachains/src/Overview/Parachain.tsx
+++ b/packages/page-parachains/src/Overview/Parachain.tsx
@@ -2,12 +2,12 @@
 // SPDX-License-Identifier: Apache-2.0
 
 import type { Option, Vec } from '@polkadot/types';
-import type { AccountId, BlockNumber, HeadData, Header, ParaId, ParaLifecycle } from '@polkadot/types/interfaces';
+import type { AccountId, BlockNumber, CandidatePendingAvailability, HeadData, Header, ParaId, ParaLifecycle } from '@polkadot/types/interfaces';
 import type { Codec } from '@polkadot/types/types';
 import type { QueuedAction } from './types';
 
 import BN from 'bn.js';
-import React, { useCallback, useMemo } from 'react';
+import React, { useCallback, useEffect, useMemo, useState } from 'react';
 
 import { AddressMini, Badge, Expander, ParaLink } from '@polkadot/react-components';
 import { useApi, useCall, useCallMulti, useParaApi } from '@polkadot/react-hooks';
@@ -26,14 +26,16 @@ interface Props {
   lastBacked?: [string, string, BN];
   lastInclusion?: [string, string, BN];
   nextAction?: QueuedAction;
+  sessionValidators?: AccountId[] | null;
   validators?: AccountId[];
 }
 
-type QueryResult = [Option<HeadData>, Option<BlockNumber>, Option<ParaLifecycle>, Vec<Codec>, Vec<Codec>, Vec<Codec>, Vec<Codec>, Option<BlockNumber>];
+type QueryResult = [Option<HeadData>, Option<BlockNumber>, Option<ParaLifecycle>, Vec<Codec>, Vec<Codec>, Vec<Codec>, Vec<Codec>, Option<BlockNumber>, Option<CandidatePendingAvailability>];
 
 interface QueryState {
   headHex: string | null;
   lifecycle: ParaLifecycle | null;
+  pendingAvail: CandidatePendingAvailability | null;
   updateAt: BlockNumber | null;
   qDmp: number;
   qUmp: number;
@@ -50,6 +52,7 @@ const optionsMulti = {
   defaultValue: {
     headHex: null,
     lifecycle: null,
+    pendingAvail: null,
     qDmp: 0,
     qHrmpE: 0,
     qHrmpI: 0,
@@ -57,11 +60,12 @@ const optionsMulti = {
     updateAt: null,
     watermark: null
   },
-  transform: ([headData, optUp, optLifecycle, dmp, ump, hrmpE, hrmpI, optWm]: QueryResult): QueryState => ({
+  transform: ([headData, optUp, optLifecycle, dmp, ump, hrmpE, hrmpI, optWm, optPending]: QueryResult): QueryState => ({
     headHex: headData.isSome
       ? sliceHex(headData.unwrap())
       : null,
     lifecycle: optLifecycle.unwrapOr(null),
+    pendingAvail: optPending.unwrapOr(null),
     qDmp: dmp.length,
     qHrmpE: hrmpE.length,
     qHrmpI: hrmpI.length,
@@ -71,7 +75,7 @@ const optionsMulti = {
   })
 };
 
-function Parachain ({ bestNumber, className = '', id, isScheduled, lastBacked, lastInclusion, nextAction, validators }: Props): React.ReactElement<Props> {
+function Parachain ({ bestNumber, className = '', id, isScheduled, lastBacked, lastInclusion, nextAction, sessionValidators, validators }: Props): React.ReactElement<Props> {
   const { t } = useTranslation();
   const { api } = useApi();
   const { api: paraApi } = useParaApi(id);
@@ -84,8 +88,10 @@ function Parachain ({ bestNumber, className = '', id, isScheduled, lastBacked, l
     [api.query.ump.relayDispatchQueues, id],
     [api.query.hrmp.hrmpEgressChannelsIndex, id],
     [api.query.hrmp.hrmpIngressChannelsIndex, id],
-    [api.query.hrmp.hrmpWatermarks, id]
+    [api.query.hrmp.hrmpWatermarks, id],
+    [api.query.inclusion.pendingAvailability, id]
   ], optionsMulti);
+  const [nonBacked, setNonBacked] = useState<AccountId[]>([]);
 
   const blockDelay = useMemo(
     () => bestNumber && (
@@ -108,6 +114,33 @@ function Parachain ({ bestNumber, className = '', id, isScheduled, lastBacked, l
     [validators]
   );
 
+  const bckRender = useCallback(
+    () => nonBacked.map((id) => (
+      <AddressMini
+        key={id.toString()}
+        value={id}
+      />
+    )),
+    [nonBacked]
+  );
+
+  useEffect((): void => {
+    if (sessionValidators) {
+      if (paraInfo.pendingAvail) {
+        const list = paraInfo.pendingAvail.availabilityVotes.toHuman()
+          .slice(2)
+          .replace(/_/g, '')
+          .split('')
+          .map((c, index) => c === '0' ? sessionValidators[index] : null)
+          .filter((v, index): v is AccountId => !!v && index < sessionValidators.length);
+
+        list.length !== sessionValidators.length && setNonBacked(list);
+      } else {
+        setNonBacked([]);
+      }
+    }
+  }, [paraInfo, sessionValidators]);
+
   return (
     <tr className={className}>
       <td className='number'><h1>{formatNumber(id)}</h1></td>
@@ -125,6 +158,12 @@ function Parachain ({ bestNumber, className = '', id, isScheduled, lastBacked, l
             summary={t<string>('Validators ({{count}})', { replace: { count: formatNumber(validators.length) } })}
           />
         )}
+        {nonBacked && (
+          <Expander
+            renderChildren={bckRender}
+            summary={t<string>('Non-voters ({{count}})', { replace: { count: formatNumber(nonBacked.length) } })}
+          />
+        )}
       </td>
       <td className='start together hash'>{paraInfo.headHex}</td>
       <td className='start media--1100'>
diff --git a/packages/page-parachains/src/Overview/Parachains.tsx b/packages/page-parachains/src/Overview/Parachains.tsx
index e334004a17..d003eebf43 100644
--- a/packages/page-parachains/src/Overview/Parachains.tsx
+++ b/packages/page-parachains/src/Overview/Parachains.tsx
@@ -136,6 +136,7 @@ function Parachains ({ actionsQueue, ids, scheduled }: Props): React.ReactElemen
           nextAction={actionsQueue.find(({ paraIds }) =>
             paraIds.some((p) => p.eq(id))
           )}
+          sessionValidators={validators}
           validators={validatorMap[index]}
         />
       ))}