Add slashing graph

packages/app-staking/src/Query/Validator.tsx

@@ -4,6 +4,7 @@
 
 import { I18nProps } from '@polkadot/react-components/types';
 import { Balance, BlockNumber, Hash, Exposure, SessionIndex } from '@polkadot/types/interfaces';
+import { SessionRewards } from '@polkadot/react-hooks/types';
 
 import BN from 'bn.js';
 import React, { useContext, useEffect, useState } from 'react';
@@ -19,6 +20,7 @@ interface Props extends I18nProps {
   blockCounts?: BN[];
   className?: string;
   currentIndex: SessionIndex;
+  stakingRewards: SessionRewards[];
   startNumber: BlockNumber;
   validatorId: string;
 }
@@ -87,16 +89,17 @@ function extractSplit (values: [BN, Hash, Exposure][], validatorId: string): Spl
     }));
 }
 
-function Validator ({ blockCounts, className, currentIndex, startNumber, t, validatorId }: Props): React.ReactElement<Props> {
+function Validator ({ blockCounts, className, currentIndex, stakingRewards, startNumber, t, validatorId }: Props): React.ReactElement<Props> {
   const { api } = useContext(ApiContext);
   const [blocksLabels, setBlocksLabels] = useState<string[]>([]);
   const [blocksChart, setBlocksChart] = useState<LineData | null>(null);
+  const [{ rewardsChart, rewardsLabels }, setRewardsInfo] = useState<{ rewardsChart: LineData | null; rewardsLabels: string[] }>({ rewardsChart: null, rewardsLabels: [] });
   const [splitChart, setSplitInfo] = useState<SplitData | null>(null);
   const [{ stakeChart, stakeLabels }, setStakeInfo] = useState<{ stakeChart: LineData | null; stakeLabels: string[]}>({ stakeChart: null, stakeLabels: [] });
+  const divisor = new BN('1'.padEnd(formatBalance.getDefaults().decimals + 1, '0'));
 
   useEffect((): void => {
     api.isReady.then(async (): Promise<void> => {
-      const divisor = new BN('1'.padEnd(formatBalance.getDefaults().decimals + 1, '0'));
       const values = await getHistoric<Exposure>(api, 'staking.stakers', [validatorId], {
         interval: (api.consts.babe?.epochDuration as BlockNumber || new BN(500)).muln(2).divn(3),
         max: SESSIONS,
@@ -110,6 +113,24 @@ function Validator ({ blockCounts, className, currentIndex, startNumber, t, vali
     });
   }, []);
 
+  useEffect((): void => {
+    const rewardsLabels: string[] = [];
+    const rewardsChart: LineData = [[]];
+
+    stakingRewards.forEach(({ sessionIndex, slashes }): void => {
+      rewardsLabels.push(formatNumber(sessionIndex));
+      rewardsChart[0].push(
+        slashes.reduce((total: BN, { accountId, amount }): BN => {
+          return accountId.eq(validatorId)
+            ? total.sub(amount)
+            : total;
+        }, new BN(0)).muln(1000).div(divisor).toNumber() / 1000
+      );
+    });
+
+    setRewardsInfo({ rewardsChart, rewardsLabels });
+  }, [stakingRewards]);
+
   useEffect((): void => {
     setBlocksLabels(
       getIndexRange(currentIndex).map((index): string => formatNumber(index))
@@ -137,16 +158,31 @@ function Validator ({ blockCounts, className, currentIndex, startNumber, t, vali
   return (
     <Columar className={className}>
       <Column emptyText={t('Loading block data')}>
-        {blocksChart && (
-          <div className='staking--Chart'>
-            <h1>{t('blocks per session')}</h1>
-            <Chart.Line
-              colors={COLORS_BLOCKS}
-              labels={blocksLabels}
-              legends={[t('blocks'), t('average')]}
-              values={blocksChart}
-            />
-          </div>
+        {(rewardsChart || blocksChart) && (
+          <>
+            {blocksChart && (
+              <div className='staking--Chart'>
+                <h1>{t('blocks per session')}</h1>
+                <Chart.Line
+                  colors={COLORS_BLOCKS}
+                  labels={blocksLabels}
+                  legends={[t('blocks'), t('average')]}
+                  values={blocksChart}
+                />
+              </div>
+            )}
+            {rewardsChart && (
+              <div className='staking--Chart'>
+                <h1>{t('slashed per session')}</h1>
+                <Chart.Line
+                  colors={COLORS_BLOCKS}
+                  labels={rewardsLabels}
+                  legends={[t('slashed'), t('rewarded')]}
+                  values={rewardsChart}
+                />
+              </div>
+            )}
+          </>
         )}
       </Column>
       <Column emptyText={t('Loading staker data')}>

packages/app-staking/src/Query/index.tsx

@@ -47,7 +47,7 @@ interface Props extends I18nProps, ComponentProps, RouteComponentProps<{}> {
 //       />
 //     </Input>
 
-function Query ({ bestNumber, className, stakingOverview, match: { params: { value } }, t }: Props): React.ReactElement<Props> {
+function Query ({ bestNumber, className, stakingRewards, stakingOverview, match: { params: { value } }, t }: Props): React.ReactElement<Props> {
   const [startNumber, setStartNumber] = useState<BlockNumber | undefined>();
   const [validatorId, setValidatorId] = useState<string | null>(value || null);
 
@@ -82,6 +82,7 @@ function Query ({ bestNumber, className, stakingOverview, match: { params: { val
       {value && startNumber && stakingOverview && (
         <Validator
           currentIndex={stakingOverview.currentIndex}
+          stakingRewards={stakingRewards}
           startNumber={startNumber}
           validatorId={value}
         />

packages/app-staking/src/index.tsx

@@ -17,6 +17,7 @@ import { Option } from '@polkadot/types';
 import { HelpOverlay } from '@polkadot/react-components';
 import Tabs from '@polkadot/react-components/Tabs';
 import { ApiContext, withCalls, withMulti, withObservable } from '@polkadot/react-api';
+import { useSessionSlashes } from '@polkadot/react-hooks';
 import accountObservable from '@polkadot/ui-keyring/observable/accounts';
 
 import Accounts from './Actions/Accounts';
@@ -38,6 +39,7 @@ const EMPTY_ALL: [string[], string[]] = [EMPY_ACCOUNTS, EMPY_ACCOUNTS];
 
 function App ({ allAccounts, allStashesAndControllers: [allStashes, allControllers] = EMPTY_ALL, basePath, bestNumber, className, recentlyOnline, stakingOverview, t }: Props): React.ReactElement<Props> {
   const { api } = useContext(ApiContext);
+  const stakingRewards = useSessionSlashes();
   const routeMatch = useRouteMatch({ path: basePath, strict: true });
   const _renderComponent = (Component: React.ComponentType<ComponentProps>, className?: string): () => React.ReactNode => {
     // eslint-disable-next-line react/display-name
@@ -54,6 +56,7 @@ function App ({ allAccounts, allStashesAndControllers: [allStashes, allControlle
           bestNumber={bestNumber}
           className={className}
           recentlyOnline={recentlyOnline}
+          stakingRewards={stakingRewards}
           stakingOverview={stakingOverview}
         />
       );

packages/app-staking/src/types.ts

@@ -4,6 +4,7 @@
 
 import { DerivedFees, DerivedBalances, DerivedHeartbeats, DerivedStakingOverview } from '@polkadot/api-derive/types';
 import { BlockNumber } from '@polkadot/types/interfaces';
+import { SessionRewards } from '@polkadot/react-hooks/types';
 import { SubjectInfo } from '@polkadot/ui-keyring/observable/types';
 
 export type Nominators = Record<string, string[]>;
@@ -15,6 +16,7 @@ export interface ComponentProps {
   bestNumber?: BlockNumber;
   className?: string;
   recentlyOnline?: DerivedHeartbeats;
+  stakingRewards: SessionRewards[];
   stakingOverview?: DerivedStakingOverview;
 }
 

packages/react-hooks/src/index.ts

@@ -4,3 +4,4 @@
 
 export { default as useDebounce } from './debounce';
 export { default as useFavorites } from './favorites';
+export { default as useSessionSlashes } from './sessionSlashes';

packages/react-hooks/src/sessionSlashes.tsx

@@ -0,0 +1,163 @@
+// Copyright 2017-2019 @polkadot/react-components authors & contributors
+// This software may be modified and distributed under the terms
+// of the Apache-2.0 license. See the LICENSE file for details.
+
+import { Balance, BlockNumber, EventRecord, Hash, Header } from '@polkadot/types/interfaces';
+import { Slash, SessionRewards } from './types';
+
+import BN from 'bn.js';
+import { useContext, useEffect, useState } from 'react';
+import store from 'store';
+import { ApiPromise } from '@polkadot/api';
+import { ApiContext } from '@polkadot/react-api';
+import { createType } from '@polkadot/types';
+import { bnMax, u8aToU8a } from '@polkadot/util';
+
+interface SlashSer {
+  accountId: string;
+  amount: string;
+}
+
+interface SessionResultSer {
+  blockHash: string;
+  blockNumber: string;
+  isEventsEmpty: boolean;
+  reward: string;
+  sessionIndex: string;
+  slashes: SlashSer[];
+}
+
+// assuming 4 hrs sessions, we grab results for 10 days (+2 for at-start throw-away)
+const MAX_SESSIONS = 10 * (24 / 4) + 2;
+
+function getStorage (storageKey: string): SessionRewards[] {
+  const sessions: SessionResultSer[] = store.get(storageKey, []);
+
+  return sessions.map(({ blockHash, blockNumber, isEventsEmpty, reward, sessionIndex, slashes }): SessionRewards => ({
+    blockHash: createType('Hash', blockHash),
+    blockNumber: createType('BlockNumber', blockNumber),
+    isEventsEmpty,
+    reward: createType('Balance', reward),
+    sessionIndex: createType('SessionIndex', sessionIndex),
+    slashes: slashes.map(({ accountId, amount }): Slash => ({
+      accountId: createType('AccountId', accountId),
+      amount: createType('Balance', amount)
+    }))
+  }));
+}
+
+function setStorage (storageKey: string, sessions: SessionRewards[]): SessionResultSer[] {
+  return store.set(
+    storageKey,
+    sessions
+      .map(({ blockHash, blockNumber, isEventsEmpty, reward, sessionIndex, slashes }): SessionResultSer => ({
+        blockHash: blockHash.toHex(),
+        blockNumber: blockNumber.toHex(),
+        isEventsEmpty,
+        reward: reward.toHex(),
+        sessionIndex: sessionIndex.toHex(),
+        slashes: slashes.map(({ accountId, amount }): SlashSer => ({
+          accountId: accountId.toString(),
+          amount: amount.toHex()
+        }))
+      }))
+      .slice(0, MAX_SESSIONS + 1)
+  );
+}
+
+function mergeResults (sessions: SessionRewards[], newSessions: SessionRewards[]): SessionRewards[] {
+  const tmp = sessions
+    .concat(newSessions)
+    .sort((a, b): number => a.blockNumber.cmp(b.blockNumber));
+
+  return tmp.filter(({ sessionIndex }, index): boolean =>
+    index === 0
+      // for the first, always use it
+      ? true
+      // if the prev has the same sessionIndex, ignore this one
+      : !tmp[index - 1].sessionIndex.eq(sessionIndex)
+  );
+}
+
+async function loadSome (api: ApiPromise, fromHash: Hash, toHash: Hash): Promise<SessionRewards[]> {
+  const results = await api.rpc.state.queryStorage([api.query.session.currentIndex.key()], fromHash, toHash);
+  const headers = await Promise.all(
+    results.map(({ block }): Promise<Header> => api.rpc.chain.getHeader(block))
+  );
+  const events: EventRecord[][] = await Promise.all(
+    results.map(({ block }): Promise<EventRecord[]> =>
+      (api.query.system.events.at(block) as unknown as Promise<EventRecord[]>)
+        .then((records): EventRecord[] =>
+          records.filter(({ event: { section } }): boolean => section === 'staking')
+        )
+        .catch((): EventRecord[] => []) // undecodable may throw
+    )
+  );
+  const slashes: Slash[][] = events.map((info): Slash[] =>
+    info
+      .filter(({ event: { method } }): boolean => method === 'Slash')
+      .map(({ event: { data: [accountId, amount] } }): Slash => ({
+        accountId: accountId as any,
+        amount: amount as any
+      }))
+  );
+  const rewards: (Balance | undefined)[] = events.map((info): Balance | undefined => {
+    const rewards = info.filter(({ event: { method } }): boolean => method === 'Reward');
+
+    return rewards[0]?.event?.data[0] as Balance;
+  });
+
+  return results.map(({ changes: [[, value]] }, index): SessionRewards => ({
+    blockHash: headers[index].hash,
+    blockNumber: headers[index].number.unwrap(),
+    isEventsEmpty: events[index].length === 0,
+    reward: rewards[index] || createType('Balance'),
+    sessionIndex: createType('SessionIndex', u8aToU8a(value.unwrap())),
+    slashes: slashes[index]
+  }));
+}
+
+export default function useSessionSlashes (maxSessions = MAX_SESSIONS): SessionRewards[] {
+  const { api } = useContext(ApiContext);
+  const STORAGE_KEY = `hooks:sessionSlashes:${api.genesisHash}`;
+  const [results, setResults] = useState<SessionRewards[]>(getStorage(STORAGE_KEY));
+  const [filtered, setFiltered] = useState<SessionRewards[]>([]);
+
+  useEffect((): void => {
+    let workQueue = results;
+
+    api.isReady.then(async (): Promise<void> => {
+      const sessionLength = (api.consts.babe?.epochDuration as BlockNumber || new BN(500));
+      const count = sessionLength.muln(maxSessions).divn(10).toNumber();
+      const bestHeader = await api.rpc.chain.getHeader();
+      let toHash = bestHeader.hash;
+      let toNumber = bestHeader.number.unwrap().toBn();
+      let fromHash = api.genesisHash;
+      let fromNumber = bnMax(toNumber.subn(count), new BN(1));
+
+      while (true) {
+        fromHash = await api.rpc.chain.getBlockHash(fromNumber as any);
+
+        const newQueue = await loadSome(api, fromHash, toHash);
+
+        workQueue = mergeResults(workQueue, newQueue);
+        toHash = fromHash;
+        toNumber = fromNumber;
+        fromNumber = bnMax(toNumber.subn(count), new BN(1));
+
+        setStorage(STORAGE_KEY, workQueue);
+        setResults(workQueue);
+
+        if (fromNumber.eqn(1) || (workQueue.length > maxSessions)) {
+          break;
+        }
+      }
+    });
+  }, []);
+
+  useEffect((): void => {
+    setFiltered(results.filter(({ isEventsEmpty }): boolean => !isEventsEmpty));
+  }, [results]);
+
+  return filtered;
+}

packages/react-hooks/src/types.ts

@@ -0,0 +1,19 @@
+// Copyright 2017-2019 @polkadot/react-components authors & contributors
+// This software may be modified and distributed under the terms
+// of the Apache-2.0 license. See the LICENSE file for details.
+
+import { AccountId, Balance, BlockNumber, Hash, SessionIndex } from '@polkadot/types/interfaces';
+
+export interface Slash {
+  accountId: AccountId;
+  amount: Balance;
+}
+
+export interface SessionRewards {
+  blockHash: Hash;
+  blockNumber: BlockNumber;
+  isEventsEmpty: boolean;
+  reward: Balance;
+  sessionIndex: SessionIndex;
+  slashes: Slash[];
+}