fix(@cockpit/explorers): consistently display "Mined on" timestamps

Adjust the API endpoints to augment transaction objects with a timestamp
property from their corresponding blocks. This removes the necessity to copy
the timestamp property from a block to its transactions in the client.

Introduce a `formatTimestampForDisplay` util function in Cockpit for
consistently transforming timestamps into relative or absolute dates, depending
on whether a date is sometime during the last day.

packages/embark-blockchain-connector/src/index.js

@@ -610,6 +610,7 @@ class BlockchainConnector {
               .then(receipts => {
                 block.transactions.forEach((tx, index) => {
                   tx['receipt'] = receipts[index];
+                  tx['timestamp'] = block.timestamp;
                 });
                 blocks.push(block);
                 eachCb();
@@ -655,7 +656,15 @@ class BlockchainConnector {
   }
 
   getBlock(blockNumber, cb) {
-    this.web3.eth.getBlock(blockNumber, true, cb);
+    this.web3.eth.getBlock(blockNumber, true, (err, block) => {
+      if (err) return cb(err);
+      if (block.transactions && block.transactions.length) {
+        block.transactions.forEach(tx => {
+          tx.timestamp = block.timestamp;
+        });
+      }
+      cb(null, block);
+    });
   }
 
   getTransactionByHash(hash, cb) {

packages/embark-ui/src/components/Blocks.js

@@ -3,6 +3,7 @@ import {Link} from "react-router-dom";
 import {Row, Col, Card, CardHeader, CardBody} from 'reactstrap';
 import PropTypes from 'prop-types';
 import Pagination from './Pagination';
+import {formatTimestampForDisplay} from '../utils/presentation';
 
 import CardTitleIdenticon from './CardTitleIdenticon';
 
@@ -25,7 +26,7 @@ const Blocks = ({blocks, changePage, currentPage, numberOfPages}) => (
               <Row>
                 <Col>
                   <strong>Mined on:</strong>
-                  <div>{new Date(block.timestamp * 1000).toLocaleString()}</div>
+                  <div>{formatTimestampForDisplay(block.timestamp)}</div>
                 </Col>
                 <Col>
                   <strong>Gas Used</strong>

packages/embark-ui/src/components/Transactions.js

@@ -2,8 +2,7 @@ import React from 'react';
 import {Link} from "react-router-dom";
 import {Row, Col, Card, CardHeader, CardBody} from 'reactstrap';
 import PropTypes from 'prop-types';
-import isToday from 'date-fns/is_today';
+import {formatTimestampForDisplay} from '../utils/presentation';
-import distanceInWordsToNow from 'date-fns/distance_in_words_to_now';
 
 import DebugButton from './DebugButton';
 import CardTitleIdenticon from './CardTitleIdenticon';
@@ -50,12 +49,7 @@ const Transactions = ({transactions, contracts, changePage, currentPage, numberO
                 </Col>
                 <Col md={6}>
                   <strong>Mined on:</strong>
-                  <div>
+                  <div>{formatTimestampForDisplay(transaction.timestamp)}</div>
-                    {isToday(new Date(transaction.timestamp * 1000)) ?
-                      distanceInWordsToNow(new Date(transaction.timestamp * 1000), {addSuffix: true}) :
-                      new Date(transaction.timestamp * 1000).toLocaleString()
-                    }
-                  </div>
                 </Col>
               </Row>
             </div>

packages/embark-ui/src/containers/TransactionsContainer.js

@@ -97,7 +97,6 @@ class TransactionsContainer extends Component {
       const txsLength = txs.length;
       block.transactions.forEach((tx, idx) => {
         txs[txsLength + idx + offset] = tx;
-        txs[txsLength + idx + offset].timestamp = block.timestamp;
       });
       return txs;
     }, []);

packages/embark-ui/src/utils/presentation.js

@@ -1,3 +1,6 @@
+import isToday from 'date-fns/is_today';
+import distanceInWordsToNow from 'date-fns/distance_in_words_to_now';
+
 export function formatContractForDisplay(contract) {
   let address = (contract.address || contract.deployedAddress);
   let state = 'Deployed';
@@ -17,3 +20,10 @@ export function formatContractForDisplay(contract) {
   }
   return {address, state, stateColor};
 }
+
+export function formatTimestampForDisplay(timestamp) {
+  if (isToday(new Date(timestamp * 1000))) {
+    return distanceInWordsToNow(new Date(timestamp * 1000), {addSuffix: true});
+  }
+  return new Date(timestamp * 1000).toLocaleString();
+}