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-rw-r--r--app/scripts/controllers/recent-blocks.js79
1 files changed, 72 insertions, 7 deletions
diff --git a/app/scripts/controllers/recent-blocks.js b/app/scripts/controllers/recent-blocks.js
index 4a906261e..c65c2b1c4 100644
--- a/app/scripts/controllers/recent-blocks.js
+++ b/app/scripts/controllers/recent-blocks.js
@@ -1,11 +1,13 @@
const ObservableStore = require('obs-store')
const extend = require('xtend')
+const BN = require('ethereumjs-util').BN
class RecentBlocksController {
constructor (opts = {}) {
- const { blockTracker } = opts
+ const { blockTracker, ethQuery } = opts
this.blockTracker = blockTracker
+ this.ethQuery = ethQuery
this.historyLength = opts.historyLength || 40
const initState = extend({
@@ -14,6 +16,7 @@ class RecentBlocksController {
this.store = new ObservableStore(initState)
this.blockTracker.on('block', this.processBlock.bind(this))
+ this.backfill()
}
resetState () {
@@ -23,12 +26,7 @@ class RecentBlocksController {
}
processBlock (newBlock) {
- const block = extend(newBlock, {
- gasPrices: newBlock.transactions.map((tx) => {
- return tx.gasPrice
- }),
- })
- delete block.transactions
+ const block = this.mapTransactionsToPrices(newBlock)
const state = this.store.getState()
state.recentBlocks.push(block)
@@ -39,6 +37,73 @@ class RecentBlocksController {
this.store.updateState(state)
}
+
+ backfillBlock (newBlock) {
+ const block = this.mapTransactionsToPrices(newBlock)
+
+ const state = this.store.getState()
+
+ if (state.recentBlocks.length < this.historyLength) {
+ state.recentBlocks.unshift(block)
+ }
+
+ this.store.updateState(state)
+ }
+
+ mapTransactionsToPrices (newBlock) {
+ const block = extend(newBlock, {
+ gasPrices: newBlock.transactions.map((tx) => {
+ return tx.gasPrice
+ }),
+ })
+ delete block.transactions
+ return block
+ }
+
+ async backfill() {
+ this.blockTracker.once('block', async (block) => {
+ let blockNum = block.number
+ let recentBlocks
+ let state = this.store.getState()
+ recentBlocks = state.recentBlocks
+
+ while (recentBlocks.length < this.historyLength) {
+ try {
+ let blockNumBn = new BN(blockNum.substr(2), 16)
+ const newNum = blockNumBn.subn(1).toString(10)
+ const newBlock = await this.getBlockByNumber(newNum)
+
+ if (newBlock) {
+ this.backfillBlock(newBlock)
+ blockNum = newBlock.number
+ }
+
+ state = this.store.getState()
+ recentBlocks = state.recentBlocks
+ } catch (e) {
+ log.error(e)
+ }
+ await this.wait()
+ }
+ })
+ }
+
+ async wait () {
+ return new Promise((resolve) => {
+ setTimeout(resolve, 100)
+ })
+ }
+
+ async getBlockByNumber (number) {
+ const bn = new BN(number)
+ return new Promise((resolve, reject) => {
+ this.ethQuery.getBlockByNumber('0x' + bn.toString(16), true, (err, block) => {
+ if (err) reject(err)
+ resolve(block)
+ })
+ })
+ }
+
}
module.exports = RecentBlocksController