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Derive gas price estimate from previous transactions

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Return the 50th percentile lowest gas price of the previous 20 blocks.
This commit is contained in:
Dan Finlay 2018-01-05 21:24:20 -08:00
parent 571f6723a6
commit 4bca98d588
4 changed files with 24 additions and 2 deletions
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1
app/scripts/controllers/blacklist.js
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@ -57,3 +57,4 @@ class BlacklistController {
}
module.exports = BlacklistController

3
app/scripts/controllers/transactions.js
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@ -32,6 +32,7 @@ module.exports = class TransactionController extends EventEmitter {
this.provider = opts.provider
this.blockTracker = opts.blockTracker
this.signEthTx = opts.signTransaction
this.getGasPrice = opts.getGasPrice
this.memStore = new ObservableStore({})
this.query = new EthQuery(this.provider)
@ -179,7 +180,7 @@ module.exports = class TransactionController extends EventEmitter {
// ensure value
txMeta.gasPriceSpecified = Boolean(txParams.gasPrice)
txMeta.nonceSpecified = Boolean(txParams.nonce)
const gasPrice = txParams.gasPrice || await this.query.gasPrice()
const gasPrice = txParams.gasPrice || this.getGasPrice()
txParams.gasPrice = ethUtil.addHexPrefix(gasPrice.toString(16))
txParams.value = txParams.value || '0x0'
// set gasLimit

21
app/scripts/metamask-controller.js
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@ -35,13 +35,15 @@ const accountImporter = require('./account-import-strategies')
const getBuyEthUrl = require('./lib/buy-eth-url')
const Mutex = require('await-semaphore').Mutex
const version = require('../manifest.json').version
const BN = require('ethereumjs-util').BN
const GWEI_BN = new BN('1000000000')
const percentile = require('percentile')
module.exports = class MetamaskController extends EventEmitter {
constructor (opts) {
super()
this.sendUpdate = debounce(this.privateSendUpdate.bind(this), 200)
this.opts = opts
@ -139,6 +141,7 @@ module.exports = class MetamaskController extends EventEmitter {
provider: this.provider,
blockTracker: this.blockTracker,
ethQuery: this.ethQuery,
getGasPrice: this.getGasPrice.bind(this),
})
this.txController.on('newUnapprovedTx', opts.showUnapprovedTx.bind(opts))
@ -484,6 +487,22 @@ module.exports = class MetamaskController extends EventEmitter {
this.emit('update', this.getState())
}
getGasPrice () {
const { recentBlocksController } = this
console.dir(recentBlocksController)
const { recentBlocks } = recentBlocksController.store.getState()
console.dir(recentBlocks)
const lowestPrices = recentBlocks.map((block) => {
return block.transactions
.sort((a, b) => {
return a.gt(b) ? 1 : -1
})[0]
})
.map(number => number.div(GWEI_BN).toNumber())
console.dir({ lowestPrices })
return percentile(50, lowestPrices)
}
//
// Vault Management
//

1
package.json
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@ -119,6 +119,7 @@
"obj-multiplex": "^1.0.0",
"obs-store": "^3.0.0",
"once": "^1.3.3",
"percentile": "^1.2.0",
"ping-pong-stream": "^1.0.0",
"pojo-migrator": "^2.1.0",
"polyfill-crypto.getrandomvalues": "^1.0.0",