Create domain models

First step for creating a layered architecture for connector
interledger-deprecated/five-bells-ledger#112

src/controllers/metadata.js

@@ -1,16 +1,6 @@
 'use strict'
-const config = require('../services/config')
 
-const metadata = {
-  public_key: config.getIn(['keys', 'ed25519', 'public']),
-  urls: {
-    health: '/health',
-    pairs: '/pairs',
-    payment: '/payments/:uuid',
-    quote: '/quote',
-    notifications: '/notifications'
-  }
-}
+const model = require('../models/metadata')
 
 /**
  * @api {get} / Get the server metadata
@@ -22,4 +12,4 @@ const metadata = {
  *
  * @returns {void}
  */
-exports.getResource = function * () { this.body = metadata }
+exports.getResource = function * () { this.body = model.getMetadata() }

src/controllers/notifications.js

@@ -1,8 +1,8 @@
 'use strict'
 
 const requestUtil = require('five-bells-shared/utils/request')
-const Payments = require('../services/payments')
 const log = require('../services/log')('notifications')
+const model = require('../models/notifications')
 
 /* eslint-disable */
 /**
@@ -59,13 +59,9 @@ const log = require('../services/log')('notifications')
 /* eslint-enable */
 
 exports.post = function * postNotification () {
-  let notification = yield requestUtil.validateBody(this, 'Notification')
-
+  const notification = yield requestUtil.validateBody(this, 'Notification')
   log.debug('Got notification: ' + JSON.stringify(notification))
-
-  if (notification.event === 'transfer.update') {
-    yield Payments.updateTransfer(notification.resource, notification.related_resources)
-  }
+  yield model.processNotification(notification)
 
   this.status = 200
 }

src/controllers/pairs.js

@@ -1,6 +1,6 @@
 'use strict'
 
-const config = require('../services/config')
+const model = require('../models/pairs')
 
 /* eslint-disable */
 /**
@@ -36,16 +36,5 @@ const config = require('../services/config')
  */
 /* eslint-enable */
 exports.getCollection = function * getCollection () {
-  let pairs = config.get('tradingPairs').map(function (pair) {
-    let currencies = pair.map(function (s) {
-      return s.split('@')
-    })
-    return {
-      source_asset: currencies[0][0],
-      source_ledger: currencies[0][1],
-      destination_asset: currencies[1][0],
-      destination_ledger: currencies[1][1]
-    }
-  })
-  this.body = pairs
+  this.body = model.getPairs()
 }

src/controllers/quote.js

@@ -1,16 +1,6 @@
 'use strict'
 
-const request = require('co-request')
-const BigNumber = require('bignumber.js')
-const config = require('../services/config')
-const log = require('../services/log')('quote')
-const backend = require('../services/backend')
-const ledgers = require('../services/ledgers')
-const balanceCache = require('../services/balance-cache')
-const UnacceptableExpiryError = require('../errors/unacceptable-expiry-error')
-const UnacceptableAmountError = require('../errors/unacceptable-amount-error')
-const InvalidURIParameterError = require('five-bells-shared').InvalidUriParameterError
-const ExternalError = require('../errors/external-error')
+const model = require('../models/quote')
 
 /* eslint-disable */
 /**
@@ -119,130 +109,6 @@ const ExternalError = require('../errors/external-error')
 /* eslint-enable */
 
 exports.get = function * () {
-  const query = yield makeQuoteQuery(this.query)
-  const quote = yield backend.getQuote(makeQuoteArgs(query))
-
-  const sourceBalance = yield balanceCache.get(query.source_ledger)
-  const sourceAmount = new BigNumber(quote.source_amount)
-  if (sourceBalance.lessThan(sourceAmount)) {
-    throw new UnacceptableAmountError('Insufficient liquidity in market maker account')
-  }
-
-  log.debug('' +
-    quote.source_amount + ' ' +
-    query.source_ledger + ' => ' +
-    quote.destination_amount + ' ' +
-    query.destination_ledger)
-
-  this.body = makePaymentTemplate(query, quote)
+  this.body = yield model.getQuote(this.query)
 }
 
-function * makeQuoteQuery (params) {
-  // TODO: include the expiry duration in the quote logic
-  let destinationExpiryDuration = parseFloat(params.destination_expiry_duration)
-  let sourceExpiryDuration = parseFloat(params.source_expiry_duration)
-
-  // Check destination_expiry_duration
-  if (destinationExpiryDuration) {
-    if (destinationExpiryDuration > config.getIn(['expiry', 'maxHoldTime'])) {
-      throw new UnacceptableExpiryError('Destination expiry duration ' +
-        'is too long, destinationExpiryDuration: ' + destinationExpiryDuration +
-        ', maxHoldTime: ' + config.getIn(['expiry', 'maxHoldTime']))
-    }
-  } else if (sourceExpiryDuration) {
-    destinationExpiryDuration = sourceExpiryDuration - config.getIn(['expiry', 'minMessageWindow'])
-  } else {
-    destinationExpiryDuration = config.getIn(['expiry', 'maxHoldTime'])
-  }
-
-  // Check difference between destination_expiry_duration
-  // and source_expiry_duration
-  if (sourceExpiryDuration) {
-    if (sourceExpiryDuration - destinationExpiryDuration <
-      config.getIn(['expiry', 'minMessageWindow'])) {
-      throw new UnacceptableExpiryError('The difference between the ' +
-        'destination expiry duration and the source expiry duration ' +
-        'is insufficient to ensure that we can execute the ' +
-        'source transfers')
-    }
-  } else {
-    sourceExpiryDuration = destinationExpiryDuration + config.getIn(['expiry', 'minMessageWindow'])
-  }
-
-  let source_ledger = params.source_ledger
-  if (!source_ledger) {
-    if (params.source_account) source_ledger = yield getAccountLedger(params.source_account)
-    else throw new InvalidURIParameterError('Missing required parameter: source_ledger or source_account')
-  }
-
-  let destination_ledger = params.destination_ledger
-  if (!destination_ledger) {
-    if (params.destination_account) destination_ledger = yield getAccountLedger(params.destination_account)
-    else throw new InvalidURIParameterError('Missing required parameter: destination_ledger or destination_account')
-  }
-
-  return {
-    destinationExpiryDuration: destinationExpiryDuration,
-    sourceExpiryDuration: sourceExpiryDuration,
-    source_amount: params.source_amount,
-    destination_amount: params.destination_amount,
-    source_ledger: source_ledger,
-    destination_ledger: destination_ledger,
-    source_account: params.source_account || null,
-    destination_account: params.destination_account || null
-  }
-}
-
-function makeQuoteArgs (query) {
-  return {
-    source_ledger: query.source_ledger,
-    destination_ledger: query.destination_ledger,
-    source_amount: query.source_amount,
-    destination_amount: query.destination_amount
-  }
-}
-
-function makePaymentTemplate (query, quote) {
-  const source_amount = quote.source_amount
-  const destination_amount = quote.destination_amount
-  const payment = {
-    source_transfers: [{
-      type: ledgers.getType(query.source_ledger),
-      ledger: query.source_ledger,
-      debits: [{
-        account: query.source_account,
-        amount: source_amount
-      }],
-      credits: [
-        ledgers.makeFundTemplate(query.source_ledger, {amount: source_amount})
-      ],
-      expiry_duration: String(query.sourceExpiryDuration)
-    }],
-    destination_transfers: [{
-      type: ledgers.getType(query.destination_ledger),
-      ledger: query.destination_ledger,
-      debits: [
-        ledgers.makeFundTemplate(query.destination_ledger, {amount: destination_amount})
-      ],
-      credits: [{
-        account: query.destination_account,
-        amount: destination_amount
-      }],
-      expiry_duration: String(query.destinationExpiryDuration)
-    }]
-  }
-  return payment
-}
-
-function * getAccountLedger (account) {
-  const res = yield request({
-    method: 'get',
-    uri: account,
-    json: true
-  })
-  const ledger = res.body && res.body.ledger
-  if (res.statusCode !== 200 || !ledger) {
-    throw new ExternalError('Unable to identify ledger from account: ' + account)
-  }
-  return ledger
-}

src/models/metadata.js

@@ -0,0 +1,20 @@
+'use strict'
+
+const config = require('../services/config')
+
+function getMetadata () {
+  return {
+    public_key: config.getIn(['keys', 'ed25519', 'public']),
+    urls: {
+      health: '/health',
+      pairs: '/pairs',
+      payment: '/payments/:uuid',
+      quote: '/quote',
+      notifications: '/notifications'
+    }
+  }
+}
+
+module.exports = {
+  getMetadata: getMetadata
+}

src/models/notifications.js

@@ -0,0 +1,13 @@
+'use strict'
+
+const Payments = require('../services/payments')
+
+function * processNotification (notification) {
+  if (notification.event === 'transfer.update') {
+    yield Payments.updateTransfer(notification.resource, notification.related_resources)
+  }
+}
+
+module.exports = {
+  processNotification: processNotification
+}

src/models/pairs.js

@@ -0,0 +1,22 @@
+'use strict'
+
+const config = require('../services/config')
+
+function getPairs () {
+  const tradingPairs = config.get('tradingPairs')
+  return tradingPairs.map((pair) => {
+    const currencies = pair.map(function (currencyLedgerString) {
+      return currencyLedgerString.split('@')
+    })
+    return {
+      source_asset: currencies[0][0],
+      source_ledger: currencies[0][1],
+      destination_asset: currencies[1][0],
+      destination_ledger: currencies[1][1]
+    }
+  })
+}
+
+module.exports = {
+  getPairs: getPairs
+}