feat: created migration to add a schema_version column on the user_config table

feat: adapted the new settings loader to work with the db instead of
the json file

fix: fixed the schema migration file

fix: updated accounts to work with the db

fix: fetch only data with the new schema version

fix: change the account saving process so there's no more than one
account record

chore: removed unnecessary TODO comments

fix: replaced an error throwing with a Promise reject

fix: when looking for the latest config, don't limit it to the new ones

fix: fix function names on gql server

fix: remove duplicate import

fix: return an empty object when there's no schema_version 2 config yet

lib/new-admin/graphql/schema.js

@@ -258,8 +258,8 @@ const resolvers = {
       serverLogs.getServerLogs(from, until, limit, offset),
     transactions: (...[, { from, until, limit, offset }]) =>
       transactions.batch(from, until, limit, offset),
-    config: () => settingsLoader.getConfig(),
-    accounts: () => settingsLoader.getAccounts()
+    config: () => settingsLoader.loadLatestConfig(),
+    accounts: () => settingsLoader.loadAccounts()
   },
   Mutation: {
     machineAction: (...[, { deviceId, action, cassette1, cassette2 }]) => machineAction({ deviceId, action, cassette1, cassette2 }),

lib/new-settings-loader.js

@@ -1,71 +1,111 @@
 const _ = require('lodash/fp')
-const low = require('lowdb')
-const FileAsync = require('lowdb/adapters/FileAsync')
+const db = require('./db')
 
-const adapter = new FileAsync('db.json')
-let db = null
-
-// TODO new-admin save to actual db, like the old settings
-low(adapter).then(it => {
-  db = it
-})
+const NEW_SETTINGS_LOADER_SCHEMA_VERSION = 2
 
 function saveAccounts (accountsToSave) {
-  const currentState = db.getState() || {}
-  const accounts = currentState.accounts || {}
+  const sql = `update user_config set data = $2, valid = $3, schema_version = $4 where type = $1;
+  insert into user_config (type, data, valid, schema_version)
+  select $1, $2, $3, $4 where $1 not in (select type from user_config)`
 
-  const newAccounts = _.assign(accounts)(accountsToSave)
-
-  const newState = _.set('accounts', newAccounts, currentState)
-  db.setState(newState)
-  return db.write()
-    .then(() => newState.accounts)
+  return loadAccounts()
+    .then(currentAccounts => {
+      const newAccounts = _.assign(currentAccounts, accountsToSave)
+      return db.none(sql, ['accounts', { accounts: newAccounts }, true, NEW_SETTINGS_LOADER_SCHEMA_VERSION])
+    })
 }
 
-function getAccounts () {
-  const state = db.getState()
-  return state ? state.accounts : null
+function loadAccounts () {
+  const toFields = fieldArr => _.fromPairs(_.map(r => [r.code, r.value], fieldArr))
+  const toPairs = r => [r.code, toFields(r.fields)]
+
+  const sql = `select data
+  from user_config
+  where type=$1
+  and schema_version=$2
+  and valid
+  order by id desc
+  limit 1`
+
+  return db.oneOrNone(sql, ['accounts', NEW_SETTINGS_LOADER_SCHEMA_VERSION])
+    .then(row => {
+      if (!row) return {}
+      return _.fromPairs(_.map(toPairs, row.data.accounts))
+    })
 }
 
 function saveConfig (config) {
-  const currentState = db.getState() || {}
-  const currentConfig = currentState.config || {}
+  const sql = 'insert into user_config (type, data, valid, schema_version) values ($1, $2, $3, $4)'
+
+  return loadLatestConfig()
+    .then(currentConfig => {
       const newConfig = _.assign(currentConfig, config)
-
-  const newState = _.set('config', newConfig, currentState)
-  db.setState(newState)
-  return db.write()
-    .then(() => newState.config)
-}
-
-function getConfig () {
-  const state = db.getState()
-  return (state && state.config) || {}
+      return db.none(sql, ['config', { config: newConfig }, true, NEW_SETTINGS_LOADER_SCHEMA_VERSION])
+    })
 }
 
 function loadLatest () {
-  return new Promise((resolve) => {
-    if (!db) {
-      setTimeout(() => {
-        return resolve(db.getState())
-      }, 1000)
-    } else {
-      return resolve(db.getState())
+  return Promise.all([loadLatestConfig(), loadAccounts()])
+    .then(([config, accounts]) => ({
+      config,
+      accounts
+    }))
+}
+
+function loadLatestConfig () {
+  const sql = `select data
+  from user_config
+  where type=$1
+  and schema_version=$2
+  and valid
+  order by id desc
+  limit 1`
+
+  return db.oneOrNone(sql, ['config', NEW_SETTINGS_LOADER_SCHEMA_VERSION])
+    .then(row => !row ? {} : row.data.config)
+    .catch(err => {
+      if (err.name === 'QueryResultError') {
+        throw new Error('lamassu-server is not configured')
       }
+
+      throw err
+    })
+}
+
+function loadConfig (versionId) {
+  const sql = `select data
+  from user_config
+  where id=$1
+  and type=$2
+  and schema_version=$3
+  and valid`
+
+  return db.one(sql, [versionId, 'config', NEW_SETTINGS_LOADER_SCHEMA_VERSION])
+    .then(row => row.data.config)
+    .catch(err => {
+      if (err.name === 'QueryResultError') {
+        throw new Error('No such config version: ' + versionId)
+      }
+
+      throw err
     })
 }
 
-// TODO new-admin: grab correct version
 function load (versionId) {
-  return new Promise((resolve) => {
-    if (!db) {
-      setTimeout(() => {
-        return resolve(db.getState())
-      }, 1000)
-    } else {
-      return resolve(db.getState())
-    }
-  })
+  if (!versionId) Promise.reject('versionId is required')
+  
+  return Promise.all([loadConfig(versionId), loadAccounts()])
+    .then(([config, accounts]) => ({
+      config,
+      accounts
+    }))
 }
 
-module.exports = { getConfig, saveConfig, saveAccounts, getAccounts, loadLatest, load }
+module.exports = {
+  saveConfig,
+  saveAccounts,
+  loadAccounts,
+  loadLatest,
+  loadLatestConfig,
+  load
+}

migrations/1595295132361-schema-version-on-user-config.js

@@ -0,0 +1,13 @@
+const db = require('./db')
+
+module.exports.up = function (next) {
+  var sql = [
+    'alter table user_config add column schema_version smallint DEFAULT 1'
+  ]
+
+  db.multi(sql, next)
+}
+
+module.exports.down = function (next) {
+  next()
+}