Add script for showing stats summary

scripts/show-stats.js

@@ -0,0 +1,88 @@
+const redis = require('redis')
+const subDays = require('date-fns/sub_days')
+const prettyBytes = require('pretty-bytes')
+const invariant = require('invariant')
+
+const RedisURL = process.env.REDIS_URL
+
+invariant(
+  RedisURL,
+  'Missing the $REDIS_URL environment variable'
+)
+
+const db = redis.createClient(RedisURL)
+
+const getKeyValues = (keys) =>
+  new Promise((resolve, reject) => {
+    db.mget(keys, (error, values) => {
+      if (error) {
+        reject(error)
+      } else {
+        resolve(values)
+      }
+    })
+  })
+
+const sumKeys = (keys) => getKeyValues(keys).then(sumValues)
+
+const createRange = (start, end) => {
+  const range = []
+
+  while (start < end)
+    range.push(start++)
+
+  return range
+}
+
+const createDayKey = (date) =>
+  `${date.getUTCFullYear()}-${date.getUTCMonth()}-${date.getUTCDate()}`
+
+const createHourKey = (date) =>
+  `${createDayKey(date)}-${date.getUTCHours()}`
+
+const sumValues = (array) =>
+  array.reduce((memo, n) => memo + (parseInt(n, 10) || 0), 0)
+
+const now = new Date
+
+const createPastDays = (n) =>
+  createRange(1, n + 1).map(days => subDays(now, days)).reverse()
+
+const pastSevenDays = createPastDays(7)
+const pastThirtyDays = createPastDays(30)
+
+sumKeys(
+  pastSevenDays.map(date => `stats-requests-${createHourKey(date)}`)
+).then(total => {
+  console.log(
+    'Requests this week: %s',
+    total.toLocaleString()
+  )
+})
+
+sumKeys(
+  pastSevenDays.map(date => `stats-bandwidth-${createHourKey(date)}`)
+).then(total => {
+  console.log(
+    'Bandwidth this week: %s',
+    prettyBytes(total)
+  )
+})
+
+sumKeys(
+  pastThirtyDays.map(date => `stats-requests-${createDayKey(date)}`)
+).then(total => {
+  console.log(
+    'Requests this month: %s',
+    total.toLocaleString()
+  )
+})
+
+sumKeys(
+  pastThirtyDays.map(date => `stats-bandwidth-${createDayKey(date)}`)
+).then(total => {
+  console.log(
+    'Bandwidth this month: %s',
+    prettyBytes(total)
+  )
+})