Database refactoring.

lib/prisma.js

@@ -0,0 +1,200 @@
+import { PrismaClient } from '@prisma/client';
+import chalk from 'chalk';
+import moment from 'moment-timezone';
+import debug from 'debug';
+import { PRISMA, MYSQL, POSTGRESQL } from 'lib/db';
+import { FILTER_IGNORED } from 'lib/constants';
+import { getDatabaseType } from 'lib/db';
+
+const MYSQL_DATE_FORMATS = {
+  minute: '%Y-%m-%d %H:%i:00',
+  hour: '%Y-%m-%d %H:00:00',
+  day: '%Y-%m-%d',
+  month: '%Y-%m-01',
+  year: '%Y-01-01',
+};
+
+const POSTGRESQL_DATE_FORMATS = {
+  minute: 'YYYY-MM-DD HH24:MI:00',
+  hour: 'YYYY-MM-DD HH24:00:00',
+  day: 'YYYY-MM-DD',
+  month: 'YYYY-MM-01',
+  year: 'YYYY-01-01',
+};
+
+const log = debug('prisma');
+
+const PRISMA_OPTIONS = {
+  log: [
+    {
+      emit: 'event',
+      level: 'query',
+    },
+  ],
+};
+
+function logQuery(e) {
+  log(chalk.yellow(e.params), '->', e.query, chalk.greenBright(`${e.duration}ms`));
+}
+
+function getClient(options) {
+  const prisma = new PrismaClient(options);
+
+  if (process.env.LOG_QUERY) {
+    prisma.$on('query', logQuery);
+  }
+
+  if (process.env.NODE_ENV !== 'production') {
+    global[PRISMA] = prisma;
+  }
+
+  log('Prisma initialized');
+
+  return prisma;
+}
+
+function getDateQuery(field, unit, timezone) {
+  const db = getDatabaseType(process.env.DATABASE_URL);
+
+  if (db === POSTGRESQL) {
+    if (timezone) {
+      return `to_char(date_trunc('${unit}', ${field} at time zone '${timezone}'), '${POSTGRESQL_DATE_FORMATS[unit]}')`;
+    }
+    return `to_char(date_trunc('${unit}', ${field}), '${POSTGRESQL_DATE_FORMATS[unit]}')`;
+  }
+
+  if (db === MYSQL) {
+    if (timezone) {
+      const tz = moment.tz(timezone).format('Z');
+
+      return `date_format(convert_tz(${field},'+00:00','${tz}'), '${MYSQL_DATE_FORMATS[unit]}')`;
+    }
+
+    return `date_format(${field}, '${MYSQL_DATE_FORMATS[unit]}')`;
+  }
+}
+
+function getTimestampInterval(field) {
+  const db = getDatabaseType(process.env.DATABASE_URL);
+
+  if (db === POSTGRESQL) {
+    return `floor(extract(epoch from max(${field}) - min(${field})))`;
+  }
+
+  if (db === MYSQL) {
+    return `floor(unix_timestamp(max(${field})) - unix_timestamp(min(${field})))`;
+  }
+}
+
+function getFilterQuery(table, column, filters = {}, params = []) {
+  const query = Object.keys(filters).reduce((arr, key) => {
+    const filter = filters[key];
+
+    if (filter === undefined || filter === FILTER_IGNORED) {
+      return arr;
+    }
+
+    switch (key) {
+      case 'url':
+        if (table === 'pageview' || table === 'event') {
+          arr.push(`and ${table}.${key}=$${params.length + 1}`);
+          params.push(decodeURIComponent(filter));
+        }
+        break;
+
+      case 'os':
+      case 'browser':
+      case 'device':
+      case 'country':
+        if (table === 'session') {
+          arr.push(`and ${table}.${key}=$${params.length + 1}`);
+          params.push(decodeURIComponent(filter));
+        }
+        break;
+
+      case 'event_name':
+        if (table === 'event') {
+          arr.push(`and ${table}.${key}=$${params.length + 1}`);
+          params.push(decodeURIComponent(filter));
+        }
+        break;
+
+      case 'referrer':
+        if (table === 'pageview' || table === 'event') {
+          arr.push(`and ${table}.referrer like $${params.length + 1}`);
+          params.push(`%${decodeURIComponent(filter)}%`);
+        }
+        break;
+
+      case 'domain':
+        if (table === 'pageview') {
+          arr.push(`and ${table}.referrer not like $${params.length + 1}`);
+          arr.push(`and ${table}.referrer not like '/%'`);
+          params.push(`%://${filter}/%`);
+        }
+        break;
+
+      case 'query':
+        if (table === 'pageview') {
+          arr.push(`and ${table}.url like '%?%'`);
+        }
+    }
+
+    return arr;
+  }, []);
+
+  return query.join('\n');
+}
+
+function parseFilters(table, column, filters = {}, params = [], sessionKey = 'session_id') {
+  const { domain, url, event_url, referrer, os, browser, device, country, event_name, query } =
+    filters;
+
+  const pageviewFilters = { domain, url, referrer, query };
+  const sessionFilters = { os, browser, device, country };
+  const eventFilters = { url: event_url, event_name };
+
+  return {
+    pageviewFilters,
+    sessionFilters,
+    eventFilters,
+    event: { event_name },
+    joinSession:
+      os || browser || device || country
+        ? `inner join session on ${table}.${sessionKey} = session.${sessionKey}`
+        : '',
+    pageviewQuery: getFilterQuery('pageview', column, pageviewFilters, params),
+    sessionQuery: getFilterQuery('session', column, sessionFilters, params),
+    eventQuery: getFilterQuery('event', column, eventFilters, params),
+  };
+}
+
+async function rawQuery(query, params = []) {
+  const db = getDatabaseType(process.env.DATABASE_URL);
+
+  if (db !== POSTGRESQL && db !== MYSQL) {
+    return Promise.reject(new Error('Unknown database.'));
+  }
+
+  const sql = db === MYSQL ? query.replace(/\$[0-9]+/g, '?') : query;
+
+  return prisma.$queryRawUnsafe.apply(prisma, [sql, ...params]);
+}
+
+async function multiQuery(queries) {
+  return prisma.$transaction(queries);
+}
+
+// Initialization
+const prisma = global[PRISMA] || getClient(PRISMA_OPTIONS);
+
+export default {
+  client: prisma,
+  log,
+  getDateQuery,
+  getTimestampInterval,
+  getFilterQuery,
+  parseFilters,
+  rawQuery,
+  multiQuery,
+};