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routes.js
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340 lines (284 loc) · 9.61 KB
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'use strict'
const apm = require('elastic-apm-node')
const express = require('express')
const afterAll = require('after-all-results')
const db = require('./db')
const redis = require('./redis')
const accounting = require('./accounting')
const app = module.exports = new express.Router()
app.get('/stats', function (req, res) {
const next = afterAll(function (err, results) {
if (err) return error(err, res)
res.json({
products: results[0].rows[0].count,
customers: results[1].rows[0].count,
orders: results[2].rows[0].count,
numbers: results[3]
})
})
db.pool.query('SELECT COUNT(*) FROM products', next())
db.pool.query('SELECT COUNT(*) FROM customers', next())
db.pool.query('SELECT COUNT(*) FROM orders', next())
const done = next()
const sql = 'SELECT product_id, COUNT(product_id) AS amount ' +
'FROM order_lines ' +
'GROUP BY product_id'
db.pool.query(sql, function (err, result) {
if (err) return done(err)
const orderedProducts = result.rows
const next = afterAll(function (err, results) {
if (err) return done(err)
const result = { revenue: 0, cost: 0, profit: 0 }
results.forEach(function (r, index) {
const product = r.rows[0]
const amount = orderedProducts[index].amount
const cost = product.cost * amount
const revenue = product.selling_price * amount
result.revenue += revenue
result.cost += cost
result.profit += revenue - cost
})
done(null, result)
})
orderedProducts.forEach(function (row) {
const sql = 'SELECT cost, selling_price FROM products WHERE id=$1'
db.pool.query(sql, [row.product_id], next())
})
})
})
app.get('/products', function (req, res) {
redis.get('products', function (err, obj) {
if (err) apm.captureError(err)
else if (obj) return res.json(obj)
const sql = 'SELECT p.id, p.sku, p.name, p.stock, t.name AS type_name FROM products p ' +
'LEFT JOIN product_types t ON p.type_id=t.id'
db.pool.query(sql, function (err, result) {
if (err) return error(err, res)
res.json(result.rows)
})
})
})
app.get('/products/top', function (req, res) {
const sql = 'SELECT product_id, COUNT(product_id) AS amount ' +
'FROM order_lines ' +
'GROUP BY product_id ' +
'LIMIT 3'
db.pool.query(sql, function (err, result) {
if (err) return error(err, res)
const next = afterAll(function (err, results) {
if (err) return error(err, res)
const top = result.rows.map(function (row, index) {
const product = results[index].rows[0]
product.sold = row.amount
return product
})
res.json(top)
})
result.rows.forEach(function (row) {
const sql = 'SELECT id, sku, name, stock FROM products WHERE id=$1'
db.pool.query(sql, [row.product_id], next())
})
})
})
app.get('/products/:id', function (req, res) {
const sql = 'SELECT p.*, t.name AS type_name FROM products p ' +
'LEFT JOIN product_types t ON p.type_id=t.id ' +
'WHERE p.id=$1'
db.pool.query(sql, [req.params.id], function (err, result) {
if (err) return error(err, res)
if (result.rowCount === 0) return res.status(404).end()
res.json(result.rows[0])
})
})
app.get('/products/:id/customers', function (req, res) {
const limit = req.query.limit || 1000
const sql = 'SELECT c.* FROM customers c ' +
'LEFT JOIN orders o ON c.id=o.customer_id ' +
'LEFT JOIN order_lines l ON o.id=l.order_id ' +
'LEFT JOIN products p ON l.product_id=p.id ' +
'WHERE p.id=$1 ' +
'LIMIT $2'
db.pool.query(sql, [req.params.id, limit], function (err, result) {
if (err) return error(err, res)
if (!req.query.count) return res.json(result.rows)
const next = afterAll(function (err, results) {
if (err) return error(err, res)
result.rows.forEach(function (row, index) {
row.orderCount = results[index].rows.length
})
res.json(result.rows)
})
result.rows.forEach(function (row) {
const sql = 'SELECT * FROM orders WHERE customer_id=$1'
db.pool.query(sql, [row.id], next())
})
})
})
app.get('/types', function (req, res) {
redis.get('types', function (err, obj) {
if (err) apm.captureError(err)
else if (obj) return res.json(obj)
db.pool.query('SELECT * FROM product_types', function (err, result) {
if (err) return error(err, res)
res.json(result.rows)
})
})
})
app.get('/types/:id', function (req, res) {
db.pool.query('SELECT * FROM product_types WHERE id=$1', [req.params.id], function (err, result) {
if (err) return error(err, res)
const type = result.rows[0]
if (!type) return res.status(404).end()
db.pool.query('SELECT id, name FROM products WHERE type_id=$1', [req.params.id], function (err, result) {
if (err) return error(err, res)
type.products = result.rows
res.json(type)
})
})
})
app.get('/customers', function (req, res) {
redis.get('customers', function (err, obj) {
if (err) apm.captureError(err)
else if (obj) return res.json(obj)
const limit = req.query.limit || 1000
const sql = 'SELECT * FROM customers LIMIT $1'
db.pool.query(sql, [limit], function (err, result) {
if (err) return error(err, res)
res.json(result.rows)
})
})
})
app.post('/customers', function (req, res) {
const customer = req.body
const isEmail = /^([a-zA-Z0-9])(([-.]|[_]+)?([a-zA-Z0-9]+))*(@){1}[a-z0-9]+[.]{1}(([a-z]{2,3})|([a-z]{2,3}[.]{1}[a-z]{2,3}))$/
if (!customer.full_name || !customer.company_name || !isEmail.test(customer.email)) {
res.status(400).end()
return
}
const sql = 'INSERT INTO customers (full_name, company_name, email, address, postal_code, city, country) VALUES ($1, $2, $3, $4, $5, $6, $7)'
const values = [
customer.full_name,
customer.company_name,
customer.email,
customer.address,
customer.postal_code,
customer.city,
customer.country
]
db.pool.query(sql, values, function (err) {
if (err) return error(err, res)
res.end()
})
})
app.get('/customers/:id', function (req, res) {
db.pool.query('SELECT * FROM customers WHERE id=$1', [req.params.id], function (err, result) {
if (err) return error(err, res)
if (result.rowCount === 0) return res.status(404).end()
res.json(result.rows[0])
})
})
app.get('/orders', function (req, res) {
redis.get('orders', function (err, obj) {
if (err) apm.captureError(err)
else if (obj) return res.json(obj)
const limit = req.query.limit || 1000
const sql = 'SELECT o.*, c.full_name AS customer_name FROM orders o ' +
'LEFT JOIN customers c ON c.id=o.customer_id ' +
'LIMIT $1'
db.pool.query(sql, [limit], function (err, result) {
if (err) return error(err, res)
res.json(result.rows)
})
})
})
/**
* Example body:
* {
* customer_id: 1,
* lines: [
* {id: 1, amount: 1}
* ]
* }
*/
app.post('/orders', function (req, res) {
if (!req.body.customer_id || !req.body.lines) {
res.status(400).end()
return
}
db.client(function (err, client, done) {
if (err) return error(err, res)
const next = afterAll(function (err, results) {
if (err) {
done()
error(err, res)
return
}
if (results.some(function (result) { return result.rowCount === 0 })) {
done()
res.status(400).end()
return
}
client.query('BEGIN', function (err) {
if (err) return rollback(err)
const sql = 'INSERT INTO orders (customer_id) VALUES ($1) RETURNING id'
client.query(sql, [req.body.customer_id], function (err, result) {
if (err) return rollback(err)
const id = result.rows[0].id
const next = afterAll(function (err) {
if (err) return rollback(err)
accounting.placeOrder({ id: id }, function (err) {
if (err) return rollback(err)
client.query('COMMIT', function (err) {
if (err) return rollback(err)
done()
redis.set('newest-order', id, function (err) {
if (err) return error(err, res)
res.json({ id: id })
})
})
})
})
req.body.lines.forEach(function (line) {
const sql = 'INSERT INTO order_lines (order_id, product_id, amount) ' +
'VALUES ($1, $2, $3)'
client.query(sql, [id, line.id, line.amount], next())
})
})
function rollback (err) {
apm.captureError(err)
client.query('ROLLBACK', function (err) {
if (err) apm.captureError(err)
done(err)
res.status(500).end()
})
}
})
})
client.query('SELECT id FROM customers WHERE id=$1', [req.body.customer_id], next())
req.body.lines.forEach(function (line) {
client.query('SELECT id FROM products WHERE id=$1', [line.id], next())
})
})
})
app.get('/orders/:id', function (req, res) {
db.pool.query('SELECT * FROM orders WHERE id=$1', [req.params.id], function (err, result) {
if (err) return error(err, res)
const order = result.rows[0]
if (!order) return res.status(404).end()
const sql = 'SELECT l.amount, p.* FROM order_lines l ' +
'LEFT JOIN products p ON l.product_id=p.id ' +
'WHERE l.order_id=$1'
db.pool.query(sql, [req.params.id], function (err, result) {
if (err) return error(err, res)
order.lines = result.rows
apm.setCustomContext({
orderLines: result.rows.length
})
res.json(order)
})
})
})
function error (err, res) {
apm.captureError(err)
res.status(500).end()
}