Český ráj (ceskyraj.com) scraper

1import { URL } from "url";
2import { Actor } from "apify3";
3import { CheerioCrawler, createCheerioRouter } from "crawlee";
4import { init, save, toNumberOrNull } from "./_utils/common.js";
5
6var LABEL;
7
8(function (LABEL) {
9  LABEL["INDEX"] = "INDEX";
10  LABEL["PRODUCTS"] = "PRODUCTS";
11})(LABEL || (LABEL = {}));
12var MODE;
13
14(function (MODE) {
15  MODE["TEST"] = "TEST";
16  MODE["FULL"] = "FULL";
17})(MODE || (MODE = {}));
18
19async function enqueueInitial(type, crawler) {
20  if (type === MODE.FULL) {
21    await crawler.addRequests([
22      {
23        userData: { label: LABEL.INDEX },
24        url: `https://www.ceskyraj.com/nase-znacky/`,
25      },
26    ]);
27  } else if (type === MODE.TEST) {
28    const requests = [
29      {
30        userData: { label: LABEL.PRODUCTS },
31        url: `https://www.ceskyraj.com/hydrapak/`,
32      },
33      {
34        userData: { label: LABEL.PRODUCTS },
35        url: `https://www.ceskyraj.com/crankbrothers/`,
36      },
37      {
38        userData: { label: LABEL.PRODUCTS },
39        url: `https://www.ceskyraj.com/camelbak/`,
40      },
41    ];
42    await crawler.addRequests(requests);
43  }
44}
45
46const router = createCheerioRouter();
47
48router.addHandler(LABEL.INDEX, async ({ crawler, $ }) => {
49  const requests = [];
50  $(`#SubCategories ul.root li.leaf a.name`).each((i, el) => {
51    const url = $(el).attr(`href`);
52    const name = $(el).text();
53    requests.push({
54      url: `https://www.ceskyraj.com` + url,
55      userData: { label: LABEL.PRODUCTS, category: name },
56    });
57  });
58  await crawler.addRequests(requests);
59});
60
61router.addHandler(LABEL.PRODUCTS, async ({ crawler, $, request }) => {
62  console.log(`handleProducts`, request.url);
63  const PER_PAGE = 24;
64  if (!request.url.includes(`?f=`)) {
65    // on first page
66    const hasMore = !!$(`#CompoundPagingBottom a.nextProducts`).length;
67    const totalRaw = $(`#CompoundPagingBottom .displayedProducts`).text(); // e.g. `Zobrazeno 1-24 ze 52 produktů`
68    const total = parseInt(totalRaw.match(/ze (\d+) produktů/)[1]); // e.g. 52
69    let offset = PER_PAGE; // eg. 24, 48, 72, ...
70    while (offset < total) {
71      console.log(
72        `handleProducts`,
73        request.url,
74        `offset`,
75        offset,
76        `...enqueuing`
77      );
78      const paginatedUrl = new URL(request.url);
79      paginatedUrl.searchParams.set(`f`, offset.toString());
80      void crawler.addRequests([
81        {
82          userData: { label: LABEL.PRODUCTS },
83          url: paginatedUrl.toString(),
84        },
85      ]);
86      offset += PER_PAGE;
87    }
88  }
89
90  const products = [];
91  $(`#ProductsHost .ProductView`).each((i, el) => {
92    const id = $(el).attr(`id`);
93    const url = $(el).find(`h2 a`).attr(`href`);
94    const fullUrl = `https://www.ceskyraj.com` + url;
95    const title = $(el).find(`h2`).text();
96    const priceRaw = $(el).find(`.price.user`).text(); // `640&nbsp;Kč`
97    const price = priceRaw.replace(/\D/g, ``);
98    const priceOrigRaw = $(el).find(`.price.retail`).text(); // `640&nbsp;Kč`
99    const priceOrig = priceOrigRaw.replace(/\D/g, ``);
100    const img = $(el).find(`.crImages img.thumbnail`).attr(`data-src`);
101    const inStock = $(el).find(`.AvailabilityView`).text().includes(`skladem`);
102
103    const product = {
104      pid: id,
105      name: title,
106      url: fullUrl,
107      img: img,
108      inStock,
109      currentPrice: toNumberOrNull(price),
110      originalPrice: toNumberOrNull(priceOrig),
111      currency: `CZK`,
112    };
113    products.push(product);
114  });
115  await save(products);
116});
117
118void Actor.main(async () => {
119  const input = await Actor.getInput();
120  const { mode = MODE.FULL, ...rest } = input ?? {};
121  await init({ actorNameOverride: `ceskyraj-com` }, rest);
122  const crawler = new CheerioCrawler({ requestHandler: router });
123  await enqueueInitial(mode, crawler);
124  await crawler.run();
125});

1import { createHash } from 'crypto'
2import os from "os"
3import path from "path"
4// eslint-disable-next-line @apify/apify-actor/no-forbidden-node-internals
5import fs from "fs"
6import pg from "pg"
7import pgConnectionString from 'pg-connection-string'
8import { config } from 'dotenv'
9import findConfig from "find-config"
10import { Client as ElasticClient } from "@elastic/elasticsearch"
11import filenamify from 'filenamify'
12import { Dataset } from 'crawlee'
13
14config({ path: findConfig(`.env`) })
15
16const elasticIndexName = `actors-monorepo-shops`
17
18const globalLogsProps = {
19  __NODE_STARTED: new Date().toISOString(),
20}
21
22let actorName
23let pgClient
24let pgClientNormalized
25let elasticClient
26export async function init ({ actorNameOverride }, restInput) {
27  parseEnvFromInput(restInput)
28
29  if (os.platform() === `darwin`) {
30    const filePath = process.argv[1] // ~/Projects/apify-actors-monorepo/actors/foo.ts
31    const basename = path.basename(filePath) // foo.ts
32    actorName = actorNameOverride ?? basename.split(`.`)[0] // foo
33    const gitBranch = fs.readFileSync(path.join(process.cwd(), `..`, `.git/HEAD`), `utf8`)
34      .split(` `)[1]
35      .trim()
36      .replace(`refs/heads/`, ``)
37    const gitCommit = fs.readFileSync(path.join(process.cwd(), `..`, `.git/refs/heads/${gitBranch}`), `utf8`)
38    const gitCommitShort = gitCommit.substring(0, 7)
39    globalLogsProps.__GIT_COMMIT = gitCommitShort
40  }
41
42  if (process.env.APIFY_IS_AT_HOME) {
43    actorName = actorNameOverride ?? process.env.APIFY_ACTOR_ID // Name would be better, but it's not in ENV
44  }
45
46  /* ELASTIC */
47  /* ======= */
48  if (process.env.ELASTIC_CLOUD_ID) {
49    elasticClient = new ElasticClient({
50      cloud: { id: process.env.ELASTIC_CLOUD_ID },
51      auth: { apiKey: process.env.ELASTIC_CLOUD_API_KEY },
52    })
53
54    // const mapping = await elasticClient.indices.getMapping({ index: actorName })
55
56    // eslint-disable-next-line no-inner-declarations
57    async function enforceIndexMapping () {
58      const doesIndexExist = await elasticClient.indices.exists({ index: elasticIndexName })
59      if (!doesIndexExist) await elasticClient.indices.create({ index: elasticIndexName })
60      await elasticClient.indices.putMapping({
61        index: elasticIndexName,
62        body: {
63          properties: {
64            _discount: { type: `float` },
65            originalPrice: { type: `float` },
66            currentPrice: { type: `float` },
67          },
68        },
69      })
70    }
71
72    try {
73      await enforceIndexMapping()
74    } catch (err) {
75      if (err.message.includes(`cannot be changed from type`)) {
76        console.log(`Elastic index ${elasticIndexName} already exists with incorrect mappings. As existing mapping cannot be changed, index will be deleted and recreated.`)
77        await elasticClient.indices.delete({ index: elasticIndexName })
78        await enforceIndexMapping()
79      }
80    }
81  }
82
83  /* POSTGRESQL */
84  /* ========== */
85  if (process.env.PG_CONNECTION_STRING) {
86    const pgConfig = pgConnectionString(process.env.PG_CONNECTION_STRING)
87    // const pgPool = new pg.Pool(pgConfig)
88
89    pgClient = new pg.Client(pgConfig)
90    await pgClient.connect()
91
92    // Check if table exists and have proper columns
93    const { rows: tables } = await pgClient.query(`
94    SELECT table_name
95    FROM information_schema.tables
96    WHERE table_schema = 'public'
97  `)
98
99    // eslint-disable-next-line camelcase
100    const tableExists = tables.some(({ table_name }) => table_name === process.env.PG_DATA_TABLE)
101    if (!tableExists) {
102      throw new Error(`Table ${process.env.PG_DATA_TABLE} does not exist in database ${pgConfig.database}`)
103    }
104
105  // TODO: Handle pgClient closing
106  }
107
108  if (process.env.PG_CONNECTION_STRING_NORMALIZED) {
109    const pgConfig = pgConnectionString(process.env.PG_CONNECTION_STRING_NORMALIZED)
110
111    pgClientNormalized = new pg.Client(pgConfig)
112    await pgClientNormalized.connect()
113
114    // Check if table exists and have proper columns
115    const { rows: tables } = await pgClientNormalized.query(`
116    SELECT table_name
117    FROM information_schema.tables
118    WHERE table_schema = 'public'
119  `)
120
121    // eslint-disable-next-line camelcase
122    const tableMainExists = tables.some(({ table_name }) => table_name === process.env.PG_DATA_TABLE)
123    // eslint-disable-next-line camelcase
124    const tablePricesExists = tables.some(({ table_name }) => table_name === process.env.PG_DATA_PRICE_TABLE)
125    if (!tableMainExists) throw new Error(`Table ${process.env.PG_DATA_TABLE} does not exist in database ${pgConfig.database}`)
126    if (!tablePricesExists) throw new Error(`Table ${process.env.PG_DATA_PRICE_TABLE} does not exist in database ${pgConfig.database}`)
127
128  // TODO: Handle pgClient closing
129  }
130}
131
132// inspired by @drobnikj
133// TODO: Similar, but less obfuscated for easier debugging
134export const createUniqueKeyFromUrl = (url) => {
135  const hash = createHash(`sha256`)
136  const cleanUrl = url.split(`://`)[1] // Remove protocol
137  hash.update(cleanUrl)
138  return hash.digest(`hex`)
139}
140
141/**
142 *
143 * @param {Date} datetime
144 * @return {Promise<void>}
145 */
146export const sleepUntil = async (datetime) => {
147  const now = new Date()
148  const difference = datetime - now
149  if (difference > 0) {
150    return new Promise((resolve) => {
151      setTimeout(resolve, difference)
152    })
153  }
154  return Promise.resolve()
155}
156
157export function parsePrice (string) {
158  let amount, currency
159  const noText = string.replace(/[^\d,.]/g, ``)
160  const decimals = noText.match(/([,.])(\d{2})$/)
161  if (decimals) {
162    const decimalSeparator = decimals[1]
163    // eslint-disable-next-line @typescript-eslint/no-unused-vars, no-unused-vars
164    const decimalAmount = decimals[2]
165    amount = parseInt(noText.split(decimalSeparator)[0])
166  } {
167    const justNumbers = noText.replace(/[,.]/g, ``)
168    amount = parseInt(justNumbers)
169  }
170  return { amount, currency }
171}
172
173export function toNumberOrNull (str) {
174  // TODO: Handle better, but only after adding test
175  if (str === undefined) return null
176  if (str === null) return null
177  if (str === ``) return null
178  const num = Number(str)
179  if (Number.isNaN(num)) return null
180  return num
181}
182
183export async function save (objs) {
184  if (!Array.isArray(objs)) objs = [objs]
185  if (objs.length === 0) return
186
187  const objsExtended = objs.map((obj) => {
188    const objExtended = {
189      ...obj,
190      actorName,
191      ...globalLogsProps,
192      // __NODE_VERSION: global.process.versions.node,
193      // __NODE_UPTIME: global.process.uptime().toFixed(2), // seconds, 2 decimals
194    }
195    // if run on Apify
196    if (process.env.APIFY_IS_AT_HOME) {
197      objExtended.__APIFY_ACTOR_ID = process.env.APIFY_ACTOR_ID
198      objExtended.__APIFY_ACTOR_RUN_ID = process.env.APIFY_ACTOR_RUN_ID
199      objExtended.__APIFY_ACTOR_BUILD_ID = process.env.APIFY_ACTOR_BUILD_ID
200      objExtended.__APIFY_ACTOR_BUILD_NUMBER = process.env.APIFY_ACTOR_BUILD_NUMBER
201      objExtended.__APIFY_ACTOR_TASK_ID = process.env.APIFY_ACTOR_TASK_ID
202      if (!process.env.APIFY_DONT_STORE_IN_DATASET) void Dataset.pushData(obj)
203    }
204    return objExtended
205  })
206  // if runs on local machine (MacOS)
207  if (os.platform() === `darwin`) {
208    const cwd = process.cwd() // ~/Projects/apify-actors-monorepo/actors
209    const storageDir = path.join(cwd, `${actorName}.storage`) // ~/Projects/apify-actors-monorepo/actors/foo.storage
210    if (!fs.existsSync(storageDir)) fs.mkdirSync(storageDir)
211    const dataDir = path.join(storageDir, `data`) // ~/Projects/apify-actors-monorepo/actors/foo.storage/data
212    if (!fs.existsSync(dataDir)) fs.mkdirSync(dataDir)
213    for (const objExtended of objsExtended) {
214      const id = objExtended.id ?? objExtended.pid // ?? uuidv4()
215      const fileName = `${filenamify(id)}.json`
216      const dataFilePath = path.join(dataDir, fileName) // ~/Projects/apify-actors-monorepo/actors/foo.storage/data/foo.json
217      fs.writeFileSync(dataFilePath, JSON.stringify(objExtended, null, 2))
218    }
219  }
220
221  if (pgClient) {
222    const objsPg = objs.map((obj) => ({
223      ...obj,
224      // TODO: This is becoming not nice, and not clear
225      shop: actorName,
226      scrapedAt: new Date().toISOString().split(`T`)[0],
227    }))
228
229    const columns = getColumns(objsPg)
230    const values = getValues(objsPg)
231    const queryString = `
232        INSERT INTO public."${process.env.PG_DATA_TABLE}" (${columns})
233        VALUES (${values})
234    `
235    try {
236      const { rowCount } = await pgClient.query(queryString)
237      console.log(`[save] saved to database: ${JSON.stringify(rowCount)}`)
238    } catch (err) {
239      if (err.message.includes(`violates unique constraint`)) console.warn(`PostgresSQL: violates unique constraint`)
240      else throw err
241    }
242  }
243
244  // Only make sense for HlidacShopu
245  if (pgClientNormalized) {
246    const objsPgData = objs.map((obj) => ({
247      shop: actorName,
248      pid: obj.pid,
249      name: obj.name,
250      url: obj.url,
251      img: obj.img,
252    }))
253
254    const objsPgDataPrice = objs.map((obj) => ({
255      shop: actorName,
256      pid: obj.pid,
257      scrapedAt: new Date().toISOString().split(`T`)[0],
258      currentPrice: obj.currentPrice,
259      originalPrice: obj.originalPrice,
260      inStock: obj.inStock,
261    }))
262
263    const queryString = `
264        INSERT INTO public."${process.env.PG_DATA_TABLE}" (${getColumns(objsPgData)})
265        VALUES (${getValues(objsPgData)})
266        ON CONFLICT DO NOTHING
267    `
268    try {
269      const { rowCount } = await pgClientNormalized.query(queryString)
270      console.log(`[save] saved to database (data): ${JSON.stringify(rowCount)}`)
271    } catch (err) {
272      if (err.message.includes(`violates unique constraint`)) console.warn(`PostgresSQL: violates unique constraint`)
273      else throw err
274    }
275
276    const queryStringPrice = `
277        INSERT INTO public."${process.env.PG_DATA_PRICE_TABLE}" (${getColumns(objsPgDataPrice)})
278        VALUES (${getValues(objsPgDataPrice)})
279        ON CONFLICT DO NOTHING
280    `
281    try {
282      const { rowCount } = await pgClientNormalized.query(queryStringPrice)
283      console.log(`[save] saved to database (price): ${JSON.stringify(rowCount)}`)
284    } catch (err) {
285      if (err.message.includes(`violates unique constraint`)) console.warn(`PostgresSQL: violates unique constraint`)
286      else throw err
287    }
288  }
289
290  if (elasticClient) {
291    // .index creates or updates the document
292    // .create creates a new document if it doesn't exist, 409 if it does
293    // try {
294    //   const res = await elasticClient.index({
295    //     index: `actors-monorepo-shops`, // TODO: Consider using actorName
296    //     id, // foo-bar
297    //     document: objExtended, // {...}
298    //   })
299    // } catch (err) {
300    //   // https://discuss.elastic.co/t/elasticsearch-503-ok-false-message-the-requested-deployment-is-currently-unavailable/200583
301    //   if (err.message.includes(`requested resource is currently unavailable`)) console.log(`Elasticsearch is unavailable, skipping, but not aborting`)
302    //   else throw err
303    // }
304  }
305}
306
307function getColumns (objs) {
308  return Object.keys(objs[0]).map((key) => `"${key}"`).join(`, `)
309}
310
311function getValues (objs) {
312  return objs.map(objPg => Object.values(objPg).map((value) => {
313    // escape strings to prevent SQL injection
314    if (typeof value === `string`) return `'${value.replace(/'/g, `''`)}'`
315    // convert to DB specific null
316    if (typeof value === `undefined` || value === null) return `NULL`
317    return value
318  }).join(`, `)).join(`), (`)
319}
320
321export function parseEnvFromInput (input) {
322  const env = {}
323  for (const key in input) {
324    if (key === key.toUpperCase()) env[key] = input[key]
325  }
326  console.log(`[parseEnvFromInput] ${JSON.stringify(env)}`)
327  Object.assign(process.env, env)
328}