Fetcher - Experimental fetcher improvements (Code TidyUp, Improve tests, revert to old playwright when using BrowserSteps for now) (#1564)
dgtlmoon
2 years ago
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GitHub
parent
690cf4acc9
commit
d939882dde
@ -0,0 +1,179 @@
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module.exports = async ({page, context}) => {
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var {
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url,
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execute_js,
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user_agent,
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extra_wait_ms,
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req_headers,
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include_filters,
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xpath_element_js,
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screenshot_quality,
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proxy_username,
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proxy_password,
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disk_cache_dir,
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no_cache_list,
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block_url_list,
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} = context;
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await page.setBypassCSP(true)
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await page.setExtraHTTPHeaders(req_headers);
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await page.setUserAgent(user_agent);
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// https://ourcodeworld.com/articles/read/1106/how-to-solve-puppeteer-timeouterror-navigation-timeout-of-30000-ms-exceeded
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await page.setDefaultNavigationTimeout(0);
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if (proxy_username) {
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await page.authenticate({
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username: proxy_username,
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password: proxy_password
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});
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}
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await page.setViewport({
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width: 1024,
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height: 768,
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deviceScaleFactor: 1,
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});
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await page.setRequestInterception(true);
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if (disk_cache_dir) {
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console.log(">>>>>>>>>>>>>>> LOCAL DISK CACHE ENABLED <<<<<<<<<<<<<<<<<<<<<");
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}
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const fs = require('fs');
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const crypto = require('crypto');
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function file_is_expired(file_path) {
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if (!fs.existsSync(file_path)) {
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return true;
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}
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var stats = fs.statSync(file_path);
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const now_date = new Date();
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const expire_seconds = 300;
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if ((now_date / 1000) - (stats.mtime.getTime() / 1000) > expire_seconds) {
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console.log("CACHE EXPIRED: " + file_path);
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return true;
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}
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return false;
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}
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page.on('request', async (request) => {
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// General blocking of requests that waste traffic
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if (block_url_list.some(substring => request.url().toLowerCase().includes(substring))) return request.abort();
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if (disk_cache_dir) {
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const url = request.url();
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const key = crypto.createHash('md5').update(url).digest("hex");
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const dir_path = disk_cache_dir + key.slice(0, 1) + '/' + key.slice(1, 2) + '/' + key.slice(2, 3) + '/';
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// https://stackoverflow.com/questions/4482686/check-synchronously-if-file-directory-exists-in-node-js
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if (fs.existsSync(dir_path + key)) {
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console.log("* CACHE HIT , using - " + dir_path + key + " - " + url);
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const cached_data = fs.readFileSync(dir_path + key);
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// @todo headers can come from dir_path+key+".meta" json file
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request.respond({
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status: 200,
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//contentType: 'text/html', //@todo
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body: cached_data
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});
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return;
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}
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}
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request.continue();
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});
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if (disk_cache_dir) {
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page.on('response', async (response) => {
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const url = response.url();
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// Basic filtering for sane responses
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if (response.request().method() != 'GET' || response.request().resourceType() == 'xhr' || response.request().resourceType() == 'document' || response.status() != 200) {
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console.log("Skipping (not useful) - Status:" + response.status() + " Method:" + response.request().method() + " ResourceType:" + response.request().resourceType() + " " + url);
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return;
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}
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if (no_cache_list.some(substring => url.toLowerCase().includes(substring))) {
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console.log("Skipping (no_cache_list) - " + url);
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return;
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}
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response.buffer().then(buffer => {
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if (buffer.length > 100) {
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console.log("Cache - Saving " + response.request().method() + " - " + url + " - " + response.request().resourceType());
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const key = crypto.createHash('md5').update(url).digest("hex");
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const dir_path = disk_cache_dir + key.slice(0, 1) + '/' + key.slice(1, 2) + '/' + key.slice(2, 3) + '/';
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if (!fs.existsSync(dir_path)) {
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fs.mkdirSync(dir_path, {recursive: true})
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}
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if (fs.existsSync(dir_path + key)) {
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if (file_is_expired(dir_path + key)) {
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fs.writeFileSync(dir_path + key, buffer);
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}
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} else {
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fs.writeFileSync(dir_path + key, buffer);
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}
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}
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});
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});
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}
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const r = await page.goto(url, {
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waitUntil: 'load'
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});
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await page.waitForTimeout(1000);
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await page.waitForTimeout(extra_wait_ms);
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if (execute_js) {
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await page.evaluate(execute_js);
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await page.waitForTimeout(200);
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}
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var xpath_data;
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var instock_data;
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try {
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// Not sure the best way here, in the future this should be a new package added to npm then run in browserless
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// (Once the old playwright is removed)
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xpath_data = await page.evaluate((include_filters) => {%xpath_scrape_code%}, include_filters);
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instock_data = await page.evaluate(() => {%instock_scrape_code%});
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} catch (e) {
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console.log(e);
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}
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// Protocol error (Page.captureScreenshot): Cannot take screenshot with 0 width can come from a proxy auth failure
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// Wrap it here (for now)
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var b64s = false;
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try {
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b64s = await page.screenshot({encoding: "base64", fullPage: true, quality: screenshot_quality, type: 'jpeg'});
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} catch (e) {
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console.log(e);
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}
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// May fail on very large pages with 'WARNING: tile memory limits exceeded, some content may not draw'
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if (!b64s) {
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// @todo after text extract, we can place some overlay text with red background to say 'croppped'
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console.error('ERROR: content-fetcher page was maybe too large for a screenshot, reverting to viewport only screenshot');
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try {
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b64s = await page.screenshot({encoding: "base64", quality: screenshot_quality, type: 'jpeg'});
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} catch (e) {
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console.log(e);
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}
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}
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var html = await page.content();
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return {
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data: {
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'content': html,
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'headers': r.headers(),
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'instock_data': instock_data,
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'screenshot': b64s,
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'status_code': r.status(),
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'xpath_data': xpath_data
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},
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type: 'application/json',
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};
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};
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