hak8or/greasemonkey_scripts
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

More CLI support

Browse Source
This commit is contained in:
hak8or
2025-05-28 00:34:55 -04:00
parent 411e21ca7a
commit 9a9b1a5b9e
6 changed files with 303 additions and 86 deletions
Download Patch File Download Diff File Expand all files Collapse all files

266
ebay_command_line_tool.js
View File

@ -1,91 +1,251 @@
// ebay_command_line_tool.js
// A Node.js script to scrape eBay search results and output JSON.
// Uses ebay_core.js for parsing and extraction logic.
// Usage: node ebay_command_line_tool.js "EBAY_SEARCH_URL"
// ebay_command_line_tool.js V3
// Node.js script with commands to scrape eBay and output JSON.
// Enhanced with network blocking for --load, --only_json flag, and improved help.
// Usage: node ebay_command_line_tool.js [command] [options] [url]
const puppeteer = require('puppeteer');
const fs = require('fs');
const path = require('path');
const { Command } = require('commander');
// --- Main Scraping Function ---
async function scrapeEbayFromCommandLine(url) {
if (!url) {
console.error("Error: eBay search URL is required as the first argument.");
console.log("Example Usage: node ebay_command_line_tool.js \"https://www.ebay.com/sch/i.html?_nkw=ssd\"");
process.exit(1);
// --- Load Core Script ---
const coreScriptPath = path.join(__dirname, 'ebay_core.js'); // Assumes ebay_core.js is in the same directory
let ebayCoreScriptContent;
try {
ebayCoreScriptContent = fs.readFileSync(coreScriptPath, 'utf8');
if (!ebayCoreScriptContent) {
throw new Error("ebay_core.js is empty or could not be read properly.");
}
} catch (e) {
// This initial error should always print, regardless of --only_json
console.error(`Critical Error: Could not read ebay_core.js from ${coreScriptPath}`);
console.error("Please ensure 'ebay_core.js' exists in the same directory as this script.");
console.error(e.message);
process.exit(1);
}
// --- Load Core Script ---
// This assumes ebay_core.js is in the same directory as this script.
const coreScriptPath = path.join(__dirname, 'ebay_core.js');
let ebayCoreScriptContent;
try {
ebayCoreScriptContent = fs.readFileSync(coreScriptPath, 'utf8');
if (!ebayCoreScriptContent) {
throw new Error("ebay_core.js is empty or could not be read properly.");
}
} catch (e) {
console.error(`Error: Could not read ebay_core.js from ${coreScriptPath}`);
console.error("Please ensure 'ebay_core.js' exists in the same directory as this script.");
console.error(e.message);
process.exit(1);
// --- Global State for --only_json ---
let quietMode = false;
// --- Logger functions that respect quietMode ---
function logMessage(message) {
if (!quietMode) {
console.log(message);
}
}
function logError(message) {
if (!quietMode) {
console.error(message);
}
}
console.log(`Attempting to scrape: ${url}`);
let browser; // Declare browser outside try so it can be closed in finally
// --- Main Scraping Function (Updated) ---
async function scrapeEbay({ url = null, htmlFile = null, saveFile = null }) {
logMessage("Starting scraping process...");
let browser;
try {
browser = await puppeteer.launch({
headless: true, // Set to false for debugging to see the browser
args: ['--no-sandbox', '--disable-setuid-sandbox'] // Common args for server environments
headless: true,
args: ['--no-sandbox', '--disable-setuid-sandbox']
});
const page = await browser.newPage();
await page.setUserAgent('Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36');
// Increase navigation timeout and wait until network is idle
await page.goto(url, { waitUntil: 'networkidle2', timeout: 90000 });
let htmlContentToParse;
if (htmlFile) {
// --- Load from File with Network Blocking ---
logMessage(`Loading HTML from ${htmlFile}...`);
htmlContentToParse = fs.readFileSync(htmlFile, 'utf8');
logMessage("Enabling request interception to block network calls...");
await page.setRequestInterception(true);
page.on('request', (request) => {
// Abort all types of requests
logMessage(`Blocking request to: ${request.url()}`);
request.abort();
});
await page.setContent(htmlContentToParse, { waitUntil: 'domcontentloaded' });
logMessage("HTML loaded and set. Network requests are being blocked.");
} else if (url) {
// --- Fetch from URL ---
logMessage(`Navigating to ${url}...`);
await page.goto(url, { waitUntil: 'networkidle2', timeout: 90000 });
logMessage("Navigation successful.");
htmlContentToParse = await page.content();
logMessage("Page content retrieved.");
// --- Save to File (if requested) ---
if (saveFile && htmlContentToParse) {
logMessage(`Saving HTML to ${saveFile}...`);
fs.writeFileSync(saveFile, htmlContentToParse, 'utf8');
logMessage("HTML saved.");
}
} else {
// This error should be caught and handled by the caller or a try-catch within runScraping
throw new Error("Internal Error: Neither URL nor HTML file was provided to scrapeEbay.");
}
// --- Inject and Execute Core Logic ---
// Inject the core parser script into the page context
// This makes the EbayParser object available in the page's window scope
logMessage("Injecting core parser script...");
await page.evaluate(ebayCoreScriptContent);
logMessage("Core script injected. Extracting data...");
// Now call the extraction function from the injected script
const extractedResults = await page.evaluate(() => {
// EbayParser should now be available on the window object
if (typeof window.EbayParser === 'undefined' || typeof window.EbayParser.extractDataFromPage !== 'function') {
// This error will be caught by the outer try/catch if thrown
throw new Error("EbayParser or EbayParser.extractDataFromPage function was not properly injected or is missing in ebay_core.js!");
}
return window.EbayParser.extractDataFromPage(); // This calls the function defined in ebay_core.js
return window.EbayParser.extractDataFromPage();
});
logMessage(`Data extraction complete. Found ${extractedResults.length} items.`);
return extractedResults;
} catch (e) {
console.error("An error occurred during the scraping process:", e.message);
// If running in a visible mode, a screenshot can be helpful.
// if (browser && page) { // Check if page exists
// try {
// await page.screenshot({ path: 'ebay_scraping_error.png' });
// console.log("A screenshot 'ebay_scraping_error.png' has been saved for debugging.");
// } catch(se) { console.error("Could not save screenshot:", se.message); }
// }
logError(`An error occurred during the scraping process: ${e.message}`);
// For debugging, you might want to see the stack trace even in quiet mode for critical errors
if (!quietMode && e.stack) {
console.error(e.stack);
}
return []; // Return empty array on error
} finally {
if (browser) {
await browser.close();
logMessage("Browser closed.");
}
}
}
// --- Script Execution ---
// The first actual argument to the script (process.argv[0] is node, process.argv[1] is the script path)
const searchUrl = process.argv[2];
// --- Setup Command Line Interface ---
const program = new Command();
program
.name('ebay-scraper')
.description('Scrapes eBay search results for SSD/HDD cost per TB.')
.version('3.0.0')
.option('--save <filename>', 'Save the scraped HTML to a file.')
.option('--load <filename>', 'Load HTML from a file instead of fetching from eBay (disables network).')
.option('--only_json', 'Suppress all informational logs and output only the final JSON.', false)
.on('option:only_json', () => {
quietMode = true;
});
program
.command('latest') // Removed { isDefault: false } as it's not strictly needed with argument handling
.description('Scrapes the latest listings using a predefined search. Use "ebay-scraper latest --help" to see specific options for this command.')
.option('--per_page <number>', 'Items per page (60, 120, or 240)', '60')
.option('--minimum_cost <number>', 'Minimum cost for listings (e.g., 50.00)', '0.00')
.action(async (cmdOptions) => { // cmdOptions refers to 'latest' command's options
const globalOptions = program.opts(); // Access global options like --save, --load, --only_json
if (globalOptions.only_json) quietMode = true; // Ensure quietMode is set if command is run directly
if (globalOptions.load) {
logMessage("Using --load, 'latest' command options for URL generation will be ignored.");
await runScraping({ htmlFile: globalOptions.load, saveFile: globalOptions.save });
} else {
const validPages = ['60', '120', '240'];
if (!validPages.includes(cmdOptions.per_page)) {
logError(`Error: --per_page must be one of ${validPages.join(', ')}.`);
if (!quietMode) process.exit(1); else throw new Error("Invalid per_page");
}
const minCost = parseFloat(cmdOptions.minimum_cost);
if (isNaN(minCost)) {
logError("Error: --minimum_cost must be a number.");
if (!quietMode) process.exit(1); else throw new Error("Invalid minimum_cost");
}
const baseUrl = 'https://www.ebay.com/sch/i.html?_nkw=&_sacat=175669&_from=R40&_fsrp=1&LH_PrefLoc=3&imm=1&_sop=10';
const url = `${baseUrl}&_ipg=${cmdOptions.per_page}&_udlo=${minCost.toFixed(2)}`;
logMessage(`Constructed URL for 'latest': ${url}`);
await runScraping({ url: url, saveFile: globalOptions.save });
}
});
// Handle URL as an argument. This will act as the default action if no other command is matched.
program
.argument('[url]', 'The full eBay search URL to scrape.')
.action(async (url, cmdOptions) => { // cmdOptions here are the global ones if no command specified
const globalOptions = program.opts();
if (globalOptions.only_json) quietMode = true;
// If 'url' is undefined here, it means no command and no URL was provided.
// 'latest' command has its own action, so this won't run for 'latest'.
if (globalOptions.load) {
logMessage("Using --load, any provided URL argument will be ignored.");
await runScraping({ htmlFile: globalOptions.load, saveFile: globalOptions.save });
} else if (url) {
await runScraping({ url: url, saveFile: globalOptions.save });
} else {
// If no URL, no --load, and not the 'latest' command, show help.
// This condition means no specific action was determined.
if (!program.args.find(arg => program.commands.map(c => c.name()).includes(arg))) {
program.help();
}
}
});
// Add help text to guide users for subcommand help
program.addHelpText('after', `
Example calls:
$ ebay-scraper latest --per_page 120 --minimum_cost 50
$ ebay-scraper latest --help
$ ebay-scraper "https://www.ebay.com/sch/i.html?_nkw=ssd"
$ ebay-scraper --load saved_page.html --only_json | jq .
$ ebay-scraper --save current_page.html "https://www.ebay.com/sch/i.html?_nkw=hdd"`);
// --- Wrapper to run scraping and print results ---
async function runScraping(options) {
try {
const data = await scrapeEbay(options);
if (quietMode) {
// Only output JSON string, no extra newlines or messages
process.stdout.write(JSON.stringify(data, null, 2));
} else {
if (data && data.length > 0) {
console.log(JSON.stringify(data, null, 2));
} else {
logMessage("No data extracted or a critical error occurred during scraping.");
}
}
} catch (e) {
logError(`Critical error in runScraping: ${e.message}`);
if (!quietMode && e.stack) console.error(e.stack);
if (quietMode) { // Ensure valid JSON output even on error for piping
process.stdout.write(JSON.stringify({error: e.message, data: []}));
}
}
}
// --- Parse Arguments and Run ---
(async () => {
const data = await scrapeEbayFromCommandLine(searchUrl);
if (data && data.length > 0) {
console.log(JSON.stringify(data, null, 2));
} else {
console.log("No data extracted. This could be due to an error, an empty page, or incorrect selectors in ebay_core.js.");
try {
await program.parseAsync(process.argv);
// If no command was matched by commander and no URL argument was given,
// and it's not just options like --version or --help that commander handles.
const knownCommands = program.commands.map(cmd => cmd.name());
const userArgs = process.argv.slice(2);
const potentialCommand = userArgs.find(arg => !arg.startsWith('-'));
if (userArgs.length > 0 && !knownCommands.includes(potentialCommand) && !program.args.includes(potentialCommand) && !program.opts().load && potentialCommand) {
// This case handles if a user types something that isn't a command or a URL after options.
// Example: `node script.js --only_json somegibberish`
// However, the default argument [url] should catch most of these.
// If a URL-like string is passed, it will be caught by the .argument('[url]') action.
} else if (process.argv.slice(2).length === 0) { // No arguments at all
program.help();
}
} catch (error) {
logError(`Command parsing error: ${error.message}`);
if (!quietMode && error.stack) console.error(error.stack);
if (quietMode) {
process.stdout.write(JSON.stringify({error: error.message, data: []}));
} else {
process.exit(1);
}
}
})();