117 lines
4.1 KiB
Python
117 lines
4.1 KiB
Python
import argparse
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from itertools import product
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import time
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import yaml
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from prometheus_client import start_http_server, Gauge, Counter
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from webscraping_exporter.scrape_target import ScrapeTarget
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WEBSCRAPING_SCRAPE_TARGET_VALUE = Gauge(
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'webscraping_scrape_target_value',
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'The value scraped from a scrape target',
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['product_name', 'target_name'],
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)
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WEBSCRAPING_SCRAPE_TARGET_SUCCESS = Counter(
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'webscraping_scrape_target_success_total',
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'The number of successful scrape and parse of a scrape target',
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['product_name', 'target_name'],
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)
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WEBSCRAPING_SCRAPE_TARGET_FAILURE = Counter(
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'webscraping_scrape_target_failure_total',
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'The number of failed scrape and parse of a scrape target',
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['product_name', 'target_name'],
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)
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def main():
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parser = argparse.ArgumentParser("An utility to scrape e-commerce product price and expose them as prometheus metrics")
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parser.add_argument(
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'-c', '--config',
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help='The configuration file. (default: %(default)s)',
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type=str,
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default='webscraping-exporter.yml',
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)
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parser.add_argument(
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'-i', '--interval',
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help='The target scrape interval, in minutes. (default: %(default)s)',
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type=float,
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default=15,
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)
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parser.add_argument(
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'--user-agent',
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help='The user-agent to spoof. (default: %(default)s)',
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type=str,
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default='Mozilla/5.0 (X11; Linux x86_64; rv:106.0) Gecko/20100101 Firefox/106.0',
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)
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parser.add_argument(
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'-p', '--listen-port',
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help='The listen port for the http server. (default: %(default)s)',
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type=int,
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default=8000,
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)
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parser.add_argument(
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'-a', '--listen-address',
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help='The listen address for the http server. (default: %(default)s)',
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type=str,
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default='0.0.0.0',
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)
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args = parser.parse_args()
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scrape_targets = parse_config(args.config)
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# setup the headers for each scrape targets
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for scrape_target in scrape_targets:
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scrape_target.headers = {
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'Accept': '*/*',
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'User-Agent': args.user_agent,
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}
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# start the http server to server the prometheus metrics
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start_http_server(args.listen_port, args.listen_address)
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# start the main loop
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while True:
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for scrape_target in scrape_targets:
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value = scrape_target.query_target()
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if value is not None:
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WEBSCRAPING_SCRAPE_TARGET_VALUE.labels(product_name=scrape_target.product_name,target_name=scrape_target.target_name).set(value)
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WEBSCRAPING_SCRAPE_TARGET_SUCCESS.labels(product_name=scrape_target.product_name,target_name=scrape_target.target_name).inc()
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else:
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WEBSCRAPING_SCRAPE_TARGET_FAILURE.labels(product_name=scrape_target.product_name,target_name=scrape_target.target_name).inc()
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time.sleep(args.interval * 60)
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def parse_config(config_filename):
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result = []
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print('Loading configurations from %s' % config_filename)
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with open(config_filename, 'r') as f:
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config = yaml.safe_load(f)
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# iterate through products listed in the configuration
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products = get_field_or_die(config, 'products')
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for product in products:
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product_name = get_field_or_die(product, 'name')
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# iterate through the targets listed for each products in the configuration
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targets = get_field_or_die(product, 'targets')
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for target in targets:
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# Create a ScrapeTarget for each targets to scrape
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result.append(ScrapeTarget(
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product_name=product_name,
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url=get_field_or_die(target, 'url'),
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selector=get_field_or_die(target, 'selector'),
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target_name=target.get('name'),
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regex=target.get('regex'),
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parser=target.get('parser'),
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))
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return result
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def get_field_or_die(mapping, field_name):
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value = mapping.get(field_name)
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if value is None:
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raise Exception('Missing required field: %s' % field_name)
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else:
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return value
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if __name__ == '__main__':
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main() |