| #http://packages.python.org/CouchDB/client.html | #http://packages.python.org/CouchDB/client.html |
| import couchdb | import couchdb |
| import urllib2 | import urllib2 |
| from BeautifulSoup import BeautifulSoup | from BeautifulSoup import BeautifulSoup |
| import re | import re |
| import hashlib | import hashlib |
| from urlparse import urljoin | |
| import time | |
| import os | |
| #http://diveintopython.org/http_web_services/etags.html | #http://diveintopython.org/http_web_services/etags.html |
| class NotModifiedHandler(urllib2.BaseHandler): | class NotModifiedHandler(urllib2.BaseHandler): |
| def http_error_304(self, req, fp, code, message, headers): | def http_error_304(self, req, fp, code, message, headers): |
| addinfourl = urllib2.addinfourl(fp, headers, req.get_full_url()) | addinfourl = urllib2.addinfourl(fp, headers, req.get_full_url()) |
| addinfourl.code = code | addinfourl.code = code |
| return addinfourl | return addinfourl |
| def scrapeAndStore(docsdb, url, depth, agencyID): | def fetchURL(docsdb, url, fieldName, agencyID, scrape_again=True): |
| hash = hashlib.md5(url).hexdigest() | hash = hashlib.md5(url).hexdigest() |
| req = urllib2.Request(url) | req = urllib2.Request(url) |
| print "Fetching %s", url | print "Fetching %s" % url |
| doc = docsdb['hash'] | doc = docsdb.get(hash) |
| if doc == None: | |
| doc = {'_id': hash, 'agencyID': agencyID, 'url': url, 'fieldName':fieldName} | |
| else: | |
| if (time.time() - doc['page_scraped']) < 3600: | |
| print "Uh oh, trying to scrape URL again too soon!" | |
| last_attachment_fname = doc["_attachments"].keys()[-1] | |
| last_attachment = docsdb.get_attachment(doc,last_attachment_fname) | |
| return (doc['mime_type'],last_attachment) | |
| if scrape_again == False: | |
| print "Not scraping this URL again as requested" | |
| return (None,None) | |
| time.sleep(3) # wait 3 seconds to give webserver time to recover | |
| #if there is a previous version stored in couchdb, load caching helper tags | #if there is a previous version stored in couchdb, load caching helper tags |
| if doc.has_key('etag'): | if doc.has_key('etag'): |
| req.add_header("If-None-Match", doc['etag']) | req.add_header("If-None-Match", doc['etag']) |
| if doc.has_key('last_modified'): | if doc.has_key('last_modified'): |
| req.add_header("If-Modified-Since", doc['last_modified']) | req.add_header("If-Modified-Since", doc['last_modified']) |
| opener = urllib2.build_opener(NotModifiedHandler()) | opener = urllib2.build_opener(NotModifiedHandler()) |
| url_handle = opener.open(req) | url_handle = opener.open(req) |
| headers = url_handle.info() # the addinfourls have the .info() too | headers = url_handle.info() # the addinfourls have the .info() too |
| doc['etag'] = headers.getheader("ETag") | doc['etag'] = headers.getheader("ETag") |
| doc['last_modified'] = headers.getheader("Last-Modified") | doc['last_modified'] = headers.getheader("Last-Modified") |
| doc['date'] = headers.getheader("Date") | |
| doc['page_scraped'] = time.time() | |
| doc['web_server'] = headers.getheader("Server") | doc['web_server'] = headers.getheader("Server") |
| doc['powered_by'] = headers.getheader("X-Powered-By") | |
| doc['file_size'] = headers.getheader("Content-Length") | doc['file_size'] = headers.getheader("Content-Length") |
| doc['mime_type'] = headers.getheader("Content-Type") | doc['mime_type'] = headers.getheader("Content-Type").split(";")[0] |
| if hasattr(url_handle, 'code'): | if hasattr(url_handle, 'code'): |
| if url_handle.code == 304: | if url_handle.code == 304: |
| print "the web page has not been modified" | print "the web page has not been modified" |
| return (None,None) | |
| else: | else: |
| #do scraping | content = url_handle.read() |
| html = url_handle.read() | docsdb.save(doc) |
| # http://www.crummy.com/software/BeautifulSoup/documentation.html | doc = docsdb.get(hash) # need to get a _rev |
| soup = BeautifulSoup(html) | docsdb.put_attachment(doc, content, str(time.time())+"-"+os.path.basename(url), doc['mime_type']) |
| links = soup.findAll('a') # soup.findAll('a', id=re.compile("^p-")) | return (doc['mime_type'], content) |
| for link in links: | |
| if link.has_key("href"): | |
| print link['href'] | |
| #for each unique link | |
| #if html mimetype | |
| # go down X levels, | |
| # diff with last stored attachment, store in document | |
| #if not | |
| # remember to save parentURL and title (link text that lead to document) | |
| #store as attachment epoch-filename | #store as attachment epoch-filename |
| else: | else: |
| print "error %s in downloading %s", url_handle.code, URL | print "error %s in downloading %s" % url_handle.code, URL |
| #record/alert error to error database | doc['error'] = "error %s in downloading %s" % url_handle.code, URL |
| docsdb.save(doc) | |
| return (None,None) | |
| def scrapeAndStore(docsdb, url, depth, fieldName, agencyID): | |
| (mime_type,content) = fetchURL(docsdb, url, fieldName, agencyID) | |
| if content != None and depth > 0: | |
| if mime_type == "text/html" or mime_type == "application/xhtml+xml" or mime_type =="application/xml": | |
| # http://www.crummy.com/software/BeautifulSoup/documentation.html | |
| soup = BeautifulSoup(content) | |
| navIDs = soup.findAll(id=re.compile('nav|Nav|menu|bar')) | |
| for nav in navIDs: | |
| print "Removing element", nav['id'] | |
| nav.extract() | |
| navClasses = soup.findAll(attrs={'class' : re.compile('nav|menu|bar')}) | |
| for nav in navClasses: | |
| print "Removing element", nav['class'] | |
| nav.extract() | |
| links = soup.findAll('a') # soup.findAll('a', id=re.compile("^p-")) | |
| linkurls = set([]) | |
| for link in links: | |
| if link.has_key("href"): | |
| if link['href'].startswith("http"): | |
| # lets not do external links for now | |
| # linkurls.add(link['href']) | |
| None | |
| else: | |
| linkurls.add(urljoin(url,link['href'].replace(" ","%20"))) | |
| for linkurl in linkurls: | |
| #print linkurl | |
| scrapeAndStore(docsdb, linkurl, depth-1, fieldName, agencyID) | |
| couch = couchdb.Server('http://127.0.0.1:5984/') | |
| couch = couchdb.Server('http://192.168.1.148:5984/') | |
| # select database | # select database |
| agencydb = couch['disclosr-agencies'] | agencydb = couch['disclosr-agencies'] |
| docsdb = couch['disclosr-documents'] | docsdb = couch['disclosr-documents'] |
| for row in agencydb.view('app/getScrapeRequired'): #not recently scraped agencies view? | for row in agencydb.view('app/getScrapeRequired'): #not recently scraped agencies view? |
| agency = agencydb.get(row.id) | agency = agencydb.get(row.id) |
| print agency['name'] | print agency['name'] |
| scrapeAndStore(docsdb, agency['website'],1,agency['_id']) | for key in agency.keys(): |
| if key == 'website' or key.endswith('URL'): | |
| print key | |
| scrapeAndStore(docsdb, agency[key],agency['scrapeDepth'],key,agency['_id']) | |
| agency['metadata']['lastscraped'] = time.time() | |
| agencydb.save(agency) | |