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Initial commit of eomyidae prototype. - eomyidae - a gopher crawler software
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DIR commit 4995600199617764df0cb6e5dd327a5c3e0594af
HTML Author: Christoph Lohmann <20h@r-36.net>
Date: Sun, 4 Aug 2019 07:01:17 +0200
Initial commit of eomyidae prototype.
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A LICENSE | 676 +++++++++++++++++++++++++++++++
A README.md | 9 +++++++++
A eomyidae | 633 +++++++++++++++++++++++++++++++
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DIR diff --git a/LICENSE b/LICENSE
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+© 2019 Christoph Lohmann <20h at r-36 dot net>
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+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+ 17. Interpretation of Sections 15 and 16.
+
+ If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
DIR diff --git a/README.md b/README.md
@@ -0,0 +1,9 @@
+# Eomyidae, the flying gopher.
+
+Eomyidae is a crawler for gopherspace.
+
+This README will be extended over time.
+
+
+Have fun!
+
DIR diff --git a/eomyidae b/eomyidae
@@ -0,0 +1,633 @@
+#!/usr/bin/env python
+# coding=utf-8
+#
+# © 2019 Christoph Lohmann <20h@r-36.net>
+#
+# This file is published under the terms of the GPLv3.
+#
+
+import os
+import sys
+import getopt
+import urllib.parse
+import socket
+import io
+import pickle
+import time
+import hashlib
+import errno
+import random
+import operator
+import math
+from multiprocessing import Pool
+from datetime import datetime
+from datetime import timedelta
+
+def parseuri(uri):
+ urls = urllib.parse.urlparse(uri, allow_fragments=False)
+ if ":" in urls.netloc:
+ (host, port) = urls.netloc.split(":")[:2]
+ else:
+ host = urls.netloc
+ port = 70
+
+ mtype = "1"
+ if len(urls.path) > 1:
+ mtype = urls.path[1]
+
+ if len(urls.path) > 2:
+ if len(urls.query) > 0:
+ selector = "%s?%s" % (urls.path[2:], urls.query)
+ else:
+ selector = urls.path[2:]
+ else:
+ selector = ""
+
+ return (host, port, mtype, selector)
+
+def poolgopher(req):
+ data = gopher(req[0], req[1], req[2], req[3])
+ req.append(data)
+ return req
+
+def gopher(uri=None, host=None, port=70, selector=""):
+ #print("gopher(uri = %s, host = %s, port = %d, selector = %s)" % \
+ # (uri, host, port, selector))
+ if uri != None:
+ (host, port, mtype, selector) = parseuri(uri)
+ port = int(port)
+
+ s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+ s.settimeout(20)
+ try:
+ s.connect((host, port))
+ except socket.gaierror:
+ return ""
+ except socket.timeout:
+ return ""
+ except TimeoutError:
+ return ""
+ except ConnectionResetError:
+ return ""
+ except OverflowError:
+ return ""
+ except OSError as e:
+ # No route to host.
+ if e.errno == 113:
+ return ""
+
+ try:
+ s.send(("%s\r\n" % (selector)).encode("utf-8"))
+ except BrokenPipeError:
+ return ""
+
+ fd = s.makefile("b")
+ try:
+ data = fd.read()
+ except socket.timeout:
+ fd.close()
+ return ""
+ except ConnectionResetError:
+ fd.close()
+ return ""
+ fd.close()
+
+ try:
+ content = data.decode(errors='replace')
+ except UnicodeDecodeError:
+ content = data.decode("iso-8859-1")
+
+ return content
+
+def parsemenu(data):
+ menu = []
+ lines = data.split("\n")
+ for line in lines:
+ line = line.strip()
+ if len(line) < 1:
+ continue
+
+ mtype = line[0]
+
+ # Last entry
+ if mtype == ".":
+ break
+
+ elements = line[1:].split("\t")
+ if len(elements) < 4:
+ continue
+ (description, selector, host, port) = elements[:4]
+ menu.append([mtype, description, selector, host, port])
+
+ return menu
+
+def menu2text(menu):
+ text = ""
+ for entry in menu:
+ if type(entry[1]) != str:
+ continue
+
+ text += "%s\n" % (entry[1])
+
+ return text
+
+## Robots.txt
+# https://en.wikipedia.org/wiki/Robots.txt
+# # Comment
+# User-agent: somebot
+# Disallow: /path
+# Allow: /path
+# Crawl-delay: seconds
+# Sitemap: /some/sitemap.xml
+def parserobots(data):
+ robots = []
+ lines = data.split("\n")
+ for line in lines:
+ line = line.strip()
+ if "#" in line:
+ (line, comment) = line.split("#", 1)
+ if len(line) < 0:
+ # Empty line, needed for bot-specific rules.
+ robots.append(["",""])
+ continue
+ if not ":" in line:
+ continue
+
+ (header, value) = line.strip().split(":", 1)
+ value = value.strip().lower()
+ header = header.strip().lower()
+ robots.append([header, value])
+ return robots
+
+def adaptrobots(robotsdata):
+ filterlines = {}
+ robotslines = parserobots(robotsdata)
+ i = 0
+
+ allowlines = []
+ disallowlines = []
+ otherlines = []
+ iseomyidae = False
+ while i < len(robotslines):
+ header = robotslines[i][0].lower()
+ value = robotslines[i][1]
+ if header == "user-agent":
+ ua = value.split("/")
+ if ua[0] == "eomyidae" or ua[0] == "*":
+ iseomyidae = 1
+ else:
+ iseomyidae = 0
+ elif header == "allow" and iseomyidae == True:
+ allowlines.append(value)
+ elif header == "disallow" and iseomyidae == True:
+ disallowlines.append(value)
+ elif header == "":
+ iseomyidae = False
+ else:
+ if iseomyidae == True:
+ otherlines.append([header, value])
+ i += 1
+
+ filterlines["allow"] = allowlines
+ filterlines["disallow"] = disallowlines
+ filterlines["other"] = otherlines
+ if len(allowlines) > 0 or len(disallowlines) > 0 \
+ or len(otherlines) > 0:
+ filterlines["empty"] = False
+ else:
+ filterlines["empty"] = True
+
+ return filterlines
+
+def mkpath(cachepath):
+ try:
+ os.makedirs(cachepath)
+ except OSError as e:
+ if e.errno != errno.EEXIST:
+ raise
+
+def mkopen(cachefile):
+ if not os.path.exists(cachefile):
+ fd = open(cachefile, "xb")
+ else:
+ fd = open(cachefile, "wb")
+ return fd
+
+def informserveradmin(uri, host=None, port=70):
+ if host == None:
+ (host, port, mtype, selector) = parseuri(uri)
+ port = int(port)
+
+ # We are nice and inform before every robots.txt, how to contact us.
+ gopher(host=host, port=port, selector="This is eomyidae, your "
+ "friendly crawler. See "
+ "gopher://gopherproject.org/1/eomyidae for "
+ "more info. Have a nice day!")
+
+def cacherobots(cachedir, uri, host=None, port=70, force=False, \
+ filtercache=None):
+ if host == None:
+ (host, port, mtype, selector) = parseuri(uri)
+ port = int(port)
+
+ if filtercache != None and host in filtercache:
+ #print("Got filterlines from memory filtercache.")
+ return filtercache[host]
+
+ print("Getting robots for %s:%d" % (host, port))
+
+ cachepath = "%s/%s:%d" % (cachedir, host, port)
+ mkpath(cachepath)
+
+ cacherobotstxt = "%s/robots.txt" % (cachepath)
+ cacherobotspickle = "%s/robots.pickle" % (cachepath)
+ filterlines = {}
+ if not os.path.exists(cacherobotstxt) or force == True:
+ # Be nice.
+ informserveradmin(uri=uri, host=host, port=port)
+
+ robotsdata = gopher(host=host, port=port, selector="/robots.txt")
+ print("Got new robots.txt.")
+ print(robotsdata)
+ robotstxtfd = mkopen(cacherobotstxt)
+ robotstxtfd.write(robotsdata.encode())
+ robotstxtfd.close()
+
+ filterlines = adaptrobots(robotsdata)
+ # Do not store if there is nothing, so we save I/O later.
+ if filterlines["empty"] == False:
+ print("Storing filterlines.")
+ storelistdb(cacherobotspickle, filterlines)
+
+ else:
+ if os.path.exists(cacherobotspickle):
+ #print("Loading filterlines from cache.")
+ filterlines = loadlistdb(cacherobotspickle)
+ else:
+ #print("No filterlines available in cache.")
+ filterlines["empty"] = True
+
+ #print(filterlines)
+ if filtercache != None:
+ filtercache[host] = filterlines
+
+ return filterlines
+
+def selectorisallowed(filterlines, selector):
+ if filterlines["empty"] == True:
+ return True
+
+ def robotsmatch(pattern, selector):
+ #print("pattern = %s, selector = %s" % (pattern, selector))
+ if pattern == '*':
+ #print("Just start match.")
+ return True
+ elif pattern[0] == '*':
+ #print("Begins with star.")
+ if pattern[-1] == '*':
+ #print("Begins and ends with star.")
+ if pattern[1:-1] in selector:
+ #print("Matches.")
+ return True
+ else:
+ return False
+ else:
+ return selector.endswith(pattern[1:])
+ elif pattern[-1] == '*':
+ #print("Ends with star.")
+ return selector.startswith(pattern[:-1])
+ else:
+ return selector.startswith(pattern)
+
+ isallowed = True
+ for line in filterlines["disallow"]:
+ # TODO: Should this be match everything?
+ if len(line) == 0:
+ continue
+ if robotsmatch(line, selector) == True:
+ #print("isallowed = False")
+ isallowed = False
+ for line in filterlines["allow"]:
+ # TODO: Should this be match everything?
+ if len(line) == 0:
+ continue
+ if robotsmatch(line, selector) == True:
+ #print("isallowed = True")
+ isallowed = True
+
+ #print("isallowed = %d" % (isallowed))
+ return isallowed
+
+def loadselectorstxt(filename):
+ selectors = []
+
+ if os.path.exists(filename):
+ fd = open(filename, "r")
+ for line in fd:
+ fields = line.split("|")
+ selectors.append(fields)
+ fd.close()
+
+ return selectors
+
+def loadlist(filename):
+ listelems = []
+
+ if os.path.exists(filename):
+ fd = open(filename, "r")
+ for line in fd:
+ line = line.strip()
+ if len(line) == 0:
+ continue
+ if line[0] == "#":
+ continue
+ listelems.append(line)
+ fd.close()
+
+ return listelems
+
+def loadlistdb(filename):
+ listelems = []
+
+ if os.path.exists(filename):
+ fd = open(filename, "rb")
+ try:
+ listelems = pickle.load(fd)
+ except EOFError:
+ return []
+ fd.close()
+
+ return listelems
+
+def storelistdb(filename, listelems):
+ fd = mkopen(filename)
+ pickle.dump(listelems, fd)
+ fd.close()
+
+def storerawdata(cachedir, uri, data, host=None, port=70):
+ if host == None:
+ (host, port, mtype, selector) = parseuri(uri)
+ port = int(port)
+
+ cachepath = "%s/%s:%s" % (cachedir, host, port)
+ mkpath(cachepath)
+
+ m = hashlib.sha256()
+ m.update(uri.encode())
+ urihash = m.hexdigest()
+
+ cachepath = "%s/%s.menu" % (cachepath, urihash)
+ fd = mkopen(cachepath)
+ #print("Storing %s at %s" % (uri, cachepath))
+ fd.write(("%s\n" % (uri)).encode())
+ fd.write(data.encode())
+ fd.close()
+
+def usage(app):
+ app = os.path.basename(app)
+ print("usage: %s [-hor] [-b base] [-f blocklist] [-w n] [starturl]" % (app), file=sys.stderr)
+ sys.exit(1)
+
+def main(args):
+ try:
+ opts, largs = getopt.getopt(args[1:], "hb:f:ow:r")
+ except getopt.GetoptError as err:
+ print(str(err))
+ usage(args[0])
+
+ blocklistfile = None
+ blocklist = []
+
+ base = "."
+ starturi = None
+ workernum = 1
+ robotscache = {}
+ forcehostscount = False
+ for o, a in opts:
+ if o == "-h":
+ usage(args[0])
+ elif o == "-b":
+ base = a
+ elif o == "-f":
+ blocklistfile = a
+ blocklist = loadlist(blocklistfile)
+ print("blocklist: %s" % (blocklist))
+ elif o == "-o":
+ forcehostscount = True
+ elif o == "-r":
+ # Do not cache robots.txt in memory.
+ robotscache = None
+ elif o == "-w":
+ try:
+ workernum = int(a)
+ except ValueError:
+ workernum = 1
+ else:
+ assert False, "unhandled option"
+
+ os.chdir(base)
+ cachedir = "%s/cache" % (base)
+
+ if len(largs) > 0:
+ starturi = largs[0]
+
+ knownuris = loadlistdb("knownuris.pickle")
+ lastlenknownuris = len(knownuris)
+
+ def isblocked(uri):
+ for rule in blocklist:
+ if uri.startswith(rule):
+ return True
+ return False
+
+ def addhostscount(host):
+ if host in hostscount:
+ hostscount[host] += 1
+ else:
+ hostscount[host] = 1
+
+ def subhostscount(host):
+ if host in hostscount:
+ hostscount[host] -= 1
+ if hostscount[host] <= 0:
+ del hostscount[host]
+
+ def addhostscache(host, uri, port=70):
+ if uri in knownuris:
+ #print("ignored for queue: %s" % (uri))
+ return
+ if host == "":
+ #print("ignored for queue: %s" % (uri))
+ return
+ if isblocked(uri):
+ print("blocked by filters: %s" % (uri))
+ return
+
+ try:
+ port = int(port)
+ except ValueError:
+ return
+
+ addhostscount(host)
+
+ filterrules = cacherobots(cachedir, uri, \
+ host=host, \
+ port=port, \
+ filtercache=robotscache)
+ if selectorisallowed(filterrules, selector) == True:
+ if not host in hostscache:
+ hostscache[host] = {}
+ if not "queue" in hostscache[host]:
+ hostscache[host]["queue"] = {}
+ hostscache[host]["queue"][uri] = None
+ #print("pushed to queue: %s" % (uri))
+ else:
+ pass
+ #print("blocked by robots: %s" % (uri))
+
+ def getqueuelen():
+ queuelen = 0
+ for host in hostscache:
+ queuelen += len(hostscache[host]["queue"])
+ return queuelen
+
+ hostscache = loadlistdb("hostscache.pickle")
+ if hostscache == []:
+ hostscache = {}
+ hostscount = loadlistdb("hostscount.pickle")
+ if hostscount == [] or forcehostscount == True:
+ hostscount = {}
+ for host in list(hostscache.keys()):
+ print("host = %s, queuelen = %d" \
+ % (host, \
+ len(hostscache[host]["queue"])))
+ if len(hostscache[host]["queue"]) == 0:
+ del hostscache[host]
+ continue
+ for uri in hostscache[host]["queue"]:
+ (host, port, mtype, selector) = parseuri(uri)
+ addhostscount(host)
+
+ def storestate():
+ if blocklistfile != None:
+ blocklist = loadlist(blocklistfile)
+ if len(blocklist) > 0:
+ print("blocklist: %s" % (blocklist))
+ print("################## Storing state to disc.")
+ storelistdb("knownuris.pickle", knownuris)
+ storelistdb("hostscache.pickle", hostscache)
+ storelistdb("hostscount.pickle", hostscount)
+ print("################## Storing state to disc done.")
+
+ jobs = []
+ if starturi != None:
+ if not isblocked(starturi):
+ (starthost, startport, startmtype, startselector) = parseuri(starturi)
+ addhostscache(hostscache, starthost, starturi)
+ try:
+ jobs.append([starturi, starthost, int(startport), startselector])
+ except ValueError:
+ # Please fix your URI.
+ pass
+
+ # Store state keeper.
+ startnow = datetime.now()
+ storedelta = timedelta(seconds=10) # 30 seconds
+
+ lastlenknownhosts = len(hostscache)
+ lastlenuriqueue = getqueuelen()
+ while lastlenuriqueue > 0:
+ if len(jobs) < workernum:
+ for host in list(hostscache.keys()):
+ if len(hostscache[host]["queue"]) == 0:
+ del hostscache[host]
+ if host in hostscount:
+ del hostscount[host]
+
+ selhosts = sorted(hostscount.items(), \
+ key=operator.itemgetter(1))[:workernum*2]
+
+ # Give hosts with many selectors more jobs.
+ hostjobs = {}
+ for selhost in selhosts:
+ # 10 ** x
+ hostjobs[selhost[0]] = \
+ math.floor(math.log10(selhost[1]))
+ if hostjobs[selhost[0]] == 0:
+ hostjobs[selhost[0]] = 1
+ print("Queue Status: %s" % (hostjobs))
+
+ for selhost in selhosts:
+ selhost = selhost[0]
+ seluris = hostscache[selhost]["queue"]
+ while hostjobs[selhost] > 0:
+ if len(seluris) == 0:
+ break
+ jobitem = seluris.popitem()
+ if isblocked(jobitem[0]):
+ continue
+ (host, port, mtype, selector) = parseuri(jobitem[0])
+ jobs.append([jobitem[0], host, port, selector])
+ hostjobs[selhost] -= 1
+
+ print("Getting %d jobs." % (len(jobs)))
+
+ dataresults = []
+ with Pool(processes=workernum) as pool:
+ dataresults = pool.map(poolgopher, jobs)
+ #data = gopher(host=host, port=port, selector=selector)
+ jobs = []
+
+ for dataresult in dataresults:
+ (cururi, host, port, selector, data) = dataresult
+ subhostscount(host)
+ storerawdata(cachedir, cururi, data, host=host, port=port)
+ menudata = parsemenu(data)
+ #print(menudata)
+ for mi in menudata:
+ # Only menus so far.
+ if mi[0] == "1":
+ # Fix menu items with ports in hosts.
+ if ":" in mi[3]:
+ mi[3] = mi[3].split(":")[0]
+
+ guri = "gopher://%s:%s/%s%s" % \
+ (mi[3], mi[4], mi[0], mi[2])
+
+ addhostscache(mi[3], guri, port=mi[4])
+
+ print("Uri %s done." % (cururi))
+ knownuris[cururi] = None
+
+ lenuriqueue = getqueuelen()
+ lenknownuris = len(knownuris)
+ lenknownhosts = len(hostscache)
+ print("> queue hosts = %d (%d) %s" % \
+ (lenknownhosts, lenknownhosts -
+ lastlenknownhosts, hostscache.keys()))
+ print("> uri queue len = %d (%d)" % \
+ (lenuriqueue, lenuriqueue - lastlenuriqueue))
+ print("> visited uris = %d (%d)" % \
+ (lenknownuris, lenknownuris - lastlenknownuris))
+ lastlenknownuris = lenknownuris
+ lastlenuriqueue = lenuriqueue
+ lastlenknownhosts = lenknownhosts
+
+ # TODO: Remove after debugging
+ nowdelta = datetime.now() - startnow
+ if nowdelta >= storedelta:
+ storestate()
+ startnow = datetime.now()
+
+ time.sleep(0.2) # don't be too harsh on servers
+
+ #break #oneshot
+
+ # Save at end of even single shot.
+ storestate()
+
+ return 0
+
+if __name__ == "__main__":
+ sys.exit(main(sys.argv))
+