overhaul the try_ip function's async stuff
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parent
55024634f7
commit
3ca869ccad
103
respodns/dns.py
103
respodns/dns.py
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@ -33,14 +33,14 @@ def detect_gfw(r, ip, check):
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return False
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async def getaddrs(server, domain, opts, context=None):
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async def getaddrs(server, domain, impatient=False, context=None):
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from .ip_util import ipkey
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from dns.asyncresolver import Resolver
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from dns.exception import Timeout
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from dns.resolver import NXDOMAIN, NoAnswer, NoNameservers
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res = Resolver(configure=False)
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if opts.impatient:
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if impatient:
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res.timeout = 5
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res.lifetime = 2
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else:
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@ -120,59 +120,61 @@ def process_result(res, ip, check, opts: Options):
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)
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def find_failure(entries):
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assert len(entries) > 0
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for entry in entries:
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if not entry.success:
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return entry
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assert False, ("no failures found:", entries)
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async def try_ip(db, server_ip, checks, context, opts: Options, callback=None):
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# context can be None.
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from .util import make_pooler
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from asyncio import sleep, CancelledError
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from asyncio import sleep, create_task, CancelledError, BoundedSemaphore
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sem = BoundedSemaphore(opts.domain_simul)
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entries = []
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tasks = []
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success = True
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def finisher(done, pending):
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async def _process(check):
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nonlocal success
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for task in done:
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try:
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res, ip, check = task.result()
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except CancelledError:
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success = False
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break
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entry = process_result(res, ip, check, opts)
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if callback is not None:
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for addr in entry.addrs:
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callback(addr)
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entries.append(entry)
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if not entry.success:
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if opts.early_stopping and success: # only cancel once
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for pend in pending:
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# FIXME: this can still, somehow,
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# cancel the main function.
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pend.cancel()
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success = False
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res = await getaddrs(server_ip, check.domain, opts.impatient, context)
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entry = process_result(res, server_ip, check, opts)
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if callback is not None:
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for addr in entry.addrs:
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callback(addr)
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entries.append(entry)
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if not entry.success:
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if opts.early_stopping and success: # only cancel once
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for task in tasks:
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if not task.done() and not task.cancelled():
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task.cancel()
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success = False
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pooler = make_pooler(opts.domain_simul, finisher)
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# limit to one connection until the first check completes.
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await _process(checks[0])
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async def getaddrs_wrapper(ip, check):
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# NOTE: could put right_now() stuff here!
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# TODO: add duration field given in milliseconds (integer)
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# by subtracting start and end datetimes.
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res = await getaddrs(ip, check.domain, opts, context)
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return res, ip, check
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async def process(check):
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try:
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await _process(check)
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finally:
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sem.release()
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#lament("TESTING", server_ip)
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for i, check in enumerate(checks):
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first = i == 0
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if not first:
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for check in checks[1:]:
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if len(tasks) > 0:
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await sleep(opts.domain_wait)
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await pooler(getaddrs_wrapper(server_ip, check))
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if first:
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# limit to one connection for the first check.
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await pooler()
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# acquire now instead of within the task so
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# a ton of tasks aren't created all at once.
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await sem.acquire()
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if not success:
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if opts.early_stopping or first:
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break
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else:
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await pooler()
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break
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#lament("ENTRY", server_ip, check)
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task = create_task(process(check))
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tasks.append(task)
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for task in tasks:
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if not task.cancelled():
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await task
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if not opts.dry:
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for entry in entries:
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@ -181,17 +183,7 @@ async def try_ip(db, server_ip, checks, context, opts: Options, callback=None):
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#lament("TESTED", server_ip)
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if not success:
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first_failure = None
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assert len(entries) > 0
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for entry in entries:
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if not entry.success:
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first_failure = entry
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break
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else:
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assert 0, ("no failures found:", entries)
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return first_failure
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return None
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return None if success else find_failure(entries)
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async def try_all_ips(db, try_me, checks, context, opts: Options, callback=None):
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@ -341,11 +333,12 @@ async def main(db, filepaths, checks, ipinfo, opts: Options):
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await reading
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#lament("AWAITED reading")
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if seen == 0:
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if seen == 0 and db is not None:
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#lament("UPDATING country codes")
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# no IPs were provided. refresh all the country codes instead.
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all_ips = db.all_ips()
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for i, ip in enumerate(all_ips):
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#lament("UPDATING", ip)
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if opts.progress:
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lament(f"#{i + 1}/{len(all_ips)}: {ip}")
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await locate_me.put(ip)
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@ -45,38 +45,6 @@ def head(n, it):
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return res
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def taskize(item):
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from types import CoroutineType
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from asyncio import Task, create_task
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if isinstance(item, CoroutineType):
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assert not isinstance(item, Task) # TODO: paranoid?
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item = create_task(item)
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return item
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def make_pooler(pool_size, finisher=None):
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# TODO: write a less confusing interface
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# that allows the code to be written more flatly.
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# maybe like: async for done in apply(doit, [tuple_of_args]):
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from asyncio import wait, FIRST_COMPLETED
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pending = set()
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async def pooler(item=None):
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nonlocal pending
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finish = item is None
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if not finish:
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pending.add(taskize(item))
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desired_size = 0 if finish else pool_size - 1
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while len(pending) > desired_size:
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done, pending = await wait(pending, return_when=FIRST_COMPLETED)
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if finisher is not None:
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finisher(done, pending)
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return pooler
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class AttrCheck:
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"""
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Inheriting AttrCheck prevents accidentally setting attributes
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