lbry-sdk/lbrynet/core/utils.py

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import base64
import datetime
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import random
import socket
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import string
import json
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import traceback
import functools
import logging
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import pkg_resources
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from twisted.python.failure import Failure
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from twisted.internet import defer
from lbryschema.claim import ClaimDict
from lbrynet.core.cryptoutils import get_lbry_hash_obj
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log = logging.getLogger(__name__)
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# digest_size is in bytes, and blob hashes are hex encoded
blobhash_length = get_lbry_hash_obj().digest_size * 2
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# defining these time functions here allows for easier overriding in testing
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def now():
return datetime.datetime.now()
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def utcnow():
return datetime.datetime.utcnow()
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def isonow():
"""Return utc now in isoformat with timezone"""
return utcnow().isoformat() + 'Z'
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def today():
return datetime.datetime.today()
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def timedelta(**kwargs):
return datetime.timedelta(**kwargs)
def datetime_obj(*args, **kwargs):
return datetime.datetime(*args, **kwargs)
def call_later(delay, func, *args, **kwargs):
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# Import here to ensure that it gets called after installing a reactor
# see: http://twistedmatrix.com/documents/current/core/howto/choosing-reactor.html
from twisted.internet import reactor
return reactor.callLater(delay, func, *args, **kwargs)
def safe_start_looping_call(looping_call, interval_sec):
if not looping_call.running:
looping_call.start(interval_sec)
def safe_stop_looping_call(looping_call):
if looping_call.running:
looping_call.stop()
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def generate_id(num=None):
h = get_lbry_hash_obj()
if num is not None:
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h.update(str(num).encode())
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else:
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h.update(str(random.getrandbits(512)).encode())
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return h.digest()
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def is_valid_hashcharacter(char):
return char in "0123456789abcdef"
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def is_valid_blobhash(blobhash):
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"""Checks whether the blobhash is the correct length and contains only
valid characters (0-9, a-f)
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@param blobhash: string, the blobhash to check
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@return: True/False
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"""
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return len(blobhash) == blobhash_length and all(is_valid_hashcharacter(l) for l in blobhash)
def version_is_greater_than(a, b):
"""Returns True if version a is more recent than version b"""
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return pkg_resources.parse_version(a) > pkg_resources.parse_version(b)
def deobfuscate(obfustacated):
return base64.b64decode(obfustacated.decode('rot13'))
def obfuscate(plain):
return base64.b64encode(plain).encode('rot13')
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def check_connection(server="lbry.io", port=80, timeout=2):
"""Attempts to open a socket to server:port and returns True if successful."""
log.debug('Checking connection to %s:%s', server, port)
try:
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server = socket.gethostbyname(server)
socket.create_connection((server, port), timeout)
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log.debug('Connection successful')
return True
except (socket.gaierror, socket.herror) as ex:
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log.warning("Failed to connect to %s:%s. Unable to resolve domain. Trying to bypass DNS",
server, port)
try:
server = "8.8.8.8"
port = 53
socket.create_connection((server, port), timeout)
log.debug('Connection successful')
return True
except Exception as ex:
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log.error("Failed to connect to %s:%s. Maybe the internet connection is not working",
server, port)
return False
except Exception as ex:
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log.error("Failed to connect to %s:%s. Maybe the internet connection is not working",
server, port)
return False
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def random_string(length=10, chars=string.ascii_lowercase):
return ''.join([random.choice(chars) for _ in range(length)])
def short_hash(hash_str):
return hash_str[:6]
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def get_sd_hash(stream_info):
if not stream_info:
return None
if isinstance(stream_info, ClaimDict):
return stream_info.source_hash
result = stream_info.get('claim', {}).\
get('value', {}).\
get('stream', {}).\
get('source', {}).\
get('source')
if not result:
log.warn("Unable to get sd_hash")
return result
def json_dumps_pretty(obj, **kwargs):
return json.dumps(obj, sort_keys=True, indent=2, separators=(',', ': '), **kwargs)
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class DeferredLockContextManager(object):
def __init__(self, lock):
self._lock = lock
def __enter__(self):
yield self._lock.aquire()
def __exit__(self, exc_type, exc_val, exc_tb):
yield self._lock.release()
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@defer.inlineCallbacks
def DeferredDict(d, consumeErrors=False):
keys = []
dl = []
response = {}
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for k, v in d.items():
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keys.append(k)
dl.append(v)
results = yield defer.DeferredList(dl, consumeErrors=consumeErrors)
for k, (success, result) in zip(keys, results):
if success:
response[k] = result
defer.returnValue(response)
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class DeferredProfiler(object):
def __init__(self):
self.profile_results = {}
def add_result(self, fn, start_time, finished_time, stack, success):
self.profile_results[fn].append((start_time, finished_time, stack, success))
def show_profile_results(self, fn):
profile_results = list(self.profile_results[fn])
call_counts = {
caller: [(start, finished, finished - start, success)
for (start, finished, _caller, success) in profile_results
if _caller == caller]
for caller in set(result[2] for result in profile_results)
}
log.info("called %s %i times from %i sources\n", fn.__name__, len(profile_results), len(call_counts))
for caller in sorted(list(call_counts.keys()), key=lambda c: len(call_counts[c]), reverse=True):
call_info = call_counts[caller]
times = [r[2] for r in call_info]
own_time = sum(times)
times.sort()
longest = 0 if not times else times[-1]
shortest = 0 if not times else times[0]
log.info(
"%i successes and %i failures\nlongest %f, shortest %f, avg %f\ncaller:\n%s",
len([r for r in call_info if r[3]]),
len([r for r in call_info if not r[3]]),
longest, shortest, own_time / float(len(call_info)), caller
)
def profiled_deferred(self, reactor=None):
if not reactor:
from twisted.internet import reactor
def _cb(result, fn, start, caller_info):
if isinstance(result, (Failure, Exception)):
error = result
result = None
else:
error = None
self.add_result(fn, start, reactor.seconds(), caller_info, error is None)
if error is None:
return result
raise error
def _profiled_deferred(fn):
reactor.addSystemEventTrigger("after", "shutdown", self.show_profile_results, fn)
self.profile_results[fn] = []
@functools.wraps(fn)
def _wrapper(*args, **kwargs):
caller_info = "".join(traceback.format_list(traceback.extract_stack()[-3:-1]))
start = reactor.seconds()
d = defer.maybeDeferred(fn, *args, **kwargs)
d.addBoth(_cb, fn, start, caller_info)
return d
return _wrapper
return _profiled_deferred
_profiler = DeferredProfiler()
profile_deferred = _profiler.profiled_deferred