def xml_unicode_to_pns (e):
"XML/PNS - serialize a UNICODEd XML element as 8-bit byte strings"
if e.xml_attributes:
yield netstring.encode ((
netstring.encode ((
key.encode ('utf-8'), val.encode ('utf-8')
))
for key, val in e.xml_attributes.items ()
))
else:
yield ''
yield e.xml_first.encode ('utf-8')
if e.xml_children:
yield netstring.encode ((
netstring.encode ((
child.pns_name,
child.xml_name.encode ('utf-8')
))
for child in e.xml_children
))
else:
yield ''
if e.xml_follow:
yield e.xml_follow.encode ('utf-8')
else:
yield ''
def articulate_re(text, articulate, articulators, depth=0):
"Articulate text using a simple regular expression lexer"
bottom = len(articulators)
# move down the stack until a pattern is matched ...
while True:
texts = [t for t in articulators[depth].split(text) if t]
depth += 1
if len(texts) > 1:
break
if depth == bottom:
# no match found, bottom of the stack reached.
return text
field = set()
if depth == bottom:
# bottom of the stack reached, simply split
name = pns_model.pns_name(netstring.encode(texts), field)
else:
# not yet at the bottom of the stack, recurse ...
name = pns_model.pns_name(
netstring.encode((articulate_re(t, articulate, articulators, depth) for t in texts)), field
)
# validate the articulated name(s) as a Public Names
if len(field) > 1:
articulate((len(field), field, name, text))
return name
def xml_unicode_to_pns(e):
"XML/PNS - serialize a UNICODEd XML element as 8-bit byte strings"
if e.xml_attributes:
yield netstring.encode((netstring.encode(
(key.encode('utf-8'), val.encode('utf-8')))
for key, val in e.xml_attributes.items()))
else:
yield ''
yield e.xml_first.encode('utf-8')
if e.xml_children:
yield netstring.encode((netstring.encode(
(child.pns_name, child.xml_name.encode('utf-8')))
for child in e.xml_children))
else:
yield ''
if e.xml_follow:
yield e.xml_follow.encode('utf-8')
else:
yield ''
def compact_traceback (ctb):
"encode a compact traceback tuple as netstrings"
return netstring.encode ((
ctb[0],
netstring.encode ([' | '.join (x) for x in ctb[2]]),
ctb[1]
)), 'traceback'
def log_statement(model):
"Log valid statement to STDOUT, errors to STDERR"
model, error = pns_model.pns_triple(model)
if error:
loginfo.log(netstring.encode(model), error)
return False
loginfo.log(netstring.encode(model))
return True
def log_statement (model):
"Log valid statement to STDOUT, errors to STDERR"
model, error = pns_model.pns_triple (model)
if error:
loginfo.log (netstring.encode (model), error)
return False
loginfo.log (netstring.encode (model))
return True
def classic_traceback (ctb=None):
return netstring.encode ((
netstring.encode ([
'File "%s", line %s, in %s' % (
tb[0] or '<string>', tb[2], tb[1]
)
for tb in ctb[2]
]), '%s: %s' % ctb[:2]
)), 'Traceback (most recent call last):'
def resolved (request):
model = list (request.dns_question)
if request.dns_resources == None:
model.append ('')
elif len (request.dns_resources) > 1:
model.append (netstring.encode (
request.dns_resources
))
elif request.dns_resources:
model.append (request.dns_resources[0])
else:
model.append ('')
model.append (request.dns_peer[0])
loginfo.log (netstring.encode (model))
def __repr__(self):
"return a safe netstring representation of the deque"
r = []
try:
self.cv.acquire()
l = len(self.deque)
for item in self.deque:
try:
r.append('%r' % (item, ))
except:
r.append('item id="%x"' % id(item))
finally:
self.cv.release()
return netstring.encode(
('protected_deque queued="%d"' % l, netstring.encode(r)))
def pns_signal (self, resolved, model):
"the default resolution handler"
assert None == self.log (netstring.encode (model))
if model[4] == '_' or model[4].startswith ('.'):
return False
return True
def pns_command (self, model):
# handle a command from a PNS/TCP session
assert None == self.log (
netstring.encode (model), 'command'
)
if model[1]:
if model[2]:
# walk subject down to contexts, let the user
# agent walk the graph up and down at once to
# test and weight a subject against a set of
# contexts (and not implement that common walk
# into the client, but rather articulate it).
#
contexts = set (netunicode.decode (
unicode (model[2], 'UTF-8')
))
self.thread_loop_queue ((
self.pns_walk_simplest,
(model, contexts)
))
return
# walk down the contexts once, in all contexts
self.thread_loop_queue ((
self.pns_command_predicate, (model,)
))
return
# walk up the names once, for in contexts
self.thread_loop_queue ((
self.pns_command_object, (model,)
))
def articulate_chunk(text, articulate, articulators, CHUNK, depth=0):
"Articulate in chunks, usefull for larger text articulations"
bottom = len(articulators)
# move down the stack until a pattern is matched ...
while True:
texts = [t for t in articulators[depth].split(text) if t]
depth += 1
if len(texts) > 1:
break
if depth == bottom:
# no match found, bottom of the stack reached, this
# is supposed to chunk, not articulate, do not name
# because it is inarticulated junk ...
return ""
if depth == bottom:
# bottom of the stack reached, simply split do not articulate
# any further, there is nothing to chunk and it is a flat
# articulation ...
return pns_model.pns_name(netstring.encode((t for t in texts if len(t) <= CHUNK)), set())
# not yet at the bottom of the stack, recurse
for t in texts:
if len(t) > CHUNK:
articulate_chunk(t, articulate, articulators, CHUNK, depth)
else:
articulate_re(t, articulate, articulators, depth)
return None
def pns_join(self, context, ip, handler):
"join a context at ip and subscribe the handler to its log"
if self.pns_subscribed.has_key(context):
self.pns_subscribed[context].append(handler)
else:
self.pns_subscribed[context] = [handler]
self.pns_send(netstring.encode((context, '', ip, context)))
def pns_subscribe(self, context, handler):
"subscribe to a context and log its statements"
if self.pns_subscribed.has_key(context):
self.pns_subscribed[context].append(handler)
else:
self.pns_subscribed[context] = [handler]
self.pns_send(netstring.encode((context, '', '', context)))
def pns_quit(self, context, handler):
"quit a context, unsubscribe to its log"
if self.pns_subscribed.has_key(context):
self.pns_subscribed[context].remove(handler)
if len(self.pns_subscribed[context]) == 0:
del self.pns_subscribed[context]
self.pns_send(netstring.encode(('', '', '', context)))
def pns_signal(self, resolved, model):
"the default resolution handler"
assert None == self.log(netstring.encode(model))
if model[4] == '_' or model[4].startswith('.'):
return False
return True
def pns_walk_simple(self, model, contexts, walked, routes, names):
assert None == self.select_trigger_log(
'<walk-simple horizon="%d" walked="%d"/>'
'<![CDATA[%s]]!>' %
(len(names), len(walked), netstring.encode(model)), 'debug')
for name in names:
if name in walked:
continue
walked.add(name)
if name in contexts:
routes.setdefault(name, set()).add(name)
paths = self.pns_walk_down(name, contexts)
if paths:
routes.setdefault(name, set()).update(paths)
if len(walked) >= self.pns_horizon:
# horizon reached, walk out
self.pns_walk_out(model, routes)
return
names = self.pns_walk_up(names, walked)
if len(names) == 0:
# no more index to walk, walk out
self.pns_walk_out(model, routes)
return
names = [r[1] for r in pns_weight_names(names)]
self.thread_loop_queue(
(self.pns_walk_simple, (model, contexts, walked, routes,
names))) # >>> do another simple step
def pns_statement(model):
model, error = pns_model.pns_triple(model)
if error:
loginfo.log(netstring.encode(model), error)
return False
channel.pns_statement(tuple(model[:3]), model[3])
return True
def pns_anonymous (self, model):
# anonymous question, resolve in all contexts.
sp = netstring.encode (model[:2])
stored = self.pns_statements.get (sp)
if stored != None:
bounce = model[:5]
bounce[2] = netstring.encode ([
netstring.encode (i)
for i in cPickle.loads (stored).items ()
])
self.select_trigger ((
self.pns_peer.pns_tcp_continue,
(bounce, '_')
))
self.select_trigger ((
self.pns_peer.pns_tcp_continue, (model, '.')
))
def xml_utf8_name (element, dom):
# articulate a context's name one from its children's name(s)
field = set ()
return pns_model.pns_name (netstring.encode ((
child.pns_name
for child in element.xml_children
if child.pns_name
)), field)
def xml_utf8_to_pns(e):
"XML/PNS - articulate an UTF-8 XML element as 8-bit byte strings"
if e.xml_attributes:
yield netstring.encode(
(netstring.encode(item) for item in e.xml_attributes.items()))
else:
yield ''
yield e.xml_first
if e.xml_children:
yield netstring.encode((netstring.encode(
(child.pns_name, child.xml_name)) for child in e.xml_children))
else:
yield ''
yield e.xml_follow or ''
def xml_to_pns_continue(self, resolved, model):
# handle all XML to PNS responses,
assert None == loginfo.log(netstring.encode(model))
if self.pns_resolved == resolved:
pass
# this is the end, at least if the PNS peer does
# handle each of the statement in sequence, not
# answering the last one before the others.
return False
def xml_to_pns_continue (self, resolved, model):
# handle all XML to PNS responses,
assert None == loginfo.log (netstring.encode (model))
if self.pns_resolved == resolved:
pass
# this is the end, at least if the PNS peer does
# handle each of the statement in sequence, not
# answering the last one before the others.
return False
def pns_walk_out(self, model, routes):
# continue the commands, drop the statements
routes = pns_weight_routes(routes)
assert None == self.select_trigger_log(
'<walk-out routes="%d"/>'
'<![CDATA[%s]]!><![CDATA[%s]]!>' %
(len(routes), netstring.encode(model),
encode(netunicode.encode([r[1] for r in routes]), 'UTF-8')), '')
self.select_trigger((self.pns_walk_continue, (model, routes)))
def pns_quit (self, context, handler):
"quit a context, unsubscribe to its log"
if self.pns_subscribed.has_key (context):
self.pns_subscribed[context].remove (handler)
if len (self.pns_subscribed[context]) == 0:
del self.pns_subscribed[context]
self.pns_send (netstring.encode ((
'', '', '', context
)))
def pns_join (self, context, ip, handler):
"join a context at ip and subscribe the handler to its log"
if self.pns_subscribed.has_key (context):
self.pns_subscribed[context].append (handler)
else:
self.pns_subscribed[context] = [handler]
self.pns_send (netstring.encode ((
context, '', ip, context
)))
def pns_subscribe (self, context, handler):
"subscribe to a context and log its statements"
if self.pns_subscribed.has_key (context):
self.pns_subscribed[context].append (handler)
else:
self.pns_subscribed[context] = [handler]
self.pns_send (netstring.encode ((
context, '', '', context
)))
def pns_statement (model):
model, error = pns_model.pns_triple (model)
if error:
loginfo.log (netstring.encode (model), error)
return False
channel.pns_statement (
tuple (model[:3]), model[3]
)
return True
def xml_utf8_root (element, dom):
xml_utf8_context (element, dom)
dom.pns_statement ((
element.pns_name or dom.pns_name,
element.xml_name,
netstring.encode (
xml_utf8_to_pns (element)
),
dom.pns_name
))
def __repr__ (self):
"return a safe netstring representation of the deque"
r = []
try:
self.cv.acquire ()
l = len (self.deque)
for item in self.deque:
try:
r.append ('%r' % (item,))
except:
r.append (
'item id="%x"' % id (item)
)
finally:
self.cv.release ()
return netstring.encode ((
'protected_deque queued="%d"' % l,
netstring.encode (r)
))
def loginfo_netlines(self, data, info=None):
"log netoutlines to STDOUT, a category handler or STDERR"
assert type(data) == str
if info == None:
self.loginfo_stdout(netstring.netlines(data))
elif self.loginfo_categories.has_key(info):
self.loginfo_categories[info](netstring.netlines(data))
else:
assert type(info) == str
self.loginfo_stderr(
netstring.netlines(netstring.encode((info, data))))
def loginfo_netstrings(self, data, info=None):
"log netstrings to STDOUT, a category handler or STDERR"
assert type(data) == str
if info == None:
self.loginfo_stdout('%d:%s,' % (len(data), data))
elif self.loginfo_categories.has_key(info):
self.loginfo_categories[info]('%d:%s,' % (len(data), data))
else:
assert type(info) == str
encoded = netstring.encode((info, data))
self.loginfo_stderr('%d:%s,' % (len(encoded), encoded))
def pns_signal (self, resolved, model):
# dump a netstring to STDOUT
loginfo.log (netstring.encode (model))
# waits for the echo to finalize and articulate the
# next statement, nicely as the peer sends its echo
if model[4].startswith ('.'):
self.pns_articulate ()
return False
# _, ! or ? are simply dropped unless they occur
# before ., ...
return True
def pns_signal(self, resolved, model):
# dump a netstring to STDOUT
loginfo.log(netstring.encode(model))
# waits for the echo to finalize and articulate the
# next statement, nicely as the peer sends its echo
if model[4].startswith('.'):
self.pns_articulate()
return False
# _, ! or ? are simply dropped unless they occur
# before ., ...
return True
def pns_resolve (self, model):
# store, retrieve and update, but also filter statements,
# returns a tuple (persistent, stored), indicating wether
# the statement is to be blocked and the object stored
# previously if any.
#
sp = netstring.encode (model[:2])
stored = self.pns_statements.get (sp)
if stored == None:
# new (subject, predicate): log, store and pass
assert None == self.select_trigger_log (
netstring.encode (model), 'new'
)
self.pns_log (model)
self.pns_statements [sp] = cPickle.dumps (
{model[3]: model[2]}
)
return True, None
# load the {(object, context)} hash from the store
persistents = cPickle.loads (stored)
o = persistents.get (model[3])
if o == model[2]:
# redundant contextual statement: block
assert None == self.select_trigger_log (
netstring.encode (model), 'block'
)
return False, None
if model[2] != '':
# dissent: log, update answer and pass
assert None == self.select_trigger_log (
netstring.encode (model), 'update'
)
self.pns_log (model)
persistents[model[3]] = model[2]
self.pns_statements[sp] = cPickle.dumps (persistents)
return True, o
def pns_resolve (self, model, context, handler, handlers):
"resolve a command or statement"
handlers.append (handler or self.pns_signal)
if len (handlers) == 1:
# send the statement if it is not redundant
encoded = netstring.encode (model)
if context:
encoded += '%d:%s,' % (len (context), context)
else:
encoded += '0:,'
self.pns_send (encoded)
return True
return False
def http_continue (self, http):
uri = http.request[1]
try:
uri = list (HTTP_URI.match (uri).groups ())
except:
uri = ['http://', http.collector_headers.get (
'host', self.presto_path
), uri, '', '']
else:
uri[0] = uri[0] or 'http://'
uri[1] = uri[1] or http.collector_headers.get (
'host', self.presto_path
)
http.uri = uri
about = uri[2].split ('/', 2)
about[0] = uri[1]
about = http.uri_about = tuple ((
unicode (urldecode (n), 'UTF-8') for n in about
))
try:
# context, subject and maybe predicate
# || http://host/folder || http://host/folder/file
controller = self.presto_cached[about]
except:
if len (about) > 2:
about = (about[0], about[1])
else:
about = (about[0],)
try:
# context and subject || http://host/folder
controller = self.presto_cached[about]
except:
controller = http_404_close
try:
stalled = controller (http, about)
except:
self.loginfo_traceback ()
http (500)
stalled = False
try:
digest = http.irtd2[4]
except:
digest = '%x' % id (http)
loginfo.log (str (netstring.encode ((
' '.join (http.request),
''.join (uri[:3]),
digest
))), '%d' % http.response)
return stalled
def loginfo_netlines (self, data, info=None):
"log netoutlines to STDOUT, a category handler or STDERR"
assert type (data) == str
if info == None:
self.loginfo_stdout (netstring.netlines (data))
elif self.loginfo_categories.has_key (info):
self.loginfo_categories[info] (
netstring.netlines (data)
)
else:
assert type (info) == str
self.loginfo_stderr (netstring.netlines (
netstring.encode ((info, data))
))
def pns_resolve(self, model, context, handler, handlers):
"resolve a command or statement"
handlers.append(handler or self.pns_signal)
if len(handlers) == 1:
# send the statement if it is not redundant
encoded = netstring.encode(model)
if context:
encoded += '%d:%s,' % (len(context), context)
else:
encoded += '0:,'
self.pns_send(encoded)
return True
return False
def http_continue(self, http):
uri = http.request[1]
try:
uri = list(HTTP_URI.match(uri).groups())
except:
uri = [
'http://',
http.collector_headers.get('host', self.presto_path), uri, '',
''
]
else:
uri[0] = uri[0] or 'http://'
uri[1] = uri[1] or http.collector_headers.get(
'host', self.presto_path)
http.uri = uri
about = uri[2].split('/', 2)
about[0] = uri[1]
about = http.uri_about = tuple(
(unicode(urldecode(n), 'UTF-8') for n in about))
try:
# context, subject and maybe predicate
# || http://host/folder || http://host/folder/file
controller = self.presto_cached[about]
except:
if len(about) > 2:
about = (about[0], about[1])
else:
about = (about[0], )
try:
# context and subject || http://host/folder
controller = self.presto_cached[about]
except:
controller = http_404_close
try:
stalled = controller(http, about)
except:
self.loginfo_traceback()
http(500)
stalled = False
try:
digest = http.irtd2[4]
except:
digest = '%x' % id(http)
loginfo.log(
str(
netstring.encode(
(' '.join(http.request), ''.join(uri[:3]), digest))),
'%d' % http.response)
return stalled
def loginfo_netstrings (self, data, info=None):
"log netstrings to STDOUT, a category handler or STDERR"
assert type (data) == str
if info == None:
self.loginfo_stdout ('%d:%s,' % (len (data), data))
elif self.loginfo_categories.has_key (info):
self.loginfo_categories[info] (
'%d:%s,' % (len (data), data)
)
else:
assert type (info) == str
encoded = netstring.encode ((info, data))
self.loginfo_stderr (
'%d:%s,' % (len (encoded), encoded)
)
def xml_utf8_to_pns (e):
"XML/PNS - articulate an UTF-8 XML element as 8-bit byte strings"
if e.xml_attributes:
yield netstring.encode ((
netstring.encode (item)
for item in e.xml_attributes.items ()
))
else:
yield ''
yield e.xml_first
if e.xml_children:
yield netstring.encode ((
netstring.encode ((
child.pns_name, child.xml_name
))
for child in e.xml_children
))
else:
yield ''
yield e.xml_follow or ''
def xml_unicode_to_pns(self, element, context):
try:
pns = element.xml_attributes.pop(u'pns')
except:
element.pns_name = ''
subject = context
else:
element.pns_name = subject = pns.encode('utf-8')
if element.xml_children:
for child in element.xml_children:
self.xml_unicode_to_pns(child, subject)
self.pns_statement((subject, element.xml_name.encode('utf-8'),
netstring.encode(xml_unicode_to_pns(element))),
context, self.xml_to_pns_continue)
if subject != context:
element.xml_attributes[u'pns'] = pns
def pns_walk_out (self, model, routes):
# continue the commands, drop the statements
routes = pns_weight_routes (routes)
assert None == self.select_trigger_log (
'<walk-out routes="%d"/>'
'<![CDATA[%s]]!><![CDATA[%s]]!>' % (
len (routes),
netstring.encode (model),
encode (netunicode.encode (
[r[1] for r in routes]
), 'UTF-8')
), ''
)
self.select_trigger ((
self.pns_walk_continue, (model, routes)
))
def xml_utf8_to_pns (self, element, context):
try:
element.pns_name = subject = \
element.xml_attributes.pop ('pns')
except:
element.pns_name = ''
subject = context
if element.xml_children:
for child in element.xml_children:
self.xml_utf8_to_pns (child, subject)
self.pns_statement ((
subject, element.xml_name,
netstring.encode (xml_utf8_to_pns (element)),
), context, self.xml_to_pns_continue)
if subject != context:
element.xml_attributes['pns'] = subject
def xml_utf8_to_pns(self, element, context):
try:
element.pns_name = subject = \
element.xml_attributes.pop ('pns')
except:
element.pns_name = ''
subject = context
if element.xml_children:
for child in element.xml_children:
self.xml_utf8_to_pns(child, subject)
self.pns_statement((
subject,
element.xml_name,
netstring.encode(xml_utf8_to_pns(element)),
), context, self.xml_to_pns_continue)
if subject != context:
element.xml_attributes['pns'] = subject
def xml_unicode_to_pns (self, element, context):
try:
pns = element.xml_attributes.pop (u'pns')
except:
element.pns_name = ''
subject = context
else:
element.pns_name = subject = pns.encode ('utf-8')
if element.xml_children:
for child in element.xml_children:
self.xml_unicode_to_pns (child, subject)
self.pns_statement ((
subject, element.xml_name.encode ('utf-8'),
netstring.encode (xml_unicode_to_pns (element))
), context, self.xml_to_pns_continue)
if subject != context:
element.xml_attributes[u'pns'] = pns
def xml_utf8_context(element, dom):
if not element.xml_children:
return
context = element.pns_name or dom.pns_name
for child in element.xml_children:
# A PNS/XML statement with the same context and subject is a
# leaf. All other are branches, that have their parent's name
# has contexts but not as subject.
#
dom.pns_statement((child.pns_name or context, child.xml_name,
netstring.encode(xml_utf8_to_pns(child)), context))
child.xml_children = None # drop articulated children now!
# articulate the child SATs in this element's context
for articulated in child.pns_sat_articulated:
if not dom.pns_statement(
(articulated[2], 'sat', articulated[3], context)):
break
def run (self):
"""The Thread Loop
If thread_loop_init() is True call queued instance until
None is popped or and exception is raised and not catched
by thread_loop_throw. Finally, if thread_loop_delete() is
True, trunk the thread loop queue.
"""
if self.thread_loop_init ():
next = self.thread_loop_queue.popleft # ? maybe safer
while True:
queued = next () # ... sure faster
if queued == None:
break
try:
queued[0] (*queued[1])
except:
if self.thread_loop_throw ():
del queued
break
else:
del queued
#
# note that I make sure to delete the tuple which
# would otherwise hold a reference to the method and
# arguments of the call threaded, preventing garbage
# collection hence finalization and was the source
# of subtle bugs ...
#
if self.thread_loop_delete ():
trunked = self.thread_loop_queue.trunk ()
if trunked:
assert None == self.select_trigger_log (
netstring.encode ([
'%r' % (i,) for i in trunked
]), 'debug'
)
def pns_command(self, model):
# handle a command from a PNS/TCP session
assert None == self.log(netstring.encode(model), 'command')
if model[1]:
if model[2]:
# walk subject down to contexts, let the user
# agent walk the graph up and down at once to
# test and weight a subject against a set of
# contexts (and not implement that common walk
# into the client, but rather articulate it).
#
contexts = set(netunicode.decode(unicode(model[2], 'UTF-8')))
self.thread_loop_queue(
(self.pns_walk_simplest, (model, contexts)))
return
# walk down the contexts once, in all contexts
self.thread_loop_queue((self.pns_command_predicate, (model, )))
return
# walk up the names once, for in contexts
self.thread_loop_queue((self.pns_command_object, (model, )))
def xml_utf8_context (element, dom):
if not element.xml_children:
return
context = element.pns_name or dom.pns_name
for child in element.xml_children:
# A PNS/XML statement with the same context and subject is a
# leaf. All other are branches, that have their parent's name
# has contexts but not as subject.
#
dom.pns_statement ((
child.pns_name or context,
child.xml_name,
netstring.encode (xml_utf8_to_pns (child)),
context
))
child.xml_children = None # drop articulated children now!
# articulate the child SATs in this element's context
for articulated in child.pns_sat_articulated:
if not dom.pns_statement ((
articulated[2], 'sat', articulated[3], context
)):
break
def pns_name(encoded, horizon, HORIZON=126):
# Recursively validate a Public Name, returns the empty string if
# the name encoded is invalid or inside the horizon. This function
# does more than just assert that the encoded 8-bit byte string is
# a valid public name: it transform it to a valid public name.
#
# try to decode the articulated public names
names = [n for n in netstring.decode(encoded) if n]
if not names:
if encoded not in horizon and pns_name_clean(encoded):
# clean name new in this horizon
horizon.add(encoded)
return encoded
# unsafe 8-bit byte string or Public Name in the in horizon
return ''
# articulated Public Names
valid = []
for name in names:
# recursively validate each articulated name in this horizon
name = pns_name(name, horizon, HORIZON)
if name:
valid.append(name)
if len(horizon) >= HORIZON:
break # but only under this HORIZON
if len(valid) > 1:
# sort Public Names and encode
valid.sort()
return netstring.encode(valid)
if len(valid) > 0:
# return a "singleton"
return valid[0]
return '' # nothing valid to articulate in this horizon
def pns_name (encoded, horizon, HORIZON=126):
# Recursively validate a Public Name, returns the empty string if
# the name encoded is invalid or inside the horizon. This function
# does more than just assert that the encoded 8-bit byte string is
# a valid public name: it transform it to a valid public name.
#
# try to decode the articulated public names
names = [n for n in netstring.decode (encoded) if n]
if not names:
if encoded not in horizon and pns_name_clean (encoded):
# clean name new in this horizon
horizon.add (encoded)
return encoded
# unsafe 8-bit byte string or Public Name in the in horizon
return ''
# articulated Public Names
valid = []
for name in names:
# recursively validate each articulated name in this horizon
name = pns_name (name, horizon, HORIZON)
if name:
valid.append (name)
if len (horizon) >= HORIZON:
break # but only under this HORIZON
if len (valid) > 1:
# sort Public Names and encode
valid.sort ()
return netstring.encode (valid)
if len (valid) > 0:
# return a "singleton"
return valid[0]
return '' # nothing valid to articulate in this horizon
def run(self):
"""The Thread Loop
If thread_loop_init() is True call queued instance until
None is popped or and exception is raised and not catched
by thread_loop_throw. Finally, if thread_loop_delete() is
True, trunk the thread loop queue.
"""
if self.thread_loop_init():
next = self.thread_loop_queue.popleft # ? maybe safer
while True:
queued = next() # ... sure faster
if queued == None:
break
try:
queued[0](*queued[1])
except:
if self.thread_loop_throw():
del queued
break
else:
del queued
#
# note that I make sure to delete the tuple which
# would otherwise hold a reference to the method and
# arguments of the call threaded, preventing garbage
# collection hence finalization and was the source
# of subtle bugs ...
#
if self.thread_loop_delete():
trunked = self.thread_loop_queue.trunk()
if trunked:
assert None == self.select_trigger_log(
netstring.encode(['%r' % (i, ) for i in trunked]), 'debug')
def pns_statement (self, model):
# handle PNS/TCP statements either directly from persistence
# or not-relayed original statements
sp = netstring.encode (model[:2])
o = self.pns_buffer.get (sp)
if o != None:
# buffered statement, TODO: drop or buffer?
model[2] = o
return
# not buffered, echo to all subscribers, set timeout and buffer
self.pns_tcp_continue (model[:4], '.')
self.pns_peer.pns_udp.timeouts_push (
(self.pns_right or self.pns_name, sp)
)
self.pns_buffer[sp] = model[2]
if self.pns_left and self.pns_right:
# joined: record as stated, index and relay
self.pns_peer.pns_inference.pns_map (model)
self.pns_statements[sp] = model[2]
if model[2]:
# answer right
self.pns_sendto_right ('%s%d:%s,' % (
sp, len (model[2]), model[2]
), self.pns_right)
return
# question left
self.sendto (sp, (self.pns_left, 3534))
return
# not relayed
if model[3] == self.pns_name:
# route named statements that cannot be relayed
self.pns_peer.pns_inference.pns_statement (model[:4])
return
def classic_traceback(ctb=None):
return netstring.encode((netstring.encode([
'File "%s", line %s, in %s' % (tb[0] or '<string>', tb[2], tb[1])
for tb in ctb[2]
]), '%s: %s' % ctb[:2])), 'Traceback (most recent call last):'
def compact_traceback(ctb):
"encode a compact traceback tuple as netstrings"
return netstring.encode(
(ctb[0], netstring.encode([' | '.join(x)
for x in ctb[2]]), ctb[1])), 'traceback'
def loginfo_log(self, data, info=None):
"""log a message with this instance's __repr__ and an
optional category"""
self.loginfo_logger.log(netstring.encode(('%r' % self, '%s' % data)),
info)
