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171 lines
6.8 KiB
171 lines
6.8 KiB
from copy import deepcopy
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from .lnutil import SENT, RECEIVED, LOCAL, REMOTE, HTLCOwner, UpdateAddHtlc, Direction
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from .util import bh2u
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class HTLCManager:
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def __init__(self, local_ctn=0, remote_ctn=0, log=None):
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self.ctn = {LOCAL:local_ctn, REMOTE: remote_ctn}
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self.expect_sig = {SENT: False, RECEIVED: False}
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if log is None:
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initial = {'adds': {}, 'locked_in': {}, 'settles': {}, 'fails': {}}
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log = {LOCAL: deepcopy(initial), REMOTE: deepcopy(initial)}
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else:
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assert type(log) is dict
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log = {HTLCOwner(int(x)): y for x, y in deepcopy(log).items()}
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# self.ctn[sub] is the ctn for the oldest unrevoked ctx of sub
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for sub in (LOCAL, REMOTE):
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log[sub]['adds'] = {int(x): UpdateAddHtlc(*y) for x, y in log[sub]['adds'].items()}
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coerceHtlcOwner2IntMap = lambda x: {HTLCOwner(int(y)): z for y, z in x.items()}
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# "side who offered htlc" -> action -> htlc_id -> whose ctx -> ctn
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log[sub]['locked_in'] = {int(x): coerceHtlcOwner2IntMap(y) for x, y in log[sub]['locked_in'].items()}
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log[sub]['settles'] = {int(x): coerceHtlcOwner2IntMap(y) for x, y in log[sub]['settles'].items()}
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# FIXME "fails" should be handled like "settles"
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log[sub]['fails'] = {int(x): y for x, y in log[sub]['fails'].items()}
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self.log = log
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def to_save(self):
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x = deepcopy(self.log)
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for sub in (LOCAL, REMOTE):
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d = {}
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for htlc_id, htlc in x[sub]['adds'].items():
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d[htlc_id] = (htlc[0], bh2u(htlc[1])) + htlc[2:]
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x[sub]['adds'] = d
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return x
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def send_htlc(self, htlc):
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htlc_id = htlc.htlc_id
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adds = self.log[LOCAL]['adds']
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assert type(adds) is not str
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adds[htlc_id] = htlc
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self.log[LOCAL]['locked_in'][htlc_id] = {LOCAL: None, REMOTE: self.ctn[REMOTE]+1}
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self.expect_sig[SENT] = True
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return htlc
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def recv_htlc(self, htlc):
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htlc_id = htlc.htlc_id
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self.log[REMOTE]['adds'][htlc_id] = htlc
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l = self.log[REMOTE]['locked_in'][htlc_id] = {LOCAL: self.ctn[LOCAL]+1, REMOTE: None}
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self.expect_sig[RECEIVED] = True
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def send_ctx(self):
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next_ctn = self.ctn[REMOTE] + 1
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for locked_in in self.log[REMOTE]['locked_in'].values():
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if locked_in[REMOTE] is None:
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locked_in[REMOTE] = next_ctn
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self.expect_sig[SENT] = False
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def recv_ctx(self):
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next_ctn = self.ctn[LOCAL] + 1
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for locked_in in self.log[LOCAL]['locked_in'].values():
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if locked_in[LOCAL] is None:
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locked_in[LOCAL] = next_ctn
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self.expect_sig[RECEIVED] = False
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def send_rev(self):
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self.ctn[LOCAL] += 1
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for htlc_id, ctns in self.log[LOCAL]['settles'].items():
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if ctns[REMOTE] is None:
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ctns[REMOTE] = self.ctn[REMOTE] + 1
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def recv_rev(self):
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self.ctn[REMOTE] += 1
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did_set_htlc_height = False
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for htlc_id, ctns in self.log[LOCAL]['locked_in'].items():
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if ctns[LOCAL] is None:
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did_set_htlc_height = True
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assert ctns[REMOTE] == self.ctn[REMOTE]
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ctns[LOCAL] = self.ctn[LOCAL] + 1
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for htlc_id, ctns in self.log[REMOTE]['settles'].items():
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if ctns[LOCAL] is None:
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ctns[LOCAL] = self.ctn[LOCAL] + 1
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return did_set_htlc_height
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def htlcs_by_direction(self, subject, direction, ctn=None):
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"""
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direction is relative to subject!
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"""
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assert type(subject) is HTLCOwner
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assert type(direction) is Direction
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if ctn is None:
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ctn = self.ctn[subject]
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l = []
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if direction == SENT and subject == LOCAL:
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party = LOCAL
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elif direction == RECEIVED and subject == REMOTE:
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party = LOCAL
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else:
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party = REMOTE
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for htlc_id, ctns in self.log[party]['locked_in'].items():
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htlc_height = ctns[subject]
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if htlc_height is None:
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expect_sig = self.expect_sig[RECEIVED if party != LOCAL else SENT]
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include = not expect_sig and ctns[-subject] <= ctn
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else:
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include = htlc_height <= ctn
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if include:
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settles = self.log[party]['settles']
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if htlc_id not in settles or settles[htlc_id][subject] is None or settles[htlc_id][subject] > ctn:
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fails = self.log[party]['fails']
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if htlc_id not in fails or fails[htlc_id] > ctn:
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l.append(self.log[party]['adds'][htlc_id])
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return l
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def htlcs(self, subject, ctn=None):
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assert type(subject) is HTLCOwner
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if ctn is None:
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ctn = self.ctn[subject]
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l = []
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l += [(SENT, x) for x in self.htlcs_by_direction(subject, SENT, ctn)]
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l += [(RECEIVED, x) for x in self.htlcs_by_direction(subject, RECEIVED, ctn)]
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return l
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def current_htlcs(self, subject):
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assert type(subject) is HTLCOwner
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ctn = self.ctn[subject]
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return self.htlcs(subject, ctn)
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def pending_htlcs(self, subject):
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assert type(subject) is HTLCOwner
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ctn = self.ctn[subject] + 1
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return self.htlcs(subject, ctn)
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def send_settle(self, htlc_id):
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self.log[REMOTE]['settles'][htlc_id] = {LOCAL: None, REMOTE: self.ctn[REMOTE] + 1}
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def recv_settle(self, htlc_id):
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self.log[LOCAL]['settles'][htlc_id] = {LOCAL: self.ctn[LOCAL] + 1, REMOTE: None}
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def settled_htlcs_by(self, subject, ctn=None):
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assert type(subject) is HTLCOwner
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if ctn is None:
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ctn = self.ctn[subject]
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d = []
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for htlc_id, ctns in self.log[subject]['settles'].items():
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if ctns[subject] <= ctn:
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d.append(self.log[subject]['adds'][htlc_id])
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return d
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def settled_htlcs(self, subject, ctn=None):
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assert type(subject) is HTLCOwner
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if ctn is None:
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ctn = self.ctn[subject]
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sent = [(SENT, x) for x in self.settled_htlcs_by(subject, ctn)]
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other = subject.inverted()
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received = [(RECEIVED, x) for x in self.settled_htlcs_by(other, ctn)]
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return sent + received
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def received_in_ctn(self, ctn):
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return [self.log[REMOTE]['adds'][htlc_id]
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for htlc_id, ctns in self.log[REMOTE]['settles'].items()
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if ctns[LOCAL] == ctn]
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def sent_in_ctn(self, ctn):
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return [self.log[LOCAL]['adds'][htlc_id]
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for htlc_id, ctns in self.log[LOCAL]['settles'].items()
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if ctns[LOCAL] == ctn]
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def send_fail(self, htlc_id):
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self.log[REMOTE]['fails'][htlc_id] = self.ctn[REMOTE] + 1
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def recv_fail(self, htlc_id):
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self.log[LOCAL]['fails'][htlc_id] = self.ctn[LOCAL] + 1
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