220 lines
5.5 KiB
Python
220 lines
5.5 KiB
Python
from nullptr.models import *
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from os.path import isfile, dirname, isdir
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import os
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from os.path import basename
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import json
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from .util import *
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from time import time
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import pickle
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from struct import unpack, pack
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class ChunkHeader:
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def __init__(self):
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self.in_use = True
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self.size = 0
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self.used = 0
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@classmethod
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def parse(cls, fil):
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d = fil.read(16)
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if len(d) < 16:
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return None
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# print(d)
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o = cls()
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d, o.used = unpack('<QQ', d)
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o.size = d & 0x7fffffffffffffff
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o.in_use = d & 0x8000000000000000 != 0
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# print(o)
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return o
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def write(self, f):
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d = self.size
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if self.in_use:
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d |= 1 << 63
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d = pack('<QQ', d, self.used)
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f.write(d)
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def __repr__(self):
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return f'chunk {self.in_use} {self.size} {self.used}'
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class Store:
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def __init__(self, data_file):
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self.init_models()
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self.fil = open_file(data_file)
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self.data = {m: {} for m in self.models}
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self.system_members = {}
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self.dirty_objects = set()
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self.cleanup_interval = 600
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self.last_cleanup = 0
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self.slack = 0.1
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self.slack_min = 64
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self.slack_max = 1024
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self.load()
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def init_models(self):
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self.models = all_subclasses(Base)
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self.extensions = {c.ext(): c for c in self.models}
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self.model_names = {c.__name__: c for c in self.models}
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def dirty(self, obj):
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self.dirty_objects.add(obj)
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def dump_object(self, obj):
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return pickle.dumps(obj)
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def load_object(self, data, offset):
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obj = pickle.loads(data)
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obj.file_offset = offset
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obj.disable_dirty = False
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self.hold(obj)
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def load(self):
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cnt = 0
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start_time = time()
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self.fil.seek(0)
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offset = 0
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while (hdr := ChunkHeader.parse(self.fil)):
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if not hdr.in_use: continue
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data = self.fil.read(hdr.used)
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self.load_object(data, offset)
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self.fil.seek(hdr.size - hdr.used, 1)
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offset = self.fil.tell()
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cnt += 1
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dur = time() - start_time
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print(f'loaded {cnt} objects in {dur:.2f} seconds')
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def allocate_chunk(self, sz):
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used = sz
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slack = sz * self.slack
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slack = min(slack, self.slack_max)
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slack = max(slack, self.slack_min)
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sz += slack
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self.fil.seek(0, 2)
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offset = self.fil.tell()
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h = ChunkHeader()
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h.size = sz
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h.used = used
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h.write(self.fil)
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return offset, h
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def store(self, obj):
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data = self.dump_object(obj)
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osize = len(data)
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# is there an existing chunk for this obj?
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if obj.file_offset > 0:
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# read chunk hdr
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self.fil.seek(obj.file_offset)
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hdr = ChunkHeader.parse(self.fil)
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csize = hdr.size
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# if the chunk is too small
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if csize < osize:
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# free the chunk
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hdr.in_use = False
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# force a new chunk
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obj.file_offset = 0
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else:
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# if it is big enough, update the used field
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hdr.used = osize
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self.fil.seek(obj.file_offset)
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hdr.write(self.fil)
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if obj.file_offset == 0:
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obj.file_offset, hdr = self.allocate_chunk(osize)
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self.fil.write(data)
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slack = b'\x00' * (hdr.size - hdr.used)
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self.fil.write(slack)
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def hold(self, obj):
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typ = type(obj)
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symbol = obj.symbol
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obj.store = self
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self.data[typ][symbol] = obj
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if hasattr(typ, 'system'):
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system_str = obj.system.symbol
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if system_str not in self.system_members:
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self.system_members[system_str] = set()
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self.system_members[system_str].add(obj)
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def create(self, typ, symbol):
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obj = typ(symbol, self)
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self.hold(obj)
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self.dirty(obj)
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return obj
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def get(self, typ, symbol, create=False):
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if type(typ) == str and typ in self.model_names:
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typ = self.model_names[typ]
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symbol = symbol.upper()
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if typ not in self.data:
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return None
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if symbol not in self.data[typ]:
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if create:
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return self.create(typ, symbol)
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else:
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return None
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return self.data[typ][symbol]
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def update(self, typ, data, symbol=None):
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if type(typ) == str and typ in self.model_names:
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typ = self.model_names[typ]
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if symbol is None:
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symbol = mg(data, typ.identifier)
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obj = self.get(typ, symbol, True)
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obj.update(data)
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return obj
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def update_list(self, typ, lst):
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return [self.update(typ, d) for d in lst]
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def all(self, typ):
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if type(typ) == str and typ in self.model_names:
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typ = self.model_names[typ]
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for m in self.data[typ].values():
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yield m
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def all_members(self, system, typ=None):
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if type(typ) == str and typ in self.model_names:
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typ = self.model_names[typ]
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if type(system) == System:
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system = system.symbol
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if 'system' not in self.system_members:
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return
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print('typ', typ)
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for m in self.system_members[system]:
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if typ is None or type(m) == typ:
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yield m
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def cleanup(self):
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if time() < self.last_cleanup + self.cleanup_interval:
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return
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start_time = time()
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expired = list()
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for t in self.data:
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for o in self.all(t):
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if o.is_expired():
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expired.append(o)
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for o in expired:
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# TODO
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del self.data[type(o)][o.symbol]
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dur = time() - start_time
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# print(f'cleaned {len(expired)} in {dur:.03f} seconds')
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def flush(self):
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self.cleanup()
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it = 0
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start_time = time()
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for obj in self.dirty_objects:
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it += 1
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self.store(obj)
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self.fil.flush()
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self.dirty_objects = set()
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dur = time() - start_time
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# print(f'flush done {it} items {dur:.2f}')
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