The scrap-is-not-scrap (sins) experiment began out of a public school education in biology and dissatisfaction with genetic algorithms with their ability to do work.
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#!/usr/bin/env python3
from datetime import datetime
from hashlib import sha1
from pathlib import Path
from sqlalchemy import LargeBinary, Column, ForeignKey, Integer, String, DateTime, create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import Session, relationship, backref
from sqlalchemy.orm.collections import attribute_mapped_collection
now = '{0:%Y%m%dT%H%M%S}'.format(datetime.utcnow())
Base = declarative_base()
def db_config(path: Path) -> Session:
engine = create_engine(f'sqlite:///{path.resolve()}', native_datetime=True)
Base.metadata.create_all(engine)
session = Session(engine)
return session
class ScrapNode(Base):
__tablename__ = 'scrap_node'
ctime = Column(DateTime, default=datetime.utcnow)
id = Column(Integer, primary_key=True)
length = Column(Integer, default=0)
mtime = Column(DateTime, onupdate=datetime.utcnow)
parent_id = Column(Integer, ForeignKey(id))
checksum = Column(String)
objdump = Column(String)
image = Column(LargeBinary)
children = relationship(
"ScrapNode",
cascade="all, delete-orphan",
backref=backref("parent", remote_side=id),
collection_class=attribute_mapped_collection('name'))
def __init__(self, *, child: bytes, parent_id: int = None):
self.parent_id = parent_id
self.image = child
self.length = len(child)
self.sha1sum
def __repr__(self):
values = {
'checksum': self.checksum,
'length': self.length,
'parent_id': self.parent_id,
'id': self.id,
}
return f'{values}\n{self.objdump}'
@property
def sha1sum(self):
if self.checksum:
return self.checksum
checksum = sha1()
checksum.update(self.image)
self.checksum = checksum.hexdigest()
return self.checksum