Created
February 5, 2020 03:30
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Content Addressable Python! (work in progress)
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| import dill | |
| x = 1 | |
| def print_globals(max_value_len=79): | |
| """ | |
| >>> print_globals(40) # doctest: +ELLIPSIS | |
| globals: { | |
| ... | |
| '__doc__': ... | |
| '__package__': ... | |
| '__loader__': <_frozen_importlib_e…ject at 0x...> | |
| '__spec__': ModuleSpec(name='...') | |
| '__file__': '...' | |
| '__cached__': '...' | |
| '__builtins__': {'__name__': 'builti… object., '_': None} | |
| ... | |
| 'print_globals': <function print_globals at 0x...> | |
| ... | |
| } | |
| """ | |
| print('globals: {') | |
| for k, v in globals().items(): | |
| r = repr(v) | |
| if len(r) > max_value_len: | |
| half = int(max_value_len / 2) | |
| r = r[:half] + '…' + r[-half:] | |
| print(f" {k!r}: {r}") | |
| print('}') | |
| def stuff(): | |
| global x | |
| x += 1 | |
| print(f"x is now {x}") | |
| if __name__ == '__main__': | |
| import os | |
| from hashlib import sha256 | |
| # with open(__file__) as f: | |
| # code = f.read() | |
| # bytecode = compile(code, '__main__', 'exec') | |
| # bytecode_hash = sha256(bytecode.co_code).hexdigest() | |
| with open(__file__, 'rb') as f: | |
| code = f.read() | |
| code_hash = sha256(code).hexdigest() | |
| import sys | |
| _, *args = sys.argv | |
| try: | |
| start_from, = args | |
| except ValueError: | |
| start_from = None | |
| if start_from is None: | |
| print(f"Starting fresh session for {code_hash}") | |
| try: | |
| os.makedirs(f'sessions/{code_hash}') | |
| except FileExistsError: | |
| pass | |
| else: | |
| with open(f'sessions/{code_hash}/code.py', 'wb') as f: | |
| f.write(code) | |
| else: | |
| print(f"Loading session {start_from!r}") | |
| dill.load_session(f'sessions/{code_hash}/{start_from}.pkl') | |
| print_globals() | |
| print(f"Doing stuff") | |
| stuff() | |
| print(f"Done doing stuff") | |
| print_globals() | |
| temp_path = f'sessions/{code_hash}/tmp.pkl' | |
| dill.dump_session(temp_path) | |
| with open(temp_path, 'rb') as f: | |
| state_hash = sha256(f.read()).hexdigest() | |
| new_path = f'sessions/{code_hash}/{state_hash}.pkl' | |
| os.rename(temp_path, new_path) | |
| prev_path = f'sessions/{code_hash}/prev.pkl' | |
| try: | |
| os.remove(prev_path) | |
| except FileNotFoundError: | |
| pass | |
| os.link(new_path, prev_path) | |
| print(f"Saved state {state_hash}") |
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