418 lines
15 KiB
Python
418 lines
15 KiB
Python
import json
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import logging
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import pickle
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import re
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from dataclasses import dataclass
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from pathlib import Path
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from typing import Any
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from clan_cli.cmd import run
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from clan_cli.dirs import user_cache_dir
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from clan_cli.errors import ClanError
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from clan_cli.nix import nix_build, nix_command, nix_config, nix_test_store
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log = logging.getLogger(__name__)
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class AllSelector:
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pass
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Selector = str | int | AllSelector | set[int] | set[str]
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def split_selector(selector: str) -> list[Selector]:
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"""
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takes a string and returns a list of selectors.
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a selector can be:
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- a string, which is a key in a dict
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- an integer, which is an index in a list
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- a set of strings, which are keys in a dict
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- a set of integers, which are indices in a list
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- a quoted string, which is a key in a dict
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- the string "*", which selects all elements in a list or dict
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"""
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pattern = r'"[^"]*"|[^.]+'
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matches = re.findall(pattern, selector)
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# Extract the matched groups (either quoted or unquoted parts)
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selectors: list[Selector] = []
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for selector in matches:
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if selector == "*":
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selectors.append(AllSelector())
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elif selector.isdigit():
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selectors.append({int(selector)})
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elif selector.startswith("{") and selector.endswith("}"):
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sub_selectors = set(selector[1:-1].split(","))
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selectors.append(sub_selectors)
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elif selector.startswith('"') and selector.endswith('"'):
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selectors.append(selector[1:-1])
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else:
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selectors.append(selector)
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return selectors
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@dataclass
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class FlakeCacheEntry:
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"""
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a recursive structure to store the cache, with a value and a selector
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"""
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def __init__(
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self,
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value: str | float | dict[str, Any] | list[Any],
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selectors: list[Selector],
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is_out_path: bool = False,
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) -> None:
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self.value: str | float | int | dict[str | int, FlakeCacheEntry]
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self.selector: Selector
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if selectors == []:
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self.selector = AllSelector()
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elif isinstance(selectors[0], str):
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self.selector = selectors[0]
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self.value = {self.selector: FlakeCacheEntry(value, selectors[1:])}
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return
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else:
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self.selector = selectors[0]
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if is_out_path:
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if selectors != []:
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msg = "Cannot index outPath"
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raise ValueError(msg)
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if not isinstance(value, str):
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msg = "outPath must be a string"
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raise ValueError(msg)
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self.value = value
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elif isinstance(value, dict):
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if isinstance(self.selector, set):
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if not all(isinstance(v, str) for v in self.selector):
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msg = "Cannot index dict with non-str set"
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raise ValueError(msg)
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self.value = {}
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for key, value_ in value.items():
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if key == "outPath":
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self.value[key] = FlakeCacheEntry(
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value_, selectors[1:], is_out_path=True
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)
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else:
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self.value[key] = FlakeCacheEntry(value_, selectors[1:])
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elif isinstance(value, list):
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if isinstance(self.selector, int):
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if len(value) != 1:
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msg = "Cannot index list with int selector when value is not singleton"
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raise ValueError(msg)
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self.value = {}
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self.value[int(self.selector)] = FlakeCacheEntry(
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value[0], selectors[1:]
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)
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if isinstance(self.selector, set):
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if all(isinstance(v, int) for v in self.selector):
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self.value = {}
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for i, v in enumerate(self.selector):
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assert isinstance(v, int)
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self.value[int(v)] = FlakeCacheEntry(value[i], selectors[1:])
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else:
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msg = "Cannot index list with non-int set"
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raise ValueError(msg)
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elif isinstance(self.selector, AllSelector):
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self.value = {}
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for i, v in enumerate(value):
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if isinstance(v, dict | list | str | float | int):
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self.value[i] = FlakeCacheEntry(v, selectors[1:])
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else:
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msg = f"expected integer selector or all for type list, but got {type(selectors[0])}"
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raise TypeError(msg)
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elif isinstance(value, str) and value.startswith("/nix/store/"):
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self.value = {}
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self.value["outPath"] = FlakeCacheEntry(
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value, selectors[1:], is_out_path=True
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)
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elif isinstance(value, (str | float | int)):
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self.value = value
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def insert(
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self, value: str | float | dict[str, Any] | list[Any], selectors: list[Selector]
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) -> None:
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selector: Selector
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if selectors == []:
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selector = AllSelector()
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else:
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selector = selectors[0]
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if isinstance(selector, str):
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if isinstance(self.value, dict):
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if selector in self.value:
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self.value[selector].insert(value, selectors[1:])
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else:
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self.value[selector] = FlakeCacheEntry(value, selectors[1:])
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return
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msg = f"Cannot insert {selector} into non dict value"
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raise TypeError(msg)
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if isinstance(selector, AllSelector):
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self.selector = AllSelector()
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elif isinstance(self.selector, set) and isinstance(selector, set):
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self.selector.union(selector)
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if isinstance(self.value, dict) and isinstance(value, dict):
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for key, value_ in value.items():
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if key in self.value:
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self.value[key].insert(value_, selectors[1:])
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else:
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self.value[key] = FlakeCacheEntry(value_, selectors[1:])
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elif isinstance(self.value, dict) and isinstance(value, list):
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if isinstance(selector, set):
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if not all(isinstance(v, int) for v in selector):
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msg = "Cannot list with non-int set"
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raise ValueError(msg)
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for realindex, requested_index in enumerate(selector):
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assert isinstance(requested_index, int)
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if requested_index in self.value:
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self.value[requested_index].insert(
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value[realindex], selectors[1:]
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)
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elif isinstance(selector, AllSelector):
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for index, v in enumerate(value):
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if index in self.value:
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self.value[index].insert(v, selectors[1:])
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else:
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self.value[index] = FlakeCacheEntry(v, selectors[1:])
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elif isinstance(selector, int):
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if selector in self.value:
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self.value[selector].insert(value[0], selectors[1:])
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else:
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self.value[selector] = FlakeCacheEntry(value[0], selectors[1:])
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elif isinstance(value, (str | float | int)):
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if self.value:
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if self.value != value:
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msg = "value mismatch in cache, something is fishy"
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raise TypeError(msg)
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else:
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msg = f"Cannot insert value of type {type(value)} into cache"
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raise TypeError(msg)
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def is_cached(self, selectors: list[Selector]) -> bool:
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selector: Selector
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if selectors == []:
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selector = AllSelector()
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else:
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selector = selectors[0]
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if isinstance(self.value, str | float | int):
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return selectors == []
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if isinstance(selector, AllSelector):
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if isinstance(self.selector, AllSelector):
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return all(
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self.value[sel].is_cached(selectors[1:]) for sel in self.value
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)
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# TODO: check if we already have all the keys anyway?
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return False
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if (
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isinstance(selector, set)
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and isinstance(self.selector, set)
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and isinstance(self.value, dict)
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):
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if not selector.issubset(self.selector):
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return False
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return all(self.value[sel].is_cached(selectors[1:]) for sel in selector)
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if isinstance(selector, str | int) and isinstance(self.value, dict):
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if selector in self.value:
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return self.value[selector].is_cached(selectors[1:])
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return False
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return False
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def select(self, selectors: list[Selector]) -> Any:
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selector: Selector
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if selectors == []:
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selector = AllSelector()
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else:
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selector = selectors[0]
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if selectors == [] and isinstance(self.value, dict) and "outPath" in self.value:
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return self.value["outPath"].value
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if isinstance(self.value, str | float | int):
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return self.value
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if isinstance(self.value, dict):
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if isinstance(selector, AllSelector):
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return {k: v.select(selectors[1:]) for k, v in self.value.items()}
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if isinstance(selector, set):
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return {
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k: v.select(selectors[1:])
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for k, v in self.value.items()
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if k in selector
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}
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if isinstance(selector, str | int):
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return self.value[selector].select(selectors[1:])
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msg = f"Cannot select {selector} from type {type(self.value)}"
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raise TypeError(msg)
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def __getitem__(self, name: str) -> "FlakeCacheEntry":
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if isinstance(self.value, dict):
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return self.value[name]
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msg = f"value is a {type(self.value)}, so cannot subscribe"
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raise TypeError(msg)
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def __repr__(self) -> str:
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if isinstance(self.value, dict):
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return f"FlakeCache {{{', '.join([str(k) for k in self.value])}}}"
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return f"FlakeCache {self.value}"
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class FlakeCache:
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"""
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an in-memory cache for flake outputs, uses a recursive FLakeCacheEntry structure
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"""
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def __init__(self) -> None:
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self.cache: FlakeCacheEntry = FlakeCacheEntry({}, [])
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def insert(self, data: dict[str, Any], selector_str: str) -> None:
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if selector_str:
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selectors = split_selector(selector_str)
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else:
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selectors = []
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self.cache.insert(data, selectors)
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def select(self, selector_str: str) -> Any:
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selectors = split_selector(selector_str)
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return self.cache.select(selectors)
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def is_cached(self, selector_str: str) -> bool:
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selectors = split_selector(selector_str)
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return self.cache.is_cached(selectors)
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def save_to_file(self, path: Path) -> None:
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path.parent.mkdir(parents=True, exist_ok=True)
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with path.open("wb") as f:
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pickle.dump(self.cache, f)
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def load_from_file(self, path: Path) -> None:
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if path.exists():
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with path.open("rb") as f:
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self.cache = pickle.load(f)
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@dataclass
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class Flake:
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"""
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This class represents a flake, and is used to interact with it.
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values can be accessed using the select method, which will fetch the value from the cache if it is present.
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"""
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identifier: str
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def __post_init__(self) -> None:
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self._cache: FlakeCache | None = None
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self._path: Path | None = None
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self._is_local: bool | None = None
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@classmethod
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def from_json(cls: type["Flake"], data: dict[str, Any]) -> "Flake":
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return cls(data["identifier"])
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def __str__(self) -> str:
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return self.identifier
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def __hash__(self) -> int:
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return hash(self.identifier)
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def __eq__(self, other: object) -> bool:
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if not isinstance(other, Flake):
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return NotImplemented
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return self.identifier == other.identifier
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@property
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def is_local(self) -> bool:
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if self._is_local is None:
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self.prefetch()
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assert isinstance(self._is_local, bool)
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return self._is_local
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@property
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def path(self) -> Path:
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if self._path is None:
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self.prefetch()
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assert isinstance(self._path, Path)
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return self._path
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def prefetch(self) -> None:
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flake_prefetch = run(
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nix_command(
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[
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"flake",
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"prefetch",
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"--json",
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"--option",
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"flake-registry",
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"",
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self.identifier,
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]
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)
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)
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flake_metadata = json.loads(flake_prefetch.stdout)
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self.store_path = flake_metadata["storePath"]
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self.hash = flake_metadata["hash"]
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self._cache = FlakeCache()
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self.flake_cache_path = Path(user_cache_dir()) / "clan" / "flakes" / self.hash
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if self.flake_cache_path.exists():
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self._cache.load_from_file(self.flake_cache_path)
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if flake_metadata["original"].get("url", "").startswith("file:"):
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self._is_local = True
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path = flake_metadata["original"]["url"].removeprefix("file://")
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path = path.removeprefix("file:")
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self._path = Path(path)
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elif flake_metadata["original"].get("path"):
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self._is_local = True
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self._path = Path(flake_metadata["original"]["path"])
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else:
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self._is_local = False
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self._path = Path(self.store_path)
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def get_from_nix(self, selectors: list[str]) -> None:
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if self._cache is None:
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self.prefetch()
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assert self._cache is not None
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config = nix_config()
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nix_code = f"""
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let
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flake = builtins.getFlake("path:{self.store_path}?narHash={self.hash}");
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in
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flake.inputs.nixpkgs.legacyPackages.{config["system"]}.writeText "clan-flake-select" (builtins.toJSON [ ({" ".join([f'flake.clanInternals.lib.select "{attr}" flake' for attr in selectors])}) ])
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"""
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build_output = Path(run(nix_build(["--expr", nix_code])).stdout.strip())
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if tmp_store := nix_test_store():
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build_output = tmp_store.joinpath(*build_output.parts[1:])
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outputs = json.loads(build_output.read_text())
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if len(outputs) != len(selectors):
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msg = f"flake_prepare_cache: Expected {len(outputs)} outputs, got {len(outputs)}"
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raise ClanError(msg)
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self._cache.load_from_file(self.flake_cache_path)
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for i, selector in enumerate(selectors):
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self._cache.insert(outputs[i], selector)
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self._cache.save_to_file(self.flake_cache_path)
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def select(self, selector: str) -> Any:
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if self._cache is None:
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self.prefetch()
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assert self._cache is not None
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self._cache.load_from_file(self.flake_cache_path)
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if not self._cache.is_cached(selector):
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log.info(f"Cache miss for {selector}")
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self.get_from_nix([selector])
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return self._cache.select(selector)
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