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2 Commits
f74146bb11
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7b245869d5
| Author | SHA1 | Date | |
|---|---|---|---|
| 7b245869d5 | |||
| f5a2928f1b |
@ -1,167 +1,137 @@
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import asyncio
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import functools
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import json
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import asyncio
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from collections import OrderedDict # Use OrderedDict for O(1) LRU management
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# Assuming snek.system.security exists and security.hash is an async function
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from collections import OrderedDict
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from snek.system import security
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# NOTE: functools.cache is only for synchronous functions and is not used in the class
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# cache = functools.cache # Unused, removed from class logic
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CACHE_MAX_ITEMS_DEFAULT = 5000
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class Cache:
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"""
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An asynchronous, thread-safe, in-memory LRU (Least Recently Used) cache.
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This implementation uses an OrderedDict for efficient O(1) time complexity
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for its core get, set, and delete operations.
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"""
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def __init__(self, app, max_items=CACHE_MAX_ITEMS_DEFAULT):
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self.app = app
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# Replaced dict with OrderedDict for O(1) LRU moves
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self.cache = OrderedDict()
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# OrderedDict is the core of the LRU logic. It remembers the order
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# in which items were inserted.
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self.cache: OrderedDict = OrderedDict()
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self.max_items = max_items
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self.stats = {}
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self.enabled = False
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# LRU list is no longer needed; OrderedDict handles the order
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self.lru = []
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# Add an asyncio Lock for concurrent access safety
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self.enabled = True
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# A lock is crucial to prevent race conditions in an async environment.
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self._lock = asyncio.Lock()
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self.version = ((42 + 420 + 1984 + 1990 + 10 + 6 + 71 + 3004 + 7245) ^ 1337) + 4
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[cite_start]self.version = ((42 + 420 + 1984 + 1990 + 10 + 6 + 71 + 3004 + 7245) ^ 1337) + 4 [cite: 1760]
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# --- Core Cache Logic (Now O(1) operations) ---
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async def get(self, args):
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# Must be protected by a lock for thread safety
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async with self._lock:
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async def get(self, key):
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"""
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Retrieves an item from the cache. If found, it's marked as recently used.
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Returns None if the item is not found or the cache is disabled.
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"""
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if not self.enabled:
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return None
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# Check for cache miss
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if args not in self.cache:
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await self.update_stat(args, "get")
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# print("Cache miss!", args, flush=True)
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async with self._lock:
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if key not in self.cache:
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await self.update_stat(key, "get")
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return None
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await self.update_stat(args, "get")
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# Mark as recently used by moving it to the end of the OrderedDict.
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# This is an O(1) operation.
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self.cache.move_to_end(key)
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await self.update_stat(key, "get")
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return self.cache[key]
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# 1. Update LRU order: Move to end (most recently used)
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# Use self.cache.move_to_end() for O(1) LRU update
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value = self.cache.pop(args) # Pop to get the value
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self.cache[args] = value # Re-add to the end (MRU)
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# NOTE: The original code had a confusing LRU list implementation
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# that was completely wrong. It should have been:
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# 1. Check if in self.cache (dict).
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# 2. If in cache, move it to the front/end of the LRU structure.
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# 3. Return the value.
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# Since self.lru is part of the public interface (used in get_stats),
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# we must maintain its state for that method, but it is not
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# used for core LRU logic anymore.
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# print("Cache hit!", args, flush=True)
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return value
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async def set(self, args, result):
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# Must be protected by a lock for thread safety
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async with self._lock:
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async def set(self, key, value):
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"""
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Adds or updates an item in the cache and marks it as recently used.
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If the cache exceeds its maximum size, the least recently used item is evicted.
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"""
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if not self.enabled:
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return
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is_new = args not in self.cache
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async with self._lock:
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is_new = key not in self.cache
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# 1. Update/Set value
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self.cache[args] = result
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# Add or update the item. If it exists, it's moved to the end.
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self.cache[key] = value
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self.cache.move_to_end(key)
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# 2. Update LRU order (Move to end/MRU)
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self.cache.move_to_end(args)
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await self.update_stat(key, "set")
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await self.update_stat(args, "set")
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# 3. Handle eviction (Now O(1))
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# Evict the least recently used item if the cache is full.
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# This is an O(1) operation.
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if len(self.cache) > self.max_items:
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# popitem(last=False) removes the first (LRU) item
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# popitem(last=False) removes and returns the first (oldest) item.
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evicted_key, _ = self.cache.popitem(last=False)
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# NOTE: The original code failed to update self.lru on eviction.
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# Since we are using OrderedDict, we don't need self.lru for LRU tracking.
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# However, if self.lru must be updated for `get_stats`,
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# we must manage it here and in `get_stats`.
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# For a clean repair, self.cache (OrderedDict) is the source of truth.
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# Optionally, you could log the evicted key here.
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if is_new:
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self.version += 1
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# print(f"Cache store! {len(self.cache)} items. New version:", self.version, flush=True)
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async def delete(self, args):
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# Must be protected by a lock for thread safety
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async with self._lock:
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async def delete(self, key):
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"""Removes an item from the cache if it exists."""
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if not self.enabled:
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return
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if args in self.cache:
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await self.update_stat(args, "delete")
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del self.cache[args]
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# NOTE: No list manipulation needed due to OrderedDict
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# --- Utility Methods (Interface Retained) ---
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async with self._lock:
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if key in self.cache:
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await self.update_stat(key, "delete")
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# Deleting from OrderedDict is an O(1) operation on average.
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del self.cache[key]
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async def get_stats(self):
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# Must be protected by a lock for thread safety
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"""Returns statistics for all items currently in the cache."""
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async with self._lock:
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all_ = []
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# Iterate through self.cache (OrderedDict) to get the MRU-to-LRU order
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# The public interface uses self.lru, so we must generate it here
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# from the source of truth (self.cache keys) in MRU order.
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stats_list = []
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# Items are iterated from oldest to newest. We reverse to show
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# most recently used items first.
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for key in reversed(self.cache):
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stat_data = self.stats.get(key, {"set": 0, "get": 0, "delete": 0})
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value = self.cache[key]
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value_record = value.record if hasattr(value, 'record') else value
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# Generate the keys in MRU order (reverse of iteration)
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lru_keys = list(self.cache.keys())
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# For the original self.lru list, front was MRU, back was LRU
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lru_keys.reverse()
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self.lru = lru_keys # Update the redundant public attribute self.lru
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stats_list.append({
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"key": key,
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"set": stat_data.get("set", 0),
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"get": stat_data.get("get", 0),
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"delete": stat_data.get("delete", 0),
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"value": str(self.serialize(value_record)),
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})
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return stats_list
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for key in self.lru:
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async def update_stat(self, key, action):
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"""Updates hit/miss/set counts for a given cache key."""
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# This method is already called within a locked context,
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# but the lock makes it safe if ever called directly.
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async with self._lock:
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if key not in self.stats:
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self.stats[key] = {"set": 0, "get": 0, "delete": 0}
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self.stats[key][action] += 1
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# Handling potential KeyError if key was evicted but stat remains
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if key in self.cache:
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value_record = self.cache[key].record if hasattr(self.cache.get(key), 'record') else self.cache[key]
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all_.append(
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{
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"key": key,
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"set": self.stats[key]["set"],
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"get": self.stats[key]["get"],
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"delete": self.stats[key]["delete"],
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"value": str(self.serialize(value_record)),
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}
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)
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return all_
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# Made synchronous as it's a CPU-bound operation
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def serialize(self, obj):
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"""A synchronous helper to create a serializable representation of an object."""
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if not isinstance(obj, dict):
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return obj
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cpy = obj.copy()
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cpy.pop("created_at", None)
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cpy.pop("deleted_at", None)
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cpy.pop("email", None)
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cpy.pop("password", None)
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for key_to_remove in ["created_at", "deleted_at", "email", "password"]:
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cpy.pop(key_to_remove, None)
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return cpy
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# Made synchronous as it's a CPU-bound operation
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async def update_stat(self, key, action):
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# Although called within locked methods, we lock it here to make it safe
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# if called directly, as the original signature is async.
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async with self._lock:
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if key not in self.stats:
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self.stats[key] = {"set": 0, "get": 0, "delete": 0}
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self.stats[key][action] = self.stats[key][action] + 1
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# Made synchronous as it's a CPU-bound operation
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def json_default(self, value):
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"""JSON serializer fallback for objects that are not directly serializable."""
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try:
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return json.dumps(value.__dict__, default=str)
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except:
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return str(value)
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# Retained async due to the call to await security.hash()
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async def create_cache_key(self, args, kwargs):
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# CPU-bound operations don't need a lock, but retain async for security.hash
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"""Creates a consistent, hashable cache key from function arguments."""
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# security.hash is async, so this method remains async.
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return await security.hash(
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json.dumps(
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{"args": args, "kwargs": kwargs},
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@ -171,7 +141,7 @@ class Cache:
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)
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def async_cache(self, func):
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# No change to the decorator structure
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"""Decorator to cache the results of an async function."""
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@functools.wraps(func)
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async def wrapper(*args, **kwargs):
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cache_key = await self.create_cache_key(args, kwargs)
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@ -184,27 +154,11 @@ class Cache:
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return wrapper
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def async_delete_cache(self, func):
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# The internal logic is now clean O(1) using self.delete()
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"""Decorator to invalidate a cache entry before running an async function."""
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@functools.wraps(func)
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async def wrapper(*args, **kwargs):
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cache_key = await self.create_cache_key(args, kwargs)
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# Use the fixed self.delete method
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await self.delete(cache_key)
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return await func(*args, **kwargs)
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return wrapper
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# --- Standalone async_cache (No Change) ---
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# NOTE: This implementation is separate from the Cache class and is not LRU.
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def async_cache(func):
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cache = {}
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@functools.wraps(func)
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async def wrapper(*args):
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if args in cache:
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return cache[args]
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result = await func(*args)
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cache[args] = result
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return result
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return wrapper
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@ -1,78 +0,0 @@
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import asyncio
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import logging
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import os
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import asyncssh
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asyncssh.set_debug_level(2)
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logging.basicConfig(level=logging.DEBUG)
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# Configuration for SFTP server
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SFTP_ROOT = "." # Directory to serve
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USERNAME = "test"
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PASSWORD = "woeii"
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HOST = "localhost"
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PORT = 2225
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class MySFTPServer(asyncssh.SFTPServer):
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def __init__(self, chan):
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super().__init__(chan)
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self.root = os.path.abspath(SFTP_ROOT)
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async def stat(self, path):
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"""Handles 'stat' command from SFTP client"""
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full_path = os.path.join(self.root, path.lstrip("/"))
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return await super().stat(full_path)
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async def open(self, path, flags, attrs):
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"""Handles file open requests"""
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full_path = os.path.join(self.root, path.lstrip("/"))
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return await super().open(full_path, flags, attrs)
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async def listdir(self, path):
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"""Handles directory listing"""
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full_path = os.path.join(self.root, path.lstrip("/"))
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return await super().listdir(full_path)
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class MySSHServer(asyncssh.SSHServer):
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"""Custom SSH server to handle authentication"""
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def connection_made(self, conn):
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print(f"New connection from {conn.get_extra_info('peername')}")
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def connection_lost(self, exc):
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print("Client disconnected")
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def begin_auth(self, username):
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return True # No additional authentication steps
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def password_auth_supported(self):
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return True # Support password authentication
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def validate_password(self, username, password):
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print(username, password)
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return True
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return username == USERNAME and password == PASSWORD
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async def start_sftp_server():
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os.makedirs(SFTP_ROOT, exist_ok=True) # Ensure the root directory exists
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await asyncssh.create_server(
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lambda: MySSHServer(),
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host=HOST,
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port=PORT,
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server_host_keys=["ssh_host_key"],
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process_factory=MySFTPServer,
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)
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print(f"SFTP server running on {HOST}:{PORT}")
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await asyncio.Future() # Keep running forever
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if __name__ == "__main__":
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try:
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asyncio.run(start_sftp_server())
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except (OSError, asyncssh.Error) as e:
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print(f"Error starting SFTP server: {e}")
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@ -1,77 +0,0 @@
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import asyncio
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import os
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import asyncssh
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# SSH Server Configuration
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HOST = "0.0.0.0"
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PORT = 2225
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USERNAME = "user"
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PASSWORD = "password"
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SHELL = "/bin/sh" # Change to another shell if needed
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class CustomSSHServer(asyncssh.SSHServer):
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def connection_made(self, conn):
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print(f"New connection from {conn.get_extra_info('peername')}")
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def connection_lost(self, exc):
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print("Client disconnected")
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def password_auth_supported(self):
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return True
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def validate_password(self, username, password):
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return username == USERNAME and password == PASSWORD
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async def custom_bash_process(process):
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"""Spawns a custom bash shell process"""
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env = os.environ.copy()
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env["TERM"] = "xterm-256color"
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# Start the Bash shell
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bash_proc = await asyncio.create_subprocess_exec(
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SHELL,
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"-i",
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stdin=asyncio.subprocess.PIPE,
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stdout=asyncio.subprocess.PIPE,
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stderr=asyncio.subprocess.PIPE,
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env=env,
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)
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async def read_output():
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while True:
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data = await bash_proc.stdout.read(1)
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if not data:
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break
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process.stdout.write(data)
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async def read_input():
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while True:
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data = await process.stdin.read(1)
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if not data:
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break
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bash_proc.stdin.write(data)
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await asyncio.gather(read_output(), read_input())
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async def start_ssh_server():
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"""Starts the AsyncSSH server with Bash"""
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await asyncssh.create_server(
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lambda: CustomSSHServer(),
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host=HOST,
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port=PORT,
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server_host_keys=["ssh_host_key"],
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process_factory=custom_bash_process,
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)
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print(f"SSH server running on {HOST}:{PORT}")
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await asyncio.Future() # Keep running
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if __name__ == "__main__":
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try:
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asyncio.run(start_ssh_server())
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except (OSError, asyncssh.Error) as e:
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print(f"Error starting SSH server: {e}")
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@ -1,74 +0,0 @@
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#!/usr/bin/env python3.7
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#
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# Copyright (c) 2013-2024 by Ron Frederick <ronf@timeheart.net> and others.
|
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#
|
||||
# This program and the accompanying materials are made available under
|
||||
# the terms of the Eclipse Public License v2.0 which accompanies this
|
||||
# distribution and is available at:
|
||||
#
|
||||
# http://www.eclipse.org/legal/epl-2.0/
|
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#
|
||||
# This program may also be made available under the following secondary
|
||||
# licenses when the conditions for such availability set forth in the
|
||||
# Eclipse Public License v2.0 are satisfied:
|
||||
#
|
||||
# GNU General Public License, Version 2.0, or any later versions of
|
||||
# that license
|
||||
#
|
||||
# SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
|
||||
#
|
||||
# Contributors:
|
||||
# Ron Frederick - initial implementation, API, and documentation
|
||||
|
||||
# To run this program, the file ``ssh_host_key`` must exist with an SSH
|
||||
# private key in it to use as a server host key. An SSH host certificate
|
||||
# can optionally be provided in the file ``ssh_host_key-cert.pub``.
|
||||
#
|
||||
# The file ``ssh_user_ca`` must exist with a cert-authority entry of
|
||||
# the certificate authority which can sign valid client certificates.
|
||||
|
||||
import asyncio
|
||||
import sys
|
||||
|
||||
import asyncssh
|
||||
|
||||
|
||||
async def handle_client(process: asyncssh.SSHServerProcess) -> None:
|
||||
|
||||
width, height, pixwidth, pixheight = process.term_size
|
||||
|
||||
process.stdout.write(
|
||||
f"Terminal type: {process.term_type}, " f"size: {width}x{height}"
|
||||
)
|
||||
if pixwidth and pixheight:
|
||||
process.stdout.write(f" ({pixwidth}x{pixheight} pixels)")
|
||||
process.stdout.write("\nTry resizing your window!\n")
|
||||
|
||||
while not process.stdin.at_eof():
|
||||
try:
|
||||
await process.stdin.read()
|
||||
except asyncssh.TerminalSizeChanged as exc:
|
||||
process.stdout.write(f"New window size: {exc.width}x{exc.height}")
|
||||
if exc.pixwidth and exc.pixheight:
|
||||
process.stdout.write(f" ({exc.pixwidth}" f"x{exc.pixheight} pixels)")
|
||||
process.stdout.write("\n")
|
||||
|
||||
|
||||
async def start_server() -> None:
|
||||
await asyncssh.listen(
|
||||
"",
|
||||
2230,
|
||||
server_host_keys=["ssh_host_key"],
|
||||
# authorized_client_keys='ssh_user_ca',
|
||||
process_factory=handle_client,
|
||||
)
|
||||
|
||||
|
||||
loop = asyncio.new_event_loop()
|
||||
|
||||
try:
|
||||
loop.run_until_complete(start_server())
|
||||
except (OSError, asyncssh.Error) as exc:
|
||||
sys.exit("Error starting server: " + str(exc))
|
||||
|
||||
loop.run_forever()
|
||||
@ -1,90 +0,0 @@
|
||||
#!/usr/bin/env python3.7
|
||||
#
|
||||
# Copyright (c) 2013-2024 by Ron Frederick <ronf@timeheart.net> and others.
|
||||
#
|
||||
# This program and the accompanying materials are made available under
|
||||
# the terms of the Eclipse Public License v2.0 which accompanies this
|
||||
# distribution and is available at:
|
||||
#
|
||||
# http://www.eclipse.org/legal/epl-2.0/
|
||||
#
|
||||
# This program may also be made available under the following secondary
|
||||
# licenses when the conditions for such availability set forth in the
|
||||
# Eclipse Public License v2.0 are satisfied:
|
||||
#
|
||||
# GNU General Public License, Version 2.0, or any later versions of
|
||||
# that license
|
||||
#
|
||||
# SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
|
||||
#
|
||||
# Contributors:
|
||||
# Ron Frederick - initial implementation, API, and documentation
|
||||
|
||||
# To run this program, the file ``ssh_host_key`` must exist with an SSH
|
||||
# private key in it to use as a server host key. An SSH host certificate
|
||||
# can optionally be provided in the file ``ssh_host_key-cert.pub``.
|
||||
|
||||
import asyncio
|
||||
import sys
|
||||
from typing import Optional
|
||||
|
||||
import asyncssh
|
||||
import bcrypt
|
||||
|
||||
passwords = {
|
||||
"guest": b"", # guest account with no password
|
||||
"user": bcrypt.hashpw(b"user", bcrypt.gensalt()),
|
||||
}
|
||||
|
||||
|
||||
def handle_client(process: asyncssh.SSHServerProcess) -> None:
|
||||
username = process.get_extra_info("username")
|
||||
process.stdout.write(f"Welcome to my SSH server, {username}!\n")
|
||||
# process.exit(0)
|
||||
|
||||
|
||||
class MySSHServer(asyncssh.SSHServer):
|
||||
def connection_made(self, conn: asyncssh.SSHServerConnection) -> None:
|
||||
peername = conn.get_extra_info("peername")[0]
|
||||
print(f"SSH connection received from {peername}.")
|
||||
|
||||
def connection_lost(self, exc: Optional[Exception]) -> None:
|
||||
if exc:
|
||||
print("SSH connection error: " + str(exc), file=sys.stderr)
|
||||
else:
|
||||
print("SSH connection closed.")
|
||||
|
||||
def begin_auth(self, username: str) -> bool:
|
||||
# If the user's password is the empty string, no auth is required
|
||||
return passwords.get(username) != b""
|
||||
|
||||
def password_auth_supported(self) -> bool:
|
||||
return True
|
||||
|
||||
def validate_password(self, username: str, password: str) -> bool:
|
||||
if username not in passwords:
|
||||
return False
|
||||
pw = passwords[username]
|
||||
if not password and not pw:
|
||||
return True
|
||||
return bcrypt.checkpw(password.encode("utf-8"), pw)
|
||||
|
||||
|
||||
async def start_server() -> None:
|
||||
await asyncssh.create_server(
|
||||
MySSHServer,
|
||||
"",
|
||||
2231,
|
||||
server_host_keys=["ssh_host_key"],
|
||||
process_factory=handle_client,
|
||||
)
|
||||
|
||||
|
||||
loop = asyncio.new_event_loop()
|
||||
|
||||
try:
|
||||
loop.run_until_complete(start_server())
|
||||
except (OSError, asyncssh.Error) as exc:
|
||||
sys.exit("Error starting server: " + str(exc))
|
||||
|
||||
loop.run_forever()
|
||||
@ -1,112 +0,0 @@
|
||||
#!/usr/bin/env python3.7
|
||||
#
|
||||
# Copyright (c) 2016-2024 by Ron Frederick <ronf@timeheart.net> and others.
|
||||
#
|
||||
# This program and the accompanying materials are made available under
|
||||
# the terms of the Eclipse Public License v2.0 which accompanies this
|
||||
# distribution and is available at:
|
||||
#
|
||||
# http://www.eclipse.org/legal/epl-2.0/
|
||||
#
|
||||
# This program may also be made available under the following secondary
|
||||
# licenses when the conditions for such availability set forth in the
|
||||
# Eclipse Public License v2.0 are satisfied:
|
||||
#
|
||||
# GNU General Public License, Version 2.0, or any later versions of
|
||||
# that license
|
||||
#
|
||||
# SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
|
||||
#
|
||||
# Contributors:
|
||||
# Ron Frederick - initial implementation, API, and documentation
|
||||
|
||||
# To run this program, the file ``ssh_host_key`` must exist with an SSH
|
||||
# private key in it to use as a server host key. An SSH host certificate
|
||||
# can optionally be provided in the file ``ssh_host_key-cert.pub``.
|
||||
#
|
||||
# The file ``ssh_user_ca`` must exist with a cert-authority entry of
|
||||
# the certificate authority which can sign valid client certificates.
|
||||
|
||||
import asyncio
|
||||
import sys
|
||||
from typing import List, cast
|
||||
|
||||
import asyncssh
|
||||
|
||||
|
||||
class ChatClient:
|
||||
_clients: List["ChatClient"] = []
|
||||
|
||||
def __init__(self, process: asyncssh.SSHServerProcess):
|
||||
self._process = process
|
||||
|
||||
@classmethod
|
||||
async def handle_client(cls, process: asyncssh.SSHServerProcess):
|
||||
await cls(process).run()
|
||||
|
||||
async def readline(self) -> str:
|
||||
return cast(str, self._process.stdin.readline())
|
||||
|
||||
def write(self, msg: str) -> None:
|
||||
self._process.stdout.write(msg)
|
||||
|
||||
def broadcast(self, msg: str) -> None:
|
||||
for client in self._clients:
|
||||
if client != self:
|
||||
client.write(msg)
|
||||
|
||||
def begin_auth(self, username: str) -> bool:
|
||||
# If the user's password is the empty string, no auth is required
|
||||
# return False
|
||||
return True # passwords.get(username) != b''
|
||||
|
||||
def password_auth_supported(self) -> bool:
|
||||
return True
|
||||
|
||||
def validate_password(self, username: str, password: str) -> bool:
|
||||
# if username not in passwords:
|
||||
# return False
|
||||
# pw = passwords[username]
|
||||
# if not password and not pw:
|
||||
# return True
|
||||
return True
|
||||
# return bcrypt.checkpw(password.encode('utf-8'), pw)
|
||||
|
||||
async def run(self) -> None:
|
||||
self.write("Welcome to chat!\n\n")
|
||||
|
||||
self.write("Enter your name: ")
|
||||
name = (await self.readline()).rstrip("\n")
|
||||
|
||||
self.write(f"\n{len(self._clients)} other users are connected.\n\n")
|
||||
|
||||
self._clients.append(self)
|
||||
self.broadcast(f"*** {name} has entered chat ***\n")
|
||||
|
||||
try:
|
||||
async for line in self._process.stdin:
|
||||
self.broadcast(f"{name}: {line}")
|
||||
except asyncssh.BreakReceived:
|
||||
pass
|
||||
|
||||
self.broadcast(f"*** {name} has left chat ***\n")
|
||||
self._clients.remove(self)
|
||||
|
||||
|
||||
async def start_server() -> None:
|
||||
await asyncssh.listen(
|
||||
"",
|
||||
2235,
|
||||
server_host_keys=["ssh_host_key"],
|
||||
process_factory=ChatClient.handle_client,
|
||||
)
|
||||
|
||||
|
||||
loop = asyncio.new_event_loop()
|
||||
|
||||
try:
|
||||
loop.run_until_complete(start_server())
|
||||
except (OSError, asyncssh.Error) as exc:
|
||||
sys.exit("Error starting server: " + str(exc))
|
||||
|
||||
loop.run_forever()
|
||||
Loading…
Reference in New Issue
Block a user