<commit_before>"""
LRU-Cache implementation for formatted (`format=`) answers
"""

import datetime
import re
import time
import os
import hashlib

import pytz
import pylru

from globals import LRU_CACHE

CACHE_SIZE = 10000
CACHE = pylru.lrucache(CACHE_SIZE)

# strings longer than this are stored not in ram
# but in the file cache
MIN_SIZE_FOR_FILECACHE = 80

def _update_answer(answer):
    def _now_in_tz(timezone):
        return datetime.datetime.now(pytz.timezone(timezone)).strftime("%H:%M:%S%z")

    if isinstance(answer, str) and "%{{NOW(" in answer:
        answer = re.sub(r"%{{NOW\(([^}]*)\)}}", lambda x: _now_in_tz(x.group(1)), answer)

    return answer

def get_signature(user_agent, query_string, client_ip_address, lang):
    """
    Get cache signature based on `user_agent`, `url_string`,
    `lang`, and `client_ip_address`
    """

    timestamp = int(time.time() / 1000)
    signature = "%s:%s:%s:%s:%s" % \
        (user_agent, query_string, client_ip_address, lang, timestamp)
    print(signature)
    return signature

def get(signature):
    """
    If `update_answer` is not True, return answer as it is
    stored in the cache. Otherwise update it, using
    the `_update_answer` function.
    """

    value = CACHE.get(signature)
    if value:
        if value.startswith("file:") or value.startswith("bfile:"):
            value = _read_from_file(signature, sighash=value)
            if not value:
                return None
        return _update_answer(value)
    return None

def store(signature, value):
    """
    Store in cache `value` for `signature`
    """
    if len(value) < MIN_SIZE_FOR_FILECACHE:
        CACHE[signature] = value
    else:
        CACHE[signature] = _store_in_file(signature, value)
    return _update_answer(value)

def _hash(signature):
    return hashlib.md5(signature.encode("utf-8")).hexdigest()

def _store_in_file(signature, value):
    """Store `value` for `signature` in cache file.
    Return file name (signature_hash) as the result.
    `value` can be string as well as bytes.
    Returned filename is prefixed with "file:" (for text files)
    or "bfile:" (for binary files).
    """

    signature_hash = _hash(signature)
    filename = os.path.join(LRU_CACHE, signature_hash)
    if not os.path.exists(LRU_CACHE):
        os.makedirs(LRU_CACHE)

    if isinstance(value, bytes):<commit_msg>cache.py: add timestamp to each entry<commit_after>"""
LRU-Cache implementation for formatted (`format=`) answers
"""

import datetime
import re
import time
import os
import hashlib
import random

import pytz
import pylru

from globals import LRU_CACHE

CACHE_SIZE = 10000
CACHE = pylru.lrucache(CACHE_SIZE)

# strings longer than this are stored not in ram
# but in the file cache
MIN_SIZE_FOR_FILECACHE = 80

def _update_answer(answer):
    def _now_in_tz(timezone):
        return datetime.datetime.now(pytz.timezone(timezone)).strftime("%H:%M:%S%z")

    if isinstance(answer, str) and "%{{NOW(" in answer:
        answer = re.sub(r"%{{NOW\(([^}]*)\)}}", lambda x: _now_in_tz(x.group(1)), answer)

    return answer

def get_signature(user_agent, query_string, client_ip_address, lang):
    """
    Get cache signature based on `user_agent`, `url_string`,
    `lang`, and `client_ip_address`
    """

    signature = "%s:%s:%s:%s" % \
        (user_agent, query_string, client_ip_address, lang)
    print(signature)
    return signature

def get(signature):
    """
    If `update_answer` is not True, return answer as it is
    stored in the cache. Otherwise update it, using
    the `_update_answer` function.
    """

    value_record = CACHE.get(signature)
    if not value_record:
        return None

    value = value_record["val"]
    expiry = value_record["expiry"]
    if value and time.time() < expiry:
        if value.startswith("file:") or value.startswith("bfile:"):
            value = _read_from_file(signature, sighash=value)
            if not value:
                return None
        return _update_answer(value)
    return None

def _randint(minimum, maximum):
    return random.randrange(maximum - minimum)

def store(signature, value):
    """
    Store in cache `value` for `signature`
    """

    if len(value) >= MIN_SIZE_FOR_FILECACHE:
        value_to_store = _store_in_file(signature, value)
    else:
        value_to_store = value

    value_record = {
        "val": value_to_store,
        "expiry": time.time() + _randint(1000, 2000)*1000,
        }

    CACHE[signature] = value_record

    return _update_answer(value)

def _hash(signature):
    return hashlib.md5(signature.encode("utf-8")).hexdigest()

def _store_in_file(signature, value):
    """Store `value` for `signature` in cache file.
    Return file name (signature_hash) as the result.
    `value` can be string as well as bytes.
    Returned filename is prefixed with "file:" (for text files)
    or "bfile:" (for binary files).
    """

    signature_hash = _hash(signature)
    filename = os.path.join(LRU_CACHE, signature_hash)
    if not os.path.exists(LRU_CACHE):
        os.makedirs(LRU_CACHE)

    if isinstance(value, bytes):
{'fraction_non_alphanumeric': 0.1162426614481409, 'fraction_numerical': 0.0070450097847358124, 'mean_word_length': 3.387124463519313, 'pattern_counts': {'":': 2, '<': 5, '<?xml version=': 0, '>': 4, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '1589363', 'n_tokens_mistral': 1690, 'n_tokens_neox': 1609, 'n_words': 453}