355 lines
12 KiB
Python
355 lines
12 KiB
Python
"""
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Redis查询和数据比较模块
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负责Redis数据的查询、随机key获取和数据比较
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"""
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import time
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import logging
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import random
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from redis.cluster import key_slot
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from redis.exceptions import RedisError
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from .redis_client import RedisPerformanceTracker
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logger = logging.getLogger(__name__)
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def get_random_keys_from_redis(redis_client, count=100, pattern="*", performance_tracker=None):
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"""
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从Redis集群中获取随机keys
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Args:
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redis_client: Redis客户端
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count: 要获取的key数量
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pattern: key匹配模式，默认为 "*"
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performance_tracker: 性能追踪器
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Returns:
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list: 随机key列表
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"""
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start_time = time.time()
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keys = set()
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logger.info(f"开始扫描获取随机keys，目标数量: {count}，模式: {pattern}")
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try:
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# 使用scan_iter获取keys
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scan_count = max(count * 2, 1000) # 扫描更多key以确保随机性
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for key in redis_client.scan_iter(match=pattern, count=scan_count):
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keys.add(key)
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if len(keys) >= count * 3: # 获取更多key以便随机选择
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break
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# 如果获取的key数量超过需要的数量，随机选择
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if len(keys) > count:
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keys = random.sample(list(keys), count)
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else:
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keys = list(keys)
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end_time = time.time()
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scan_duration = end_time - start_time
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if performance_tracker:
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performance_tracker.record_scan_time(scan_duration)
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logger.info(f"扫描获取 {len(keys)} 个随机keys，耗时 {scan_duration:.3f} 秒")
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return keys
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except RedisError as e:
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end_time = time.time()
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scan_duration = end_time - start_time
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if performance_tracker:
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performance_tracker.record_scan_time(scan_duration)
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logger.error(f"获取随机keys失败: {e}，耗时 {scan_duration:.3f} 秒")
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return []
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def get_redis_values_by_keys(redis_client, keys, cluster_name="Redis集群", performance_tracker=None):
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"""
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批量查询Redis中指定keys的值，自动适配单节点和集群模式
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Args:
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redis_client: Redis客户端
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keys: 要查询的key列表
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cluster_name: 集群名称用于日志
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performance_tracker: 性能追踪器
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Returns:
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list: 对应keys的值列表，如果key不存在则为None
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"""
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start_time = time.time()
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result = [None] * len(keys)
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logger.info(f"开始从{cluster_name}批量查询 {len(keys)} 个keys")
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try:
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# 检查是否是集群模式
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is_cluster = hasattr(redis_client, 'cluster_nodes')
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if is_cluster:
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# 集群模式：按slot分组keys以优化查询性能
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slot_groups = {}
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for idx, key in enumerate(keys):
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slot = key_slot(key)
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slot_groups.setdefault(slot, []).append((idx, key))
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logger.info(f"集群模式：keys分布在 {len(slot_groups)} 个slot中")
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# 分组批量查询
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for group in slot_groups.values():
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indices, slot_keys = zip(*group)
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values = redis_client.mget(slot_keys)
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for i, v in zip(indices, values):
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result[i] = v
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else:
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# 单节点模式：直接批量查询
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logger.info(f"单节点模式：直接批量查询")
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result = redis_client.mget(keys)
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end_time = time.time()
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query_duration = end_time - start_time
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if performance_tracker:
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performance_tracker.record_query(f"{cluster_name}_batch_query", query_duration)
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# 统计成功获取的key数量
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successful_count = sum(1 for v in result if v is not None)
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logger.info(f"从{cluster_name}查询完成，成功获取 {successful_count}/{len(keys)} 个值，耗时 {query_duration:.3f} 秒")
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return result
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except Exception as e:
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end_time = time.time()
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query_duration = end_time - start_time
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if performance_tracker:
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performance_tracker.record_query(f"{cluster_name}_batch_query_error", query_duration)
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logger.error(f"从{cluster_name}批量查询失败: {e}，耗时 {query_duration:.3f} 秒")
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return result
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def compare_redis_data(client1, client2, keys, cluster1_name="生产集群", cluster2_name="测试集群", performance_tracker=None):
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"""
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比较两个Redis集群中指定keys的数据
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Args:
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client1: 第一个Redis客户端（生产）
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client2: 第二个Redis客户端（测试）
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keys: 要比较的key列表
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cluster1_name: 第一个集群名称
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cluster2_name: 第二个集群名称
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performance_tracker: 性能追踪器
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Returns:
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dict: 比较结果，包含统计信息和差异详情
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"""
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comparison_start_time = time.time()
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logger.info(f"开始比较 {cluster1_name} 和 {cluster2_name} 的数据")
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# 获取两个集群的数据
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values1 = get_redis_values_by_keys(client1, keys, cluster1_name, performance_tracker)
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if values1 is None:
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return {'error': f'从{cluster1_name}获取数据失败'}
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values2 = get_redis_values_by_keys(client2, keys, cluster2_name, performance_tracker)
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if values2 is None:
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return {'error': f'从{cluster2_name}获取数据失败'}
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# 开始数据比对
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compare_start = time.time()
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# 初始化统计数据
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stats = {
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'total_keys': len(keys),
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'identical_count': 0,
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'different_count': 0,
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'missing_in_cluster1': 0,
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'missing_in_cluster2': 0,
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'both_missing': 0
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}
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# 详细结果列表
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identical_results = []
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different_results = []
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missing_results = []
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# 逐个比较
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for i, key in enumerate(keys):
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val1 = values1[i]
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val2 = values2[i]
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# 将bytes转换为字符串用于显示（如果是bytes类型）
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display_val1 = val1.decode('utf-8') if isinstance(val1, bytes) else val1
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display_val2 = val2.decode('utf-8') if isinstance(val2, bytes) else val2
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if val1 is None and val2 is None:
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# 两个集群都没有这个key
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stats['both_missing'] += 1
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missing_results.append({
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'key': key.decode('utf-8') if isinstance(key, bytes) else key,
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'status': 'both_missing',
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'message': '两个集群都不存在该key'
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})
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elif val1 is None:
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# 只有第一个集群没有
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stats['missing_in_cluster1'] += 1
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missing_results.append({
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'key': key.decode('utf-8') if isinstance(key, bytes) else key,
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'status': 'missing_in_cluster1',
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'cluster1_value': None,
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'cluster2_value': display_val2,
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'message': f'在{cluster1_name}中不存在'
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})
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elif val2 is None:
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# 只有第二个集群没有
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stats['missing_in_cluster2'] += 1
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missing_results.append({
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'key': key.decode('utf-8') if isinstance(key, bytes) else key,
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'status': 'missing_in_cluster2',
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'cluster1_value': display_val1,
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'cluster2_value': None,
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'message': f'在{cluster2_name}中不存在'
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})
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elif val1 == val2:
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# 值相同
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stats['identical_count'] += 1
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identical_results.append({
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'key': key.decode('utf-8') if isinstance(key, bytes) else key,
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'value': display_val1
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})
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else:
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# 值不同
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stats['different_count'] += 1
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different_results.append({
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'key': key.decode('utf-8') if isinstance(key, bytes) else key,
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'cluster1_value': display_val1,
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'cluster2_value': display_val2,
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'message': '值不同'
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})
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compare_end = time.time()
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comparison_duration = compare_end - compare_start
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total_duration = compare_end - comparison_start_time
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if performance_tracker:
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performance_tracker.record_comparison_time(comparison_duration)
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# 计算百分比
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def safe_percentage(part, total):
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return round((part / total * 100), 2) if total > 0 else 0
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stats['identical_percentage'] = safe_percentage(stats['identical_count'], stats['total_keys'])
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stats['different_percentage'] = safe_percentage(stats['different_count'], stats['total_keys'])
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stats['missing_percentage'] = safe_percentage(
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stats['missing_in_cluster1'] + stats['missing_in_cluster2'] + stats['both_missing'],
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stats['total_keys']
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)
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result = {
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'success': True,
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'stats': stats,
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'identical_results': identical_results,
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'different_results': different_results,
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'missing_results': missing_results,
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'performance': {
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'comparison_time': comparison_duration,
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'total_time': total_duration
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},
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'clusters': {
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'cluster1_name': cluster1_name,
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'cluster2_name': cluster2_name
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}
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}
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logger.info(f"数据比对完成，耗时 {comparison_duration:.3f} 秒")
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logger.info(f"比对统计: 总计{stats['total_keys']}个key，相同{stats['identical_count']}个，不同{stats['different_count']}个，缺失{stats['missing_in_cluster1'] + stats['missing_in_cluster2'] + stats['both_missing']}个")
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return result
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def execute_redis_comparison(config1, config2, query_options):
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"""
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执行Redis数据比较的主要函数
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Args:
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config1: 第一个Redis集群配置
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config2: 第二个Redis集群配置
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query_options: 查询选项，包含查询模式和参数
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Returns:
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dict: 完整的比较结果
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"""
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from .redis_client import create_redis_client
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# 创建性能追踪器
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performance_tracker = RedisPerformanceTracker()
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cluster1_name = config1.get('name', '生产集群')
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cluster2_name = config2.get('name', '测试集群')
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logger.info(f"开始执行Redis数据比较: {cluster1_name} vs {cluster2_name}")
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# 创建连接
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client1 = create_redis_client(config1, cluster1_name, performance_tracker)
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client2 = create_redis_client(config2, cluster2_name, performance_tracker)
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if not client1:
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return {'error': f'{cluster1_name}连接失败'}
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if not client2:
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return {'error': f'{cluster2_name}连接失败'}
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try:
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# 获取要比较的keys
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keys = []
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query_mode = query_options.get('mode', 'random')
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if query_mode == 'random':
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# 随机获取keys
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count = query_options.get('count', 100)
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pattern = query_options.get('pattern', '*')
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source_cluster = query_options.get('source_cluster', 'cluster2') # 默认从第二个集群获取
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source_client = client2 if source_cluster == 'cluster2' else client1
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source_name = cluster2_name if source_cluster == 'cluster2' else cluster1_name
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logger.info(f"从{source_name}随机获取 {count} 个keys")
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keys = get_random_keys_from_redis(source_client, count, pattern, performance_tracker)
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elif query_mode == 'specified':
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# 指定keys
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keys = query_options.get('keys', [])
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# 如果keys是字符串，需要转换为bytes（Redis通常使用bytes）
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keys = [k.encode('utf-8') if isinstance(k, str) else k for k in keys]
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if not keys:
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return {'error': '未获取到任何keys进行比较'}
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logger.info(f"准备比较 {len(keys)} 个keys")
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# 执行比较
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comparison_result = compare_redis_data(
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client1, client2, keys,
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cluster1_name, cluster2_name,
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performance_tracker
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)
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# 添加性能报告
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comparison_result['performance_report'] = performance_tracker.generate_report()
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comparison_result['query_options'] = query_options
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return comparison_result
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except Exception as e:
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logger.error(f"Redis数据比较执行失败: {e}")
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return {'error': f'执行失败: {str(e)}'}
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finally:
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# 关闭连接
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try:
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if client1:
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client1.close()
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if client2:
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client2.close()
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except:
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pass |