redis-py中的坑

今天发现，使用redis-py从redis中获取的数据竟然是加密的。

conn = redis.Redis(host='redis_serverip', port=6379, password='redis_password', db=0)

conn.set('string-key1', 'value1')

result = conn.get('string-key1')
print('result:', result)
print('result type:', type(result))
print()

result_decoded = result.decode('utf-8')
print('result_decoded:', result_decoded)
print('result_decoded type:', type(result_decoded))
print()

result_str = str(result)
print('result_str:', result_str)
print('result_str type:', type(result_str))
print()

print('test int in redis...\n')

conn.set('string-key2', 100)
result = conn.get('string-key2')
print('result:', result)
print('result type:', type(result))
print()

result_decoded = int(result)
print('result_decoded:', result_decoded)
print('result_decoded type:', type(result_decoded))

输出:

result: b'value1'
result type: <class 'bytes'>

result_decoded: value1
result_decoded type: <class 'str'>

result_str: b'value1'
result_str type: <class 'str'>

test int in redis...

result: b'100'
result type: <class 'bytes'>

result_decoded: 100
result_decoded type: <class 'int'>

可以看出:

如果传入str，传出的是bytes，需要通过decode('utf-8')进行恢复。

如果传入int，传出的是bytes，需要通过int()进行恢复。

另一种解决办法是在创建redis client时，进行decode设置。

conn = redis.Redis(host='redis_serverip', port=6379, password='redis_password', db=0, decode_responses=True)

conn.set('string-key3', 'value3')

result = conn.get('string-key3')
print('result:', result)
print('result type:', type(result))
print()

print('test int in redis...\n')

conn.set('string-key4', 100)

result = conn.get('string-key4')
print('result:', result)
print('result type:', type(result))
print()

result_decoded = int(result)
print('result_decoded:', result_decoded)
print('result_decoded type:', type(result_decoded))

输出:

result: value3
result type: <class 'str'>

test int in redis...

result: 100
result type: <class 'str'>

result_decoded: 100
result_decoded type: <class 'int'>

这种情况下，str是正常的，int需要注意一下。

参考资料:

Problem with hash get/set