如何在Redis的Lua cjson中检查nil/null? [英] How to check for nil/null in Redis' Lua cjson?

问题描述

我有一个带代码块的lua脚本，如下所示:

I have a lua script with code block as below:

local call_data     = cjson.decode(ARGV[1])
local other_data    = cjson.decode(ARGV[2])
local data          = {}
local next          = next
local populate_data = function(source)
  if next(source) == nil then
    return
  end

  for property,value in pairs(source) do
    redis.call('HSET', KEYS[2], property, value)
  end
end
populate_data(call_data)
populate_data(other_data)

当我尝试使用以下命令KEYS和ARGV运行脚本时:-

When I try to run the script with the following command KEYS and ARGV as:-

redis-cli --eval dialed.lua "inflight_stats:18" "calls:AC443d7a8111a96ba8074f54a71f0521ce:CA1ec49703eee1959471c71506f43bb42e:dialed" , "{\"from\":\"[phone]\",\"to\":\"[phone]\",\"sid\":\"CA1ec49703eee1959471c71506f43bb42e\",\"status\":\"queued\",\"direction\":\"outbound-api\",\"date_created\":null,\"account_sid\":\"AC443d8a8111a96ba8074f54a71f0521ce\"}" "{\"phone\":\"919943413333\",\"campaign_id\":18,\"caller_session_sid\":\"CA828b163153bf5cc301ef5285e38925f9\"}" 0

错误:-

(error) ERR Error running script (call to f_08dcc69ee8baa0200e0cf552948ab4bc338c9978): @user_script:11: @user_script: 11: Lua redis() command arguments must be strings or integers 

推荐答案

TL; DR表示cjson.decode()返回的值，请使用cjson.null与JSON的null值进行比较.

TL;DR for values returned by cjson.decode(), use cjson.null to compare to JSON's null value.

说明:Lua在表中使用nil标记已删除的条目.如果将JSONinc null转换为Lunatic nil，则解码的对象将损坏.因此，cjson库使用轻量级的userdata类型表示null/nil.

Explanation: Lua uses nil in tables to mark deleted entries. If JSONinc nulls were converted to Lunatic nils, the decoded objects would be corrupt. Therefore, the cjson lib uses a lightweight userdata type to represent null/nil.

您的"call_data"具有一个"date_created"字段，该字段为null，这会导致错误.

Your 'call_data' has a 'date_created' field that is null - that causes the error.

有趣的是，与Lua一样，Redis不会存储nil/null值，因此您必须忽略null值或在Redis中使用特殊值来标记它们.

The funny thing is that Redis, like Lua, will not store a nil/null value, so you'll have to either ignore null values or use a special value in Redis to flag them.

假设您将忽略它们，这是解决问题的一种方法:

Assuming you'll be ignoring them, here's one way around it:

local call_data     = cjson.decode(ARGV[1])
local other_data    = cjson.decode(ARGV[2])
local data          = {}
local next          = next
local null          = cjson.null
local populate_data = function(source)
  if next(source) == nil then
    return
  end

  for property,value in pairs(source) do
    if value ~= null then
      redis.call('HSET', KEYS[2], property, value)
    end
  end
end
populate_data(call_data)
populate_data(other_data)

此外，一个小的优化将是批量更新，如下所示:

Also, a small optimization would be to batch the updates, like so:

  local payload = {}
  for property,value in pairs(source) do
    if value ~= null then
      table.insert(payload, property)
      table.insert(payload, value)
    end
  end
  redis.call('HSET', KEYS[2], unpack(payload))

P.S.如果需要，请查看我编写的 ReJSON -它旨在帮助您解决出现的问题您正在尝试做.

P.S. if you want, look at ReJSON that I wrote - it is designed to help with what it appears that you're trying to do.

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