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最近在撸gateway的代码，其中用到了redis做缓存，有个地方需要把lua脚本的返回值去适配一个redis的返回值后再给调用方。返回值适配网上很少例子，这里给一个记录一下。

从官网上找到说明：

Redis to Lua conversion table.

• Redis integer reply -> Lua number

• Redis bulk reply -> Lua string

• Redis multi bulk reply -> Lua table (may have other Redis data types nested)

• Redis status reply -> Lua table with a single ok field containing the status

• Redis error reply -> Lua table with a single err field containing the error

• Redis Nil bulk reply and Nil multi bulk reply -> Lua false boolean type

Lua to Redis conversion table.

• Lua number -> Redis integer reply (the number is converted into an integer)

• Lua string -> Redis bulk reply

• Lua table (array) -> Redis multi bulk reply (truncated to the first nil inside the Lua array if any)

• Lua table with a single ok field -> Redis status reply

• Lua table with a single err field -> Redis error reply

• Lua boolean false -> Redis Nil bulk reply.

status reply适配片段：

    local reply = {}

    reply['ok'] = 'OK'

    return reply