SSL with lua-resty-redis

redis_ssl.lua

local redis_client, err = redis:new()
if not redis_client then
    log(WARN, err)
    return nil
end

redis_client:set_timeout(_redis_timeout)
local ok, err = redis_client:connect(_redis_host, _redis_port)
if not ok then
    log(WARN, err)
    return nil
end

-- Performing the ssl handshake can incur significant overhead. This
-- shouldn't make much of an impact overall since in general the connections
-- will be reused as long as we get enough traffic that they do not expire.
local reused, err = redis_client:get_reused_times()

if reused == nil then
    log(WARN, err)
    return nil
elseif reused == 0 then
    redis_client:set_timeout(_redis_timeout * 10)
    local sock = redis_client['_sock']
    ok, err = sock:sslhandshake()
    if not ok then
        log(WARN, err)
        return nil
    end
    redis_client:set_timeout(_redis_timeout)
end

-- Business logic goes here...

-- Set keepalive before returning to the nginx request
local ok, err = redis_client:set_keepalive(keepalive_timeout, pool_size)