OpenResty保存request_body到日志文件

get_body.lua内容如下：

ngx.req.read_body()
local data = ngx.req.get_body_data()
if data ~= nil then                                                                                                
    ngx.var.resp_body = data:sub(1,1000)
end

ngx.req.read_body() # 请求体尚未被读取前，需先调用这句
local data = ngx.req.get_body_data() # 读取请求体
ngx.var.resp_body = data:sub(1,1000) # 控制请求体长度

日志格式:

log_format  main escape=json '{"timestamp_cn":"$time_iso8601",'
                 '"host":"$server_addr",'
                 '"clientip":"$remote_addr",'
                 '"args":"$args",'
                 '"status":"$status",'
                 '"method": "$request_method",'
                 '"bytes":"$body_bytes_sent",'
                 '"request_time":$request_time,'
                 '"upstreamtime":"$upstream_response_time",'
                 '"http_host":"$host",'
                 '"url":"$request_uri",'
                 '"uri":"$uri",'
                 '"referer":"$http_referer",'
                 '"content_type":"$content_type",'
                 '"uuid":"$http_uuid",'
                 '"lan":"$http_lan",'
                 '"ua":"$http_user_agent",'
                 '"app_version":"$http_app_version",'
                 '"device_type":"$http_device_type",'
                 '"isWifi":"$http_isWifi",'
                 '"memberId":"$http_memberId",'
                 '"device_id":"$http_device_id",'
                 '"upstream_cache_status":"$upstream_cache_status",'
                 '"request_body":"$resp_body"}';

# 注意：如果不添加escape=json，request_body会显示成十六进制，会影响将日志通过logstash采集到ES

日志结果：