resty_functions/scripts/convert_audio.lua

-- 指定模块引用目录，否则无法加载同目录下的其他文件
--package.path = package.path .. ';/usr/local/opt/openresty/nginx/scripts/?.lua';
package.path = package.path .. ';<SCRIPT_PATH>/?.lua';

local cjson = require "cjson"
local uuid = require "resty.jit-uuid"
local upyun_upload = require("upyun_upload")
local get_wx_media = require("wx_download")

local function convert()

    local file_dir = ngx.var.tmp_file_dir
    ngx.req.read_body()
    local req_body = cjson.decode(ngx.req.get_body_data())
    ngx.log(ngx.INFO, 'REQ_BODY -> ', ngx.req.get_body_data())

    local input_audio_file = get_wx_media(req_body["payload"]["media_id"]);
    local converted_audio_file = file_dir .. "/" .. uuid.generate_v4() .. ".mp3";

    ngx.log(ngx.INFO, "Input audio file -> ", input_audio_file);
    ngx.log(ngx.INFO, "Converted audio file -> ", converted_audio_file);

    local cmd = "/usr/local/bin/file_convert" .. " " .. input_audio_file .. " " .. converted_audio_file

    ngx.log(ngx.INFO, 'Audio convert command -> ', cmd)

    local result, _, code = os.execute(cmd)
    if result and code == 0 then
        ngx.log(ngx.INFO, "result -> ", result);
        upyun_upload.upload(converted_audio_file)
    else
        ngx.status = 500
        ngx.log(ngx.ERR, "AUDIO CONVERT *FAILED*")
    end
end

convert();