APISIX 是怎么跑起来的

git clone https://github.com/apache/apisix.gitcd apisix

# bin/apisix
## 找到apisix.lua，并执行if [ -s './apisix/cli/apisix.lua' ]; then    # install via source    APISIX_LUA=./apisix/cli/apisix.luaelif [ -s '/usr/local/share/lua/5.1/apisix/cli/apisix.lua' ]; then    # install via luarock    APISIX_LUA=/usr/local/share/lua/5.1/apisix/cli/apisix.luaelse    # install via official rpm or docker    APISIX_LUA=/usr/local/apisix/apisix/cli/apisix.luafi

# bin/apisix
# 找到luajit的绝对路径LUAJIT_BIN=$(${OR_EXEC} -V 2>&1 | grep prefix | grep -Eo 'prefix=(.*)/nginx\s+--' | grep -Eo '/.*/')luajit/bin/luajit
# use the luajit of openresty# 执行 apisix/cli/apisix.luaexec $LUAJIT_BIN $APISIX_LUA $*

-- apisix/cli/apisix.lua
-- apisix_home, pkg_cpath_org, pkg_path_org 为代码/动态链接库目录-- 这里是检测+计算所需要的环境变量（主要是apisix依赖信息等）local env = require("apisix.cli.env")(apisix_home, pkg_cpath_org, pkg_path_org)
-- 执行 execute 函数local ops = require("apisix.cli.ops")ops.execute(env, arg)

-- apisix/cli/env.lua
-- require("apisix.cli.env")(apisix_home, pkg_cpath_org, pkg_path_org)-- 这里返回一个键值对对象信息，值为计算的配置信息return {  apisix_home = apisix_home,  is_root_path = is_root_path,  openresty_args = openresty_args,  pkg_cpath_org = pkg_cpath_org,  pkg_path_org = pkg_path_org,  min_etcd_version = min_etcd_version,  ulimit = ulimit,}

-- apisix/cli/ops.lua
-- local function init(env)-- sys_conf 用于渲染模板的数据-- ngx_tpl: apisix/cli/ngx_tpl.lua，这里是一个 nginx.conf 的模板，渲染后获取供nginx执行的配置文件。nginx根据 nginx.conf 的配置信息来加载lua插件sys_conf["extra_lua_path"] = get_lua_path(yaml_conf.apisix.extra_lua_path)sys_conf["extra_lua_cpath"] = get_lua_path(yaml_conf.apisix.extra_lua_cpath)
-- 渲染模板local conf_render = template.compile(ngx_tpl)local ngxconf = conf_render(sys_conf)
-- 写入到文件中local ok, err = util.write_file(env.apisix_home .. "/conf/nginx.conf", ngxconf)

-- apisix/cli/ops.lua
-- 根据需要初始化etcdif env.deployment_role ~= "data_plane" then  init_etcd(env, args)end

-- apisix/cli/ops.lua-- openresty -p /usr/local/apisix -c /usr/local/apisix/conf/nginx.confutil.execute_cmd(env.openresty_args)