Radosgw main()

介绍

main()作为入口

分析

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/
start up the RADOS connection and then handle HTTP messages as they come in
/

int main(int argc, const char **argv)
{

// dout() messages will be sent to stderr, but FCGX wants messages on stdout
// Redirect stderr to stdout.
TEMP_FAILURE_RETRY(close(STDERR_FILENO));
if (TEMP_FAILURE_RETRY(dup2(STDOUT_FILENO, STDERR_FILENO) < 0)) {
int err = errno;
cout << “failed to redirect stderr to stdout: “ << cpp_strerror(err)
<< std::endl;
return ENOSYS;
}

//设置默认参数
/ alternative default for module /
vector<const char > def_args;
def_args.push_back(“–debug-rgw=1/5”);
def_args.push_back(“–keyring=$rgw_data/keyring”);
def_args.push_back(“–log-file=/var/log/radosgw/$cluster-$name.log”);

vector<const char> args;
argv_to_vec(argc, argv, args); //循环将 argv 中的参数加到 args 中
env_to_vec(args); //获取环境变量 CEPH_ARGS ,并加到 args 中
global_init(&def_args, args, CEPH_ENTITY_TYPE_CLIENT, CODE_ENVIRONMENT_DAEMON,
CINIT_FLAG_UNPRIVILEGED_DAEMON_DEFAULTS); // 创建目录/var/run/ceph 等初始化操作

//判断 args 中是否有 -h 或 –help
for (std::vector<const char>::iterator i = args.begin(); i != args.end(); ++i) {
if (ceph_argparse_flag(args, i, “-h”, “–help”, (char)NULL)) {
usage();
return 0;
}
}

check_curl(); //无操作

if (g_conf->daemonize) {
global_init_daemonize(g_ceph_context, 0);
}
Mutex mutex(“main”);
SafeTimer init_timer(g_ceph_context, mutex);
init_timer.init();
mutex.Lock();
init_timer.add_event_after(g_conf->rgw_init_timeout, new C_InitTimeout);
mutex.Unlock();

common_init_finish(g_ceph_context); //start service thread

rgw_tools_init(g_ceph_context); //初始化mine map,读取文件/etc/mime.types

rgw_init_resolver(); // new RGWResolver()
rgw_rest_init(g_ceph_context); // 设置http header map、http code map

curl_global_init(CURL_GLOBAL_ALL); // null

FCGX_Init(); // null

// 获得实例 store,获得实例meta_mgr、data_log,
// init region、zone,初始化并启动 gc ,获得实例 qutoa_hander
int r = 0;
RGWRados store = RGWStoreManager::get_storage(g_ceph_context, true, true);
if (!store) {
derr << “Couldn’t init storage provider (RADOS)” << dendl;
r = EIO;
}
if (!r)
r = rgw_perf_start(g_ceph_context);

mutex.Lock();
init_timer.cancel_all_events();
init_timer.shutdown();
mutex.Unlock();

if (r)
return 1;

rgw_user_init(store->meta_mgr); // 注册 user_meta_handler
rgw_bucket_init(store->meta_mgr); //注册 bucket_meta_handler、bucket_instance_meta_handler
rgw_log_usage_init(g_ceph_context, store);

RGWREST rest;

list<string> apis;
bool do_swift = false;

get_str_list(g_conf->rgw_enable_apis, apis); // 获得apis,默认 s3, swift, swift_auth, admin

map<string, bool> apis_map;
for (list<string>::iterator li = apis.begin(); li != apis.end(); ++li) {
apis_map[li] = true;
}

if (apis_map.count(“s3”) > 0)
rest.register_default_mgr(set_logging(new RGWRESTMgr_S3));

if (apis_map.count(“swift”) > 0) {
do_swift = true;
swift_init(g_ceph_context);
rest.register_resource(g_conf->rgw_swift_url_prefix, set_logging(new RGWRESTMgr_SWIFT));
}

if (apis_map.count(“swift_auth”) > 0)
rest.register_resource(g_conf->rgw_swift_auth_entry, set_logging(new RGWRESTMgr_SWIFT_Auth));

if (apis_map.count(“admin”) > 0) {
RGWRESTMgr_Admin admin_resource = new RGWRESTMgr_Admin;
admin_resource->register_resource(“usage”, new RGWRESTMgr_Usage);
admin_resource->register_resource(“user”, new RGWRESTMgr_User);
admin_resource->register_resource(“bucket”, new RGWRESTMgr_Bucket);

/Registering resource for /admin/metadata /
admin_resource->register_resource(“metadata”, new RGWRESTMgr_Metadata);
admin_resource->register_resource(“log”, new RGWRESTMgr_Log);
admin_resource->register_resource(“opstate”, new RGWRESTMgr_Opstate);
admin_resource->register_resource(“replica_log”, new RGWRESTMgr_ReplicaLog);
admin_resource->register_resource(“config”, new RGWRESTMgr_Config);
rest.register_resource(g_conf->rgw_admin_entry, admin_resource);
}

//日志文件
OpsLogSocket olog = NULL;

if (!g_conf->rgw_ops_log_socket_path.empty()) {
olog = new OpsLogSocket(g_ceph_context, g_conf->rgw_ops_log_data_backlog);
olog->init(g_conf->rgw_ops_log_socket_path);
}

r = signal_fd_init();
if (r < 0) {
derr << “ERROR: unable to initialize signal fds” << dendl;
exit(1);
}

init_async_signal_handler();
register_async_signal_handler(SIGHUP, sighup_handler);
register_async_signal_handler(SIGTERM, handle_sigterm);
register_async_signal_handler(SIGINT, handle_sigterm);
register_async_signal_handler(SIGUSR1, handle_sigterm);
sighandler_alrm = signal(SIGALRM, godown_alarm);

string frontend_frameworks = g_conf->rgw_frontends;

list<string> frontends;

get_str_list(g_conf->rgw_frontends, “,”, frontends);

multimap<string, RGWFrontendConfig > fe_map;
list<RGWFrontendConfig > configs;
if (frontends.empty()) {
frontends.push_back(“fastcgi”);
}
for (list<string>::iterator iter = frontends.begin(); iter != frontends.end(); ++iter) {
string& f = iter;

RGWFrontendConfig config = new RGWFrontendConfig(f);
int r = config->init();
if (r < 0) {
cerr << “ERROR: failed to init config: “ << f << std::endl;
return EINVAL;
}

configs.push_back(config);

string framework = config->get_framework();
fe_map.insert(make_pair<string, RGWFrontendConfig >(framework, config));
}

list<RGWFrontend > fes;

for (multimap<string, RGWFrontendConfig >::iterator fiter = fe_map.begin(); fiter != fe_map.end(); ++fiter) {
RGWFrontendConfig config = fiter->second;
string framework = config->get_framework();
RGWFrontend fe;
if (framework == “fastcgi” || framework == “fcgi”) {
RGWProcessEnv fcgi_pe = { store, &rest, olog, 0 };

fe = new RGWFCGXFrontend(fcgi_pe, config);
} else if (framework == “civetweb” || framework == “mongoose”) {
string err;

int port;
config->get_val(“port”, 80, &port);

RGWProcessEnv env = { store, &rest, olog, port };

fe = new RGWMongooseFrontend(env, config);
} else if (framework == “loadgen”) {
int port;
config->get_val(“port”, 80, &port);

RGWProcessEnv env = { store, &rest, olog, port };

fe = new RGWLoadGenFrontend(env, config);
} else {
dout(0) << “WARNING: skipping unknown framework: “ << framework << dendl;
continue;
}
dout(0) << “starting handler: “ << fiter->first << dendl;
int r = fe->init();
if (r < 0) {
derr << “ERROR: failed initializing frontend” << dendl;
return -r;
}
fe->run();

fes.push_back(fe);
}

wait_shutdown();

derr << “shutting down” << dendl;

for (list<RGWFrontend >::iterator liter = fes.begin(); liter != fes.end(); ++liter) {
RGWFrontend fe = liter;
fe->stop();
}

for (list<RGWFrontend >::iterator liter = fes.begin(); liter != fes.end(); ++liter) {
RGWFrontend fe = liter;
fe->join();
delete fe;
}

for (list<RGWFrontendConfig >::iterator liter = configs.begin(); liter != configs.end(); ++liter) {
RGWFrontendConfig fec = *liter;
delete fec;
}

unregister_async_signal_handler(SIGHUP, sighup_handler);
unregister_async_signal_handler(SIGTERM, handle_sigterm);
unregister_async_signal_handler(SIGINT, handle_sigterm);
unregister_async_signal_handler(SIGUSR1, handle_sigterm);
shutdown_async_signal_handler();

if (do_swift) {
swift_finalize();
}

rgw_log_usage_finalize();

delete olog;

rgw_perf_stop(g_ceph_context);

RGWStoreManager::close_storage(store);

rgw_tools_cleanup();
rgw_shutdown_resolver();
curl_global_cleanup();

dout(1) << “final shutdown” << dendl;
g_ceph_context->put();

ceph::crypto::shutdown();

signal_fd_finalize();

return 0;
}