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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab ft=cpp
#include <lua.hpp>
#include "services/svc_zone.h"
#include "rgw_lua_utils.h"
#include "rgw_sal_rados.h"
#include "rgw_lua.h"
#ifdef WITH_RADOSGW_LUA_PACKAGES
#include <filesystem>
#include <boost/process.hpp>
#endif
#define dout_subsys ceph_subsys_rgw
namespace rgw::lua {
context to_context(const std::string& s)
{
if (strcasecmp(s.c_str(), "prerequest") == 0) {
return context::preRequest;
}
if (strcasecmp(s.c_str(), "postrequest") == 0) {
return context::postRequest;
}
if (strcasecmp(s.c_str(), "background") == 0) {
return context::background;
}
if (strcasecmp(s.c_str(), "getdata") == 0) {
return context::getData;
}
if (strcasecmp(s.c_str(), "putdata") == 0) {
return context::putData;
}
return context::none;
}
std::string to_string(context ctx)
{
switch (ctx) {
case context::preRequest:
return "prerequest";
case context::postRequest:
return "postrequest";
case context::background:
return "background";
case context::getData:
return "getdata";
case context::putData:
return "putdata";
case context::none:
break;
}
return "none";
}
bool verify(const std::string& script, std::string& err_msg)
{
lua_State *L = luaL_newstate();
lua_state_guard guard(L);
open_standard_libs(L);
try {
if (luaL_loadstring(L, script.c_str()) != LUA_OK) {
err_msg.assign(lua_tostring(L, -1));
return false;
}
} catch (const std::runtime_error& e) {
err_msg = e.what();
return false;
}
err_msg = "";
return true;
}
std::string script_oid(context ctx, const std::string& tenant) {
static const std::string SCRIPT_OID_PREFIX("script.");
return SCRIPT_OID_PREFIX + to_string(ctx) + "." + tenant;
}
int read_script(const DoutPrefixProvider *dpp, sal::LuaManager* manager, const std::string& tenant, optional_yield y, context ctx, std::string& script)
{
return manager ? manager->get_script(dpp, y, script_oid(ctx, tenant), script) : -ENOENT;
}
int write_script(const DoutPrefixProvider *dpp, sal::LuaManager* manager, const std::string& tenant, optional_yield y, context ctx, const std::string& script)
{
return manager ? manager->put_script(dpp, y, script_oid(ctx, tenant), script) : -ENOENT;
}
int delete_script(const DoutPrefixProvider *dpp, sal::LuaManager* manager, const std::string& tenant, optional_yield y, context ctx)
{
return manager ? manager->del_script(dpp, y, script_oid(ctx, tenant)) : -ENOENT;
}
#ifdef WITH_RADOSGW_LUA_PACKAGES
namespace bp = boost::process;
int add_package(const DoutPrefixProvider *dpp, rgw::sal::Driver* driver, optional_yield y, const std::string& package_name, bool allow_compilation)
{
// verify that luarocks can load this package
const auto p = bp::search_path("luarocks");
if (p.empty()) {
return -ECHILD;
}
bp::ipstream is;
const auto cmd = p.string() + " search --porcelain" + (allow_compilation ? " " : " --binary ") + package_name;
bp::child c(cmd,
bp::std_in.close(),
bp::std_err > bp::null,
bp::std_out > is);
std::string line;
bool package_found = false;
while (c.running() && std::getline(is, line) && !line.empty()) {
package_found = true;
}
c.wait();
auto ret = c.exit_code();
if (ret) {
return -ret;
}
if (!package_found) {
return -EINVAL;
}
//replace previous versions of the package
const std::string package_name_no_version = package_name.substr(0, package_name.find(" "));
ret = remove_package(dpp, driver, y, package_name_no_version);
if (ret < 0) {
return ret;
}
auto lua_mgr = driver->get_lua_manager();
return lua_mgr->add_package(dpp, y, package_name);
}
int remove_package(const DoutPrefixProvider *dpp, rgw::sal::Driver* driver, optional_yield y, const std::string& package_name)
{
auto lua_mgr = driver->get_lua_manager();
return lua_mgr->remove_package(dpp, y, package_name);
}
namespace bp = boost::process;
int list_packages(const DoutPrefixProvider *dpp, rgw::sal::Driver* driver, optional_yield y, packages_t& packages)
{
auto lua_mgr = driver->get_lua_manager();
return lua_mgr->list_packages(dpp, y, packages);
}
int install_packages(const DoutPrefixProvider *dpp, rgw::sal::Driver* driver,
optional_yield y, const std::string& luarocks_path,
packages_t& failed_packages, std::string& output) {
// luarocks directory cleanup
std::error_code ec;
if (std::filesystem::remove_all(luarocks_path, ec)
== static_cast<std::uintmax_t>(-1) &&
ec != std::errc::no_such_file_or_directory) {
output.append("failed to clear luarock directory: ");
output.append(ec.message());
output.append("\n");
return ec.value();
}
packages_t packages;
auto ret = list_packages(dpp, driver, y, packages);
if (ret == -ENOENT) {
// allowlist is empty
return 0;
}
if (ret < 0) {
return ret;
}
// verify that luarocks exists
const auto p = bp::search_path("luarocks");
if (p.empty()) {
return -ECHILD;
}
// the lua rocks install dir will be created by luarocks the first time it is called
for (const auto& package : packages) {
bp::ipstream is;
const auto cmd = p.string() + " install --lua-version " + CEPH_LUA_VERSION + " --tree " + luarocks_path + " --deps-mode one " + package;
bp::child c(cmd, bp::std_in.close(), (bp::std_err & bp::std_out) > is);
// once package reload is supported, code should yield when reading output
std::string line = std::string("CMD: ") + cmd;
do {
if (!line.empty()) {
output.append(line);
output.append("\n");
}
} while (c.running() && std::getline(is, line));
c.wait();
if (c.exit_code()) {
failed_packages.insert(package);
}
}
return 0;
}
#endif
}
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