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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "dirconfig.hpp"
#include <vespa/vespalib/util/exceptions.h>
#include <vespa/vespalib/util/stringfmt.h>
#include <filesystem>
#include <fstream>
#include <atomic>
#include <cassert>
#include <vespa/log/log.h>
LOG_SETUP(".dirconfig");
namespace vdstestlib {
// When we start up first time, remove old config from the directories
// we're using
namespace {
class Root {
public:
Root() :
_nextDir(0)
{
memset(_dirname, 0, sizeof(_dirname));
snprintf(_dirname, sizeof(_dirname), "dirconfig.tmp.XXXXXX");
char * realName = mkdtemp(_dirname);
assert(realName == _dirname);
assert(strlen(realName) < sizeof(_dirname));
(void) realName;
}
~Root() {
if (system((std::string("rm -rf ") + _dirname).c_str()) != 0) {
abort();
}
}
std::string nextDir() {
char name[64];
uint32_t id = _nextDir++;
snprintf(name, sizeof(name), "%s/%u", _dirname, id);
return name;
}
private:
std::string dir() const { return _dirname; }
char _dirname[32];
std::atomic<uint32_t> _nextDir;
};
Root _G_root;
}
DirConfig::Config::Config(const ConfigName& name)
: defFileName(name),
config(),
dirtyCache(false)
{
}
DirConfig::Config::~Config() {}
void
DirConfig::Config::set(const ConfigKey& key)
{
set(key, "");
}
void
DirConfig::Config::set(const ConfigKey& key, const ConfigValue& value)
{
for (std::list<std::pair<ConfigKey, ConfigValue> >::iterator it
= config.begin(); it != config.end(); ++it)
{
if (it->first == key) {
if (it->second == value) return;
dirtyCache = true;
it->second = value;
return;
}
}
dirtyCache = true;
config.push_back(std::pair<ConfigKey, ConfigValue>(key, value));
}
void
DirConfig::Config::remove(const ConfigKey& key)
{
for (std::list<std::pair<ConfigKey, ConfigValue> >::iterator it
= config.begin(); it != config.end(); ++it)
{
if (it->first == key) {
dirtyCache = true;
config.erase(it);
return;
}
}
}
const DirConfig::ConfigValue*
DirConfig::Config::get(const ConfigKey& key) const
{
for (std::list<std::pair<ConfigKey, ConfigValue> >::const_iterator it
= config.begin(); it != config.end(); ++it)
{
if (it->first == key) {
return &it->second;
}
}
return 0;
}
DirConfig::DirConfig()
: _configs(),
_dirName(_G_root.nextDir())
{
std::filesystem::create_directories(std::filesystem::path(_dirName));
}
DirConfig::~DirConfig() {}
DirConfig::Config&
DirConfig::addConfig(const ConfigName& name)
{
std::pair<std::map<ConfigName, Config>::iterator, bool> result
= _configs.insert(
std::map<ConfigName, Config>::value_type(name, Config(name)));
if (!result.second) {
throw vespalib::IllegalArgumentException(
"There is already a config named " + name, VESPA_STRLOC);
}
return result.first->second;
}
DirConfig::Config&
DirConfig::getConfig(const ConfigName& name, bool createIfNonExisting)
{
std::map<ConfigName, Config>::iterator it(_configs.find(name));
if (it == _configs.end()) {
if (createIfNonExisting) {
return addConfig(name);
}
throw vespalib::IllegalArgumentException(
"No config named " + name, VESPA_STRLOC);
}
return it->second;
}
void
DirConfig::removeConfig(const ConfigName& name)
{
_configs.erase(name);
}
void
DirConfig::publish() const
{
for (std::map<ConfigName, Config>::const_iterator it = _configs.begin();
it != _configs.end(); ++it)
{
std::string filename = _dirName + "/" + it->first + ".cfg";
std::ofstream out(filename.c_str());
for (std::list<std::pair<ConfigKey, ConfigValue> >::const_iterator i
= it->second.config.begin(); i != it->second.config.end(); ++i)
{
if (i->second.size() > 0) {
out << i->first << " " << i->second << "\n";
} else {
out << i->first << "\n";
}
}
out.close();
LOG(debug, "Wrote config file %s.", filename.c_str());
it->second.dirtyCache = false;
}
}
std::string
DirConfig::getConfigId() const
{
// Users are likely to set up config and then give config ids to users.
// This is thus a good place to automatically publish changes so users
// dont need to call publish manually
if (isCacheDirty()) {
LOG(debug, "Cache dirty in getConfigId(). Writing config files.");
publish();
}
return "dir:" + _dirName;
}
bool
DirConfig::isCacheDirty() const
{
for (std::map<ConfigName, Config>::const_iterator it = _configs.begin();
it != _configs.end(); ++it)
{
if (it->second.dirtyCache) return true;
}
return false;
}
template void DirConfig::Config::setValue(const ConfigKey &, const int &);
template std::string DirConfig::Config::getValue(const ConfigKey &, const std::string &) const;
} // storage
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