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#include "common.hh"
#include "config.hh"
#include "io.hh"
#include "logger.hh"
#include "strutil.hh"
#include <errno.h>
#include <fstream>
#include <string.h>
#include <unordered_map>
#include <unordered_set>
namespace {
class ConfigImpl : public Config {
public:
ConfigImpl()
: data_(), root_() {}
ConfigImpl(std::unordered_map<std::string, std::string> data,
std::filesystem::path root)
: data_(std::move(data)), root_(std::move(root)) {}
std::string_view get(std::string const& key,
std::string_view default_) const override {
auto it = data_.find(key);
if (it == data_.end())
return default_;
return it->second;
}
char const* get(std::string const& key,
char const* default_) const override {
auto it = data_.find(key);
if (it == data_.end())
return default_;
return it->second.c_str();
}
std::optional<uint64_t> get(std::string const& key, uint64_t default_)
const override {
auto* data = get(key, nullptr);
if (!data)
return default_;
return str::parse_uint64(data);
}
std::optional<uint64_t> get_size(std::string const& key, uint64_t default_)
const override {
auto* data = get(key, nullptr);
if (!data)
return default_;
char* end = nullptr;
double value = strtod(data, &end);
if (end == data)
return std::nullopt;
std::string_view suffix(end);
if (suffix == "t" || suffix == "T" || suffix == "TB" || suffix == "Tb")
return value * 1024 * 1024 * 1024 * 1024;
if (suffix == "g" || suffix == "G" || suffix == "GB" || suffix == "Gb")
return value * 1024 * 1024 * 1024;
if (suffix == "m" || suffix == "M" || suffix == "MB" || suffix == "Mb")
return value * 1024 * 1024;
if (suffix == "k" || suffix == "K" || suffix == "KB" || suffix == "Kb")
return value * 1024;
if (suffix == "b" || suffix == "B" || suffix == "")
return value;
return std::nullopt;
}
std::optional<double> get_duration(std::string const& key, double default_)
const override {
auto* data = get(key, nullptr);
if (!data)
return default_;
char* end = nullptr;
double value = strtod(data, &end);
if (end == data)
return std::nullopt;
std::string_view suffix(end);
if (suffix == "h" || suffix == "H")
return value * 60.0 * 60.0;
if (suffix == "m" || suffix == "M")
return value * 60.0;
if (suffix == "ms" || suffix == "MS")
return value / 1000.0;
if (suffix == "ns" || suffix == "NS")
return value / 1000000.0;
if (suffix == "s" || suffix == "S" || suffix == "")
return value;
return std::nullopt;
}
std::filesystem::path get_path(std::string const& key,
std::string_view default_) const override {
auto it = data_.find(key);
if (it == data_.end()) {
if (default_.empty())
return std::filesystem::path();
return root_ / default_;
}
return root_ / it->second;
}
private:
std::unordered_map<std::string, std::string> const data_;
std::filesystem::path const root_;
};
inline bool is_space(char c) {
return c == ' ' || c == '\t';
}
void trim(std::string_view str, size_t* start, size_t* end) {
while (*start < *end && is_space(str[*start]))
++*start;
while (*end > *start && is_space(str[*end - 1]))
--*end;
}
std::unique_ptr<Config> load(Logger* logger,
std::filesystem::path const& path) {
std::ifstream in(path);
if (!in.good()) {
logger->warn("Unable to open %s for reading: %s",
path.c_str(), strerror(errno));
return nullptr;
}
std::error_code err;
auto root = std::filesystem::absolute(path.parent_path(), err);
std::unordered_map<std::string, std::string> data;
std::string line;
unsigned long num = 0;
while (std::getline(in, line)) {
++num;
if (line.empty() || line.front() == '#')
continue;
auto eq = line.find('=');
if (eq == std::string::npos) {
logger->warn("%s:%lu: Invalid line, no equal sign (=).",
path.c_str(), num);
return nullptr;
}
size_t key_start = 0;
size_t key_end = eq;
trim(line, &key_start, &key_end);
if (key_start == key_end) {
logger->warn("%s:%lu: Invalid line, no key before equal sign (=).",
path.c_str(), num);
return nullptr;
}
size_t value_start = eq + 1;
size_t value_end = line.size();
trim(line, &value_start, &value_end);
auto key = line.substr(key_start, key_end - key_start);
data[key] = line.substr(value_start, value_end - value_start);
}
if (!in.eof()) {
logger->warn("Error reading %s: %s",
path.c_str(), strerror(errno));
return nullptr;
}
return Config::create(std::move(data), std::move(root));
}
} // namespace
std::unique_ptr<Config> Config::create(Logger* logger,
std::filesystem::path const& filepath) {
return load(logger, filepath);
}
std::unique_ptr<Config> Config::create(
std::unordered_map<std::string, std::string> data,
std::filesystem::path root) {
return std::make_unique<ConfigImpl>(std::move(data), std::move(root));
}
std::unique_ptr<Config> Config::create_empty() {
return std::make_unique<ConfigImpl>();
}
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