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Diffstat (limited to 'src/util.cpp')
-rw-r--r-- | src/util.cpp | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/src/util.cpp b/src/util.cpp new file mode 100644 index 0000000..8ce908d --- /dev/null +++ b/src/util.cpp @@ -0,0 +1,244 @@ +/** + * Copyright (c) 2018 Cornell University. + * + * Author: Ted Yin <[email protected]> + * + * Permission is hereby granted, free of charge, to any person obtaining a copy of + * this software and associated documentation files (the "Software"), to deal in + * the Software without restriction, including without limitation the rights to + * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies + * of the Software, and to permit persons to whom the Software is furnished to do + * so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in all + * copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include <cstdarg> +#include <cstring> +#include <cassert> +#include <cstdio> +#include <ctime> +#include <sys/time.h> +#include <cmath> +#include <event2/event.h> + +#include "salticidae/util.h" + +namespace salticidae { + +void sec2tv(double t, struct timeval &tv) { + tv.tv_sec = trunc(t); + tv.tv_usec = trunc((t - tv.tv_sec) * 1e6); +} + +void event_add_with_timeout(struct event *ev, double timeout) { + struct timeval tv; + tv.tv_sec = trunc(timeout); + tv.tv_usec = trunc((timeout - tv.tv_sec) * 1e6); + event_add(ev, &tv); +} + +const std::string get_current_datetime() { + /* credit: http://stackoverflow.com/a/41381479/544806 */ + char fmt[64], buf[64]; + struct timeval tv; + gettimeofday(&tv, nullptr); + struct tm *tmp = localtime(&tv.tv_sec); + strftime(fmt, sizeof fmt, "%Y-%m-%d %H:%M:%S.%%06u", tmp); + snprintf(buf, sizeof buf, fmt, tv.tv_usec); + return std::string(buf); +} + +SalticidaeError::SalticidaeError() : msg("unknown") {} + +SalticidaeError::SalticidaeError(const std::string &fmt, ...) { + size_t guessed_size = 128; + std::string buff; + va_list ap; + for (;;) + { + buff.resize(guessed_size); + va_start(ap, fmt); + int nwrote = vsnprintf((char *)buff.data(), guessed_size, fmt.c_str(), ap); + if (nwrote < 0 || nwrote == guessed_size) + { + guessed_size <<= 1; + continue; + } + buff.resize(nwrote); + msg = std::move(buff); + break; + } +} + +SalticidaeError::operator std::string() const { + return msg; +} + +void Logger::write(const char *tag, const char *fmt, va_list ap) { + fprintf(output, "%s [%s] ", get_current_datetime().c_str(), tag); + vfprintf(output, fmt, ap); + fprintf(output, "\n"); +} + +void Logger::debug(const char *fmt, ...) { + va_list ap; + va_start(ap, fmt); + write("debug", fmt, ap); + va_end(ap); +} + +void Logger::info(const char *fmt, ...) { + va_list ap; + va_start(ap, fmt); + write("salticidae info", fmt, ap); + va_end(ap); +} + +void Logger::warning(const char *fmt, ...) { + va_list ap; + va_start(ap, fmt); + write("salticidae warn", fmt, ap); + va_end(ap); +} +void Logger::error(const char *fmt, ...) { + va_list ap; + va_start(ap, fmt); + write("salticida error", fmt, ap); + va_end(ap); +} + +Logger logger; + +void ElapsedTime::start() { + struct timezone tz; + gettimeofday(&t0, &tz); + cpu_t0 = clock(); +} + +void ElapsedTime::stop(bool show_info) { + struct timeval t1; + struct timezone tz; + gettimeofday(&t1, &tz); + cpu_elapsed_sec = (float)clock() / CLOCKS_PER_SEC - + (float)cpu_t0 / CLOCKS_PER_SEC; + elapsed_sec = (t1.tv_sec + t1.tv_usec * 1e-6) - + (t0.tv_sec + t0.tv_usec * 1e-6); + if (show_info) + SALTICIDAE_LOG_INFO("elapsed: %.3f (wall) %.3f (cpu)", + elapsed_sec, cpu_elapsed_sec); +} + +Config::Opt::Opt(const std::string &optname, OptVal *optval, Action action, int idx): \ + optname(optname), optval(optval), action(action) { + opt.name = this->optname.c_str(); + opt.has_arg = action == SWITCH_ON ? no_argument : required_argument; + opt.flag = nullptr; + opt.val = idx; +} + +void Config::add_opt(const std::string &optname, OptVal *optval, Action action) { + if (conf.count(optname)) + throw SalticidaeError("option name already exists"); + auto it = conf.insert( + std::make_pair(optname, + Opt(optname, optval, action, getopt_order.size()))).first; + getopt_order.push_back(&it->second); +} + +std::string trim(const std::string &str, + const std::string &space = "\t\r\n ") { + const auto new_begin = str.find_first_not_of(space); + if (new_begin == std::string::npos) + return ""; + const auto new_end = str.find_last_not_of(space); + return str.substr(new_begin, new_end - new_begin + 1); +} + +void Config::update(Opt &p, const char *optval) { + switch (p.action) + { + case SWITCH_ON: p.optval->switch_on(); break; + case SET_VAL: p.optval->set_val(optval); break; + case APPEND: p.optval->append(optval); break; + default: + throw SalticidaeError("unknown action"); + } +} + +void Config::update(const std::string &optname, const char *optval) { + assert(conf.count(optname)); + update(conf.find(optname)->second, optval); +} + +bool Config::load(const std::string &fname) { + static const size_t BUFF_SIZE = 1024; + FILE *conf_f = fopen(fname.c_str(), "r"); + char buff[BUFF_SIZE]; + /* load configuration from file */ + if (conf_f) + { + while (fgets(buff, BUFF_SIZE, conf_f)) + { + if (strlen(buff) == BUFF_SIZE - 1) + { + fclose(conf_f); + throw SalticidaeError("configuration file line too long"); + } + std::string line(buff); + size_t pos = line.find("="); + if (pos == std::string::npos) + continue; + std::string optname = trim(line.substr(0, pos)); + std::string optval = trim(line.substr(pos + 1)); + if (!conf.count(optname)) + { + SALTICIDAE_LOG_WARN("ignoring option name in conf file: %s", + optname.c_str()); + continue; + } + update(optname, optval.c_str()); + } + return true; + } + else + return false; +} + +size_t Config::parse(int argc, char **argv) { + if (load(conf_fname)) + SALTICIDAE_LOG_INFO("loaded configuration from %s", conf_fname.c_str()); + + size_t nopts = getopt_order.size(); + struct option *longopts = (struct option *)malloc( + sizeof(struct option) * (nopts + 1)); + int ind; + for (size_t i = 0; i < nopts; i++) + longopts[i] = getopt_order[i]->opt; + longopts[nopts] = {0, 0, 0, 0}; + for (;;) + { + int id = getopt_long(argc, argv, "", longopts, &ind); + if (id == -1 || id == '?') break; + update(*getopt_order[id], optarg); + if (id == conf_idx) + { + if (load(conf_fname)) + SALTICIDAE_LOG_INFO("load configuration from %s", conf_fname.c_str()); + else + SALTICIDAE_LOG_INFO("configuration file %s not found", conf_fname.c_str()); + } + } + return optind; +} + +} |