cworker/cworker.c

/*
 *
 * Copyright 2023 Oleg Borodin  <borodin@unix7.org>
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <unistd.h>

#include <cllexer.h>
#include <clparser.h>
#include <cflexer.h>
#include <cfparser.h>
#include <massert.h>
#include <rcache.h>

#include <config.h>
#include <cworker.h>
#include <logger.h>

int log_fd = 0;

static int cworker_readconf(cworker_t* worker) {
    log_debug("reading configiration");

    int conf_fd = -1;
    if ((conf_fd = open(srv_configpath, O_RDONLY)) < 0) {
        log_error("cannot open config file %s", srv_configpath);
        return -1;
    }

    rcache_t cache;
    cflexer_t lexer;
    cfparser_t parser;

    rcache_init(&cache, conf_fd);
    cflexer_init(&lexer, &cache);
    cfparser_init(&parser, &lexer);

    if (cfparser_parse(&parser) < 0) {
        log_error("parse config error\n");
        return -1;
    }

    cfparser_bind(&parser, CFVALTYPE_INT, "port", (void *)&(worker->port));

    cfparser_destroy(&parser);
    cflexer_destroy(&lexer);
    rcache_destroy(&cache);

    return 0;
}

static int cworker_readopts(cworker_t* worker, char** argv, int argc) {
    log_debug("reading options");

    cllexer_t lexer;
    clparser_t parser;

    cllexer_init(&lexer);
    clparser_init(&parser, &lexer);

    clparser_bind(&parser, CLVALTYPE_INT, "port", (void *)&(worker->port));

    if (clparser_parse(&parser, &argv[1], argc - 1) < 0) {
        log_error("parse args error");
        return -1;
    }

    return 0;
}

static int cworker_openlog(cworker_t* worker) {
    log_debug("redirect output");

    if ((log_fd = open(srv_logpath, O_WRONLY|O_APPEND|O_CREAT, S_IRUSR|S_IWUSR|S_IRGRP)) < 0) {
        log_error("open log file error %s %s", strerror(errno), srv_logpath);
        return -1;
    }
    dup2(log_fd, STDOUT_FILENO);
    dup2(log_fd, STDERR_FILENO);

    return 0;
}

int cworker_writepid(cworker_t* worker) {
    log_debug("write pid file");
    int pid_fd = -1;
    if ((pid_fd = open(srv_runpath, O_WRONLY|O_TRUNC|O_CREAT, S_IRUSR|S_IWUSR|S_IRGRP)) < 0) {
        log_error("open pid file error %s %s", strerror(errno), srv_runpath);
        return -1;
    }
    if (dprintf(pid_fd, "%d", getpid()) < 0) {
        log_error("cannon write pid, error %s %s", strerror(errno), srv_runpath);
        close(pid_fd);
        return -1;
    }
    close(pid_fd);
    return 0;
}

const int64_t default_port = 9701;

int cworker_init(cworker_t* worker, char** argv, int argc) {
    if (cworker_openlog(worker) < 0) {
        log_error("openlog error");
        return -1;
    }
    log_debug("init service");
    worker->port = default_port;

    if (cworker_readconf(worker) < 0) {
        log_error("reading config error");
        return -1;
    }

    if (cworker_readopts(worker, argv, argc) < 0) {
        log_error("reading config error");
        return -1;
    }

    log_debug("port: %d", worker->port);

    return 0;
}

int cworker_detach(cworker_t* worker) {
    log_debug("detach service");

    int childpid = -1;
    if((childpid = fork()) < 0) {
        log_error("fork error: %s", strerror(errno));
        return -1;
    }

    if (childpid == 0) {
        // child
    } else {
        // parent
        int status = 0;
        waitpid(childpid, &status, 0);
        exit(0);
    }
    return 0;
}

int cworker_build(cworker_t* worker) {
    log_debug("build service");
    return 0;
}

int cworker_run(cworker_t* worker) {
    log_debug("run service");
    return 0;
}