libhv/hmain.cpp.tmpl

#include "h.h"

#include "hmain.h"
main_ctx_t g_main_ctx;

static int create_pidfile();
static void delete_pidfile();
static pid_t getpid_from_pidfile();

int create_pidfile() {
    FILE* fp = fopen(g_main_ctx.pidfile, "w");
    if (fp == NULL) {
        printf("fopen [%s] error: %d\n", g_main_ctx.pidfile, errno);
        return -10;
    }

    char pid[16] = {0};
    snprintf(pid, sizeof(pid), "%d\n", g_main_ctx.pid);
    fwrite(pid, 1, strlen(pid), fp);
    fclose(fp);

    atexit(delete_pidfile);

    return 0;
}

void delete_pidfile() {
    remove(g_main_ctx.pidfile);
}

pid_t getpid_from_pidfile() {
    FILE* fp = fopen(g_main_ctx.pidfile, "r");
    if (fp == NULL) {
        //printf("fopen [%s] error: %d\n", g_conf_ctx.pidfile, errno);
        return -1;
    }
    char pid[64];
    int readbytes = fread(pid, 1, sizeof(pid), fp);
    if (readbytes <= 0) {
        printf("fread [%s] bytes=%d\n", g_main_ctx.pidfile, readbytes);
        return -1;
    }
    return atoi(pid);
}

int main_ctx_init(int argc, char** argv) {
    g_main_ctx.pid = getpid();
    char* cwd = getcwd(g_main_ctx.run_path, sizeof(g_main_ctx.run_path));
    if (cwd == NULL) {
        printf("getcwd error\n");
    }
    //printf("run_path=%s\n", g_main_ctx.run_path);
    const char* b = argv[0];
    const char* e = b;
    while (*e) ++e;
    --e;
    while (e >= b) {
        if (*e == '/' || *e == '\\') {
            break;
        }
        --e;
    }
    strncpy(g_main_ctx.program_name, e+1, sizeof(g_main_ctx.program_name));
    //printf("program_name=%s\n", g_main_ctx.program_name);

    // save arg
    int i = 0;
    g_main_ctx.os_argv = argv;
    g_main_ctx.argc = 0;
    g_main_ctx.arg_len = 0;
    for (i = 0; argv[i]; ++i) {
        g_main_ctx.arg_len += strlen(argv[i]) + 1;
    }
    g_main_ctx.argc = i;
    char* argp = (char*)malloc(g_main_ctx.arg_len);
    memset(argp, 0, g_main_ctx.arg_len);
    g_main_ctx.save_argv = (char**)malloc((g_main_ctx.argc+1) * sizeof(char*));
    for (i = 0; argv[i]; ++i) {
        g_main_ctx.save_argv[i] = argp;
        strcpy(g_main_ctx.save_argv[i], argv[i]);
        argp += strlen(argv[i]) + 1;
    }
    g_main_ctx.save_argv[g_main_ctx.argc] = NULL;

    // save env
    g_main_ctx.os_envp = environ;
    g_main_ctx.envc = 0;
    g_main_ctx.env_len = 0;
    for (i = 0; environ[i]; ++i) {
        g_main_ctx.env_len += strlen(environ[i]) + 1;
    }
    g_main_ctx.envc = i;
    char* envp = (char*)malloc(g_main_ctx.env_len);
    memset(envp, 0, g_main_ctx.env_len);
    g_main_ctx.save_envp = (char**)malloc((g_main_ctx.envc+1) * sizeof(char*));
    for (i = 0; environ[i]; ++i) {
        g_main_ctx.save_envp[i] = envp;
        strcpy(g_main_ctx.save_envp[i], environ[i]);
        envp += strlen(environ[i]) + 1;
    }
    g_main_ctx.save_envp[g_main_ctx.envc] = NULL;

    // parse env
    for (i = 0; environ[i]; ++i) {
        char* b = environ[i];
        char* delim = strchr(b, '=');
        if (delim == NULL) {
            continue;
        }
        g_main_ctx.env_kv[std::string(b, delim-b)] = std::string(delim+1);
    }

    /*
    // print argv and envp
    printf("---------------arg------------------------------\n");
    for (auto& pair : g_main_ctx.arg_kv) {
        printf("%s=%s\n", pair.first.c_str(), pair.second.c_str());
    }
    printf("---------------env------------------------------\n");
    for (auto& pair : g_main_ctx.env_kv) {
        printf("%s=%s\n", pair.first.c_str(), pair.second.c_str());
    }

    printf("PWD=%s\n", get_env("PWD"));
    printf("USER=%s\n", get_env("USER"));
    printf("HOME=%s\n", get_env("HOME"));
    printf("LANG=%s\n", get_env("LANG"));
    printf("TERM=%s\n", get_env("TERM"));
    printf("SHELL=%s\n", get_env("SHELL"));
    printf("================================================\n");
    */

    char logpath[MAX_PATH] = {0};
    snprintf(logpath, sizeof(logpath), "%s/logs", g_main_ctx.run_path);
    MKDIR(logpath);
    snprintf(g_main_ctx.confile, sizeof(g_main_ctx.confile), "%s/etc/%s.conf", g_main_ctx.run_path, g_main_ctx.program_name);
    snprintf(g_main_ctx.pidfile, sizeof(g_main_ctx.pidfile), "%s/logs/%s.pid", g_main_ctx.run_path, g_main_ctx.program_name);
    snprintf(g_main_ctx.logfile, sizeof(g_main_ctx.confile), "%s/logs/%s.log", g_main_ctx.run_path, g_main_ctx.program_name);
    g_main_ctx.confile_parser = NULL;

    g_main_ctx.oldpid = getpid_from_pidfile();
    create_pidfile();

    return 0;
}

const char* get_arg(const char* key) {
    auto iter = g_main_ctx.arg_kv.find(key);
    if (iter == g_main_ctx.arg_kv.end()) {
        return NULL;
    }
    return iter->second.c_str();
}

const char* get_env(const char* key) {
    auto iter = g_main_ctx.env_kv.find(key);
    if (iter == g_main_ctx.env_kv.end()) {
        return NULL;
    }
    return iter->second.c_str();
}

#ifdef __unix__
/*
 * memory layout
 * argv[0]\0argv[1]\0argv[n]\0env[0]\0env[1]\0env[n]\0
 */
void setproctitle(const char* title) {
    //printf("proctitle=%s\n", title);
    memset(g_main_ctx.os_argv[0], 0, g_main_ctx.arg_len + g_main_ctx.env_len);
    strncpy(g_main_ctx.os_argv[0], title, g_main_ctx.arg_len + g_main_ctx.env_len);
}
#endif

// unix short style
static char options[] = "hvc:td";
static char detail_options[] = "\
-h              : print help\n\
-v              : print version\n\
-c  confile     : set configure file, default etc/${program}.conf\n\
-t              : test configure file and exit\n\
-d              : daemon\n\
";

void print_version() {
    printf("%s version %s\n", g_main_ctx.program_name, get_compile_version());
}

void print_help() {
    printf("Usage: %s [%s]\n", g_main_ctx.program_name, options);
    printf("Options:\n%s\n", detail_options);
}

#define INVALID_OPTION  -1
#define FLAG_OPTION     1
#define PARMA_OPTION    2
int get_option(char opt) {
    char* p = options;
    while (*p && *p != opt) ++p;
    if (*p == '\0')     return INVALID_OPTION;
    if (*(p+1) == ':')  return PARMA_OPTION;
    return FLAG_OPTION;
}

int parse_cmdline(int argc, char** argv) {
    int i = 1;
    while (argv[i]) {
        char* p = argv[i];
        if (*p != '-') {
            printf("Invalid argv[%d]: %s\n", i, argv[i]);
            exit(-10);
        }
        while (*++p) {
            switch (get_option(*p)) {
            case INVALID_OPTION:
                printf("Invalid option: '%c'\n", *p);
                exit(-20);
            case FLAG_OPTION:
                g_main_ctx.arg_kv[std::string(p, 1)] = "true";
                break;
            case PARMA_OPTION:
                if (*(p+1) != '\0') {
                    g_main_ctx.arg_kv[std::string(p, 1)] = p+1;
                    ++i;
                    goto next_option;
                } else if (argv[i+1] != NULL) {
                    g_main_ctx.arg_kv[std::string(p, 1)] = argv[i+1];
                    i += 2;
                    goto next_option;
                } else {
                    printf("Option '%c' requires param\n", *p);
                    exit(-30);
                }
            }
        }
        ++i;
next_option:
        continue;
    }
    return 0;
}

int main(int argc, char** argv) {
    main_ctx_init(argc, argv);

    parse_cmdline(argc, argv);

/*
#ifdef __unix__
    char proctitle[256] = {0};
    snprintf(proctitle, sizeof(proctitle), "%s: master process", g_main_ctx.program_name);
    setproctitle(proctitle);
#endif
*/

    if (get_arg("h")) {
        print_help();
        exit(0);
    }

    if (get_arg("v")) {
        print_version();
        exit(0);
    }

    const char* confile = get_arg("c");
    if (confile) {
        strncpy(g_main_ctx.confile, confile, sizeof(g_main_ctx.confile));
    }

    //printf("load confile [%s]\n", g_conf_ctx.confile);

    if (get_arg("t")) {
        exit(0);
    }

#ifdef __unix__
    if (get_arg("d")) {
        // nochdir, noclose
        int ret = daemon(1, 1);
        if (ret != 0) {
            printf("daemon error: %d\n", ret);
            exit(-10);
        }
    }
#endif

    hlog_set_file(g_main_ctx.logfile);
    hlog_set_level(LOG_LEVEL_DEBUG);
    hlogi("version: %s", get_compile_version());

    // add code below

    return 0;
}