src/server/daemon/configmanager.c

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2013 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>

#include "../public/nsapi.h"

#include "../ucx/string.h"

#include "httplistener.h"
#include "log.h"
#include "configmanager.h"

static ServerConfiguration *current_config = NULL;
static time_t sc_last_modified = 0;

static UcxMap *config_files;

static conf_global_vars_s global_vars;

void init_configuration_manager() {
    /* init parser */
    init_server_config_parser();

    config_files = ucx_map_new(16);
}

NSAPI_PUBLIC conf_global_vars_s* conf_getglobals() {
    return &global_vars;
}

void cfgmgr_attach_file(ConfigFile *cf) {
    ucx_map_sstr_put(config_files, cf->file, cf);
}

ConfigFile* cfgmgr_get_file(sstr_t name) {
    return ucx_map_sstr_get(config_files, name);
}

// copy functions
static void* copy_listener(HttpListener *ls, ServerConfiguration *cfg) {
    /*
     * we reuse the old listener, but change the
     * ServerConfiguration and VirtualServer
     */
    http_listener_ref(ls);
    
    // TODO: this is non atomar
    sstr_t vsname = ls->default_vs.vs->name;
    ls->default_vs.vs = ucx_map_sstr_get(cfg->host_vs, vsname);
    ls->cfg = cfg;
    
    return ls;
}

static void* copy_vs(void *vserver, void *pool) {
    VirtualServer *vs = vs_copy(vserver, pool);
    
    /*
     * this function is executed on configuration reload, so some
     * VS configs may be changed
     * 
     * vs
     *    objects
     */
    ConfigFile *objectfile = cfgmgr_get_file(vs->objectfile);
    vs->objects = objectfile->data;
    return vs;
}

int cfgmgr_reload_file(ConfigFile *f, ServerConfiguration *conf, int *reload) {
    struct stat s;
    if(stat(f->file.ptr, &s) != 0) {
        fprintf(
                stderr,
                "Error: Cannot get stat of file %s\n", f->file.ptr);
        perror("cfgmgr_load_config: stat");
        return -1;
    }
    
    //printf("1 time: %d - %d\n", f->last_modified, s.st_mtim.tv_sec);
    if(f->last_modified != s.st_mtime) {
        /* reload the file */
        printf("reload: %s\n", f->file.ptr);
        log_ereport(
                LOG_INFORM,
                "reload configuration file: %s",
                f->file.ptr);
        f->reload(f, conf);
        f->last_modified = s.st_mtime;
        if(reload) {
            *reload = 1;
        }
    }
    return 0;
}

int cfgmgr_load_config() {
    int cfgreload = 0;
    
    /* check config files */  
    UcxMapIterator iter = ucx_map_iterator(config_files);
    ConfigFile *f;
    UCX_MAP_FOREACH(f, iter) {
        if(cfgmgr_reload_file(f, current_config, &cfgreload) == -1) {
            return -1;
        }
    }

    struct stat s;
    if(stat("config/server.conf", &s) != 0) {
        perror("stat(\"config/server.conf\")");
        return -1;
    }

    ServerConfiguration *config;
    //if(sc_last_modified != s.st_mtim.tv_sec) {
    if(cfgreload || !current_config) {
        printf("cfgmgr load server.conf\n");
        config = load_server_conf(
            current_config,
            "config/server.conf");

        if(config == NULL) {
            fprintf(stderr, "Cannot load server.conf\n");
            return -1;
        }
        
        sc_last_modified = s.st_mtime;
    } else if(0) {
        /* copy configuration */
        printf("cfgmgr copy server.conf\n");
        
        /* TODO: copy */
        /*
        config = load_server_conf(
            current_config,
            "config/server.conf");
        */
        config = malloc(sizeof(ServerConfiguration));
        config->ref = 1;
        config->pool = pool_create();
        config->user = sstrdup_pool(config->pool, current_config->user);
        config->tmp = sstrdup_pool(config->pool, current_config->tmp);
        
        // copy configuration
        config->host_vs = ucx_map_clone(
                current_config->host_vs,
                copy_vs,
                config->pool);
        
        config->listeners = ucx_list_clone(
                current_config->listeners,
                (copy_func)copy_listener,
                config);
        
        // TODO: we need to get the mime map from the configfile data
        config->mimetypes = current_config->mimetypes;
        
        if(config == NULL) {
            fprintf(stderr, "Cannot load server.conf\n");
            return -1;
        }

    } else {
        printf("no reconfig required!\n");
        config = current_config;
    }
    
    ServerConfiguration *old_conf = NULL;
    if(current_config != config) {
        old_conf = current_config;
    }
    current_config = config;
    if(old_conf) {
        cfg_unref(old_conf);
    }
    return 0;
}

ServerConfiguration *cfgmgr_get_server_config() {
    //cfg_ref(current_config);
    return current_config;
}