Adding upstream version 1.12.0.upstream/1.12.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 744 insertions, 0 deletions

diff --git a/database/rrdhost.c b/database/rrdhost.c
new file mode 100644
index 0000000..7234db9
--- /dev/null
+++ b/database/rrdhost.c
@@ -0,0 +1,744 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#define NETDATA_RRD_INTERNALS
+#include "rrd.h"
+
+RRDHOST *localhost = NULL;
+size_t rrd_hosts_available = 0;
+netdata_rwlock_t rrd_rwlock = NETDATA_RWLOCK_INITIALIZER;
+
+time_t rrdset_free_obsolete_time = 3600;
+time_t rrdhost_free_orphan_time = 3600;
+
+// ----------------------------------------------------------------------------
+// RRDHOST index
+
+int rrdhost_compare(void* a, void* b) {
+    if(((RRDHOST *)a)->hash_machine_guid < ((RRDHOST *)b)->hash_machine_guid) return -1;
+    else if(((RRDHOST *)a)->hash_machine_guid > ((RRDHOST *)b)->hash_machine_guid) return 1;
+    else return strcmp(((RRDHOST *)a)->machine_guid, ((RRDHOST *)b)->machine_guid);
+}
+
+avl_tree_lock rrdhost_root_index = {
+        .avl_tree = { NULL, rrdhost_compare },
+        .rwlock = AVL_LOCK_INITIALIZER
+};
+
+RRDHOST *rrdhost_find_by_guid(const char *guid, uint32_t hash) {
+    debug(D_RRDHOST, "Searching in index for host with guid '%s'", guid);
+
+    RRDHOST tmp;
+    strncpyz(tmp.machine_guid, guid, GUID_LEN);
+    tmp.hash_machine_guid = (hash)?hash:simple_hash(tmp.machine_guid);
+
+    return (RRDHOST *)avl_search_lock(&(rrdhost_root_index), (avl *) &tmp);
+}
+
+RRDHOST *rrdhost_find_by_hostname(const char *hostname, uint32_t hash) {
+    if(unlikely(!strcmp(hostname, "localhost")))
+        return localhost;
+
+    if(unlikely(!hash)) hash = simple_hash(hostname);
+
+    rrd_rdlock();
+    RRDHOST *host;
+    rrdhost_foreach_read(host) {
+        if(unlikely((hash == host->hash_hostname && !strcmp(hostname, host->hostname)))) {
+            rrd_unlock();
+            return host;
+        }
+    }
+    rrd_unlock();
+
+    return NULL;
+}
+
+#define rrdhost_index_add(rrdhost) (RRDHOST *)avl_insert_lock(&(rrdhost_root_index), (avl *)(rrdhost))
+#define rrdhost_index_del(rrdhost) (RRDHOST *)avl_remove_lock(&(rrdhost_root_index), (avl *)(rrdhost))
+
+
+// ----------------------------------------------------------------------------
+// RRDHOST - internal helpers
+
+static inline void rrdhost_init_tags(RRDHOST *host, const char *tags) {
+    if(host->tags && tags && !strcmp(host->tags, tags))
+        return;
+
+    void *old = (void *)host->tags;
+    host->tags = (tags && *tags)?strdupz(tags):NULL;
+    freez(old);
+}
+
+static inline void rrdhost_init_hostname(RRDHOST *host, const char *hostname) {
+    if(host->hostname && hostname && !strcmp(host->hostname, hostname))
+        return;
+
+    void *old = host->hostname;
+    host->hostname = strdupz(hostname?hostname:"localhost");
+    host->hash_hostname = simple_hash(host->hostname);
+    freez(old);
+}
+
+static inline void rrdhost_init_os(RRDHOST *host, const char *os) {
+    if(host->os && os && !strcmp(host->os, os))
+        return;
+
+    void *old = (void *)host->os;
+    host->os = strdupz(os?os:"unknown");
+    freez(old);
+}
+
+static inline void rrdhost_init_timezone(RRDHOST *host, const char *timezone) {
+    if(host->timezone && timezone && !strcmp(host->timezone, timezone))
+        return;
+
+    void *old = (void *)host->timezone;
+    host->timezone = strdupz((timezone && *timezone)?timezone:"unknown");
+    freez(old);
+}
+
+static inline void rrdhost_init_machine_guid(RRDHOST *host, const char *machine_guid) {
+    strncpy(host->machine_guid, machine_guid, GUID_LEN);
+    host->machine_guid[GUID_LEN] = '\0';
+    host->hash_machine_guid = simple_hash(host->machine_guid);
+}
+
+// ----------------------------------------------------------------------------
+// RRDHOST - add a host
+
+RRDHOST *rrdhost_create(const char *hostname,
+                        const char *registry_hostname,
+                        const char *guid,
+                        const char *os,
+                        const char *timezone,
+                        const char *tags,
+                        const char *program_name,
+                        const char *program_version,
+                        int update_every,
+                        long entries,
+                        RRD_MEMORY_MODE memory_mode,
+                        unsigned int health_enabled,
+                        unsigned int rrdpush_enabled,
+                        char *rrdpush_destination,
+                        char *rrdpush_api_key,
+                        char *rrdpush_send_charts_matching,
+                        int is_localhost
+) {
+    debug(D_RRDHOST, "Host '%s': adding with guid '%s'", hostname, guid);
+
+    rrd_check_wrlock();
+
+    RRDHOST *host = callocz(1, sizeof(RRDHOST));
+
+    host->rrd_update_every    = (update_every > 0)?update_every:1;
+    host->rrd_history_entries = align_entries_to_pagesize(memory_mode, entries);
+    host->rrd_memory_mode     = memory_mode;
+    host->health_enabled      = (memory_mode == RRD_MEMORY_MODE_NONE)? 0 : health_enabled;
+    host->rrdpush_send_enabled     = (rrdpush_enabled && rrdpush_destination && *rrdpush_destination && rrdpush_api_key && *rrdpush_api_key) ? 1 : 0;
+    host->rrdpush_send_destination = (host->rrdpush_send_enabled)?strdupz(rrdpush_destination):NULL;
+    host->rrdpush_send_api_key     = (host->rrdpush_send_enabled)?strdupz(rrdpush_api_key):NULL;
+    host->rrdpush_send_charts_matching = simple_pattern_create(rrdpush_send_charts_matching, NULL, SIMPLE_PATTERN_EXACT);
+
+    host->rrdpush_sender_pipe[0] = -1;
+    host->rrdpush_sender_pipe[1] = -1;
+    host->rrdpush_sender_socket  = -1;
+
+    netdata_mutex_init(&host->rrdpush_sender_buffer_mutex);
+    netdata_rwlock_init(&host->rrdhost_rwlock);
+
+    rrdhost_init_hostname(host, hostname);
+    rrdhost_init_machine_guid(host, guid);
+
+    rrdhost_init_os(host, os);
+    rrdhost_init_timezone(host, timezone);
+    rrdhost_init_tags(host, tags);
+
+    host->program_name = strdupz((program_name && *program_name)?program_name:"unknown");
+    host->program_version = strdupz((program_version && *program_version)?program_version:"unknown");
+    host->registry_hostname = strdupz((registry_hostname && *registry_hostname)?registry_hostname:hostname);
+
+    avl_init_lock(&(host->rrdset_root_index),      rrdset_compare);
+    avl_init_lock(&(host->rrdset_root_index_name), rrdset_compare_name);
+    avl_init_lock(&(host->rrdfamily_root_index),   rrdfamily_compare);
+    avl_init_lock(&(host->rrdvar_root_index),   rrdvar_compare);
+
+    if(config_get_boolean(CONFIG_SECTION_GLOBAL, "delete obsolete charts files", 1))
+        rrdhost_flag_set(host, RRDHOST_FLAG_DELETE_OBSOLETE_CHARTS);
+
+    if(config_get_boolean(CONFIG_SECTION_GLOBAL, "delete orphan hosts files", 1) && !is_localhost)
+        rrdhost_flag_set(host, RRDHOST_FLAG_DELETE_ORPHAN_HOST);
+
+
+    // ------------------------------------------------------------------------
+    // initialize health variables
+
+    host->health_log.next_log_id = 1;
+    host->health_log.next_alarm_id = 1;
+    host->health_log.max = 1000;
+    host->health_log.next_log_id =
+    host->health_log.next_alarm_id = (uint32_t)now_realtime_sec();
+
+    long n = config_get_number(CONFIG_SECTION_HEALTH, "in memory max health log entries", host->health_log.max);
+    if(n < 10) {
+        error("Host '%s': health configuration has invalid max log entries %ld. Using default %u", host->hostname, n, host->health_log.max);
+        config_set_number(CONFIG_SECTION_HEALTH, "in memory max health log entries", (long)host->health_log.max);
+    }
+    else
+        host->health_log.max = (unsigned int)n;
+
+    netdata_rwlock_init(&host->health_log.alarm_log_rwlock);
+
+    char filename[FILENAME_MAX + 1];
+
+    if(is_localhost) {
+
+        host->cache_dir  = strdupz(netdata_configured_cache_dir);
+        host->varlib_dir = strdupz(netdata_configured_varlib_dir);
+
+    }
+    else {
+        // this is not localhost - append our GUID to localhost path
+
+        snprintfz(filename, FILENAME_MAX, "%s/%s", netdata_configured_cache_dir, host->machine_guid);
+        host->cache_dir = strdupz(filename);
+
+        if(host->rrd_memory_mode == RRD_MEMORY_MODE_MAP || host->rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
+            int r = mkdir(host->cache_dir, 0775);
+            if(r != 0 && errno != EEXIST)
+                error("Host '%s': cannot create directory '%s'", host->hostname, host->cache_dir);
+        }
+
+        snprintfz(filename, FILENAME_MAX, "%s/%s", netdata_configured_varlib_dir, host->machine_guid);
+        host->varlib_dir = strdupz(filename);
+
+        if(host->health_enabled) {
+            int r = mkdir(host->varlib_dir, 0775);
+            if(r != 0 && errno != EEXIST)
+                error("Host '%s': cannot create directory '%s'", host->hostname, host->varlib_dir);
+       }
+
+    }
+
+    if(host->health_enabled) {
+        snprintfz(filename, FILENAME_MAX, "%s/health", host->varlib_dir);
+        int r = mkdir(filename, 0775);
+        if(r != 0 && errno != EEXIST)
+            error("Host '%s': cannot create directory '%s'", host->hostname, filename);
+    }
+
+    snprintfz(filename, FILENAME_MAX, "%s/health/health-log.db", host->varlib_dir);
+    host->health_log_filename = strdupz(filename);
+
+    snprintfz(filename, FILENAME_MAX, "%s/alarm-notify.sh", netdata_configured_plugins_dir);
+    host->health_default_exec = strdupz(config_get(CONFIG_SECTION_HEALTH, "script to execute on alarm", filename));
+    host->health_default_recipient = strdupz("root");
+
+
+    // ------------------------------------------------------------------------
+    // load health configuration
+
+    if(host->health_enabled) {
+        health_alarm_log_load(host);
+        health_alarm_log_open(host);
+
+        rrdhost_wrlock(host);
+        health_readdir(host, health_user_config_dir(), health_stock_config_dir(), NULL);
+        rrdhost_unlock(host);
+    }
+
+
+    // ------------------------------------------------------------------------
+    // link it and add it to the index
+
+    if(is_localhost) {
+        host->next = localhost;
+        localhost = host;
+    }
+    else {
+        if(localhost) {
+            host->next = localhost->next;
+            localhost->next = host;
+        }
+        else localhost = host;
+    }
+
+    RRDHOST *t = rrdhost_index_add(host);
+
+    if(t != host) {
+        error("Host '%s': cannot add host with machine guid '%s' to index. It already exists as host '%s' with machine guid '%s'.", host->hostname, host->machine_guid, t->hostname, t->machine_guid);
+        rrdhost_free(host);
+        host = NULL;
+    }
+    else {
+        info("Host '%s' (at registry as '%s') with guid '%s' initialized"
+                     ", os '%s'"
+                     ", timezone '%s'"
+                     ", tags '%s'"
+                     ", program_name '%s'"
+                     ", program_version '%s'"
+                     ", update every %d"
+                     ", memory mode %s"
+                     ", history entries %ld"
+                     ", streaming %s"
+                     " (to '%s' with api key '%s')"
+                     ", health %s"
+                     ", cache_dir '%s'"
+                     ", varlib_dir '%s'"
+                     ", health_log '%s'"
+                     ", alarms default handler '%s'"
+                     ", alarms default recipient '%s'"
+             , host->hostname
+             , host->registry_hostname
+             , host->machine_guid
+             , host->os
+             , host->timezone
+             , (host->tags)?host->tags:""
+             , host->program_name
+             , host->program_version
+             , host->rrd_update_every
+             , rrd_memory_mode_name(host->rrd_memory_mode)
+             , host->rrd_history_entries
+             , host->rrdpush_send_enabled?"enabled":"disabled"
+             , host->rrdpush_send_destination?host->rrdpush_send_destination:""
+             , host->rrdpush_send_api_key?host->rrdpush_send_api_key:""
+             , host->health_enabled?"enabled":"disabled"
+             , host->cache_dir
+             , host->varlib_dir
+             , host->health_log_filename
+             , host->health_default_exec
+             , host->health_default_recipient
+        );
+    }
+
+    rrd_hosts_available++;
+
+    return host;
+}
+
+RRDHOST *rrdhost_find_or_create(
+          const char *hostname
+        , const char *registry_hostname
+        , const char *guid
+        , const char *os
+        , const char *timezone
+        , const char *tags
+        , const char *program_name
+        , const char *program_version
+        , int update_every
+        , long history
+        , RRD_MEMORY_MODE mode
+        , unsigned int health_enabled
+        , unsigned int rrdpush_enabled
+        , char *rrdpush_destination
+        , char *rrdpush_api_key
+        , char *rrdpush_send_charts_matching
+) {
+    debug(D_RRDHOST, "Searching for host '%s' with guid '%s'", hostname, guid);
+
+    rrd_wrlock();
+    RRDHOST *host = rrdhost_find_by_guid(guid, 0);
+    if(!host) {
+        host = rrdhost_create(
+                hostname
+                , registry_hostname
+                , guid
+                , os
+                , timezone
+                , tags
+                , program_name
+                , program_version
+                , update_every
+                , history
+                , mode
+                , health_enabled
+                , rrdpush_enabled
+                , rrdpush_destination
+                , rrdpush_api_key
+                , rrdpush_send_charts_matching
+                , 0
+        );
+    }
+    else {
+        host->health_enabled = health_enabled;
+
+        if(strcmp(host->hostname, hostname) != 0) {
+            info("Host '%s' has been renamed to '%s'. If this is not intentional it may mean multiple hosts are using the same machine_guid.", host->hostname, hostname);
+            char *t = host->hostname;
+            host->hostname = strdupz(hostname);
+            host->hash_hostname = simple_hash(host->hostname);
+            freez(t);
+        }
+
+        if(strcmp(host->program_name, program_name) != 0) {
+            info("Host '%s' switched program name from '%s' to '%s'", host->hostname, host->program_name, program_name);
+            char *t = host->program_name;
+            host->program_name = strdupz(program_name);
+            freez(t);
+        }
+
+        if(strcmp(host->program_version, program_version) != 0) {
+            info("Host '%s' switched program version from '%s' to '%s'", host->hostname, host->program_version, program_version);
+            char *t = host->program_version;
+            host->program_version = strdupz(program_version);
+            freez(t);
+        }
+
+        if(host->rrd_update_every != update_every)
+            error("Host '%s' has an update frequency of %d seconds, but the wanted one is %d seconds. Restart netdata here to apply the new settings.", host->hostname, host->rrd_update_every, update_every);
+
+        if(host->rrd_history_entries < history)
+            error("Host '%s' has history of %ld entries, but the wanted one is %ld entries. Restart netdata here to apply the new settings.", host->hostname, host->rrd_history_entries, history);
+
+        if(host->rrd_memory_mode != mode)
+            error("Host '%s' has memory mode '%s', but the wanted one is '%s'. Restart netdata here to apply the new settings.", host->hostname, rrd_memory_mode_name(host->rrd_memory_mode), rrd_memory_mode_name(mode));
+
+        // update host tags
+        rrdhost_init_tags(host, tags);
+    }
+
+    rrdhost_cleanup_orphan_hosts_nolock(host);
+
+    rrd_unlock();
+
+    return host;
+}
+
+inline int rrdhost_should_be_removed(RRDHOST *host, RRDHOST *protected, time_t now) {
+    if(host != protected
+       && host != localhost
+       && rrdhost_flag_check(host, RRDHOST_FLAG_ORPHAN)
+       && !host->connected_senders
+       && host->senders_disconnected_time
+       && host->senders_disconnected_time + rrdhost_free_orphan_time < now)
+        return 1;
+
+    return 0;
+}
+
+void rrdhost_cleanup_orphan_hosts_nolock(RRDHOST *protected) {
+    time_t now = now_realtime_sec();
+
+    RRDHOST *host;
+
+restart_after_removal:
+    rrdhost_foreach_write(host) {
+        if(rrdhost_should_be_removed(host, protected, now)) {
+            info("Host '%s' with machine guid '%s' is obsolete - cleaning up.", host->hostname, host->machine_guid);
+
+            if(rrdhost_flag_check(host, RRDHOST_FLAG_DELETE_ORPHAN_HOST))
+                rrdhost_delete_charts(host);
+            else
+                rrdhost_save_charts(host);
+
+            rrdhost_free(host);
+            goto restart_after_removal;
+        }
+    }
+}
+
+// ----------------------------------------------------------------------------
+// RRDHOST global / startup initialization
+
+void rrd_init(char *hostname) {
+    rrdset_free_obsolete_time = config_get_number(CONFIG_SECTION_GLOBAL, "cleanup obsolete charts after seconds", rrdset_free_obsolete_time);
+    gap_when_lost_iterations_above = (int)config_get_number(CONFIG_SECTION_GLOBAL, "gap when lost iterations above", gap_when_lost_iterations_above);
+    if (gap_when_lost_iterations_above < 1)
+        gap_when_lost_iterations_above = 1;
+
+    health_init();
+    registry_init();
+    rrdpush_init();
+
+    debug(D_RRDHOST, "Initializing localhost with hostname '%s'", hostname);
+    rrd_wrlock();
+    localhost = rrdhost_create(
+            hostname
+            , registry_get_this_machine_hostname()
+            , registry_get_this_machine_guid()
+            , os_type
+            , netdata_configured_timezone
+            , config_get(CONFIG_SECTION_BACKEND, "host tags", "")
+            , program_name
+            , program_version
+            , default_rrd_update_every
+            , default_rrd_history_entries
+            , default_rrd_memory_mode
+            , default_health_enabled
+            , default_rrdpush_enabled
+            , default_rrdpush_destination
+            , default_rrdpush_api_key
+            , default_rrdpush_send_charts_matching
+            , 1
+    );
+    rrd_unlock();
+	web_client_api_v1_management_init();
+}
+
+// ----------------------------------------------------------------------------
+// RRDHOST - lock validations
+// there are only used when NETDATA_INTERNAL_CHECKS is set
+
+void __rrdhost_check_rdlock(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
+    debug(D_RRDHOST, "Checking read lock on host '%s'", host->hostname);
+
+    int ret = netdata_rwlock_trywrlock(&host->rrdhost_rwlock);
+    if(ret == 0)
+        fatal("RRDHOST '%s' should be read-locked, but it is not, at function %s() at line %lu of file '%s'", host->hostname, function, line, file);
+}
+
+void __rrdhost_check_wrlock(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
+    debug(D_RRDHOST, "Checking write lock on host '%s'", host->hostname);
+
+    int ret = netdata_rwlock_tryrdlock(&host->rrdhost_rwlock);
+    if(ret == 0)
+        fatal("RRDHOST '%s' should be write-locked, but it is not, at function %s() at line %lu of file '%s'", host->hostname, function, line, file);
+}
+
+void __rrd_check_rdlock(const char *file, const char *function, const unsigned long line) {
+    debug(D_RRDHOST, "Checking read lock on all RRDs");
+
+    int ret = netdata_rwlock_trywrlock(&rrd_rwlock);
+    if(ret == 0)
+        fatal("RRDs should be read-locked, but it are not, at function %s() at line %lu of file '%s'", function, line, file);
+}
+
+void __rrd_check_wrlock(const char *file, const char *function, const unsigned long line) {
+    debug(D_RRDHOST, "Checking write lock on all RRDs");
+
+    int ret = netdata_rwlock_tryrdlock(&rrd_rwlock);
+    if(ret == 0)
+        fatal("RRDs should be write-locked, but it are not, at function %s() at line %lu of file '%s'", function, line, file);
+}
+
+// ----------------------------------------------------------------------------
+// RRDHOST - free
+
+void rrdhost_free(RRDHOST *host) {
+    if(!host) return;
+
+    info("Freeing all memory for host '%s'...", host->hostname);
+
+    rrd_check_wrlock();     // make sure the RRDs are write locked
+
+    // stop a possibly running thread
+    rrdpush_sender_thread_stop(host);
+
+    rrdhost_wrlock(host);   // lock this RRDHOST
+
+    // ------------------------------------------------------------------------
+    // release its children resources
+
+    while(host->rrdset_root)
+        rrdset_free(host->rrdset_root);
+
+    while(host->alarms)
+        rrdcalc_unlink_and_free(host, host->alarms);
+
+    while(host->templates)
+        rrdcalctemplate_unlink_and_free(host, host->templates);
+
+    debug(D_RRD_CALLS, "RRDHOST: Cleaning up remaining host variables for host '%s'", host->hostname);
+    rrdvar_free_remaining_variables(host, &host->rrdvar_root_index);
+
+    health_alarm_log_free(host);
+
+    // ------------------------------------------------------------------------
+    // remove it from the indexes
+
+    if(rrdhost_index_del(host) != host)
+        error("RRDHOST '%s' removed from index, deleted the wrong entry.", host->hostname);
+
+
+    // ------------------------------------------------------------------------
+    // unlink it from the host
+
+    if(host == localhost) {
+        localhost = host->next;
+    }
+    else {
+        // find the previous one
+        RRDHOST *h;
+        for(h = localhost; h && h->next != host ; h = h->next) ;
+
+        // bypass it
+        if(h) h->next = host->next;
+        else error("Request to free RRDHOST '%s': cannot find it", host->hostname);
+    }
+
+    // ------------------------------------------------------------------------
+    // free it
+
+    freez((void *)host->tags);
+    freez((void *)host->os);
+    freez((void *)host->timezone);
+    freez(host->program_version);
+    freez(host->program_name);
+    freez(host->cache_dir);
+    freez(host->varlib_dir);
+    freez(host->rrdpush_send_api_key);
+    freez(host->rrdpush_send_destination);
+    freez(host->health_default_exec);
+    freez(host->health_default_recipient);
+    freez(host->health_log_filename);
+    freez(host->hostname);
+    freez(host->registry_hostname);
+    simple_pattern_free(host->rrdpush_send_charts_matching);
+    rrdhost_unlock(host);
+    netdata_rwlock_destroy(&host->health_log.alarm_log_rwlock);
+    netdata_rwlock_destroy(&host->rrdhost_rwlock);
+    freez(host);
+
+    rrd_hosts_available--;
+}
+
+void rrdhost_free_all(void) {
+    rrd_wrlock();
+    while(localhost) rrdhost_free(localhost);
+    rrd_unlock();
+}
+
+// ----------------------------------------------------------------------------
+// RRDHOST - save host files
+
+void rrdhost_save_charts(RRDHOST *host) {
+    if(!host) return;
+
+    info("Saving/Closing database of host '%s'...", host->hostname);
+
+    RRDSET *st;
+
+    // we get a write lock
+    // to ensure only one thread is saving the database
+    rrdhost_wrlock(host);
+
+    rrdset_foreach_write(st, host) {
+        rrdset_rdlock(st);
+        rrdset_save(st);
+        rrdset_unlock(st);
+    }
+
+    rrdhost_unlock(host);
+}
+
+// ----------------------------------------------------------------------------
+// RRDHOST - delete host files
+
+void rrdhost_delete_charts(RRDHOST *host) {
+    if(!host) return;
+
+    info("Deleting database of host '%s'...", host->hostname);
+
+    RRDSET *st;
+
+    // we get a write lock
+    // to ensure only one thread is saving the database
+    rrdhost_wrlock(host);
+
+    rrdset_foreach_write(st, host) {
+        rrdset_rdlock(st);
+        rrdset_delete(st);
+        rrdset_unlock(st);
+    }
+
+    recursively_delete_dir(host->cache_dir, "left over host");
+
+    rrdhost_unlock(host);
+}
+
+// ----------------------------------------------------------------------------
+// RRDHOST - cleanup host files
+
+void rrdhost_cleanup_charts(RRDHOST *host) {
+    if(!host) return;
+
+    info("Cleaning up database of host '%s'...", host->hostname);
+
+    RRDSET *st;
+    uint32_t rrdhost_delete_obsolete_charts = rrdhost_flag_check(host, RRDHOST_FLAG_DELETE_OBSOLETE_CHARTS);
+
+    // we get a write lock
+    // to ensure only one thread is saving the database
+    rrdhost_wrlock(host);
+
+    rrdset_foreach_write(st, host) {
+        rrdset_rdlock(st);
+
+        if(rrdhost_delete_obsolete_charts && rrdset_flag_check(st, RRDSET_FLAG_OBSOLETE))
+            rrdset_delete(st);
+        else
+            rrdset_save(st);
+
+        rrdset_unlock(st);
+    }
+
+    rrdhost_unlock(host);
+}
+
+
+// ----------------------------------------------------------------------------
+// RRDHOST - save all hosts to disk
+
+void rrdhost_save_all(void) {
+    info("Saving database [%zu hosts(s)]...", rrd_hosts_available);
+
+    rrd_rdlock();
+
+    RRDHOST *host;
+    rrdhost_foreach_read(host)
+        rrdhost_save_charts(host);
+
+    rrd_unlock();
+}
+
+// ----------------------------------------------------------------------------
+// RRDHOST - save or delete all hosts from disk
+
+void rrdhost_cleanup_all(void) {
+    info("Cleaning up database [%zu hosts(s)]...", rrd_hosts_available);
+
+    rrd_rdlock();
+
+    RRDHOST *host;
+    rrdhost_foreach_read(host) {
+        if(host != localhost && rrdhost_flag_check(host, RRDHOST_FLAG_DELETE_OBSOLETE_CHARTS) && !host->connected_senders)
+            rrdhost_delete_charts(host);
+        else
+            rrdhost_cleanup_charts(host);
+    }
+
+    rrd_unlock();
+}
+
+
+// ----------------------------------------------------------------------------
+// RRDHOST - save or delete all the host charts from disk
+
+void rrdhost_cleanup_obsolete_charts(RRDHOST *host) {
+    time_t now = now_realtime_sec();
+
+    RRDSET *st;
+
+    uint32_t rrdhost_delete_obsolete_charts = rrdhost_flag_check(host, RRDHOST_FLAG_DELETE_OBSOLETE_CHARTS);
+
+restart_after_removal:
+    rrdset_foreach_write(st, host) {
+        if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_OBSOLETE)
+                    && st->last_accessed_time + rrdset_free_obsolete_time < now
+                    && st->last_updated.tv_sec + rrdset_free_obsolete_time < now
+                    && st->last_collected_time.tv_sec + rrdset_free_obsolete_time < now
+        )) {
+
+            rrdset_rdlock(st);
+
+            if(rrdhost_delete_obsolete_charts)
+                rrdset_delete(st);
+            else
+                rrdset_save(st);
+
+            rrdset_unlock(st);
+
+            rrdset_free(st);
+            goto restart_after_removal;
+        }
+    }
+}