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netdata/registry/registry_db.c

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// SPDX-License-Identifier: GPL-3.0-or-later
#include "daemon/common.h"
#include "registry_internals.h"
int registry_db_should_be_saved(void) {
debug(D_REGISTRY, "log entries %llu, max %llu", registry.log_count, registry.save_registry_every_entries);
return registry.log_count > registry.save_registry_every_entries;
}
// ----------------------------------------------------------------------------
// INTERNAL FUNCTIONS FOR SAVING REGISTRY OBJECTS
static int registry_machine_save_url(const DICTIONARY_ITEM *item __maybe_unused, void *entry, void *file) {
REGISTRY_MACHINE_URL *mu = entry;
FILE *fp = file;
debug(D_REGISTRY, "Registry: registry_machine_save_url('%s')", mu->url->url);
int ret = fprintf(fp, "V\t%08x\t%08x\t%08x\t%02x\t%s\n",
mu->first_t,
mu->last_t,
mu->usages,
mu->flags,
mu->url->url
);
// error handling is done at registry_db_save()
return ret;
}
static int registry_machine_save(const DICTIONARY_ITEM *item __maybe_unused, void *entry, void *file) {
REGISTRY_MACHINE *m = entry;
FILE *fp = file;
debug(D_REGISTRY, "Registry: registry_machine_save('%s')", m->guid);
int ret = fprintf(fp, "M\t%08x\t%08x\t%08x\t%s\n",
m->first_t,
m->last_t,
m->usages,
m->guid
);
if(ret >= 0) {
int ret2 = dictionary_walkthrough_read(m->machine_urls, registry_machine_save_url, fp);
if(ret2 < 0) return ret2;
ret += ret2;
}
// error handling is done at registry_db_save()
return ret;
}
static inline int registry_person_save_url(void *entry, void *file) {
REGISTRY_PERSON_URL *pu = entry;
FILE *fp = file;
debug(D_REGISTRY, "Registry: registry_person_save_url('%s')", pu->url->url);
int ret = fprintf(fp, "U\t%08x\t%08x\t%08x\t%02x\t%s\t%s\t%s\n",
pu->first_t,
pu->last_t,
pu->usages,
pu->flags,
pu->machine->guid,
pu->machine_name,
pu->url->url
);
// error handling is done at registry_db_save()
return ret;
}
static inline int registry_person_save(const DICTIONARY_ITEM *item __maybe_unused, void *entry, void *file) {
REGISTRY_PERSON *p = entry;
FILE *fp = file;
debug(D_REGISTRY, "Registry: registry_person_save('%s')", p->guid);
int ret = fprintf(fp, "P\t%08x\t%08x\t%08x\t%s\n",
p->first_t,
p->last_t,
p->usages,
p->guid
);
if(ret >= 0) {
//int ret2 = dictionary_walkthrough_read(p->person_urls, registry_person_save_url, fp);
int ret2 = avl_traverse(&p->person_urls, registry_person_save_url, fp);
if (ret2 < 0) return ret2;
ret += ret2;
}
// error handling is done at registry_db_save()
return ret;
}
// ----------------------------------------------------------------------------
// SAVE THE REGISTRY DATABASE
int registry_db_save(void) {
if(unlikely(!registry.enabled))
return -1;
if(unlikely(!registry_db_should_be_saved()))
return -2;
error_log_limit_unlimited();
char tmp_filename[FILENAME_MAX + 1];
char old_filename[FILENAME_MAX + 1];
snprintfz(old_filename, FILENAME_MAX, "%s.old", registry.db_filename);
snprintfz(tmp_filename, FILENAME_MAX, "%s.tmp", registry.db_filename);
debug(D_REGISTRY, "Registry: Creating file '%s'", tmp_filename);
FILE *fp = fopen(tmp_filename, "w");
if(!fp) {
error("Registry: Cannot create file: %s", tmp_filename);
error_log_limit_reset();
return -1;
}
// dictionary_walkthrough_read() has its own locking, so this is safe to do
debug(D_REGISTRY, "Saving all machines");
int bytes1 = dictionary_walkthrough_read(registry.machines, registry_machine_save, fp);
if(bytes1 < 0) {
error("Registry: Cannot save registry machines - return value %d", bytes1);
fclose(fp);
error_log_limit_reset();
return bytes1;
}
debug(D_REGISTRY, "Registry: saving machines took %d bytes", bytes1);
debug(D_REGISTRY, "Saving all persons");
int bytes2 = dictionary_walkthrough_read(registry.persons, registry_person_save, fp);
if(bytes2 < 0) {
error("Registry: Cannot save registry persons - return value %d", bytes2);
fclose(fp);
error_log_limit_reset();
return bytes2;
}
debug(D_REGISTRY, "Registry: saving persons took %d bytes", bytes2);
// save the totals
fprintf(fp, "T\t%016llx\t%016llx\t%016llx\t%016llx\t%016llx\t%016llx\n",
registry.persons_count,
registry.machines_count,
registry.usages_count + 1, // this is required - it is lost on db rotation
registry.urls_count,
registry.persons_urls_count,
registry.machines_urls_count
);
fclose(fp);
errno = 0;
// remove the .old db
debug(D_REGISTRY, "Registry: Removing old db '%s'", old_filename);
if(unlink(old_filename) == -1 && errno != ENOENT)
error("Registry: cannot remove old registry file '%s'", old_filename);
// rename the db to .old
debug(D_REGISTRY, "Registry: Link current db '%s' to .old: '%s'", registry.db_filename, old_filename);
if(link(registry.db_filename, old_filename) == -1 && errno != ENOENT)
error("Registry: cannot move file '%s' to '%s'. Saving registry DB failed!", registry.db_filename, old_filename);
else {
// remove the database (it is saved in .old)
debug(D_REGISTRY, "Registry: removing db '%s'", registry.db_filename);
if (unlink(registry.db_filename) == -1 && errno != ENOENT)
error("Registry: cannot remove old registry file '%s'", registry.db_filename);
// move the .tmp to make it active
debug(D_REGISTRY, "Registry: linking tmp db '%s' to active db '%s'", tmp_filename, registry.db_filename);
if (link(tmp_filename, registry.db_filename) == -1) {
error("Registry: cannot move file '%s' to '%s'. Saving registry DB failed!", tmp_filename,
registry.db_filename);
// move the .old back
debug(D_REGISTRY, "Registry: linking old db '%s' to active db '%s'", old_filename, registry.db_filename);
if(link(old_filename, registry.db_filename) == -1)
error("Registry: cannot move file '%s' to '%s'. Recovering the old registry DB failed!", old_filename, registry.db_filename);
}
else {
debug(D_REGISTRY, "Registry: removing tmp db '%s'", tmp_filename);
if(unlink(tmp_filename) == -1)
error("Registry: cannot remove tmp registry file '%s'", tmp_filename);
// it has been moved successfully
// discard the current registry log
registry_log_recreate();
registry.log_count = 0;
}
}
// continue operations
error_log_limit_reset();
return -1;
}
// ----------------------------------------------------------------------------
// LOAD THE REGISTRY DATABASE
size_t registry_db_load(void) {
char *s, buf[4096 + 1];
REGISTRY_PERSON *p = NULL;
REGISTRY_MACHINE *m = NULL;
REGISTRY_URL *u = NULL;
size_t line = 0;
debug(D_REGISTRY, "Registry: loading active db from: '%s'", registry.db_filename);
FILE *fp = fopen(registry.db_filename, "r");
if(!fp) {
error("Registry: cannot open registry file: '%s'", registry.db_filename);
return 0;
}
size_t len = 0;
buf[4096] = '\0';
while((s = fgets_trim_len(buf, 4096, fp, &len))) {
line++;
debug(D_REGISTRY, "Registry: read line %zu to length %zu: %s", line, len, s);
switch(*s) {
case 'T': // totals
if(unlikely(len != 103 || s[1] != '\t' || s[18] != '\t' || s[35] != '\t' || s[52] != '\t' || s[69] != '\t' || s[86] != '\t' || s[103] != '\0')) {
error("Registry totals line %zu is wrong (len = %zu).", line, len);
continue;
}
registry.persons_count = strtoull(&s[2], NULL, 16);
registry.machines_count = strtoull(&s[19], NULL, 16);
registry.usages_count = strtoull(&s[36], NULL, 16);
registry.urls_count = strtoull(&s[53], NULL, 16);
registry.persons_urls_count = strtoull(&s[70], NULL, 16);
registry.machines_urls_count = strtoull(&s[87], NULL, 16);
break;
case 'P': // person
m = NULL;
// verify it is valid
if(unlikely(len != 65 || s[1] != '\t' || s[10] != '\t' || s[19] != '\t' || s[28] != '\t' || s[65] != '\0')) {
error("Registry person line %zu is wrong (len = %zu).", line, len);
continue;
}
s[1] = s[10] = s[19] = s[28] = '\0';
p = registry_person_allocate(&s[29], strtoul(&s[2], NULL, 16));
p->last_t = (uint32_t)strtoul(&s[11], NULL, 16);
p->usages = (uint32_t)strtoul(&s[20], NULL, 16);
debug(D_REGISTRY, "Registry loaded person '%s', first: %u, last: %u, usages: %u", p->guid, p->first_t, p->last_t, p->usages);
break;
case 'M': // machine
p = NULL;
// verify it is valid
if(unlikely(len != 65 || s[1] != '\t' || s[10] != '\t' || s[19] != '\t' || s[28] != '\t' || s[65] != '\0')) {
error("Registry person line %zu is wrong (len = %zu).", line, len);
continue;
}
s[1] = s[10] = s[19] = s[28] = '\0';
m = registry_machine_allocate(&s[29], strtoul(&s[2], NULL, 16));
m->last_t = (uint32_t)strtoul(&s[11], NULL, 16);
m->usages = (uint32_t)strtoul(&s[20], NULL, 16);
debug(D_REGISTRY, "Registry loaded machine '%s', first: %u, last: %u, usages: %u", m->guid, m->first_t, m->last_t, m->usages);
break;
case 'U': // person URL
if(unlikely(!p)) {
error("Registry: ignoring line %zu, no person loaded: %s", line, s);
continue;
}
// verify it is valid
if(len < 69 || s[1] != '\t' || s[10] != '\t' || s[19] != '\t' || s[28] != '\t' || s[31] != '\t' || s[68] != '\t') {
error("Registry person URL line %zu is wrong (len = %zu).", line, len);
continue;
}
s[1] = s[10] = s[19] = s[28] = s[31] = s[68] = '\0';
// skip the name to find the url
char *url = &s[69];
while(*url && *url != '\t') url++;
if(!*url) {
error("Registry person URL line %zu does not have a url.", line);
continue;
}
*url++ = '\0';
// u = registry_url_allocate_nolock(url, strlen(url));
u = registry_url_get(url, strlen(url));
time_t first_t = strtoul(&s[2], NULL, 16);
m = registry_machine_find(&s[32]);
if(!m) m = registry_machine_allocate(&s[32], first_t);
REGISTRY_PERSON_URL *pu = registry_person_url_allocate(p, m, u, &s[69], strlen(&s[69]), first_t);
pu->last_t = (uint32_t)strtoul(&s[11], NULL, 16);
pu->usages = (uint32_t)strtoul(&s[20], NULL, 16);
pu->flags = (uint8_t)strtoul(&s[29], NULL, 16);
debug(D_REGISTRY, "Registry loaded person URL '%s' with name '%s' of machine '%s', first: %u, last: %u, usages: %u, flags: %02x", u->url, pu->machine_name, m->guid, pu->first_t, pu->last_t, pu->usages, pu->flags);
break;
case 'V': // machine URL
if(unlikely(!m)) {
error("Registry: ignoring line %zu, no machine loaded: %s", line, s);
continue;
}
// verify it is valid
if(len < 32 || s[1] != '\t' || s[10] != '\t' || s[19] != '\t' || s[28] != '\t' || s[31] != '\t') {
error("Registry person URL line %zu is wrong (len = %zu).", line, len);
continue;
}
s[1] = s[10] = s[19] = s[28] = s[31] = '\0';
// u = registry_url_allocate_nolock(&s[32], strlen(&s[32]));
u = registry_url_get(&s[32], strlen(&s[32]));
REGISTRY_MACHINE_URL *mu = registry_machine_url_allocate(m, u, strtoul(&s[2], NULL, 16));
mu->last_t = (uint32_t)strtoul(&s[11], NULL, 16);
mu->usages = (uint32_t)strtoul(&s[20], NULL, 16);
mu->flags = (uint8_t)strtoul(&s[29], NULL, 16);
debug(D_REGISTRY, "Registry loaded machine URL '%s', machine '%s', first: %u, last: %u, usages: %u, flags: %02x", u->url, m->guid, mu->first_t, mu->last_t, mu->usages, mu->flags);
break;
default:
error("Registry: ignoring line %zu of filename '%s': %s.", line, registry.db_filename, s);
break;
}
}
fclose(fp);
return line;
}
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