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rrdlabels.c
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rrdlabels.c
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// SPDX-License-Identifier: GPL-3.0-or-later
#define NETDATA_RRD_INTERNALS
#include "rrd.h"
// Key OF HS ARRRAY
struct {
Pvoid_t JudyHS;
SPINLOCK spinlock;
} global_labels = {
.JudyHS = (Pvoid_t) NULL,
.spinlock = NETDATA_SPINLOCK_INITIALIZER
};
typedef struct label_registry_idx {
STRING *key;
STRING *value;
} LABEL_REGISTRY_IDX;
typedef struct labels_registry_entry {
LABEL_REGISTRY_IDX index;
} RRDLABEL;
// Value of HS array
typedef struct labels_registry_idx_entry {
RRDLABEL label;
size_t refcount;
} RRDLABEL_IDX;
typedef struct rrdlabels {
SPINLOCK spinlock;
size_t version;
Pvoid_t JudyL;
} RRDLABELS;
#define lfe_start_nolock(label_list, label, ls) \
do { \
bool _first_then_next = true; \
Pvoid_t *_PValue; \
Word_t _Index = 0; \
while ((_PValue = JudyLFirstThenNext((label_list)->JudyL, &_Index, &_first_then_next))) { \
(ls) = *(RRDLABEL_SRC *)_PValue; \
(void)(ls); \
(label) = (void *)_Index;
#define lfe_done_nolock() \
} \
} \
while (0)
#define lfe_start_read(label_list, label, ls) \
do { \
spinlock_lock(&(label_list)->spinlock); \
bool _first_then_next = true; \
Pvoid_t *_PValue; \
Word_t _Index = 0; \
while ((_PValue = JudyLFirstThenNext((label_list)->JudyL, &_Index, &_first_then_next))) { \
(ls) = *(RRDLABEL_SRC *)_PValue; \
(void)(ls); \
(label) = (void *)_Index;
#define lfe_done(label_list) \
} \
spinlock_unlock(&(label_list)->spinlock); \
} \
while (0)
static inline void STATS_PLUS_MEMORY(struct dictionary_stats *stats, size_t key_size, size_t item_size, size_t value_size) {
if(key_size)
__atomic_fetch_add(&stats->memory.index, (long)JUDYHS_INDEX_SIZE_ESTIMATE(key_size), __ATOMIC_RELAXED);
if(item_size)
__atomic_fetch_add(&stats->memory.dict, (long)item_size, __ATOMIC_RELAXED);
if(value_size)
__atomic_fetch_add(&stats->memory.values, (long)value_size, __ATOMIC_RELAXED);
}
static inline void STATS_MINUS_MEMORY(struct dictionary_stats *stats, size_t key_size, size_t item_size, size_t value_size) {
if(key_size)
__atomic_fetch_sub(&stats->memory.index, (long)JUDYHS_INDEX_SIZE_ESTIMATE(key_size), __ATOMIC_RELAXED);
if(item_size)
__atomic_fetch_sub(&stats->memory.dict, (long)item_size, __ATOMIC_RELAXED);
if(value_size)
__atomic_fetch_sub(&stats->memory.values, (long)value_size, __ATOMIC_RELAXED);
}
// ----------------------------------------------------------------------------
// labels sanitization
/*
* All labels follow these rules:
*
* Character Symbol Values Names
* UTF-8 characters UTF-8 yes -> _
* Lower case letter [a-z] yes yes
* Upper case letter [A-Z] yes -> [a-z]
* Digit [0-9] yes yes
* Underscore _ yes yes
* Minus - yes yes
* Plus + yes -> _
* Colon : yes -> _
* Semicolon ; -> : -> _
* Equal = -> : -> _
* Period . yes yes
* Comma , -> . -> .
* Slash / yes yes
* Backslash \ -> / -> /
* At @ yes -> _
* Space yes -> _
* Opening parenthesis ( yes -> _
* Closing parenthesis ) yes -> _
* anything else -> _ -> _
*
* The above rules should allow users to set in tags (indicative):
*
* 1. hostnames and domain names as-is
* 2. email addresses as-is
* 3. floating point numbers, converted to always use a dot as the decimal point
*
* Leading and trailing spaces and control characters are removed from both label
* names and values.
*
* Multiple spaces inside the label name or the value are removed (only 1 is retained).
* In names spaces are also converted to underscores.
*
* Names that are only underscores are rejected (they do not enter the dictionary).
*
* The above rules do not require any conversion to be included in JSON strings.
*
* Label names and values are truncated to LABELS_MAX_LENGTH (200) characters.
*
* When parsing, label key and value are separated by the first colon (:) found.
* So label:value1:value2 is parsed as key = "label", value = "value1:value2"
*
* This means a label key cannot contain a colon (:) - it is converted to
* underscore if it does.
*
*/
#define RRDLABELS_MAX_NAME_LENGTH 200
#define RRDLABELS_MAX_VALUE_LENGTH 800 // 800 in bytes, up to 200 UTF-8 characters
static unsigned char label_spaces_char_map[256];
static unsigned char label_names_char_map[256];
static unsigned char label_values_char_map[256] = {
[0] = '\0', //
[1] = '_', //
[2] = '_', //
[3] = '_', //
[4] = '_', //
[5] = '_', //
[6] = '_', //
[7] = '_', //
[8] = '_', //
[9] = '_', //
[10] = '_', //
[11] = '_', //
[12] = '_', //
[13] = '_', //
[14] = '_', //
[15] = '_', //
[16] = '_', //
[17] = '_', //
[18] = '_', //
[19] = '_', //
[20] = '_', //
[21] = '_', //
[22] = '_', //
[23] = '_', //
[24] = '_', //
[25] = '_', //
[26] = '_', //
[27] = '_', //
[28] = '_', //
[29] = '_', //
[30] = '_', //
[31] = '_', //
[32] = ' ', // SPACE keep
[33] = '_', // !
[34] = '_', // "
[35] = '_', // #
[36] = '_', // $
[37] = '_', // %
[38] = '_', // &
[39] = '_', // '
[40] = '(', // ( keep
[41] = ')', // ) keep
[42] = '_', // *
[43] = '+', // + keep
[44] = '.', // , convert , to .
[45] = '-', // - keep
[46] = '.', // . keep
[47] = '/', // / keep
[48] = '0', // 0 keep
[49] = '1', // 1 keep
[50] = '2', // 2 keep
[51] = '3', // 3 keep
[52] = '4', // 4 keep
[53] = '5', // 5 keep
[54] = '6', // 6 keep
[55] = '7', // 7 keep
[56] = '8', // 8 keep
[57] = '9', // 9 keep
[58] = ':', // : keep
[59] = ':', // ; convert ; to :
[60] = '_', // <
[61] = ':', // = convert = to :
[62] = '_', // >
[63] = '_', // ?
[64] = '@', // @
[65] = 'A', // A keep
[66] = 'B', // B keep
[67] = 'C', // C keep
[68] = 'D', // D keep
[69] = 'E', // E keep
[70] = 'F', // F keep
[71] = 'G', // G keep
[72] = 'H', // H keep
[73] = 'I', // I keep
[74] = 'J', // J keep
[75] = 'K', // K keep
[76] = 'L', // L keep
[77] = 'M', // M keep
[78] = 'N', // N keep
[79] = 'O', // O keep
[80] = 'P', // P keep
[81] = 'Q', // Q keep
[82] = 'R', // R keep
[83] = 'S', // S keep
[84] = 'T', // T keep
[85] = 'U', // U keep
[86] = 'V', // V keep
[87] = 'W', // W keep
[88] = 'X', // X keep
[89] = 'Y', // Y keep
[90] = 'Z', // Z keep
[91] = '[', // [ keep
[92] = '/', // backslash convert \ to /
[93] = ']', // ] keep
[94] = '_', // ^
[95] = '_', // _ keep
[96] = '_', // `
[97] = 'a', // a keep
[98] = 'b', // b keep
[99] = 'c', // c keep
[100] = 'd', // d keep
[101] = 'e', // e keep
[102] = 'f', // f keep
[103] = 'g', // g keep
[104] = 'h', // h keep
[105] = 'i', // i keep
[106] = 'j', // j keep
[107] = 'k', // k keep
[108] = 'l', // l keep
[109] = 'm', // m keep
[110] = 'n', // n keep
[111] = 'o', // o keep
[112] = 'p', // p keep
[113] = 'q', // q keep
[114] = 'r', // r keep
[115] = 's', // s keep
[116] = 't', // t keep
[117] = 'u', // u keep
[118] = 'v', // v keep
[119] = 'w', // w keep
[120] = 'x', // x keep
[121] = 'y', // y keep
[122] = 'z', // z keep
[123] = '_', // {
[124] = '_', // |
[125] = '_', // }
[126] = '_', // ~
[127] = '_', //
[128] = '_', //
[129] = '_', //
[130] = '_', //
[131] = '_', //
[132] = '_', //
[133] = '_', //
[134] = '_', //
[135] = '_', //
[136] = '_', //
[137] = '_', //
[138] = '_', //
[139] = '_', //
[140] = '_', //
[141] = '_', //
[142] = '_', //
[143] = '_', //
[144] = '_', //
[145] = '_', //
[146] = '_', //
[147] = '_', //
[148] = '_', //
[149] = '_', //
[150] = '_', //
[151] = '_', //
[152] = '_', //
[153] = '_', //
[154] = '_', //
[155] = '_', //
[156] = '_', //
[157] = '_', //
[158] = '_', //
[159] = '_', //
[160] = '_', //
[161] = '_', //
[162] = '_', //
[163] = '_', //
[164] = '_', //
[165] = '_', //
[166] = '_', //
[167] = '_', //
[168] = '_', //
[169] = '_', //
[170] = '_', //
[171] = '_', //
[172] = '_', //
[173] = '_', //
[174] = '_', //
[175] = '_', //
[176] = '_', //
[177] = '_', //
[178] = '_', //
[179] = '_', //
[180] = '_', //
[181] = '_', //
[182] = '_', //
[183] = '_', //
[184] = '_', //
[185] = '_', //
[186] = '_', //
[187] = '_', //
[188] = '_', //
[189] = '_', //
[190] = '_', //
[191] = '_', //
[192] = '_', //
[193] = '_', //
[194] = '_', //
[195] = '_', //
[196] = '_', //
[197] = '_', //
[198] = '_', //
[199] = '_', //
[200] = '_', //
[201] = '_', //
[202] = '_', //
[203] = '_', //
[204] = '_', //
[205] = '_', //
[206] = '_', //
[207] = '_', //
[208] = '_', //
[209] = '_', //
[210] = '_', //
[211] = '_', //
[212] = '_', //
[213] = '_', //
[214] = '_', //
[215] = '_', //
[216] = '_', //
[217] = '_', //
[218] = '_', //
[219] = '_', //
[220] = '_', //
[221] = '_', //
[222] = '_', //
[223] = '_', //
[224] = '_', //
[225] = '_', //
[226] = '_', //
[227] = '_', //
[228] = '_', //
[229] = '_', //
[230] = '_', //
[231] = '_', //
[232] = '_', //
[233] = '_', //
[234] = '_', //
[235] = '_', //
[236] = '_', //
[237] = '_', //
[238] = '_', //
[239] = '_', //
[240] = '_', //
[241] = '_', //
[242] = '_', //
[243] = '_', //
[244] = '_', //
[245] = '_', //
[246] = '_', //
[247] = '_', //
[248] = '_', //
[249] = '_', //
[250] = '_', //
[251] = '_', //
[252] = '_', //
[253] = '_', //
[254] = '_', //
[255] = '_' //
};
__attribute__((constructor)) void initialize_labels_keys_char_map(void) {
// copy the values char map to the names char map
size_t i;
for(i = 0; i < 256 ;i++)
label_names_char_map[i] = label_values_char_map[i];
// apply overrides to the label names map
label_names_char_map['A'] = 'a';
label_names_char_map['B'] = 'b';
label_names_char_map['C'] = 'c';
label_names_char_map['D'] = 'd';
label_names_char_map['E'] = 'e';
label_names_char_map['F'] = 'f';
label_names_char_map['G'] = 'g';
label_names_char_map['H'] = 'h';
label_names_char_map['I'] = 'i';
label_names_char_map['J'] = 'j';
label_names_char_map['K'] = 'k';
label_names_char_map['L'] = 'l';
label_names_char_map['M'] = 'm';
label_names_char_map['N'] = 'n';
label_names_char_map['O'] = 'o';
label_names_char_map['P'] = 'p';
label_names_char_map['Q'] = 'q';
label_names_char_map['R'] = 'r';
label_names_char_map['S'] = 's';
label_names_char_map['T'] = 't';
label_names_char_map['U'] = 'u';
label_names_char_map['V'] = 'v';
label_names_char_map['W'] = 'w';
label_names_char_map['X'] = 'x';
label_names_char_map['Y'] = 'y';
label_names_char_map['Z'] = 'z';
label_names_char_map['='] = '_';
label_names_char_map[':'] = '_';
label_names_char_map['+'] = '_';
label_names_char_map[';'] = '_';
label_names_char_map['@'] = '_';
label_names_char_map['('] = '_';
label_names_char_map[')'] = '_';
label_names_char_map[' '] = '_';
label_names_char_map['\\'] = '/';
// create the spaces map
for(i = 0; i < 256 ;i++)
label_spaces_char_map[i] = (isspace(i) || iscntrl(i) || !isprint(i))?1:0;
}
__attribute__((constructor)) void initialize_label_stats(void) {
dictionary_stats_category_rrdlabels.memory.dict = 0;
dictionary_stats_category_rrdlabels.memory.index = 0;
dictionary_stats_category_rrdlabels.memory.values = 0;
}
size_t text_sanitize(unsigned char *dst, const unsigned char *src, size_t dst_size, unsigned char *char_map, bool utf, const char *empty, size_t *multibyte_length) {
if(unlikely(!dst_size)) return 0;
if(unlikely(!src || !*src)) {
strncpyz((char *)dst, empty, dst_size);
dst[dst_size - 1] = '\0';
size_t len = strlen((char *)dst);
if(multibyte_length) *multibyte_length = len;
return len;
}
unsigned char *d = dst;
// make room for the final string termination
unsigned char *end = &d[dst_size - 1];
// copy while converting, but keep only one white space
// we start wil last_is_space = 1 to skip leading spaces
int last_is_space = 1;
size_t mblen = 0;
while(*src && d < end) {
unsigned char c = *src;
if(IS_UTF8_STARTBYTE(c) && IS_UTF8_BYTE(src[1]) && d + 2 < end) {
// UTF-8 multi-byte encoded character
// find how big this character is (2-4 bytes)
size_t utf_character_size = 2;
while(utf_character_size < 4 && src[utf_character_size] && IS_UTF8_BYTE(src[utf_character_size]) && !IS_UTF8_STARTBYTE(src[utf_character_size]))
utf_character_size++;
if(utf) {
while(utf_character_size) {
utf_character_size--;
*d++ = *src++;
}
}
else {
// UTF-8 characters are not allowed.
// Assume it is an underscore
// and skip all except the first byte
*d++ = '_';
src += (utf_character_size - 1);
}
last_is_space = 0;
mblen++;
continue;
}
if(label_spaces_char_map[c]) {
// a space character
if(!last_is_space) {
// add one space
*d++ = char_map[c];
mblen++;
}
last_is_space++;
}
else {
*d++ = char_map[c];
last_is_space = 0;
mblen++;
}
src++;
}
// remove the last trailing space
if(last_is_space && d > dst) {
d--;
mblen--;
}
// put a termination at the end of what we copied
*d = '\0';
// check if dst is all underscores and empty it if it is
if(*dst == '_') {
unsigned char *t = dst;
while (*t == '_') t++;
if (unlikely(*t == '\0')) {
*dst = '\0';
mblen = 0;
}
}
if(unlikely(*dst == '\0')) {
strncpyz((char *)dst, empty, dst_size);
dst[dst_size - 1] = '\0';
mblen = strlen((char *)dst);
if(multibyte_length) *multibyte_length = mblen;
return mblen;
}
if(multibyte_length) *multibyte_length = mblen;
return d - dst;
}
static inline size_t rrdlabels_sanitize_name(char *dst, const char *src, size_t dst_size) {
return text_sanitize((unsigned char *)dst, (const unsigned char *)src, dst_size, label_names_char_map, 0, "", NULL);
}
static inline size_t rrdlabels_sanitize_value(char *dst, const char *src, size_t dst_size) {
return text_sanitize((unsigned char *)dst, (const unsigned char *)src, dst_size, label_values_char_map, 1, "[none]", NULL);
}
// ----------------------------------------------------------------------------
// rrdlabels_create()
RRDLABELS *rrdlabels_create(void)
{
RRDLABELS *labels = callocz(1, sizeof(*labels));
STATS_PLUS_MEMORY(&dictionary_stats_category_rrdlabels, 0, sizeof(RRDLABELS), 0);
return labels;
}
static void dup_label(RRDLABEL *label_index)
{
if (!label_index)
return;
spinlock_lock(&global_labels.spinlock);
Pvoid_t *PValue = JudyHSGet(global_labels.JudyHS, (void *)label_index, sizeof(*label_index));
if (PValue && *PValue) {
RRDLABEL_IDX *rrdlabel = *PValue;
__atomic_add_fetch(&rrdlabel->refcount, 1, __ATOMIC_RELAXED);
}
spinlock_unlock(&global_labels.spinlock);
}
static RRDLABEL *add_label_name_value(const char *name, const char *value)
{
RRDLABEL_IDX *rrdlabel = NULL;
LABEL_REGISTRY_IDX label_index;
label_index.key = string_strdupz(name);
label_index.value = string_strdupz(value);
spinlock_lock(&global_labels.spinlock);
Pvoid_t *PValue = JudyHSIns(&global_labels.JudyHS, (void *)&label_index, sizeof(label_index), PJE0);
if(unlikely(!PValue || PValue == PJERR))
fatal("RRDLABELS: corrupted judyHS array");
if (*PValue) {
rrdlabel = *PValue;
string_freez(label_index.key);
string_freez(label_index.value);
} else {
rrdlabel = callocz(1, sizeof(*rrdlabel));
rrdlabel->label.index = label_index;
*PValue = rrdlabel;
STATS_PLUS_MEMORY(&dictionary_stats_category_rrdlabels, sizeof(LABEL_REGISTRY_IDX), sizeof(RRDLABEL_IDX), 0);
}
__atomic_add_fetch(&rrdlabel->refcount, 1, __ATOMIC_RELAXED);
spinlock_unlock(&global_labels.spinlock);
return &rrdlabel->label;
}
static void delete_label(RRDLABEL *label)
{
spinlock_lock(&global_labels.spinlock);
Pvoid_t *PValue = JudyHSGet(global_labels.JudyHS, &label->index, sizeof(label->index));
if (PValue && *PValue) {
RRDLABEL_IDX *rrdlabel = *PValue;
size_t refcount = __atomic_sub_fetch(&rrdlabel->refcount, 1, __ATOMIC_RELAXED);
if (refcount == 0) {
int ret = JudyHSDel(&global_labels.JudyHS, (void *)label, sizeof(*label), PJE0);
if (unlikely(ret == JERR))
STATS_MINUS_MEMORY(&dictionary_stats_category_rrdlabels, 0, sizeof(*rrdlabel), 0);
else
STATS_MINUS_MEMORY(&dictionary_stats_category_rrdlabels, sizeof(LABEL_REGISTRY_IDX), sizeof(*rrdlabel), 0);
string_freez(label->index.key);
string_freez(label->index.value);
freez(rrdlabel);
}
}
spinlock_unlock(&global_labels.spinlock);
}
// ----------------------------------------------------------------------------
// rrdlabels_destroy()
void rrdlabels_destroy(RRDLABELS *labels)
{
if (unlikely(!labels))
return;
spinlock_lock(&labels->spinlock);
Pvoid_t *PValue;
Word_t Index = 0;
bool first_then_next = true;
while ((PValue = JudyLFirstThenNext(labels->JudyL, &Index, &first_then_next))) {
delete_label((RRDLABEL *)Index);
}
size_t memory_freed = JudyLFreeArray(&labels->JudyL, PJE0);
STATS_MINUS_MEMORY(&dictionary_stats_category_rrdlabels, 0, memory_freed + sizeof(RRDLABELS), 0);
spinlock_unlock(&labels->spinlock);
freez(labels);
}
// Check in labels to see if we have the key specified in label
static RRDLABEL *rrdlabels_find_label_with_key_unsafe(RRDLABELS *labels, RRDLABEL *label)
{
if (unlikely(!labels))
return NULL;
Pvoid_t *PValue;
Word_t Index = 0;
bool first_then_next = true;
RRDLABEL *found = NULL;
while ((PValue = JudyLFirstThenNext(labels->JudyL, &Index, &first_then_next))) {
RRDLABEL *lb = (RRDLABEL *)Index;
if (lb->index.key == label->index.key) {
found = (RRDLABEL *)Index;
break;
}
}
return found;
}
// ----------------------------------------------------------------------------
// rrdlabels_add()
static void labels_add_already_sanitized(RRDLABELS *labels, const char *key, const char *value, RRDLABEL_SRC ls)
{
RRDLABEL *new_label = add_label_name_value(key, value);
spinlock_lock(&labels->spinlock);
RRDLABEL *old_label_with_key = rrdlabels_find_label_with_key_unsafe(labels, new_label);
if (old_label_with_key == new_label) {
spinlock_unlock(&labels->spinlock);
delete_label(new_label);
return;
}
size_t mem_before_judyl = JudyLMemUsed(labels->JudyL);
Pvoid_t *PValue = JudyLIns(&labels->JudyL, (Word_t)new_label, PJE0);
if (!PValue || PValue == PJERR)
fatal("RRDLABELS: corrupted labels JudyL array");
RRDLABEL_SRC new_ls = (ls & ~(RRDLABEL_FLAG_NEW | RRDLABEL_FLAG_OLD));
labels->version++;
if (old_label_with_key) {
(void)JudyLDel(&labels->JudyL, (Word_t)old_label_with_key, PJE0);
new_ls |= RRDLABEL_FLAG_OLD;
} else
new_ls |= RRDLABEL_FLAG_NEW;
*((RRDLABEL_SRC *)PValue) = new_ls;
size_t mem_after_judyl = JudyLMemUsed(labels->JudyL);
STATS_PLUS_MEMORY(&dictionary_stats_category_rrdlabels, 0, mem_after_judyl - mem_before_judyl, 0);
spinlock_unlock(&labels->spinlock);
if (old_label_with_key)
delete_label((RRDLABEL *)old_label_with_key);
}
void rrdlabels_add(RRDLABELS *labels, const char *name, const char *value, RRDLABEL_SRC ls)
{
if(!labels) {
netdata_log_error("%s(): called with NULL dictionary.", __FUNCTION__ );
return;
}
char n[RRDLABELS_MAX_NAME_LENGTH + 1], v[RRDLABELS_MAX_VALUE_LENGTH + 1];
rrdlabels_sanitize_name(n, name, RRDLABELS_MAX_NAME_LENGTH);
rrdlabels_sanitize_value(v, value, RRDLABELS_MAX_VALUE_LENGTH);
if(!*n) {
netdata_log_error("%s: cannot add name '%s' (value '%s') which is sanitized as empty string", __FUNCTION__, name, value);
return;
}
labels_add_already_sanitized(labels, n, v, ls);
}
bool rrdlabels_exist(RRDLABELS *labels, const char *key)
{
if (!labels)
return false;
STRING *this_key = string_strdupz(key);
RRDLABEL *lb;
RRDLABEL_SRC ls;
bool found = false;
lfe_start_read(labels, lb, ls)
{
if (lb->index.key == this_key) {
found = true;
break;
}
}
lfe_done(labels);
string_freez(this_key);
return found;
}
static const char *get_quoted_string_up_to(char *dst, size_t dst_size, const char *string, char upto1, char upto2) {
size_t len = 0;
char *d = dst, quote = 0;
while(*string && len++ < dst_size) {
if(unlikely(!quote && (*string == '\'' || *string == '"'))) {
quote = *string++;
continue;
}
if(unlikely(quote && *string == quote)) {
quote = 0;
string++;
continue;
}
if(unlikely(quote && *string == '\\' && string[1])) {
string++;
*d++ = *string++;
continue;
}
if(unlikely(!quote && (*string == upto1 || *string == upto2))) break;
*d++ = *string++;
}
*d = '\0';
if(*string) string++;
return string;
}
void rrdlabels_add_pair(RRDLABELS *labels, const char *string, RRDLABEL_SRC ls)
{
if(!labels) {
netdata_log_error("%s(): called with NULL dictionary.", __FUNCTION__ );
return;
}
char name[RRDLABELS_MAX_NAME_LENGTH + 1];
string = get_quoted_string_up_to(name, RRDLABELS_MAX_NAME_LENGTH, string, '=', ':');
char value[RRDLABELS_MAX_VALUE_LENGTH + 1];
get_quoted_string_up_to(value, RRDLABELS_MAX_VALUE_LENGTH, string, '\0', '\0');
rrdlabels_add(labels, name, value, ls);
}
// ----------------------------------------------------------------------------
void rrdlabels_value_to_buffer_array_item_or_null(RRDLABELS *labels, BUFFER *wb, const char *key) {
if(!labels) return;
STRING *this_key = string_strdupz(key);
RRDLABEL *lb;
RRDLABEL_SRC ls;
lfe_start_read(labels, lb, ls)
{
if (lb->index.key == this_key) {
if (lb->index.value)
buffer_json_add_array_item_string(wb, string2str(lb->index.value));
else
buffer_json_add_array_item_string(wb, NULL);
break;
}
}
lfe_done(labels);
string_freez(this_key);
}
// ----------------------------------------------------------------------------
void rrdlabels_get_value_strcpyz(RRDLABELS *labels, char *dst, size_t dst_len, const char *key) {
if(!labels) return;
STRING *this_key = string_strdupz(key);
RRDLABEL *lb;
RRDLABEL_SRC ls;
lfe_start_read(labels, lb, ls)
{
if (lb->index.key == this_key) {
if (lb->index.value)
strncpyz(dst, string2str(lb->index.value), dst_len);
else
dst[0] = '\0';
break;
}
}
lfe_done(labels);
string_freez(this_key);
}
void rrdlabels_get_value_strdup_or_null(RRDLABELS *labels, char **value, const char *key)
{
if(!labels) return;
STRING *this_key = string_strdupz(key);
RRDLABEL *lb;
RRDLABEL_SRC ls;
lfe_start_read(labels, lb, ls)
{
if (lb->index.key == this_key) {
*value = (lb->index.value) ? strdupz(string2str(lb->index.value)) : NULL;
break;
}
}
lfe_done(labels);
string_freez(this_key);
}
void rrdlabels_get_value_to_buffer_or_unset(RRDLABELS *labels, BUFFER *wb, const char *key, const char *unset)
{
if(!labels || !key || !wb) return;
STRING *this_key = string_strdupz(key);
RRDLABEL *lb;
RRDLABEL_SRC ls;
lfe_start_read(labels, lb, ls)
{
if (lb->index.key == this_key) {
if (lb->index.value)
buffer_strcat(wb, string2str(lb->index.value));
else
buffer_strcat(wb, unset);
break;
}
}
lfe_done(labels);
string_freez(this_key);
}
static void rrdlabels_unmark_all_unsafe(RRDLABELS *labels)
{
Pvoid_t *PValue;
Word_t Index = 0;
bool first_then_next = true;
while ((PValue = JudyLFirstThenNext(labels->JudyL, &Index, &first_then_next)))
*((RRDLABEL_SRC *)PValue) &= ~(RRDLABEL_FLAG_OLD | RRDLABEL_FLAG_NEW);
}
void rrdlabels_unmark_all(RRDLABELS *labels)
{
spinlock_lock(&labels->spinlock);
rrdlabels_unmark_all_unsafe(labels);
spinlock_unlock(&labels->spinlock);
}
static void rrdlabels_remove_all_unmarked_unsafe(RRDLABELS *labels)
{
Pvoid_t *PValue;
Word_t Index = 0;
bool first_then_next = true;
while ((PValue = JudyLFirstThenNext(labels->JudyL, &Index, &first_then_next))) {
if (!((*((RRDLABEL_SRC *)PValue)) & (RRDLABEL_FLAG_OLD | RRDLABEL_FLAG_NEW | RRDLABEL_FLAG_PERMANENT))) {
size_t mem_before_judyl = JudyLMemUsed(labels->JudyL);
(void)JudyLDel(&labels->JudyL, Index, PJE0);
size_t mem_after_judyl = JudyLMemUsed(labels->JudyL);
STATS_MINUS_MEMORY(&dictionary_stats_category_rrdlabels, 0, mem_before_judyl - mem_after_judyl, 0);
delete_label((RRDLABEL *)Index);
if (labels->JudyL != (Pvoid_t) NULL) {
Index = 0;
first_then_next = true;
}
}
}
}
void rrdlabels_remove_all_unmarked(RRDLABELS *labels)
{
spinlock_lock(&labels->spinlock);
rrdlabels_remove_all_unmarked_unsafe(labels);
spinlock_unlock(&labels->spinlock);
}
// ----------------------------------------------------------------------------
// rrdlabels_walkthrough_read()
int rrdlabels_walkthrough_read(RRDLABELS *labels, int (*callback)(const char *name, const char *value, RRDLABEL_SRC ls, void *data), void *data)
{
int ret = 0;
if(unlikely(!labels || !callback)) return 0;
RRDLABEL *lb;
RRDLABEL_SRC ls;
lfe_start_read(labels, lb, ls)
{
ret = callback(string2str(lb->index.key), string2str(lb->index.value), ls, data);
if (ret < 0)
break;
}
lfe_done(labels);
return ret;
}
// ----------------------------------------------------------------------------
// rrdlabels_migrate_to_these()
// migrate an existing label list to a new list
void rrdlabels_migrate_to_these(RRDLABELS *dst, RRDLABELS *src) {
if (!dst || !src || (dst == src))
return;
spinlock_lock(&dst->spinlock);
spinlock_lock(&src->spinlock);
rrdlabels_unmark_all_unsafe(dst);
RRDLABEL *label;
Pvoid_t *PValue;