netdata/src/libnetdata/buffer/buffer.c at master · netdata/netdata · GitHub

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// SPDX-License-Identifier: GPL-3.0-or-later

#include "../libnetdata.h"

static ALWAYS_INLINE void buffer_overflow_init(BUFFER *b)

{

b->buffer[b->size] = '\0';

strcpy(&b->buffer[b->size + 1], BUFFER_OVERFLOW_EOF);

}

ALWAYS_INLINE void buffer_reset(BUFFER *wb) {

buffer_flush(wb);

wb->content_type = CT_TEXT_PLAIN;

wb->options = 0;

wb->date = 0;

wb->expires = 0;

buffer_no_cacheable(wb);

buffer_overflow_check(wb);

}

void buffer_char_replace(BUFFER *wb, char from, char to) {

char *s = wb->buffer, *end = &wb->buffer[wb->len];

while(s != end) {

if(*s == from) *s = to;

s++;

}

buffer_overflow_check(wb);

}

ALWAYS_INLINE void buffer_print_sn_flags(BUFFER *wb, SN_FLAGS flags, bool send_anomaly_bit) {

if(unlikely(flags == SN_EMPTY_SLOT)) {

buffer_fast_strcat(wb, "E", 1);

return;

}

size_t printed = 0;

if(likely(send_anomaly_bit && (flags & SN_FLAG_NOT_ANOMALOUS))) {

buffer_fast_strcat(wb, "A", 1);

printed++;

}

if(unlikely(flags & SN_FLAG_RESET)) {

buffer_fast_strcat(wb, "R", 1);

printed++;

}

if(!printed)

buffer_fast_strcat(wb, "''", 2);

}

void buffer_strcat_htmlescape(BUFFER *wb, const char *txt)

{

while(*txt) {

switch(*txt) {

case '&': buffer_strcat(wb, "&"); break;

case '<': buffer_strcat(wb, "<"); break;

case '>': buffer_strcat(wb, ">"); break;

case '"': buffer_strcat(wb, """); break;

case '/': buffer_strcat(wb, "/"); break;

case '\'': buffer_strcat(wb, "'"); break;

default: {

buffer_need_bytes(wb, 1);

wb->buffer[wb->len++] = *txt;

}

txt++;

}

wb->buffer[wb->len] = '\0';

buffer_overflow_check(wb);

}

void buffer_snprintf(BUFFER *wb, size_t len, const char *fmt, ...)

{

if(unlikely(!fmt || !*fmt)) return;

buffer_need_bytes(wb, len + 1);

va_list args;

va_start(args, fmt);

// vsnprintfz() returns the number of bytes actually written - after possible truncation

wb->len += vsnprintfz(&wb->buffer[wb->len], len, fmt, args);

va_end(args);

buffer_overflow_check(wb);

// the buffer is \0 terminated by vsnprintfz

}

void buffer_vsprintf(BUFFER *wb, const char *fmt, va_list args) {

if(unlikely(!fmt || !*fmt)) return;

size_t full_size_bytes = 0, need = 2, space_remaining = 0;

do {

need += full_size_bytes + 2;

buffer_need_bytes(wb, need);

space_remaining = wb->size - wb->len - 1;

// Use the copy of va_list for vsnprintf

va_list args_copy;

va_copy(args_copy, args);

// vsnprintf() returns the number of bytes required, even if bigger than the buffer provided

int ret = vsnprintf(&wb->buffer[wb->len], space_remaining, fmt, args_copy);

va_end(args_copy);

if(unlikely(ret < 0)) {

wb->buffer[wb->len] = '\0';

buffer_overflow_check(wb);

return;

}

full_size_bytes = (size_t)ret;

} while(full_size_bytes >= space_remaining);

wb->len += full_size_bytes;

wb->buffer[wb->len] = '\0';

buffer_overflow_check(wb);

}

void buffer_sprintf(BUFFER *wb, const char *fmt, ...)

{

va_list args;

va_start(args, fmt);

buffer_vsprintf(wb, fmt, args);

va_end(args);

}

void buffer_json_member_add_sprintf(BUFFER *wb, const char *key, const char *fmt, ...)

{

va_list args;

// Create a temporary buffer for the formatted string

BUFFER *tmp = buffer_create(0, NULL);

va_start(args, fmt);

buffer_vsprintf(tmp, fmt, args);

va_end(args);

// Add as JSON member (which will handle escaping)

buffer_json_member_add_string(wb, key, buffer_tostring(tmp));

// Free the temporary buffer

buffer_free(tmp);

}

void buffer_json_add_array_item_sprintf(BUFFER *wb, const char *fmt, ...)

{

va_list args;

// Create a temporary buffer for the formatted string

BUFFER *tmp = buffer_create(0, NULL);

va_start(args, fmt);

buffer_vsprintf(tmp, fmt, args);

va_end(args);

// Add as array item (which will handle escaping)

buffer_json_add_array_item_string(wb, buffer_tostring(tmp));

// Free the temporary buffer

buffer_free(tmp);

}

// generate a javascript date, the fastest possible way...

void buffer_jsdate(BUFFER *wb, int year, int month, int day, int hours, int minutes, int seconds)

{

// 10 20 30 = 35

// 01234567890123456789012345678901234

// Date(2014,04,01,03,28,20)

buffer_need_bytes(wb, 30);

char *b = &wb->buffer[wb->len], *p;

#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__

const uint32_t date = 0x65746144; // "Date" backwards.

#else

const uint32_t date = 0x44617465; // "Date"

#endif

memcpy(b, &date, sizeof(date));

p = b + sizeof(date);

*p++ = '(';

*p++ = '0' + year / 1000; year %= 1000;

*p++ = '0' + year / 100; year %= 100;

*p++ = '0' + year / 10;

*p++ = '0' + year % 10;

*p++ = ',';

*p = '0' + month / 10; if (*p != '0') p++;

*p++ = '0' + month % 10;

*p++ = ',';

*p = '0' + day / 10; if (*p != '0') p++;

*p++ = '0' + day % 10;

*p++ = ',';

*p = '0' + hours / 10; if (*p != '0') p++;

*p++ = '0' + hours % 10;

*p++ = ',';

*p = '0' + minutes / 10; if (*p != '0') p++;

*p++ = '0' + minutes % 10;

*p++ = ',';

*p = '0' + seconds / 10; if (*p != '0') p++;

*p++ = '0' + seconds % 10;

#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__

const uint16_t terminator = 0x0029; // ")\0" backwards.

#else

const uint16_t terminator = 0x2900; // ")\0"

#endif

memcpy(p, &terminator, sizeof(terminator));

p += sizeof(terminator);

wb->len += (size_t)(p - b - 1);

// terminate it

wb->buffer[wb->len] = '\0';

buffer_overflow_check(wb);

}

// generate a date, the fastest possible way...

void buffer_date(BUFFER *wb, int year, int month, int day, int hours, int minutes, int seconds)

{

// 10 20 30 = 35

// 01234567890123456789012345678901234

// 2014-04-01 03:28:20

buffer_need_bytes(wb, 36);

char *b = &wb->buffer[wb->len];

char *p = b;

*p++ = '0' + year / 1000; year %= 1000;

*p++ = '0' + year / 100; year %= 100;

*p++ = '0' + year / 10;

*p++ = '0' + year % 10;

*p++ = '-';

*p++ = '0' + month / 10;

*p++ = '0' + month % 10;

*p++ = '-';

*p++ = '0' + day / 10;

*p++ = '0' + day % 10;

*p++ = ' ';

*p++ = '0' + hours / 10;

*p++ = '0' + hours % 10;

*p++ = ':';

*p++ = '0' + minutes / 10;

*p++ = '0' + minutes % 10;

*p++ = ':';

*p++ = '0' + seconds / 10;

*p++ = '0' + seconds % 10;

*p = '\0';

wb->len += (size_t)(p - b);

// terminate it

wb->buffer[wb->len] = '\0';

buffer_overflow_check(wb);

}

BUFFER *buffer_create(size_t size, size_t *statistics)

{

BUFFER *b;

if(!size)

size = 1024 - sizeof(BUFFER_OVERFLOW_EOF) - 2;

else

size++; // make room for the terminator

netdata_log_debug(D_WEB_BUFFER, "Creating new web buffer of size %zu.", size);

b = callocz(1, sizeof(BUFFER));

b->buffer = mallocz(size + sizeof(BUFFER_OVERFLOW_EOF) + 2);

b->buffer[0] = '\0';

b->size = size;

b->content_type = CT_TEXT_PLAIN;

b->statistics = statistics;

buffer_no_cacheable(b);

buffer_overflow_init(b);

buffer_overflow_check(b);

if(b->statistics)

__atomic_add_fetch(b->statistics, b->size + sizeof(BUFFER) + sizeof(BUFFER_OVERFLOW_EOF) + 2, __ATOMIC_RELAXED);

return(b);

}

void buffer_free(BUFFER *b) {

if(unlikely(!b)) return;

buffer_overflow_check(b);

netdata_log_debug(D_WEB_BUFFER, "Freeing web buffer of size %zu.", (size_t)b->size);

if(b->statistics)

__atomic_sub_fetch(b->statistics, b->size + sizeof(BUFFER) + sizeof(BUFFER_OVERFLOW_EOF) + 2, __ATOMIC_RELAXED);

freez(b->buffer);

freez(b);

}

void buffer_increase(BUFFER *b, size_t free_size_required) {

buffer_overflow_check(b);

size_t remaining = b->size - b->len;

if(remaining >= free_size_required) return;

size_t increase = free_size_required - remaining;

size_t minimum = 1024;

if(minimum > increase) increase = minimum;

size_t optimal = (b->size > 5 * 1024 * 1024) ? b->size / 2 : b->size;

if(optimal > increase) increase = optimal;

netdata_log_debug(D_WEB_BUFFER, "Increasing data buffer from size %zu to %zu.", (size_t)b->size, (size_t)(b->size + increase));

b->buffer = reallocz(b->buffer, b->size + increase + sizeof(BUFFER_OVERFLOW_EOF) + 2);

b->size += increase;

if(b->statistics)

__atomic_add_fetch(b->statistics, increase, __ATOMIC_RELAXED);

buffer_overflow_init(b);

buffer_overflow_check(b);

}

// ----------------------------------------------------------------------------

void buffer_json_initialize(BUFFER *wb, const char *key_quote, const char *value_quote, int depth,

bool add_anonymous_object, BUFFER_JSON_OPTIONS options) {

strncpyz(wb->json.key_quote, key_quote, BUFFER_QUOTE_MAX_SIZE);

strncpyz(wb->json.value_quote, value_quote, BUFFER_QUOTE_MAX_SIZE);

wb->json.depth = (int8_t)(depth - 1);

_buffer_json_depth_push(wb, BUFFER_JSON_OBJECT);

if(add_anonymous_object)

buffer_fast_strcat(wb, "{", 1);

else

options |= BUFFER_JSON_OPTIONS_NON_ANONYMOUS;

wb->json.options = options;

wb->content_type = CT_APPLICATION_JSON;

buffer_no_cacheable(wb);

}

void buffer_json_finalize(BUFFER *wb) {

while(wb->json.depth >= 0) {

switch(wb->json.stack[wb->json.depth].type) {

case BUFFER_JSON_OBJECT:

if (wb->json.depth == 0)

if (!(wb->json.options & BUFFER_JSON_OPTIONS_NON_ANONYMOUS))

buffer_json_object_close(wb);

else

_buffer_json_depth_pop(wb);

else

buffer_json_object_close(wb);

break;

case BUFFER_JSON_ARRAY:

buffer_json_array_close(wb);

break;

default:

internal_fatal(true, "BUFFER: unknown json member type in stack");

break;

}

if(!(wb->json.options & BUFFER_JSON_OPTIONS_MINIFY))

buffer_fast_strcat(wb, "\n", 1);

}

// ----------------------------------------------------------------------------

__attribute__((nonstring))

const char hex_digits[16] = "0123456789ABCDEF";

__attribute__((nonstring))

const char hex_digits_lower[16] = "0123456789abcdef";

__attribute__((nonstring))

const char base64_digits[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

unsigned char hex_value_from_ascii[256];

unsigned char base64_value_from_ascii[256];

__attribute__((constructor)) void initialize_ascii_maps(void) {

for(size_t i = 0 ; i < 256 ; i++) {

hex_value_from_ascii[i] = 255;

base64_value_from_ascii[i] = 255;

}

for(size_t i = 0; i < 16 ; i++) {

hex_value_from_ascii[(int)toupper(hex_digits[i])] = i;

hex_value_from_ascii[(int)tolower(hex_digits[i])] = i;

}

for(size_t i = 0; i < 64 ; i++)

base64_value_from_ascii[(int)base64_digits[i]] = i;

}

// ----------------------------------------------------------------------------

void buffer_json_member_add_datetime_rfc3339(BUFFER *wb, const char *key, uint64_t datetime_ut, bool utc) {

char buf[RFC3339_MAX_LENGTH];

rfc3339_datetime_ut(buf, sizeof(buf), datetime_ut, 2, utc);

buffer_json_member_add_string(wb, key, buf);

}

void buffer_json_member_add_duration_ut(BUFFER *wb, const char *key, int64_t duration_ut) {

char buf[64];

duration_snprintf(buf, sizeof(buf), duration_ut, "us", true);

buffer_json_member_add_string(wb, key, buf);

}

void buffer_json_add_array_item_datetime_rfc3339(BUFFER *wb, uint64_t datetime_ut, bool utc) {

char buf[RFC3339_MAX_LENGTH];

rfc3339_datetime_ut(buf, sizeof(buf), datetime_ut, 2, utc);

buffer_json_add_array_item_string(wb, buf);

}

// ----------------------------------------------------------------------------

// unit test

static int buffer_expect(BUFFER *wb, const char *expected) {

const char *generated = buffer_tostring(wb);

if(strcmp(generated, expected) != 0) {

netdata_log_error("BUFFER: mismatch.\nGenerated:\n%s\nExpected:\n%s\n",

generated, expected);

return 1;

}

return 0;

}

static int buffer_uint64_roundtrip(BUFFER *wb, NUMBER_ENCODING encoding, uint64_t value, const char *expected) {

int errors = 0;

buffer_flush(wb);

buffer_print_uint64_encoded(wb, encoding, value);

if(expected)

errors += buffer_expect(wb, expected);

uint64_t v = str2ull_encoded(buffer_tostring(wb));

if(v != value) {

netdata_log_error("BUFFER: string '%s' does resolves to %llu, expected %llu",

buffer_tostring(wb), (unsigned long long)v, (unsigned long long)value);

errors++;

}

buffer_flush(wb);

return errors;

}

static int buffer_int64_roundtrip(BUFFER *wb, NUMBER_ENCODING encoding, int64_t value, const char *expected) {

int errors = 0;

buffer_flush(wb);

buffer_print_int64_encoded(wb, encoding, value);

if(expected)

errors += buffer_expect(wb, expected);

int64_t v = str2ll_encoded(buffer_tostring(wb));

if(v != value) {

netdata_log_error("BUFFER: string '%s' does resolves to %lld, expected %lld",

buffer_tostring(wb), (long long)v, (long long)value);

errors++;

}

buffer_flush(wb);

return errors;

}

static int buffer_int64_parse(const char *encoded, int64_t expected) {

int64_t value = str2ll_encoded(encoded);

if(value == expected)

return 0;

netdata_log_error("BUFFER: string '%s' resolves to %lld, expected %lld",

encoded, (long long)value, (long long)expected);

return 1;

}

static int buffer_double_roundtrip(BUFFER *wb, NUMBER_ENCODING encoding, NETDATA_DOUBLE value, const char *expected) {

int errors = 0;

buffer_flush(wb);

buffer_print_netdata_double_encoded(wb, encoding, value);

if(expected)

errors += buffer_expect(wb, expected);

NETDATA_DOUBLE v = str2ndd_encoded(buffer_tostring(wb), NULL);

if(v != value) {

netdata_log_error("BUFFER: string '%s' does resolves to %.12f, expected %.12f",

buffer_tostring(wb), v, value);

errors++;

}

buffer_flush(wb);

return errors;

}

int buffer_unittest(void) {

int errors = 0;

BUFFER *wb = buffer_create(0, NULL);

buffer_uint64_roundtrip(wb, NUMBER_ENCODING_DECIMAL, 0, "0");

buffer_uint64_roundtrip(wb, NUMBER_ENCODING_HEX, 0, "0x0");

buffer_uint64_roundtrip(wb, NUMBER_ENCODING_BASE64, 0, "#A");

buffer_uint64_roundtrip(wb, NUMBER_ENCODING_DECIMAL, 1676071986, "1676071986");

buffer_uint64_roundtrip(wb, NUMBER_ENCODING_HEX, 1676071986, "0x63E6D432");

buffer_uint64_roundtrip(wb, NUMBER_ENCODING_BASE64, 1676071986, "#Bj5tQy");

buffer_uint64_roundtrip(wb, NUMBER_ENCODING_DECIMAL, 18446744073709551615ULL, "18446744073709551615");

buffer_uint64_roundtrip(wb, NUMBER_ENCODING_HEX, 18446744073709551615ULL, "0xFFFFFFFFFFFFFFFF");

buffer_uint64_roundtrip(wb, NUMBER_ENCODING_BASE64, 18446744073709551615ULL, "#P//////////");

buffer_int64_roundtrip(wb, NUMBER_ENCODING_DECIMAL, 0, "0");

buffer_int64_roundtrip(wb, NUMBER_ENCODING_HEX, 0, "0x0");

buffer_int64_roundtrip(wb, NUMBER_ENCODING_BASE64, 0, "#A");

buffer_int64_roundtrip(wb, NUMBER_ENCODING_DECIMAL, -1676071986, "-1676071986");

buffer_int64_roundtrip(wb, NUMBER_ENCODING_HEX, -1676071986, "-0x63E6D432");

buffer_int64_roundtrip(wb, NUMBER_ENCODING_BASE64, -1676071986, "-#Bj5tQy");

buffer_int64_roundtrip(wb, NUMBER_ENCODING_DECIMAL, (int64_t)-9223372036854775807ULL, "-9223372036854775807");

buffer_int64_roundtrip(wb, NUMBER_ENCODING_HEX, (int64_t)-9223372036854775807ULL, "-0x7FFFFFFFFFFFFFFF");

buffer_int64_roundtrip(wb, NUMBER_ENCODING_BASE64, (int64_t)-9223372036854775807ULL, "-#H//////////");

errors += buffer_int64_roundtrip(wb, NUMBER_ENCODING_DECIMAL, INT64_MIN, "-9223372036854775808");

errors += buffer_int64_roundtrip(wb, NUMBER_ENCODING_HEX, INT64_MIN, "-0x8000000000000000");

errors += buffer_int64_roundtrip(wb, NUMBER_ENCODING_BASE64, INT64_MIN, "-#IAAAAAAAAAA");

static const struct {

const char *encoded;

int64_t expected;

} int64_parse_tests[] = {

{ "0", 0 },

{ "-0", 0 },

{ "9223372036854775807", LLONG_MAX },

{ "0x7FFFFFFFFFFFFFFF", LLONG_MAX },

{ "#H//////////", LLONG_MAX },

{ "-9223372036854775808", LLONG_MIN },

{ "-0x8000000000000000", LLONG_MIN },

{ "-#IAAAAAAAAAA", LLONG_MIN },

{ "9223372036854775808", LLONG_MIN },

{ "0x8000000000000000", LLONG_MIN },

{ "#IAAAAAAAAAA", LLONG_MIN },

{ "-9223372036854775809", LLONG_MAX },

{ "-0x8000000000000001", LLONG_MAX },

{ "-#IAAAAAAAAAB", LLONG_MAX },

{ "18446744073709551615", -1 },

{ "-18446744073709551615", 1 },

{ "18446744073709551616", 0 },

{ "0x10000000000000000", 0 },

{ "#QAAAAAAAAAA", 0 },

{ " 9223372036854775808", LLONG_MIN },

{ " -9223372036854775808", 0 },

{ "- 9223372036854775808", LLONG_MIN },

{ " 0x8000000000000000", 0 },

{ "- 0x8000000000000000", 0 },

{ "-9223372036854775808suffix", LLONG_MIN },

{ "-0x8000000000000000!suffix", LLONG_MIN },

{ "-#IAAAAAAAAAA!suffix", LLONG_MIN },

{ "", 0 },

{ "-", 0 },

{ "+1", 0 },

{ "--1", 0 },

{ "#", 0 },

{ "0x", 0 },

{ "-#", 0 },

{ "-0x", 0 },

};

for(size_t i = 0; i < _countof(int64_parse_tests); i++)

errors += buffer_int64_parse(int64_parse_tests[i].encoded, int64_parse_tests[i].expected);

buffer_double_roundtrip(wb, NUMBER_ENCODING_DECIMAL, 0, "0");

buffer_double_roundtrip(wb, NUMBER_ENCODING_HEX, 0, "%0");

buffer_double_roundtrip(wb, NUMBER_ENCODING_BASE64, 0, "@A");

buffer_double_roundtrip(wb, NUMBER_ENCODING_DECIMAL, 1.5, "1.5");

buffer_double_roundtrip(wb, NUMBER_ENCODING_HEX, 1.5, "%3FF8000000000000");

buffer_double_roundtrip(wb, NUMBER_ENCODING_BASE64, 1.5, "@D/4AAAAAAAA");

buffer_double_roundtrip(wb, NUMBER_ENCODING_DECIMAL, 1.23e+14, "123000000000000");

buffer_double_roundtrip(wb, NUMBER_ENCODING_HEX, 1.23e+14, "%42DBF78AD3AC0000");

buffer_double_roundtrip(wb, NUMBER_ENCODING_BASE64, 1.23e+14, "@ELb94rTrAAA");

buffer_double_roundtrip(wb, NUMBER_ENCODING_DECIMAL, 9.12345678901234567890123456789e+45, "9.123456789012346128e+45");

buffer_double_roundtrip(wb, NUMBER_ENCODING_HEX, 9.12345678901234567890123456789e+45, "%497991C25C9E4309");

buffer_double_roundtrip(wb, NUMBER_ENCODING_BASE64, 9.12345678901234567890123456789e+45, "@El5kcJcnkMJ");

buffer_flush(wb);

{

char tmp[32];

const wchar_t invalid_wide[] = { (wchar_t)0xd800, 0 };

if(snprintf(tmp, sizeof(tmp), "%ls", invalid_wide) < 0) {

buffer_strcat(wb, "prefix");

buffer_sprintf(wb, "%ls", invalid_wide);

errors += buffer_expect(wb, "prefix");

}

buffer_flush(wb);

{

char buf[1024 + 1];

for(size_t i = 0; i < 1024 ;i++)

buf[i] = (char)(i % 26) + 'A';

buf[1024] = '\0';

buffer_strcat(wb, buf);

errors += buffer_expect(wb, buf);

}

buffer_flush(wb);

buffer_json_initialize(wb, "\"", "\"", 0, true, BUFFER_JSON_OPTIONS_DEFAULT);

buffer_json_finalize(wb);

errors += buffer_expect(wb, "{\n}\n");

buffer_flush(wb);

buffer_json_initialize(wb, "\"", "\"", 0, true, BUFFER_JSON_OPTIONS_DEFAULT);

buffer_json_member_add_string(wb, "hello", "world");

buffer_json_member_add_string(wb, "alpha", "this: \" is a double quote");

buffer_json_member_add_object(wb, "object1");

buffer_json_member_add_string(wb, "hello", "world");

buffer_json_finalize(wb);

errors += buffer_expect(wb, "{\n \"hello\":\"world\",\n \"alpha\":\"this: \\\" is a double quote\",\n \"object1\":{\n \"hello\":\"world\"\n }\n}\n");

buffer_free(wb);

return errors;

}

netdata/src/libnetdata/buffer/buffer.c at master · netdata/netdata · GitHub

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