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// SPDX-License-Identifier: GPL-3.0-or-later
#include "aclk_query.h"
#include "aclk_stats.h"
#include "aclk_tx_msgs.h"
#include "../../web/server/web_client_cache.h"
#define WEB_HDR_ACCEPT_ENC "Accept-Encoding:"
#define ACLK_MAX_WEB_RESPONSE_SIZE (30 * 1024 * 1024)
pthread_cond_t query_cond_wait = PTHREAD_COND_INITIALIZER;
pthread_mutex_t query_lock_wait = PTHREAD_MUTEX_INITIALIZER;
#define QUERY_THREAD_LOCK pthread_mutex_lock(&query_lock_wait)
#define QUERY_THREAD_UNLOCK pthread_mutex_unlock(&query_lock_wait)
struct pending_req_list {
const char *msg_id;
uint32_t hash;
int canceled;
struct pending_req_list *next;
};
static struct pending_req_list *pending_req_list_head = NULL;
static pthread_mutex_t pending_req_list_lock = PTHREAD_MUTEX_INITIALIZER;
static struct pending_req_list *pending_req_list_add(const char *msg_id)
{
struct pending_req_list *new = callocz(1, sizeof(struct pending_req_list));
new->msg_id = msg_id;
new->hash = simple_hash(msg_id);
pthread_mutex_lock(&pending_req_list_lock);
new->next = pending_req_list_head;
pending_req_list_head = new;
pthread_mutex_unlock(&pending_req_list_lock);
return new;
}
void pending_req_list_rm(const char *msg_id)
{
uint32_t hash = simple_hash(msg_id);
struct pending_req_list *prev = NULL;
pthread_mutex_lock(&pending_req_list_lock);
struct pending_req_list *curr = pending_req_list_head;
while (curr) {
if (curr->hash == hash && strcmp(curr->msg_id, msg_id) == 0) {
if (prev)
prev->next = curr->next;
else
pending_req_list_head = curr->next;
freez(curr);
break;
}
prev = curr;
curr = curr->next;
}
pthread_mutex_unlock(&pending_req_list_lock);
}
int mark_pending_req_cancelled(const char *msg_id)
{
uint32_t hash = simple_hash(msg_id);
pthread_mutex_lock(&pending_req_list_lock);
struct pending_req_list *curr = pending_req_list_head;
while (curr) {
if (curr->hash == hash && strcmp(curr->msg_id, msg_id) == 0) {
curr->canceled = 1;
pthread_mutex_unlock(&pending_req_list_lock);
return 0;
}
curr = curr->next;
}
pthread_mutex_unlock(&pending_req_list_lock);
return 1;
}
static bool aclk_web_client_interrupt_cb(struct web_client *w __maybe_unused, void *data)
{
struct pending_req_list *req = (struct pending_req_list *)data;
return req->canceled;
}
static int http_api_v2(struct aclk_query_thread *query_thr, aclk_query_t query) {
int retval = 0;
BUFFER *local_buffer = NULL;
size_t size = 0;
size_t sent = 0;
int z_ret;
BUFFER *z_buffer = buffer_create(NETDATA_WEB_RESPONSE_INITIAL_SIZE, &netdata_buffers_statistics.buffers_aclk);
char *start, *end;
struct web_client *w = web_client_get_from_cache();
w->acl = WEB_CLIENT_ACL_ACLK;
w->mode = WEB_CLIENT_MODE_GET;
w->timings.tv_in = query->created_tv;
w->interrupt.callback = aclk_web_client_interrupt_cb;
w->interrupt.callback_data = pending_req_list_add(query->msg_id);
usec_t t;
web_client_timeout_checkpoint_set(w, query->timeout);
if(web_client_timeout_checkpoint_and_check(w, &t)) {
netdata_log_access("QUERY CANCELED: QUEUE TIME EXCEEDED %llu ms (LIMIT %d ms)", t / USEC_PER_MS, query->timeout);
retval = 1;
w->response.code = HTTP_RESP_BACKEND_FETCH_FAILED;
aclk_http_msg_v2_err(query_thr->client, query->callback_topic, query->msg_id, w->response.code, CLOUD_EC_SND_TIMEOUT, CLOUD_EMSG_SND_TIMEOUT, NULL, 0);
goto cleanup;
}
web_client_decode_path_and_query_string(w, query->data.http_api_v2.query);
char *path = (char *)buffer_tostring(w->url_path_decoded);
if (aclk_stats_enabled) {
char *url_path_endpoint = strrchr(path, '/');
ACLK_STATS_LOCK;
int stat_idx = aclk_cloud_req_http_type_to_idx(url_path_endpoint ? url_path_endpoint + 1 : "other");
aclk_metrics_per_sample.cloud_req_http_by_type[stat_idx]++;
ACLK_STATS_UNLOCK;
}
w->response.code = (short)web_client_api_request_with_node_selection(localhost, w, path);
web_client_timeout_checkpoint_response_ready(w, &t);
if(buffer_strlen(w->response.data) > ACLK_MAX_WEB_RESPONSE_SIZE) {
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "response is too big");
w->response.data->content_type = CT_TEXT_PLAIN;
w->response.code = HTTP_RESP_CONTENT_TOO_LONG;
}
if (aclk_stats_enabled) {
ACLK_STATS_LOCK;
aclk_metrics_per_sample.cloud_q_process_total += t;
aclk_metrics_per_sample.cloud_q_process_count++;
if (aclk_metrics_per_sample.cloud_q_process_max < t)
aclk_metrics_per_sample.cloud_q_process_max = t;
ACLK_STATS_UNLOCK;
}
size = w->response.data->len;
sent = size;
// check if gzip encoding can and should be used
if ((start = strstr((char *)query->data.http_api_v2.payload, WEB_HDR_ACCEPT_ENC))) {
start += strlen(WEB_HDR_ACCEPT_ENC);
end = strstr(start, "\x0D\x0A");
start = strstr(start, "gzip");
if (start && start < end) {
w->response.zstream.zalloc = Z_NULL;
w->response.zstream.zfree = Z_NULL;
w->response.zstream.opaque = Z_NULL;
if(deflateInit2(&w->response.zstream, web_gzip_level, Z_DEFLATED, 15 + 16, 8, web_gzip_strategy) == Z_OK) {
w->response.zinitialized = true;
w->response.zoutput = true;
} else
netdata_log_error("Failed to initialize zlib. Proceeding without compression.");
}
}
if (w->response.data->len && w->response.zinitialized) {
w->response.zstream.next_in = (Bytef *)w->response.data->buffer;
w->response.zstream.avail_in = w->response.data->len;
do {
w->response.zstream.avail_out = NETDATA_WEB_RESPONSE_ZLIB_CHUNK_SIZE;
w->response.zstream.next_out = w->response.zbuffer;
z_ret = deflate(&w->response.zstream, Z_FINISH);
if(z_ret < 0) {
if(w->response.zstream.msg)
netdata_log_error("Error compressing body. ZLIB error: \"%s\"", w->response.zstream.msg);
else
netdata_log_error("Unknown error during zlib compression.");
retval = 1;
w->response.code = 500;
aclk_http_msg_v2_err(query_thr->client, query->callback_topic, query->msg_id, w->response.code, CLOUD_EC_ZLIB_ERROR, CLOUD_EMSG_ZLIB_ERROR, NULL, 0);
goto cleanup;
}
int bytes_to_cpy = NETDATA_WEB_RESPONSE_ZLIB_CHUNK_SIZE - w->response.zstream.avail_out;
buffer_need_bytes(z_buffer, bytes_to_cpy);
memcpy(&z_buffer->buffer[z_buffer->len], w->response.zbuffer, bytes_to_cpy);
z_buffer->len += bytes_to_cpy;
} while(z_ret != Z_STREAM_END);
// so that web_client_build_http_header
// puts correct content length into header
buffer_free(w->response.data);
w->response.data = z_buffer;
z_buffer = NULL;
}
web_client_build_http_header(w);
local_buffer = buffer_create(NETDATA_WEB_RESPONSE_INITIAL_SIZE, &netdata_buffers_statistics.buffers_aclk);
local_buffer->content_type = CT_APPLICATION_JSON;
buffer_strcat(local_buffer, w->response.header_output->buffer);
if (w->response.data->len) {
if (w->response.zinitialized) {
buffer_need_bytes(local_buffer, w->response.data->len);
memcpy(&local_buffer->buffer[local_buffer->len], w->response.data->buffer, w->response.data->len);
local_buffer->len += w->response.data->len;
sent = sent - size + w->response.data->len;
} else {
buffer_strcat(local_buffer, w->response.data->buffer);
}
}
// send msg.
w->response.code = aclk_http_msg_v2(query_thr->client, query->callback_topic, query->msg_id, t, query->created, w->response.code, local_buffer->buffer, local_buffer->len);
struct timeval tv;
cleanup:
now_monotonic_high_precision_timeval(&tv);
netdata_log_access("%llu: %d '[ACLK]:%d' '%s' (sent/all = %zu/%zu bytes %0.0f%%, prep/sent/total = %0.2f/%0.2f/%0.2f ms) %d '%s'",
w->id
, gettid()
, query_thr->idx
, "DATA"
, sent
, size
, size > sent ? -(((size - sent) / (double)size) * 100.0) : ((size > 0) ? (((sent - size ) / (double)size) * 100.0) : 0.0)
, dt_usec(&w->timings.tv_ready, &w->timings.tv_in) / 1000.0
, dt_usec(&tv, &w->timings.tv_ready) / 1000.0
, dt_usec(&tv, &w->timings.tv_in) / 1000.0
, w->response.code
, strip_control_characters((char *)buffer_tostring(w->url_as_received))
);
web_client_release_to_cache(w);
pending_req_list_rm(query->msg_id);
buffer_free(z_buffer);
buffer_free(local_buffer);
return retval;
}
static int send_bin_msg(struct aclk_query_thread *query_thr, aclk_query_t query)
{
// this will be simplified when legacy support is removed
aclk_send_bin_message_subtopic_pid(query_thr->client, query->data.bin_payload.payload, query->data.bin_payload.size, query->data.bin_payload.topic, query->data.bin_payload.msg_name);
return 0;
}
const char *aclk_query_get_name(aclk_query_type_t qt, int unknown_ok)
{
switch (qt) {
case HTTP_API_V2: return "http_api_request_v2";
case REGISTER_NODE: return "register_node";
case NODE_STATE_UPDATE: return "node_state_update";
case CHART_DIMS_UPDATE: return "chart_and_dim_update";
case CHART_CONFIG_UPDATED: return "chart_config_updated";
case CHART_RESET: return "reset_chart_messages";
case RETENTION_UPDATED: return "update_retention_info";
case UPDATE_NODE_INFO: return "update_node_info";
case ALARM_PROVIDE_CHECKPOINT: return "alarm_checkpoint";
case ALARM_PROVIDE_CFG: return "provide_alarm_config";
case ALARM_SNAPSHOT: return "alarm_snapshot";
case UPDATE_NODE_COLLECTORS: return "update_node_collectors";
case PROTO_BIN_MESSAGE: return "generic_binary_proto_message";
default:
if (!unknown_ok)
error_report("Unknown query type used %d", (int) qt);
return "unknown";
}
}
static void aclk_query_process_msg(struct aclk_query_thread *query_thr, aclk_query_t query)
{
if (query->type == UNKNOWN || query->type >= ACLK_QUERY_TYPE_COUNT) {
error_report("Unknown query in query queue. %u", query->type);
aclk_query_free(query);
return;
}
worker_is_busy(query->type);
if (query->type == HTTP_API_V2) {
netdata_log_debug(D_ACLK, "Processing Queued Message of type: \"http_api_request_v2\"");
http_api_v2(query_thr, query);
} else {
netdata_log_debug(D_ACLK, "Processing Queued Message of type: \"%s\"", query->data.bin_payload.msg_name);
send_bin_msg(query_thr, query);
}
if (aclk_stats_enabled) {
ACLK_STATS_LOCK;
aclk_metrics_per_sample.queries_dispatched++;
aclk_queries_per_thread[query_thr->idx]++;
aclk_metrics_per_sample.queries_per_type[query->type]++;
ACLK_STATS_UNLOCK;
}
aclk_query_free(query);
worker_is_idle();
}
/* Processes messages from queue. Compete for work with other threads
*/
int aclk_query_process_msgs(struct aclk_query_thread *query_thr)
{
aclk_query_t query;
while ((query = aclk_queue_pop()))
aclk_query_process_msg(query_thr, query);
return 0;
}
static void worker_aclk_register(void) {
worker_register("ACLKQUERY");
for (int i = 1; i < ACLK_QUERY_TYPE_COUNT; i++) {
worker_register_job_name(i, aclk_query_get_name(i, 0));
}
}
static void aclk_query_request_cancel(void *data)
{
pthread_cond_broadcast((pthread_cond_t *) data);
}
/**
* Main query processing thread
*/
void *aclk_query_main_thread(void *ptr)
{
worker_aclk_register();
struct aclk_query_thread *query_thr = ptr;
service_register(SERVICE_THREAD_TYPE_NETDATA, aclk_query_request_cancel, NULL, &query_cond_wait, false);
while (service_running(SERVICE_ACLK | ABILITY_DATA_QUERIES)) {
aclk_query_process_msgs(query_thr);
worker_is_idle();
QUERY_THREAD_LOCK;
if (unlikely(pthread_cond_wait(&query_cond_wait, &query_lock_wait)))
sleep_usec(USEC_PER_SEC * 1);
QUERY_THREAD_UNLOCK;
}
worker_unregister();
return NULL;
}
#define TASK_LEN_MAX 22
void aclk_query_threads_start(struct aclk_query_threads *query_threads, mqtt_wss_client client)
{
netdata_log_info("Starting %d query threads.", query_threads->count);
char thread_name[TASK_LEN_MAX];
query_threads->thread_list = callocz(query_threads->count, sizeof(struct aclk_query_thread));
for (int i = 0; i < query_threads->count; i++) {
query_threads->thread_list[i].idx = i; //thread needs to know its index for statistics
query_threads->thread_list[i].client = client;
if(unlikely(snprintfz(thread_name, TASK_LEN_MAX, "ACLK_QRY[%d]", i) < 0))
netdata_log_error("snprintf encoding error");
netdata_thread_create(
&query_threads->thread_list[i].thread, thread_name, NETDATA_THREAD_OPTION_JOINABLE, aclk_query_main_thread,
&query_threads->thread_list[i]);
}
}
void aclk_query_threads_cleanup(struct aclk_query_threads *query_threads)
{
if (query_threads && query_threads->thread_list) {
for (int i = 0; i < query_threads->count; i++) {
netdata_thread_join(query_threads->thread_list[i].thread, NULL);
}
freez(query_threads->thread_list);
}
aclk_queue_lock();
aclk_queue_flush();
}
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