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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(rrdb.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->respon
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