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/*
* Copyright (C) 2018 "IoT.bzh"
* Author "Romain Forlot" <romain.forlot@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "influxdb.h"
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <systemd/sd-event.h>
#include "../utils/list.h"
void fill_tag_n_fields(void *c, json_object *columnJ)
{
int length = json_object_get_string_len(columnJ);
const char *column = json_object_get_string(columnJ);
struct series_columns_t *s_col = (struct series_columns_t *)c;
if(strncasecmp(&column[length-1], "_t", 2) == 0) {
add_key(s_col->tags, column);
}
else if(strncasecmp(&column[length-1], "_f", 2) == 0) {
add_key(s_col->fields, column);
}
return;
}
void unpack_metric_from_db(void *series_processed, json_object *metricJ)
{
const char *name;
int length = 0;
struct series_columns_t col = {.tags = NULL, .fields = NULL};
json_object *columnsJ = NULL, *valuesJ = NULL;
if(wrap_json_unpack(metricJ, "{ss, so, so!}",
"name", &name,
"columns", &columnsJ,
"values", &valuesJ)) {
AFB_ERROR("Unpacking metric goes wrong");
return;
}
length = json_object_get_string_len(columnsJ);
wrap_json_array_for_all(columnsJ, fill_tag_n_fields, &col);
/* Increment counter of series well processed */
++*((int*)series_processed);
}
int unpack_series(json_object *seriesJ)
{
size_t series_processed = 0;
wrap_json_array_for_all(seriesJ, unpack_metric_from_db, (void*)&series_processed);
return 0;
}
void forward_to_garner(const char *result, size_t size)
{
int id = 0;
json_object *resultsJ = NULL,
*seriesJ = NULL,
*db_dumpJ = json_tokener_parse(result);
if( wrap_json_unpack(db_dumpJ, "{so!}",
"results", &resultsJ) ||
wrap_json_unpack(resultsJ, "[{si,so!}]",
"statement_id", &id,
"series", &seriesJ)) {
AFB_ERROR("Unpacking results from influxdb request. Request results was:\n%s", result);
return;
}
if(seriesJ)
unpack_series(seriesJ);
}
void influxdb_read_curl_cb(void *closure, int status, CURL *curl, const char *result, size_t size)
{
long rep_code = curl_wrap_response_code_get(curl);
switch(rep_code) {
case 200:
AFB_DEBUG("Read correctly done");
forward_to_garner(result, size);
break;
case 400:
AFB_ERROR("Unacceptable request. %s", result);
break;
case 401:
AFB_ERROR("Invalid authentication. %s", result);
break;
default:
AFB_ERROR("Unexptected behavior. %s", result);
break;
}
}
CURL *make_curl_query_get(const char *url)
{
CURL *curl;
char *args[5];
char query[255] = {};
char last_ts[30] = {};
char *now;
int length_now;
args[0] = "epoch";
args[1] = "ns";
args[2] = "q";
strncat(query, "SELECT * FROM /^.*$/", strlen("SELECT * FROM /^.*$/"));
args[4] = NULL;
length_now = asprintf(&now, "%lu", get_ts());
int rootdir_fd = afb_daemon_rootdir_get_fd();
int fd_last_read = openat(rootdir_fd, "last_db_read", O_CREAT | O_RDWR, S_IRWXU);
if (fd_last_read < 0)
return NULL;
/* Reading last timestamp recorded and get metric from that point until now
else write the last timestamp */
if(read(fd_last_read, last_ts, sizeof(last_ts)) == 0) {
if(write(fd_last_read, now, length_now) != length_now)
AFB_ERROR("Error writing last_db_read file: %s\n", strerror( errno ));
}
else {
strncat(query, " WHERE time >= ", strlen(" WHERE time >= "));
strncat(query, last_ts, strlen(last_ts));
close(fd_last_read);
fd_last_read = openat(rootdir_fd, "last_db_read", O_TRUNC | O_RDWR);
if (write(fd_last_read, now, length_now) != length_now)
AFB_ERROR("Error writing last_db_read file: %s", strerror( errno ));
}
args[3] = query;
curl = curl_wrap_prepare_get(url, NULL, (const char * const*)args);
return curl;
}
int influxdb_read(sd_event_source *s, uint64_t usec, void *userdata)
{
CURL *curl;
struct reader_args *a = NULL;
if(userdata)
a = (struct reader_args*)userdata;
else
return ERROR;
char url[URL_MAXIMUM_LENGTH]; /* Safe limit for most popular web browser */
make_url(url, sizeof(url), a->host, a->port, "query");
curl = make_curl_query_get(url);
curl_wrap_do(curl, influxdb_read_curl_cb, NULL);
/* Reschedule next run */
sd_event_source_set_time(s, usec + a->delay);
return 0;
}
int influxdb_reader(void *args)
{
int err = 0;
uint64_t usec;
struct sd_event_source *evtSource = NULL;
/* Set a cyclic cb call each 1s to call the read callback */
sd_event_now(afb_daemon_get_event_loop(), CLOCK_MONOTONIC, &usec);
err = sd_event_add_time(afb_daemon_get_event_loop(), &evtSource, CLOCK_MONOTONIC, usec+1000000, 250, influxdb_read, args);
if(!err)
err = sd_event_source_set_enabled(evtSource, SD_EVENT_ON);
return err;
}
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