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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"
struct metrics_list {
struct series_t serie;
json_object *metricsJ;
AFB_ApiT api;
};
static void fill_n_send_values(void *c, json_object *valuesJ)
{
struct list *it = NULL;
int length = json_object_get_string_len(valuesJ), i = 0, j = 0;
struct metrics_list *m_list = (struct metrics_list *)c;
json_object *one_metric = json_object_new_object();
for (i = 0; i < length; i++) {
if(!i)
m_list->serie.timestamp = json_object_get_int64(valuesJ);
else {
if(set_value(m_list->serie.serie_columns.tags, valuesJ, i)) {
if(set_value(m_list->serie.serie_columns.fields, valuesJ, j)) {
AFB_ApiError(m_list->api, "No tags nor fields fits.");
}
j++;
}
}
}
/* Build a metric object to add in the JSON array */
json_object_object_add(one_metric, "name", json_object_new_string(m_list->serie.name));
json_object_object_add(one_metric, "timestamp", json_object_new_int64(m_list->serie.timestamp));
for(it = m_list->serie.serie_columns.tags; it != NULL; it = it->next)
json_object_object_add(one_metric, m_list->serie.serie_columns.tags->key, m_list->serie.serie_columns.tags->value);
for(it = m_list->serie.serie_columns.fields; it != NULL; it = it->next)
json_object_object_add(one_metric, m_list->serie.serie_columns.fields->key, m_list->serie.serie_columns.fields->value);
json_object_array_add(m_list->metricsJ, one_metric);
}
static void fill_key(void *c, json_object *columnJ)
{
int length = json_object_get_string_len(columnJ);
const char *column = json_object_get_string(columnJ);
struct metrics_list *m_list = (struct metrics_list *)c;
if(strncasecmp(&column[length-2], "_t", 2) == 0) {
add_key(&m_list->serie.serie_columns.tags, column);
}
else if(strncasecmp(&column[length-2], "_f", 2) == 0) {
add_key(&m_list->serie.serie_columns.fields, column);
}
}
static void unpack_metric_from_db(void *ml, json_object *metricJ)
{
struct metrics_list *m_list = (struct metrics_list*)ml;
json_object *columnsJ = NULL, *valuesJ = NULL;
if(wrap_json_unpack(metricJ, "{ss, so, so!}",
"name", &m_list->serie.name,
"columns", &columnsJ,
"values", &valuesJ)) {
AFB_ApiError(m_list->api, "Unpacking metric goes wrong");
return;
}
wrap_json_array_for_all(columnsJ, fill_key, m_list);
wrap_json_array_for_all(valuesJ, fill_n_send_values, m_list);
}
static json_object *unpack_series(AFB_ApiT apiHandle, json_object *seriesJ)
{
struct metrics_list m_list = {
.serie = {
.name = NULL,
.serie_columns = {
.tags = NULL,
.fields = NULL
},
.timestamp = 0
},
.metricsJ = json_object_new_array(),
.api = apiHandle
};
wrap_json_array_for_all(seriesJ, unpack_metric_from_db, (void*)&m_list);
return m_list.metricsJ;
}
static void forward_to_garner(AFB_ApiT apiHandle, const char *result, size_t size)
{
int id = 0;
json_object *resultsJ = NULL,
*seriesJ = NULL,
*metrics2send = NULL,
*call_resultJ = 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_DEBUG("Unpacking results from influxdb request. Request results was:\n%s", result);
return;
}
if(seriesJ) {
metrics2send = unpack_series(apiHandle, seriesJ);
if(json_object_array_length(metrics2send)) {
if(AFB_ServiceSync(apiHandle, "garner", "write", metrics2send, &call_resultJ)) {
AFB_ApiError(apiHandle, "Metrics were sent but not done, an error happens. Details: %s", json_object_to_json_string(call_resultJ));
}
}
}
else {
AFB_ApiError(apiHandle, "Empty response. Request results was:\n%s", result);
}
}
static void influxdb_read_curl_cb(void *closure, int status, CURL *curl, const char *result, size_t size)
{
if(!closure)
return;
AFB_ApiT apiHandle = (AFB_ApiT)closure;
long rep_code = curl_wrap_response_code_get(curl);
switch(rep_code) {
case 200:
AFB_ApiDebug(apiHandle, "Read correctly done");
forward_to_garner(apiHandle, result, size);
break;
case 400:
AFB_ApiError(apiHandle, "Unacceptable request. %s", result);
break;
case 401:
AFB_ApiError(apiHandle, "Invalid authentication. %s", result);
break;
default:
AFB_ApiError(apiHandle, "Unexptected behavior. %s", result);
break;
}
}
static CURL *make_curl_query_get(AFB_ApiT apiHandle, 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";
strcat(query, "SELECT * FROM /^.*$/");
args[4] = NULL;
length_now = asprintf(&now, "%lu", get_ts());
int rootdir_fd = AFB_RootDirGetFD(apiHandle);
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_ApiError(apiHandle, "Error writing last_db_read file: %s\n", strerror( errno ));
}
else {
strcat(query, " 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_ApiError(apiHandle, "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;
}
static int influxdb_read(sd_event_source *s, uint64_t usec, void *userdata)
{
CURL *curl;
struct reader_args *r_args = NULL;
CtlSourceT *source = NULL;
if(userdata) {
source = (CtlSourceT*)userdata;
r_args = (struct reader_args*)source->context;
}
else {
return ERROR;
}
char url[URL_MAXIMUM_LENGTH]; /* Safe limit for most popular web browser */
make_url(url, sizeof(url), r_args->host, r_args->port, "query");
curl = make_curl_query_get(source->api, url);
curl_wrap_do(curl, influxdb_read_curl_cb, (void*)source->api);
/* Reschedule next run */
sd_event_source_set_time(s, usec + r_args->delay);
return 0;
}
CTLP_CAPI(read_from_influxdb, source, argsJ, eventJ)
{
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_GetEventLoop(source->api), CLOCK_MONOTONIC, &usec);
err = sd_event_add_time(AFB_GetEventLoop(source->api), &evtSource, CLOCK_MONOTONIC, usec+1000000, 250, influxdb_read, (void*)source);
if(!err)
err = sd_event_source_set_enabled(evtSource, SD_EVENT_ON);
return err;
}
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