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/*
* Copyright (C) 2018-2019 "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.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include "influxdb.h"
void influxdb_write_curl_cb(void* closure, int status, CURL* curl, const char* result, size_t size)
{
afb_req_t request = (afb_req_t)closure;
long rep_code = curl_wrap_response_code_get(curl);
switch (rep_code) {
case 204:
AFB_REQ_DEBUG(request, "Request correctly written");
afb_req_success(request, NULL, "Request has been successfully written");
break;
case 400:
afb_req_fail(request, "Bad request", result);
break;
case 401:
afb_req_fail(request, "Unauthorized access", result);
break;
case 404:
afb_req_fail(request, "Not found", result);
AFB_REQ_NOTICE(request, "Attempt to create the DB '" DEFAULT_DB "'");
create_database(request);
break;
case 500:
afb_req_fail_f(request, "Timeout", "Overloaded server: %s", result);
break;
default:
afb_req_fail_f(request, "Failure", "Unexpected behavior (code %ld).", rep_code);
break;
}
}
// query: destination buffer
// node: head node of the list
// list_sep: separator to append in front of the list
// item_sep: separator to append between items of the list
static void serialize_list_to_query(char* query, struct list* node, bool quoteString, const char* list_sep, const char* item_sep)
{
bool first = true;
while (node != NULL) {
if (first) {
concatenate(query, node->key, list_sep);
first = false;
} else {
concatenate(query, node->key, item_sep);
}
if (json_object_is_type(node->value, json_type_string))
concatenate_str(query, json_object_get_string(node->value), "=", quoteString);
else
concatenate(query, json_object_to_json_string(node->value), "=");
node = node->next;
}
}
static size_t format_write_args(char* query, struct series_t* serie)
{
char* ts;
strncat(query, serie->name, strlen(serie->name));
serialize_list_to_query(query, serie->serie_columns.tags, false, ",", ",");
serialize_list_to_query(query, serie->serie_columns.fields, true, " ", ",");
if (asprintf(&ts, "%lu", serie->timestamp) > 0) {
concatenate(query, ts, " ");
free(ts);
return strlen(query);
}
return -1;
}
CURL* make_curl_write_post(afb_api_t apiHandle, const char* url, json_object* metricsJ)
{
CURL* curl = NULL;
size_t lpd = 0, len_write = 0, i = 0;
char** post_data;
char* write = alloca(URL_MAXIMUM_LENGTH); // FIXME: better to use malloc and relloc bigger when needed
struct series_t* serie = NULL;
json_object* metricsArrayJ = NULL;
write[0] = '\0';
if (json_object_is_type(metricsJ, json_type_array)) {
lpd = json_object_array_length(metricsJ);
metricsArrayJ = metricsJ;
} else {
metricsArrayJ = json_object_new_array();
json_object_array_add(metricsArrayJ, metricsJ);
lpd = 1;
}
serie = malloc(sizeof(struct series_t));
post_data = calloc(lpd + 1, sizeof(void*));
for (i = 0; i < lpd; i++) {
memset(serie, 0, sizeof(struct series_t));
if (unpack_metric_from_api(json_object_array_get_idx(metricsArrayJ, i), serie)) {
AFB_API_ERROR(apiHandle, "ERROR unpacking metric. %s", json_object_to_json_string(metricsArrayJ));
break;
} else {
if (!serie->name) {
post_data[i] = NULL;
} else {
len_write = format_write_args(write, serie);
if (len_write > 0) {
post_data[i] = malloc(len_write + 1);
strncpy(post_data[i], write, len_write+1);
write[0] = '\0';
}
}
}
}
// Debugging purpose
// for (i = 0; i < lpd; i++) {
// AFB_API_DEBUG(apiHandle, "curl POST '%s' '%s' ", url, post_data[i]);
// }
/* Check that we just do not broke the for loop before trying preparing CURL
request object */
curl = i == lpd ? curl_wrap_prepare_post_unescaped(url, NULL, "\n", (const char* const*)post_data) : NULL;
free(serie);
for (i = 0; i < lpd; i++) {
if (post_data[i]) {
free(post_data[i]);
}
}
free(post_data);
return curl;
}
CURL* influxdb_write(afb_api_t apiHandle, const char* host, const char* port, json_object* metricJ)
{
char url[URL_MAXIMUM_LENGTH]; /* Safe limit for most popular web browser */
make_url_db(url, sizeof(url), host, port, "write", DEFAULT_DB);
return make_curl_write_post(apiHandle, url, metricJ);
}
CTLP_CAPI(write_to_influxdb, source, argsJ, eventJ)
{
afb_req_t request = source->request;
const char* port = NULL;
const char* host = NULL;
CURL* curl_request;
int rc = -1;
json_object *req_args = afb_req_json(request),
*portJ = NULL,
*metric = NULL;
if (wrap_json_unpack(req_args, "{s?s,s?o,so!}",
"host", &host,
"port", &portJ,
"metric", &metric)
|| !metric) {
afb_req_fail(request, "Failed", "Error processing arguments. Miss metric\
JSON object or malformed");
rc = -1;
} else {
port = json_object_is_type(portJ, json_type_null) ? NULL : json_object_to_json_string(portJ);
curl_request = influxdb_write(source->api, host, port, metric);
curl_wrap_do(curl_request, influxdb_write_curl_cb, request);
rc = 0;
}
return rc;
}
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