1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
/*
* 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 <string.h>
#include <stdio.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(request, "Failure", "Unexpected behavior.");
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, 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), "=");
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, ",", ",");
serialize_list_to_query(query, serie->serie_columns.fields, " ", ",");
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[URL_MAXIMUM_LENGTH] = "";
struct series_t *serie = NULL;
json_object *metricsArrayJ = NULL;
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);
strcpy(post_data[i], write);
memset(write, 0, len_write);
}
}
}
}
/* 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(url, sizeof(url), host, port, "write");
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;
}
|
