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
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
/*
* 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;
};
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_ERROR("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_ERROR("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(json_object *seriesJ)
{
struct metrics_list m_list = {
.serie = {
.name = NULL,
.serie_columns = {
.tags = NULL,
.fields = NULL
},
.timestamp = 0
},
.metricsJ = json_object_new_array()
};
wrap_json_array_for_all(seriesJ, unpack_metric_from_db, (void*)&m_list);
return m_list.metricsJ;
}
static void forward_to_garner(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(seriesJ);
if(json_object_array_length(metrics2send)) {
if(afb_service_call_sync("garner", "write", metrics2send, &call_resultJ)) {
AFB_ERROR("Metrics were sent but not done, an error happens. Details: %s", json_object_to_json_string(call_resultJ));
}
}
}
else {
AFB_ERROR("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)
{
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;
}
}
static 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";
strcat(query, "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 {
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_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;
}
static 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;
}
|
