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/*
* Copyright (C) 2015, 2016 "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 "harvester.h"
#include "harvester-apidef.h"
#include <string.h>
#include <stdio.h>
#include "curl-wrap.h"
#include "wrap-json.h"
#define DEFAULT_DB "agl-collector"
#define DEFAULT_DBHOST "localhost"
#define DEFAULT_DBPORT "8086"
#define URL_MAXIMUM_LENGTH 2047
int dbping()
{
int ret = 0;
char *result;
size_t result_size;
CURL *request = curl_wrap_prepare_get("localhost:"DEFAULT_DBPORT"/ping",NULL, NULL);
curl_wrap_perform(request, &result, &result_size);
if(curl_wrap_response_code_get(request) != 204) {
AFB_ERROR("TimeSeries DB not reachable");
ret = -1;
}
curl_easy_cleanup(request);
return ret;
}
int create_database()
{
int ret = 0;
char *result;
size_t result_size;
// Declare query to be posted
const char **post_data;
post_data = malloc(sizeof(*post_data));
post_data[0] = "q=CREATE DATABASE \""DEFAULT_DB"\"";
post_data[1] = NULL;
CURL *request = curl_wrap_prepare_post("localhost:"DEFAULT_DBPORT"/query",NULL, 1, post_data);
curl_wrap_perform(request, &result, &result_size);
if(curl_wrap_response_code_get(request) != 200) {
AFB_ERROR("Can't create database.");
ret = -1;
}
curl_easy_cleanup(request);
free(post_data);
if(ret == 0)
AFB_NOTICE("Database 'agl-collector' created");
return ret;
}
void curl_cb(void *closure, int status, CURL *curl, const char *result, size_t size)
{
struct afb_req *req = (struct afb_req*)closure;
long rep_code = curl_wrap_response_code_get(curl);
switch(rep_code) {
case 204:
AFB_DEBUG("Request correctly written");
afb_req_success(*req, NULL, "Request has been successfully writen");
break;
case 400:
afb_req_fail(*req, "Bad request", result);
break;
case 401:
afb_req_fail(*req, "Unauthorized access", result);
break;
case 404:
afb_req_fail(*req, "Not found", result);
AFB_NOTICE("Attempt to create the DB '"DEFAULT_DB"'");
create_database();
break;
case 500:
afb_req_fail_f(*req, "Timeout", "Overloaded server: %s", result);
break;
default:
afb_req_fail(*req, "Failure", "Unexpected behavior.");
break;
}
}
int unpack_metric(json_object *m, const char **name, const char **source, const char **unit, const char **identity, json_object **jv, uint64_t *timestamp)
{
if (wrap_json_unpack(m, "{ss,s?s,s?s,s?s,so,sI!}",
"name", name,
"source", source,
"unit", unit,
"identity", identity,
"value", jv,
"timestamp", timestamp))
return -1;
else if (!json_object_is_type(*jv, json_type_boolean) &&
!json_object_is_type(*jv, json_type_double) &&
!json_object_is_type(*jv, json_type_int) &&
!json_object_is_type(*jv, json_type_string))
return -1;
return 0;
}
void concatenate(char* dest, const char* source, const char *sep)
{
strncat(dest, sep, strlen(sep));
strncat(dest, source, strlen(source));
}
char *make_query(char *query, const char *name, const char *source, const char *unit, const char *identity, json_object *jv, uint64_t timestamp)
{
char *ts;
memset(query, 0, URL_MAXIMUM_LENGTH);
strncat(query, name, strlen(name));
if (source) {
concatenate(query, source, ",");
}
if (unit) {
concatenate(query, unit, ",");
}
if (identity) {
concatenate(query, identity, ",");
}
concatenate(query, "value", " ");
concatenate(query, json_object_to_json_string(jv), "=");
asprintf(&ts, "%lu", timestamp);
concatenate(query, ts, " ");
return query;
}
CURL *make_curl_write_post(const char *url, struct json_object *metric)
{
CURL *curl;
const char *name = NULL,
*source = NULL,
*unit = NULL,
*identity = NULL;
char *post_data[2], query[URL_MAXIMUM_LENGTH];
bzero(query, URL_MAXIMUM_LENGTH);
json_object *jv = NULL;
uint64_t timestamp = 0;
if(unpack_metric(metric, &name, &source, &unit, &identity, &jv, ×tamp)) {
AFB_ERROR("ERROR unpacking metric. %s", json_object_to_json_string(metric));
curl = NULL;
}
else {
make_query(query, name, source, unit, identity, jv, timestamp);
post_data[0] = query;
post_data[1] = NULL;
curl = curl_wrap_prepare_post(url, NULL, 1, (const char * const*)post_data);
}
return curl;
}
int do_write(struct afb_req req, const char* host, int port, json_object *metric)
{
CURL *curl_request;
char url[URL_MAXIMUM_LENGTH]; // Safe limit for most popular web browser
memset(url, 0, sizeof(url));
// Handle default host and port
host = host ? host : DEFAULT_DBHOST;
port = port > 0 ? port : atoi(DEFAULT_DBPORT);
strncat(url, host, strlen(host));
strncat(url, ":"DEFAULT_DBPORT"/write?db="DEFAULT_DB, strlen(":"DEFAULT_DBPORT"/write?db="DEFAULT_DB));
curl_request = make_curl_write_post(url, metric);
curl_wrap_do(curl_request, curl_cb, &req);
return 0;
}
void write(struct afb_req req)
{
int port = -1;
const char *host = NULL;
json_object *req_args = afb_req_json(req),
*metric = NULL;
if(wrap_json_unpack(req_args, "{s?s,s?i,so!}",
"host", &host,
"port", &port,
"metric", &metric) || ! metric)
afb_req_fail(req, "Failed", "Error processing arguments. Miss metric\
JSON object or malformed");
else if(do_write(req, host, port, metric))
afb_req_fail(req, "Failed", "Error processing metric JSON object.\
Malformed !");
}
void auth(struct afb_req request)
{
afb_req_session_set_LOA(request, 1);
afb_req_success(request, NULL, NULL);
}
int init()
{
int err = 0;
err = curl_global_init(CURL_GLOBAL_DEFAULT);
if (!err)
err = dbping();
else {
AFB_ERROR("Something went wrong initiliazing libcurl. Abort");
}
return err;
}
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