1 files changed, 125 insertions, 0 deletions
diff --git a/src/plugins/influxdb-reader.c b/src/plugins/influxdb-reader.c
new file mode 100644
index 0000000..bb56c93
--- /dev/null
+++ b/src/plugins/influxdb-reader.c
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2015, 2016, 2017, 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 <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <systemd/sd-event.h>
+
+#include "influxdb.h"
+
+CURL *make_curl_query_get(const char *url)
+{
+	CURL *curl;
+	char *args[5];
+	char *last_ts[30];
+
+	int fd_last_read = afb_daemon_rootdir_open_locale("last_db_read", O_CREAT, NULL);
+	if (fd_last_read < 0)
+		return NULL;
+
+	read(fd_last_read, last_ts, sizeof(last_ts));
+
+	args[0] = "epoch";
+	args[1] = "ns";
+	args[2] = "q";
+	args[3] = "SELECT * FROM /^.*$/";
+	args[4] = NULL;
+
+	curl = curl_wrap_prepare_get(url, NULL, (const char * const*)args);
+
+	return curl;
+}
+
+int unpack_metric_from_db(json_object *metric)
+{
+	const char *name;
+	json_object *columns = NULL, *values = NULL;
+
+	wrap_json_unpack(metric, "{ss, so, so!}",
+					 "name", &name,
+					 "columns", &columns,
+					 "values", &values);
+}
+
+int unpack_series(json_object *series)
+{
+	size_t length_series = json_object_array_length(series);
+
+}
+
+void forward_to_garner(const char *result, size_t size)
+{
+	int id = 0;
+
+	json_object *series = NULL,
+				*db_dump = json_tokener_parse(result);
+	wrap_json_unpack(db_dump, "{s[{si,so}]}",
+					 "id", &id,
+					 "series", &series);
+
+	unpack_series(series);
+
+}
+
+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 204:
+			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;
+	}
+}
+
+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 -1;
+
+	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);
+
+	return 0;
+}
+
+int influxdb_reader(void *args)
+{
+	uint64_t usec;
+	struct sd_event_source *evtSource;
+
+	/* Set a cyclic cb call each 1s to call the read callback */
+	sd_event_now(afb_daemon_get_event_loop(), CLOCK_MONOTONIC, &usec);
+	return sd_event_add_time(afb_daemon_get_event_loop(), &evtSource, CLOCK_MONOTONIC, usec+1000000, 250, influxdb_read, args);
+}