X-Git-Url: https://git.tokkee.org/?p=sysdb.git;a=blobdiff_plain;f=src%2Fcore%2Ftimeseries.c;h=9574ee8a75fd13b188b091af15ad2e52654c5803;hp=48da7f8dab9e47a4ad12b77f8df65bf39fc117bc;hb=288e7cfdab0c31ff49d9bc10ec51ceb32f476014;hpb=b3c5403f90933d3d63ebaf9174524fa018a50f4f

diff --git a/src/core/timeseries.c b/src/core/timeseries.c
index 48da7f8..9574ee8 100644
--- a/src/core/timeseries.c
+++ b/src/core/timeseries.c
@@ -1,6 +1,6 @@
 /*
  * SysDB - src/core/timeseries.c
- * Copyright (C) 2014 Sebastian 'tokkee' Harl <sh@tokkee.org>
+ * Copyright (C) 2014-2016 Sebastian 'tokkee' Harl <sh@tokkee.org>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -31,13 +31,76 @@
 
 #include "sysdb.h"
 #include "core/timeseries.h"
+#include "utils/strings.h"
 
 #include <stdlib.h>
+#include <string.h>
+#include <math.h>
 
 /*
  * public API
  */
 
+sdb_timeseries_info_t *
+sdb_timeseries_info_create(size_t data_names_len, const char * const *data_names)
+{
+	sdb_timeseries_info_t *ts_info;
+
+	ts_info = calloc(1, sizeof(*ts_info));
+	if (! ts_info)
+		return NULL;
+
+	if (stringv_copy(&ts_info->data_names, &ts_info->data_names_len,
+				data_names, data_names_len)) {
+		sdb_timeseries_info_destroy(ts_info);
+		return NULL;
+	}
+	return ts_info;
+} /* sdb_timeseries_info_create */
+
+void
+sdb_timeseries_info_destroy(sdb_timeseries_info_t *ts_info)
+{
+	if (! ts_info)
+		return;
+
+	stringv_free(&ts_info->data_names, &ts_info->data_names_len);
+	free(ts_info);
+} /* sdb_timeseries_info_destroy */
+
+sdb_timeseries_t *
+sdb_timeseries_create(size_t data_names_len, const char * const *data_names,
+		size_t data_len)
+{
+	sdb_timeseries_t *ts;
+	size_t i;
+
+	ts = calloc(1, sizeof(*ts));
+	if (! ts)
+		return NULL;
+
+	if (stringv_copy(&ts->data_names, &ts->data_names_len,
+				data_names, data_names_len)) {
+		sdb_timeseries_destroy(ts);
+		return NULL;
+	}
+
+	ts->data = calloc(data_names_len, sizeof(*ts->data));
+	if (! ts->data) {
+		sdb_timeseries_destroy(ts);
+		return NULL;
+	}
+	for (i = 0; i < data_names_len; ++i) {
+		ts->data[i] = calloc(data_len, sizeof(**ts->data));
+		if (! ts->data[i]) {
+			sdb_timeseries_destroy(ts);
+			return NULL;
+		}
+	}
+	ts->data_len = data_len;
+	return ts;
+} /* sdb_timeseries_create */
+
 void
 sdb_timeseries_destroy(sdb_timeseries_t *ts)
 {
@@ -46,21 +109,74 @@ sdb_timeseries_destroy(sdb_timeseries_t *ts)
 	if (! ts)
 		return;
 
-	if (ts->data)
+	if (ts->data) {
+		for (i = 0; i < ts->data_names_len; ++i) {
+			if (ts->data[i])
+				free(ts->data[i]);
+			ts->data[i] = NULL;
+		}
 		free(ts->data);
+	}
 	ts->data = NULL;
 	ts->data_len = 0;
 
+	stringv_free(&ts->data_names, &ts->data_names_len);
+	free(ts);
+} /* sdb_timeseries_destroy */
+
+int
+sdb_timeseries_tojson(sdb_timeseries_t *ts, sdb_strbuf_t *buf)
+{
+	char start_str[64];
+	char end_str[64];
+
+	size_t i;
+
+	if ((! ts) || (! buf))
+		return -1;
+
+	/* TODO: make time format configurable */
+	if (! sdb_strftime(start_str, sizeof(start_str), ts->start))
+		snprintf(start_str, sizeof(start_str), "<error>");
+	start_str[sizeof(start_str) - 1] = '\0';
+	if (! sdb_strftime(end_str, sizeof(end_str), ts->end))
+		snprintf(end_str, sizeof(end_str), "<error>");
+	end_str[sizeof(end_str) - 1] = '\0';
+
+	sdb_strbuf_append(buf, "{\"start\": \"%s\", \"end\": \"%s\", \"data\": {",
+			start_str, end_str);
+
 	for (i = 0; i < ts->data_names_len; ++i) {
-		if (ts->data_names[i])
-			free(ts->data_names[i]);
-		ts->data_names[i] = NULL;
+		size_t j;
+		sdb_strbuf_append(buf, "\"%s\": [", ts->data_names[i]);
+
+		for (j = 0; j < ts->data_len; ++j) {
+			char time_str[64];
+
+			if (! sdb_strftime(time_str, sizeof(time_str), ts->data[i][j].timestamp))
+				snprintf(time_str, sizeof(time_str), "<error>");
+			time_str[sizeof(time_str) - 1] = '\0';
+
+			/* Some GNU libc versions may print '-nan' which we dont' want */
+			if (isnan(ts->data[i][j].value))
+				sdb_strbuf_append(buf, "{\"timestamp\": \"%s\", "
+						"\"value\": \"nan\"}", time_str);
+			else
+				sdb_strbuf_append(buf, "{\"timestamp\": \"%s\", "
+						"\"value\": \"%f\"}", time_str, ts->data[i][j].value);
+
+			if (j < ts->data_len - 1)
+				sdb_strbuf_append(buf, ",");
+		}
+
+		if (i < ts->data_names_len - 1)
+			sdb_strbuf_append(buf, "],");
+		else
+			sdb_strbuf_append(buf, "]");
 	}
-	if (ts->data_names)
-		free(ts->data_names);
-	ts->data_names = NULL;
-	ts->data_names_len = 0;
-} /* sdb_timeseries_destroy */
+	sdb_strbuf_append(buf, "}}");
+	return 0;
+} /* sdb_timeseries_tojson */
 
 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */