X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=server%2Fdata.c;h=19828bc0492b4c5e93719d06f1e9f3f348ec04f4;hb=6bc90047ed36b392d90a1bf778baf9687b835f2d;hp=c4d7b584302ba9f786ad4dd21c3550d136d54931;hpb=1a311e29d6b72830d62e2cba21c1b9e33433cfbf;p=matches%2FMCTX3420.git

diff --git a/server/data.c b/server/data.c
index c4d7b58..19828bc 100644
--- a/server/data.c
+++ b/server/data.c
@@ -1,6 +1,6 @@
 /**
  * @file data.c
- * @purpose Implementation of data handling functions; saving, loading, displaying, selecting.
+ * @brief Implementation of data handling functions; saving, loading, displaying, selecting.
  */
 
 #include "data.h"
@@ -13,8 +13,8 @@
 void Data_Init(DataFile * df)
 {
 	// Everything is NULL
-	df->filename = NULL;
-	df->file = NULL;
+	memset(df, 0, sizeof(DataFile));
+	pthread_mutex_init(&(df->mutex), NULL);
 }
 
 /**
@@ -161,13 +161,13 @@ void Data_PrintByIndexes(DataFile * df, int start_index, int end_index, DataForm
 	switch (format)
 	{
 		case JSON:
-			fmt_string = "[%f,%f]";
+			fmt_string = "[%.9f,%f]";
 			separator = ',';
 			// For JSON we need an opening bracket
 			FCGI_PrintRaw("["); 
 			break;
 		case TSV:
-			fmt_string = "%f\t%f";
+			fmt_string = "%.9f\t%f";
 			separator = '\n';
 			break;
 	}
@@ -285,3 +285,122 @@ int Data_FindByTime(DataFile * df, double time_stamp, DataPoint * closest)
 	return index;
 	
 }
+
+/**
+ * Helper; handle FCGI response that requires data
+ * Should be called first.
+ * @param df - DataFile to access
+ * @param start - Info about start_time param 
+ * @param end - Info about end_time param
+ * @param fmt - Info about format param
+ * @param current_time - Current time
+ */
+void Data_Handler(DataFile * df, FCGIValue * start, FCGIValue * end, DataFormat format, double current_time)
+{
+	double start_time = *(double*)(start->value);
+	double end_time = *(double*)(end->value);
+
+	if (format == JSON)
+	{
+		FCGI_JSONKey("data");
+	}
+
+	// If a time was specified
+	if (FCGI_RECEIVED(start->flags) || FCGI_RECEIVED(end->flags))
+	{
+		// Wrap times relative to the current time
+		if (start_time < 0)
+			start_time += current_time;
+		if (end_time < 0)
+			end_time += current_time;
+
+		// Print points by time range
+		Data_PrintByTimes(df, start_time, end_time, format);
+
+	}
+	else // No time was specified; just return a recent set of points
+	{
+		pthread_mutex_lock(&(df->mutex));
+			int start_index = df->num_points-DATA_BUFSIZ;
+			int end_index = df->num_points-1;
+		pthread_mutex_unlock(&(df->mutex));
+
+		// Bounds check
+		if (start_index < 0)
+			start_index = 0;
+		if (end_index < 0)
+			end_index = 0;
+
+		// Print points by indexes
+		Data_PrintByIndexes(df, start_index, end_index, format);
+	}
+
+}
+
+/**
+ * Helper - Convert human readable format string to DataFormat
+ * @param fmt - FCGIValue to use
+ */
+DataFormat Data_GetFormat(FCGIValue * fmt)
+{
+	const char * fmt_str = *(const char**)(fmt->value);
+	// Check if format type was specified
+	if (FCGI_RECEIVED(fmt->flags))
+	{
+		if (strcmp(fmt_str, "json") == 0)
+			return JSON;
+		else if (strcmp(fmt_str, "tsv") == 0)
+			return TSV;
+		else
+			Log(LOGERR, "Unknown format type \"%s\"", fmt_str);
+	}
+	return JSON;
+}
+
+/**
+ * Binary search for index of a double in an array
+ * @param value - The value
+ * @param x - The array
+ * @param size - Sizeof the array
+ */
+int FindClosest(double value, double x[], int size)
+{
+	int upper = size-1;
+	int lower = 0;
+	int index = 0;
+	while (upper - lower > 1)
+	{
+		index = lower + ((upper - lower)/2);
+		double look = x[index];
+		if (look > value)
+			upper = index;
+		else if (look < value)
+			lower = index;
+		else
+			return index;
+	}
+
+	if (x[index] > value && index > 0)
+		--index;
+	return index;
+
+}
+
+/**
+ * Get calibrated value by interpolation in array y
+ * @param value - Raw measured value
+ * @param x - x values (raw values) of the data
+ * @param y - calibrated values
+ * @param size - Number of values in the arrays
+ * @returns interpolated calibrated value
+ */
+double Data_Calibrate(double value, double x[], double y[], int size)
+{
+	int i = FindClosest(value, x, size);
+	if (i >= size-1)
+	{
+		i = size-2;	
+	}
+	double dist = (value - x[i])/(x[i+1] - x[i]);
+	return y[i] + dist*(y[i+1]-y[i]);
+}