*/
-
+#include "common.h"
#include "sensor.h"
-#include "log.h"
#include <math.h>
/**
s->read_offset = 0;
s->id = id;
- #define FILENAMESIZE 4
+ #define FILENAMESIZE BUFSIZ
char filename[FILENAMESIZE];
- if (s->id >= pow(10, FILENAMESIZE))
+ //if (s->id >= pow(10, FILENAMESIZE))
+ if (false)
{
Fatal("Too many sensors! FILENAMESIZE is %d; increase it and recompile.", FILENAMESIZE);
}
{
Fatal("Wrote %d data points and expected to write %d to \"%s\" - %s", amount_written, SENSOR_DATABUFSIZ, strerror(errno));
}
- Log(LOGDEBUG, "Wrote %d data points for sensor %d", amount_written, s->id);
+ //Log(LOGDEBUG, "Wrote %d data points for sensor %d", amount_written, s->id);
pthread_mutex_unlock(&(s->mutex));
// End of critical section
return NULL;
}
+/**
+ * Fill buffer with most recent sensor data
+ * @param s - Sensor to use
+ * @param buffer - Buffer to fill
+ * @param bufsiz - Size of buffer to fill
+ * @returns The number of DataPoints actually read
+ */
+int Sensor_Query(Sensor * s, DataPoint * buffer, int bufsiz)
+{
+ int amount_read = 0;
+ //CRITICAL SECTION (Don't access file while sensor thread is writing to it!)
+ pthread_mutex_lock(&(s->mutex));
+
+ fseek(s->file, -bufsiz*sizeof(DataPoint), SEEK_END);
+ amount_read = fread(buffer, sizeof(DataPoint), bufsiz, s->file);
+ //Log(LOGDEBUG, "Read %d data points", amount_read);
+ pthread_mutex_unlock(&(s->mutex));
+ return amount_read;
+}
+
+/**
+ * Handle a request to the sensor module
+ * @param context - The context to work in
+ * @param params - Parameters passed
+ */
+void Sensor_Handler(FCGIContext *context, char * params)
+{
+ DataPoint buffer[SENSOR_QUERYBUFSIZ];
+ StatusCodes status = STATUS_OK;
+ const char * key; const char * value;
+
+ int sensor_id = SENSOR_NONE;
+
+ while ((params = FCGI_KeyPair(params, &key, &value)) != NULL)
+ {
+ Log(LOGDEBUG, "Got key=%s and value=%s", key, value);
+ if (strcmp(key, "id") == 0)
+ {
+ char *end;
+ if (sensor_id != SENSOR_NONE)
+ {
+ Log(LOGERR, "Only one sensor id should be specified");
+ status = STATUS_ERROR;
+ break;
+ }
+ if (*value == '\0')
+ {
+ Log(LOGERR, "No id specified.");
+ status = STATUS_ERROR;
+ break;
+ }
+ //TODO: Use human readable sensor identifier string for API?
+ sensor_id = strtol(value, &end, 10);
+ if (*end != '\0')
+ {
+ Log(LOGERR, "Sensor id not an integer; %s", value);
+ status = STATUS_ERROR;
+ break;
+ }
+ }
+ else
+ {
+ Log(LOGERR, "Unknown key \"%s\" (value = %s)", key, value);
+ status = STATUS_ERROR;
+ break;
+ }
+ }
+
+ if (sensor_id == SENSOR_NONE)
+ {
+ Log(LOGERR, "No sensor id specified");
+ status = STATUS_ERROR;
+ }
+ else if (sensor_id >= NUMSENSORS || sensor_id < 0)
+ {
+ Log(LOGERR, "Invalid sensor id %d", sensor_id);
+ status = STATUS_ERROR;
+ }
+ if (status == STATUS_ERROR)
+ {
+ FCGI_RejectJSON(context);
+ }
+ else
+ {
+ FCGI_BeginJSON(context, status);
+ FCGI_JSONPair(key, value); // should spit back sensor ID
+ //Log(LOGDEBUG, "Call Sensor_Query...");
+ int amount_read = Sensor_Query(&(g_sensors[sensor_id]), buffer, SENSOR_QUERYBUFSIZ);
+ //Log(LOGDEBUG, "Read %d DataPoints", amount_read);
+ //Log(LOGDEBUG, "Produce JSON response");
+ FCGI_JSONKey("data");
+ FCGI_JSONValue("[");
+ for (int i = 0; i < amount_read; ++i)
+ {
+ FCGI_JSONValue("[%f, %f]", buffer[i].time, buffer[i].value);
+ if (i+1 < amount_read)
+ FCGI_JSONValue(",");
+ }
+ FCGI_JSONValue("]");
+ //Log(LOGDEBUG, "Done producing JSON response");
+ FCGI_EndJSON();
+ }
+}