102 lines
2.7 KiB
C
102 lines
2.7 KiB
C
#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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#include "taosudf.h"
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#define STR_MAX_LEN 256 // inter buffer length
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// init
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DLL_EXPORT int32_t max_vol_init()
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{
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return 0;
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}
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// destory
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DLL_EXPORT int32_t max_vol_destroy()
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{
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return 0;
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}
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// start
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DLL_EXPORT int32_t max_vol_start(SUdfInterBuf *buf)
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{
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memset(buf->buf, 0, sizeof(float) + STR_MAX_LEN);
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// set init value
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*((float*)buf->buf) = -10000000;
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buf->bufLen = sizeof(float) + STR_MAX_LEN;
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buf->numOfResult = 0;
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return 0;
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}
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DLL_EXPORT int32_t max_vol(SUdfDataBlock *block, SUdfInterBuf *interBuf, SUdfInterBuf *newInterBuf) {
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float maxValue = *(float *)interBuf->buf;
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char strBuff[STR_MAX_LEN] = "inter1buf";
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if (block->numOfCols < 2)
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{
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return TSDB_CODE_UDF_INVALID_INPUT;
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}
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// check data type
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for (int32_t i = 0; i < block->numOfCols; ++i)
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{
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SUdfColumn *col = block->udfCols[i];
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if( i == block->numOfCols - 1) {
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// last column is device id , must varchar
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if (col->colMeta.type != TSDB_DATA_TYPE_VARCHAR ) {
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return TSDB_CODE_UDF_INVALID_INPUT;
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}
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} else {
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if (col->colMeta.type != TSDB_DATA_TYPE_FLOAT) {
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return TSDB_CODE_UDF_INVALID_INPUT;
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}
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}
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}
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// calc max voltage
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SUdfColumn *lastCol = block->udfCols[block->numOfCols - 1];
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for (int32_t i = 0; i < (block->numOfCols - 1); ++i) {
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for (int32_t j = 0; j < block->numOfRows; ++j) {
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SUdfColumn *col = block->udfCols[i];
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if (udfColDataIsNull(col, j)) {
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continue;
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}
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char *data = udfColDataGetData(col, j);
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float voltage = *(float *)data;
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if (voltage > maxValue) {
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maxValue = voltage;
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char *valData = udfColDataGetData(lastCol, j);
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// get device id
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char *deviceId = valData + sizeof(uint16_t);
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sprintf(strBuff, "%s_(%d,%d)_%f", deviceId, j, i, maxValue);
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}
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}
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}
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*(float*)newInterBuf->buf = maxValue;
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strcpy(newInterBuf->buf + sizeof(float), strBuff);
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newInterBuf->bufLen = sizeof(float) + strlen(strBuff)+1;
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newInterBuf->numOfResult = 1;
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return 0;
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}
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DLL_EXPORT int32_t max_vol_finish(SUdfInterBuf *buf, SUdfInterBuf *resultData)
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{
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char * str = buf->buf + sizeof(float);
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// copy to des
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char * des = resultData->buf + sizeof(uint16_t);
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strcpy(des, str);
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// set binary type len
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uint16_t len = strlen(str);
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*((uint16_t*)resultData->buf) = len;
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// set buf len
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resultData->bufLen = len + sizeof(uint16_t);
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// set row count
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resultData->numOfResult = 1;
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return 0;
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}
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