ttszip.c 32.6 KB
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#include "ttszip.h"
#include <tglobal.h>
#include "taoserror.h"
#include "tcompression.h"
#include "tutil.h"

static int32_t getDataStartOffset();
static void TSBufUpdateGroupInfo(STSBuf* pTSBuf, int32_t index, STSGroupBlockInfo* pBlockInfo);
static STSBuf* allocResForTSBuf(STSBuf* pTSBuf);
static int32_t STSBufUpdateHeader(STSBuf* pTSBuf, STSBufFileHeader* pHeader);

/**
 * todo error handling
 * support auto closeable tmp file
 * @param path
 * @return
 */
STSBuf* tsBufCreate(bool autoDelete, int32_t order) {
  STSBuf* pTSBuf = calloc(1, sizeof(STSBuf));
  if (pTSBuf == NULL) {
    return NULL;
  }

  pTSBuf->autoDelete = autoDelete;
  
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  taosGetTmpfilePath(tsTempDir, "join", pTSBuf->path);
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  // pTSBuf->pFile = fopen(pTSBuf->path, "wb+");
  pTSBuf->pFile = taosOpenFile(pTSBuf->path, TD_FILE_CTEATE | TD_FILE_WRITE | TD_FILE_READ | TD_FILE_TRUNC);
  if (pTSBuf->pFile == NULL) {
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    free(pTSBuf);
    return NULL;
  }

  if (!autoDelete) {
    remove(pTSBuf->path);
  }
  
  if (NULL == allocResForTSBuf(pTSBuf)) {
    return NULL;
  }
  
  // update the header info
  STSBufFileHeader header = {.magic = TS_COMP_FILE_MAGIC, .numOfGroup = pTSBuf->numOfGroups, .tsOrder = TSDB_ORDER_ASC};
  STSBufUpdateHeader(pTSBuf, &header);
  
  tsBufResetPos(pTSBuf);
  pTSBuf->cur.order = TSDB_ORDER_ASC;

  pTSBuf->tsOrder = order;
  
  return pTSBuf;
}

STSBuf* tsBufCreateFromFile(const char* path, bool autoDelete) {
  STSBuf* pTSBuf = calloc(1, sizeof(STSBuf));
  if (pTSBuf == NULL) {
    return NULL;
  }

  pTSBuf->autoDelete = autoDelete;
  
  tstrncpy(pTSBuf->path, path, sizeof(pTSBuf->path));
  
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  // pTSBuf->pFile = fopen(pTSBuf->path, "rb+");
  pTSBuf->pFile = taosOpenFile(pTSBuf->path, TD_FILE_WRITE | TD_FILE_READ);
  if (pTSBuf->pFile == NULL) {
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    free(pTSBuf);
    return NULL;
  }
  
  if (allocResForTSBuf(pTSBuf) == NULL) {
    return NULL;
  }
  
  // validate the file magic number
  STSBufFileHeader header = {0};
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  int32_t ret = taosLSeekFile(pTSBuf->pFile, 0, SEEK_SET);
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  UNUSED(ret);
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  size_t sz = taosReadFile(pTSBuf->pFile, &header, sizeof(STSBufFileHeader));
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  UNUSED(sz);

  // invalid file
  if (header.magic != TS_COMP_FILE_MAGIC) {
    tsBufDestroy(pTSBuf);
    return NULL;
  }
  
  if (header.numOfGroup > pTSBuf->numOfAlloc) {
    pTSBuf->numOfAlloc = header.numOfGroup;
    STSGroupBlockInfoEx* tmp = realloc(pTSBuf->pData, sizeof(STSGroupBlockInfoEx) * pTSBuf->numOfAlloc);
    if (tmp == NULL) {
      tsBufDestroy(pTSBuf);
      return NULL;
    }
    
    pTSBuf->pData = tmp;
  }
  
  pTSBuf->numOfGroups = header.numOfGroup;
  
  // check the ts order
  pTSBuf->tsOrder = header.tsOrder;
  if (pTSBuf->tsOrder != TSDB_ORDER_ASC && pTSBuf->tsOrder != TSDB_ORDER_DESC) {
//    tscError("invalid order info in buf:%d", pTSBuf->tsOrder);
    tsBufDestroy(pTSBuf);
    return NULL;
  }
  
  size_t infoSize = sizeof(STSGroupBlockInfo) * pTSBuf->numOfGroups;
  
  STSGroupBlockInfo* buf = (STSGroupBlockInfo*)calloc(1, infoSize);
  if (buf == NULL) {
    tsBufDestroy(pTSBuf);
    return NULL; 
  } 
  
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  //int64_t pos = ftell(pTSBuf->pFile); //pos not used
  sz = taosReadFile(pTSBuf->pFile, buf, infoSize);
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  UNUSED(sz);
  
  // the length value for each vnode is not kept in file, so does not set the length value
  for (int32_t i = 0; i < pTSBuf->numOfGroups; ++i) {
    STSGroupBlockInfoEx* pBlockList = &pTSBuf->pData[i];
    memcpy(&pBlockList->info, &buf[i], sizeof(STSGroupBlockInfo));
  }
  free(buf);
  
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  ret = taosLSeekFile(pTSBuf->pFile, 0, SEEK_END);
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  UNUSED(ret);
  
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  int64_t file_size;
  if (taosFStatFile(pTSBuf->pFile, &file_size, NULL) != 0) {
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    tsBufDestroy(pTSBuf);
    return NULL;
  }
  
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  pTSBuf->fileSize = (uint32_t)file_size;
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  tsBufResetPos(pTSBuf);
  
  // ascending by default
  pTSBuf->cur.order = TSDB_ORDER_ASC;
  
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//  tscDebug("create tsBuf from file:%s, fd:%d, size:%d, numOfGroups:%d, autoDelete:%d", pTSBuf->path, fileno(pTSBuf->pFile),
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//           pTSBuf->fileSize, pTSBuf->numOfGroups, pTSBuf->autoDelete);
  
  return pTSBuf;
}

void* tsBufDestroy(STSBuf* pTSBuf) {
  if (pTSBuf == NULL) {
    return NULL;
  }
  
  tfree(pTSBuf->assistBuf);
  tfree(pTSBuf->tsData.rawBuf);
  
  tfree(pTSBuf->pData);
  tfree(pTSBuf->block.payload);

  if (!pTSBuf->remainOpen) {
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    taosCloseFile(&pTSBuf->pFile);
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  }
  
  if (pTSBuf->autoDelete) {
//    ("tsBuf %p destroyed, delete tmp file:%s", pTSBuf, pTSBuf->path);
    remove(pTSBuf->path);
  } else {
//    tscDebug("tsBuf %p destroyed, tmp file:%s, remains", pTSBuf, pTSBuf->path);
  }

  taosVariantDestroy(&pTSBuf->block.tag);
  free(pTSBuf);
  return NULL;
}

static STSGroupBlockInfoEx* tsBufGetLastGroupInfo(STSBuf* pTSBuf) {
  int32_t last = pTSBuf->numOfGroups - 1;
  
  assert(last >= 0);
  return &pTSBuf->pData[last];
}

static STSGroupBlockInfoEx* addOneGroupInfo(STSBuf* pTSBuf, int32_t id) {
  if (pTSBuf->numOfAlloc <= pTSBuf->numOfGroups) {
    uint32_t newSize = (uint32_t)(pTSBuf->numOfAlloc * 1.5);
    assert((int32_t)newSize > pTSBuf->numOfAlloc);
    
    STSGroupBlockInfoEx* tmp = (STSGroupBlockInfoEx*)realloc(pTSBuf->pData, sizeof(STSGroupBlockInfoEx) * newSize);
    if (tmp == NULL) {
      return NULL;
    }
    
    pTSBuf->pData = tmp;
    pTSBuf->numOfAlloc = newSize;
    memset(&pTSBuf->pData[pTSBuf->numOfGroups], 0, sizeof(STSGroupBlockInfoEx) * (newSize - pTSBuf->numOfGroups));
  }
  
  if (pTSBuf->numOfGroups > 0) {
    STSGroupBlockInfoEx* pPrevBlockInfoEx = tsBufGetLastGroupInfo(pTSBuf);
    
    // update prev vnode length info in file
    TSBufUpdateGroupInfo(pTSBuf, pTSBuf->numOfGroups - 1, &pPrevBlockInfoEx->info);
  }
  
  // set initial value for vnode block
  STSGroupBlockInfo* pBlockInfo = &pTSBuf->pData[pTSBuf->numOfGroups].info;
  pBlockInfo->id = id;
  pBlockInfo->offset = pTSBuf->fileSize;
  assert(pBlockInfo->offset >= getDataStartOffset());
  
  // update vnode info in file
  TSBufUpdateGroupInfo(pTSBuf, pTSBuf->numOfGroups, pBlockInfo);
  
  // add one vnode info
  pTSBuf->numOfGroups += 1;
  
  // update the header info
  STSBufFileHeader header = {
      .magic = TS_COMP_FILE_MAGIC, .numOfGroup = pTSBuf->numOfGroups, .tsOrder = pTSBuf->tsOrder};
  
  STSBufUpdateHeader(pTSBuf, &header);
  return tsBufGetLastGroupInfo(pTSBuf);
}

static void shrinkBuffer(STSList* ptsData) {
  // shrink tmp buffer size if it consumes too many memory compared to the pre-defined size
  if (ptsData->allocSize >= ptsData->threshold * 2) {
    char* rawBuf = realloc(ptsData->rawBuf, MEM_BUF_SIZE);
    if(rawBuf) {
      ptsData->rawBuf = rawBuf;
      ptsData->allocSize = MEM_BUF_SIZE;
    }
  }
}

static int32_t getTagAreaLength(SVariant* pa) {
  int32_t t = sizeof(pa->nLen) * 2 + sizeof(pa->nType);
  if (pa->nType != TSDB_DATA_TYPE_NULL) {
    t += pa->nLen;
  }

  return t;
}

static void writeDataToDisk(STSBuf* pTSBuf) {
  if (pTSBuf->tsData.len == 0) {
    return;
  }
  
  STSBlock* pBlock = &pTSBuf->block;
  STSList*  pTsData = &pTSBuf->tsData;

  pBlock->numOfElem = pTsData->len / TSDB_KEYSIZE;
  pBlock->compLen =
      tsCompressTimestamp(pTsData->rawBuf, pTsData->len, pTsData->len/TSDB_KEYSIZE, pBlock->payload, pTsData->allocSize,
          TWO_STAGE_COMP, pTSBuf->assistBuf, pTSBuf->bufSize);
  
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  int64_t r = taosLSeekFile(pTSBuf->pFile, pTSBuf->fileSize, SEEK_SET);
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  assert(r == 0);
  
  /*
   * format for output data:
   * 1. tags, number of ts, size after compressed, payload, size after compressed
   * 2. tags, number of ts, size after compressed, payload, size after compressed
   *
   * both side has the compressed length is used to support load data forwards/backwords.
   */
  int32_t metaLen = 0;
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  metaLen += (int32_t)taosWriteFile(pTSBuf->pFile, &pBlock->tag.nType, sizeof(pBlock->tag.nType));
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  int32_t trueLen = pBlock->tag.nLen;
  if (pBlock->tag.nType == TSDB_DATA_TYPE_BINARY || pBlock->tag.nType == TSDB_DATA_TYPE_NCHAR) {
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    metaLen += (int32_t)taosWriteFile(pTSBuf->pFile, &pBlock->tag.nLen, sizeof(pBlock->tag.nLen));
    metaLen += (int32_t)taosWriteFile(pTSBuf->pFile, pBlock->tag.pz, (size_t)pBlock->tag.nLen);
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  } else if (pBlock->tag.nType == TSDB_DATA_TYPE_FLOAT) {
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    metaLen += (int32_t)taosWriteFile(pTSBuf->pFile, &pBlock->tag.nLen, sizeof(pBlock->tag.nLen));
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    float tfloat = (float)pBlock->tag.d;
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    metaLen += (int32_t)taosWriteFile(pTSBuf->pFile, &tfloat, (size_t) pBlock->tag.nLen);  
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  } else if (pBlock->tag.nType != TSDB_DATA_TYPE_NULL) {
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    metaLen += (int32_t)taosWriteFile(pTSBuf->pFile, &pBlock->tag.nLen, sizeof(pBlock->tag.nLen));
    metaLen += (int32_t)taosWriteFile(pTSBuf->pFile, &pBlock->tag.i, (size_t) pBlock->tag.nLen);
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  } else {
    trueLen = 0;
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    metaLen += (int32_t)taosWriteFile(pTSBuf->pFile, &trueLen, sizeof(pBlock->tag.nLen));
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  }

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  taosWriteFile(pTSBuf->pFile, &pBlock->numOfElem, sizeof(pBlock->numOfElem));
  taosWriteFile(pTSBuf->pFile, &pBlock->compLen, sizeof(pBlock->compLen));
  taosWriteFile(pTSBuf->pFile, pBlock->payload, (size_t)pBlock->compLen);
  taosWriteFile(pTSBuf->pFile, &pBlock->compLen, sizeof(pBlock->compLen));
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  metaLen += (int32_t) taosWriteFile(pTSBuf->pFile, &trueLen, sizeof(pBlock->tag.nLen));
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  assert(metaLen == getTagAreaLength(&pBlock->tag));

  int32_t blockSize = metaLen + sizeof(pBlock->numOfElem) + sizeof(pBlock->compLen) * 2 + pBlock->compLen;
  pTSBuf->fileSize += blockSize;
  
  pTSBuf->tsData.len = 0;
  
  STSGroupBlockInfoEx* pGroupBlockInfoEx = tsBufGetLastGroupInfo(pTSBuf);
  
  pGroupBlockInfoEx->info.compLen += blockSize;
  pGroupBlockInfoEx->info.numOfBlocks += 1;
  
  shrinkBuffer(&pTSBuf->tsData);
}

static void expandBuffer(STSList* ptsData, int32_t inputSize) {
  if (ptsData->allocSize - ptsData->len < inputSize) {
    int32_t newSize = inputSize + ptsData->len;
    char*   tmp = realloc(ptsData->rawBuf, (size_t)newSize);
    if (tmp == NULL) {
      // todo
    }
    
    ptsData->rawBuf = tmp;
    ptsData->allocSize = newSize;
  }
}

STSBlock* readDataFromDisk(STSBuf* pTSBuf, int32_t order, bool decomp) {
  STSBlock* pBlock = &pTSBuf->block;

  // clear the memory buffer
  pBlock->compLen   = 0;
  pBlock->padding   = 0;
  pBlock->numOfElem = 0;

  int32_t offset = -1;

  if (order == TSDB_ORDER_DESC) {
    /*
     * set the right position for the reversed traverse, the reversed traverse is started from
     * the end of each comp data block
     */
    int32_t prev = -(int32_t) (sizeof(pBlock->padding) + sizeof(pBlock->tag.nLen));
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    int32_t ret = taosLSeekFile(pTSBuf->pFile, prev, SEEK_CUR);
    size_t sz = taosReadFile(pTSBuf->pFile, &pBlock->padding, sizeof(pBlock->padding));
    sz = taosReadFile(pTSBuf->pFile, &pBlock->tag.nLen, sizeof(pBlock->tag.nLen));
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    UNUSED(sz); 

    pBlock->compLen = pBlock->padding;

    offset = pBlock->compLen + sizeof(pBlock->compLen) * 2 + sizeof(pBlock->numOfElem) + getTagAreaLength(&pBlock->tag);
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    ret = taosLSeekFile(pTSBuf->pFile, -offset, SEEK_CUR);
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    UNUSED(ret);
  }

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  int32_t ret = taosReadFile(pTSBuf->pFile, &pBlock->tag.nType, sizeof(pBlock->tag.nType));
  ret = taosReadFile(pTSBuf->pFile, &pBlock->tag.nLen, sizeof(pBlock->tag.nLen));
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  // NOTE: mix types tags are not supported
  size_t sz = 0;
  if (pBlock->tag.nType == TSDB_DATA_TYPE_BINARY || pBlock->tag.nType == TSDB_DATA_TYPE_NCHAR) {
    char* tp = realloc(pBlock->tag.pz, pBlock->tag.nLen + 1);
    assert(tp != NULL);

    memset(tp, 0, pBlock->tag.nLen + 1);
    pBlock->tag.pz = tp;

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    sz = taosReadFile(pTSBuf->pFile, pBlock->tag.pz, (size_t)pBlock->tag.nLen);
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    UNUSED(sz);
  } else if (pBlock->tag.nType == TSDB_DATA_TYPE_FLOAT) {
    float tfloat = 0;
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    sz = taosReadFile(pTSBuf->pFile, &tfloat, (size_t) pBlock->tag.nLen);
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    pBlock->tag.d = (double)tfloat;
    UNUSED(sz);
  } else if (pBlock->tag.nType != TSDB_DATA_TYPE_NULL) { //TODO check the return value
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    sz = taosReadFile(pTSBuf->pFile, &pBlock->tag.i, (size_t) pBlock->tag.nLen);
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    UNUSED(sz);
  }

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  sz = taosReadFile(pTSBuf->pFile, &pBlock->numOfElem, sizeof(pBlock->numOfElem));
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  UNUSED(sz);
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  sz = taosReadFile(pTSBuf->pFile, &pBlock->compLen, sizeof(pBlock->compLen));
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  UNUSED(sz);
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  sz = taosReadFile(pTSBuf->pFile, pBlock->payload, (size_t)pBlock->compLen);
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  if (decomp) {
    pTSBuf->tsData.len =
        tsDecompressTimestamp(pBlock->payload, pBlock->compLen, pBlock->numOfElem, pTSBuf->tsData.rawBuf,
                              pTSBuf->tsData.allocSize, TWO_STAGE_COMP, pTSBuf->assistBuf, pTSBuf->bufSize);
  }
  
  // read the comp length at the length of comp block
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  sz = taosReadFile(pTSBuf->pFile, &pBlock->padding, sizeof(pBlock->padding));
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  assert(pBlock->padding == pBlock->compLen);

  int32_t n = 0;
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  sz = taosReadFile(pTSBuf->pFile, &n, sizeof(pBlock->tag.nLen));
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  if (pBlock->tag.nType == TSDB_DATA_TYPE_NULL) {
    assert(n == 0);
  } else {
    assert(n == pBlock->tag.nLen);
  }

  UNUSED(sz);
  
  // for backwards traverse, set the start position at the end of previous block
  if (order == TSDB_ORDER_DESC) {
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    int32_t r = taosLSeekFile(pTSBuf->pFile, -offset, SEEK_CUR);
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    UNUSED(r);
  }
  
  return pBlock;
}

// set the order of ts buffer if the ts order has not been set yet
static int32_t setCheckTSOrder(STSBuf* pTSBuf, const char* pData, int32_t len) {
  STSList* ptsData = &pTSBuf->tsData;
  
  if (pTSBuf->tsOrder == -1) {
    if (ptsData->len > 0) {
      TSKEY lastKey = *(TSKEY*)(ptsData->rawBuf + ptsData->len - TSDB_KEYSIZE);
      
      if (lastKey > *(TSKEY*)pData) {
        pTSBuf->tsOrder = TSDB_ORDER_DESC;
      } else {
        pTSBuf->tsOrder = TSDB_ORDER_ASC;
      }
    } else if (len > TSDB_KEYSIZE) {
      // no data in current vnode, more than one ts is added, check the orders
      TSKEY k1 = *(TSKEY*)(pData);
      TSKEY k2 = *(TSKEY*)(pData + TSDB_KEYSIZE);
      
      if (k1 < k2) {
        pTSBuf->tsOrder = TSDB_ORDER_ASC;
      } else if (k1 > k2) {
        pTSBuf->tsOrder = TSDB_ORDER_DESC;
      } else {
        // todo handle error
      }
    }
  } else {
    // todo the timestamp order is set, check the asc/desc order of appended data
  }
  
  return TSDB_CODE_SUCCESS;
}

void tsBufAppend(STSBuf* pTSBuf, int32_t id, SVariant* tag, const char* pData, int32_t len) {
  STSGroupBlockInfoEx* pBlockInfo = NULL;
  STSList*             ptsData = &pTSBuf->tsData;
  
  if (pTSBuf->numOfGroups == 0 || tsBufGetLastGroupInfo(pTSBuf)->info.id != id) {
    writeDataToDisk(pTSBuf);
    shrinkBuffer(ptsData);
    
    pBlockInfo = addOneGroupInfo(pTSBuf, id);
  } else {
    pBlockInfo = tsBufGetLastGroupInfo(pTSBuf);
  }
  
  assert(pBlockInfo->info.id == id);

  if ((taosVariantCompare(&pTSBuf->block.tag, tag) != 0) && ptsData->len > 0) {
    // new arrived data with different tags value, save current value into disk first
    writeDataToDisk(pTSBuf);
  } else {
    expandBuffer(ptsData, len);
  }

  taosVariantAssign(&pTSBuf->block.tag, tag);
  memcpy(ptsData->rawBuf + ptsData->len, pData, (size_t)len);
  
  // todo check return value
  setCheckTSOrder(pTSBuf, pData, len);
  
  ptsData->len += len;
  pBlockInfo->len += len;
  
  pTSBuf->numOfTotal += len / TSDB_KEYSIZE;
  
  // the size of raw data exceeds the size of the default prepared buffer, so
  // during getBufBlock, the output buffer needs to be large enough.
  if (ptsData->len >= ptsData->threshold) {
    writeDataToDisk(pTSBuf);
    shrinkBuffer(ptsData);
  }
  
  tsBufResetPos(pTSBuf);
}

void tsBufFlush(STSBuf* pTSBuf) {
  if (pTSBuf->tsData.len <= 0) {
    return;
  }
  
  writeDataToDisk(pTSBuf);
  shrinkBuffer(&pTSBuf->tsData);
  
  STSGroupBlockInfoEx* pBlockInfoEx = tsBufGetLastGroupInfo(pTSBuf);
  
  // update prev vnode length info in file
  TSBufUpdateGroupInfo(pTSBuf, pTSBuf->numOfGroups - 1, &pBlockInfoEx->info);
  
  // save the ts order into header
  STSBufFileHeader header = {
      .magic = TS_COMP_FILE_MAGIC, .numOfGroup = pTSBuf->numOfGroups, .tsOrder = pTSBuf->tsOrder};
  STSBufUpdateHeader(pTSBuf, &header);
}

static int32_t tsBufFindGroupById(STSGroupBlockInfoEx* pGroupInfoEx, int32_t numOfGroups, int32_t id) {
  int32_t j = -1;
  for (int32_t i = 0; i < numOfGroups; ++i) {
    if (pGroupInfoEx[i].info.id == id) {
      j = i;
      break;
    }
  }
  
  return j;
}

// todo opt performance by cache blocks info
static int32_t tsBufFindBlock(STSBuf* pTSBuf, STSGroupBlockInfo* pBlockInfo, int32_t blockIndex) {
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  if (taosLSeekFile(pTSBuf->pFile, pBlockInfo->offset, SEEK_SET) != 0) {
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    return -1;
  }
  
  // sequentially read the compressed data blocks, start from the beginning of the comp data block of this vnode
  int32_t i = 0;
  bool    decomp = false;
  
  while ((i++) <= blockIndex) {
    if (readDataFromDisk(pTSBuf, TSDB_ORDER_ASC, decomp) == NULL) {
      return -1;
    }
  }
  
  // set the file position to be the end of previous comp block
  if (pTSBuf->cur.order == TSDB_ORDER_DESC) {
    STSBlock* pBlock = &pTSBuf->block;
    int32_t   compBlockSize =
        pBlock->compLen + sizeof(pBlock->compLen) * 2 + sizeof(pBlock->numOfElem) + getTagAreaLength(&pBlock->tag);
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    int32_t ret = taosLSeekFile(pTSBuf->pFile, -compBlockSize, SEEK_CUR);
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    UNUSED(ret);
  }
  
  return 0;
}

static int32_t tsBufFindBlockByTag(STSBuf* pTSBuf, STSGroupBlockInfo* pBlockInfo, SVariant* tag) {
  bool decomp = false;
  
  int64_t offset = 0;
  if (pTSBuf->cur.order == TSDB_ORDER_ASC) {
    offset = pBlockInfo->offset;
  } else {  // reversed traverse starts from the end of block
    offset = pBlockInfo->offset + pBlockInfo->compLen;
  }
  
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  if (taosLSeekFile(pTSBuf->pFile, (int32_t)offset, SEEK_SET) != 0) {
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    return -1;
  }
  
  for (int32_t i = 0; i < pBlockInfo->numOfBlocks; ++i) {
    if (readDataFromDisk(pTSBuf, pTSBuf->cur.order, decomp) == NULL) {
      return -1;
    }
    
    if (taosVariantCompare(&pTSBuf->block.tag, tag) == 0) {
      return (pTSBuf->cur.order == TSDB_ORDER_ASC)? i: (pBlockInfo->numOfBlocks - (i + 1));
    }
  }
  
  return -1;
}

static void tsBufGetBlock(STSBuf* pTSBuf, int32_t groupIndex, int32_t blockIndex) {
  STSGroupBlockInfo* pBlockInfo = &pTSBuf->pData[groupIndex].info;
  if (pBlockInfo->numOfBlocks <= blockIndex) {
    assert(false);
  }
  
  STSCursor* pCur = &pTSBuf->cur;
  if (pCur->vgroupIndex == groupIndex && ((pCur->blockIndex <= blockIndex && pCur->order == TSDB_ORDER_ASC) ||
      (pCur->blockIndex >= blockIndex && pCur->order == TSDB_ORDER_DESC))) {
    int32_t i = 0;
    bool    decomp = false;
    int32_t step = abs(blockIndex - pCur->blockIndex);
    
    while ((++i) <= step) {
      if (readDataFromDisk(pTSBuf, pCur->order, decomp) == NULL) {
        return;
      }
    }
  } else {
    if (tsBufFindBlock(pTSBuf, pBlockInfo, blockIndex) == -1) {
      assert(false);
    }
  }
  
  STSBlock* pBlock = &pTSBuf->block;
  
  size_t s = pBlock->numOfElem * TSDB_KEYSIZE;
  
  /*
   * In order to accommodate all the qualified data, the actual buffer size for one block with identical tags value
   * may exceed the maximum allowed size during *tsBufAppend* function by invoking expandBuffer function
   */
  if (s > pTSBuf->tsData.allocSize) {
    expandBuffer(&pTSBuf->tsData, (int32_t)s);
  }
  
  pTSBuf->tsData.len =
      tsDecompressTimestamp(pBlock->payload, pBlock->compLen, pBlock->numOfElem, pTSBuf->tsData.rawBuf,
                            pTSBuf->tsData.allocSize, TWO_STAGE_COMP, pTSBuf->assistBuf, pTSBuf->bufSize);
  
  assert((pTSBuf->tsData.len / TSDB_KEYSIZE == pBlock->numOfElem) && (pTSBuf->tsData.allocSize >= pTSBuf->tsData.len));
  
  pCur->vgroupIndex = groupIndex;
  pCur->blockIndex = blockIndex;
  
  pCur->tsIndex = (pCur->order == TSDB_ORDER_ASC) ? 0 : pBlock->numOfElem - 1;
}

static int32_t doUpdateGroupInfo(STSBuf* pTSBuf, int64_t offset, STSGroupBlockInfo* pVInfo) {
  if (offset < 0 || offset >= getDataStartOffset()) {
    return -1;
  }

623
  if (taosLSeekFile(pTSBuf->pFile, (int32_t)offset, SEEK_SET) != 0) {
624 625 626
    return -1;
  }

627
  taosWriteFile(pTSBuf->pFile, pVInfo, sizeof(STSGroupBlockInfo));
628 629 630 631 632 633 634 635 636 637 638 639 640
  return 0;
}

STSGroupBlockInfo* tsBufGetGroupBlockInfo(STSBuf* pTSBuf, int32_t id) {
  int32_t j = tsBufFindGroupById(pTSBuf->pData, pTSBuf->numOfGroups, id);
  if (j == -1) {
    return NULL;
  }
  
  return &pTSBuf->pData[j].info;
}

int32_t STSBufUpdateHeader(STSBuf* pTSBuf, STSBufFileHeader* pHeader) {
641
  if ((pTSBuf->pFile == NULL) || pHeader == NULL || pHeader->numOfGroup == 0 || pHeader->magic != TS_COMP_FILE_MAGIC) {
642 643 644 645 646
    return -1;
  }

  assert(pHeader->tsOrder == TSDB_ORDER_ASC || pHeader->tsOrder == TSDB_ORDER_DESC);

647
  int32_t r = taosLSeekFile(pTSBuf->pFile, 0, SEEK_SET);
648 649 650 651 652
  if (r != 0) {
//    qError("fseek failed, errno:%d", errno);
    return -1;
  }

653
  size_t ws = taosWriteFile(pTSBuf->pFile, pHeader, sizeof(STSBufFileHeader));
654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827
  if (ws != 1) {    
//    qError("ts update header fwrite failed, size:%d, expected size:%d", (int32_t)ws, (int32_t)sizeof(STSBufFileHeader));
    return -1;
  }
  return 0;
}

bool tsBufNextPos(STSBuf* pTSBuf) {
  if (pTSBuf == NULL || pTSBuf->numOfGroups == 0) {
    return false;
  }
  
  STSCursor* pCur = &pTSBuf->cur;
  
  // get the first/last position according to traverse order
  if (pCur->vgroupIndex == -1) {
    if (pCur->order == TSDB_ORDER_ASC) {
      tsBufGetBlock(pTSBuf, 0, 0);
      
      if (pTSBuf->block.numOfElem == 0) {  // the whole list is empty, return
        tsBufResetPos(pTSBuf);
        return false;
      } else {
        return true;
      }
      
    } else {  // get the last timestamp record in the last block of the last vnode
      assert(pTSBuf->numOfGroups > 0);
      
      int32_t groupIndex = pTSBuf->numOfGroups - 1;
      pCur->vgroupIndex = groupIndex;
      
      int32_t            id = pTSBuf->pData[pCur->vgroupIndex].info.id;
      STSGroupBlockInfo* pBlockInfo = tsBufGetGroupBlockInfo(pTSBuf, id);
      int32_t            blockIndex = pBlockInfo->numOfBlocks - 1;
      
      tsBufGetBlock(pTSBuf, groupIndex, blockIndex);
      
      pCur->tsIndex = pTSBuf->block.numOfElem - 1;
      if (pTSBuf->block.numOfElem == 0) {
        tsBufResetPos(pTSBuf);
        return false;
      } else {
        return true;
      }
    }
  }
  
  int32_t step = pCur->order == TSDB_ORDER_ASC ? 1 : -1;
  
  while (1) {
    assert(pTSBuf->tsData.len == pTSBuf->block.numOfElem * TSDB_KEYSIZE);
    
    if ((pCur->order == TSDB_ORDER_ASC && pCur->tsIndex >= pTSBuf->block.numOfElem - 1) ||
        (pCur->order == TSDB_ORDER_DESC && pCur->tsIndex <= 0)) {
      int32_t id = pTSBuf->pData[pCur->vgroupIndex].info.id;
      
      STSGroupBlockInfo* pBlockInfo = tsBufGetGroupBlockInfo(pTSBuf, id);
      if (pBlockInfo == NULL || (pCur->blockIndex >= pBlockInfo->numOfBlocks - 1 && pCur->order == TSDB_ORDER_ASC) ||
          (pCur->blockIndex <= 0 && pCur->order == TSDB_ORDER_DESC)) {
        if ((pCur->vgroupIndex >= pTSBuf->numOfGroups - 1 && pCur->order == TSDB_ORDER_ASC) ||
            (pCur->vgroupIndex <= 0 && pCur->order == TSDB_ORDER_DESC)) {
          pCur->vgroupIndex = -1;
          return false;
        }
        
        if (pBlockInfo == NULL) {
          return false;
        }
        
        int32_t blockIndex = (pCur->order == TSDB_ORDER_ASC) ? 0 : (pBlockInfo->numOfBlocks - 1);
        tsBufGetBlock(pTSBuf, pCur->vgroupIndex + step, blockIndex);
        break;
        
      } else {
        tsBufGetBlock(pTSBuf, pCur->vgroupIndex, pCur->blockIndex + step);
        break;
      }
    } else {
      pCur->tsIndex += step;
      break;
    }
  }
  
  return true;
}

void tsBufResetPos(STSBuf* pTSBuf) {
  if (pTSBuf == NULL) {
    return;
  }
  
  pTSBuf->cur = (STSCursor){.tsIndex = -1, .blockIndex = -1, .vgroupIndex = -1, .order = pTSBuf->cur.order};
}

STSElem tsBufGetElem(STSBuf* pTSBuf) {
  STSElem elem1 = {.id = -1};
  if (pTSBuf == NULL) {
    return elem1;
  }
  
  STSCursor* pCur = &pTSBuf->cur;
  if (pCur != NULL && pCur->vgroupIndex < 0) {
    return elem1;
  }

  STSBlock* pBlock = &pTSBuf->block;
  
  elem1.id = pTSBuf->pData[pCur->vgroupIndex].info.id;
  elem1.ts = *(TSKEY*)(pTSBuf->tsData.rawBuf + pCur->tsIndex * TSDB_KEYSIZE);
  elem1.tag = &pBlock->tag;

  return elem1;
}

/**
 * current only support ts comp data from two vnode merge
 * @param pDestBuf
 * @param pSrcBuf
 * @param id
 * @return
 */
int32_t tsBufMerge(STSBuf* pDestBuf, const STSBuf* pSrcBuf) {
  if (pDestBuf == NULL || pSrcBuf == NULL || pSrcBuf->numOfGroups <= 0) {
    return 0;
  }
  
  if (pDestBuf->numOfGroups + pSrcBuf->numOfGroups > TS_COMP_FILE_GROUP_MAX) {
    return -1;
  }
  
  // src can only have one vnode index
  assert(pSrcBuf->numOfGroups == 1);

  // there are data in buffer, flush to disk first
  tsBufFlush(pDestBuf);
  
  // compared with the last vnode id
  int32_t id = tsBufGetLastGroupInfo((STSBuf*) pSrcBuf)->info.id;
  if (id != tsBufGetLastGroupInfo(pDestBuf)->info.id) {
    int32_t oldSize = pDestBuf->numOfGroups;
    int32_t newSize = oldSize + pSrcBuf->numOfGroups;
    
    if (pDestBuf->numOfAlloc < newSize) {
      pDestBuf->numOfAlloc = newSize;
      
      STSGroupBlockInfoEx* tmp = realloc(pDestBuf->pData, sizeof(STSGroupBlockInfoEx) * newSize);
      if (tmp == NULL) {
        return -1;
      }
      
      pDestBuf->pData = tmp;
    }
    
    // directly copy the vnode index information
    memcpy(&pDestBuf->pData[oldSize], pSrcBuf->pData, (size_t)pSrcBuf->numOfGroups * sizeof(STSGroupBlockInfoEx));
    
    // set the new offset value
    for (int32_t i = 0; i < pSrcBuf->numOfGroups; ++i) {
      STSGroupBlockInfoEx* pBlockInfoEx = &pDestBuf->pData[i + oldSize];
      pBlockInfoEx->info.offset = (pSrcBuf->pData[i].info.offset - getDataStartOffset()) + pDestBuf->fileSize;
      pBlockInfoEx->info.id = id;
    }
    
    pDestBuf->numOfGroups = newSize;
  } else {
    STSGroupBlockInfoEx* pBlockInfoEx = tsBufGetLastGroupInfo(pDestBuf);
    
    pBlockInfoEx->len += pSrcBuf->pData[0].len;
    pBlockInfoEx->info.numOfBlocks += pSrcBuf->pData[0].info.numOfBlocks;
    pBlockInfoEx->info.compLen += pSrcBuf->pData[0].info.compLen;
    pBlockInfoEx->info.id = id;
  }
  
828
  int32_t r = taosLSeekFile(pDestBuf->pFile, 0, SEEK_END);
829 830 831 832
  assert(r == 0);
  
  int64_t offset = getDataStartOffset();
  int32_t size = (int32_t)pSrcBuf->fileSize - (int32_t)offset;
833
  int64_t written = taosFSendFile(pDestBuf->pFile, pSrcBuf->pFile, &offset, size);
834 835 836 837 838 839 840 841 842 843
  
  if (written == -1 || written != size) {
    return -1;
  }
  
  pDestBuf->numOfTotal += pSrcBuf->numOfTotal;

  int32_t oldSize = pDestBuf->fileSize;

  // file meta data may be cached, close and reopen the file for accurate file size.
844 845 846 847
  taosCloseFile(&pDestBuf->pFile);
  // pDestBuf->pFile = fopen(pDestBuf->path, "rb+");
  pDestBuf->pFile = taosOpenFile(pDestBuf->path, TD_FILE_WRITE | TD_FILE_READ);
  if (pDestBuf->pFile == NULL) {
848 849 850
    return -1;
  }

851 852
  int64_t file_size;
  if (taosFStatFile(pDestBuf->pFile, &file_size, NULL) != 0) {
853 854
    return -1;  
  }
855
  pDestBuf->fileSize = (uint32_t)file_size;
856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873

  assert(pDestBuf->fileSize == oldSize + size);

  return 0;
}

STSBuf* tsBufCreateFromCompBlocks(const char* pData, int32_t numOfBlocks, int32_t len, int32_t order, int32_t id) {
  STSBuf* pTSBuf = tsBufCreate(true, order);
  
  STSGroupBlockInfo* pBlockInfo = &(addOneGroupInfo(pTSBuf, 0)->info);
  pBlockInfo->numOfBlocks = numOfBlocks;
  pBlockInfo->compLen = len;
  pBlockInfo->offset = getDataStartOffset();
  pBlockInfo->id = id;
  
  // update prev vnode length info in file
  TSBufUpdateGroupInfo(pTSBuf, pTSBuf->numOfGroups - 1, pBlockInfo);
  
874
  int32_t ret = taosLSeekFile(pTSBuf->pFile, pBlockInfo->offset, SEEK_SET);
875 876 877 878 879
  if (ret == -1) {
//    qError("fseek failed, errno:%d", errno);
    tsBufDestroy(pTSBuf);
    return NULL;
  }
880
  size_t sz = taosWriteFile(pTSBuf->pFile, (void*)pData, len);
881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898
  if (sz != len) {
//    qError("ts data fwrite failed, write size:%d, expected size:%d", (int32_t)sz, len);
    tsBufDestroy(pTSBuf);
    return NULL;
  }
  pTSBuf->fileSize += len;
  
  pTSBuf->tsOrder = order;
  assert(order == TSDB_ORDER_ASC || order == TSDB_ORDER_DESC);
  
  STSBufFileHeader header = {
      .magic = TS_COMP_FILE_MAGIC, .numOfGroup = pTSBuf->numOfGroups, .tsOrder = pTSBuf->tsOrder};
  if (STSBufUpdateHeader(pTSBuf, &header) < 0) {
    tsBufDestroy(pTSBuf);
    return NULL;
  }

  // TODO taosFsync??
899
//  if (taosFsync(fileno(pTSBuf->pFile)) == -1) {
900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989
////    qError("fsync failed, errno:%d", errno);
//    tsBufDestroy(pTSBuf);
//    return NULL;
//  }
  
  return pTSBuf;
}

STSElem tsBufGetElemStartPos(STSBuf* pTSBuf, int32_t id, SVariant* tag) {
  STSElem elem = {.id = -1};
  
  if (pTSBuf == NULL) {
    return elem;
  }
  
  int32_t j = tsBufFindGroupById(pTSBuf->pData, pTSBuf->numOfGroups, id);
  if (j == -1) {
    return elem;
  }
  
  // for debug purpose
  //  tsBufDisplay(pTSBuf);
  
  STSCursor*         pCur = &pTSBuf->cur;
  STSGroupBlockInfo* pBlockInfo = &pTSBuf->pData[j].info;
  
  int32_t blockIndex = tsBufFindBlockByTag(pTSBuf, pBlockInfo, tag);
  if (blockIndex < 0) {
    return elem;
  }
  
  pCur->vgroupIndex = j;
  pCur->blockIndex = blockIndex;
  tsBufGetBlock(pTSBuf, j, blockIndex);
  
  return tsBufGetElem(pTSBuf);
}

STSCursor tsBufGetCursor(STSBuf* pTSBuf) {
  STSCursor c = {.vgroupIndex = -1};
  if (pTSBuf == NULL) {
    return c;
  }
  
  return pTSBuf->cur;
}

void tsBufSetCursor(STSBuf* pTSBuf, STSCursor* pCur) {
  if (pTSBuf == NULL || pCur == NULL) {
    return;
  }
  
  //  assert(pCur->vgroupIndex != -1 && pCur->tsIndex >= 0 && pCur->blockIndex >= 0);
  if (pCur->vgroupIndex != -1) {
    tsBufGetBlock(pTSBuf, pCur->vgroupIndex, pCur->blockIndex);
  }
  
  pTSBuf->cur = *pCur;
}

void tsBufSetTraverseOrder(STSBuf* pTSBuf, int32_t order) {
  if (pTSBuf == NULL) {
    return;
  }
  
  pTSBuf->cur.order = order;
}

STSBuf* tsBufClone(STSBuf* pTSBuf) {
  if (pTSBuf == NULL) {
    return NULL;
  }

  tsBufFlush(pTSBuf);

  return tsBufCreateFromFile(pTSBuf->path, false);
}

void tsBufDisplay(STSBuf* pTSBuf) {
  printf("-------start of ts comp file-------\n");
  printf("number of vnode:%d\n", pTSBuf->numOfGroups);
  
  int32_t old = pTSBuf->cur.order;
  pTSBuf->cur.order = TSDB_ORDER_ASC;
  
  tsBufResetPos(pTSBuf);
  
  while (tsBufNextPos(pTSBuf)) {
    STSElem elem = tsBufGetElem(pTSBuf);
    if (elem.tag->nType == TSDB_DATA_TYPE_BIGINT) {
990
      printf("%d-%" PRId64 "-%" PRId64 "\n", elem.id, elem.tag->i, elem.ts);
991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076
    }
  }
  
  pTSBuf->cur.order = old;
  printf("-------end of ts comp file-------\n");
}

static int32_t getDataStartOffset() {
  return sizeof(STSBufFileHeader) + TS_COMP_FILE_GROUP_MAX * sizeof(STSGroupBlockInfo);
}

// update prev vnode length info in file
static void TSBufUpdateGroupInfo(STSBuf* pTSBuf, int32_t index, STSGroupBlockInfo* pBlockInfo) {
  int32_t offset = sizeof(STSBufFileHeader) + index * sizeof(STSGroupBlockInfo);
  doUpdateGroupInfo(pTSBuf, offset, pBlockInfo);
}

static STSBuf* allocResForTSBuf(STSBuf* pTSBuf) {
  const int32_t INITIAL_GROUPINFO_SIZE = 4;
  
  pTSBuf->numOfAlloc = INITIAL_GROUPINFO_SIZE;
  pTSBuf->pData = calloc(pTSBuf->numOfAlloc, sizeof(STSGroupBlockInfoEx));
  if (pTSBuf->pData == NULL) {
    tsBufDestroy(pTSBuf);
    return NULL;
  }
  
  pTSBuf->tsData.rawBuf = malloc(MEM_BUF_SIZE);
  if (pTSBuf->tsData.rawBuf == NULL) {
    tsBufDestroy(pTSBuf);
    return NULL;
  }
  
  pTSBuf->bufSize = MEM_BUF_SIZE;
  pTSBuf->tsData.threshold = MEM_BUF_SIZE;
  pTSBuf->tsData.allocSize = MEM_BUF_SIZE;
  
  pTSBuf->assistBuf = malloc(MEM_BUF_SIZE);
  if (pTSBuf->assistBuf == NULL) {
    tsBufDestroy(pTSBuf);
    return NULL;
  }
  
  pTSBuf->block.payload = malloc(MEM_BUF_SIZE);
  if (pTSBuf->block.payload == NULL) {
    tsBufDestroy(pTSBuf);
    return NULL;
  }
  
  pTSBuf->fileSize += getDataStartOffset();
  return pTSBuf;
}

int32_t tsBufGetNumOfGroup(STSBuf* pTSBuf) {
  if (pTSBuf == NULL) {
    return 0;
  }

  return pTSBuf->numOfGroups;
}

void tsBufGetGroupIdList(STSBuf* pTSBuf, int32_t* num, int32_t** id) {
  int32_t size = tsBufGetNumOfGroup(pTSBuf);
  if (num != NULL) {
    *num = size;
  }

  *id = NULL;
  if (size == 0) {
    return;
  }

  (*id) = malloc(tsBufGetNumOfGroup(pTSBuf) * sizeof(int32_t));

  for(int32_t i = 0; i < size; ++i) {
    (*id)[i] = pTSBuf->pData[i].info.id;
  }
}

int32_t dumpFileBlockByGroupId(STSBuf* pTSBuf, int32_t groupIndex, void* buf, int32_t* len, int32_t* numOfBlocks) {
  assert(groupIndex >= 0 && groupIndex < pTSBuf->numOfGroups);
  STSGroupBlockInfo *pBlockInfo = &pTSBuf->pData[groupIndex].info;

  *len = 0;
  *numOfBlocks = 0;

1077 1078
  if (taosLSeekFile(pTSBuf->pFile, pBlockInfo->offset, SEEK_SET) != 0) {
    int code = TAOS_SYSTEM_ERROR(taosEOFFile(pTSBuf->pFile));
1079 1080 1081 1082
//    qError("%p: fseek failed: %s", pSql, tstrerror(code));
    return code;
  }

1083
  size_t s = taosReadFile(pTSBuf->pFile, buf, pBlockInfo->compLen);
1084
  if (s != pBlockInfo->compLen) {
1085
    int code = TAOS_SYSTEM_ERROR(taosEOFFile(pTSBuf->pFile));
1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111
//    tscError("%p: fread didn't return expected data: %s", pSql, tstrerror(code));
    return code;
  }

  *len = pBlockInfo->compLen;
  *numOfBlocks = pBlockInfo->numOfBlocks;

  return TSDB_CODE_SUCCESS;
}

STSElem tsBufFindElemStartPosByTag(STSBuf* pTSBuf, SVariant* pTag) {
  STSElem el = {.id = -1};

  for (int32_t i = 0; i < pTSBuf->numOfGroups; ++i) {
    el = tsBufGetElemStartPos(pTSBuf, pTSBuf->pData[i].info.id, pTag);
    if (el.id == pTSBuf->pData[i].info.id) {
      return el;
    }
  }

  return el;
}

bool tsBufIsValidElem(STSElem* pElem) {
  return pElem->id >= 0;
}