add checkpoint

include/libs/stream/streamSnapshot.h

@@ -19,15 +19,16 @@
 typedef struct SStreamSnapReader SStreamSnapReader;
 typedef struct StreamSnapWriter  StreamSnapWriter;
 
-typedef struct SStreamSnapHandle SStreamSnapHandle;
+typedef struct SStreamSnapHandle   SStreamSnapHandle;
+typedef struct SStreamSnapBlockHdr SStreamSnapBlockHdr;
 
-int32_t streamSnapReaderOpen(void* pMeta, int64_t sver, int64_t ever, void** ppReader);
-int32_t streamSnapReaderClose(void** ppReader);
-int32_t streamSnapRead(void* pReader, uint8_t** ppData);
+int32_t streamSnapReaderOpen(void* pMeta, int64_t sver, int64_t ever, SStreamSnapReader** ppReader);
+int32_t streamSnapReaderClose(SStreamSnapReader* pReader);
+int32_t streamSnapRead(SStreamSnapReader* pReader, uint8_t** ppData, int64_t* size);
 
 // SMetaSnapWriter ========================================
-int32_t streamSnapWriterOpen(void* pMeta, int64_t sver, int64_t ever, void** ppWriter);
-int32_t streamSnapWrite(void* pWriter, uint8_t* pData, uint32_t nData);
-int32_t streamSnapWriterClose(void** ppWriter, int8_t rollback);
+int32_t streamSnapWriterOpen(void* pMeta, int64_t sver, int64_t ever, StreamSnapWriter** ppWriter);
+int32_t streamSnapWrite(StreamSnapWriter* pWriter, uint8_t* pData, uint32_t nData);
+int32_t streamSnapWriterClose(StreamSnapWriter** ppWriter, int8_t rollback);
 
 #endif
\ No newline at end of file

source/libs/stream/src/streamSnapshot.c

@@ -17,42 +17,69 @@
 #include "rocksdb/c.h"
 #include "tcommon.h"
 
+enum SBackendFileType {
+  ROCKSDB_OPTIONS_TYPE = 1,
+  ROCKSDB_MAINFEST_TYPE = 2,
+  ROCKSDB_SST_TYPE = 3,
+  ROCKSDB_CURRENT_TYPE = 4,
+  ROCKSDB_CHECKPOINT_META_TYPE = 5,
+};
+
+typedef struct SBackendFileItem {
+  char*  name;
+  int8_t type;
+} SBackendFileItem;
 typedef struct SBackendFile {
-  SArray* pSst;
   char*   pCurrent;
   char*   pMainfest;
   char*   pOptions;
+  SArray* pSst;
   char*   pCheckpointMeta;
+  char*   path;
 } SBanckendFile;
 struct SStreamSnapHandle {
   void*          handle;
-  SArray*        fileList;
   SBanckendFile* pBackendFile;
+  int64_t        checkpointId;
+  int64_t        seraial;
+  int64_t        offset;
+  TdFilePtr      fd;
+  int8_t         filetype;
+  SArray*        pFileList;
+  int32_t        currFileIdx;
+};
+struct SStreamSnapBlockHdr {
+  int8_t  type;
+  int8_t  flag;
+  int64_t index;
+  char    name[128];
+  int64_t size;
+  uint8_t data[];
 };
-
 struct SStreamSnapReader {
-  void*   pMeta;
-  int64_t sver;
-  int64_t ever;
+  void*             pMeta;
+  int64_t           sver;
+  int64_t           ever;
+  SStreamSnapHandle handle;
 };
-
-// SMetaSnapWriter ========================================
 struct StreamSnapWriter {
   void*   pMeta;
   int64_t sver;
   int64_t ever;
 };
+const char*    ROCKSDB_OPTIONS = "OPTIONS";
+const char*    ROCKSDB_MAINFEST = "MANIFEST";
+const char*    ROCKSDB_SST = "sst";
+const char*    ROCKSDB_CURRENT = "CURRENT";
+const char*    ROCKSDB_CHECKPOINT_META = "CHECKPOINT";
+static int64_t kBlockSize = 64 * 1024;
 
-const char* ROCKSDB_OPTIONS = "OPTIONS";
-const char* ROCKSDB_MAINFEST = "MANIFEST";
-const char* ROCKSDB_SST = "sst";
-const char* ROCKSDB_CURRENT = "CURRENT";
-const char* ROCKSDB_CHECKPOINT_META = "CHECKPOINT";
+int32_t streamSnapHandleInit(SStreamSnapHandle* handle, char* path);
+void    streamSnapHandleDestroy(SStreamSnapHandle* handle);
 
 int32_t streamSnapHandleInit(SStreamSnapHandle* handle, char* path) {
   // impl later
   int32_t code = 0;
-  handle->fileList = taosArrayInit(32, sizeof(void*));
 
   TdDirPtr pDir = taosOpenDir(path);
   if (NULL == pDir) {
@@ -60,6 +87,9 @@ int32_t streamSnapHandleInit(SStreamSnapHandle* handle, char* path) {
   }
 
   SBanckendFile* pFile = taosMemoryCalloc(1, sizeof(SBanckendFile));
+  handle->checkpointId = 0;
+  handle->seraial = 0;
+  pFile->path = taosStrdup(path);
   pFile->pSst = taosArrayInit(16, sizeof(void*));
 
   TdDirEntryPtr pDirEntry;
@@ -90,8 +120,47 @@ int32_t streamSnapHandleInit(SStreamSnapHandle* handle, char* path) {
   }
   taosCloseDir(&pDir);
 
+  SArray* list = taosArrayInit(64, sizeof(SBackendFileItem));
+
+  SBackendFileItem item;
+
+  item.name = pFile->pCurrent;
+  item.type = ROCKSDB_CURRENT_TYPE;
+  taosArrayPush(list, &item);
+
+  item.name = pFile->pMainfest;
+  item.type = ROCKSDB_MAINFEST_TYPE;
+  taosArrayPush(list, &item);
+
+  item.name = pFile->pOptions;
+  item.type = ROCKSDB_OPTIONS_TYPE;
+  taosArrayPush(list, &item);
+
+  for (int i = 0; i < taosArrayGetSize(pFile->pSst); i++) {
+    char* sst = taosArrayGetP(pFile->pSst, i);
+    item.name = sst;
+    item.type = ROCKSDB_SST_TYPE;
+    taosArrayPush(list, &item);
+  }
+
+  item.name = pFile->pCheckpointMeta;
+  item.type = ROCKSDB_CHECKPOINT_META_TYPE;
+  taosArrayPush(list, &item);
+
   handle->pBackendFile = pFile;
+
+  handle->currFileIdx = 0;
+  handle->pFileList = list;
+  handle->fd = taosOpenFile(taosArrayGetP(handle->pFileList, handle->currFileIdx), TD_FILE_READ);
+  if (handle->fd == NULL) {
+    goto _err;
+  }
+  handle->seraial = 0;
+  handle->offset = 0;
+  return 0;
 _err:
+  streamSnapHandleDestroy(handle);
+
   code = -1;
   return code;
 }
@@ -101,37 +170,81 @@ void streamSnapHandleDestroy(SStreamSnapHandle* handle) {
   taosMemoryFree(pFile->pCurrent);
   taosMemoryFree(pFile->pMainfest);
   taosMemoryFree(pFile->pOptions);
-  for (int i = 0; i < taosArrayGetSize(pFile->pSst); i++) {
+  taosMemoryFree(pFile->path);
+  for (int i = 0; pFile->pSst != NULL && i < taosArrayGetSize(pFile->pSst); i++) {
     char* sst = taosArrayGetP(pFile->pSst, i);
     taosMemoryFree(sst);
   }
   taosArrayDestroy(pFile->pSst);
+
+  taosArrayDestroy(handle->pFileList);
   taosMemoryFree(pFile);
   return;
 }
 
-int32_t streamSnapReaderOpen(void* pMeta, int64_t sver, int64_t ever, void** ppReader) {
+int32_t streamSnapReaderOpen(void* pMeta, int64_t sver, int64_t ever, SStreamSnapReader** ppReader) {
   // impl later
-  rocksdb_t* db = NULL;
+  SStreamSnapReader* pReader = taosMemoryCalloc(1, sizeof(SStreamSnapReader));
+  if (pReader == NULL) {
+    return TSDB_CODE_OUT_OF_MEMORY;
+  }
+  const char* path = NULL;
+  if (streamSnapHandleInit(&pReader->handle, (char*)path) < 0) {
+    return -1;
+  }
+
+  *ppReader = pReader;
 
   return 0;
 }
-int32_t streamSnapReaderClose(void** ppReader) {
-  // impl later
+int32_t streamSnapReaderClose(SStreamSnapReader* pReader) {
+  if (pReader == NULL) return 0;
+
+  streamSnapHandleDestroy(&pReader->handle);
+  taosMemoryFree(pReader);
   return 0;
 }
-int32_t streamSnapRead(void* pReader, uint8_t** ppData) {
+int32_t streamSnapRead(SStreamSnapReader* pReader, uint8_t** ppData, int64_t* size) {
   // impl later
+  SStreamSnapHandle* pHandle = &pReader->handle;
+  SBackendFileItem*  item = taosArrayGet(pHandle->pFileList, pHandle->currFileIdx);
+
+  uint8_t* buf = taosMemoryCalloc(1, sizeof(SStreamSnapBlockHdr) + kBlockSize);
+  int64_t  nread = taosReadFile(pHandle->fd, buf, kBlockSize);
+  if (nread == -1) {
+    // handle later
+    return -1;
+  } else {
+    taosCloseFile(&pHandle->fd);
+    pHandle->currFileIdx += 1;
+    if (pHandle->currFileIdx >= taosArrayGetSize(pHandle->pFileList)) {
+      // finish
+      return 0;
+    }
+    item = taosArrayGet(pHandle->pFileList, pHandle->currFileIdx);
+    pHandle->fd = taosOpenFile(item->name, TD_FILE_READ);
+    // handle err later
+    nread = taosReadFile(pHandle->fd, buf, kBlockSize);
+  }
+
+  SStreamSnapBlockHdr* pHdr = (SStreamSnapBlockHdr*)buf;
+  pHdr->size = nread;
+  pHdr->type = item->type;
+
+  memcpy(pHdr->name, item->name, strlen(item->name));
+  pHandle->seraial += nread;
 
+  *ppData = buf;
+  *size = sizeof(SStreamSnapBlockHdr) + nread;
   return 0;
 }
 // SMetaSnapWriter ========================================
-int32_t streamSnapWriterOpen(void* pMeta, int64_t sver, int64_t ever, void** ppWriter) {
+int32_t streamSnapWriterOpen(void* pMeta, int64_t sver, int64_t ever, StreamSnapWriter** ppWriter) {
   // impl later
   return 0;
 }
-int32_t streamSnapWrite(void* pWriter, uint8_t* pData, uint32_t nData) {
+int32_t streamSnapWrite(StreamSnapWriter* pWriter, uint8_t* pData, uint32_t nData) {
   // impl later
   return 0;
 }
-int32_t streamSnapWriterClose(void** ppWriter, int8_t rollback) { return 0; }
+int32_t streamSnapWriterClose(StreamSnapWriter** ppWriter, int8_t rollback) { return 0; }