support reopen stream state

source/libs/stream/src/streamBackendRocksdb.c

@@ -20,6 +20,17 @@
 #include "tcommon.h"
 #include "tref.h"
 
+typedef struct {
+  char*   pCurrent;
+  char*   pManifest;
+  SArray* pSST;
+  int64_t preCkptId;
+  int64_t curChkpId;
+  char*   path;
+  char*   buf;
+  int32_t len;
+} SBackendManager;
+
 typedef struct SCompactFilteFactory {
   void* status;
 } SCompactFilteFactory;
@@ -127,6 +138,46 @@ void    destroyFunc(void* arg);
 int32_t encodeValueFunc(void* value, int32_t vlen, int64_t ttl, char** dest);
 int32_t decodeValueFunc(void* value, int32_t vlen, int64_t* ttl, char** dest);
 
+SBackendManager* backendManagerCreate(char* path) {
+  SBackendManager* p = taosMemoryCalloc(1, sizeof(SBackendManager));
+  p->curChkpId = 0;
+  p->preCkptId = 0;
+  p->pSST = taosArrayInit(64, sizeof(void*));
+  p->path = taosStrdup(path);
+
+  p->len = strlen(path) + 128;
+  p->buf = taosMemoryCalloc(1, p->len);
+  return p;
+}
+
+int32_t backendManagerGetDelta(SBackendManager* bm, int64_t chkpId, SArray* list) {
+  memset(bm->buf, 0, bm->len);
+  sprintf(bm->buf, "%s%scheckpoint%" PRId64 "", bm->path, TD_DIRSEP, chkpId);
+
+  TdDirPtr      pDir = taosOpenDir(bm->buf);
+  TdDirEntryPtr de = NULL;
+
+  while ((de = taosReadDir(pDir)) != NULL) {
+    char* name = taosGetDirEntryName(de);
+    if (strcmp(name, ".") == 0 || strcmp(name, "..") == 0) continue;
+
+
+    // sprintf(absSrcPath, "%s%s%s", src, TD_DIRSEP, name);
+    // sprintf(absDstPath, "%s%s%s", dst, TD_DIRSEP, name);
+    // if (!taosDirEntryIsDir(de)) {
+    //    code = taosCopyFile(absSrcPath, absDstPath);
+    //    if (code == -1) {
+    //      goto _err;
+    //    }
+    //  }
+
+    // memset(absSrcPath, 0, sLen + 64);
+    // memset(absDstPath, 0, dLen + 64);
+  }
+
+  return 0;
+}
+
 SCfInit ginitDict[] = {
     {"default", 7, 0, defaultKeyComp, defaultKeyEncode, defaultKeyDecode, defaultKeyToString, compareDefaultName,
      destroyFunc, encodeValueFunc, decodeValueFunc},
@@ -219,6 +270,7 @@ int32_t rebuildDirFromCheckpoint(const char* path, int64_t chkpId, char** dst) {
 
   return 0;
 }
+
 void* streamBackendInit(const char* streamPath, int64_t chkpId) {
   char*   backendPath = NULL;
   int32_t code = rebuildDirFromCheckpoint(streamPath, chkpId, &backendPath);