From 652331bd18d3035055cf20e0db0a3287349b82c4 Mon Sep 17 00:00:00 2001
From: Hongze Cheng <hzcheng@taosdata.com>
Date: Tue, 9 Jun 2020 03:54:08 +0000
Subject: [PATCH] more

---
 src/util/src/tkvstore.c | 108 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 104 insertions(+), 4 deletions(-)

diff --git a/src/util/src/tkvstore.c b/src/util/src/tkvstore.c
index 03bf4b1b00..f6ccdc9333 100644
--- a/src/util/src/tkvstore.c
+++ b/src/util/src/tkvstore.c
@@ -34,7 +34,7 @@
 #define TD_KVSTORE_SNAP_SUFFIX ".snap"
 #define TD_KVSTORE_NEW_SUFFIX ".new"
 
-typedef struct {
+typedef struct __attribute__((packed)) {
   uint64_t uid;
   int64_t  offset;
   int32_t  size;
@@ -49,6 +49,9 @@ static char *    tdGetKVStoreNewFname(char *fdata);
 static void      tdFreeKVStore(SKVStore *pStore);
 static int       tdUpdateKVStoreHeader(int fd, char *fname, SStoreInfo *pInfo);
 static int       tdLoadKVStoreHeader(int fd, char *fname, SStoreInfo *pInfo);
+// static void *    tdEncodeKVRecord(void *buf, SKVRecord *pRecord);
+static void *    tdDecodeKVRecord(void *buf, SKVRecord *pRecord);
+static int       tdRestoreKVStore(SKVStore *pStore);
 
 int tdCreateKVStore(char *fname) {
   char *tname = strdup(fname);
@@ -78,6 +81,7 @@ int tdCreateKVStore(char *fname) {
 
 SKVStore *tdOpenKVStore(char *fname, iterFunc iFunc, afterFunc aFunc, void *appH) {
   SStoreInfo info = {0};
+
   SKVStore *pStore = tdNewKVStore(fname, iFunc, aFunc, appH);
   if (pStore == NULL) return NULL;
 
@@ -121,9 +125,11 @@ SKVStore *tdOpenKVStore(char *fname, iterFunc iFunc, afterFunc aFunc, void *appH
     goto _err;
   }
 
-  while (true) {
-    
-  }
+  terrno = tdRestoreKVStore(pStore);
+  if (terrno != TSDB_CODE_SUCCESS) goto _err;
+
+  close(pStore->fd);
+  pStore->fd = -1;
 
   return pStore;
 
@@ -335,4 +341,98 @@ static char *tdGetKVStoreNewFname(char *fdata) {
   }
   sprintf(fname, "%s%s", fdata, TD_KVSTORE_NEW_SUFFIX);
   return fname;
+}
+
+// static void *tdEncodeKVRecord(void *buf, SKVRecord *pRecord) {
+//   buf = taosEncodeFixedU64(buf, pRecord->uid);
+//   buf = taosEncodeFixedI64(buf, pRecord->offset);
+//   buf = taosEncodeFixedI32(buf, pRecord->size);
+
+//   return buf;
+// }
+
+static void *tdDecodeKVRecord(void *buf, SKVRecord *pRecord) {
+  buf = taosDecodeFixedU64(buf, &(pRecord->uid));
+  buf = taosDecodeFixedI64(buf, &(pRecord->offset));
+  buf = taosDecodeFixedI32(buf, &(pRecord->size));
+
+  return buf;
+}
+
+static int tdRestoreKVStore(SKVStore *pStore) {
+  char      tbuf[128] = "\0";
+  char *    buf = NULL;
+  SKVRecord rInfo = {0};
+
+  while (true) {
+    ssize_t tsize = tread(pStore->fd, tbuf, sizeof(SKVRecord));
+    if (tsize == 0) break;
+    if (tsize < sizeof(SKVRecord)) {
+      uError("failed to read %d bytes from file %s since %s", sizeof(SKVRecord), pStore->fname, strerror(errno));
+      terrno = TAOS_SYSTEM_ERROR(errno);
+      goto _err;
+    }
+
+    char *pBuf = tdDecodeKVRecord(tbuf, &rInfo);
+    ASSERT(POINTER_DISTANCE(pBuf, tbuf) == sizeof(SKVRecord));
+
+    if (rInfo.offset < 0) {
+      taosHashRemove(pStore->map, (void *)(&rInfo.uid), sizeof(rInfo.uid));
+    } else {
+      ASSERT(rInfo.offset > 0);
+      if (taosHashPut(pStore->map, (void *)(&rInfo.uid), sizeof(rInfo.uid), &rInfo, sizeof(rInfo)) < 0) {
+        uError("failed to put record in KV store %s", pStore->fname);
+        terrno = TSDB_CODE_COM_OUT_OF_MEMORY;
+        goto _err;
+      }
+
+      if (lseek(pStore->fd, rInfo.size, SEEK_CUR) < 0) {
+        uError("failed to lseek file %s since %s", pStore->fname, strerror(errno));
+        terrno = TAOS_SYSTEM_ERROR(errno);
+        goto _err;
+      }
+    }
+  }
+
+  SHashMutableIterator *pIter = taosHashCreateIter(pStore->map);
+  if (pIter == NULL) {
+    uError("failed to create hash iter while opening KV store %s", pStore->fname);
+    terrno = TSDB_CODE_COM_OUT_OF_MEMORY;
+    goto _err;
+  }
+
+  while (taosHashIterNext(pIter)) {
+    SKVRecord *pRecord = taosHashIterGet(pIter);
+
+    if (lseek(pStore->fd, pRecord->offset, SEEK_SET) < 0) {
+      uError("failed to lseek file %s since %s", pStore->fname, strerror(errno));
+      terrno = TAOS_SYSTEM_ERROR(errno);
+      goto _err;
+    }
+
+    if (tread(pStore->fd, buf, pRecord->size) < pRecord->size) {
+      uError("failed to read %d bytes from file %s since %s", pRecord->size, pStore->fname, strerror(errno));
+      terrno = TAOS_SYSTEM_ERROR(errno);
+      goto _err;
+    }
+
+    if (!taosCheckChecksumWhole((uint8_t *)buf, pRecord->size)) {
+      uError("file %s has checksum error, offset " PRId64 " size %d", pStore->fname, pRecord->offset, pRecord->size);
+      terrno = TSDB_CODE_TDB_FILE_CORRUPTED;
+      goto _err;
+    }
+
+    if (pStore->iFunc) (*pStore->iFunc)(pStore->appH,buf, pRecord->size);
+  }
+
+  taosHashDestroyIter(pIter);
+
+  if (pStore->aFunc) (*pStore->aFunc)(pStore->appH);
+
+  tfree(buf);
+  return TSDB_CODE_SUCCESS;
+
+_err:
+  tfree(buf);
+  return terrno;
 }
\ No newline at end of file