X-Git-Url: http://git.vrable.net/?a=blobdiff_plain;f=localdb.cc;h=951f35ceb67063f8a627f2d564a39a97071ea317;hb=58a0d3f8749111c15e9afa9d929016d65ed32250;hp=4ab828368ae247fa9c4b46d81a573d841042ea90;hpb=0a76f30b578a2ace26090a4b9bbd74b04124a20e;p=cumulus.git

diff --git a/localdb.cc b/localdb.cc
index 4ab8283..951f35c 100644
--- a/localdb.cc
+++ b/localdb.cc
@@ -22,7 +22,23 @@
 
 using std::string;
 
-void LocalDb::Open(const char *path)
+/* Helper function to prepare a statement for execution in the current
+ * database. */
+sqlite3_stmt *LocalDb::Prepare(const char *sql)
+{
+    sqlite3_stmt *stmt;
+    int rc;
+    const char *tail;
+
+    rc = sqlite3_prepare(db, sql, strlen(sql), &stmt, &tail);
+    if (rc != SQLITE_OK) {
+        throw IOException(string("Error preparing statement: ") + sql);
+    }
+
+    return stmt;
+}
+
+void LocalDb::Open(const char *path, const char *snapshot_name)
 {
     int rc;
 
@@ -39,6 +55,26 @@ void LocalDb::Open(const char *path)
         sqlite3_close(db);
         throw IOException("Error starting transaction");
     }
+
+    /* Insert this snapshot into the database, and determine the integer key
+     * which will be used to identify it. */
+    sqlite3_stmt *stmt = Prepare("insert into snapshots(name, timestamp) "
+                                 "values (?, julianday('now'))");
+    sqlite3_bind_text(stmt, 1, snapshot_name, strlen(snapshot_name),
+                      SQLITE_TRANSIENT);
+
+    rc = sqlite3_step(stmt);
+    if (rc != SQLITE_DONE) {
+        sqlite3_close(db);
+        throw IOException("Database execution error!");
+    }
+
+    snapshotid = sqlite3_last_insert_rowid(db);
+    sqlite3_finalize(stmt);
+    if (snapshotid == 0) {
+        sqlite3_close(db);
+        throw IOException("Find snapshot id");
+    }
 }
 
 void LocalDb::Close()
@@ -51,23 +87,73 @@ void LocalDb::Close()
     sqlite3_close(db);
 }
 
+int64_t LocalDb::SegmentToId(const string &segment)
+{
+    int rc;
+    sqlite3_stmt *stmt;
+    int64_t result;
+
+    stmt = Prepare("insert or ignore into segments(segment) values (?)");
+    sqlite3_bind_text(stmt, 1, segment.c_str(), segment.size(),
+                      SQLITE_TRANSIENT);
+    rc = sqlite3_step(stmt);
+    if (rc != SQLITE_DONE) {
+        throw IOException("Could not execute INSERT statement!");
+    }
+    sqlite3_finalize(stmt);
+
+    stmt = Prepare("select segmentid from segments where segment = ?");
+    sqlite3_bind_text(stmt, 1, segment.c_str(), segment.size(),
+                      SQLITE_TRANSIENT);
+
+    rc = sqlite3_step(stmt);
+    if (rc == SQLITE_DONE) {
+        throw IOException("No segment found by id");
+    } else if (rc == SQLITE_ROW) {
+        result = sqlite3_column_int64(stmt, 0);
+    } else {
+        throw IOException("Error executing find segment by id query");
+    }
+
+    sqlite3_finalize(stmt);
+
+    return result;
+}
+
+string LocalDb::IdToSegment(int64_t segmentid)
+{
+    int rc;
+    sqlite3_stmt *stmt;
+    string result;
+
+    stmt = Prepare("select segment from segments where segmentid = ?");
+    sqlite3_bind_int64(stmt, 1, segmentid);
+
+    rc = sqlite3_step(stmt);
+    if (rc == SQLITE_DONE) {
+        throw IOException("No segment found by id");
+    } else if (rc == SQLITE_ROW) {
+        result = (const char *)sqlite3_column_text(stmt, 0);
+    } else {
+        throw IOException("Error executing find segment by id query");
+    }
+
+    sqlite3_finalize(stmt);
+
+    return result;
+}
+
 void LocalDb::StoreObject(const ObjectReference& ref,
                           const string &checksum, int64_t size)
 {
     int rc;
     sqlite3_stmt *stmt;
-    static const char s[] =
-        "insert into block_index(segment, object, checksum, size) "
-        "values (?, ?, ?, ?)";
-    const char *tail;
 
-    rc = sqlite3_prepare_v2(db, s, strlen(s), &stmt, &tail);
-    if (rc != SQLITE_OK) {
-        return;
-    }
+    stmt = Prepare("insert into "
+                   "block_index(segmentid, object, checksum, size, timestamp) "
+                   "values (?, ?, ?, ?, julianday('now'))");
 
-    string seg = ref.get_segment();
-    sqlite3_bind_text(stmt, 1, seg.c_str(), seg.size(), SQLITE_TRANSIENT);
+    sqlite3_bind_int64(stmt, 1, SegmentToId(ref.get_segment()));
     string obj = ref.get_sequence();
     sqlite3_bind_text(stmt, 2, obj.c_str(), obj.size(), SQLITE_TRANSIENT);
     sqlite3_bind_text(stmt, 3, checksum.c_str(), checksum.size(),
@@ -86,18 +172,10 @@ ObjectReference LocalDb::FindObject(const string &checksum, int64_t size)
 {
     int rc;
     sqlite3_stmt *stmt;
-    static const char s[] =
-        "select segment, object from block_index "
-        "where checksum = ? and size = ?";
-    const char *tail;
-
     ObjectReference ref;
 
-    rc = sqlite3_prepare_v2(db, s, strlen(s), &stmt, &tail);
-    if (rc != SQLITE_OK) {
-        return ref;
-    }
-
+    stmt = Prepare("select segmentid, object from block_index "
+                   "where checksum = ? and size = ? and expired is null");
     sqlite3_bind_text(stmt, 1, checksum.c_str(), checksum.size(),
                       SQLITE_TRANSIENT);
     sqlite3_bind_int64(stmt, 2, size);
@@ -105,9 +183,7 @@ ObjectReference LocalDb::FindObject(const string &checksum, int64_t size)
     rc = sqlite3_step(stmt);
     if (rc == SQLITE_DONE) {
     } else if (rc == SQLITE_ROW) {
-        printf("Can re-use block: %s/%s\n",
-               sqlite3_column_text(stmt, 0), sqlite3_column_text(stmt, 1));
-        ref = ObjectReference((const char *)sqlite3_column_text(stmt, 0),
+        ref = ObjectReference(IdToSegment(sqlite3_column_int64(stmt, 0)),
                               (const char *)sqlite3_column_text(stmt, 1));
     } else {
         fprintf(stderr, "Could not execute SELECT statement!\n");
@@ -117,3 +193,50 @@ ObjectReference LocalDb::FindObject(const string &checksum, int64_t size)
 
     return ref;
 }
+
+bool LocalDb::IsOldObject(const string &checksum, int64_t size)
+{
+    int rc;
+    sqlite3_stmt *stmt;
+    bool found = false;
+
+    stmt = Prepare("select segmentid, object from block_index "
+                   "where checksum = ? and size = ?");
+    sqlite3_bind_text(stmt, 1, checksum.c_str(), checksum.size(),
+                      SQLITE_TRANSIENT);
+    sqlite3_bind_int64(stmt, 2, size);
+
+    rc = sqlite3_step(stmt);
+    if (rc == SQLITE_DONE) {
+        found = false;
+    } else if (rc == SQLITE_ROW) {
+        found = true;
+    } else {
+        fprintf(stderr, "Could not execute SELECT statement!\n");
+    }
+
+    sqlite3_finalize(stmt);
+
+    return found;
+}
+
+void LocalDb::UseObject(const ObjectReference& ref)
+{
+    int rc;
+    sqlite3_stmt *stmt;
+
+    stmt = Prepare("insert or ignore into snapshot_contents "
+                   "select blockid, ? as snapshotid from block_index "
+                   "where segmentid = ? and object = ?");
+    sqlite3_bind_int64(stmt, 1, snapshotid);
+    sqlite3_bind_int64(stmt, 2, SegmentToId(ref.get_segment()));
+    string obj = ref.get_sequence();
+    sqlite3_bind_text(stmt, 3, obj.c_str(), obj.size(), SQLITE_TRANSIENT);
+
+    rc = sqlite3_step(stmt);
+    if (rc != SQLITE_DONE) {
+        fprintf(stderr, "Could not execute INSERT statement!\n");
+    }
+
+    sqlite3_finalize(stmt);
+}