#include <string.h>
#include <sqlite3.h>
+#include <algorithm>
#include <string>
#include "localdb.h"
#include "store.h"
+using std::min;
using std::string;
/* Helper function to prepare a statement for execution in the current
sqlite3_extended_result_codes(db, 1);
+ if (snapshot_scheme == NULL)
+ snapshot_scheme = "";
+
/* Insert this snapshot into the database, and determine the integer key
* which will be used to identify it. */
sqlite3_stmt *stmt = Prepare("insert into "
"values (?, ?, julianday('now'), ?)");
sqlite3_bind_text(stmt, 1, snapshot_name, strlen(snapshot_name),
SQLITE_TRANSIENT);
- if (snapshot_scheme == NULL)
- sqlite3_bind_null(stmt, 2);
- else
- sqlite3_bind_text(stmt, 2, snapshot_scheme, strlen(snapshot_scheme),
- SQLITE_TRANSIENT);
+ sqlite3_bind_text(stmt, 2, snapshot_scheme, strlen(snapshot_scheme),
+ SQLITE_TRANSIENT);
sqlite3_bind_double(stmt, 3, intent);
rc = sqlite3_step(stmt);
if (!ref.is_normal())
return;
- stmt = Prepare("insert or ignore into snapshot_refs "
- "select segmentid, object, size from block_index "
+ int64_t old_size = 0;
+ stmt = Prepare("select size from snapshot_refs "
"where segmentid = ? and object = ?");
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);
-
rc = sqlite3_step(stmt);
- if (rc != SQLITE_DONE) {
- fprintf(stderr, "Could not execute INSERT statement!\n");
- ReportError(rc);
+ if (rc == SQLITE_ROW) {
+ old_size = sqlite3_column_int64(stmt, 0);
}
+ sqlite3_finalize(stmt);
+ int64_t block_size = 0;
+ stmt = Prepare("select size from block_index "
+ "where segmentid = ? and object = ?");
+ sqlite3_bind_int64(stmt, 1, SegmentToId(ref.get_segment()));
+ obj = ref.get_sequence();
+ sqlite3_bind_text(stmt, 2, obj.c_str(), obj.size(), SQLITE_TRANSIENT);
+ rc = sqlite3_step(stmt);
+ if (rc == SQLITE_ROW) {
+ block_size = sqlite3_column_int64(stmt, 0);
+ } else {
+ string refstr = ref.to_string();
+ fprintf(stderr, "No block found in block_index for %s\n",
+ refstr.c_str());
+ sqlite3_finalize(stmt);
+ return;
+ }
sqlite3_finalize(stmt);
+
+ int64_t new_size = old_size;
+ if (ref.has_range()) {
+ new_size += ref.get_range_length();
+ new_size = min(new_size, block_size);
+ } else {
+ new_size = block_size;
+ }
+
+ if (new_size != old_size) {
+ stmt = Prepare("insert or replace "
+ "into snapshot_refs(segmentid, object, size) "
+ "values (?, ?, ?)");
+ sqlite3_bind_int64(stmt, 1, SegmentToId(ref.get_segment()));
+ obj = ref.get_sequence();
+ sqlite3_bind_text(stmt, 2, obj.c_str(), obj.size(), SQLITE_TRANSIENT);
+ sqlite3_bind_int64(stmt, 3, new_size);
+
+ rc = sqlite3_step(stmt);
+ if (rc != SQLITE_DONE) {
+ fprintf(stderr, "Could not execute INSERT statement!\n");
+ ReportError(rc);
+ }
+
+ sqlite3_finalize(stmt);
+ }
}
void LocalDb::UseSegment(const std::string &segment, double utilization)
return found;
}
+
+/* Look up and return the packed representation of the subblock chunk
+ * signatures. Returns true if signatures were found for the specified object,
+ * and if so sets *buf to point at a buffer of memory (allocated with malloc;
+ * the caller should free it), and *len to the length of the buffer. */
+bool LocalDb::LoadChunkSignatures(ObjectReference ref,
+ void **buf, size_t *len,
+ string *algorithm)
+{
+ int rc;
+ sqlite3_stmt *stmt;
+ int found = false;
+
+ stmt = Prepare("select signatures, algorithm from subblock_signatures "
+ "where blockid = (select blockid from block_index "
+ " where segmentid = ? and object = ?)");
+ 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);
+
+ rc = sqlite3_step(stmt);
+ if (rc == SQLITE_DONE) {
+ } else if (rc == SQLITE_ROW) {
+ const void *data = sqlite3_column_blob(stmt, 0);
+ *len = sqlite3_column_bytes(stmt, 0);
+
+ if (*len > 0) {
+ *buf = malloc(*len);
+ if (*buf != NULL) {
+ memcpy(*buf, data, *len);
+ *algorithm = (const char *)sqlite3_column_text(stmt, 1);
+ found = true;
+ }
+ }
+ } else {
+ fprintf(stderr, "Could not execute SELECT statement!\n");
+ ReportError(rc);
+ }
+
+ sqlite3_finalize(stmt);
+
+ return found;
+}
+
+/* Store the subblock chunk signatures for a specified object. The object
+ * itself must have already been indexed in the database. */
+void LocalDb::StoreChunkSignatures(ObjectReference ref,
+ const void *buf, size_t len,
+ const string& algorithm)
+{
+ int rc;
+ sqlite3_stmt *stmt;
+
+ stmt = Prepare("select blockid from block_index "
+ "where segmentid = ? and object = ?");
+ 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);
+
+ rc = sqlite3_step(stmt);
+ if (rc != SQLITE_ROW) {
+ fprintf(stderr,
+ "Could not determine blockid in StoreChunkSignatures!\n");
+ ReportError(rc);
+ throw IOException("Error getting blockid");
+ }
+ int64_t blockid = sqlite3_column_int64(stmt, 0);
+ sqlite3_finalize(stmt);
+
+ stmt = Prepare("insert or replace "
+ "into subblock_signatures(blockid, algorithm, signatures) "
+ "values (?, ?, ?)");
+ sqlite3_bind_int64(stmt, 1, blockid);
+ sqlite3_bind_text(stmt, 2, algorithm.c_str(), algorithm.size(),
+ SQLITE_TRANSIENT);
+ sqlite3_bind_blob(stmt, 3, buf, len, SQLITE_TRANSIENT);
+
+ rc = sqlite3_step(stmt);
+ if (rc != SQLITE_DONE) {
+ fprintf(stderr, "Could not insert sub-block checksums!\n");
+ ReportError(rc);
+ }
+
+ sqlite3_finalize(stmt);
+}