X-Git-Url: http://git.vrable.net/?a=blobdiff_plain;f=localdb.cc;h=077c927e524041a4010e33fc58f09aa219318582;hb=38ae53bac981d564d9f04c038a88d727289db5c8;hp=5c1f7e55b2424015e525db895ac7f738b09d4dab;hpb=a4cf5f4d8df46fa00992a210d587cd824cedcb08;p=cumulus.git diff --git a/localdb.cc b/localdb.cc index 5c1f7e5..077c927 100644 --- a/localdb.cc +++ b/localdb.cc @@ -30,16 +30,23 @@ sqlite3_stmt *LocalDb::Prepare(const char *sql) int rc; const char *tail; - rc = sqlite3_prepare(db, sql, strlen(sql), &stmt, &tail); + rc = sqlite3_prepare_v2(db, sql, strlen(sql), &stmt, &tail); if (rc != SQLITE_OK) { + ReportError(rc); throw IOException(string("Error preparing statement: ") + sql); } return stmt; } +void LocalDb::ReportError(int rc) +{ + fprintf(stderr, "Result code: %d\n", rc); + fprintf(stderr, "Error message: %s\n", sqlite3_errmsg(db)); +} + void LocalDb::Open(const char *path, const char *snapshot_name, - const char *snapshot_scheme) + const char *snapshot_scheme, double intent) { int rc; @@ -57,11 +64,13 @@ void LocalDb::Open(const char *path, const char *snapshot_name, throw IOException("Error starting transaction"); } + sqlite3_extended_result_codes(db, 1); + /* 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, scheme, timestamp) " - "values (?, ?, julianday('now'))"); + "snapshots(name, scheme, timestamp, intent) " + "values (?, ?, julianday('now'), ?)"); sqlite3_bind_text(stmt, 1, snapshot_name, strlen(snapshot_name), SQLITE_TRANSIENT); if (snapshot_scheme == NULL) @@ -69,9 +78,11 @@ void LocalDb::Open(const char *path, const char *snapshot_name, else sqlite3_bind_text(stmt, 2, snapshot_scheme, strlen(snapshot_scheme), SQLITE_TRANSIENT); + sqlite3_bind_double(stmt, 3, intent); rc = sqlite3_step(stmt); if (rc != SQLITE_DONE) { + ReportError(rc); sqlite3_close(db); throw IOException("Database execution error!"); } @@ -79,17 +90,69 @@ void LocalDb::Open(const char *path, const char *snapshot_name, snapshotid = sqlite3_last_insert_rowid(db); sqlite3_finalize(stmt); if (snapshotid == 0) { + ReportError(rc); sqlite3_close(db); throw IOException("Find snapshot id"); } + + /* Create a temporary table which will be used to keep track of the objects + * used by this snapshot. When the database is closed, we will summarize + * the results of this table into segments_used. */ + rc = sqlite3_exec(db, + "create temporary table snapshot_refs (" + " segmentid integer not null," + " object text not null," + " size integer not null" + ")", NULL, NULL, NULL); + if (rc != SQLITE_OK) { + ReportError(rc); + sqlite3_close(db); + throw IOException("Database initialization"); + } + rc = sqlite3_exec(db, + "create unique index snapshot_refs_index " + "on snapshot_refs(segmentid, object)", + NULL, NULL, NULL); + if (rc != SQLITE_OK) { + ReportError(rc); + sqlite3_close(db); + throw IOException("Database initialization"); + } } void LocalDb::Close() { int rc; + + /* Summarize the snapshot_refs table into segments_used. */ + sqlite3_stmt *stmt = Prepare( + "insert or replace into segments_used " + "select ? as snapshotid, segmentid, max(utilization) from (" + " select segmentid, cast(used as real) / size as utilization " + " from " + " (select segmentid, sum(size) as used from snapshot_refs " + " group by segmentid) " + " join segments using (segmentid) " + " union " + " select segmentid, utilization from segments_used " + " where snapshotid = ? " + ") group by segmentid" + ); + sqlite3_bind_int64(stmt, 1, snapshotid); + sqlite3_bind_int64(stmt, 2, snapshotid); + rc = sqlite3_step(stmt); + if (rc != SQLITE_OK && rc != SQLITE_DONE) { + ReportError(rc); + sqlite3_close(db); + fprintf(stderr, "DATABASE ERROR: Unable to create segment summary!\n"); + } + sqlite3_finalize(stmt); + + /* Commit changes to the database and close. */ rc = sqlite3_exec(db, "commit", NULL, NULL, NULL); if (rc != SQLITE_OK) { - fprintf(stderr, "Can't commit database!\n"); + fprintf(stderr, "DATABASE ERROR: Can't commit database!\n"); + ReportError(rc); } sqlite3_close(db); } @@ -179,9 +242,21 @@ void LocalDb::StoreObject(const ObjectReference& ref, rc = sqlite3_step(stmt); if (rc != SQLITE_DONE) { fprintf(stderr, "Could not execute INSERT statement!\n"); + ReportError(rc); } sqlite3_finalize(stmt); + + if (age != 0.0) { + stmt = Prepare("update segments " + "set mtime = coalesce(max(mtime, ?), ?) " + "where segmentid = ?"); + sqlite3_bind_double(stmt, 1, age); + sqlite3_bind_double(stmt, 2, age); + sqlite3_bind_int64(stmt, 3, SegmentToId(ref.get_segment())); + rc = sqlite3_step(stmt); + sqlite3_finalize(stmt); + } } ObjectReference LocalDb::FindObject(const string &checksum, int64_t size) @@ -201,8 +276,10 @@ ObjectReference LocalDb::FindObject(const string &checksum, int64_t size) } else if (rc == SQLITE_ROW) { ref = ObjectReference(IdToSegment(sqlite3_column_int64(stmt, 0)), (const char *)sqlite3_column_text(stmt, 1)); + ref.set_range(0, size); } else { fprintf(stderr, "Could not execute SELECT statement!\n"); + ReportError(rc); } sqlite3_finalize(stmt); @@ -210,14 +287,15 @@ ObjectReference LocalDb::FindObject(const string &checksum, int64_t size) return ref; } -bool LocalDb::IsOldObject(const string &checksum, int64_t size, double *age) +bool LocalDb::IsOldObject(const string &checksum, int64_t size, double *age, + int *group) { int rc; sqlite3_stmt *stmt; bool found = false; - stmt = Prepare("select segmentid, object, timestamp from block_index " - "where checksum = ? and size = ?"); + stmt = Prepare("select segmentid, object, timestamp, expired " + "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); @@ -228,8 +306,10 @@ bool LocalDb::IsOldObject(const string &checksum, int64_t size, double *age) } else if (rc == SQLITE_ROW) { found = true; *age = sqlite3_column_double(stmt, 2); + *group = sqlite3_column_int(stmt, 3); } else { fprintf(stderr, "Could not execute SELECT statement!\n"); + ReportError(rc); } sqlite3_finalize(stmt); @@ -244,6 +324,11 @@ bool LocalDb::IsAvailable(const ObjectReference &ref) sqlite3_stmt *stmt; bool found = false; + // Special objects (such as the zero object) aren't stored in segments, and + // so are always available. + if (!ref.is_normal()) + return true; + stmt = Prepare("select count(*) from block_index " "where segmentid = ? and object = ? and expired is null"); sqlite3_bind_int64(stmt, 1, SegmentToId(ref.get_segment())); @@ -258,6 +343,7 @@ bool LocalDb::IsAvailable(const ObjectReference &ref) found = true; } else { fprintf(stderr, "Could not execute SELECT statement!\n"); + ReportError(rc); } sqlite3_finalize(stmt); @@ -270,17 +356,41 @@ 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 " + if (!ref.is_normal()) + return; + + stmt = Prepare("insert or ignore into snapshot_refs " + "select segmentid, object, size from block_index " "where segmentid = ? and object = ?"); - sqlite3_bind_int64(stmt, 1, snapshotid); - sqlite3_bind_int64(stmt, 2, SegmentToId(ref.get_segment())); + sqlite3_bind_int64(stmt, 1, SegmentToId(ref.get_segment())); string obj = ref.get_sequence(); - sqlite3_bind_text(stmt, 3, obj.c_str(), obj.size(), SQLITE_TRANSIENT); + 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); + } + + sqlite3_finalize(stmt); +} + +void LocalDb::UseSegment(const std::string &segment, double utilization) +{ + int rc; + sqlite3_stmt *stmt; + + stmt = Prepare("insert or replace " + "into segments_used(snapshotid, segmentid, utilization) " + "values (?, ?, ?)"); + sqlite3_bind_int64(stmt, 1, snapshotid); + sqlite3_bind_int64(stmt, 2, SegmentToId(segment)); + sqlite3_bind_double(stmt, 3, utilization); + + rc = sqlite3_step(stmt); + if (rc != SQLITE_DONE) { + fprintf(stderr, "Could not insert segment use record!\n"); + ReportError(rc); } sqlite3_finalize(stmt); @@ -288,23 +398,67 @@ void LocalDb::UseObject(const ObjectReference& ref) void LocalDb::SetSegmentChecksum(const std::string &segment, const std::string &path, - const std::string &checksum) + const std::string &checksum, + int size) { int rc; sqlite3_stmt *stmt; - stmt = Prepare("update segments set path = ?, checksum = ? " + stmt = Prepare("update segments set path = ?, checksum = ?, size = ?, " + "mtime = coalesce(mtime, julianday('now')) " "where segmentid = ?"); sqlite3_bind_text(stmt, 1, path.c_str(), path.size(), SQLITE_TRANSIENT); sqlite3_bind_text(stmt, 2, checksum.c_str(), checksum.size(), SQLITE_TRANSIENT); - sqlite3_bind_int64(stmt, 3, SegmentToId(segment)); + sqlite3_bind_int64(stmt, 3, size); + sqlite3_bind_int64(stmt, 4, SegmentToId(segment)); rc = sqlite3_step(stmt); if (rc != SQLITE_DONE) { fprintf(stderr, "Could not update segment checksum in database!\n"); + ReportError(rc); } sqlite3_finalize(stmt); } + +bool LocalDb::GetSegmentChecksum(const string &segment, + string *seg_path, + string *seg_checksum) +{ + int rc; + sqlite3_stmt *stmt; + ObjectReference ref; + int found = false; + + stmt = Prepare("select path, checksum from segments where segment = ?"); + sqlite3_bind_text(stmt, 1, segment.c_str(), segment.size(), + SQLITE_TRANSIENT); + + rc = sqlite3_step(stmt); + if (rc == SQLITE_DONE) { + } else if (rc == SQLITE_ROW) { + found = true; + const char *val; + + val = (const char *)sqlite3_column_text(stmt, 0); + if (val == NULL) + found = false; + else + *seg_path = val; + + val = (const char *)sqlite3_column_text(stmt, 1); + if (val == NULL) + found = false; + else + *seg_checksum = val; + } else { + fprintf(stderr, "Could not execute SELECT statement!\n"); + ReportError(rc); + } + + sqlite3_finalize(stmt); + + return found; +}