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wallet: fix sqlite3 column renaming since db backup merge.

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Because db->conn is a void *, changing it (from a direct pointer to
a pointer to a pair of pointers) did not break compile if one place hadn't
been update.

The result was a confusing failure: sqlite3 complaining about API misuse,
since the db->conn pointer was not a valid db handle any more.

This is one case where avoiding a void * is hard: we might not even
have the postgresql types, since it might not be installed.  But a union
would have been superior here.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2021-11-18 10:29:40 +10:30
parent d8c59fca77
commit efeb1bc65b
1 changed files with 23 additions and 10 deletions
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33
wallet/db_sqlite3.c
View file

@ -462,15 +462,17 @@ static char **prepare_table_manip(const tal_t *ctx,
char *cmd, *bracket;
char **parts;
int err;
struct db_sqlite3 *wrapper = (struct db_sqlite3 *)db->conn;
/* Get schema. */
sqlite3_prepare_v2(db->conn, "SELECT sql FROM sqlite_master WHERE type = ? AND name = ?;", -1, &stmt, NULL);
sqlite3_prepare_v2(wrapper->conn, "SELECT sql FROM sqlite_master WHERE type = ? AND name = ?;", -1, &stmt, NULL);
sqlite3_bind_text(stmt, 1, "table", strlen("table"), SQLITE_TRANSIENT);
sqlite3_bind_text(stmt, 2, tablename, strlen(tablename), SQLITE_TRANSIENT);
err = sqlite3_step(stmt);
if (err != SQLITE_ROW) {
db->error = tal_fmt(db, "getting schema: %s",
sqlite3_errmsg(db->conn));
sqlite3_errmsg(wrapper->conn));
sqlite3_finalize(stmt);
return NULL;
}
@ -489,22 +491,26 @@ static char **prepare_table_manip(const tal_t *ctx,
parts = tal_strsplit(ctx, bracket + 1, ",", STR_EMPTY_OK);
/* Turn off foreign keys first. */
sqlite3_prepare_v2(db->conn, "PRAGMA foreign_keys = OFF;", -1, &stmt, NULL);
sqlite3_prepare_v2(wrapper->conn, "PRAGMA foreign_keys = OFF;", -1, &stmt, NULL);
if (sqlite3_step(stmt) != SQLITE_DONE)
goto sqlite_stmt_err;
sqlite3_finalize(stmt);
cmd = tal_fmt(tmpctx, "ALTER TABLE %s RENAME TO temp_%s;",
tablename, tablename);
sqlite3_prepare_v2(db->conn, cmd, -1, &stmt, NULL);
sqlite3_prepare_v2(wrapper->conn, cmd, -1, &stmt, NULL);
if (sqlite3_step(stmt) != SQLITE_DONE)
goto sqlite_stmt_err;
sqlite3_finalize(stmt);
/* Make sure we do the same to backup! */
replicate_statement(wrapper, "PRAGMA foreign_keys = OFF;");
replicate_statement(wrapper, cmd);
return parts;
sqlite_stmt_err:
db->error = tal_fmt(db, "%s", sqlite3_errmsg(db->conn));
db->error = tal_fmt(db, "%s", sqlite3_errmsg(wrapper->conn));
sqlite3_finalize(stmt);
return tal_free(parts);
}
@ -516,6 +522,7 @@ static bool complete_table_manip(struct db *db,
{
sqlite3_stmt *stmt;
char *create_cmd, *insert_cmd, *drop_cmd;
struct db_sqlite3 *wrapper = (struct db_sqlite3 *)db->conn;
/* Create table */
create_cmd = tal_fmt(tmpctx, "CREATE TABLE %s (", tablename);
@ -526,11 +533,14 @@ static bool complete_table_manip(struct db *db,
}
tal_append_fmt(&create_cmd, ";");
sqlite3_prepare_v2(db->conn, create_cmd, -1, &stmt, NULL);
sqlite3_prepare_v2(wrapper->conn, create_cmd, -1, &stmt, NULL);
if (sqlite3_step(stmt) != SQLITE_DONE)
goto sqlite_stmt_err;
sqlite3_finalize(stmt);
/* Make sure we do the same to backup! */
replicate_statement(wrapper, create_cmd);
/* Populate table from old one */
insert_cmd = tal_fmt(tmpctx, "INSERT INTO %s SELECT ", tablename);
for (size_t i = 0; i < tal_count(oldcolnames); i++) {
@ -540,28 +550,31 @@ static bool complete_table_manip(struct db *db,
}
tal_append_fmt(&insert_cmd, " FROM temp_%s;", tablename);
sqlite3_prepare_v2(db->conn, insert_cmd, -1, &stmt, NULL);
sqlite3_prepare_v2(wrapper->conn, insert_cmd, -1, &stmt, NULL);
if (sqlite3_step(stmt) != SQLITE_DONE)
goto sqlite_stmt_err;
sqlite3_finalize(stmt);
replicate_statement(wrapper, insert_cmd);
/* Cleanup temp table */
drop_cmd = tal_fmt(tmpctx, "DROP TABLE temp_%s;", tablename);
sqlite3_prepare_v2(db->conn, drop_cmd, -1, &stmt, NULL);
sqlite3_prepare_v2(wrapper->conn, drop_cmd, -1, &stmt, NULL);
if (sqlite3_step(stmt) != SQLITE_DONE)
goto sqlite_stmt_err;
sqlite3_finalize(stmt);
replicate_statement(wrapper, drop_cmd);
/* Allow links between them (esp. cascade deletes!) */
sqlite3_prepare_v2(db->conn, "PRAGMA foreign_keys = ON;", -1, &stmt, NULL);
sqlite3_prepare_v2(wrapper->conn, "PRAGMA foreign_keys = ON;", -1, &stmt, NULL);
if (sqlite3_step(stmt) != SQLITE_DONE)
goto sqlite_stmt_err;
sqlite3_finalize(stmt);
replicate_statement(wrapper, "PRAGMA foreign_keys = ON;");
return true;
sqlite_stmt_err:
db->error = tal_fmt(db, "%s", sqlite3_errmsg(db->conn));
db->error = tal_fmt(db, "%s", sqlite3_errmsg(wrapper->conn));
sqlite3_finalize(stmt);
return false;
}