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db: Move statement expansion into the driver

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It's better to let the driver decide when and how to expand. It can then
report the expanded statement back to the dispatch through the
`db_changes_add` function.

Signed-off-by: Christian Decker <decker.christian@gmail.com>
This commit is contained in:
Christian Decker
2019-08-28 16:25:42 +02:00
committed by Rusty Russell
parent b6d583c26a
commit 742bcdb2bc
3 changed files with 50 additions and 52 deletions
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37
wallet/db_sqlite3.c
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@@ -7,20 +7,14 @@
#if HAVE_SQLITE3
static const char *db_sqlite3_expand(struct db_stmt *stmt)
#if !HAVE_SQLITE3_EXPANDED_SQL
/* Prior to sqlite3 v3.14, we have to use tracing to dump statements */
static void trace_sqlite3(void *stmtv, const char *stmt)
{
#if HAVE_SQLITE3_EXPANDED_SQL
sqlite3_stmt *s = (sqlite3_stmt*)stmt->inner_stmt;
const char *sql;
char *expanded_sql;
expanded_sql = sqlite3_expanded_sql(s);
sql = tal_strdup(stmt, expanded_sql);
sqlite3_free(expanded_sql);
return sql;
#else
return NULL;
#endif
struct db_stmt = (struct db_stmt*)stmtv;
db_changes_add(stmt, stmt);
}
#endif
static const char *db_sqlite3_fmt_error(struct db_stmt *stmt)
{
@@ -89,6 +83,12 @@ static bool db_sqlite3_query(struct db_stmt *stmt)
static bool db_sqlite3_exec(struct db_stmt *stmt)
{
int err;
#if !HAVE_SQLITE3_EXPANDED_SQL
/* Register the tracing function if we don't have an explicit way of
* expanding the statement. */
sqlite3_trace(db->sql, trace_sqlite3, stmt);
#endif
if (!db_sqlite3_query(stmt)) {
/* If the prepare step caused an error we hand it up. */
return false;
@@ -101,6 +101,18 @@ static bool db_sqlite3_exec(struct db_stmt *stmt)
return false;
}
#if HAVE_SQLITE3_EXPANDED_SQL
/* Manually expand and call the callback */
char *expanded_sql;
expanded_sql = sqlite3_expanded_sql(stmt->inner_stmt);
db_changes_add(stmt, expanded_sql);
sqlite3_free(expanded_sql);
#else
/* Unregister the trace callback to avoid it accessing the potentially
* stale pointer to stmt */
sqlite3_trace(db->sql, NULL, NULL);
#endif
return true;
}
@@ -198,7 +210,6 @@ struct db_config db_sqlite3_config = {
.name = "sqlite3",
.queries = db_sqlite3_queries,
.num_queries = DB_SQLITE3_QUERY_COUNT,
.expand_fn = &db_sqlite3_expand,
.exec_fn = &db_sqlite3_exec,
.query_fn = &db_sqlite3_query,
.step_fn = &db_sqlite3_step,