Rewrite SQL configuration support.

Multiple configurations can be provided, by calling dbrw.config from
branches of a conditional VCL statement.  The only requirement is that
exactly one dbrw.config is executed within a single HTTP session.  This
allows the user to select rewrite data from various databases depending
on some conditions.

Open SQL connections are stored in a pool and reused as needed.  So far
no limit on the number of connections is imposed.  This is a TODO.

Connections remain open during the lifetime of the module (i.e. for as
long as varnish is not restarted).

* src/dbrw.h (dbrw_config): New members: param_str, magic and list.
(dbrw_connection): New members: magic, busy, list.
* src/vmod_dbrw.c (dbrw_connection_get)
(dbrw_connection_release): New functions.
(dbrw_event): Install atexit function.
(vmod_config): Keep a pool of configurations.
(dbrw_sethdr) [VARNISHVERSION]: Remove leftover code.
(vmod_rewrite): Rewrite.
* src/vmod_dbrw.vcc (config, rewrite): Mark as PRIV_TASK.

* doc/vmod-dbrw.3: Update docs.
* doc/vmod-dbrw.texi: Update docs.

* configure.ac: Raise version number

1 files changed, 1 insertions, 0 deletions

diff --git a/src/sql.c b/src/sql.c
index b9ba3a4..c42c5de 100644
--- a/src/sql.c
+++ b/src/sql.c
@@ -184,3 +184,4 @@ sql_get_column(struct dbrw_connection *conn, unsigned row, unsigned col)
 		return NULL;
 	return conn->conf->backend->sql_get_column(conn, row, col);
 }
+