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MINOR: connection: add helper conn_append_debug_info()

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This function appends to a buffer some information from a connection.
This will be used by traces and possibly some debugging as well. A
frontend/backend/server, transport/control layers, source/destination
ip:port, connection pointer and direction are reported depending on
the available information.
This commit is contained in:
Willy Tarreau 2021-06-16 17:35:20 +02:00
parent b74debd826
commit d943a044aa
2 changed files with 41 additions and 0 deletions
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2
include/haproxy/connection.h
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@ -55,6 +55,8 @@ int make_proxy_line(char *buf, int buf_len, struct server *srv, struct connectio
int make_proxy_line_v1(char *buf, int buf_len, struct sockaddr_storage *src, struct sockaddr_storage *dst);
int make_proxy_line_v2(char *buf, int buf_len, struct server *srv, struct connection *remote, struct stream *strm);
int conn_append_debug_info(struct buffer *buf, const struct connection *conn, const char *pfx);
int conn_subscribe(struct connection *conn, void *xprt_ctx, int event_type, struct wait_event *es);
int conn_unsubscribe(struct connection *conn, void *xprt_ctx, int event_type, struct wait_event *es);

39
src/connection.c
View File

@ -1357,6 +1357,45 @@ static int cfg_parse_pp2_never_send_local(char **args, int section_type, struct
return 0;
}
/* extracts some info from the connection and appends them to buffer <buf>. The
* connection's pointer, its direction, target (fe/be/srv), xprt/ctrl, source
* when set, destination when set, are printed in a compact human-readable format
* fitting on a single line. This is handy to complete traces or debug output.
* It is permitted to pass a NULL conn pointer. The number of characters emitted
* is returned. A prefix <pfx> might be prepended before the first field if not
* NULL.
*/
int conn_append_debug_info(struct buffer *buf, const struct connection *conn, const char *pfx)
{
const struct listener *li;
const struct server *sv;
const struct proxy *px;
char addr[40];
int old_len = buf->data;
if (!conn)
return 0;
chunk_appendf(buf, "%sconn=%p(%s)", pfx ? pfx : "", conn, conn_is_back(conn) ? "OUT" : "IN");
if ((li = objt_listener(conn->target)))
chunk_appendf(buf, " fe=%s", li->bind_conf->frontend->id);
else if ((sv = objt_server(conn->target)))
chunk_appendf(buf, " sv=%s/%s", sv->proxy->id, sv->id);
else if ((px = objt_proxy(conn->target)))
chunk_appendf(buf, " be=%s", px->id);
chunk_appendf(buf, " %s/%s", conn_get_xprt_name(conn), conn_get_ctrl_name(conn));
if (conn->flags & CO_FL_ADDR_FROM_SET && addr_to_str(conn->src, addr, sizeof(addr)))
chunk_appendf(buf, " src=%s:%d", addr, get_host_port(conn->src));
if (conn->flags & CO_FL_ADDR_TO_SET && addr_to_str(conn->dst, addr, sizeof(addr)))
chunk_appendf(buf, " dst=%s:%d", addr, get_host_port(conn->dst));
return buf->data - old_len;
}
/* return the major HTTP version as 1 or 2 depending on how the request arrived
* before being processed.
*