commit 218e84b634d10c25a6d5d002a983ddb051278bdf Author: Nick Mathewson nickm@torproject.org Date: Mon Jul 18 15:38:05 2011 -0400
Remember optimistically sent data until we have gotten a CONNECTED
Since we can retry failed streams under some circumstances, we need to be ready to send data queued on them. --- src/or/connection.c | 7 ++++++- src/or/connection_edge.c | 9 ++++++++- src/or/or.h | 15 ++++++++++++--- src/or/relay.c | 44 ++++++++++++++++++++++++++++++++++++++++++-- 4 files changed, 68 insertions(+), 7 deletions(-)
diff --git a/src/or/connection.c b/src/or/connection.c index 8b9fb12..1ccd2b6 100644 --- a/src/or/connection.c +++ b/src/or/connection.c @@ -444,7 +444,12 @@ _connection_free(connection_t *conn) tor_free(edge_conn->chosen_exit_name); if (edge_conn->socks_request) socks_request_free(edge_conn->socks_request); - + if (edge_conn->pending_optimistic_data) { + generic_buffer_free(edge_conn->pending_optimistic_data); + } + if (edge_conn->sending_optimistic_data) { + generic_buffer_free(edge_conn->sending_optimistic_data); + } rend_data_free(edge_conn->rend_data); } if (conn->type == CONN_TYPE_CONTROL) { diff --git a/src/or/connection_edge.c b/src/or/connection_edge.c index 20f8bc9..79f0db0 100644 --- a/src/or/connection_edge.c +++ b/src/or/connection_edge.c @@ -738,6 +738,12 @@ connection_ap_detach_retriable(edge_connection_t *conn, origin_circuit_t *circ, { control_event_stream_status(conn, STREAM_EVENT_FAILED_RETRIABLE, reason); conn->_base.timestamp_lastread = time(NULL); + + if (conn->pending_optimistic_data) { + generic_buffer_set_to_copy(&conn->sending_optimistic_data, + conn->pending_optimistic_data); + } + if (!get_options()->LeaveStreamsUnattached || conn->use_begindir) { /* If we're attaching streams ourself, or if this connection is * a tunneled directory connection, then just attach it. */ @@ -2429,7 +2435,8 @@ connection_ap_handshake_send_begin(edge_connection_t *ap_conn) control_event_stream_status(ap_conn, STREAM_EVENT_SENT_CONNECT, 0);
/* If there's queued-up data, send it now */ - if (connection_get_inbuf_len(TO_CONN(ap_conn)) && + if ((connection_get_inbuf_len(TO_CONN(ap_conn)) || + ap_conn->sending_optimistic_data) && connection_ap_supports_optimistic_data(ap_conn)) { log_info(LD_APP, "Sending up to %ld bytes of queued-up data", connection_get_inbuf_len(TO_CONN(ap_conn))); diff --git a/src/or/or.h b/src/or/or.h index c784267..7097b5f 100644 --- a/src/or/or.h +++ b/src/or/or.h @@ -1237,11 +1237,20 @@ typedef struct edge_connection_t { * NATd connection */ unsigned int is_transparent_ap:1;
- /** Set if this connection's target exit node allows optimistic data. - * (That is, data sent on this stream before the exit has sent a - * CONNECTED cell.)*/ + /** For AP connections only: Set if this connection's target exit node + * allows optimistic data. (That is, data sent on this stream before + * the exit has sent a CONNECTED cell.)*/ unsigned int exit_allows_optimistic_data : 1;
+ /** For AP connections only: buffer for data that we have sent + * optimistically, which we might need to re-send if we have to + * retry this connection. */ + generic_buffer_t *pending_optimistic_data; + /* For AP connections only: buffer for data that we previously sent + * optimistically which we are currently re-sending as we retry this + * connection. */ + generic_buffer_t *sending_optimistic_data; + /** If this is a DNSPort connection, this field holds the pending DNS * request that we're going to try to answer. */ struct evdns_server_request *dns_server_request; diff --git a/src/or/relay.c b/src/or/relay.c index df6d0a8..3fa31a3 100644 --- a/src/or/relay.c +++ b/src/or/relay.c @@ -944,6 +944,12 @@ connection_edge_process_relay_cell_not_open( break; } } + /* This is definitely a success, so forget about any pending data we + * had sent. */ + if (conn->pending_optimistic_data) { + generic_buffer_free(conn->pending_optimistic_data); + conn->pending_optimistic_data = NULL; + }
/* handle anything that might have queued */ if (connection_edge_package_raw_inbuf(conn, 1, NULL) < 0) { @@ -1343,6 +1349,10 @@ connection_edge_package_raw_inbuf(edge_connection_t *conn, int package_partial, char payload[CELL_PAYLOAD_SIZE]; circuit_t *circ; unsigned domain = conn->cpath_layer ? LD_APP : LD_EXIT; + int sending_from_optimistic = 0; + const int sending_optimistically = + conn->_base.type == CONN_TYPE_AP && + conn->_base.state != AP_CONN_STATE_OPEN;
tor_assert(conn);
@@ -1375,7 +1385,18 @@ connection_edge_package_raw_inbuf(edge_connection_t *conn, int package_partial, return 0; }
- amount_to_process = connection_get_inbuf_len(TO_CONN(conn)); + sending_from_optimistic = conn->sending_optimistic_data != NULL; + + if (PREDICT_UNLIKELY(sending_from_optimistic)) { + amount_to_process = generic_buffer_len(conn->sending_optimistic_data); + if (PREDICT_UNLIKELY(!amount_to_process)) { + log_warn(LD_BUG, "sending_optimistic_data was non-NULL but empty"); + amount_to_process = connection_get_inbuf_len(TO_CONN(conn)); + sending_from_optimistic = 0; + } + } else { + amount_to_process = connection_get_inbuf_len(TO_CONN(conn)); + }
if (!amount_to_process) return 0; @@ -1391,11 +1412,30 @@ connection_edge_package_raw_inbuf(edge_connection_t *conn, int package_partial, stats_n_data_bytes_packaged += length; stats_n_data_cells_packaged += 1;
- connection_fetch_from_buf(payload, length, TO_CONN(conn)); + if (PREDICT_UNLIKELY(sending_from_optimistic)) { + /* XXX023 We could be more efficient here by sometimes packing + * previously-sent optimistic data in the same cell with data + * from the inbuf. */ + generic_buffer_get(conn->sending_optimistic_data, payload, length); + if (!generic_buffer_len(conn->sending_optimistic_data)) { + generic_buffer_free(conn->sending_optimistic_data); + conn->sending_optimistic_data = NULL; + } + } else { + connection_fetch_from_buf(payload, length, TO_CONN(conn)); + }
log_debug(domain,"(%d) Packaging %d bytes (%d waiting).", conn->_base.s, (int)length, (int)connection_get_inbuf_len(TO_CONN(conn)));
+ if (sending_optimistically && !sending_from_optimistic) { + /* This is new optimistic data; remember it in case we need to detach and + retry */ + if (!conn->pending_optimistic_data) + conn->pending_optimistic_data = generic_buffer_new(); + generic_buffer_add(conn->pending_optimistic_data, payload, length); + } + if (connection_edge_send_command(conn, RELAY_COMMAND_DATA, payload, length) < 0 ) /* circuit got marked for close, don't continue, don't need to mark conn */