2 * Copyright (c) 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
24 #include "dynamic-string.h"
25 #include "fatal-signal.h"
29 #include "ovs-thread.h"
30 #include "poll-loop.h"
31 #include "reconnect.h"
36 VLOG_DEFINE_THIS_MODULE(jsonrpc);
39 struct stream *stream;
45 uint8_t input_buffer[512];
46 struct json_parser *parser;
47 struct jsonrpc_msg *received;
50 struct list output; /* Contains "struct ofpbuf"s. */
54 /* Rate limit for error messages. */
55 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 5);
57 static void jsonrpc_received(struct jsonrpc *);
58 static void jsonrpc_cleanup(struct jsonrpc *);
59 static void jsonrpc_error(struct jsonrpc *, int error);
61 /* This is just the same as stream_open() except that it uses the default
62 * JSONRPC port if none is specified. */
64 jsonrpc_stream_open(const char *name, struct stream **streamp, uint8_t dscp)
66 return stream_open_with_default_port(name, OVSDB_OLD_PORT,
70 /* This is just the same as pstream_open() except that it uses the default
71 * JSONRPC port if none is specified. */
73 jsonrpc_pstream_open(const char *name, struct pstream **pstreamp, uint8_t dscp)
75 return pstream_open_with_default_port(name, OVSDB_OLD_PORT,
79 /* Returns a new JSON-RPC stream that uses 'stream' for input and output. The
80 * new jsonrpc object takes ownership of 'stream'. */
82 jsonrpc_open(struct stream *stream)
86 ovs_assert(stream != NULL);
88 rpc = xzalloc(sizeof *rpc);
89 rpc->name = xstrdup(stream_get_name(stream));
91 byteq_init(&rpc->input, rpc->input_buffer, sizeof rpc->input_buffer);
92 list_init(&rpc->output);
97 /* Destroys 'rpc', closing the stream on which it is based, and frees its
100 jsonrpc_close(struct jsonrpc *rpc)
103 jsonrpc_cleanup(rpc);
109 /* Performs periodic maintenance on 'rpc', such as flushing output buffers. */
111 jsonrpc_run(struct jsonrpc *rpc)
117 stream_run(rpc->stream);
118 while (!list_is_empty(&rpc->output)) {
119 struct ofpbuf *buf = ofpbuf_from_list(rpc->output.next);
122 retval = stream_send(rpc->stream, buf->data, buf->size);
124 rpc->backlog -= retval;
125 ofpbuf_pull(buf, retval);
127 list_remove(&buf->list_node);
131 if (retval != -EAGAIN) {
132 VLOG_WARN_RL(&rl, "%s: send error: %s",
133 rpc->name, ovs_strerror(-retval));
134 jsonrpc_error(rpc, -retval);
141 /* Arranges for the poll loop to wake up when 'rpc' needs to perform
142 * maintenance activities. */
144 jsonrpc_wait(struct jsonrpc *rpc)
147 stream_run_wait(rpc->stream);
148 if (!list_is_empty(&rpc->output)) {
149 stream_send_wait(rpc->stream);
155 * Returns the current status of 'rpc'. The possible return values are:
158 * - EOF: end of file (remote end closed connection; not necessarily an error).
160 * When this functions nonzero, 'rpc' is effectively out of commission. 'rpc'
161 * will not receive any more messages and any further messages that one
162 * attempts to send with 'rpc' will be discarded. The caller can keep 'rpc'
163 * around as long as it wants, but it's not going to provide any more useful
167 jsonrpc_get_status(const struct jsonrpc *rpc)
172 /* Returns the number of bytes buffered by 'rpc' to be written to the
173 * underlying stream. Always returns 0 if 'rpc' has encountered an error or if
174 * the remote end closed the connection. */
176 jsonrpc_get_backlog(const struct jsonrpc *rpc)
178 return rpc->status ? 0 : rpc->backlog;
181 /* Returns the number of bytes that have been received on 'rpc''s underlying
182 * stream. (The value wraps around if it exceeds UINT_MAX.) */
184 jsonrpc_get_received_bytes(const struct jsonrpc *rpc)
186 return rpc->input.head;
189 /* Returns 'rpc''s name, that is, the name returned by stream_get_name() for
190 * the stream underlying 'rpc' when 'rpc' was created. */
192 jsonrpc_get_name(const struct jsonrpc *rpc)
198 jsonrpc_log_msg(const struct jsonrpc *rpc, const char *title,
199 const struct jsonrpc_msg *msg)
201 if (VLOG_IS_DBG_ENABLED()) {
202 struct ds s = DS_EMPTY_INITIALIZER;
204 ds_put_format(&s, ", method=\"%s\"", msg->method);
207 ds_put_cstr(&s, ", params=");
208 json_to_ds(msg->params, 0, &s);
211 ds_put_cstr(&s, ", result=");
212 json_to_ds(msg->result, 0, &s);
215 ds_put_cstr(&s, ", error=");
216 json_to_ds(msg->error, 0, &s);
219 ds_put_cstr(&s, ", id=");
220 json_to_ds(msg->id, 0, &s);
222 VLOG_DBG("%s: %s %s%s", rpc->name, title,
223 jsonrpc_msg_type_to_string(msg->type), ds_cstr(&s));
228 /* Schedules 'msg' to be sent on 'rpc' and returns 'rpc''s status (as with
229 * jsonrpc_get_status()).
231 * If 'msg' cannot be sent immediately, it is appended to a buffer. The caller
232 * is responsible for ensuring that the amount of buffered data is somehow
233 * limited. (jsonrpc_get_backlog() returns the amount of data currently
234 * buffered in 'rpc'.)
236 * Always takes ownership of 'msg', regardless of success. */
238 jsonrpc_send(struct jsonrpc *rpc, struct jsonrpc_msg *msg)
246 jsonrpc_msg_destroy(msg);
250 jsonrpc_log_msg(rpc, "send", msg);
252 json = jsonrpc_msg_to_json(msg);
253 s = json_to_string(json, 0);
257 buf = xmalloc(sizeof *buf);
258 ofpbuf_use(buf, s, length);
260 list_push_back(&rpc->output, &buf->list_node);
261 rpc->backlog += length;
263 if (rpc->backlog == length) {
269 /* Attempts to receive a message from 'rpc'.
271 * If successful, stores the received message in '*msgp' and returns 0. The
272 * caller takes ownership of '*msgp' and must eventually destroy it with
273 * jsonrpc_msg_destroy().
275 * Otherwise, stores NULL in '*msgp' and returns one of the following:
277 * - EAGAIN: No message has been received.
279 * - EOF: The remote end closed the connection gracefully.
281 * - Otherwise an errno value that represents a JSON-RPC protocol violation
282 * or another error fatal to the connection. 'rpc' will not send or
283 * receive any more messages.
286 jsonrpc_recv(struct jsonrpc *rpc, struct jsonrpc_msg **msgp)
295 for (i = 0; i < 50; i++) {
297 *msgp = rpc->received;
298 rpc->received = NULL;
300 } else if (byteq_is_empty(&rpc->input)) {
304 chunk = byteq_headroom(&rpc->input);
305 retval = stream_recv(rpc->stream, byteq_head(&rpc->input), chunk);
307 if (retval == -EAGAIN) {
310 VLOG_WARN_RL(&rl, "%s: receive error: %s",
311 rpc->name, ovs_strerror(-retval));
312 jsonrpc_error(rpc, -retval);
315 } else if (retval == 0) {
316 jsonrpc_error(rpc, EOF);
319 byteq_advance_head(&rpc->input, retval);
324 rpc->parser = json_parser_create(0);
326 n = byteq_tailroom(&rpc->input);
327 used = json_parser_feed(rpc->parser,
328 (char *) byteq_tail(&rpc->input), n);
329 byteq_advance_tail(&rpc->input, used);
330 if (json_parser_is_done(rpc->parser)) {
331 jsonrpc_received(rpc);
333 const struct byteq *q = &rpc->input;
334 if (q->head <= q->size) {
335 stream_report_content(q->buffer, q->head,
337 THIS_MODULE, rpc->name);
348 /* Causes the poll loop to wake up when jsonrpc_recv() may return a value other
351 jsonrpc_recv_wait(struct jsonrpc *rpc)
353 if (rpc->status || rpc->received || !byteq_is_empty(&rpc->input)) {
354 poll_immediate_wake_at(rpc->name);
356 stream_recv_wait(rpc->stream);
360 /* Sends 'msg' on 'rpc' and waits for it to be successfully queued to the
361 * underlying stream. Returns 0 if 'msg' was sent successfully, otherwise a
362 * status value (see jsonrpc_get_status()).
364 * Always takes ownership of 'msg', regardless of success. */
366 jsonrpc_send_block(struct jsonrpc *rpc, struct jsonrpc_msg *msg)
372 error = jsonrpc_send(rpc, msg);
379 if (list_is_empty(&rpc->output) || rpc->status) {
387 /* Waits for a message to be received on 'rpc'. Same semantics as
388 * jsonrpc_recv() except that EAGAIN will never be returned. */
390 jsonrpc_recv_block(struct jsonrpc *rpc, struct jsonrpc_msg **msgp)
393 int error = jsonrpc_recv(rpc, msgp);
394 if (error != EAGAIN) {
401 jsonrpc_recv_wait(rpc);
406 /* Sends 'request' to 'rpc' then waits for a reply. The return value is 0 if
407 * successful, in which case '*replyp' is set to the reply, which the caller
408 * must eventually free with jsonrpc_msg_destroy(). Otherwise returns a status
409 * value (see jsonrpc_get_status()).
411 * Discards any message received on 'rpc' that is not a reply to 'request'
412 * (based on message id).
414 * Always takes ownership of 'request', regardless of success. */
416 jsonrpc_transact_block(struct jsonrpc *rpc, struct jsonrpc_msg *request,
417 struct jsonrpc_msg **replyp)
419 struct jsonrpc_msg *reply = NULL;
423 id = json_clone(request->id);
424 error = jsonrpc_send_block(rpc, request);
427 error = jsonrpc_recv_block(rpc, &reply);
431 if ((reply->type == JSONRPC_REPLY || reply->type == JSONRPC_ERROR)
432 && json_equal(id, reply->id)) {
435 jsonrpc_msg_destroy(reply);
438 *replyp = error ? NULL : reply;
444 jsonrpc_received(struct jsonrpc *rpc)
446 struct jsonrpc_msg *msg;
450 json = json_parser_finish(rpc->parser);
452 if (json->type == JSON_STRING) {
453 VLOG_WARN_RL(&rl, "%s: error parsing stream: %s",
454 rpc->name, json_string(json));
455 jsonrpc_error(rpc, EPROTO);
460 error = jsonrpc_msg_from_json(json, &msg);
462 VLOG_WARN_RL(&rl, "%s: received bad JSON-RPC message: %s",
465 jsonrpc_error(rpc, EPROTO);
469 jsonrpc_log_msg(rpc, "received", msg);
474 jsonrpc_error(struct jsonrpc *rpc, int error)
479 jsonrpc_cleanup(rpc);
484 jsonrpc_cleanup(struct jsonrpc *rpc)
486 stream_close(rpc->stream);
489 json_parser_abort(rpc->parser);
492 jsonrpc_msg_destroy(rpc->received);
493 rpc->received = NULL;
495 ofpbuf_list_delete(&rpc->output);
499 static struct jsonrpc_msg *
500 jsonrpc_create(enum jsonrpc_msg_type type, const char *method,
501 struct json *params, struct json *result, struct json *error,
504 struct jsonrpc_msg *msg = xmalloc(sizeof *msg);
506 msg->method = method ? xstrdup(method) : NULL;
507 msg->params = params;
508 msg->result = result;
515 jsonrpc_create_id(void)
517 static atomic_uint next_id = ATOMIC_VAR_INIT(0);
520 atomic_add(&next_id, 1, &id);
521 return json_integer_create(id);
525 jsonrpc_create_request(const char *method, struct json *params,
528 struct json *id = jsonrpc_create_id();
530 *idp = json_clone(id);
532 return jsonrpc_create(JSONRPC_REQUEST, method, params, NULL, NULL, id);
536 jsonrpc_create_notify(const char *method, struct json *params)
538 return jsonrpc_create(JSONRPC_NOTIFY, method, params, NULL, NULL, NULL);
542 jsonrpc_create_reply(struct json *result, const struct json *id)
544 return jsonrpc_create(JSONRPC_REPLY, NULL, NULL, result, NULL,
549 jsonrpc_create_error(struct json *error, const struct json *id)
551 return jsonrpc_create(JSONRPC_REPLY, NULL, NULL, NULL, error,
556 jsonrpc_msg_type_to_string(enum jsonrpc_msg_type type)
559 case JSONRPC_REQUEST:
563 return "notification";
575 jsonrpc_msg_is_valid(const struct jsonrpc_msg *m)
577 const char *type_name;
578 unsigned int pattern;
580 if (m->params && m->params->type != JSON_ARRAY) {
581 return xstrdup("\"params\" must be JSON array");
585 case JSONRPC_REQUEST:
602 return xasprintf("invalid JSON-RPC message type %d", m->type);
605 type_name = jsonrpc_msg_type_to_string(m->type);
606 if ((m->method != NULL) != ((pattern & 0x10000) != 0)) {
607 return xasprintf("%s must%s have \"method\"",
608 type_name, (pattern & 0x10000) ? "" : " not");
611 if ((m->params != NULL) != ((pattern & 0x1000) != 0)) {
612 return xasprintf("%s must%s have \"params\"",
613 type_name, (pattern & 0x1000) ? "" : " not");
616 if ((m->result != NULL) != ((pattern & 0x100) != 0)) {
617 return xasprintf("%s must%s have \"result\"",
618 type_name, (pattern & 0x100) ? "" : " not");
621 if ((m->error != NULL) != ((pattern & 0x10) != 0)) {
622 return xasprintf("%s must%s have \"error\"",
623 type_name, (pattern & 0x10) ? "" : " not");
626 if ((m->id != NULL) != ((pattern & 0x1) != 0)) {
627 return xasprintf("%s must%s have \"id\"",
628 type_name, (pattern & 0x1) ? "" : " not");
635 jsonrpc_msg_destroy(struct jsonrpc_msg *m)
639 json_destroy(m->params);
640 json_destroy(m->result);
641 json_destroy(m->error);
648 null_from_json_null(struct json *json)
650 if (json && json->type == JSON_NULL) {
658 jsonrpc_msg_from_json(struct json *json, struct jsonrpc_msg **msgp)
660 struct json *method = NULL;
661 struct jsonrpc_msg *msg = NULL;
662 struct shash *object;
665 if (json->type != JSON_OBJECT) {
666 error = xstrdup("message is not a JSON object");
669 object = json_object(json);
671 method = shash_find_and_delete(object, "method");
672 if (method && method->type != JSON_STRING) {
673 error = xstrdup("method is not a JSON string");
677 msg = xzalloc(sizeof *msg);
678 msg->method = method ? xstrdup(method->u.string) : NULL;
679 msg->params = null_from_json_null(shash_find_and_delete(object, "params"));
680 msg->result = null_from_json_null(shash_find_and_delete(object, "result"));
681 msg->error = null_from_json_null(shash_find_and_delete(object, "error"));
682 msg->id = null_from_json_null(shash_find_and_delete(object, "id"));
683 msg->type = (msg->result ? JSONRPC_REPLY
684 : msg->error ? JSONRPC_ERROR
685 : msg->id ? JSONRPC_REQUEST
687 if (!shash_is_empty(object)) {
688 error = xasprintf("message has unexpected member \"%s\"",
689 shash_first(object)->name);
692 error = jsonrpc_msg_is_valid(msg);
698 json_destroy(method);
701 jsonrpc_msg_destroy(msg);
709 jsonrpc_msg_to_json(struct jsonrpc_msg *m)
711 struct json *json = json_object_create();
714 json_object_put(json, "method", json_string_create_nocopy(m->method));
718 json_object_put(json, "params", m->params);
722 json_object_put(json, "result", m->result);
723 } else if (m->type == JSONRPC_ERROR) {
724 json_object_put(json, "result", json_null_create());
728 json_object_put(json, "error", m->error);
729 } else if (m->type == JSONRPC_REPLY) {
730 json_object_put(json, "error", json_null_create());
734 json_object_put(json, "id", m->id);
735 } else if (m->type == JSONRPC_NOTIFY) {
736 json_object_put(json, "id", json_null_create());
744 /* A JSON-RPC session with reconnection. */
746 struct jsonrpc_session {
747 struct reconnect *reconnect;
749 struct stream *stream;
750 struct pstream *pstream;
756 /* Creates and returns a jsonrpc_session to 'name', which should be a string
757 * acceptable to stream_open() or pstream_open().
759 * If 'name' is an active connection method, e.g. "tcp:127.1.2.3", the new
760 * jsonrpc_session connects to 'name'. If 'retry' is true, then the new
761 * session connects and reconnects to 'name', with backoff. If 'retry' is
762 * false, the new session will only try to connect once and after a connection
763 * failure or a disconnection jsonrpc_session_is_alive() will return false for
766 * If 'name' is a passive connection method, e.g. "ptcp:", the new
767 * jsonrpc_session listens for connections to 'name'. It maintains at most one
768 * connection at any given time. Any new connection causes the previous one
769 * (if any) to be dropped. */
770 struct jsonrpc_session *
771 jsonrpc_session_open(const char *name, bool retry)
773 struct jsonrpc_session *s;
775 s = xmalloc(sizeof *s);
776 s->reconnect = reconnect_create(time_msec());
777 reconnect_set_name(s->reconnect, name);
778 reconnect_enable(s->reconnect, time_msec());
786 if (!pstream_verify_name(name)) {
787 reconnect_set_passive(s->reconnect, true, time_msec());
789 reconnect_set_max_tries(s->reconnect, 1);
790 reconnect_set_backoff(s->reconnect, INT_MAX, INT_MAX);
793 if (!stream_or_pstream_needs_probes(name)) {
794 reconnect_set_probe_interval(s->reconnect, 0);
800 /* Creates and returns a jsonrpc_session that is initially connected to
801 * 'jsonrpc'. If the connection is dropped, it will not be reconnected.
803 * On the assumption that such connections are likely to be short-lived
804 * (e.g. from ovs-vsctl), informational logging for them is suppressed. */
805 struct jsonrpc_session *
806 jsonrpc_session_open_unreliably(struct jsonrpc *jsonrpc, uint8_t dscp)
808 struct jsonrpc_session *s;
810 s = xmalloc(sizeof *s);
811 s->reconnect = reconnect_create(time_msec());
812 reconnect_set_quiet(s->reconnect, true);
813 reconnect_set_name(s->reconnect, jsonrpc_get_name(jsonrpc));
814 reconnect_set_max_tries(s->reconnect, 0);
815 reconnect_connected(s->reconnect, time_msec());
826 jsonrpc_session_close(struct jsonrpc_session *s)
829 jsonrpc_close(s->rpc);
830 reconnect_destroy(s->reconnect);
831 stream_close(s->stream);
832 pstream_close(s->pstream);
838 jsonrpc_session_disconnect(struct jsonrpc_session *s)
841 jsonrpc_error(s->rpc, EOF);
842 jsonrpc_close(s->rpc);
845 } else if (s->stream) {
846 stream_close(s->stream);
853 jsonrpc_session_connect(struct jsonrpc_session *s)
855 const char *name = reconnect_get_name(s->reconnect);
858 jsonrpc_session_disconnect(s);
859 if (!reconnect_is_passive(s->reconnect)) {
860 error = jsonrpc_stream_open(name, &s->stream, s->dscp);
862 reconnect_connecting(s->reconnect, time_msec());
864 s->last_error = error;
867 error = s->pstream ? 0 : jsonrpc_pstream_open(name, &s->pstream,
870 reconnect_listening(s->reconnect, time_msec());
875 reconnect_connect_failed(s->reconnect, time_msec(), error);
881 jsonrpc_session_run(struct jsonrpc_session *s)
884 struct stream *stream;
887 error = pstream_accept(s->pstream, &stream);
889 if (s->rpc || s->stream) {
891 "%s: new connection replacing active connection",
892 reconnect_get_name(s->reconnect));
893 jsonrpc_session_disconnect(s);
895 reconnect_connected(s->reconnect, time_msec());
896 s->rpc = jsonrpc_open(stream);
897 } else if (error != EAGAIN) {
898 reconnect_listen_error(s->reconnect, time_msec(), error);
899 pstream_close(s->pstream);
908 backlog = jsonrpc_get_backlog(s->rpc);
910 if (jsonrpc_get_backlog(s->rpc) < backlog) {
911 /* Data previously caught in a queue was successfully sent (or
912 * there's an error, which we'll catch below.)
914 * We don't count data that is successfully sent immediately as
915 * activity, because there's a lot of queuing downstream from us,
916 * which means that we can push a lot of data into a connection
917 * that has stalled and won't ever recover.
919 reconnect_activity(s->reconnect, time_msec());
922 error = jsonrpc_get_status(s->rpc);
924 reconnect_disconnected(s->reconnect, time_msec(), error);
925 jsonrpc_session_disconnect(s);
926 s->last_error = error;
928 } else if (s->stream) {
931 stream_run(s->stream);
932 error = stream_connect(s->stream);
934 reconnect_connected(s->reconnect, time_msec());
935 s->rpc = jsonrpc_open(s->stream);
937 } else if (error != EAGAIN) {
938 reconnect_connect_failed(s->reconnect, time_msec(), error);
939 stream_close(s->stream);
944 switch (reconnect_run(s->reconnect, time_msec())) {
945 case RECONNECT_CONNECT:
946 jsonrpc_session_connect(s);
949 case RECONNECT_DISCONNECT:
950 reconnect_disconnected(s->reconnect, time_msec(), 0);
951 jsonrpc_session_disconnect(s);
954 case RECONNECT_PROBE:
957 struct jsonrpc_msg *request;
959 params = json_array_create_empty();
960 request = jsonrpc_create_request("echo", params, NULL);
961 json_destroy(request->id);
962 request->id = json_string_create("echo");
963 jsonrpc_send(s->rpc, request);
970 jsonrpc_session_wait(struct jsonrpc_session *s)
973 jsonrpc_wait(s->rpc);
974 } else if (s->stream) {
975 stream_run_wait(s->stream);
976 stream_connect_wait(s->stream);
979 pstream_wait(s->pstream);
981 reconnect_wait(s->reconnect, time_msec());
985 jsonrpc_session_get_backlog(const struct jsonrpc_session *s)
987 return s->rpc ? jsonrpc_get_backlog(s->rpc) : 0;
990 /* Always returns a pointer to a valid C string, assuming 's' was initialized
993 jsonrpc_session_get_name(const struct jsonrpc_session *s)
995 return reconnect_get_name(s->reconnect);
998 /* Always takes ownership of 'msg', regardless of success. */
1000 jsonrpc_session_send(struct jsonrpc_session *s, struct jsonrpc_msg *msg)
1003 return jsonrpc_send(s->rpc, msg);
1005 jsonrpc_msg_destroy(msg);
1010 struct jsonrpc_msg *
1011 jsonrpc_session_recv(struct jsonrpc_session *s)
1014 unsigned int received_bytes;
1015 struct jsonrpc_msg *msg;
1017 received_bytes = jsonrpc_get_received_bytes(s->rpc);
1018 jsonrpc_recv(s->rpc, &msg);
1019 if (received_bytes != jsonrpc_get_received_bytes(s->rpc)) {
1020 /* Data was successfully received.
1022 * Previously we only counted receiving a full message as activity,
1023 * but with large messages or a slow connection that policy could
1024 * time out the session mid-message. */
1025 reconnect_activity(s->reconnect, time_msec());
1029 if (msg->type == JSONRPC_REQUEST && !strcmp(msg->method, "echo")) {
1030 /* Echo request. Send reply. */
1031 struct jsonrpc_msg *reply;
1033 reply = jsonrpc_create_reply(json_clone(msg->params), msg->id);
1034 jsonrpc_session_send(s, reply);
1035 } else if (msg->type == JSONRPC_REPLY
1036 && msg->id && msg->id->type == JSON_STRING
1037 && !strcmp(msg->id->u.string, "echo")) {
1038 /* It's a reply to our echo request. Suppress it. */
1042 jsonrpc_msg_destroy(msg);
1049 jsonrpc_session_recv_wait(struct jsonrpc_session *s)
1052 jsonrpc_recv_wait(s->rpc);
1057 jsonrpc_session_is_alive(const struct jsonrpc_session *s)
1059 return s->rpc || s->stream || reconnect_get_max_tries(s->reconnect);
1063 jsonrpc_session_is_connected(const struct jsonrpc_session *s)
1065 return s->rpc != NULL;
1069 jsonrpc_session_get_seqno(const struct jsonrpc_session *s)
1075 jsonrpc_session_get_status(const struct jsonrpc_session *s)
1077 return s && s->rpc ? jsonrpc_get_status(s->rpc) : 0;
1081 jsonrpc_session_get_last_error(const struct jsonrpc_session *s)
1083 return s->last_error;
1087 jsonrpc_session_get_reconnect_stats(const struct jsonrpc_session *s,
1088 struct reconnect_stats *stats)
1090 reconnect_get_stats(s->reconnect, time_msec(), stats);
1094 jsonrpc_session_force_reconnect(struct jsonrpc_session *s)
1096 reconnect_force_reconnect(s->reconnect, time_msec());
1100 jsonrpc_session_set_max_backoff(struct jsonrpc_session *s, int max_backoff)
1102 reconnect_set_backoff(s->reconnect, 0, max_backoff);
1106 jsonrpc_session_set_probe_interval(struct jsonrpc_session *s,
1109 reconnect_set_probe_interval(s->reconnect, probe_interval);
1113 jsonrpc_session_set_dscp(struct jsonrpc_session *s,
1116 if (s->dscp != dscp) {
1120 error = pstream_set_dscp(s->pstream, dscp);
1122 VLOG_ERR("%s: failed set_dscp %s",
1123 reconnect_get_name(s->reconnect),
1124 ovs_strerror(error));
1127 * XXX race window between setting dscp to listening socket
1128 * and accepting socket. accepted socket may have old dscp value.
1129 * Ignore this race window for now.
1133 jsonrpc_session_force_reconnect(s);