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 ports if none is specified. */
64 jsonrpc_stream_open(const char *name, struct stream **streamp, uint8_t dscp)
66 return stream_open_with_default_ports(name, JSONRPC_TCP_PORT,
67 JSONRPC_SSL_PORT, streamp,
71 /* This is just the same as pstream_open() except that it uses the default
72 * JSONRPC ports if none is specified. */
74 jsonrpc_pstream_open(const char *name, struct pstream **pstreamp, uint8_t dscp)
76 return pstream_open_with_default_ports(name, JSONRPC_TCP_PORT,
77 JSONRPC_SSL_PORT, pstreamp, dscp);
80 /* Returns a new JSON-RPC stream that uses 'stream' for input and output. The
81 * new jsonrpc object takes ownership of 'stream'. */
83 jsonrpc_open(struct stream *stream)
87 ovs_assert(stream != NULL);
89 rpc = xzalloc(sizeof *rpc);
90 rpc->name = xstrdup(stream_get_name(stream));
92 byteq_init(&rpc->input, rpc->input_buffer, sizeof rpc->input_buffer);
93 list_init(&rpc->output);
98 /* Destroys 'rpc', closing the stream on which it is based, and frees its
101 jsonrpc_close(struct jsonrpc *rpc)
104 jsonrpc_cleanup(rpc);
110 /* Performs periodic maintenance on 'rpc', such as flushing output buffers. */
112 jsonrpc_run(struct jsonrpc *rpc)
118 stream_run(rpc->stream);
119 while (!list_is_empty(&rpc->output)) {
120 struct ofpbuf *buf = ofpbuf_from_list(rpc->output.next);
123 retval = stream_send(rpc->stream, buf->data, buf->size);
125 rpc->backlog -= retval;
126 ofpbuf_pull(buf, retval);
128 list_remove(&buf->list_node);
132 if (retval != -EAGAIN) {
133 VLOG_WARN_RL(&rl, "%s: send error: %s",
134 rpc->name, ovs_strerror(-retval));
135 jsonrpc_error(rpc, -retval);
142 /* Arranges for the poll loop to wake up when 'rpc' needs to perform
143 * maintenance activities. */
145 jsonrpc_wait(struct jsonrpc *rpc)
148 stream_run_wait(rpc->stream);
149 if (!list_is_empty(&rpc->output)) {
150 stream_send_wait(rpc->stream);
156 * Returns the current status of 'rpc'. The possible return values are:
159 * - EOF: end of file (remote end closed connection; not necessarily an error).
161 * When this functions nonzero, 'rpc' is effectively out of commission. 'rpc'
162 * will not receive any more messages and any further messages that one
163 * attempts to send with 'rpc' will be discarded. The caller can keep 'rpc'
164 * around as long as it wants, but it's not going to provide any more useful
168 jsonrpc_get_status(const struct jsonrpc *rpc)
173 /* Returns the number of bytes buffered by 'rpc' to be written to the
174 * underlying stream. Always returns 0 if 'rpc' has encountered an error or if
175 * the remote end closed the connection. */
177 jsonrpc_get_backlog(const struct jsonrpc *rpc)
179 return rpc->status ? 0 : rpc->backlog;
182 /* Returns the number of bytes that have been received on 'rpc''s underlying
183 * stream. (The value wraps around if it exceeds UINT_MAX.) */
185 jsonrpc_get_received_bytes(const struct jsonrpc *rpc)
187 return rpc->input.head;
190 /* Returns 'rpc''s name, that is, the name returned by stream_get_name() for
191 * the stream underlying 'rpc' when 'rpc' was created. */
193 jsonrpc_get_name(const struct jsonrpc *rpc)
199 jsonrpc_log_msg(const struct jsonrpc *rpc, const char *title,
200 const struct jsonrpc_msg *msg)
202 if (VLOG_IS_DBG_ENABLED()) {
203 struct ds s = DS_EMPTY_INITIALIZER;
205 ds_put_format(&s, ", method=\"%s\"", msg->method);
208 ds_put_cstr(&s, ", params=");
209 json_to_ds(msg->params, 0, &s);
212 ds_put_cstr(&s, ", result=");
213 json_to_ds(msg->result, 0, &s);
216 ds_put_cstr(&s, ", error=");
217 json_to_ds(msg->error, 0, &s);
220 ds_put_cstr(&s, ", id=");
221 json_to_ds(msg->id, 0, &s);
223 VLOG_DBG("%s: %s %s%s", rpc->name, title,
224 jsonrpc_msg_type_to_string(msg->type), ds_cstr(&s));
229 /* Schedules 'msg' to be sent on 'rpc' and returns 'rpc''s status (as with
230 * jsonrpc_get_status()).
232 * If 'msg' cannot be sent immediately, it is appended to a buffer. The caller
233 * is responsible for ensuring that the amount of buffered data is somehow
234 * limited. (jsonrpc_get_backlog() returns the amount of data currently
235 * buffered in 'rpc'.)
237 * Always takes ownership of 'msg', regardless of success. */
239 jsonrpc_send(struct jsonrpc *rpc, struct jsonrpc_msg *msg)
247 jsonrpc_msg_destroy(msg);
251 jsonrpc_log_msg(rpc, "send", msg);
253 json = jsonrpc_msg_to_json(msg);
254 s = json_to_string(json, 0);
258 buf = xmalloc(sizeof *buf);
259 ofpbuf_use(buf, s, length);
261 list_push_back(&rpc->output, &buf->list_node);
262 rpc->backlog += length;
264 if (rpc->backlog == length) {
270 /* Attempts to receive a message from 'rpc'.
272 * If successful, stores the received message in '*msgp' and returns 0. The
273 * caller takes ownership of '*msgp' and must eventually destroy it with
274 * jsonrpc_msg_destroy().
276 * Otherwise, stores NULL in '*msgp' and returns one of the following:
278 * - EAGAIN: No message has been received.
280 * - EOF: The remote end closed the connection gracefully.
282 * - Otherwise an errno value that represents a JSON-RPC protocol violation
283 * or another error fatal to the connection. 'rpc' will not send or
284 * receive any more messages.
287 jsonrpc_recv(struct jsonrpc *rpc, struct jsonrpc_msg **msgp)
296 for (i = 0; i < 50; i++) {
298 *msgp = rpc->received;
299 rpc->received = NULL;
301 } else if (byteq_is_empty(&rpc->input)) {
305 chunk = byteq_headroom(&rpc->input);
306 retval = stream_recv(rpc->stream, byteq_head(&rpc->input), chunk);
308 if (retval == -EAGAIN) {
311 VLOG_WARN_RL(&rl, "%s: receive error: %s",
312 rpc->name, ovs_strerror(-retval));
313 jsonrpc_error(rpc, -retval);
316 } else if (retval == 0) {
317 jsonrpc_error(rpc, EOF);
320 byteq_advance_head(&rpc->input, retval);
325 rpc->parser = json_parser_create(0);
327 n = byteq_tailroom(&rpc->input);
328 used = json_parser_feed(rpc->parser,
329 (char *) byteq_tail(&rpc->input), n);
330 byteq_advance_tail(&rpc->input, used);
331 if (json_parser_is_done(rpc->parser)) {
332 jsonrpc_received(rpc);
334 const struct byteq *q = &rpc->input;
335 if (q->head <= q->size) {
336 stream_report_content(q->buffer, q->head,
338 THIS_MODULE, rpc->name);
349 /* Causes the poll loop to wake up when jsonrpc_recv() may return a value other
352 jsonrpc_recv_wait(struct jsonrpc *rpc)
354 if (rpc->status || rpc->received || !byteq_is_empty(&rpc->input)) {
355 (poll_immediate_wake)(rpc->name);
357 stream_recv_wait(rpc->stream);
361 /* Sends 'msg' on 'rpc' and waits for it to be successfully queued to the
362 * underlying stream. Returns 0 if 'msg' was sent successfully, otherwise a
363 * status value (see jsonrpc_get_status()).
365 * Always takes ownership of 'msg', regardless of success. */
367 jsonrpc_send_block(struct jsonrpc *rpc, struct jsonrpc_msg *msg)
373 error = jsonrpc_send(rpc, msg);
380 if (list_is_empty(&rpc->output) || rpc->status) {
388 /* Waits for a message to be received on 'rpc'. Same semantics as
389 * jsonrpc_recv() except that EAGAIN will never be returned. */
391 jsonrpc_recv_block(struct jsonrpc *rpc, struct jsonrpc_msg **msgp)
394 int error = jsonrpc_recv(rpc, msgp);
395 if (error != EAGAIN) {
402 jsonrpc_recv_wait(rpc);
407 /* Sends 'request' to 'rpc' then waits for a reply. The return value is 0 if
408 * successful, in which case '*replyp' is set to the reply, which the caller
409 * must eventually free with jsonrpc_msg_destroy(). Otherwise returns a status
410 * value (see jsonrpc_get_status()).
412 * Discards any message received on 'rpc' that is not a reply to 'request'
413 * (based on message id).
415 * Always takes ownership of 'request', regardless of success. */
417 jsonrpc_transact_block(struct jsonrpc *rpc, struct jsonrpc_msg *request,
418 struct jsonrpc_msg **replyp)
420 struct jsonrpc_msg *reply = NULL;
424 id = json_clone(request->id);
425 error = jsonrpc_send_block(rpc, request);
428 error = jsonrpc_recv_block(rpc, &reply);
432 if ((reply->type == JSONRPC_REPLY || reply->type == JSONRPC_ERROR)
433 && json_equal(id, reply->id)) {
436 jsonrpc_msg_destroy(reply);
439 *replyp = error ? NULL : reply;
445 jsonrpc_received(struct jsonrpc *rpc)
447 struct jsonrpc_msg *msg;
451 json = json_parser_finish(rpc->parser);
453 if (json->type == JSON_STRING) {
454 VLOG_WARN_RL(&rl, "%s: error parsing stream: %s",
455 rpc->name, json_string(json));
456 jsonrpc_error(rpc, EPROTO);
461 error = jsonrpc_msg_from_json(json, &msg);
463 VLOG_WARN_RL(&rl, "%s: received bad JSON-RPC message: %s",
466 jsonrpc_error(rpc, EPROTO);
470 jsonrpc_log_msg(rpc, "received", msg);
475 jsonrpc_error(struct jsonrpc *rpc, int error)
480 jsonrpc_cleanup(rpc);
485 jsonrpc_cleanup(struct jsonrpc *rpc)
487 stream_close(rpc->stream);
490 json_parser_abort(rpc->parser);
493 jsonrpc_msg_destroy(rpc->received);
494 rpc->received = NULL;
496 ofpbuf_list_delete(&rpc->output);
500 static struct jsonrpc_msg *
501 jsonrpc_create(enum jsonrpc_msg_type type, const char *method,
502 struct json *params, struct json *result, struct json *error,
505 struct jsonrpc_msg *msg = xmalloc(sizeof *msg);
507 msg->method = method ? xstrdup(method) : NULL;
508 msg->params = params;
509 msg->result = result;
516 jsonrpc_create_id(void)
518 static pthread_mutex_t mutex = PTHREAD_ADAPTIVE_MUTEX_INITIALIZER;
519 static unsigned int next_id;
522 xpthread_mutex_lock(&mutex);
524 xpthread_mutex_unlock(&mutex);
526 return json_integer_create(id);
530 jsonrpc_create_request(const char *method, struct json *params,
533 struct json *id = jsonrpc_create_id();
535 *idp = json_clone(id);
537 return jsonrpc_create(JSONRPC_REQUEST, method, params, NULL, NULL, id);
541 jsonrpc_create_notify(const char *method, struct json *params)
543 return jsonrpc_create(JSONRPC_NOTIFY, method, params, NULL, NULL, NULL);
547 jsonrpc_create_reply(struct json *result, const struct json *id)
549 return jsonrpc_create(JSONRPC_REPLY, NULL, NULL, result, NULL,
554 jsonrpc_create_error(struct json *error, const struct json *id)
556 return jsonrpc_create(JSONRPC_REPLY, NULL, NULL, NULL, error,
561 jsonrpc_msg_type_to_string(enum jsonrpc_msg_type type)
564 case JSONRPC_REQUEST:
568 return "notification";
580 jsonrpc_msg_is_valid(const struct jsonrpc_msg *m)
582 const char *type_name;
583 unsigned int pattern;
585 if (m->params && m->params->type != JSON_ARRAY) {
586 return xstrdup("\"params\" must be JSON array");
590 case JSONRPC_REQUEST:
607 return xasprintf("invalid JSON-RPC message type %d", m->type);
610 type_name = jsonrpc_msg_type_to_string(m->type);
611 if ((m->method != NULL) != ((pattern & 0x10000) != 0)) {
612 return xasprintf("%s must%s have \"method\"",
613 type_name, (pattern & 0x10000) ? "" : " not");
616 if ((m->params != NULL) != ((pattern & 0x1000) != 0)) {
617 return xasprintf("%s must%s have \"params\"",
618 type_name, (pattern & 0x1000) ? "" : " not");
621 if ((m->result != NULL) != ((pattern & 0x100) != 0)) {
622 return xasprintf("%s must%s have \"result\"",
623 type_name, (pattern & 0x100) ? "" : " not");
626 if ((m->error != NULL) != ((pattern & 0x10) != 0)) {
627 return xasprintf("%s must%s have \"error\"",
628 type_name, (pattern & 0x10) ? "" : " not");
631 if ((m->id != NULL) != ((pattern & 0x1) != 0)) {
632 return xasprintf("%s must%s have \"id\"",
633 type_name, (pattern & 0x1) ? "" : " not");
640 jsonrpc_msg_destroy(struct jsonrpc_msg *m)
644 json_destroy(m->params);
645 json_destroy(m->result);
646 json_destroy(m->error);
653 null_from_json_null(struct json *json)
655 if (json && json->type == JSON_NULL) {
663 jsonrpc_msg_from_json(struct json *json, struct jsonrpc_msg **msgp)
665 struct json *method = NULL;
666 struct jsonrpc_msg *msg = NULL;
667 struct shash *object;
670 if (json->type != JSON_OBJECT) {
671 error = xstrdup("message is not a JSON object");
674 object = json_object(json);
676 method = shash_find_and_delete(object, "method");
677 if (method && method->type != JSON_STRING) {
678 error = xstrdup("method is not a JSON string");
682 msg = xzalloc(sizeof *msg);
683 msg->method = method ? xstrdup(method->u.string) : NULL;
684 msg->params = null_from_json_null(shash_find_and_delete(object, "params"));
685 msg->result = null_from_json_null(shash_find_and_delete(object, "result"));
686 msg->error = null_from_json_null(shash_find_and_delete(object, "error"));
687 msg->id = null_from_json_null(shash_find_and_delete(object, "id"));
688 msg->type = (msg->result ? JSONRPC_REPLY
689 : msg->error ? JSONRPC_ERROR
690 : msg->id ? JSONRPC_REQUEST
692 if (!shash_is_empty(object)) {
693 error = xasprintf("message has unexpected member \"%s\"",
694 shash_first(object)->name);
697 error = jsonrpc_msg_is_valid(msg);
703 json_destroy(method);
706 jsonrpc_msg_destroy(msg);
714 jsonrpc_msg_to_json(struct jsonrpc_msg *m)
716 struct json *json = json_object_create();
719 json_object_put(json, "method", json_string_create_nocopy(m->method));
723 json_object_put(json, "params", m->params);
727 json_object_put(json, "result", m->result);
728 } else if (m->type == JSONRPC_ERROR) {
729 json_object_put(json, "result", json_null_create());
733 json_object_put(json, "error", m->error);
734 } else if (m->type == JSONRPC_REPLY) {
735 json_object_put(json, "error", json_null_create());
739 json_object_put(json, "id", m->id);
740 } else if (m->type == JSONRPC_NOTIFY) {
741 json_object_put(json, "id", json_null_create());
749 /* A JSON-RPC session with reconnection. */
751 struct jsonrpc_session {
752 struct reconnect *reconnect;
754 struct stream *stream;
755 struct pstream *pstream;
761 /* Creates and returns a jsonrpc_session to 'name', which should be a string
762 * acceptable to stream_open() or pstream_open().
764 * If 'name' is an active connection method, e.g. "tcp:127.1.2.3", the new
765 * jsonrpc_session connects to 'name'. If 'retry' is true, then the new
766 * session connects and reconnects to 'name', with backoff. If 'retry' is
767 * false, the new session will only try to connect once and after a connection
768 * failure or a disconnection jsonrpc_session_is_alive() will return false for
771 * If 'name' is a passive connection method, e.g. "ptcp:", the new
772 * jsonrpc_session listens for connections to 'name'. It maintains at most one
773 * connection at any given time. Any new connection causes the previous one
774 * (if any) to be dropped. */
775 struct jsonrpc_session *
776 jsonrpc_session_open(const char *name, bool retry)
778 struct jsonrpc_session *s;
780 s = xmalloc(sizeof *s);
781 s->reconnect = reconnect_create(time_msec());
782 reconnect_set_name(s->reconnect, name);
783 reconnect_enable(s->reconnect, time_msec());
791 if (!pstream_verify_name(name)) {
792 reconnect_set_passive(s->reconnect, true, time_msec());
794 reconnect_set_max_tries(s->reconnect, 1);
795 reconnect_set_backoff(s->reconnect, INT_MAX, INT_MAX);
798 if (!stream_or_pstream_needs_probes(name)) {
799 reconnect_set_probe_interval(s->reconnect, 0);
805 /* Creates and returns a jsonrpc_session that is initially connected to
806 * 'jsonrpc'. If the connection is dropped, it will not be reconnected.
808 * On the assumption that such connections are likely to be short-lived
809 * (e.g. from ovs-vsctl), informational logging for them is suppressed. */
810 struct jsonrpc_session *
811 jsonrpc_session_open_unreliably(struct jsonrpc *jsonrpc, uint8_t dscp)
813 struct jsonrpc_session *s;
815 s = xmalloc(sizeof *s);
816 s->reconnect = reconnect_create(time_msec());
817 reconnect_set_quiet(s->reconnect, true);
818 reconnect_set_name(s->reconnect, jsonrpc_get_name(jsonrpc));
819 reconnect_set_max_tries(s->reconnect, 0);
820 reconnect_connected(s->reconnect, time_msec());
831 jsonrpc_session_close(struct jsonrpc_session *s)
834 jsonrpc_close(s->rpc);
835 reconnect_destroy(s->reconnect);
836 stream_close(s->stream);
837 pstream_close(s->pstream);
843 jsonrpc_session_disconnect(struct jsonrpc_session *s)
846 jsonrpc_error(s->rpc, EOF);
847 jsonrpc_close(s->rpc);
850 } else if (s->stream) {
851 stream_close(s->stream);
858 jsonrpc_session_connect(struct jsonrpc_session *s)
860 const char *name = reconnect_get_name(s->reconnect);
863 jsonrpc_session_disconnect(s);
864 if (!reconnect_is_passive(s->reconnect)) {
865 error = jsonrpc_stream_open(name, &s->stream, s->dscp);
867 reconnect_connecting(s->reconnect, time_msec());
869 s->last_error = error;
872 error = s->pstream ? 0 : jsonrpc_pstream_open(name, &s->pstream,
875 reconnect_listening(s->reconnect, time_msec());
880 reconnect_connect_failed(s->reconnect, time_msec(), error);
886 jsonrpc_session_run(struct jsonrpc_session *s)
889 struct stream *stream;
892 error = pstream_accept(s->pstream, &stream);
894 if (s->rpc || s->stream) {
896 "%s: new connection replacing active connection",
897 reconnect_get_name(s->reconnect));
898 jsonrpc_session_disconnect(s);
900 reconnect_connected(s->reconnect, time_msec());
901 s->rpc = jsonrpc_open(stream);
902 } else if (error != EAGAIN) {
903 reconnect_listen_error(s->reconnect, time_msec(), error);
904 pstream_close(s->pstream);
913 backlog = jsonrpc_get_backlog(s->rpc);
915 if (jsonrpc_get_backlog(s->rpc) < backlog) {
916 /* Data previously caught in a queue was successfully sent (or
917 * there's an error, which we'll catch below.)
919 * We don't count data that is successfully sent immediately as
920 * activity, because there's a lot of queuing downstream from us,
921 * which means that we can push a lot of data into a connection
922 * that has stalled and won't ever recover.
924 reconnect_activity(s->reconnect, time_msec());
927 error = jsonrpc_get_status(s->rpc);
929 reconnect_disconnected(s->reconnect, time_msec(), error);
930 jsonrpc_session_disconnect(s);
931 s->last_error = error;
933 } else if (s->stream) {
936 stream_run(s->stream);
937 error = stream_connect(s->stream);
939 reconnect_connected(s->reconnect, time_msec());
940 s->rpc = jsonrpc_open(s->stream);
942 } else if (error != EAGAIN) {
943 reconnect_connect_failed(s->reconnect, time_msec(), error);
944 stream_close(s->stream);
949 switch (reconnect_run(s->reconnect, time_msec())) {
950 case RECONNECT_CONNECT:
951 jsonrpc_session_connect(s);
954 case RECONNECT_DISCONNECT:
955 reconnect_disconnected(s->reconnect, time_msec(), 0);
956 jsonrpc_session_disconnect(s);
959 case RECONNECT_PROBE:
962 struct jsonrpc_msg *request;
964 params = json_array_create_empty();
965 request = jsonrpc_create_request("echo", params, NULL);
966 json_destroy(request->id);
967 request->id = json_string_create("echo");
968 jsonrpc_send(s->rpc, request);
975 jsonrpc_session_wait(struct jsonrpc_session *s)
978 jsonrpc_wait(s->rpc);
979 } else if (s->stream) {
980 stream_run_wait(s->stream);
981 stream_connect_wait(s->stream);
984 pstream_wait(s->pstream);
986 reconnect_wait(s->reconnect, time_msec());
990 jsonrpc_session_get_backlog(const struct jsonrpc_session *s)
992 return s->rpc ? jsonrpc_get_backlog(s->rpc) : 0;
995 /* Always returns a pointer to a valid C string, assuming 's' was initialized
998 jsonrpc_session_get_name(const struct jsonrpc_session *s)
1000 return reconnect_get_name(s->reconnect);
1003 /* Always takes ownership of 'msg', regardless of success. */
1005 jsonrpc_session_send(struct jsonrpc_session *s, struct jsonrpc_msg *msg)
1008 return jsonrpc_send(s->rpc, msg);
1010 jsonrpc_msg_destroy(msg);
1015 struct jsonrpc_msg *
1016 jsonrpc_session_recv(struct jsonrpc_session *s)
1019 unsigned int received_bytes;
1020 struct jsonrpc_msg *msg;
1022 received_bytes = jsonrpc_get_received_bytes(s->rpc);
1023 jsonrpc_recv(s->rpc, &msg);
1024 if (received_bytes != jsonrpc_get_received_bytes(s->rpc)) {
1025 /* Data was successfully received.
1027 * Previously we only counted receiving a full message as activity,
1028 * but with large messages or a slow connection that policy could
1029 * time out the session mid-message. */
1030 reconnect_activity(s->reconnect, time_msec());
1034 if (msg->type == JSONRPC_REQUEST && !strcmp(msg->method, "echo")) {
1035 /* Echo request. Send reply. */
1036 struct jsonrpc_msg *reply;
1038 reply = jsonrpc_create_reply(json_clone(msg->params), msg->id);
1039 jsonrpc_session_send(s, reply);
1040 } else if (msg->type == JSONRPC_REPLY
1041 && msg->id && msg->id->type == JSON_STRING
1042 && !strcmp(msg->id->u.string, "echo")) {
1043 /* It's a reply to our echo request. Suppress it. */
1047 jsonrpc_msg_destroy(msg);
1054 jsonrpc_session_recv_wait(struct jsonrpc_session *s)
1057 jsonrpc_recv_wait(s->rpc);
1062 jsonrpc_session_is_alive(const struct jsonrpc_session *s)
1064 return s->rpc || s->stream || reconnect_get_max_tries(s->reconnect);
1068 jsonrpc_session_is_connected(const struct jsonrpc_session *s)
1070 return s->rpc != NULL;
1074 jsonrpc_session_get_seqno(const struct jsonrpc_session *s)
1080 jsonrpc_session_get_status(const struct jsonrpc_session *s)
1082 return s && s->rpc ? jsonrpc_get_status(s->rpc) : 0;
1086 jsonrpc_session_get_last_error(const struct jsonrpc_session *s)
1088 return s->last_error;
1092 jsonrpc_session_get_reconnect_stats(const struct jsonrpc_session *s,
1093 struct reconnect_stats *stats)
1095 reconnect_get_stats(s->reconnect, time_msec(), stats);
1099 jsonrpc_session_force_reconnect(struct jsonrpc_session *s)
1101 reconnect_force_reconnect(s->reconnect, time_msec());
1105 jsonrpc_session_set_max_backoff(struct jsonrpc_session *s, int max_backoff)
1107 reconnect_set_backoff(s->reconnect, 0, max_backoff);
1111 jsonrpc_session_set_probe_interval(struct jsonrpc_session *s,
1114 reconnect_set_probe_interval(s->reconnect, probe_interval);
1118 jsonrpc_session_set_dscp(struct jsonrpc_session *s,
1121 if (s->dscp != dscp) {
1125 error = pstream_set_dscp(s->pstream, dscp);
1127 VLOG_ERR("%s: failed set_dscp %s",
1128 reconnect_get_name(s->reconnect),
1129 ovs_strerror(error));
1132 * XXX race window between setting dscp to listening socket
1133 * and accepting socket. accepted socket may have old dscp value.
1134 * Ignore this race window for now.
1138 jsonrpc_session_force_reconnect(s);