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Import from old repository commit 61ef2b42a9c4ba8e1600f15bb0236765edc2ad45.

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Ben Pfaff
2009-07-08 13:19:16 -07:00
commit 064af42167
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104
lib/rconn.h Normal file
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/*
* Copyright (c) 2008, 2009 Nicira Networks.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef RCONN_H
#define RCONN_H 1
#include "queue.h"
#include <stdbool.h>
#include <stdint.h>
#include <time.h>
/* A wrapper around vconn that provides queuing and optionally reliability.
*
* An rconn maintains a message transmission queue of bounded length specified
* by the caller. The rconn does not guarantee reliable delivery of
* queued messages: all queued messages are dropped when reconnection becomes
* necessary.
*
* An rconn optionally provides reliable communication, in this sense: the
* rconn will re-connect, with exponential backoff, when the underlying vconn
* disconnects.
*/
struct vconn;
struct rconn_packet_counter;
struct rconn *rconn_new(const char *name,
int inactivity_probe_interval, int max_backoff);
struct rconn *rconn_new_from_vconn(const char *name, struct vconn *);
struct rconn *rconn_create(int inactivity_probe_interval, int max_backoff);
void rconn_set_max_backoff(struct rconn *, int max_backoff);
int rconn_get_max_backoff(const struct rconn *);
void rconn_set_probe_interval(struct rconn *, int inactivity_probe_interval);
int rconn_get_probe_interval(const struct rconn *);
int rconn_connect(struct rconn *, const char *name);
void rconn_connect_unreliably(struct rconn *,
const char *name, struct vconn *vconn);
void rconn_reconnect(struct rconn *);
void rconn_disconnect(struct rconn *);
void rconn_destroy(struct rconn *);
void rconn_run(struct rconn *);
void rconn_run_wait(struct rconn *);
struct ofpbuf *rconn_recv(struct rconn *);
void rconn_recv_wait(struct rconn *);
int rconn_send(struct rconn *, struct ofpbuf *, struct rconn_packet_counter *);
int rconn_send_with_limit(struct rconn *, struct ofpbuf *,
struct rconn_packet_counter *, int queue_limit);
unsigned int rconn_packets_sent(const struct rconn *);
unsigned int rconn_packets_received(const struct rconn *);
void rconn_add_monitor(struct rconn *, struct vconn *);
const char *rconn_get_name(const struct rconn *);
bool rconn_is_alive(const struct rconn *);
bool rconn_is_connected(const struct rconn *);
int rconn_failure_duration(const struct rconn *);
bool rconn_is_connectivity_questionable(struct rconn *);
uint32_t rconn_get_ip(const struct rconn *);
const char *rconn_get_state(const struct rconn *);
unsigned int rconn_get_attempted_connections(const struct rconn *);
unsigned int rconn_get_successful_connections(const struct rconn *);
time_t rconn_get_last_connection(const struct rconn *);
time_t rconn_get_creation_time(const struct rconn *);
unsigned long int rconn_get_total_time_connected(const struct rconn *);
int rconn_get_backoff(const struct rconn *);
unsigned int rconn_get_state_elapsed(const struct rconn *);
unsigned int rconn_get_connection_seqno(const struct rconn *);
/* Counts the number of packets queued into an rconn by a given source. */
struct rconn_packet_counter {
int n; /* Number of packets queued. */
int ref_cnt; /* Number of owners. */
};
struct rconn_packet_counter *rconn_packet_counter_create(void);
void rconn_packet_counter_destroy(struct rconn_packet_counter *);
void rconn_packet_counter_inc(struct rconn_packet_counter *);
void rconn_packet_counter_dec(struct rconn_packet_counter *);
static inline int
rconn_packet_counter_read(const struct rconn_packet_counter *counter)
{
return counter->n;
}
#endif /* rconn.h */