This library implements the reconnection FSM used by the "rconn" library.
Therefore, it makes sense to change rconn to use this, and I have a patch
to do that, but I am not applying it at the moment to avoid changing unrelated
code on the "db" branch.
lib/random.h \
lib/rconn.c \
lib/rconn.h \
+ lib/reconnect.c \
+ lib/reconnect.h \
lib/rtnetlink.c \
lib/rtnetlink.h \
lib/sat-math.h \
--- /dev/null
+/*
+ * Copyright (c) 2008, 2009 Nicira Networks.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <config.h>
+#include "reconnect.h"
+
+#include <assert.h>
+#include <stdlib.h>
+
+#include "poll-loop.h"
+
+#define THIS_MODULE VLM_reconnect
+#include "vlog.h"
+
+#define STATES \
+ STATE(VOID, 1 << 0) \
+ STATE(BACKOFF, 1 << 1) \
+ STATE(CONNECTING, 1 << 2) \
+ STATE(ACTIVE, 1 << 3) \
+ STATE(IDLE, 1 << 4) \
+ STATE(RECONNECT, 1 << 5)
+enum state {
+#define STATE(NAME, VALUE) S_##NAME = VALUE,
+ STATES
+#undef STATE
+};
+
+static bool
+is_connected_state(enum state state)
+{
+ return (state & (S_ACTIVE | S_IDLE)) != 0;
+}
+
+struct reconnect {
+ /* Configuration. */
+ char *name;
+ int min_backoff;
+ int max_backoff;
+ int probe_interval;
+
+ /* State. */
+ enum state state;
+ long long int state_entered;
+ int backoff;
+ long long int last_received;
+ long long int last_connected;
+
+ /* These values are simply for statistics reporting, not otherwise used
+ * directly by anything internal. */
+ long long int creation_time;
+ unsigned int n_attempted_connections, n_successful_connections;
+ unsigned int total_connected_duration;
+ unsigned int seqno;
+};
+
+static void reconnect_transition__(struct reconnect *, long long int now,
+ enum state state);
+static long long int reconnect_deadline__(const struct reconnect *);
+
+static const char *
+reconnect_state_name__(enum state state)
+{
+ switch (state) {
+#define STATE(NAME, VALUE) case S_##NAME: return #NAME;
+ STATES
+#undef STATE
+ }
+ return "***ERROR***";
+}
+
+/* Creates and returns a new reconnect FSM with default settings. The FSM is
+ * initially disabled. The caller will likely want to call reconnect_enable()
+ * and reconnect_set_name() on the returned object. */
+struct reconnect *
+reconnect_create(long long int now)
+{
+ struct reconnect *fsm = xzalloc(sizeof *fsm);
+
+ fsm->name = xstrdup("void");
+ fsm->min_backoff = 1000;
+ fsm->max_backoff = 8000;
+ fsm->probe_interval = 5000;
+
+ fsm->state = S_VOID;
+ fsm->state_entered = now;
+ fsm->backoff = 0;
+ fsm->last_received = now;
+ fsm->last_connected = now;
+ fsm->creation_time = now;
+
+ return fsm;
+}
+
+/* Frees 'fsm'. */
+void
+reconnect_destroy(struct reconnect *fsm)
+{
+ if (fsm) {
+ free(fsm->name);
+ free(fsm);
+ }
+}
+
+/* Returns 'fsm''s name. */
+const char *
+reconnect_get_name(const struct reconnect *fsm)
+{
+ return fsm->name;
+}
+
+/* Sets 'fsm''s name to 'name'. If 'name' is null, then "void" is used
+ * instead.
+ *
+ * The name set for 'fsm' is used in log messages. */
+void
+reconnect_set_name(struct reconnect *fsm, const char *name)
+{
+ free(fsm->name);
+ fsm->name = xstrdup(name ? name : "void");
+}
+
+/* Return the minimum number of milliseconds to back off between consecutive
+ * connection attempts. The default is 1000 ms. */
+int
+reconnect_get_min_backoff(const struct reconnect *fsm)
+{
+ return fsm->min_backoff;
+}
+
+/* Return the maximum number of milliseconds to back off between consecutive
+ * connection attempts. The default is 8000 ms. */
+int
+reconnect_get_max_backoff(const struct reconnect *fsm)
+{
+ return fsm->max_backoff;
+}
+
+/* Returns the "probe interval" for 'fsm' in milliseconds. If this is zero, it
+ * disables the connection keepalive feature. If it is nonzero, then if the
+ * interval passes while 'fsm' is connected and without reconnect_received()
+ * being called for 'fsm', reconnect_run() returns RECONNECT_PROBE. If the
+ * interval passes again without reconnect_received() being called,
+ * reconnect_run() returns RECONNECT_DISCONNECT for 'fsm'. */
+int
+reconnect_get_probe_interval(const struct reconnect *fsm)
+{
+ return fsm->probe_interval;
+}
+
+/* Configures the backoff parameters for 'fsm'. 'min_backoff' is the minimum
+ * number of milliseconds, and 'max_backoff' is the maximum, between connection
+ * attempts.
+ *
+ * 'min_backoff' must be at least 1000, and 'max_backoff' must be greater than
+ * or equal to 'min_backoff'. */
+void
+reconnect_set_backoff(struct reconnect *fsm, int min_backoff, int max_backoff)
+{
+ fsm->min_backoff = MAX(min_backoff, 1000);
+ fsm->max_backoff = max_backoff ? MAX(max_backoff, 1000) : 8000;
+ if (fsm->min_backoff > fsm->max_backoff) {
+ fsm->max_backoff = fsm->min_backoff;
+ }
+
+ if (fsm->state == S_BACKOFF && fsm->backoff > max_backoff) {
+ fsm->backoff = max_backoff;
+ }
+}
+
+/* Sets the "probe interval" for 'fsm' to 'probe_interval', in milliseconds.
+ * If this is zero, it disables the connection keepalive feature. If it is
+ * nonzero, then if the interval passes while 'fsm' is connected and without
+ * reconnect_received() being called for 'fsm', reconnect_run() returns
+ * RECONNECT_PROBE. If the interval passes again without reconnect_received()
+ * being called, reconnect_run() returns RECONNECT_DISCONNECT for 'fsm'.
+ *
+ * If 'probe_interval' is nonzero, then it will be forced to a value of at
+ * least 1000 ms. */
+void
+reconnect_set_probe_interval(struct reconnect *fsm, int probe_interval)
+{
+ fsm->probe_interval = probe_interval ? MAX(1000, probe_interval) : 0;
+}
+
+/* Returns true if 'fsm' has been enabled with reconnect_enable(). Calling
+ * another function that indicates a change in connection state, such as
+ * reconnect_disconnected() or reconnect_force_reconnect(), will also enable
+ * a reconnect FSM. */
+bool
+reconnect_is_enabled(const struct reconnect *fsm)
+{
+ return fsm->state != S_VOID;
+}
+
+/* If 'fsm' is disabled (the default for newly created FSMs), enables it, so
+ * that the next call to reconnect_run() for 'fsm' will return
+ * RECONNECT_CONNECT.
+ *
+ * If 'fsm' is not disabled, this function has no effect. */
+void
+reconnect_enable(struct reconnect *fsm, long long int now)
+{
+ if (fsm->state == S_VOID) {
+ reconnect_transition__(fsm, now, S_BACKOFF);
+ fsm->backoff = 0;
+ }
+}
+
+/* Disables 'fsm'. Until 'fsm' is enabled again, reconnect_run() will always
+ * return 0. */
+void
+reconnect_disable(struct reconnect *fsm, long long int now)
+{
+ if (fsm->state != S_VOID) {
+ reconnect_transition__(fsm, now, S_VOID);
+ }
+}
+
+/* If 'fsm' is enabled and currently connected (or attempting to connect),
+ * forces reconnect_run() for 'fsm' to return RECONNECT_DISCONNECT the next
+ * time it is called, which should cause the client to drop the connection (or
+ * attempt), back off, and then reconnect. */
+void
+reconnect_force_reconnect(struct reconnect *fsm, long long int now)
+{
+ if (fsm->state & (S_CONNECTING | S_ACTIVE | S_IDLE)) {
+ reconnect_transition__(fsm, now, S_RECONNECT);
+ }
+}
+
+/* Tell 'fsm' that the connection dropped or that a connection attempt failed.
+ * 'error' specifies the reason: a positive value represents an errno value,
+ * EOF indicates that the connection was closed by the peer (e.g. read()
+ * returned 0), and 0 indicates no specific error.
+ *
+ * The FSM will back off, then reconnect. */
+void
+reconnect_disconnected(struct reconnect *fsm, long long int now, int error)
+{
+ if (fsm->state != S_BACKOFF) {
+ /* Report what happened. */
+ if (fsm->state & (S_ACTIVE | S_IDLE)) {
+ if (error > 0) {
+ VLOG_WARN("%s: connection dropped (%s)",
+ fsm->name, strerror(error));
+ } else if (error == EOF) {
+ VLOG_INFO("%s: connection closed by peer", fsm->name);
+ } else {
+ VLOG_INFO("%s: connection dropped", fsm->name);
+ }
+ } else {
+ if (error > 0) {
+ VLOG_WARN("%s: connection attempt failed (%s)",
+ fsm->name, strerror(error));
+ } else {
+ VLOG_INFO("%s: connection attempt timed out", fsm->name);
+ }
+ }
+
+ /* Back off. */
+ if (fsm->state & (S_ACTIVE | S_IDLE)
+ && fsm->last_received - fsm->last_connected >= fsm->backoff) {
+ fsm->backoff = fsm->min_backoff;
+ } else {
+ if (fsm->backoff < fsm->min_backoff) {
+ fsm->backoff = fsm->min_backoff;
+ } else if (fsm->backoff >= fsm->max_backoff / 2) {
+ fsm->backoff = fsm->max_backoff;
+ } else {
+ fsm->backoff *= 2;
+ }
+ VLOG_INFO("%s: waiting %.3g seconds before reconnect\n",
+ fsm->name, fsm->backoff / 1000.0);
+ }
+ reconnect_transition__(fsm, now, S_BACKOFF);
+ }
+}
+
+/* Tell 'fsm' that a connection attempt is in progress.
+ *
+ * The FSM will start a timer, after which the connection attempt will be
+ * aborted (by returning RECONNECT_DISCONNECT from reconect_run()). */
+void
+reconnect_connecting(struct reconnect *fsm, long long int now)
+{
+ if (fsm->state != S_CONNECTING) {
+ VLOG_INFO("%s: connecting...", fsm->name);
+ reconnect_transition__(fsm, now, S_CONNECTING);
+ }
+}
+
+/* Tell 'fsm' that the connection was successful.
+ *
+ * The FSM will start the probe interval timer, which is reset by
+ * reconnect_received(). If the timer expires, a probe will be sent (by
+ * returning RECONNECT_PROBE from reconnect_run()). If the timer expires
+ * again without being reset, the connection will be aborted (by returning
+ * RECONNECT_DISCONNECT from reconnect_run()). */
+void
+reconnect_connected(struct reconnect *fsm, long long int now)
+{
+ if (!is_connected_state(fsm->state)) {
+ reconnect_connecting(fsm, now);
+
+ VLOG_INFO("%s: connected", fsm->name);
+ reconnect_transition__(fsm, now, S_ACTIVE);
+ fsm->last_connected = now;
+ }
+}
+
+/* Tell 'fsm' that the connection attempt failed.
+ *
+ * The FSM will back off and attempt to reconnect. */
+void
+reconnect_connect_failed(struct reconnect *fsm, long long int now, int error)
+{
+ reconnect_connecting(fsm, now);
+ reconnect_disconnected(fsm, now, error);
+}
+
+/* Tell 'fsm' that some data was received. This resets the probe interval
+ * timer, so that the connection is known not to be idle. */
+void
+reconnect_received(struct reconnect *fsm, long long int now)
+{
+ if (fsm->state != S_ACTIVE) {
+ reconnect_transition__(fsm, now, S_ACTIVE);
+ }
+ fsm->last_received = now;
+}
+
+static void
+reconnect_transition__(struct reconnect *fsm, long long int now,
+ enum state state)
+{
+ if (fsm->state == S_CONNECTING) {
+ fsm->n_attempted_connections++;
+ if (state == S_ACTIVE) {
+ fsm->n_successful_connections++;
+ }
+ }
+ if (is_connected_state(fsm->state) != is_connected_state(state)) {
+ if (is_connected_state(fsm->state)) {
+ fsm->total_connected_duration += now - fsm->last_connected;
+ }
+ fsm->seqno++;
+ }
+
+ VLOG_DBG("%s: entering %s", fsm->name, reconnect_state_name__(state));
+ fsm->state = state;
+ fsm->state_entered = now;
+}
+
+static long long int
+reconnect_deadline__(const struct reconnect *fsm)
+{
+ assert(fsm->state_entered != LLONG_MIN);
+ switch (fsm->state) {
+ case S_VOID:
+ return LLONG_MAX;
+
+ case S_BACKOFF:
+ return fsm->state_entered + fsm->backoff;
+
+ case S_CONNECTING:
+ return fsm->state_entered + MAX(1000, fsm->backoff);
+
+ case S_ACTIVE:
+ if (fsm->probe_interval) {
+ long long int base = MAX(fsm->last_received, fsm->state_entered);
+ return base + fsm->probe_interval;
+ }
+ return LLONG_MAX;
+
+ case S_IDLE:
+ return fsm->state_entered + fsm->probe_interval;
+
+ case S_RECONNECT:
+ return fsm->state_entered;
+ }
+
+ NOT_REACHED();
+}
+
+/* Assesses whether any action should be taken on 'fsm'. The return value is
+ * one of:
+ *
+ * - 0: The client need not take any action.
+ *
+ * - RECONNECT_CONNECT: The client should start a connection attempt and
+ * indicate this by calling reconnect_connecting(). If the connection
+ * attempt has definitely succeeded, it should call
+ * reconnect_connected(). If the connection attempt has definitely
+ * failed, it should call reconnect_connect_failed().
+ *
+ * The FSM is smart enough to back off correctly after successful
+ * connections that quickly abort, so it is OK to call
+ * reconnect_connected() after a low-level successful connection
+ * (e.g. connect()) even if the connection might soon abort due to a
+ * failure at a high-level (e.g. SSL negotiation failure).
+ *
+ * - RECONNECT_DISCONNECT: The client should abort the current connection
+ * or connection attempt and call reconnect_disconnected() or
+ * reconnect_connect_failed() to indicate it.
+ *
+ * - RECONNECT_PROBE: The client should send some kind of request to the
+ * peer that will elicit a response, to ensure that the connection is
+ * indeed in working order. (This will only be returned if the "probe
+ * interval" is nonzero--see reconnect_set_probe_interval()).
+ */
+enum reconnect_action
+reconnect_run(struct reconnect *fsm, long long int now)
+{
+ if (now >= reconnect_deadline__(fsm)) {
+ switch (fsm->state) {
+ case S_VOID:
+ return 0;
+
+ case S_BACKOFF:
+ return RECONNECT_CONNECT;
+
+ case S_CONNECTING:
+ return RECONNECT_DISCONNECT;
+
+ case S_ACTIVE:
+ VLOG_DBG("%s: idle %lld ms, sending inactivity probe", fsm->name,
+ now - MAX(fsm->last_received, fsm->state_entered));
+ reconnect_transition__(fsm, now, S_IDLE);
+ return RECONNECT_PROBE;
+
+ case S_IDLE:
+ VLOG_ERR("%s: no response to inactivity probe after %.3g "
+ "seconds, disconnecting",
+ fsm->name, (now - fsm->state_entered) / 1000.0);
+ return RECONNECT_DISCONNECT;
+
+ case S_RECONNECT:
+ return RECONNECT_DISCONNECT;
+ }
+
+ NOT_REACHED();
+ } else {
+ return fsm->state == S_CONNECTING ? RECONNECT_CONNECT : 0;
+ }
+}
+
+/* Causes the next call to poll_block() to wake up when reconnect_run() should
+ * be called on 'fsm'. */
+void
+reconnect_wait(struct reconnect *fsm, long long int now)
+{
+ int timeout = reconnect_timeout(fsm, now);
+ if (timeout >= 0) {
+ poll_timer_wait(timeout);
+ }
+}
+
+/* Returns the number of milliseconds after which reconnect_run() should be
+ * called on 'fsm' if nothing else notable happens in the meantime, or a
+ * negative number if this is currently unnecessary. */
+int
+reconnect_timeout(struct reconnect *fsm, long long int now)
+{
+ long long int deadline = reconnect_deadline__(fsm);
+ if (deadline != LLONG_MAX) {
+ long long int remaining = deadline - now;
+ return MAX(0, MIN(INT_MAX, remaining));
+ }
+ return -1;
+}
+
+/* Returns true if 'fsm' is currently believed to be connected, that is, if
+ * reconnect_connected() was called more recently than any call to
+ * reconnect_connect_failed() or reconnect_disconnected() or
+ * reconnect_disable(), and false otherwise. */
+bool
+reconnect_is_connected(const struct reconnect *fsm)
+{
+ return is_connected_state(fsm->state);
+}
+
+/* Returns the number of milliseconds for which 'fsm' has been continuously
+ * connected to its peer. (If 'fsm' is not currently connected, this is 0.) */
+unsigned int
+reconnect_get_connection_duration(const struct reconnect *fsm,
+ long long int now)
+{
+ return reconnect_is_connected(fsm) ? now - fsm->last_connected : 0;
+}
+
+/* Copies various statistics for 'fsm' into '*stats'. */
+void
+reconnect_get_stats(const struct reconnect *fsm, long long int now,
+ struct reconnect_stats *stats)
+{
+ stats->creation_time = fsm->creation_time;
+ stats->last_received = fsm->last_received;
+ stats->last_connected = fsm->last_connected;
+ stats->backoff = fsm->backoff;
+ stats->seqno = fsm->seqno;
+ stats->is_connected = reconnect_is_connected(fsm);
+ stats->current_connection_duration
+ = reconnect_get_connection_duration(fsm, now);
+ stats->total_connected_duration = (stats->current_connection_duration
+ + fsm->total_connected_duration);
+ stats->n_attempted_connections = fsm->n_attempted_connections;
+ stats->n_successful_connections = fsm->n_successful_connections;
+ stats->state = reconnect_state_name__(fsm->state);
+ stats->state_elapsed = now - fsm->state_entered;
+}
--- /dev/null
+/*
+ * Copyright (c) 2009 Nicira Networks.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef RECONNECT_H
+#define RECONNECT_H 1
+
+/* This library implements a finite-state machine for connecting and
+ * reconnecting to a network resource with exponential backoff. It also
+ * provides optional support for detecting a connection on which the peer is no
+ * longer responding.
+ *
+ * The library does not implement anything networking related, only an FSM for
+ * networking code to use.
+ *
+ * Many "reconnect" functions take a "now" argument. This makes testing easier
+ * since there is no hidden state. When not testing, just pass the return
+ * value of time_msec() from timeval.h. (Perhaps this design should be
+ * revisited later.) */
+
+#include <stdbool.h>
+
+struct reconnect *reconnect_create(long long int now);
+void reconnect_destroy(struct reconnect *);
+
+const char *reconnect_get_name(const struct reconnect *);
+void reconnect_set_name(struct reconnect *, const char *name);
+
+int reconnect_get_min_backoff(const struct reconnect *);
+int reconnect_get_max_backoff(const struct reconnect *);
+int reconnect_get_probe_interval(const struct reconnect *);
+
+void reconnect_set_backoff(struct reconnect *,
+ int min_backoff, int max_backoff);
+void reconnect_set_probe_interval(struct reconnect *, int probe_interval);
+
+bool reconnect_is_enabled(const struct reconnect *);
+void reconnect_enable(struct reconnect *, long long int now);
+void reconnect_disable(struct reconnect *, long long int now);
+
+void reconnect_force_reconnect(struct reconnect *, long long int now);
+
+bool reconnect_is_connected(const struct reconnect *);
+unsigned int reconnect_get_connection_duration(const struct reconnect *,
+ long long int now);
+
+void reconnect_disconnected(struct reconnect *, long long int now, int error);
+void reconnect_connecting(struct reconnect *, long long int now);
+void reconnect_connected(struct reconnect *, long long int now);
+void reconnect_connect_failed(struct reconnect *, long long int now,
+ int error);
+void reconnect_received(struct reconnect *, long long int now);
+
+enum reconnect_action {
+ RECONNECT_CONNECT = 1,
+ RECONNECT_DISCONNECT,
+ RECONNECT_PROBE,
+};
+enum reconnect_action reconnect_run(struct reconnect *, long long int now);
+void reconnect_wait(struct reconnect *, long long int now);
+int reconnect_timeout(struct reconnect *, long long int now);
+
+struct reconnect_stats {
+ /* All times and durations in this structure are in milliseconds. */
+ long long int creation_time; /* Time reconnect_create() called. */
+ long long int last_received; /* Last call to reconnect_received(). */
+ long long int last_connected; /* Last call to reconnect_connected(). */
+ int backoff; /* Current backoff duration. */
+
+ unsigned int seqno; /* # of connections + # of disconnections. */
+
+ bool is_connected; /* Currently connected? */
+ unsigned int current_connection_duration; /* Time of current connection. */
+ unsigned int total_connected_duration; /* Sum of all connections. */
+ unsigned int n_attempted_connections;
+ unsigned int n_successful_connections;
+
+ /* These should only be provided to a human user for debugging purposes.
+ * The client should not attempt to interpret them. */
+ const char *state; /* FSM state. */
+ unsigned int state_elapsed; /* Time since FSM state entered. */
+};
+
+void reconnect_get_stats(const struct reconnect *, long long int now,
+ struct reconnect_stats *);
+
+#endif /* reconnect.h */
VLOG_MODULE(proc_net_compat)
VLOG_MODULE(process)
VLOG_MODULE(rconn)
+VLOG_MODULE(reconnect)
VLOG_MODULE(rtnetlink)
VLOG_MODULE(stp)
VLOG_MODULE(stream_fd)
tests/jsonrpc.at \
tests/timeval.at \
tests/lockfile.at \
+ tests/reconnect.at \
tests/ovsdb.at \
tests/ovsdb-file.at \
tests/ovsdb-types.at \
tests_test_ovsdb_LDADD = ovsdb/libovsdb.a lib/libopenvswitch.a
EXTRA_DIST += tests/uuidfilt.pl
+noinst_PROGRAMS += tests/test-reconnect
+tests_test_reconnect_SOURCES = tests/test-reconnect.c
+tests_test_reconnect_LDADD = lib/libopenvswitch.a
+
noinst_PROGRAMS += tests/test-sha1
tests_test_sha1_SOURCES = tests/test-sha1.c
tests_test_sha1_LDADD = lib/libopenvswitch.a
--- /dev/null
+AT_BANNER([reconnect library])
+
+######################################################################
+AT_SETUP([nothing happens if not enabled])
+AT_KEYWORDS([reconnect])
+AT_DATA([input], [run
+timeout
+])
+OVS_CHECK_LCOV([test-reconnect < input], [0],
+ [### t=1000 ###
+run
+timeout
+ no timeout
+])
+AT_CLEANUP
+
+######################################################################
+AT_SETUP([quick connect, idle disconnect])
+AT_KEYWORDS([reconnect])
+AT_DATA([input], [enable
+
+# Connection succeeds.
+run
+connected
+
+# Send inactivity probe.
+timeout
+run
+
+# Idle timeout kills connection.
+timeout
+run
+disconnected
+])
+OVS_CHECK_LCOV([test-reconnect < input], [0],
+ [### t=1000 ###
+enable
+ in BACKOFF for 0 ms (0 ms backoff)
+
+# Connection succeeds.
+run
+ should connect
+connected
+ in ACTIVE for 0 ms (0 ms backoff)
+ 1 successful connections out of 1 attempts, seqno 1
+ connected (0 ms), total 0 ms connected
+
+# Send inactivity probe.
+timeout
+ advance 5000 ms
+
+### t=6000 ###
+ in ACTIVE for 5000 ms (0 ms backoff)
+ connected (5000 ms), total 5000 ms connected
+run
+ should send probe
+ in IDLE for 0 ms (0 ms backoff)
+
+# Idle timeout kills connection.
+timeout
+ advance 5000 ms
+
+### t=11000 ###
+ in IDLE for 5000 ms (0 ms backoff)
+ connected (10000 ms), total 10000 ms connected
+run
+ should disconnect
+disconnected
+ in BACKOFF for 0 ms (1000 ms backoff)
+ 1 successful connections out of 1 attempts, seqno 2
+ not connected (0 ms), total 10000 ms connected
+])
+AT_CLEANUP
+
+######################################################################
+AT_SETUP([slow connect, idle disconnect])
+AT_KEYWORDS([reconnect])
+AT_DATA([input], [enable
+
+# Start connecting.
+run
+connecting
+
+# Connect after 500 ms.
+advance 500
+run
+connected
+
+# Send inactivity probe.
+timeout
+run
+
+# Idle timeout kills connection.
+timeout
+run
+disconnected
+])
+OVS_CHECK_LCOV([test-reconnect < input], [0],
+ [### t=1000 ###
+enable
+ in BACKOFF for 0 ms (0 ms backoff)
+
+# Start connecting.
+run
+ should connect
+connecting
+ in CONNECTING for 0 ms (0 ms backoff)
+
+# Connect after 500 ms.
+advance 500
+
+### t=1500 ###
+ in CONNECTING for 500 ms (0 ms backoff)
+run
+ should connect
+connected
+ in ACTIVE for 0 ms (0 ms backoff)
+ created 1000, last received 1000, last connected 1500
+ 1 successful connections out of 1 attempts, seqno 1
+ connected (0 ms), total 0 ms connected
+
+# Send inactivity probe.
+timeout
+ advance 5000 ms
+
+### t=6500 ###
+ in ACTIVE for 5000 ms (0 ms backoff)
+ connected (5000 ms), total 5000 ms connected
+run
+ should send probe
+ in IDLE for 0 ms (0 ms backoff)
+
+# Idle timeout kills connection.
+timeout
+ advance 5000 ms
+
+### t=11500 ###
+ in IDLE for 5000 ms (0 ms backoff)
+ connected (10000 ms), total 10000 ms connected
+run
+ should disconnect
+disconnected
+ in BACKOFF for 0 ms (1000 ms backoff)
+ 1 successful connections out of 1 attempts, seqno 2
+ not connected (0 ms), total 10000 ms connected
+])
+AT_CLEANUP
+
+######################################################################
+AT_SETUP([connect backs off])
+AT_KEYWORDS([reconnect])
+AT_DATA([input], [enable
+
+# First connection attempt fails after 1000 ms.
+run
+connecting
+run
+timeout
+run
+connect-failed
+
+# Back off for 1000 ms.
+timeout
+run
+
+# Second connection attempt fails after 1000 ms.
+connecting
+timeout
+run
+connect-failed
+
+# Back off for 2000 ms.
+timeout
+run
+
+# Third connection attempt fails after 2000 ms.
+connecting
+timeout
+run
+connect-failed
+
+# Back off for 4000 ms.
+timeout
+run
+
+# Third connection attempt fails after 4000 ms.
+connecting
+timeout
+run
+connect-failed
+
+# Back off for 8000 ms.
+timeout
+run
+
+# Third connection attempt fails after 8000 ms.
+connecting
+timeout
+run
+connect-failed
+
+# Back off for 8000 ms.
+timeout
+run
+
+# Fourth connection attempt fails after 8000 ms.
+connecting
+timeout
+run
+connect-failed
+])
+OVS_CHECK_LCOV([test-reconnect < input], [0],
+ [### t=1000 ###
+enable
+ in BACKOFF for 0 ms (0 ms backoff)
+
+# First connection attempt fails after 1000 ms.
+run
+ should connect
+connecting
+ in CONNECTING for 0 ms (0 ms backoff)
+run
+ should connect
+timeout
+ advance 1000 ms
+
+### t=2000 ###
+ in CONNECTING for 1000 ms (0 ms backoff)
+run
+ should disconnect
+connect-failed
+ in BACKOFF for 0 ms (1000 ms backoff)
+ 0 successful connections out of 1 attempts, seqno 0
+
+# Back off for 1000 ms.
+timeout
+ advance 1000 ms
+
+### t=3000 ###
+ in BACKOFF for 1000 ms (1000 ms backoff)
+run
+ should connect
+
+# Second connection attempt fails after 1000 ms.
+connecting
+ in CONNECTING for 0 ms (1000 ms backoff)
+timeout
+ advance 1000 ms
+
+### t=4000 ###
+ in CONNECTING for 1000 ms (1000 ms backoff)
+run
+ should disconnect
+connect-failed
+ in BACKOFF for 0 ms (2000 ms backoff)
+ 0 successful connections out of 2 attempts, seqno 0
+
+# Back off for 2000 ms.
+timeout
+ advance 2000 ms
+
+### t=6000 ###
+ in BACKOFF for 2000 ms (2000 ms backoff)
+run
+ should connect
+
+# Third connection attempt fails after 2000 ms.
+connecting
+ in CONNECTING for 0 ms (2000 ms backoff)
+timeout
+ advance 2000 ms
+
+### t=8000 ###
+ in CONNECTING for 2000 ms (2000 ms backoff)
+run
+ should disconnect
+connect-failed
+ in BACKOFF for 0 ms (4000 ms backoff)
+ 0 successful connections out of 3 attempts, seqno 0
+
+# Back off for 4000 ms.
+timeout
+ advance 4000 ms
+
+### t=12000 ###
+ in BACKOFF for 4000 ms (4000 ms backoff)
+run
+ should connect
+
+# Third connection attempt fails after 4000 ms.
+connecting
+ in CONNECTING for 0 ms (4000 ms backoff)
+timeout
+ advance 4000 ms
+
+### t=16000 ###
+ in CONNECTING for 4000 ms (4000 ms backoff)
+run
+ should disconnect
+connect-failed
+ in BACKOFF for 0 ms (8000 ms backoff)
+ 0 successful connections out of 4 attempts, seqno 0
+
+# Back off for 8000 ms.
+timeout
+ advance 8000 ms
+
+### t=24000 ###
+ in BACKOFF for 8000 ms (8000 ms backoff)
+run
+ should connect
+
+# Third connection attempt fails after 8000 ms.
+connecting
+ in CONNECTING for 0 ms (8000 ms backoff)
+timeout
+ advance 8000 ms
+
+### t=32000 ###
+ in CONNECTING for 8000 ms (8000 ms backoff)
+run
+ should disconnect
+connect-failed
+ in BACKOFF for 0 ms (8000 ms backoff)
+ 0 successful connections out of 5 attempts, seqno 0
+
+# Back off for 8000 ms.
+timeout
+ advance 8000 ms
+
+### t=40000 ###
+ in BACKOFF for 8000 ms (8000 ms backoff)
+run
+ should connect
+
+# Fourth connection attempt fails after 8000 ms.
+connecting
+ in CONNECTING for 0 ms (8000 ms backoff)
+timeout
+ advance 8000 ms
+
+### t=48000 ###
+ in CONNECTING for 8000 ms (8000 ms backoff)
+run
+ should disconnect
+connect-failed
+ in BACKOFF for 0 ms (8000 ms backoff)
+ 0 successful connections out of 6 attempts, seqno 0
+])
+AT_CLEANUP
+
+######################################################################
+AT_SETUP([connections with no data preserve backoff])
+AT_KEYWORDS([reconnect])
+AT_DATA([input], [enable
+
+# First connect, then idle timeout kills connection.
+run
+connected
+timeout
+run
+timeout
+run
+disconnected
+
+# Back off for 1000 ms.
+timeout
+run
+
+# Second connect, then idle timeout kills connection.
+run
+connected
+timeout
+run
+timeout
+run
+disconnected
+
+# Back off for 2000 ms.
+timeout
+run
+
+# Third connect, then idle timeout kills connection.
+run
+connected
+timeout
+run
+timeout
+run
+disconnected
+
+# Back off for 4000 ms.
+timeout
+], [### t=1000 ###
+enable
+ in BACKOFF for 0 ms (0 ms backoff)
+
+# First connect, then idle timeout kills connection.
+run
+ should connect
+connected
+ in ACTIVE for 0 ms (0 ms backoff)
+ 1 successful connections out of 1 attempts, seqno 1
+ connected (0 ms), total 0 ms connected
+timeout
+ advance 5000 ms
+
+### t=6000 ###
+ in ACTIVE for 5000 ms (0 ms backoff)
+ connected (5000 ms), total 5000 ms connected
+run
+ should send probe
+ in IDLE for 0 ms (0 ms backoff)
+timeout
+ advance 5000 ms
+
+### t=11000 ###
+ in IDLE for 5000 ms (0 ms backoff)
+ connected (10000 ms), total 10000 ms connected
+run
+ should disconnect
+disconnected
+ in BACKOFF for 0 ms (1000 ms backoff)
+ 1 successful connections out of 1 attempts, seqno 2
+ not connected (0 ms), total 10000 ms connected
+
+# Back off for 1000 ms.
+timeout
+ advance 1000 ms
+
+### t=12000 ###
+ in BACKOFF for 1000 ms (1000 ms backoff)
+run
+ should connect
+
+# Second connect, then idle timeout kills connection.
+run
+ should connect
+connected
+ in ACTIVE for 0 ms (1000 ms backoff)
+ created 1000, last received 1000, last connected 12000
+ 2 successful connections out of 2 attempts, seqno 3
+ connected (0 ms), total 10000 ms connected
+timeout
+ advance 5000 ms
+
+### t=17000 ###
+ in ACTIVE for 5000 ms (1000 ms backoff)
+ connected (5000 ms), total 15000 ms connected
+run
+ should send probe
+ in IDLE for 0 ms (1000 ms backoff)
+timeout
+ advance 5000 ms
+
+### t=22000 ###
+ in IDLE for 5000 ms (1000 ms backoff)
+ connected (10000 ms), total 20000 ms connected
+run
+ should disconnect
+disconnected
+ in BACKOFF for 0 ms (2000 ms backoff)
+ 2 successful connections out of 2 attempts, seqno 4
+ not connected (0 ms), total 20000 ms connected
+
+# Back off for 2000 ms.
+timeout
+ advance 2000 ms
+
+### t=24000 ###
+ in BACKOFF for 2000 ms (2000 ms backoff)
+run
+ should connect
+
+# Third connect, then idle timeout kills connection.
+run
+ should connect
+connected
+ in ACTIVE for 0 ms (2000 ms backoff)
+ created 1000, last received 1000, last connected 24000
+ 3 successful connections out of 3 attempts, seqno 5
+ connected (0 ms), total 20000 ms connected
+timeout
+ advance 5000 ms
+
+### t=29000 ###
+ in ACTIVE for 5000 ms (2000 ms backoff)
+ connected (5000 ms), total 25000 ms connected
+run
+ should send probe
+ in IDLE for 0 ms (2000 ms backoff)
+timeout
+ advance 5000 ms
+
+### t=34000 ###
+ in IDLE for 5000 ms (2000 ms backoff)
+ connected (10000 ms), total 30000 ms connected
+run
+ should disconnect
+disconnected
+ in BACKOFF for 0 ms (4000 ms backoff)
+ 3 successful connections out of 3 attempts, seqno 6
+ not connected (0 ms), total 30000 ms connected
+
+# Back off for 4000 ms.
+timeout
+ advance 4000 ms
+
+### t=38000 ###
+ in BACKOFF for 4000 ms (4000 ms backoff)
+
+])
+AT_CLEANUP
+
+######################################################################
+AT_SETUP([brief connection preserves backoff])
+AT_KEYWORDS([reconnect])
+AT_DATA([input], [enable
+
+# First connection attempt fails after 1000 ms.
+run
+connecting
+run
+timeout
+run
+connect-failed
+
+# Back off for 1000 ms.
+timeout
+run
+
+# Second connection attempt fails after 1000 ms.
+connecting
+timeout
+run
+connect-failed
+
+# Back off for 2000 ms.
+timeout
+run
+
+# Third connection attempt succeeds after 500 ms.
+connecting
+advance 500
+run
+connected
+
+# Connection drops after another 250 ms.
+advance 250
+disconnected
+run
+
+# Back off for 4000 ms.
+timeout
+run
+])
+OVS_CHECK_LCOV([test-reconnect < input], [0],
+ [### t=1000 ###
+enable
+ in BACKOFF for 0 ms (0 ms backoff)
+
+# First connection attempt fails after 1000 ms.
+run
+ should connect
+connecting
+ in CONNECTING for 0 ms (0 ms backoff)
+run
+ should connect
+timeout
+ advance 1000 ms
+
+### t=2000 ###
+ in CONNECTING for 1000 ms (0 ms backoff)
+run
+ should disconnect
+connect-failed
+ in BACKOFF for 0 ms (1000 ms backoff)
+ 0 successful connections out of 1 attempts, seqno 0
+
+# Back off for 1000 ms.
+timeout
+ advance 1000 ms
+
+### t=3000 ###
+ in BACKOFF for 1000 ms (1000 ms backoff)
+run
+ should connect
+
+# Second connection attempt fails after 1000 ms.
+connecting
+ in CONNECTING for 0 ms (1000 ms backoff)
+timeout
+ advance 1000 ms
+
+### t=4000 ###
+ in CONNECTING for 1000 ms (1000 ms backoff)
+run
+ should disconnect
+connect-failed
+ in BACKOFF for 0 ms (2000 ms backoff)
+ 0 successful connections out of 2 attempts, seqno 0
+
+# Back off for 2000 ms.
+timeout
+ advance 2000 ms
+
+### t=6000 ###
+ in BACKOFF for 2000 ms (2000 ms backoff)
+run
+ should connect
+
+# Third connection attempt succeeds after 500 ms.
+connecting
+ in CONNECTING for 0 ms (2000 ms backoff)
+advance 500
+
+### t=6500 ###
+ in CONNECTING for 500 ms (2000 ms backoff)
+run
+ should connect
+connected
+ in ACTIVE for 0 ms (2000 ms backoff)
+ created 1000, last received 1000, last connected 6500
+ 1 successful connections out of 3 attempts, seqno 1
+ connected (0 ms), total 0 ms connected
+
+# Connection drops after another 250 ms.
+advance 250
+
+### t=6750 ###
+ in ACTIVE for 250 ms (2000 ms backoff)
+ connected (250 ms), total 250 ms connected
+disconnected
+ in BACKOFF for 0 ms (4000 ms backoff)
+ 1 successful connections out of 3 attempts, seqno 2
+ not connected (0 ms), total 250 ms connected
+run
+
+# Back off for 4000 ms.
+timeout
+ advance 4000 ms
+
+### t=10750 ###
+ in BACKOFF for 4000 ms (4000 ms backoff)
+run
+ should connect
+])
+AT_CLEANUP
+
+######################################################################
+AT_SETUP([brief connection with data preserves backoff])
+AT_KEYWORDS([reconnect])
+AT_DATA([input], [enable
+
+# First connection attempt fails after 1000 ms.
+run
+connecting
+run
+timeout
+run
+connect-failed
+
+# Back off for 1000 ms.
+timeout
+run
+
+# Second connection attempt fails after 1000 ms.
+connecting
+timeout
+run
+connect-failed
+
+# Back off for 2000 ms.
+timeout
+run
+
+# Third connection attempt succeeds after 500 ms.
+connecting
+advance 500
+run
+connected
+
+# Connection receives 3 chunks of data spaced 250 ms apart.
+advance 250
+run
+received
+advance 250
+run
+received
+advance 250
+run
+received
+
+# Connection drops.
+disconnected
+run
+
+# Back off for 4000 ms.
+timeout
+run
+])
+OVS_CHECK_LCOV([test-reconnect < input], [0],
+ [### t=1000 ###
+enable
+ in BACKOFF for 0 ms (0 ms backoff)
+
+# First connection attempt fails after 1000 ms.
+run
+ should connect
+connecting
+ in CONNECTING for 0 ms (0 ms backoff)
+run
+ should connect
+timeout
+ advance 1000 ms
+
+### t=2000 ###
+ in CONNECTING for 1000 ms (0 ms backoff)
+run
+ should disconnect
+connect-failed
+ in BACKOFF for 0 ms (1000 ms backoff)
+ 0 successful connections out of 1 attempts, seqno 0
+
+# Back off for 1000 ms.
+timeout
+ advance 1000 ms
+
+### t=3000 ###
+ in BACKOFF for 1000 ms (1000 ms backoff)
+run
+ should connect
+
+# Second connection attempt fails after 1000 ms.
+connecting
+ in CONNECTING for 0 ms (1000 ms backoff)
+timeout
+ advance 1000 ms
+
+### t=4000 ###
+ in CONNECTING for 1000 ms (1000 ms backoff)
+run
+ should disconnect
+connect-failed
+ in BACKOFF for 0 ms (2000 ms backoff)
+ 0 successful connections out of 2 attempts, seqno 0
+
+# Back off for 2000 ms.
+timeout
+ advance 2000 ms
+
+### t=6000 ###
+ in BACKOFF for 2000 ms (2000 ms backoff)
+run
+ should connect
+
+# Third connection attempt succeeds after 500 ms.
+connecting
+ in CONNECTING for 0 ms (2000 ms backoff)
+advance 500
+
+### t=6500 ###
+ in CONNECTING for 500 ms (2000 ms backoff)
+run
+ should connect
+connected
+ in ACTIVE for 0 ms (2000 ms backoff)
+ created 1000, last received 1000, last connected 6500
+ 1 successful connections out of 3 attempts, seqno 1
+ connected (0 ms), total 0 ms connected
+
+# Connection receives 3 chunks of data spaced 250 ms apart.
+advance 250
+
+### t=6750 ###
+ in ACTIVE for 250 ms (2000 ms backoff)
+ connected (250 ms), total 250 ms connected
+run
+received
+ created 1000, last received 6750, last connected 6500
+advance 250
+
+### t=7000 ###
+ in ACTIVE for 500 ms (2000 ms backoff)
+ connected (500 ms), total 500 ms connected
+run
+received
+ created 1000, last received 7000, last connected 6500
+advance 250
+
+### t=7250 ###
+ in ACTIVE for 750 ms (2000 ms backoff)
+ connected (750 ms), total 750 ms connected
+run
+received
+ created 1000, last received 7250, last connected 6500
+
+# Connection drops.
+disconnected
+ in BACKOFF for 0 ms (4000 ms backoff)
+ 1 successful connections out of 3 attempts, seqno 2
+ not connected (0 ms), total 750 ms connected
+run
+
+# Back off for 4000 ms.
+timeout
+ advance 4000 ms
+
+### t=11250 ###
+ in BACKOFF for 4000 ms (4000 ms backoff)
+run
+ should connect
+])
+AT_CLEANUP
+
+######################################################################
+AT_SETUP([long connection resets backoff])
+AT_KEYWORDS([reconnect])
+AT_DATA([input], [enable
+
+# First connection attempt fails after 1000 ms.
+run
+connecting
+run
+timeout
+run
+connect-failed
+
+# Back off for 1000 ms.
+timeout
+run
+
+# Second connection attempt fails after 1000 ms.
+connecting
+timeout
+run
+connect-failed
+
+# Back off for 2000 ms.
+timeout
+run
+
+# Third connection attempt succeeds after 500 ms.
+connecting
+advance 500
+run
+connected
+
+# Connection receives 3 chunks of data spaced 2000 ms apart.
+advance 2000
+run
+received
+advance 2000
+run
+received
+advance 2000
+run
+received
+
+# Connection drops.
+disconnected
+run
+
+# Back off for 1000 ms.
+timeout
+run
+])
+OVS_CHECK_LCOV([test-reconnect < input], [0],
+ [### t=1000 ###
+enable
+ in BACKOFF for 0 ms (0 ms backoff)
+
+# First connection attempt fails after 1000 ms.
+run
+ should connect
+connecting
+ in CONNECTING for 0 ms (0 ms backoff)
+run
+ should connect
+timeout
+ advance 1000 ms
+
+### t=2000 ###
+ in CONNECTING for 1000 ms (0 ms backoff)
+run
+ should disconnect
+connect-failed
+ in BACKOFF for 0 ms (1000 ms backoff)
+ 0 successful connections out of 1 attempts, seqno 0
+
+# Back off for 1000 ms.
+timeout
+ advance 1000 ms
+
+### t=3000 ###
+ in BACKOFF for 1000 ms (1000 ms backoff)
+run
+ should connect
+
+# Second connection attempt fails after 1000 ms.
+connecting
+ in CONNECTING for 0 ms (1000 ms backoff)
+timeout
+ advance 1000 ms
+
+### t=4000 ###
+ in CONNECTING for 1000 ms (1000 ms backoff)
+run
+ should disconnect
+connect-failed
+ in BACKOFF for 0 ms (2000 ms backoff)
+ 0 successful connections out of 2 attempts, seqno 0
+
+# Back off for 2000 ms.
+timeout
+ advance 2000 ms
+
+### t=6000 ###
+ in BACKOFF for 2000 ms (2000 ms backoff)
+run
+ should connect
+
+# Third connection attempt succeeds after 500 ms.
+connecting
+ in CONNECTING for 0 ms (2000 ms backoff)
+advance 500
+
+### t=6500 ###
+ in CONNECTING for 500 ms (2000 ms backoff)
+run
+ should connect
+connected
+ in ACTIVE for 0 ms (2000 ms backoff)
+ created 1000, last received 1000, last connected 6500
+ 1 successful connections out of 3 attempts, seqno 1
+ connected (0 ms), total 0 ms connected
+
+# Connection receives 3 chunks of data spaced 2000 ms apart.
+advance 2000
+
+### t=8500 ###
+ in ACTIVE for 2000 ms (2000 ms backoff)
+ connected (2000 ms), total 2000 ms connected
+run
+received
+ created 1000, last received 8500, last connected 6500
+advance 2000
+
+### t=10500 ###
+ in ACTIVE for 4000 ms (2000 ms backoff)
+ connected (4000 ms), total 4000 ms connected
+run
+received
+ created 1000, last received 10500, last connected 6500
+advance 2000
+
+### t=12500 ###
+ in ACTIVE for 6000 ms (2000 ms backoff)
+ connected (6000 ms), total 6000 ms connected
+run
+received
+ created 1000, last received 12500, last connected 6500
+
+# Connection drops.
+disconnected
+ in BACKOFF for 0 ms (1000 ms backoff)
+ 1 successful connections out of 3 attempts, seqno 2
+ not connected (0 ms), total 6000 ms connected
+run
+
+# Back off for 1000 ms.
+timeout
+ advance 1000 ms
+
+### t=13500 ###
+ in BACKOFF for 1000 ms (1000 ms backoff)
+run
+ should connect
+])
+AT_CLEANUP
+
+######################################################################
+AT_SETUP([connection attempt fails quickly])
+AT_KEYWORDS([reconnect])
+AT_DATA([input], [enable
+
+# Connection fails quickly.
+run
+connect-failed ECONNREFUSED
+
+# Back off for 1000 ms.
+run
+timeout
+
+# Connection fails quickly again.
+run
+connect-failed ECONNREFUSED
+
+# Back off for 2000 ms.
+run
+timeout
+])
+OVS_CHECK_LCOV([test-reconnect < input], [0],
+ [### t=1000 ###
+enable
+ in BACKOFF for 0 ms (0 ms backoff)
+
+# Connection fails quickly.
+run
+ should connect
+connect-failed ECONNREFUSED
+ in BACKOFF for 0 ms (1000 ms backoff)
+ 0 successful connections out of 1 attempts, seqno 0
+
+# Back off for 1000 ms.
+run
+timeout
+ advance 1000 ms
+
+### t=2000 ###
+ in BACKOFF for 1000 ms (1000 ms backoff)
+
+# Connection fails quickly again.
+run
+ should connect
+connect-failed ECONNREFUSED
+ in BACKOFF for 0 ms (2000 ms backoff)
+ 0 successful connections out of 2 attempts, seqno 0
+
+# Back off for 2000 ms.
+run
+timeout
+ advance 2000 ms
+
+### t=4000 ###
+ in BACKOFF for 2000 ms (2000 ms backoff)
+])
+AT_CLEANUP
+
--- /dev/null
+/*
+ * Copyright (c) 2009 Nicira Networks.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <config.h>
+
+#include "reconnect.h"
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "command-line.h"
+#include "compiler.h"
+#include "svec.h"
+#include "util.h"
+
+static struct reconnect *reconnect;
+static int now;
+
+static const struct command commands[];
+
+static void diff_stats(const struct reconnect_stats *old,
+ const struct reconnect_stats *new);
+
+int
+main(void)
+{
+ struct reconnect_stats prev;
+ int old_time;
+ char line[128];
+
+ now = 1000;
+ reconnect = reconnect_create(now);
+ reconnect_set_name(reconnect, "remote");
+ reconnect_get_stats(reconnect, now, &prev);
+ printf("### t=%d ###\n", now);
+ old_time = now;
+ while (fgets(line, sizeof line, stdin)) {
+ struct reconnect_stats cur;
+ struct svec args;
+
+ fputs(line, stdout);
+ if (line[0] == '#') {
+ continue;
+ }
+
+ svec_init(&args);
+ svec_parse_words(&args, line);
+ svec_terminate(&args);
+ if (!svec_is_empty(&args)) {
+ run_command(args.n, args.names, commands);
+ }
+ svec_destroy(&args);
+
+ if (old_time != now) {
+ printf("\n### t=%d ###\n", now);
+ old_time = now;
+ }
+
+ reconnect_get_stats(reconnect, now, &cur);
+ diff_stats(&prev, &cur);
+ prev = cur;
+ }
+
+ return 0;
+}
+
+static void
+do_enable(int argc UNUSED, char *argv[] UNUSED)
+{
+ reconnect_enable(reconnect, now);
+}
+
+static void
+do_disable(int argc UNUSED, char *argv[] UNUSED)
+{
+ reconnect_disable(reconnect, now);
+}
+
+static void
+do_force_reconnect(int argc UNUSED, char *argv[] UNUSED)
+{
+ reconnect_force_reconnect(reconnect, now);
+}
+
+static int
+error_from_string(const char *s)
+{
+ if (!s) {
+ return 0;
+ } else if (!strcmp(s, "ECONNREFUSED")) {
+ return ECONNREFUSED;
+ } else if (!strcmp(s, "EOF")) {
+ return EOF;
+ } else {
+ ovs_fatal(0, "unknown error '%s'", s);
+ }
+}
+
+static void
+do_disconnected(int argc UNUSED, char *argv[])
+{
+ reconnect_disconnected(reconnect, now, error_from_string(argv[1]));
+}
+
+static void
+do_connecting(int argc UNUSED, char *argv[] UNUSED)
+{
+ reconnect_connecting(reconnect, now);
+}
+
+static void
+do_connect_failed(int argc UNUSED, char *argv[])
+{
+ reconnect_connect_failed(reconnect, now, error_from_string(argv[1]));
+}
+
+static void
+do_connected(int argc UNUSED, char *argv[] UNUSED)
+{
+ reconnect_connected(reconnect, now);
+}
+
+static void
+do_received(int argc UNUSED, char *argv[] UNUSED)
+{
+ reconnect_received(reconnect, now);
+}
+
+static void
+do_run(int argc, char *argv[])
+{
+ enum reconnect_action action;
+
+ if (argc > 1) {
+ now += atoi(argv[1]);
+ }
+
+ action = reconnect_run(reconnect, now);
+ switch (action) {
+ default:
+ if (action != 0) {
+ NOT_REACHED();
+ }
+ break;
+
+ case RECONNECT_CONNECT:
+ printf(" should connect\n");
+ break;
+
+ case RECONNECT_DISCONNECT:
+ printf(" should disconnect\n");
+ break;
+
+ case RECONNECT_PROBE:
+ printf(" should send probe\n");
+ break;
+ }
+}
+
+static void
+do_advance(int argc UNUSED, char *argv[])
+{
+ now += atoi(argv[1]);
+}
+
+static void
+do_timeout(int argc UNUSED, char *argv[] UNUSED)
+{
+ int timeout = reconnect_timeout(reconnect, now);
+ if (timeout >= 0) {
+ printf(" advance %d ms\n", timeout);
+ now += timeout;
+ } else {
+ printf(" no timeout\n");
+ }
+}
+
+static void
+diff_stats(const struct reconnect_stats *old,
+ const struct reconnect_stats *new)
+{
+ if (old->state != new->state
+ || old->state_elapsed != new->state_elapsed
+ || old->backoff != new->backoff) {
+ printf(" in %s for %u ms (%d ms backoff)\n",
+ new->state, new->state_elapsed, new->backoff);
+ }
+ if (old->creation_time != new->creation_time
+ || old->last_received != new->last_received
+ || old->last_connected != new->last_connected) {
+ printf(" created %lld, last received %lld, last connected %lld\n",
+ new->creation_time, new->last_received, new->last_connected);
+ }
+ if (old->n_successful_connections != new->n_successful_connections
+ || old->n_attempted_connections != new->n_attempted_connections
+ || old->seqno != new->seqno) {
+ printf(" %u successful connections out of %u attempts, seqno %u\n",
+ new->n_successful_connections, new->n_attempted_connections,
+ new->seqno);
+ }
+ if (old->is_connected != new->is_connected
+ || old->current_connection_duration != new->current_connection_duration
+ || old->total_connected_duration != new->total_connected_duration) {
+ printf(" %sconnected (%u ms), total %u ms connected\n",
+ new->is_connected ? "" : "not ",
+ new->current_connection_duration,
+ new->total_connected_duration);
+ }
+}
+
+static const struct command commands[] = {
+ { "enable", 0, 0, do_enable },
+ { "disable", 0, 0, do_disable },
+ { "force-reconnect", 0, 0, do_force_reconnect },
+ { "disconnected", 0, 1, do_disconnected },
+ { "connecting", 0, 0, do_connecting },
+ { "connect-failed", 0, 1, do_connect_failed },
+ { "connected", 0, 0, do_connected },
+ { "received", 0, 0, do_received },
+ { "run", 0, 1, do_run },
+ { "advance", 1, 1, do_advance },
+ { "timeout", 0, 0, do_timeout },
+ { NULL, 0, 0, NULL },
+};
+
m4_include([tests/jsonrpc.at])
m4_include([tests/timeval.at])
m4_include([tests/lockfile.at])
+m4_include([tests/reconnect.at])
m4_include([tests/ovsdb.at])
m4_include([tests/stp.at])
m4_include([tests/ovs-vsctl.at])
projects / openvswitch / commitdiff